/* roulang page: index */
:root {
            --bg-primary: #0A0E17;
            --bg-secondary: #111827;
            --bg-card: #1A2332;
            --bg-card-hover: #1F2D41;
            --accent-blue: #00A3FF;
            --accent-cyan: #00F0FF;
            --accent-glow: #00A3FF;
            --text-primary: #F0F4F8;
            --text-secondary: #B0C0D0;
            --text-muted: #6B7D90;
            --border-color: #2A3A4F;
            --border-glow: rgba(0, 163, 255, 0.4);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 22px;
            --radius-xl: 32px;
            --shadow-card: 0 8px 30px rgba(0, 0, 0, 0.4);
            --shadow-glow: 0 0 20px rgba(0, 163, 255, 0.25);
            --shadow-glow-hover: 0 0 35px rgba(0, 163, 255, 0.5);
            --font-sans: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
            --transition-fast: 0.2s ease;
            --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --container-max: 1280px;
            --header-height: 70px;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-sans);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.65;
            min-height: 100vh;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        a {
            color: inherit;
            text-decoration: none;
        }

        button {
            cursor: pointer;
            font-family: inherit;
            border: none;
            outline: none;
        }

        input {
            font-family: inherit;
            outline: none;
            border: none;
        }

        .container {
            max-width: var(--container-max);
            margin-left: auto;
            margin-right: auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        /* HEADER / NAVIGATION */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(10, 14, 23, 0.82);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(42, 58, 79, 0.6);
            transition: var(--transition-fast);
            height: var(--header-height);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }

        .logo {
            font-size: 1.5rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, #00F0FF 0%, #00A3FF 70%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            white-space: nowrap;
            position: relative;
        }

        .nav-list {
            display: flex;
            align-items: center;
            gap: 32px;
            list-style: none;
        }

        .nav-list a {
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--text-secondary);
            position: relative;
            padding: 8px 0;
            transition: color var(--transition-fast);
        }

        .nav-list a:hover,
        .nav-list a.active {
            color: var(--text-primary);
        }

        .nav-list a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent-cyan);
            transition: width var(--transition-smooth);
            border-radius: 2px;
        }

        .nav-list a:hover::after,
        .nav-list a.active::after {
            width: 100%;
        }

        .nav-right {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .btn-header {
            padding: 10px 22px;
            border-radius: 30px;
            font-weight: 700;
            font-size: 0.9rem;
            letter-spacing: 0.3px;
            transition: all var(--transition-fast);
        }

        .btn-login {
            background: transparent;
            color: var(--text-primary);
            border: 1px solid var(--border-color);
        }

        .btn-login:hover {
            border-color: var(--accent-cyan);
            background: rgba(0, 240, 255, 0.06);
        }

        .btn-signup {
            background: linear-gradient(135deg, #00A3FF 0%, #0066CC 100%);
            color: #ffffff;
            box-shadow: 0 4px 18px rgba(0, 163, 255, 0.35);
            border: 1px solid rgba(0, 240, 255, 0.25);
        }

        .btn-signup:hover {
            box-shadow: 0 8px 28px rgba(0, 163, 255, 0.55);
            transform: translateY(-1px);
        }

        .mobile-menu-btn {
            display: none;
            background: none;
            color: var(--text-primary);
            font-size: 1.8rem;
            line-height: 1;
            padding: 6px;
        }

        /* HERO BENTO */
        .hero-section {
            padding-top: calc(var(--header-height) + 40px);
            padding-bottom: 60px;
            background: radial-gradient(ellipse at 30% top, rgba(0, 163, 255, 0.08) 0%, transparent 55%),
                        radial-gradient(ellipse at 70% bottom, rgba(0, 240, 255, 0.06) 0%, transparent 55%);
        }

        .hero-bento {
            display: grid;
            grid-template-columns: 1.35fr 1fr;
            grid-template-rows: auto auto;
            gap: 24px;
        }

        .hero-main-card {
            grid-row: span 2;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 48px 44px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            box-shadow: var(--shadow-card);
            position: relative;
            overflow: hidden;
        }

        .hero-main-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            opacity: 0.1;
            z-index: 0;
        }

        .hero-main-card > * {
            position: relative;
            z-index: 1;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(0, 163, 255, 0.12);
            border: 1px solid rgba(0, 163, 255, 0.35);
            color: var(--accent-cyan);
            font-size: 0.85rem;
            font-weight: 700;
            padding: 6px 16px;
            border-radius: 30px;
            margin-bottom: 24px;
            width: fit-content;
        }

        .hero-badge .dot {
            width: 8px;
            height: 8px;
            background: var(--accent-cyan);
            border-radius: 50%;
            animation: pulse-dot 1.6s infinite;
        }

        @keyframes pulse-dot {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.35; }
        }

        .hero-main-card h1 {
            font-size: 2.8rem;
            font-weight: 900;
            line-height: 1.2;
            margin-bottom: 18px;
            color: #FFFFFF;
            letter-spacing: -1px;
        }

        .hero-main-card h1 span {
            color: var(--accent-cyan);
        }

        .hero-desc {
            font-size: 1.05rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 32px;
            max-width: 500px;
        }

        .hero-cta-group {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
        }

        .btn-primary {
            padding: 14px 32px;
            background: linear-gradient(135deg, #00A3FF 0%, #0066CC 100%);
            color: #fff;
            border-radius: 30px;
            font-weight: 700;
            font-size: 1rem;
            letter-spacing: 0.4px;
            border: 1px solid rgba(0, 240, 255, 0.25);
            box-shadow: 0 6px 22px rgba(0, 163, 255, 0.4);
            transition: all var(--transition-smooth);
        }

        .btn-primary:hover {
            box-shadow: 0 10px 35px rgba(0, 163, 255, 0.6);
            transform: translateY(-2px);
        }

        .btn-outline {
            padding: 14px 32px;
            background: transparent;
            color: var(--text-primary);
            border-radius: 30px;
            font-weight: 700;
            font-size: 1rem;
            border: 1px solid var(--border-color);
            transition: all var(--transition-smooth);
        }

        .btn-outline:hover {
            border-color: var(--accent-cyan);
            background: rgba(0, 240, 255, 0.04);
        }

        .hero-sub-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 28px 32px;
            box-shadow: var(--shadow-card);
            display: flex;
            align-items: center;
            gap: 20px;
            transition: border-color var(--transition-smooth);
        }

        .hero-sub-card:hover {
            border-color: rgba(0, 163, 255, 0.5);
        }

        .hero-sub-icon {
            font-size: 2.2rem;
            background: rgba(0, 163, 255, 0.1);
            width: 58px;
            height: 58px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-md);
            flex-shrink: 0;
        }

        .hero-sub-text h3 {
            font-size: 1.15rem;
            font-weight: 800;
            margin-bottom: 6px;
            color: #fff;
        }

        .hero-sub-text p {
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.5;
        }

        .hero-cta-bar {
            grid-column: 1 / -1;
            background: linear-gradient(105deg, #111827 0%, #1A2332 100%);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 24px 36px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 18px;
        }

        .hero-cta-bar p {
            font-weight: 700;
            font-size: 1.05rem;
            color: var(--text-primary);
        }

        /* SECTION STYLES */
        section {
            padding: 70px 0;
        }

        .section-label {
            font-size: 0.8rem;
            text-transform: uppercase;
            letter-spacing: 1.5px;
            color: var(--accent-cyan);
            font-weight: 700;
            margin-bottom: 12px;
        }

        .section-title {
            font-size: 2rem;
            font-weight: 900;
            letter-spacing: -0.5px;
            margin-bottom: 16px;
            color: #FFFFFF;
            line-height: 1.25;
        }

        .section-desc {
            font-size: 1rem;
            color: var(--text-secondary);
            max-width: 650px;
            margin-bottom: 40px;
            line-height: 1.7;
        }

        /* COURSE MATRIX / DANH MỤC */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 22px;
        }

        .category-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 32px 24px;
            text-align: left;
            box-shadow: var(--shadow-card);
            transition: all var(--transition-smooth);
            cursor: pointer;
            position: relative;
            overflow: hidden;
        }

        .category-card:hover {
            border-color: rgba(0, 163, 255, 0.5);
            box-shadow: 0 12px 35px rgba(0, 163, 255, 0.2);
            transform: translateY(-4px);
        }

        .category-card .card-icon {
            font-size: 2.4rem;
            margin-bottom: 18px;
            color: var(--accent-cyan);
        }

        .category-card h3 {
            font-size: 1.2rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 10px;
        }

        .category-card p {
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.55;
        }

        /* PREVIEW / THỬ NGHIỆM */
        .preview-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }

        .preview-img {
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-card);
        }

        .preview-content h3 {
            font-size: 1.7rem;
            font-weight: 900;
            margin-bottom: 16px;
            color: #fff;
        }

        .preview-content p {
            color: var(--text-secondary);
            margin-bottom: 24px;
            line-height: 1.7;
        }

        /* SUCCESS / THỐNG KÊ */
        .stats-row {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 22px;
        }

        .stat-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 30px 24px;
            text-align: center;
            box-shadow: var(--shadow-card);
        }

        .stat-number {
            font-size: 2.2rem;
            font-weight: 900;
            background: linear-gradient(135deg, #00F0FF, #00A3FF);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 8px;
        }

        .stat-label {
            font-size: 0.95rem;
            color: var(--text-secondary);
            font-weight: 600;
        }

        /* NEWS LIST */
        .news-layout {
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: 32px;
            align-items: start;
        }

        .news-main-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .news-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 20px 24px;
            transition: all var(--transition-fast);
            display: flex;
            align-items: center;
            gap: 18px;
        }

        .news-item:hover {
            border-color: rgba(0, 163, 255, 0.5);
            background: var(--bg-card-hover);
        }

        .news-item .news-icon {
            font-size: 1.8rem;
            color: var(--accent-cyan);
            flex-shrink: 0;
        }

        .news-item .news-info h4 {
            font-size: 1.05rem;
            font-weight: 800;
            margin-bottom: 6px;
            color: #fff;
        }

        .news-item .news-info p {
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        .news-sidebar {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            box-shadow: var(--shadow-card);
        }

        .news-sidebar h3 {
            font-size: 1.2rem;
            font-weight: 800;
            margin-bottom: 18px;
            color: #fff;
        }

        .news-sidebar ul {
            list-style: none;
        }

        .news-sidebar li {
            padding: 10px 0;
            border-bottom: 1px solid rgba(42, 58, 79, 0.5);
            font-size: 0.95rem;
            color: var(--text-secondary);
            transition: color var(--transition-fast);
            cursor: pointer;
        }

        .news-sidebar li:hover {
            color: var(--accent-cyan);
        }

        /* AGENDA TIMELINE */
        .timeline-list {
            display: flex;
            flex-direction: column;
            gap: 28px;
            position: relative;
            padding-left: 40px;
        }

        .timeline-list::before {
            content: '';
            position: absolute;
            left: 18px;
            top: 0;
            bottom: 0;
            width: 2px;
            background: var(--border-color);
        }

        .timeline-item {
            position: relative;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 22px 28px;
            box-shadow: var(--shadow-card);
            transition: border-color var(--transition-smooth);
        }

        .timeline-item:hover {
            border-color: rgba(0, 163, 255, 0.5);
        }

        .timeline-item::before {
            content: '';
            position: absolute;
            left: -30px;
            top: 26px;
            width: 12px;
            height: 12px;
            background: var(--accent-cyan);
            border-radius: 50%;
            box-shadow: 0 0 12px rgba(0, 240, 255, 0.5);
        }

        .timeline-item .time {
            font-size: 0.8rem;
            color: var(--accent-cyan);
            font-weight: 700;
            margin-bottom: 8px;
        }

        .timeline-item h4 {
            font-weight: 800;
            color: #fff;
            margin-bottom: 6px;
            font-size: 1.1rem;
        }

        .timeline-item p {
            color: var(--text-secondary);
            font-size: 0.9rem;
        }

        /* MEDIA SCROLL */
        .media-scroll {
            display: flex;
            gap: 20px;
            overflow-x: auto;
            padding-bottom: 16px;
            scroll-snap-type: x mandatory;
        }

        .media-scroll::-webkit-scrollbar {
            height: 5px;
        }

        .media-scroll::-webkit-scrollbar-thumb {
            background: var(--border-color);
            border-radius: 6px;
        }

        .media-card {
            min-width: 260px;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            overflow: hidden;
            scroll-snap-align: start;
            flex-shrink: 0;
            transition: all var(--transition-smooth);
        }

        .media-card:hover {
            border-color: rgba(0, 163, 255, 0.5);
            transform: translateY(-4px);
        }

        .media-card img {
            width: 100%;
            height: 150px;
            object-fit: cover;
        }

        .media-card-body {
            padding: 18px;
        }

        .media-card-body h4 {
            font-weight: 800;
            font-size: 1rem;
            color: #fff;
            margin-bottom: 6px;
        }

        .media-card-body p {
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        /* CTA BANNER */
        .cta-banner {
            background: linear-gradient(135deg, #0A1F35 0%, #0D2B45 100%);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-xl);
            padding: 56px 48px;
            text-align: center;
            box-shadow: var(--shadow-glow);
        }

        .cta-banner h2 {
            font-size: 2rem;
            font-weight: 900;
            color: #fff;
            margin-bottom: 16px;
        }

        .cta-banner p {
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto 30px auto;
            font-size: 1.05rem;
        }

        /* FAQ */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
            max-width: 850px;
        }

        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: border-color var(--transition-fast);
        }

        .faq-item:hover {
            border-color: rgba(0, 163, 255, 0.5);
        }

        .faq-question {
            width: 100%;
            background: none;
            color: #fff;
            font-weight: 800;
            font-size: 1.05rem;
            padding: 22px 28px;
            text-align: left;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .faq-answer {
            padding: 0 28px 24px 28px;
            color: var(--text-secondary);
            line-height: 1.7;
            font-size: 0.95rem;
        }

        /* FAB */
        .fab-left {
            position: fixed;
            left: 20px;
            bottom: 100px;
            z-index: 999;
        }

        .fab-btn {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: rgba(17, 24, 39, 0.85);
            backdrop-filter: blur(14px);
            border: 2px solid transparent;
            background-clip: padding-box;
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 0 25px rgba(0, 163, 255, 0.45);
            color: #00F0FF;
            font-size: 1.6rem;
            transition: all var(--transition-smooth);
            cursor: pointer;
        }

        .fab-btn::before {
            content: '';
            position: absolute;
            inset: -2px;
            border-radius: 50%;
            background: linear-gradient(135deg, #00F0FF, #00A3FF);
            z-index: -1;
            mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
            mask-composite: exclude;
            padding: 2px;
        }

        .fab-btn:hover {
            box-shadow: 0 0 45px rgba(0, 163, 255, 0.7);
            transform: scale(1.08);
        }

        .fab-notification {
            position: absolute;
            top: -2px;
            right: -2px;
            width: 14px;
            height: 14px;
            background: #FF3B3B;
            border-radius: 50%;
            border: 2px solid var(--bg-primary);
            animation: pulse-dot 1.2s infinite;
        }

        /* FOOTER */
        .footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            padding: 48px 0 28px;
            color: var(--text-muted);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 30px;
        }

        .footer-col h4 {
            color: #fff;
            font-weight: 800;
            margin-bottom: 16px;
            font-size: 1rem;
        }

        .footer-col a {
            display: block;
            color: var(--text-secondary);
            font-size: 0.9rem;
            margin-bottom: 10px;
            transition: color var(--transition-fast);
        }

        .footer-col a:hover {
            color: var(--accent-cyan);
        }

        .footer-bottom {
            margin-top: 36px;
            padding-top: 22px;
            border-top: 1px solid rgba(42, 58, 79, 0.5);
            text-align: center;
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        /* RESPONSIVE */
        @media (max-width: 1024px) {
            .hero-bento {
                grid-template-columns: 1fr;
            }
            .hero-main-card {
                grid-row: auto;
            }
            .category-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .news-layout {
                grid-template-columns: 1fr;
            }
            .stats-row {
                grid-template-columns: repeat(2, 1fr);
            }
            .preview-block {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .nav-list {
                display: none;
            }
            .mobile-menu-btn {
                display: block;
            }
        }

        @media (max-width: 768px) {
            .hero-main-card {
                padding: 32px 24px;
            }
            .hero-main-card h1 {
                font-size: 2rem;
            }
            .section-title {
                font-size: 1.6rem;
            }
            .category-grid {
                grid-template-columns: 1fr;
            }
            .stats-row {
                grid-template-columns: 1fr 1fr;
            }
            .hero-cta-bar {
                flex-direction: column;
                text-align: center;
            }
        }

        @media (max-width: 520px) {
            .stats-row {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .btn-primary, .btn-outline {
                width: 100%;
                text-align: center;
            }
            .hero-cta-group {
                flex-direction: column;
            }
        }

/* roulang page: article */
:root {
            --bg-primary: #0A0E17;
            --bg-secondary: #111827;
            --bg-card: #1A2332;
            --bg-card-hover: #1F2D41;
            --accent-blue: #00A3FF;
            --accent-cyan: #00F0FF;
            --accent-glow: #00A3FF;
            --text-primary: #F0F4F8;
            --text-secondary: #B0C0D0;
            --text-muted: #6B7D90;
            --border-color: #2A3A4F;
            --border-glow: rgba(0, 163, 255, 0.4);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 22px;
            --radius-xl: 32px;
            --shadow-card: 0 8px 30px rgba(0, 0, 0, 0.4);
            --shadow-glow: 0 0 20px rgba(0, 163, 255, 0.25);
            --shadow-glow-hover: 0 0 35px rgba(0, 163, 255, 0.5);
            --font-sans: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
            --transition-fast: 0.2s ease;
            --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --container-max: 1280px;
            --header-height: 70px;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-sans);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.65;
            min-height: 100vh;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        a {
            color: inherit;
            text-decoration: none;
        }

        button {
            cursor: pointer;
            font-family: inherit;
            border: none;
            outline: none;
        }

        input {
            font-family: inherit;
            outline: none;
            border: none;
        }

        .container {
            max-width: var(--container-max);
            margin-left: auto;
            margin-right: auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        /* HEADER / NAVIGATION */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(10, 14, 23, 0.82);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(42, 58, 79, 0.6);
            transition: var(--transition-fast);
            height: var(--header-height);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }

        .logo {
            font-size: 1.5rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, #00F0FF 0%, #00A3FF 70%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            white-space: nowrap;
            position: relative;
        }

        .nav-list {
            display: flex;
            align-items: center;
            gap: 32px;
            list-style: none;
        }

        .nav-list a {
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--text-secondary);
            position: relative;
            padding: 8px 0;
            transition: color var(--transition-fast);
        }

        .nav-list a:hover,
        .nav-list a.active {
            color: var(--text-primary);
        }

        .nav-list a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent-cyan);
            transition: width var(--transition-smooth);
            border-radius: 2px;
        }

        .nav-list a:hover::after,
        .nav-list a.active::after {
            width: 100%;
        }

        .nav-right {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .btn-header {
            padding: 10px 22px;
            border-radius: 30px;
            font-weight: 700;
            font-size: 0.9rem;
            letter-spacing: 0.3px;
            transition: all var(--transition-fast);
        }

        .btn-login {
            background: transparent;
            color: var(--text-primary);
            border: 1px solid var(--border-color);
        }

        .btn-login:hover {
            border-color: var(--accent-cyan);
            background: rgba(0, 240, 255, 0.06);
        }

        .btn-signup {
            background: linear-gradient(135deg, #00A3FF 0%, #0066CC 100%);
            color: #ffffff;
            box-shadow: 0 4px 18px rgba(0, 163, 255, 0.35);
            border: 1px solid rgba(0, 240, 255, 0.25);
        }

        .btn-signup:hover {
            box-shadow: 0 8px 28px rgba(0, 163, 255, 0.55);
            transform: translateY(-1px);
        }

        .mobile-menu-btn {
            display: none;
            background: none;
            color: var(--text-primary);
            font-size: 1.8rem;
            line-height: 1;
            padding: 6px;
        }

        /* ARTICLE CONTENT */
        .article-page {
            padding-top: calc(var(--header-height) + 32px);
            padding-bottom: 80px;
            background: radial-gradient(ellipse at 30% top, rgba(0, 163, 255, 0.07) 0%, transparent 60%),
                        radial-gradient(ellipse at 80% bottom, rgba(0, 240, 255, 0.04) 0%, transparent 55%);
        }

        .article-container {
            max-width: 860px;
            margin: 0 auto;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 48px 52px;
            box-shadow: var(--shadow-card);
            backdrop-filter: blur(10px);
        }

        .article-header-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-wrap: wrap;
            margin-bottom: 24px;
            color: var(--text-muted);
            font-size: 0.9rem;
            font-weight: 500;
        }

        .article-category-badge {
            display: inline-block;
            background: rgba(0, 163, 255, 0.15);
            color: var(--accent-cyan);
            padding: 6px 16px;
            border-radius: 30px;
            font-weight: 700;
            font-size: 0.85rem;
            letter-spacing: 0.4px;
            border: 1px solid rgba(0, 240, 255, 0.3);
            transition: var(--transition-fast);
        }

        .article-category-badge:hover {
            background: rgba(0, 163, 255, 0.25);
            box-shadow: var(--shadow-glow);
        }

        .article-date {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .article-date::before {
            content: '📅';
            font-size: 0.9rem;
        }

        .article-featured-image {
            width: 100%;
            border-radius: var(--radius-md);
            margin-bottom: 32px;
            overflow: hidden;
            box-shadow: var(--shadow-glow);
        }

        .article-featured-image img {
            width: 100%;
            height: auto;
            object-fit: cover;
            border-radius: var(--radius-md);
            transition: transform var(--transition-smooth);
        }

        .article-featured-image img:hover {
            transform: scale(1.01);
        }

        .article-body h1 {
            font-size: 2.4rem;
            font-weight: 800;
            line-height: 1.3;
            margin-bottom: 20px;
            color: var(--text-primary);
            letter-spacing: -0.5px;
        }

        .article-body h2 {
            font-size: 1.7rem;
            font-weight: 700;
            margin-top: 40px;
            margin-bottom: 16px;
            color: var(--text-primary);
            padding-bottom: 10px;
            border-bottom: 2px solid var(--border-glow);
        }

        .article-body h3 {
            font-size: 1.35rem;
            font-weight: 700;
            margin-top: 28px;
            margin-bottom: 12px;
            color: var(--accent-cyan);
        }

        .article-body p {
            color: var(--text-secondary);
            margin-bottom: 18px;
            font-size: 1.05rem;
            line-height: 1.7;
            text-align: left;
        }

        .article-body ul,
        .article-body ol {
            margin-bottom: 24px;
            padding-left: 28px;
            color: var(--text-secondary);
        }

        .article-body li {
            margin-bottom: 10px;
            font-size: 1rem;
            line-height: 1.6;
        }

        .article-body a {
            color: var(--accent-cyan);
            font-weight: 600;
            text-decoration: underline;
            text-underline-offset: 4px;
            transition: color var(--transition-fast);
        }

        .article-body a:hover {
            color: #00F0FF;
            text-decoration: none;
        }

        .article-body blockquote {
            border-left: 4px solid var(--accent-cyan);
            background: rgba(0, 163, 255, 0.05);
            padding: 16px 24px;
            margin: 28px 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-secondary);
            font-style: italic;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
        }

        .article-not-found {
            text-align: center;
            padding: 80px 20px;
        }

        .article-not-found h2 {
            font-size: 2rem;
            margin-bottom: 16px;
            color: var(--text-primary);
        }

        .article-not-found p {
            color: var(--text-muted);
            margin-bottom: 28px;
            font-size: 1.1rem;
        }

        .btn-back-home {
            display: inline-block;
            background: linear-gradient(135deg, #00A3FF 0%, #0066CC 100%);
            color: #ffffff;
            padding: 14px 32px;
            border-radius: 30px;
            font-weight: 700;
            font-size: 1rem;
            box-shadow: 0 6px 22px rgba(0, 163, 255, 0.4);
            transition: all var(--transition-smooth);
        }

        .btn-back-home:hover {
            box-shadow: 0 10px 28px rgba(0, 163, 255, 0.65);
            transform: translateY(-2px);
        }

        /* Share Buttons */
        .article-share {
            display: flex;
            align-items: center;
            gap: 16px;
            margin-top: 48px;
            padding-top: 28px;
            border-top: 1px solid var(--border-color);
            flex-wrap: wrap;
        }

        .share-label {
            font-weight: 700;
            font-size: 1rem;
            color: var(--text-primary);
        }

        .share-btn {
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            padding: 10px 20px;
            border-radius: 30px;
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--text-secondary);
            transition: all var(--transition-fast);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .share-btn:hover {
            border-color: var(--accent-cyan);
            background: rgba(0, 240, 255, 0.06);
            color: var(--text-primary);
        }

        /* FAB */
        .fab-support {
            position: fixed;
            left: 20px;
            bottom: 100px;
            z-index: 50;
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: rgba(10, 14, 23, 0.7);
            backdrop-filter: blur(12px);
            border: 2px solid transparent;
            background-clip: padding-box;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            box-shadow: 0 0 18px rgba(0, 240, 255, 0.5);
            transition: all var(--transition-smooth);
            cursor: pointer;
            color: var(--accent-cyan);
        }

        .fab-support:hover {
            transform: scale(1.1);
            box-shadow: 0 0 30px rgba(0, 240, 255, 0.8);
            background: rgba(0, 163, 255, 0.2);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .article-container {
                padding: 36px 28px;
            }
            .article-body h1 {
                font-size: 2rem;
            }
            .article-body h2 {
                font-size: 1.5rem;
            }
        }

        @media (max-width: 768px) {
            .nav-list {
                display: none;
                position: absolute;
                top: var(--header-height);
                left: 0;
                width: 100%;
                background: rgba(10, 14, 23, 0.95);
                backdrop-filter: blur(20px);
                flex-direction: column;
                gap: 20px;
                padding: 24px;
                border-bottom: 1px solid var(--border-color);
            }
            .nav-list.active {
                display: flex;
            }
            .mobile-menu-btn {
                display: block;
            }
            .article-container {
                padding: 28px 20px;
                margin: 0 10px;
            }
            .article-body h1 {
                font-size: 1.8rem;
            }
            .article-body h2 {
                font-size: 1.35rem;
            }
        }

        @media (max-width: 520px) {
            .nav-right {
                gap: 10px;
            }
            .btn-header {
                padding: 8px 14px;
                font-size: 0.8rem;
            }
            .article-body h1 {
                font-size: 1.6rem;
            }
            .article-header-meta {
                font-size: 0.8rem;
                gap: 10px;
            }
        }

        /* FOOTER */
        .footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            padding: 56px 0 28px;
            margin-top: 80px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 36px;
            margin-bottom: 40px;
        }

        .footer-col h4 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--text-primary);
            letter-spacing: 0.2px;
        }

        .footer-col a {
            display: block;
            color: var(--text-muted);
            font-size: 0.95rem;
            margin-bottom: 10px;
            transition: color var(--transition-fast);
        }

        .footer-col a:hover {
            color: var(--accent-cyan);
        }

        .footer-bottom {
            border-top: 1px solid var(--border-color);
            padding-top: 24px;
            text-align: center;
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.5;
        }

        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
        }

        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
        }

/* roulang page: category1 */
:root {
            --bg-primary: #0A0E17;
            --bg-secondary: #111827;
            --bg-card: #1A2332;
            --bg-card-hover: #1F2D41;
            --accent-blue: #00A3FF;
            --accent-cyan: #00F0FF;
            --accent-glow: #00A3FF;
            --text-primary: #F0F4F8;
            --text-secondary: #B0C0D0;
            --text-muted: #6B7D90;
            --border-color: #2A3A4F;
            --border-glow: rgba(0, 163, 255, 0.4);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 22px;
            --radius-xl: 32px;
            --shadow-card: 0 8px 30px rgba(0, 0, 0, 0.4);
            --shadow-glow: 0 0 20px rgba(0, 163, 255, 0.25);
            --shadow-glow-hover: 0 0 35px rgba(0, 163, 255, 0.5);
            --font-sans: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
            --transition-fast: 0.2s ease;
            --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --container-max: 1280px;
            --header-height: 70px;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-sans);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.65;
            min-height: 100vh;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        a {
            color: inherit;
            text-decoration: none;
        }

        button {
            cursor: pointer;
            font-family: inherit;
            border: none;
            outline: none;
        }

        input {
            font-family: inherit;
            outline: none;
            border: none;
        }

        .container {
            max-width: var(--container-max);
            margin-left: auto;
            margin-right: auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        /* HEADER / NAVIGATION */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(10, 14, 23, 0.82);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(42, 58, 79, 0.6);
            transition: var(--transition-fast);
            height: var(--header-height);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }

        .logo {
            font-size: 1.5rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, #00F0FF 0%, #00A3FF 70%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            white-space: nowrap;
            position: relative;
        }

        .nav-list {
            display: flex;
            align-items: center;
            gap: 32px;
            list-style: none;
        }

        .nav-list a {
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--text-secondary);
            position: relative;
            padding: 8px 0;
            transition: color var(--transition-fast);
        }

        .nav-list a:hover,
        .nav-list a.active {
            color: var(--text-primary);
        }

        .nav-list a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent-cyan);
            transition: width var(--transition-smooth);
            border-radius: 2px;
        }

        .nav-list a:hover::after,
        .nav-list a.active::after {
            width: 100%;
        }

        .nav-right {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .btn-header {
            padding: 10px 22px;
            border-radius: 30px;
            font-weight: 700;
            font-size: 0.9rem;
            letter-spacing: 0.3px;
            transition: all var(--transition-fast);
        }

        .btn-login {
            background: transparent;
            color: var(--text-primary);
            border: 1px solid var(--border-color);
        }

        .btn-login:hover {
            border-color: var(--accent-cyan);
            background: rgba(0, 240, 255, 0.06);
        }

        .btn-signup {
            background: linear-gradient(135deg, #00A3FF 0%, #0066CC 100%);
            color: #ffffff;
            box-shadow: 0 4px 18px rgba(0, 163, 255, 0.35);
            border: 1px solid rgba(0, 240, 255, 0.25);
        }

        .btn-signup:hover {
            box-shadow: 0 8px 28px rgba(0, 163, 255, 0.55);
            transform: translateY(-1px);
        }

        .mobile-menu-btn {
            display: none;
            background: none;
            color: var(--text-primary);
            font-size: 1.8rem;
            line-height: 1;
            padding: 6px;
        }

        /* PAGE BANNER */
        .page-banner {
            padding-top: calc(var(--header-height) + 50px);
            padding-bottom: 50px;
            background: radial-gradient(ellipse at 40% top, rgba(0, 163, 255, 0.12) 0%, transparent 60%),
                        radial-gradient(ellipse at 80% bottom, rgba(0, 240, 255, 0.08) 0%, transparent 60%),
                        linear-gradient(180deg, #0D1525 0%, var(--bg-primary) 100%);
            text-align: left;
        }

        .page-banner .container {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 40px;
            align-items: center;
        }

        .banner-content h1 {
            font-size: 2.5rem;
            font-weight: 800;
            line-height: 1.3;
            margin-bottom: 18px;
            background: linear-gradient(135deg, #FFFFFF 20%, #B0E0FF 80%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .banner-content .subtitle {
            font-size: 1.15rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 22px;
            max-width: 580px;
        }

        .banner-visual {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            position: relative;
        }

        .banner-visual img {
            width: 100%;
            height: 280px;
            object-fit: cover;
            display: block;
        }

        .banner-badge {
            position: absolute;
            top: 16px;
            right: 16px;
            background: linear-gradient(135deg, #FFA800 0%, #FF6B00 100%);
            color: #000;
            font-weight: 800;
            font-size: 0.75rem;
            padding: 6px 14px;
            border-radius: 20px;
            letter-spacing: 0.5px;
            text-transform: uppercase;
            box-shadow: 0 4px 12px rgba(255, 168, 0, 0.3);
        }

        /* SECTION */
        .section {
            padding: 70px 0;
        }

        .section-header {
            margin-bottom: 40px;
            max-width: 700px;
        }

        .section-label {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 2px;
            color: var(--accent-cyan);
            margin-bottom: 12px;
        }

        .section-header h2 {
            font-size: 1.9rem;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text-primary);
            line-height: 1.3;
        }

        .section-header p {
            font-size: 1.05rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* STRATEGY GRID (ASYMMETRIC) */
        .strategy-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }

        .strategy-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            transition: all var(--transition-smooth);
            position: relative;
            overflow: hidden;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .strategy-card:hover {
            background: var(--bg-card-hover);
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow);
            transform: translateY(-3px);
        }

        .strategy-card.featured {
            grid-column: span 2;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
            align-items: center;
            padding: 0;
            overflow: hidden;
        }

        .strategy-card.featured .card-text {
            padding: 36px 32px;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .strategy-card.featured .card-image {
            height: 100%;
            min-height: 260px;
        }

        .strategy-card.featured .card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
            border-left: 1px solid var(--border-color);
        }

        .card-icon {
            width: 48px;
            height: 48px;
            border-radius: var(--radius-md);
            background: rgba(0, 163, 255, 0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: var(--accent-cyan);
            border: 1px solid rgba(0, 163, 255, 0.2);
            flex-shrink: 0;
        }

        .strategy-card h3 {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--text-primary);
        }

        .strategy-card p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.65;
        }

        .tip-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--accent-cyan);
            background: rgba(0, 240, 255, 0.08);
            padding: 6px 14px;
            border-radius: 20px;
            width: fit-content;
        }

        /* LEVELS / STEPS */
        .levels-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .level-item {
            display: flex;
            gap: 20px;
            padding: 20px 24px;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            transition: all var(--transition-fast);
        }

        .level-item:hover {
            border-color: var(--accent-blue);
            background: var(--bg-card-hover);
        }

        .level-number {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: linear-gradient(135deg, #00A3FF 0%, #0066CC 100%);
            color: #fff;
            font-weight: 800;
            font-size: 1.1rem;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            box-shadow: 0 0 16px rgba(0, 163, 255, 0.3);
        }

        .level-text h4 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 6px;
            color: var(--text-primary);
        }

        .level-text p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* QUOTE / TESTIMONIAL */
        .testimonial-block {
            background: linear-gradient(135deg, #111E30 0%, #0F1926 100%);
            border: 1px solid var(--border-color);
            border-left: 5px solid var(--accent-blue);
            border-radius: var(--radius-lg);
            padding: 36px 40px;
            position: relative;
            margin: 30px 0;
        }

        .testimonial-block blockquote {
            font-size: 1.15rem;
            font-style: italic;
            color: var(--text-secondary);
            line-height: 1.75;
            margin-bottom: 14px;
        }

        .testimonial-block .author {
            font-weight: 700;
            color: var(--accent-cyan);
            font-size: 0.95rem;
        }

        /* FAQ */
        .faq-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
        }

        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 24px;
            transition: all var(--transition-fast);
        }

        .faq-item:hover {
            border-color: var(--accent-blue);
            background: var(--bg-card-hover);
        }

        .faq-item h4 {
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-primary);
        }

        .faq-item p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.65;
        }

        /* CTA SECTION */
        .cta-section {
            padding: 80px 0;
            background: radial-gradient(ellipse at 50% 30%, rgba(0, 163, 255, 0.15) 0%, transparent 60%),
                        var(--bg-secondary);
        }

        .cta-card {
            background: var(--bg-card);
            border: 1px solid var(--border-glow);
            border-radius: var(--radius-xl);
            padding: 48px;
            display: grid;
            grid-template-columns: 1.4fr 0.8fr;
            gap: 40px;
            align-items: center;
            box-shadow: var(--shadow-glow);
            position: relative;
            overflow: hidden;
        }

        .cta-card::before {
            content: '';
            position: absolute;
            top: -60px;
            right: -60px;
            width: 220px;
            height: 220px;
            background: radial-gradient(circle, rgba(0, 240, 255, 0.25) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .cta-text h2 {
            font-size: 1.8rem;
            font-weight: 800;
            margin-bottom: 14px;
            color: #fff;
        }

        .cta-text p {
            font-size: 1.05rem;
            color: var(--text-secondary);
            margin-bottom: 24px;
            line-height: 1.7;
        }

        .btn-cta-large {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 15px 36px;
            background: linear-gradient(135deg, #00A3FF 0%, #0066CC 100%);
            color: #fff;
            border-radius: 40px;
            font-weight: 700;
            font-size: 1.05rem;
            letter-spacing: 0.4px;
            box-shadow: 0 8px 26px rgba(0, 163, 255, 0.4);
            transition: all var(--transition-fast);
            border: 1px solid rgba(0, 240, 255, 0.3);
        }

        .btn-cta-large:hover {
            box-shadow: 0 14px 34px rgba(0, 163, 255, 0.6);
            transform: translateY(-2px);
            background: linear-gradient(135deg, #00B0FF 0%, #0070D6 100%);
        }

        .cta-visual img {
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-card);
        }

        /* FOOTER */
        .footer {
            background: #060B14;
            border-top: 1px solid rgba(42, 58, 79, 0.5);
            padding: 50px 0 30px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 30px;
            margin-bottom: 40px;
        }

        .footer-col h4 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 18px;
            color: var(--text-primary);
        }

        .footer-col a {
            display: block;
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-bottom: 12px;
            transition: color var(--transition-fast);
            line-height: 1.5;
        }

        .footer-col a:hover {
            color: var(--accent-cyan);
        }

        .footer-bottom {
            border-top: 1px solid var(--border-color);
            padding-top: 22px;
            text-align: center;
            font-size: 0.85rem;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* LEFT FAB */
        .fab-left {
            position: fixed;
            left: 24px;
            bottom: 96px;
            z-index: 999;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: rgba(26, 35, 50, 0.85);
            backdrop-filter: blur(12px);
            border: 2px solid transparent;
            background-clip: padding-box;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-cyan);
            font-size: 1.8rem;
            box-shadow: 0 0 18px rgba(0, 240, 255, 0.4), 0 4px 18px rgba(0, 0, 0, 0.35);
            transition: all var(--transition-smooth);
            cursor: pointer;
            animation: fabFloat 3s ease-in-out infinite;
        }

        .fab-left::before {
            content: '';
            position: absolute;
            inset: -2px;
            border-radius: 50%;
            padding: 2px;
            background: linear-gradient(135deg, #00F0FF, #0052FF);
            -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
            mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
            -webkit-mask-composite: xor;
            mask-composite: exclude;
            pointer-events: none;
        }

        .fab-left:hover {
            transform: scale(1.12);
            box-shadow: 0 0 28px rgba(0, 240, 255, 0.6);
            color: #fff;
        }

        .fab-notification {
            position: absolute;
            top: 4px;
            right: 4px;
            width: 12px;
            height: 12px;
            background: #FF007F;
            border-radius: 50%;
            border: 2px solid #0A0E17;
            animation: blink 1.2s infinite;
        }

        @keyframes fabFloat {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-6px); }
        }

        @keyframes blink {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.25; }
        }

        /* RESPONSIVE */
        @media (max-width: 1024px) {
            .nav-list { gap: 20px; }
            .strategy-card.featured {
                grid-template-columns: 1fr;
            }
            .strategy-card.featured .card-image {
                order: -1;
                min-height: 200px;
                border-radius: var(--radius-lg) var(--radius-lg) 0 0;
            }
            .strategy-card.featured .card-image img {
                border-radius: var(--radius-lg) var(--radius-lg) 0 0;
                border-left: none;
                border-bottom: 1px solid var(--border-color);
            }
            .faq-grid {
                grid-template-columns: 1fr;
            }
            .banner-content h1 { font-size: 2rem; }
        }

        @media (max-width: 768px) {
            .nav-list, .nav-right { display: none; }
            .mobile-menu-btn { display: block; }
            .header-inner { justify-content: space-between; }
            .page-banner .container {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .banner-content h1 { font-size: 1.7rem; }
            .strategy-grid { grid-template-columns: 1fr; }
            .strategy-card.featured { grid-column: span 1; }
            .cta-card { grid-template-columns: 1fr; padding: 28px; }
            .footer-grid { grid-template-columns: repeat(2, 1fr); }
            .testimonial-block { padding: 24px; }
        }

        @media (max-width: 520px) {
            .container { padding-left: 14px; padding-right: 14px; }
            .banner-content h1 { font-size: 1.45rem; }
            .section { padding: 45px 0; }
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .fab-left { left: 16px; bottom: 80px; width: 48px; height: 48px; font-size: 1.5rem; }
            .btn-cta-large { padding: 12px 28px; font-size: 0.95rem; }
        }

/* roulang page: category2 */
:root {
            --bg-primary: #0A0E17;
            --bg-secondary: #111827;
            --bg-card: #1A2332;
            --bg-card-hover: #1F2D41;
            --accent-blue: #00A3FF;
            --accent-cyan: #00F0FF;
            --accent-glow: #00A3FF;
            --text-primary: #F0F4F8;
            --text-secondary: #B0C0D0;
            --text-muted: #6B7D90;
            --border-color: #2A3A4F;
            --border-glow: rgba(0, 163, 255, 0.4);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 22px;
            --radius-xl: 32px;
            --shadow-card: 0 8px 30px rgba(0, 0, 0, 0.4);
            --shadow-glow: 0 0 20px rgba(0, 163, 255, 0.25);
            --shadow-glow-hover: 0 0 35px rgba(0, 163, 255, 0.5);
            --font-sans: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
            --transition-fast: 0.2s ease;
            --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --container-max: 1280px;
            --header-height: 70px;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-sans);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.65;
            min-height: 100vh;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        a {
            color: inherit;
            text-decoration: none;
        }

        button {
            cursor: pointer;
            font-family: inherit;
            border: none;
            outline: none;
        }

        input {
            font-family: inherit;
            outline: none;
            border: none;
        }

        .container {
            max-width: var(--container-max);
            margin-left: auto;
            margin-right: auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        /* HEADER / NAVIGATION */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(10, 14, 23, 0.82);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(42, 58, 79, 0.6);
            transition: var(--transition-fast);
            height: var(--header-height);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }

        .logo {
            font-size: 1.5rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, #00F0FF 0%, #00A3FF 70%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            white-space: nowrap;
            position: relative;
        }

        .nav-list {
            display: flex;
            align-items: center;
            gap: 32px;
            list-style: none;
        }

        .nav-list a {
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--text-secondary);
            position: relative;
            padding: 8px 0;
            transition: color var(--transition-fast);
        }

        .nav-list a:hover,
        .nav-list a.active {
            color: var(--text-primary);
        }

        .nav-list a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent-cyan);
            transition: width var(--transition-smooth);
            border-radius: 2px;
        }

        .nav-list a:hover::after,
        .nav-list a.active::after {
            width: 100%;
        }

        .nav-right {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .btn-header {
            padding: 10px 22px;
            border-radius: 30px;
            font-weight: 700;
            font-size: 0.9rem;
            letter-spacing: 0.3px;
            transition: all var(--transition-fast);
        }

        .btn-login {
            background: transparent;
            color: var(--text-primary);
            border: 1px solid var(--border-color);
        }

        .btn-login:hover {
            border-color: var(--accent-cyan);
            background: rgba(0, 240, 255, 0.06);
        }

        .btn-signup {
            background: linear-gradient(135deg, #00A3FF 0%, #0066CC 100%);
            color: #ffffff;
            box-shadow: 0 4px 18px rgba(0, 163, 255, 0.35);
            border: 1px solid rgba(0, 240, 255, 0.25);
        }

        .btn-signup:hover {
            box-shadow: 0 8px 28px rgba(0, 163, 255, 0.55);
            transform: translateY(-1px);
        }

        .mobile-menu-btn {
            display: none;
            background: none;
            color: var(--text-primary);
            font-size: 1.8rem;
            line-height: 1;
            padding: 6px;
        }

        /* PAGE HERO (Category Banner) */
        .page-hero {
            padding-top: calc(var(--header-height) + 50px);
            padding-bottom: 60px;
            background: radial-gradient(ellipse at 40% top, rgba(0, 163, 255, 0.1) 0%, transparent 60%),
                        radial-gradient(ellipse at 70% bottom, rgba(0, 240, 255, 0.07) 0%, transparent 55%),
                        linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
            position: relative;
            overflow: hidden;
        }

        .page-hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: radial-gradient(circle at 30% 20%, rgba(0, 163, 255, 0.05) 0%, transparent 50%);
            pointer-events: none;
        }

        .page-hero-content {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }

        .page-hero-text {
            text-align: left;
        }

        .page-hero-badge {
            display: inline-block;
            padding: 6px 16px;
            background: rgba(0, 163, 255, 0.15);
            border: 1px solid var(--border-glow);
            border-radius: 30px;
            font-size: 0.85rem;
            font-weight: 700;
            color: var(--accent-cyan);
            margin-bottom: 20px;
            letter-spacing: 0.5px;
        }

        .page-hero-text h1 {
            font-size: 2.8rem;
            font-weight: 800;
            line-height: 1.25;
            margin-bottom: 18px;
            background: linear-gradient(135deg, #FFFFFF 0%, #B0C0D0 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .page-hero-text p {
            font-size: 1.1rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 32px;
            max-width: 540px;
        }

        .hero-stats-row {
            display: flex;
            gap: 32px;
            margin-bottom: 34px;
        }

        .hero-stat-item {
            display: flex;
            flex-direction: column;
        }

        .hero-stat-number {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--accent-cyan);
            letter-spacing: -0.5px;
        }

        .hero-stat-label {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-top: 4px;
        }

        .page-hero-visual {
            position: relative;
            z-index: 2;
        }

        .hero-visual-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card), 0 0 40px rgba(0, 163, 255, 0.12);
            position: relative;
        }

        .hero-visual-card img {
            width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-lg) var(--radius-lg) 0 0;
        }

        .hero-visual-card-badge {
            position: absolute;
            top: 16px;
            right: 16px;
            background: rgba(10, 14, 23, 0.9);
            backdrop-filter: blur(8px);
            border: 1px solid var(--accent-cyan);
            color: var(--accent-cyan);
            padding: 6px 14px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 700;
            letter-spacing: 0.5px;
            z-index: 3;
        }

        /* MAIN CONTENT WRAPPER */
        .main-content {
            padding: 80px 0;
            background: var(--bg-primary);
        }

        /* STRATEGY SECTION */
        .strategy-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 32px;
            margin-bottom: 60px;
        }

        .strategy-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 36px 32px;
            transition: all var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }

        .strategy-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: linear-gradient(90deg, var(--accent-blue), var(--accent-cyan));
            opacity: 0;
            transition: opacity var(--transition-smooth);
        }

        .strategy-card:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow);
            transform: translateY(-4px);
            background: var(--bg-card-hover);
        }

        .strategy-card:hover::before {
            opacity: 1;
        }

        .strategy-card-icon {
            font-size: 2.4rem;
            margin-bottom: 18px;
            display: block;
        }

        .strategy-card h3 {
            font-size: 1.4rem;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text-primary);
        }

        .strategy-card p {
            color: var(--text-secondary);
            line-height: 1.7;
            font-size: 0.95rem;
            margin-bottom: 16px;
        }

        .strategy-card-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .tag {
            display: inline-block;
            padding: 4px 12px;
            background: rgba(0, 163, 255, 0.1);
            border: 1px solid rgba(0, 163, 255, 0.2);
            border-radius: 16px;
            font-size: 0.78rem;
            font-weight: 600;
            color: var(--accent-cyan);
            transition: all var(--transition-fast);
        }

        .tag:hover {
            background: rgba(0, 163, 255, 0.2);
            border-color: var(--accent-cyan);
        }

        /* SECTION HEADING */
        .section-heading {
            margin-bottom: 48px;
        }

        .section-heading h2 {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 12px;
            letter-spacing: -0.5px;
        }

        .section-heading p {
            color: var(--text-muted);
            font-size: 1rem;
            max-width: 700px;
            line-height: 1.6;
        }

        /* TIPS ACCORDION / LIST */
        .tips-list {
            display: flex;
            flex-direction: column;
            gap: 20px;
            margin-bottom: 70px;
        }

        .tip-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 28px 32px;
            transition: all var(--transition-smooth);
            cursor: pointer;
        }

        .tip-item:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow);
            background: var(--bg-card-hover);
        }

        .tip-header {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .tip-number {
            flex-shrink: 0;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: linear-gradient(135deg, #00A3FF, #0066CC);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 1.1rem;
            color: #fff;
            box-shadow: 0 0 16px rgba(0, 163, 255, 0.3);
        }

        .tip-header h4 {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-primary);
            margin: 0;
        }

        .tip-body {
            margin-top: 16px;
            padding-left: 60px;
            color: var(--text-secondary);
            line-height: 1.7;
            font-size: 0.95rem;
        }

        /* HOW IT WORKS SECTION */
        .how-it-works {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
            margin-bottom: 70px;
        }

        .step-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 40px 30px;
            text-align: center;
            position: relative;
            transition: all var(--transition-smooth);
        }

        .step-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-glow);
            border-color: var(--border-glow);
        }

        .step-number-circle {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: rgba(0, 163, 255, 0.12);
            border: 2px solid var(--accent-cyan);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            font-size: 1.4rem;
            font-weight: 800;
            color: var(--accent-cyan);
            transition: all var(--transition-smooth);
        }

        .step-card:hover .step-number-circle {
            background: rgba(0, 163, 255, 0.25);
            box-shadow: 0 0 22px rgba(0, 163, 255, 0.4);
        }

        .step-card h4 {
            font-weight: 700;
            font-size: 1.1rem;
            margin-bottom: 10px;
        }

        .step-card p {
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.6;
        }

        /* CTA SECTION */
        .cta-section {
            background: linear-gradient(135deg, #111827 0%, #1A2332 100%);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-xl);
            padding: 60px 48px;
            text-align: center;
            margin-bottom: 60px;
            position: relative;
            overflow: hidden;
            box-shadow: var(--shadow-glow);
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle at center, rgba(0, 163, 255, 0.05) 0%, transparent 70%);
            pointer-events: none;
        }

        .cta-section h3 {
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: 16px;
            position: relative;
            z-index: 2;
        }

        .cta-section p {
            color: var(--text-secondary);
            margin-bottom: 32px;
            font-size: 1.05rem;
            position: relative;
            z-index: 2;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }

        .btn-cta-large {
            display: inline-block;
            padding: 16px 44px;
            background: linear-gradient(135deg, #00A3FF 0%, #0066CC 100%);
            color: #ffffff;
            border-radius: 40px;
            font-weight: 800;
            font-size: 1rem;
            letter-spacing: 0.5px;
            box-shadow: 0 8px 30px rgba(0, 163, 255, 0.5);
            transition: all var(--transition-smooth);
            border: 1px solid rgba(0, 240, 255, 0.3);
            position: relative;
            z-index: 2;
        }

        .btn-cta-large:hover {
            box-shadow: 0 14px 40px rgba(0, 163, 255, 0.7);
            transform: translateY(-2px);
        }

        /* FAQ */
        .faq-section {
            margin-bottom: 60px;
        }

        .faq-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }

        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 24px;
            transition: all var(--transition-smooth);
        }

        .faq-item:hover {
            border-color: var(--border-glow);
        }

        .faq-item h5 {
            font-weight: 700;
            font-size: 1rem;
            margin-bottom: 10px;
            color: var(--text-primary);
        }

        .faq-item p {
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.6;
        }

        /* FOOTER */
        .footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            padding: 60px 0 30px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-col h4 {
            font-weight: 700;
            margin-bottom: 18px;
            font-size: 1rem;
            color: var(--text-primary);
        }

        .footer-col a {
            display: block;
            color: var(--text-muted);
            font-size: 0.9rem;
            margin-bottom: 10px;
            transition: color var(--transition-fast);
        }

        .footer-col a:hover {
            color: var(--accent-cyan);
        }

        .footer-bottom {
            border-top: 1px solid var(--border-color);
            padding-top: 24px;
            text-align: center;
            color: var(--text-muted);
            font-size: 0.85rem;
        }

        /* FAB */
        .fab {
            position: fixed;
            left: 24px;
            bottom: 96px;
            width: 52px;
            height: 52px;
            border-radius: 50px;
            background: rgba(10, 14, 23, 0.7);
            backdrop-filter: blur(14px);
            border: 2px solid transparent;
            background-clip: padding-box;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            color: var(--accent-cyan);
            cursor: pointer;
            z-index: 999;
            transition: all var(--transition-smooth);
            box-shadow: 0 0 18px rgba(0, 240, 255, 0.3);
            background-image: linear-gradient(var(--bg-card), var(--bg-card)), linear-gradient(135deg, #00A3FF, #00F0FF);
            background-origin: border-box;
            background-clip: padding-box, border-box;
            animation: floatPulse 3s ease-in-out infinite;
        }

        .fab:hover {
            transform: scale(1.12);
            box-shadow: 0 0 30px rgba(0, 240, 255, 0.6);
        }

        @keyframes floatPulse {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-6px); }
        }

        /* RESPONSIVE */
        @media (max-width: 1024px) {
            .page-hero-content {
                grid-template-columns: 1fr;
                gap: 36px;
            }
            .strategy-grid {
                grid-template-columns: 1fr;
            }
            .how-it-works {
                grid-template-columns: repeat(2, 1fr);
            }
            .faq-grid {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 768px) {
            .nav-list {
                display: none;
                flex-direction: column;
                position: absolute;
                top: var(--header-height);
                left: 0;
                width: 100%;
                background: var(--bg-secondary);
                padding: 24px;
                gap: 18px;
                border-bottom: 1px solid var(--border-color);
            }
            .nav-list.mobile-open {
                display: flex;
            }
            .mobile-menu-btn {
                display: block;
            }
            .nav-right {
                gap: 10px;
            }
            .btn-header {
                padding: 8px 14px;
                font-size: 0.8rem;
            }
            .page-hero-text h1 {
                font-size: 2rem;
            }
            .hero-stats-row {
                gap: 20px;
            }
            .how-it-works {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .cta-section {
                padding: 40px 24px;
            }
            .tip-body {
                padding-left: 0;
            }
        }

        @media (max-width: 520px) {
            .page-hero-text h1 {
                font-size: 1.6rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .strategy-card {
                padding: 24px 20px;
            }
        }

/* roulang page: category3 */
:root {
            --bg-primary: #0A0E17;
            --bg-secondary: #111827;
            --bg-card: #1A2332;
            --bg-card-hover: #1F2D41;
            --accent-blue: #00A3FF;
            --accent-cyan: #00F0FF;
            --accent-glow: #00A3FF;
            --text-primary: #F0F4F8;
            --text-secondary: #B0C0D0;
            --text-muted: #6B7D90;
            --border-color: #2A3A4F;
            --border-glow: rgba(0, 163, 255, 0.4);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 22px;
            --radius-xl: 32px;
            --shadow-card: 0 8px 30px rgba(0, 0, 0, 0.4);
            --shadow-glow: 0 0 20px rgba(0, 163, 255, 0.25);
            --shadow-glow-hover: 0 0 35px rgba(0, 163, 255, 0.5);
            --font-sans: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
            --transition-fast: 0.2s ease;
            --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --container-max: 1280px;
            --header-height: 70px;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-sans);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.65;
            min-height: 100vh;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        a {
            color: inherit;
            text-decoration: none;
        }

        button {
            cursor: pointer;
            font-family: inherit;
            border: none;
            outline: none;
        }

        input {
            font-family: inherit;
            outline: none;
            border: none;
        }

        .container {
            max-width: var(--container-max);
            margin-left: auto;
            margin-right: auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        .header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(10, 14, 23, 0.82);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(42, 58, 79, 0.6);
            transition: var(--transition-fast);
            height: var(--header-height);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }

        .logo {
            font-size: 1.5rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, #00F0FF 0%, #00A3FF 70%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            white-space: nowrap;
            position: relative;
        }

        .nav-list {
            display: flex;
            align-items: center;
            gap: 32px;
            list-style: none;
        }

        .nav-list a {
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--text-secondary);
            position: relative;
            padding: 8px 0;
            transition: color var(--transition-fast);
        }

        .nav-list a:hover,
        .nav-list a.active {
            color: var(--text-primary);
        }

        .nav-list a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent-cyan);
            transition: width var(--transition-smooth);
            border-radius: 2px;
        }

        .nav-list a:hover::after,
        .nav-list a.active::after {
            width: 100%;
        }

        .nav-right {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .btn-header {
            padding: 10px 22px;
            border-radius: 30px;
            font-weight: 700;
            font-size: 0.9rem;
            letter-spacing: 0.3px;
            transition: all var(--transition-fast);
        }

        .btn-login {
            background: transparent;
            color: var(--text-primary);
            border: 1px solid var(--border-color);
        }

        .btn-login:hover {
            border-color: var(--accent-cyan);
            background: rgba(0, 240, 255, 0.06);
        }

        .btn-signup {
            background: linear-gradient(135deg, #00A3FF 0%, #0066CC 100%);
            color: #ffffff;
            box-shadow: 0 4px 18px rgba(0, 163, 255, 0.35);
            border: 1px solid rgba(0, 240, 255, 0.25);
        }

        .btn-signup:hover {
            box-shadow: 0 8px 28px rgba(0, 163, 255, 0.55);
            transform: translateY(-1px);
        }

        .mobile-menu-btn {
            display: none;
            background: none;
            color: var(--text-primary);
            font-size: 1.8rem;
            line-height: 1;
            padding: 6px;
        }

        .page-hero {
            padding-top: calc(var(--header-height) + 40px);
            padding-bottom: 60px;
            background: radial-gradient(ellipse at 30% top, rgba(0, 163, 255, 0.08) 0%, transparent 55%),
                        radial-gradient(ellipse at 70% bottom, rgba(0, 240, 255, 0.06) 0%, transparent 55%);
        }

        .hero-wrapper {
            display: grid;
            grid-template-columns: 1.25fr 1fr;
            gap: 40px;
            align-items: center;
        }

        .hero-content h1 {
            font-size: 2.8rem;
            font-weight: 800;
            line-height: 1.25;
            color: var(--text-primary);
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }

        .hero-content h1 span {
            background: linear-gradient(135deg, #00F0FF, #00A3FF);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-content p {
            font-size: 1.15rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 32px;
        }

        .hero-stats {
            display: flex;
            gap: 24px;
            flex-wrap: wrap;
        }

        .hero-badge {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 14px 24px;
            text-align: left;
            transition: var(--transition-smooth);
        }

        .hero-badge:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow);
        }

        .hero-badge .badge-num {
            font-size: 1.8rem;
            font-weight: 800;
            background: linear-gradient(135deg, #00F0FF, #00A3FF);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            display: block;
            line-height: 1;
        }

        .hero-badge .badge-label {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-top: 4px;
        }

        .hero-image-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            overflow: hidden;
            position: relative;
            box-shadow: var(--shadow-card);
        }

        .hero-image-card::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(10,14,23,0.8) 0%, transparent 60%);
            z-index: 2;
            pointer-events: none;
            border-radius: var(--radius-lg);
        }

        .hero-image-card img {
            width: 100%;
            height: 380px;
            object-fit: cover;
            border-radius: var(--radius-lg);
        }

        .hero-image-card .img-label {
            position: absolute;
            bottom: 20px;
            left: 20px;
            z-index: 3;
            color: var(--text-primary);
            font-weight: 700;
            font-size: 1.1rem;
            text-shadow: 0 2px 8px rgba(0,0,0,0.9);
        }

        .section-padding {
            padding: 70px 0;
        }

        .section-title {
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: 16px;
            color: var(--text-primary);
            letter-spacing: -0.3px;
        }

        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-secondary);
            margin-bottom: 48px;
            line-height: 1.6;
            max-width: 720px;
        }

        .tips-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .tip-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            position: relative;
            transition: var(--transition-smooth);
            display: flex;
            flex-direction: column;
        }

        .tip-card:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow);
            transform: translateY(-3px);
            background: var(--bg-card-hover);
        }

        .tip-number {
            font-size: 3rem;
            font-weight: 900;
            background: linear-gradient(135deg, rgba(0,240,255,0.3), rgba(0,163,255,0.15));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: 1;
            margin-bottom: 12px;
        }

        .tip-card h3 {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 12px;
        }

        .tip-card p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.65;
            flex: 1;
        }

        .tip-tag {
            display: inline-block;
            padding: 5px 14px;
            background: rgba(0, 163, 255, 0.1);
            border: 1px solid rgba(0, 163, 255, 0.25);
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
            color: var(--accent-cyan);
            margin-top: 16px;
            align-self: flex-start;
        }

        .strategy-section {
            background: var(--bg-secondary);
        }

        .strategy-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: start;
        }

        .strategy-visual {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border-color);
        }

        .strategy-visual img {
            width: 100%;
            height: 340px;
            object-fit: cover;
            border-radius: var(--radius-lg);
        }

        .strategy-detail h2 {
            font-size: 1.9rem;
            font-weight: 800;
            margin-bottom: 18px;
        }

        .strategy-detail p {
            font-size: 1rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 20px;
        }

        .strategy-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .strategy-list li {
            display: flex;
            gap: 14px;
            align-items: flex-start;
            color: var(--text-secondary);
            font-size: 0.98rem;
        }

        .strategy-list li::before {
            content: '▸';
            color: var(--accent-cyan);
            font-weight: bold;
            font-size: 1.2rem;
            line-height: 1.4;
            flex-shrink: 0;
        }

        .scenario-cards {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }

        .scenario-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 32px;
            transition: var(--transition-smooth);
        }

        .scenario-card:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow);
        }

        .scenario-card h4 {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .scenario-card h4 .icon {
            font-size: 1.5rem;
        }

        .scenario-card p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.65;
        }

        .faq-section {
            background: var(--bg-primary);
        }

        .faq-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }

        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 24px 28px;
            transition: var(--transition-smooth);
        }

        .faq-item:hover {
            border-color: var(--border-glow);
            background: var(--bg-card-hover);
        }

        .faq-item h4 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 10px;
        }

        .faq-item p {
            font-size: 0.93rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        .cta-section {
            background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
        }

        .cta-card {
            background: var(--bg-card);
            border: 1px solid var(--border-glow);
            border-radius: var(--radius-xl);
            padding: 48px 40px;
            text-align: left;
            box-shadow: var(--shadow-glow);
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 32px;
        }

        .cta-card h3 {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 8px;
        }

        .cta-card p {
            font-size: 1rem;
            color: var(--text-secondary);
            max-width: 500px;
        }

        .btn-cta-large {
            background: linear-gradient(135deg, #00A3FF 0%, #0066CC 100%);
            color: #ffffff;
            padding: 16px 36px;
            border-radius: 40px;
            font-weight: 700;
            font-size: 1rem;
            letter-spacing: 0.5px;
            box-shadow: 0 8px 28px rgba(0, 163, 255, 0.45);
            transition: var(--transition-smooth);
            white-space: nowrap;
        }

        .btn-cta-large:hover {
            box-shadow: 0 12px 38px rgba(0, 163, 255, 0.65);
            transform: translateY(-2px);
        }

        .footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            padding: 50px 0 30px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 36px;
            margin-bottom: 36px;
        }

        .footer-col h4 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 16px;
        }

        .footer-col a {
            display: block;
            color: var(--text-secondary);
            font-size: 0.9rem;
            margin-bottom: 10px;
            transition: color var(--transition-fast);
        }

        .footer-col a:hover {
            color: var(--accent-cyan);
        }

        .footer-bottom {
            border-top: 1px solid var(--border-color);
            padding-top: 24px;
            text-align: left;
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        .fab-left {
            position: fixed;
            left: 20px;
            bottom: 90px;
            z-index: 999;
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: rgba(10, 14, 23, 0.7);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 2px solid transparent;
            border-image: linear-gradient(135deg, #00F0FF, #00A3FF) 1;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-cyan);
            font-size: 1.5rem;
            box-shadow: 0 0 18px rgba(0, 163, 255, 0.4);
            transition: var(--transition-smooth);
            cursor: pointer;
            animation: float-slow 3s ease-in-out infinite;
        }

        .fab-left:hover {
            transform: scale(1.12);
            box-shadow: 0 0 30px rgba(0, 240, 255, 0.7);
            border-color: var(--accent-cyan);
        }

        @keyframes float-slow {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-5px); }
        }

        @media (max-width: 1024px) {
            .tips-grid {
                grid-template-columns: 1fr 1fr;
            }
            .strategy-block {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .hero-wrapper {
                grid-template-columns: 1fr;
            }
            .hero-image-card {
                max-height: 300px;
            }
        }

        @media (max-width: 768px) {
            .nav-list {
                display: none;
            }
            .mobile-menu-btn {
                display: block;
            }
            .hero-stats {
                flex-direction: column;
                gap: 14px;
            }
            .hero-content h1 {
                font-size: 2rem;
            }
            .tips-grid {
                grid-template-columns: 1fr;
            }
            .scenario-cards {
                grid-template-columns: 1fr;
            }
            .faq-grid {
                grid-template-columns: 1fr;
            }
            .cta-card {
                flex-direction: column;
                align-items: flex-start;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .nav-right .btn-login {
                display: none;
            }
            .btn-signup {
                padding: 8px 16px;
                font-size: 0.8rem;
            }
            .section-title {
                font-size: 1.5rem;
            }
        }

        @media (max-width: 520px) {
            .hero-content h1 {
                font-size: 1.6rem;
            }
            .hero-badge {
                padding: 10px 16px;
            }
            .hero-badge .badge-num {
                font-size: 1.3rem;
            }
            .strategy-visual img {
                height: 200px;
            }
            .cta-card {
                padding: 32px 24px;
            }
            .cta-card h3 {
                font-size: 1.4rem;
            }
            .btn-cta-large {
                width: 100%;
                text-align: center;
            }
        }

/* roulang page: category4 */
:root {
            --bg-primary: #0A0E17;
            --bg-secondary: #111827;
            --bg-card: #1A2332;
            --bg-card-hover: #1F2D41;
            --accent-blue: #00A3FF;
            --accent-cyan: #00F0FF;
            --accent-glow: #00A3FF;
            --text-primary: #F0F4F8;
            --text-secondary: #B0C0D0;
            --text-muted: #6B7D90;
            --border-color: #2A3A4F;
            --border-glow: rgba(0, 163, 255, 0.4);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 22px;
            --radius-xl: 32px;
            --shadow-card: 0 8px 30px rgba(0, 0, 0, 0.4);
            --shadow-glow: 0 0 20px rgba(0, 163, 255, 0.25);
            --shadow-glow-hover: 0 0 35px rgba(0, 163, 255, 0.5);
            --font-sans: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
            --transition-fast: 0.2s ease;
            --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --container-max: 1280px;
            --header-height: 70px;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-sans);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.65;
            min-height: 100vh;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        a {
            color: inherit;
            text-decoration: none;
        }

        button {
            cursor: pointer;
            font-family: inherit;
            border: none;
            outline: none;
        }

        input {
            font-family: inherit;
            outline: none;
            border: none;
        }

        .container {
            max-width: var(--container-max);
            margin-left: auto;
            margin-right: auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        /* HEADER / NAVIGATION */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(10, 14, 23, 0.82);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(42, 58, 79, 0.6);
            transition: var(--transition-fast);
            height: var(--header-height);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }

        .logo {
            font-size: 1.5rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, #00F0FF 0%, #00A3FF 70%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            white-space: nowrap;
            position: relative;
        }

        .nav-list {
            display: flex;
            align-items: center;
            gap: 32px;
            list-style: none;
        }

        .nav-list a {
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--text-secondary);
            position: relative;
            padding: 8px 0;
            transition: color var(--transition-fast);
        }

        .nav-list a:hover,
        .nav-list a.active {
            color: var(--text-primary);
        }

        .nav-list a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent-cyan);
            transition: width var(--transition-smooth);
            border-radius: 2px;
        }

        .nav-list a:hover::after,
        .nav-list a.active::after {
            width: 100%;
        }

        .nav-right {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .btn-header {
            padding: 10px 22px;
            border-radius: 30px;
            font-weight: 700;
            font-size: 0.9rem;
            letter-spacing: 0.3px;
            transition: all var(--transition-fast);
        }

        .btn-login {
            background: transparent;
            color: var(--text-primary);
            border: 1px solid var(--border-color);
        }

        .btn-login:hover {
            border-color: var(--accent-cyan);
            background: rgba(0, 240, 255, 0.06);
        }

        .btn-signup {
            background: linear-gradient(135deg, #00A3FF 0%, #0066CC 100%);
            color: #ffffff;
            box-shadow: 0 4px 18px rgba(0, 163, 255, 0.35);
            border: 1px solid rgba(0, 240, 255, 0.25);
        }

        .btn-signup:hover {
            box-shadow: 0 8px 28px rgba(0, 163, 255, 0.55);
            transform: translateY(-1px);
        }

        .mobile-menu-btn {
            display: none;
            background: none;
            color: var(--text-primary);
            font-size: 1.8rem;
            line-height: 1;
            padding: 6px;
        }

        /* PAGE BANNER */
        .page-banner {
            padding-top: calc(var(--header-height) + 50px);
            padding-bottom: 50px;
            background: radial-gradient(ellipse at 30% top, rgba(0, 163, 255, 0.1) 0%, transparent 55%),
                radial-gradient(ellipse at 70% bottom, rgba(0, 240, 255, 0.07) 0%, transparent 55%);
            position: relative;
        }

        .banner-content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }

        .banner-text h1 {
            font-size: 2.8rem;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 20px;
            background: linear-gradient(135deg, #FFFFFF 0%, #B0C0D0 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .banner-text p {
            font-size: 1.1rem;
            color: var(--text-secondary);
            margin-bottom: 28px;
            line-height: 1.7;
        }

        .banner-visual img {
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-glow);
            width: 100%;
        }

        .btn-primary {
            display: inline-block;
            padding: 14px 32px;
            background: linear-gradient(135deg, #00A3FF 0%, #0066CC 100%);
            color: #fff;
            font-weight: 700;
            border-radius: 30px;
            font-size: 1rem;
            letter-spacing: 0.3px;
            box-shadow: 0 4px 18px rgba(0, 163, 255, 0.35);
            border: 1px solid rgba(0, 240, 255, 0.25);
            transition: all var(--transition-fast);
        }

        .btn-primary:hover {
            box-shadow: 0 8px 28px rgba(0, 163, 255, 0.55);
            transform: translateY(-2px);
        }

        /* FEATURES GRID */
        .features-section {
            padding: 60px 0;
        }

        .section-title {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 16px;
            text-align: left;
        }

        .section-subtitle {
            font-size: 1rem;
            color: var(--text-secondary);
            margin-bottom: 40px;
            text-align: left;
            max-width: 600px;
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }

        .feature-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 32px;
            transition: all var(--transition-smooth);
            position: relative;
        }

        .feature-card:hover {
            background: var(--bg-card-hover);
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow);
            transform: translateY(-4px);
        }

        .feature-icon {
            font-size: 2.2rem;
            margin-bottom: 16px;
        }

        .feature-card h3 {
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 10px;
        }

        .feature-card p {
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* EVENT TIMELINE */
        .events-section {
            padding: 60px 0;
        }

        .event-list {
            display: flex;
            flex-direction: column;
            gap: 24px;
        }

        .event-item {
            display: grid;
            grid-template-columns: 180px 1fr auto;
            gap: 24px;
            align-items: center;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 28px 32px;
            transition: all var(--transition-smooth);
        }

        .event-item:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow);
        }

        .event-date {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--accent-cyan);
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .event-detail h4 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 6px;
        }

        .event-detail p {
            color: var(--text-secondary);
            font-size: 0.95rem;
        }

        .event-badge {
            background: rgba(0, 163, 255, 0.15);
            color: var(--accent-cyan);
            padding: 8px 20px;
            border-radius: 20px;
            font-weight: 700;
            font-size: 0.85rem;
            border: 1px solid rgba(0, 163, 255, 0.3);
            white-space: nowrap;
        }

        /* LEADERBOARD */
        .leaderboard-section {
            padding: 60px 0;
        }

        .leaderboard-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .rank-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 32px 24px;
            text-align: center;
            transition: all var(--transition-smooth);
        }

        .rank-card:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow);
            transform: translateY(-4px);
        }

        .rank-position {
            font-size: 2.4rem;
            font-weight: 800;
            background: linear-gradient(135deg, #00F0FF, #00A3FF);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 8px;
        }

        .rank-name {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 6px;
        }

        .rank-score {
            color: var(--text-muted);
            font-size: 0.9rem;
        }

        /* FAQ */
        .faq-section {
            padding: 60px 0;
        }

        .faq--list {
            display: flex;
            flex-direction: column;
            gap: 16px;
            max-width: 800px;
        }

        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 24px 28px;
            transition: all var(--transition-smooth);
        }

        .faq-item:hover {
            border-color: var(--border-glow);
        }

        .faq-question {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-primary);
        }

        .faq-answer {
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* CTA */
        .cta-section {
            padding: 70px 0;
            background: radial-gradient(ellipse at center, rgba(0, 163, 255, 0.1) 0%, transparent 70%);
            text-align: center;
        }

        .cta-card {
            background: var(--bg-card);
            border: 1px solid var(--border-glow);
            border-radius: var(--radius-lg);
            padding: 50px 40px;
            box-shadow: var(--shadow-glow);
        }

        .cta-card h2 {
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: 16px;
        }

        .cta-card p {
            color: var(--text-secondary);
            margin-bottom: 30px;
            font-size: 1.05rem;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
        }

        .btn-cta {
            display: inline-block;
            padding: 16px 40px;
            background: linear-gradient(135deg, #00A3FF 0%, #0066CC 100%);
            color: #fff;
            font-weight: 700;
            border-radius: 30px;
            font-size: 1.1rem;
            letter-spacing: 0.3px;
            box-shadow: 0 4px 18px rgba(0, 163, 255, 0.35);
            border: 1px solid rgba(0, 240, 255, 0.25);
            transition: all var(--transition-fast);
        }

        .btn-cta:hover {
            box-shadow: 0 8px 28px rgba(0, 163, 255, 0.55);
            transform: translateY(-2px);
        }

        /* FOOTER */
        .footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            padding: 50px 0 30px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
            margin-bottom: 36px;
        }

        .footer-col h4 {
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 18px;
            color: var(--text-primary);
        }

        .footer-col a {
            display: block;
            color: var(--text-muted);
            font-size: 0.9rem;
            margin-bottom: 10px;
            transition: color var(--transition-fast);
        }

        .footer-col a:hover {
            color: var(--accent-cyan);
        }

        .footer-bottom {
            border-top: 1px solid var(--border-color);
            padding-top: 20px;
            text-align: center;
            color: var(--text-muted);
            font-size: 0.85rem;
        }

        /* FAB */
        .fab-left {
            position: fixed;
            left: 20px;
            bottom: 96px;
            z-index: 50;
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: var(--bg-card);
            border: 2px solid transparent;
            background-clip: padding-box;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            color: var(--accent-cyan);
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.5);
            cursor: pointer;
            transition: all var(--transition-smooth);
            animation: neonPulse 2s infinite;
        }

        .fab-left:hover {
            box-shadow: 0 0 25px rgba(0, 240, 255, 0.8);
            transform: scale(1.1);
        }

        @keyframes neonPulse {
            0%, 100% {
                box-shadow: 0 0 15px rgba(0, 240, 255, 0.5);
            }
            50% {
                box-shadow: 0 0 30px rgba(0, 240, 255, 0.8);
            }
        }

        /* RESPONSIVE */
        @media (max-width: 1024px) {
            .banner-content {
                grid-template-columns: 1fr;
            }
            .banner-visual {
                order: -1;
            }
            .banner-text h1 {
                font-size: 2.2rem;
            }
            .features-grid {
                grid-template-columns: 1fr;
            }
            .leaderboard-grid {
                grid-template-columns: 1fr 1fr;
            }
            .event-item {
                grid-template-columns: 130px 1fr;
            }
            .event-badge {
                grid-column: span 2;
                text-align: center;
            }
        }

        @media (max-width: 768px) {
            .nav-list {
                display: none;
                flex-direction: column;
                position: absolute;
                top: var(--header-height);
                left: 0;
                width: 100%;
                background: rgba(10, 14, 23, 0.96);
                backdrop-filter: blur(18px);
                padding: 20px;
                border-bottom: 1px solid var(--border-color);
            }
            .nav-list.open {
                display: flex;
            }
            .nav-list li {
                width: 100%;
            }
            .nav-list a {
                display: block;
                padding: 12px 0;
            }
            .nav-right {
                gap: 10px;
            }
            .btn-header {
                padding: 8px 16px;
                font-size: 0.8rem;
            }
            .mobile-menu-btn {
                display: block;
            }
            .banner-text h1 {
                font-size: 1.8rem;
            }
            .leaderboard-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .cta-card {
                padding: 32px 24px;
            }
            .cta-card h2 {
                font-size: 1.5rem;
            }
            .event-item {
                grid-template-columns: 1fr;
                gap: 12px;
            }
            .event-badge {
                grid-column: span 1;
            }
            .fab-left {
                left: 12px;
                bottom: 80px;
                width: 44px;
                height: 44px;
                font-size: 1.3rem;
            }
        }

        @media (max-width: 520px) {
            .banner-text h1 {
                font-size: 1.5rem;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .feature-card {
                padding: 20px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .btn-cta {
                padding: 14px 28px;
                font-size: 0.95rem;
            }
        }