/* roulang page: index */
:root {
            --primary-bg: #0B0B0B;
            --secondary-bg: #161616;
            --accent-orange: #FF4500;
            --accent-fire: #FF0000;
            --text-white: #FFFFFF;
            --text-warm-gray: #CCCCCC;
            --border-color: #2A2A2A;
            --card-bg: #1A1A1A;
            --shadow-glow: 0 0 20px rgba(255, 69, 0, 0.3);
            --shadow-hover: 0 8px 30px rgba(255, 69, 0, 0.5);
            --radius: 12px;
            --radius-lg: 20px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-heading: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            --font-body: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        * {
            box-sizing: border-box;
        }

        body {
            margin: 0;
            font-family: var(--font-body);
            line-height: 1.6;
            background-color: var(--primary-bg);
            color: var(--text-white);
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }

        h1, h2, h3, h4, h5, h6 {
            font-family: var(--font-heading);
            line-height: 1.3;
            margin-top: 0;
        }

        a {
            text-decoration: none;
            transition: var(--transition);
        }

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

        ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        /* Navbar */
        .navbar {
            background-color: rgba(11, 11, 11, 0.95);
            backdrop-filter: blur(15px);
            border-bottom: 1px solid var(--border-color);
            padding: 12px 0;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1050;
            transition: var(--transition);
        }

        .navbar .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .navbar-brand {
            font-weight: 800;
            font-size: 1.3rem;
            color: var(--text-white);
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 8px;
            text-transform: uppercase;
        }

        .navbar-brand i {
            color: var(--accent-orange);
            font-size: 1.8rem;
        }

        .navbar-toggler {
            background: none;
            border: 1px solid var(--border-color);
            color: var(--text-white);
            padding: 8px 12px;
            border-radius: var(--radius);
            font-size: 1.2rem;
            cursor: pointer;
            display: none;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 30px;
        }

        .nav-links a {
            color: var(--text-warm-gray);
            font-weight: 600;
            font-size: 0.95rem;
            position: relative;
            transition: var(--transition);
            white-space: nowrap;
        }

        .nav-links a:hover,
        .nav-links a.active {
            color: var(--accent-orange);
        }

        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: -6px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--accent-orange);
            border-radius: 2px;
        }

        .nav-buttons {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .btn-login {
            background: transparent;
            color: var(--text-white);
            border: 1px solid var(--border-color);
            padding: 8px 18px;
            border-radius: var(--radius);
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }

        .btn-login:hover {
            border-color: var(--accent-orange);
            color: var(--accent-orange);
        }

        .btn-signup {
            background: linear-gradient(135deg, var(--accent-orange), var(--accent-fire));
            color: #fff;
            border: none;
            padding: 8px 20px;
            border-radius: var(--radius);
            font-weight: 700;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 4px 15px rgba(255, 69, 0, 0.4);
            white-space: nowrap;
        }

        .btn-signup:hover {
            box-shadow: 0 6px 25px rgba(255, 69, 0, 0.6);
            transform: translateY(-2px);
            color: #fff;
        }

        @media (max-width: 991px) {
            .navbar-toggler {
                display: block;
            }
            .nav-links {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: rgba(11, 11, 11, 0.98);
                flex-direction: column;
                padding: 20px;
                gap: 16px;
                border-bottom: 1px solid var(--border-color);
            }
            .nav-links.show {
                display: flex;
            }
            .nav-buttons {
                gap: 8px;
            }
            .btn-login,
            .btn-signup {
                padding: 6px 14px;
                font-size: 0.85rem;
            }
        }

        /* Hero Full-Width Video */
        .hero-video {
            position: relative;
            width: 100%;
            min-height: 85vh;
            background: linear-gradient(135deg, rgba(0,0,0,0.85) 0%, rgba(22,22,22,0.9) 100%), url('/assets/images/backpic/back-1.jpg') center/cover no-repeat;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-top: 0;
            overflow: hidden;
        }

        .hero-overlay {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: radial-gradient(circle at center, transparent 40%, var(--primary-bg) 100%);
            z-index: 1;
        }

        .hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 800px;
            padding: 0 20px;
        }

        .hero-play-btn {
            width: 90px;
            height: 90px;
            background: linear-gradient(135deg, var(--accent-orange), var(--accent-fire));
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 2.5rem;
            color: #fff;
            box-shadow: 0 0 40px rgba(255, 69, 0, 0.6);
            margin-bottom: 30px;
            cursor: pointer;
            transition: var(--transition);
            animation: pulse-btn 2s infinite;
        }

        .hero-play-btn:hover {
            transform: scale(1.08);
            box-shadow: 0 0 60px rgba(255, 69, 0, 0.9);
        }

        @keyframes pulse-btn {
            0%, 100% { box-shadow: 0 0 40px rgba(255, 69, 0, 0.6); }
            50% { box-shadow: 0 0 70px rgba(255, 69, 0, 0.9); }
        }

        .hero-content h1 {
            font-size: 3.5rem;
            font-weight: 900;
            color: var(--text-white);
            text-transform: uppercase;
            letter-spacing: -1px;
            margin-bottom: 20px;
            line-height: 1.2;
        }

        .hero-content .highlight {
            color: var(--accent-orange);
        }

        .hero-content p {
            font-size: 1.15rem;
            color: var(--text-warm-gray);
            margin-bottom: 35px;
            line-height: 1.7;
            max-width: 650px;
            margin-left: auto;
            margin-right: auto;
        }

        .hero-ctas {
            display: flex;
            gap: 15px;
            justify-content: center;
            flex-wrap: wrap;
        }

        .btn-hero-primary {
            background: linear-gradient(135deg, var(--accent-orange), var(--accent-fire));
            color: #fff;
            border: none;
            padding: 14px 35px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 1.05rem;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 6px 25px rgba(255, 69, 0, 0.5);
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .btn-hero-primary:hover {
            box-shadow: 0 8px 35px rgba(255, 69, 0, 0.7);
            transform: translateY(-3px);
            color: #fff;
        }

        .btn-hero-outline {
            background: transparent;
            color: var(--text-white);
            border: 2px solid var(--accent-orange);
            padding: 12px 33px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 1.05rem;
            cursor: pointer;
            transition: var(--transition);
        }

        .btn-hero-outline:hover {
            background: var(--accent-orange);
            color: #fff;
        }

        @media (max-width: 768px) {
            .hero-video {
                min-height: 80vh;
            }
            .hero-content h1 {
                font-size: 2.2rem;
            }
            .hero-content p {
                font-size: 0.95rem;
            }
            .hero-play-btn {
                width: 65px;
                height: 65px;
                font-size: 1.8rem;
                margin-bottom: 20px;
            }
        }

        /* Sections */
        section {
            padding: 80px 0;
        }

        .section-header {
            margin-bottom: 50px;
        }

        .section-header h2 {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 12px;
            text-transform: uppercase;
        }

        .section-header .underline {
            width: 60px;
            height: 4px;
            background: var(--accent-orange);
            border-radius: 2px;
            margin-bottom: 15px;
        }

        .section-header p {
            color: var(--text-warm-gray);
            font-size: 1rem;
            max-width: 600px;
        }

        /* Latest Updates */
        .latest-updates {
            background: var(--secondary-bg);
        }

        .update-list {
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: 30px;
            align-items: start;
        }

        .update-main-list {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

        .update-item {
            display: flex;
            align-items: center;
            gap: 15px;
            padding: 15px;
            background: var(--card-bg);
            border-radius: var(--radius);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }

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

        .update-icon {
            width: 40px;
            height: 40px;
            background: var(--accent-orange);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1rem;
            color: #fff;
            flex-shrink: 0;
        }

        .update-text h5 {
            margin: 0 0 4px;
            font-size: 0.95rem;
            font-weight: 700;
        }

        .update-text h5 a {
            color: var(--text-white);
        }

        .update-text h5 a:hover {
            color: var(--accent-orange);
        }

        .update-text small {
            color: var(--text-warm-gray);
            font-size: 0.8rem;
        }

        .update-featured-card {
            background: linear-gradient(135deg, var(--accent-orange), var(--accent-fire));
            border-radius: var(--radius-lg);
            padding: 25px;
            color: #fff;
        }

        .update-featured-card h4 {
            font-weight: 800;
            margin-bottom: 10px;
        }

        .update-featured-card p {
            font-size: 0.9rem;
            opacity: 0.9;
            margin-bottom: 15px;
        }

        .btn-sm-light {
            background: #fff;
            color: var(--accent-orange);
            padding: 8px 18px;
            border-radius: 50px;
            font-weight: 700;
            border: none;
            cursor: pointer;
        }

        @media (max-width: 768px) {
            .update-list {
                grid-template-columns: 1fr;
            }
        }

        /* Quick Answers */
        .quick-answers {
            background: var(--primary-bg);
        }

        .accordion-custom .accordion-item {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: var(--radius) !important;
            margin-bottom: 10px;
            overflow: hidden;
        }

        .accordion-custom .accordion-button {
            background: var(--card-bg);
            color: var(--text-white);
            font-weight: 700;
            box-shadow: none;
            padding: 16px 20px;
        }

        .accordion-custom .accordion-button:not(.collapsed) {
            background: var(--accent-orange);
            color: #fff;
        }

        .accordion-custom .accordion-body {
            color: var(--text-warm-gray);
            padding: 20px;
            line-height: 1.7;
        }

        /* Info Grid */
        .info-grid-section {
            background: var(--secondary-bg);
        }

        .info-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
        }

        .info-card {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 30px;
            transition: var(--transition);
            display: flex;
            gap: 20px;
            align-items: flex-start;
        }

        .info-card:hover {
            border-color: var(--accent-orange);
            box-shadow: var(--shadow-glow);
            transform: translateY(-3px);
        }

        .info-card-icon {
            width: 60px;
            height: 60px;
            background: linear-gradient(135deg, var(--accent-orange), var(--accent-fire));
            border-radius: var(--radius);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: #fff;
            flex-shrink: 0;
        }

        .info-card-text h4 {
            font-weight: 800;
            margin-bottom: 8px;
        }

        .info-card-text p {
            color: var(--text-warm-gray);
            font-size: 0.9rem;
            margin: 0;
        }

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

        /* Security */
        .security-section {
            background: var(--primary-bg);
        }

        .security-icons {
            display: flex;
            gap: 30px;
            flex-wrap: wrap;
            justify-content: center;
        }

        .security-item {
            text-align: left;
            padding: 25px;
            background: var(--card-bg);
            border-radius: var(--radius);
            border: 1px solid var(--border-color);
            flex: 1 1 200px;
            max-width: 220px;
        }

        .security-item i {
            font-size: 2rem;
            color: var(--accent-orange);
            margin-bottom: 12px;
        }

        .security-item h5 {
            font-weight: 800;
            margin-bottom: 6px;
        }

        .security-item p {
            color: var(--text-warm-gray);
            font-size: 0.85rem;
            margin: 0;
        }

        /* App Section */
        .app-section {
            background: var(--secondary-bg);
        }

        .app-wrapper {
            display: flex;
            align-items: center;
            gap: 40px;
            flex-wrap: wrap;
        }

        .app-text {
            flex: 1;
        }

        .app-text h2 {
            font-weight: 800;
            font-size: 2rem;
            margin-bottom: 15px;
        }

        .app-text p {
            color: var(--text-warm-gray);
            margin-bottom: 20px;
        }

        .app-badges {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
        }

        .badge-download {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            padding: 10px 20px;
            border-radius: 50px;
            color: var(--text-white);
            font-weight: 700;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            cursor: pointer;
            transition: var(--transition);
        }

        .badge-download:hover {
            background: var(--accent-orange);
            border-color: var(--accent-orange);
        }

        .app-image {
            flex: 1;
            text-align: center;
        }

        .app-image img {
            max-width: 320px;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-glow);
        }

        @media (max-width: 768px) {
            .app-wrapper {
                flex-direction: column;
            }
        }

        /* Footer */
        .footer {
            background: var(--primary-bg);
            border-top: 1px solid var(--border-color);
            padding: 50px 0 25px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 30px;
        }

        .footer-brand {
            font-weight: 800;
            font-size: 1.4rem;
            text-transform: uppercase;
            margin-bottom: 10px;
        }

        .footer p, .footer a {
            color: var(--text-warm-gray);
            font-size: 0.9rem;
        }

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

        .footer-links ul li {
            margin-bottom: 8px;
        }

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

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

        /* FAB */
        .fab-floating {
            position: fixed;
            left: 25px;
            bottom: 90px;
            z-index: 1055;
            width: 55px;
            height: 55px;
            background: var(--card-bg);
            border: 2px solid var(--accent-orange);
            border-radius: 50px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-orange);
            font-size: 1.5rem;
            cursor: pointer;
            box-shadow: 0 0 15px rgba(255, 69, 0, 0.5);
            transition: var(--transition);
            animation: float-icon 3s infinite ease-in-out;
        }

        .fab-floating:hover {
            width: 140px;
            justify-content: flex-start;
            padding-left: 18px;
            background: var(--accent-orange);
            color: #fff;
            box-shadow: 0 0 30px rgba(255, 69, 0, 0.7);
        }

        .fab-floating span {
            display: none;
            margin-left: 8px;
            font-weight: 700;
            font-size: 0.9rem;
            white-space: nowrap;
        }

        .fab-floating:hover span {
            display: inline;
        }

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

/* roulang page: article */
:root {
            --primary-bg: #0B0B0B;
            --secondary-bg: #161616;
            --accent-orange: #FF4500;
            --accent-fire: #FF0000;
            --text-white: #FFFFFF;
            --text-warm-gray: #CCCCCC;
            --border-color: #2A2A2A;
            --card-bg: #1A1A1A;
            --shadow-glow: 0 0 20px rgba(255, 69, 0, 0.3);
            --shadow-hover: 0 8px 30px rgba(255, 69, 0, 0.5);
            --radius: 12px;
            --radius-lg: 20px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-heading: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            --font-body: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        * {
            box-sizing: border-box;
        }

        body {
            margin: 0;
            font-family: var(--font-body);
            line-height: 1.6;
            background-color: var(--primary-bg);
            color: var(--text-white);
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
            padding-top: 70px;
        }

        a {
            text-decoration: none;
            transition: var(--transition);
            color: var(--accent-orange);
        }

        a:hover {
            color: var(--accent-fire);
        }

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

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        h1, h2, h3, h4, h5, h6 {
            font-family: var(--font-heading);
            font-weight: 700;
            line-height: 1.3;
        }

        h1 {
            font-size: 2.8rem;
            margin-bottom: 1rem;
            background: linear-gradient(135deg, var(--text-white), var(--text-warm-gray));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        h2 {
            font-size: 2rem;
            margin-bottom: 0.8rem;
            color: var(--text-white);
        }

        h3 {
            font-size: 1.5rem;
            margin-bottom: 0.6rem;
            color: var(--accent-orange);
        }

        p {
            margin-bottom: 1.2rem;
            color: var(--text-warm-gray);
            font-size: 1.05rem;
        }

        button {
            cursor: pointer;
            border: none;
            outline: none;
            transition: var(--transition);
        }

        /* Navbar */
        .navbar {
            background-color: rgba(11, 11, 11, 0.97);
            backdrop-filter: blur(15px);
            border-bottom: 1px solid var(--border-color);
            padding: 12px 0;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1050;
        }

        .navbar .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .navbar-brand {
            font-weight: 800;
            font-size: 1.3rem;
            color: var(--text-white);
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 8px;
            text-transform: uppercase;
        }

        .navbar-brand i {
            color: var(--accent-orange);
            font-size: 1.8rem;
        }

        .navbar-toggler {
            background: none;
            border: 1px solid var(--border-color);
            color: var(--text-white);
            padding: 8px 12px;
            border-radius: var(--radius);
            font-size: 1.2rem;
            cursor: pointer;
            display: none;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 30px;
        }

        .nav-links a {
            color: var(--text-warm-gray);
            font-weight: 600;
            font-size: 0.95rem;
            position: relative;
            white-space: nowrap;
        }

        .nav-links a:hover,
        .nav-links a.active {
            color: var(--accent-orange);
        }

        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: -6px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--accent-orange);
            border-radius: 2px;
        }

        .nav-buttons {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .btn-login {
            background: transparent;
            color: var(--text-white);
            border: 1px solid var(--border-color);
            padding: 8px 18px;
            border-radius: var(--radius);
            font-weight: 600;
            white-space: nowrap;
            cursor: pointer;
        }

        .btn-login:hover {
            border-color: var(--accent-orange);
            color: var(--accent-orange);
            background: rgba(255, 69, 0, 0.05);
        }

        .btn-signup {
            background: linear-gradient(135deg, var(--accent-orange), var(--accent-fire));
            color: #fff;
            border: none;
            padding: 8px 20px;
            border-radius: var(--radius);
            font-weight: 700;
            white-space: nowrap;
            box-shadow: 0 4px 15px rgba(255, 69, 0, 0.4);
            cursor: pointer;
        }

        .btn-signup:hover {
            box-shadow: 0 6px 25px rgba(255, 69, 0, 0.6);
            transform: translateY(-2px);
            color: #fff;
        }

        /* Article Header Banner */
        .article-banner {
            background: linear-gradient(135deg, rgba(0,0,0,0.88) 0%, rgba(22,22,22,0.92) 100%), url('/assets/images/backpic/back-2.jpg') center/cover no-repeat;
            border-bottom: 2px solid var(--accent-orange);
            padding: 50px 0;
            position: relative;
        }

        .article-banner::before {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, transparent, var(--accent-orange), var(--accent-fire), transparent);
        }

        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            align-items: center;
            margin-top: 15px;
        }

        .article-meta span {
            color: var(--text-warm-gray);
            font-size: 0.9rem;
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .article-meta .badge-category {
            background: var(--accent-orange);
            color: #000;
            padding: 4px 14px;
            border-radius: 20px;
            font-weight: 700;
            font-size: 0.85rem;
            text-transform: uppercase;
        }

        /* Main Content Area */
        .article-main {
            padding: 60px 0;
            background-color: var(--primary-bg);
        }

        .article-layout {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
        }

        .article-body {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 40px;
            line-height: 1.8;
        }

        .article-body img {
            border-radius: var(--radius);
            margin: 30px 0;
        }

        .article-body blockquote {
            border-left: 4px solid var(--accent-orange);
            background: rgba(255, 69, 0, 0.05);
            padding: 20px 25px;
            margin: 25px 0;
            border-radius: 0 var(--radius) var(--radius) 0;
            color: var(--text-warm-gray);
            font-style: italic;
        }

        .article-body ul, .article-body ol {
            margin-left: 20px;
            margin-bottom: 20px;
            color: var(--text-warm-gray);
        }

        .article-body li {
            margin-bottom: 10px;
        }

        .article-body strong {
            color: var(--accent-orange);
        }

        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 25px;
        }

        .sidebar-card {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            padding: 25px;
        }

        .sidebar-card h4 {
            color: var(--accent-orange);
            font-size: 1.2rem;
            margin-bottom: 18px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .sidebar-card ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .sidebar-card ul li {
            margin-bottom: 12px;
        }

        .sidebar-card ul li a {
            color: var(--text-warm-gray);
            font-size: 0.95rem;
            display: flex;
            align-items: center;
            gap: 8px;
            transition: var(--transition);
        }

        .sidebar-card ul li a:hover {
            color: var(--accent-orange);
            padding-left: 5px;
        }

        .sidebar-card .cta-mini {
            background: linear-gradient(135deg, var(--accent-orange), var(--accent-fire));
            color: #fff;
            text-align: center;
            padding: 14px;
            border-radius: var(--radius);
            font-weight: 700;
            display: block;
            margin-top: 15px;
            box-shadow: var(--shadow-glow);
        }

        .sidebar-card .cta-mini:hover {
            color: #fff;
            box-shadow: var(--shadow-hover);
            transform: translateY(-2px);
        }

        /* Not Found State */
        .not-found {
            text-align: center;
            padding: 80px 20px;
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
        }

        .not-found i {
            font-size: 4rem;
            color: var(--accent-orange);
            margin-bottom: 20px;
            display: block;
        }

        .not-found h2 {
            margin-bottom: 15px;
        }

        .not-found .btn-home {
            display: inline-block;
            background: linear-gradient(135deg, var(--accent-orange), var(--accent-fire));
            color: #fff;
            padding: 12px 30px;
            border-radius: var(--radius);
            font-weight: 700;
            margin-top: 20px;
            box-shadow: var(--shadow-glow);
        }

        .not-found .btn-home:hover {
            color: #fff;
            box-shadow: var(--shadow-hover);
            transform: translateY(-2px);
        }

        /* CTA Section */
        .cta-section {
            background: linear-gradient(135deg, var(--secondary-bg), #1A0A0A);
            padding: 60px 0;
            border-top: 1px solid var(--border-color);
        }

        .cta-card {
            background: var(--card-bg);
            border: 2px solid var(--accent-orange);
            border-radius: var(--radius-lg);
            padding: 40px;
            text-align: center;
            max-width: 700px;
            margin: 0 auto;
            box-shadow: var(--shadow-glow);
        }

        .cta-card h3 {
            color: var(--text-white);
            font-size: 1.8rem;
            margin-bottom: 15px;
        }

        .cta-card p {
            margin-bottom: 25px;
        }

        .btn-cta-large {
            background: linear-gradient(135deg, var(--accent-orange), var(--accent-fire));
            color: #fff;
            padding: 15px 40px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 1.1rem;
            display: inline-block;
            box-shadow: var(--shadow-glow);
        }

        .btn-cta-large:hover {
            color: #fff;
            box-shadow: var(--shadow-hover);
            transform: translateY(-3px);
        }

        /* Footer */
        .footer {
            background-color: var(--secondary-bg);
            border-top: 1px solid var(--border-color);
            padding: 50px 0 20px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-brand {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--accent-orange);
            margin-bottom: 15px;
            text-transform: uppercase;
        }

        .footer p {
            color: var(--text-warm-gray);
            font-size: 0.9rem;
            margin-bottom: 10px;
        }

        .footer h5 {
            color: var(--text-white);
            font-size: 1.1rem;
            margin-bottom: 18px;
            position: relative;
            padding-bottom: 10px;
        }

        .footer h5::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 30px;
            height: 2px;
            background: var(--accent-orange);
        }

        .footer-links ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .footer-links ul li {
            margin-bottom: 10px;
        }

        .footer-links ul li a {
            color: var(--text-warm-gray);
            font-size: 0.9rem;
        }

        .footer-links ul li a:hover {
            color: var(--accent-orange);
        }

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

        /* FAB */
        .fab-support {
            position: fixed;
            left: 20px;
            bottom: 90px;
            z-index: 1040;
            width: 55px;
            height: 55px;
            background: linear-gradient(135deg, var(--accent-orange), var(--accent-fire));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: #fff;
            cursor: pointer;
            box-shadow: 0 0 15px rgba(255, 69, 0, 0.5);
            animation: pulse-fab 2s infinite;
            border: none;
        }

        .fab-support:hover {
            animation: none;
            transform: scale(1.1);
            box-shadow: 0 0 30px rgba(255, 69, 0, 0.8);
        }

        @keyframes pulse-fab {
            0%, 100% { box-shadow: 0 0 15px rgba(255, 69, 0, 0.5); }
            50% { box-shadow: 0 0 30px rgba(255, 69, 0, 0.9); }
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .article-layout {
                grid-template-columns: 1fr;
            }
            .article-sidebar {
                flex-direction: row;
                flex-wrap: wrap;
            }
            .sidebar-card {
                flex: 1 1 250px;
            }
        }

        @media (max-width: 768px) {
            h1 { font-size: 2rem; }
            .article-body { padding: 25px; }
            .article-banner { padding: 35px 0; }
            .footer-grid { grid-template-columns: 1fr; gap: 30px; }
            .navbar-toggler { display: block; }
            .nav-links {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: rgba(11, 11, 11, 0.98);
                flex-direction: column;
                padding: 20px;
                gap: 16px;
                border-bottom: 1px solid var(--border-color);
            }
            .nav-links.show { display: flex; }
            .nav-buttons { gap: 8px; }
            .btn-login, .btn-signup { padding: 6px 14px; font-size: 0.85rem; }
        }

        @media (max-width: 520px) {
            h1 { font-size: 1.6rem; }
            .article-body { padding: 20px; font-size: 0.95rem; }
            .article-sidebar { flex-direction: column; }
            .cta-card { padding: 25px; }
            .fab-support { width: 48px; height: 48px; font-size: 1.3rem; left: 12px; bottom: 80px; }
        }

/* roulang page: category1 */
:root {
            --primary-bg: #0B0B0B;
            --secondary-bg: #161616;
            --accent-orange: #FF4500;
            --accent-fire: #FF0000;
            --text-white: #FFFFFF;
            --text-warm-gray: #CCCCCC;
            --border-color: #2A2A2A;
            --card-bg: #1A1A1A;
            --shadow-glow: 0 0 20px rgba(255, 69, 0, 0.3);
            --shadow-hover: 0 8px 30px rgba(255, 69, 0, 0.5);
            --radius: 12px;
            --radius-lg: 20px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-heading: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            --font-body: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        * {
            box-sizing: border-box;
        }

        body {
            margin: 0;
            font-family: var(--font-body);
            line-height: 1.6;
            background-color: var(--primary-bg);
            color: var(--text-white);
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
            padding-top: 70px;
        }

        a {
            text-decoration: none;
            transition: var(--transition);
        }

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

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        h1, h2, h3, h4, h5, h6 {
            font-family: var(--font-heading);
            font-weight: 700;
            line-height: 1.3;
            margin-top: 0;
        }

        h1 {
            font-size: 2.8rem;
            margin-bottom: 1rem;
        }
        h2 {
            font-size: 2rem;
            margin-bottom: 1rem;
        }
        h3 {
            font-size: 1.5rem;
            margin-bottom: 0.8rem;
        }
        p {
            margin-bottom: 1rem;
            color: var(--text-warm-gray);
        }

        /* Navbar */
        .navbar {
            background-color: rgba(11, 11, 11, 0.95);
            backdrop-filter: blur(15px);
            border-bottom: 1px solid var(--border-color);
            padding: 12px 0;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1050;
            transition: var(--transition);
        }
        .navbar .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.3rem;
            color: var(--text-white);
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 8px;
            text-transform: uppercase;
        }
        .navbar-brand i {
            color: var(--accent-orange);
            font-size: 1.8rem;
        }
        .navbar-toggler {
            background: none;
            border: 1px solid var(--border-color);
            color: var(--text-white);
            padding: 8px 12px;
            border-radius: var(--radius);
            font-size: 1.2rem;
            cursor: pointer;
            display: none;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 30px;
        }
        .nav-links a {
            color: var(--text-warm-gray);
            font-weight: 600;
            font-size: 0.95rem;
            position: relative;
            transition: var(--transition);
            white-space: nowrap;
        }
        .nav-links a:hover,
        .nav-links a.active {
            color: var(--accent-orange);
        }
        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: -6px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--accent-orange);
            border-radius: 2px;
        }
        .nav-buttons {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .btn-login {
            background: transparent;
            color: var(--text-white);
            border: 1px solid var(--border-color);
            padding: 8px 18px;
            border-radius: var(--radius);
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }
        .btn-login:hover {
            border-color: var(--accent-orange);
            color: var(--accent-orange);
        }
        .btn-signup {
            background: linear-gradient(135deg, var(--accent-orange), var(--accent-fire));
            color: #fff;
            border: none;
            padding: 8px 20px;
            border-radius: var(--radius);
            font-weight: 700;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 4px 15px rgba(255, 69, 0, 0.4);
            white-space: nowrap;
        }
        .btn-signup:hover {
            box-shadow: 0 6px 25px rgba(255, 69, 0, 0.6);
            transform: translateY(-2px);
            color: #fff;
        }

        /* Hero Section */
        .hero-section {
            background: linear-gradient(135deg, rgba(11,11,11,0.9) 0%, rgba(22,22,22,0.95) 100%), url('/assets/images/backpic/back-1.jpg') center/cover no-repeat;
            padding: 80px 0 70px;
            position: relative;
            overflow: hidden;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: radial-gradient(circle at 30% 50%, rgba(255,69,0,0.15) 0%, transparent 60%);
            pointer-events: none;
        }
        .hero-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
            position: relative;
            z-index: 1;
        }
        .hero-badges {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
            margin-bottom: 20px;
        }
        .badge-glow {
            background: rgba(255,69,0,0.15);
            border: 1px solid rgba(255,69,0,0.4);
            color: var(--accent-orange);
            padding: 8px 16px;
            border-radius: 30px;
            font-weight: 700;
            font-size: 0.9rem;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .badge-glow i {
            font-size: 0.9rem;
        }
        .hero-text h1 {
            color: var(--text-white);
            font-size: 2.5rem;
            font-weight: 800;
            line-height: 1.2;
        }
        .hero-text p {
            font-size: 1.1rem;
            color: var(--text-warm-gray);
            margin: 16px 0 24px;
            max-width: 500px;
        }
        .btn-cta {
            background: linear-gradient(135deg, var(--accent-orange), var(--accent-fire));
            color: #fff;
            border: none;
            padding: 14px 36px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 1.1rem;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 6px 25px rgba(255, 69, 0, 0.5);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .btn-cta:hover {
            box-shadow: 0 8px 35px rgba(255, 69, 0, 0.7);
            transform: translateY(-2px);
            color: #fff;
        }
        .hero-image-wrap {
            position: relative;
        }
        .hero-image-wrap img {
            border-radius: var(--radius-lg);
            box-shadow: 0 10px 40px rgba(0,0,0,0.6);
            border: 2px solid var(--border-color);
        }
        .image-badge {
            position: absolute;
            bottom: 20px;
            right: 20px;
            background: rgba(0,0,0,0.8);
            backdrop-filter: blur(10px);
            border: 1px solid var(--accent-orange);
            padding: 12px 20px;
            border-radius: var(--radius);
            text-align: center;
        }
        .image-badge span {
            display: block;
            font-weight: 700;
            color: var(--accent-orange);
            font-size: 1.5rem;
        }
        .image-badge small {
            color: var(--text-warm-gray);
            font-size: 0.8rem;
        }

        /* Metrics Section */
        .metrics-section {
            background: var(--secondary-bg);
            padding: 50px 0;
            border-bottom: 1px solid var(--border-color);
        }
        .metrics-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 30px;
            text-align: center;
        }
        .metric-item h3 {
            font-size: 2rem;
            color: var(--accent-orange);
            margin-bottom: 4px;
        }
        .metric-item p {
            font-size: 0.95rem;
            color: var(--text-warm-gray);
            margin: 0;
        }

        /* Strategy Cards */
        .strategy-section {
            padding: 80px 0;
        }
        .section-header {
            margin-bottom: 50px;
        }
        .section-header h2 {
            color: var(--text-white);
        }
        .section-header p {
            color: var(--text-warm-gray);
            font-size: 1.05rem;
            max-width: 600px;
        }
        .strategy-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }
        .strategy-card {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 30px;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }
        .strategy-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 4px;
            height: 40px;
            background: var(--accent-orange);
            border-radius: 0 0 4px 0;
        }
        .strategy-card:hover {
            border-color: var(--accent-orange);
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }
        .card-icon {
            width: 50px;
            height: 50px;
            background: rgba(255,69,0,0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: var(--accent-orange);
            margin-bottom: 16px;
        }
        .strategy-card h3 {
            font-size: 1.25rem;
            color: var(--text-white);
            margin-bottom: 10px;
        }
        .strategy-card p {
            font-size: 0.95rem;
            color: var(--text-warm-gray);
            margin-bottom: 16px;
            line-height: 1.6;
        }
        .card-tag {
            display: inline-block;
            background: rgba(255,69,0,0.1);
            color: var(--accent-orange);
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
        }

        /* Comparison Table */
        .comparison-section {
            background: var(--secondary-bg);
            padding: 80px 0;
        }
        .table-wrap {
            overflow-x: auto;
        }
        .custom-table {
            width: 100%;
            border-collapse: separate;
            border-spacing: 0 12px;
        }
        .custom-table thead th {
            background: var(--card-bg);
            color: var(--accent-orange);
            padding: 16px 20px;
            font-weight: 700;
            text-align: left;
            border: 1px solid var(--border-color);
            border-radius: var(--radius) var(--radius) 0 0;
            font-size: 0.95rem;
        }
        .custom-table tbody td {
            background: var(--card-bg);
            padding: 14px 20px;
            color: var(--text-warm-gray);
            border: 1px solid var(--border-color);
            font-size: 0.9rem;
            vertical-align: middle;
        }
        .custom-table tbody tr td:first-child {
            font-weight: 600;
            color: var(--text-white);
        }
        .table-badge {
            display: inline-block;
            background: rgba(255,69,0,0.1);
            color: var(--accent-orange);
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
        }

        /* FAQ Section */
        .faq-section {
            padding: 80px 0;
        }
        .accordion-item {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            margin-bottom: 12px;
            border-radius: var(--radius);
            overflow: hidden;
        }
        .accordion-button {
            background: var(--card-bg);
            color: var(--text-white);
            font-weight: 600;
            padding: 18px 24px;
            box-shadow: none;
            border: none;
            width: 100%;
            text-align: left;
            font-size: 1rem;
            cursor: pointer;
            transition: var(--transition);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .accordion-button:hover {
            color: var(--accent-orange);
        }
        .accordion-button:not(.collapsed) {
            background: var(--card-bg);
            color: var(--accent-orange);
            border-bottom: 1px solid var(--border-color);
        }
        .accordion-button::after {
            font-family: "Font Awesome 6 Free";
            content: '\f107';
            font-weight: 900;
            background-image: none;
            transition: transform 0.3s;
        }
        .accordion-button:not(.collapsed)::after {
            transform: rotate(180deg);
            color: var(--accent-orange);
        }
        .accordion-body {
            padding: 18px 24px;
            color: var(--text-warm-gray);
            line-height: 1.7;
        }

        /* CTA Section */
        .cta-section {
            padding: 70px 0;
            background: linear-gradient(135deg, rgba(22,22,22,0.98) 0%, rgba(11,11,11,1) 100%), url('/assets/images/backpic/back-2.jpg') center/cover;
            text-align: center;
            border-radius: var(--radius-lg);
            margin: 0 20px 80px;
        }
        .cta-section h2 {
            color: var(--text-white);
            font-size: 2rem;
        }
        .cta-section p {
            color: var(--text-warm-gray);
            max-width: 600px;
            margin: 12px auto 28px;
        }

        /* Footer */
        .footer {
            background: var(--secondary-bg);
            border-top: 1px solid var(--border-color);
            padding: 50px 0 30px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 30px;
        }
        .footer-brand {
            font-weight: 800;
            font-size: 1.5rem;
            color: var(--text-white);
            margin-bottom: 12px;
        }
        .footer p {
            font-size: 0.9rem;
            color: var(--text-warm-gray);
        }
        .footer-links h5,
        .footer h5 {
            color: var(--text-white);
            font-size: 1rem;
            margin-bottom: 12px;
        }
        .footer-links ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-links ul li {
            margin-bottom: 8px;
        }
        .footer-links ul li a {
            color: var(--text-warm-gray);
            font-size: 0.9rem;
            transition: var(--transition);
        }
        .footer-links ul li a:hover {
            color: var(--accent-orange);
        }
        .footer-bottom {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid var(--border-color);
            font-size: 0.85rem;
            color: var(--text-warm-gray);
        }

        /* FAB */
        .fab-left {
            position: fixed;
            left: 16px;
            bottom: 96px;
            z-index: 1050;
            width: 52px;
            height: 52px;
            background: var(--card-bg);
            backdrop-filter: blur(10px);
            border: 2px solid var(--accent-orange);
            border-radius: 50px;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 0 15px rgba(255, 69, 0, 0.5);
            transition: var(--transition);
            cursor: pointer;
            color: var(--accent-orange);
            font-size: 1.4rem;
        }
        .fab-left:hover {
            box-shadow: 0 0 25px rgba(255, 69, 0, 0.8);
            transform: scale(1.1);
            background: var(--accent-orange);
            color: #fff;
        }

        @media (max-width: 992px) {
            .hero-grid {
                grid-template-columns: 1fr;
            }
            .hero-image-wrap {
                max-width: 400px;
                margin: 0 auto;
            }
            .strategy-grid {
                grid-template-columns: 1fr 1fr;
            }
            .metrics-grid {
                grid-template-columns: 1fr 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .nav-links {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: rgba(11, 11, 11, 0.98);
                flex-direction: column;
                padding: 20px;
                gap: 16px;
                border-bottom: 1px solid var(--border-color);
            }
            .nav-links.show {
                display: flex;
            }
            .navbar-toggler {
                display: block;
            }
        }
        @media (max-width: 768px) {
            h1 { font-size: 2rem; }
            h2 { font-size: 1.5rem; }
            .hero-section { padding: 50px 0; }
            .strategy-grid {
                grid-template-columns: 1fr;
            }
            .metrics-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }

/* roulang page: category2 */
:root {
            --primary-bg: #0B0B0B;
            --secondary-bg: #161616;
            --accent-orange: #FF4500;
            --accent-fire: #FF0000;
            --text-white: #FFFFFF;
            --text-warm-gray: #CCCCCC;
            --border-color: #2A2A2A;
            --card-bg: #1A1A1A;
            --shadow-glow: 0 0 20px rgba(255, 69, 0, 0.3);
            --shadow-hover: 0 8px 30px rgba(255, 69, 0, 0.5);
            --radius: 12px;
            --radius-lg: 20px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-heading: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            --font-body: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        body {
            margin: 0;
            font-family: var(--font-body);
            line-height: 1.6;
            background-color: var(--primary-bg);
            color: var(--text-white);
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            transition: var(--transition);
        }

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

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        /* Navbar */
        .navbar {
            background-color: rgba(11, 11, 11, 0.95);
            backdrop-filter: blur(15px);
            border-bottom: 1px solid var(--border-color);
            padding: 12px 0;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1050;
            transition: var(--transition);
        }

        .navbar .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .navbar-brand {
            font-weight: 800;
            font-size: 1.3rem;
            color: var(--text-white);
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 8px;
            text-transform: uppercase;
        }

        .navbar-brand i {
            color: var(--accent-orange);
            font-size: 1.8rem;
        }

        .navbar-toggler {
            background: none;
            border: 1px solid var(--border-color);
            color: var(--text-white);
            padding: 8px 12px;
            border-radius: var(--radius);
            font-size: 1.2rem;
            cursor: pointer;
            display: none;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 30px;
        }

        .nav-links a {
            color: var(--text-warm-gray);
            font-weight: 600;
            font-size: 0.95rem;
            position: relative;
            transition: var(--transition);
            white-space: nowrap;
        }

        .nav-links a:hover,
        .nav-links a.active {
            color: var(--accent-orange);
        }

        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: -6px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--accent-orange);
            border-radius: 2px;
        }

        .nav-buttons {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .btn-login {
            background: transparent;
            color: var(--text-white);
            border: 1px solid var(--border-color);
            padding: 8px 18px;
            border-radius: var(--radius);
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }

        .btn-login:hover {
            border-color: var(--accent-orange);
            color: var(--accent-orange);
        }

        .btn-signup {
            background: linear-gradient(135deg, var(--accent-orange), var(--accent-fire));
            color: #fff;
            border: none;
            padding: 8px 20px;
            border-radius: var(--radius);
            font-weight: 700;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 4px 15px rgba(255, 69, 0, 0.4);
            white-space: nowrap;
        }

        .btn-signup:hover {
            box-shadow: 0 6px 25px rgba(255, 69, 0, 0.6);
            transform: translateY(-2px);
            color: #fff;
        }

        /* Category Hero */
        .category-hero {
            position: relative;
            padding: 140px 0 80px;
            background: linear-gradient(135deg, rgba(0, 0, 0, 0.85) 0%, rgba(22, 22, 22, 0.95) 100%), url('/assets/images/backpic/back-2.jpg') center/cover no-repeat;
            min-height: 75vh;
            display: flex;
            align-items: center;
            overflow: hidden;
        }

        .category-hero .container {
            display: flex;
            align-items: center;
            gap: 60px;
            position: relative;
            z-index: 2;
        }

        .hero-text {
            flex: 0 0 45%;
            max-width: 45%;
        }

        .hero-visual {
            flex: 0 0 55%;
            max-width: 55%;
            position: relative;
            transform: skewY(3deg);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-glow);
            border: 1px solid rgba(255, 69, 0, 0.4);
        }

        .hero-visual img {
            width: 100%;
            height: auto;
            display: block;
            object-fit: cover;
            transform: skewY(-3deg) scale(1.05);
        }

        .category-badge {
            display: inline-block;
            background: rgba(255, 69, 0, 0.15);
            color: var(--accent-orange);
            padding: 8px 20px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 0.9rem;
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 20px;
            border: 1px solid rgba(255, 69, 0, 0.3);
        }

        .hero-text h1 {
            font-family: var(--font-heading);
            font-weight: 800;
            font-size: 2.8rem;
            line-height: 1.2;
            margin-bottom: 20px;
            color: var(--text-white);
        }

        .hero-text h1 span {
            color: var(--accent-orange);
        }

        .hero-text .lead {
            font-size: 1.1rem;
            color: var(--text-warm-gray);
            margin-bottom: 30px;
            line-height: 1.7;
        }

        .hero-kpi-row {
            display: flex;
            gap: 40px;
            margin-bottom: 30px;
        }

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

        .hero-kpi .kpi-number {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--accent-orange);
            display: block;
        }

        .hero-kpi .kpi-label {
            font-size: 0.9rem;
            color: var(--text-warm-gray);
            margin-top: 4px;
        }

        /* Section Styling */
        .section {
            padding: 80px 0;
        }

        .section-title {
            font-family: var(--font-heading);
            font-weight: 800;
            font-size: 2.2rem;
            margin-bottom: 15px;
            color: var(--text-white);
            text-align: left;
        }

        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-warm-gray);
            margin-bottom: 50px;
            text-align: left;
            line-height: 1.6;
        }

        /* Step Cards */
        .step-list {
            display: flex;
            flex-direction: column;
            gap: 30px;
        }

        .step-item {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 30px 35px;
            display: flex;
            gap: 25px;
            align-items: flex-start;
            transition: var(--transition);
        }

        .step-item:hover {
            border-color: var(--accent-orange);
            box-shadow: var(--shadow-glow);
            transform: translateX(5px);
        }

        .step-number {
            flex-shrink: 0;
            width: 55px;
            height: 55px;
            background: linear-gradient(135deg, var(--accent-orange), var(--accent-fire));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 1.5rem;
            color: #fff;
            box-shadow: 0 4px 15px rgba(255, 69, 0, 0.4);
        }

        .step-content h4 {
            font-weight: 700;
            font-size: 1.3rem;
            margin-bottom: 8px;
            color: var(--text-white);
        }

        .step-content p {
            color: var(--text-warm-gray);
            margin-bottom: 0;
            line-height: 1.6;
        }

        /* Hand Rankings Table */
        .hand-table-wrapper {
            overflow-x: auto;
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 25px;
        }

        .hand-table {
            width: 100%;
            border-collapse: separate;
            border-spacing: 0;
            color: var(--text-white);
        }

        .hand-table th {
            background: var(--secondary-bg);
            color: var(--accent-orange);
            font-weight: 700;
            padding: 14px 18px;
            text-align: left;
            border-bottom: 2px solid var(--accent-orange);
        }

        .hand-table td {
            padding: 14px 18px;
            border-bottom: 1px solid var(--border-color);
            color: var(--text-warm-gray);
            vertical-align: middle;
        }

        .hand-table tr:hover td {
            background: rgba(255, 69, 0, 0.05);
            color: var(--text-white);
        }

        .rank-badge {
            display: inline-block;
            background: linear-gradient(135deg, var(--accent-orange), var(--accent-fire));
            color: #fff;
            padding: 4px 12px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 0.85rem;
        }

        /* Strategy Cards */
        .strategy-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 25px;
        }

        .strategy-card {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 30px;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }

        .strategy-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--accent-orange), var(--accent-fire));
            transform: scaleX(0);
            transform-origin: left;
            transition: transform 0.3s ease;
        }

        .strategy-card:hover::before {
            transform: scaleX(1);
        }

        .strategy-card:hover {
            border-color: var(--accent-orange);
            box-shadow: var(--shadow-glow);
            transform: translateY(-5px);
        }

        .strategy-icon {
            font-size: 2.5rem;
            color: var(--accent-orange);
            margin-bottom: 18px;
        }

        .strategy-card h4 {
            font-weight: 700;
            font-size: 1.2rem;
            margin-bottom: 10px;
            color: var(--text-white);
        }

        .strategy-card p {
            color: var(--text-warm-gray);
            margin-bottom: 0;
            line-height: 1.6;
        }

        /* FAQ */
        .faq-section {
            background: var(--secondary-bg);
            border-radius: var(--radius-lg);
            padding: 50px;
        }

        .accordion-item {
            background: transparent;
            border: 1px solid var(--border-color);
            border-radius: var(--radius) !important;
            margin-bottom: 12px;
            overflow: hidden;
        }

        .accordion-button {
            background: var(--card-bg);
            color: var(--text-white);
            font-weight: 700;
            padding: 20px 25px;
            box-shadow: none;
            border-radius: var(--radius) !important;
            transition: var(--transition);
        }

        .accordion-button:not(.collapsed) {
            background: rgba(255, 69, 0, 0.1);
            color: var(--accent-orange);
            box-shadow: none;
        }

        .accordion-button:focus {
            border-color: var(--accent-orange);
            box-shadow: 0 0 0 3px rgba(255, 69, 0, 0.2);
        }

        .accordion-body {
            background: var(--card-bg);
            color: var(--text-warm-gray);
            padding: 20px 25px;
            line-height: 1.6;
        }

        /* CTA */
        .cta-section {
            background: linear-gradient(135deg, rgba(255, 69, 0, 0.1) 0%, rgba(255, 0, 0, 0.05) 100%);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 60px 40px;
            text-align: center;
        }

        .cta-section h2 {
            font-weight: 800;
            font-size: 2rem;
            margin-bottom: 15px;
        }

        .cta-section .btn-cta {
            background: linear-gradient(135deg, var(--accent-orange), var(--accent-fire));
            color: #fff;
            border: none;
            padding: 14px 40px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 1.1rem;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 6px 25px rgba(255, 69, 0, 0.5);
            display: inline-block;
            margin-top: 25px;
        }

        .cta-section .btn-cta:hover {
            box-shadow: 0 10px 35px rgba(255, 69, 0, 0.7);
            transform: translateY(-3px);
            color: #fff;
        }

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

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-brand {
            font-weight: 800;
            font-size: 1.5rem;
            color: var(--accent-orange);
            margin-bottom: 12px;
        }

        .footer p {
            color: var(--text-warm-gray);
            font-size: 0.95rem;
            line-height: 1.6;
            margin-bottom: 0;
        }

        .footer-links h5,
        .footer h5 {
            color: var(--text-white);
            font-weight: 700;
            margin-bottom: 16px;
            font-size: 1.1rem;
        }

        .footer-links ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .footer-links ul li {
            margin-bottom: 10px;
        }

        .footer-links ul li a {
            color: var(--text-warm-gray);
            font-size: 0.95rem;
            transition: var(--transition);
        }

        .footer-links ul li a:hover {
            color: var(--accent-orange);
            padding-left: 5px;
        }

        .footer-bottom {
            border-top: 1px solid var(--border-color);
            padding-top: 25px;
            text-align: center;
            color: var(--text-warm-gray);
            font-size: 0.9rem;
        }
.fixed-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 800;
    font-size: 1.2rem;
    color: var(--text-white);
    text-transform: uppercase;
}
.fixed-brand i {
    color: var(--accent-orange);
    font-size: 1.6rem;
}

        /* Responsive */
        @media (max-width: 1024px) {
            .category-hero .container {
                flex-direction: column;
                gap: 40px;
            }
            .hero-text,
            .hero-visual {
                flex: 0 0 100%;
                max-width: 100%;
            }
            .hero-visual {
                transform: skewY(0);
            }
            .hero-visual img {
                transform: skewY(0) scale(1);
            }
            .hero-text h1 {
                font-size: 2.2rem;
            }
            .strategy-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .navbar-toggler {
                display: block;
            }
            .nav-links {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: rgba(11, 11, 11, 0.98);
                flex-direction: column;
                padding: 20px;
                gap: 16px;
                border-bottom: 1px solid var(--border-color);
            }
            .nav-links.show {
                display: flex;
            }
            .section {
                padding: 50px 0;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .strategy-grid {
                grid-template-columns: 1fr;
            }
            .hero-kpi-row {
                flex-wrap: wrap;
                gap: 20px;
            }
            .hero-text h1 {
                font-size: 1.9rem;
            }
            .faq-section {
                padding: 30px 20px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 25px;
            }
            .category-hero {
                padding: 120px 0 50px;
                min-height: auto;
            }
            .step-item {
                flex-direction: column;
                gap: 15px;
            }
        }

        @media (max-width: 520px) {
            .btn-login,
            .btn-signup {
                padding: 6px 12px;
                font-size: 0.8rem;
            }
            .hero-text h1 {
                font-size: 1.6rem;
            }
            .cta-section {
                padding: 40px 20px;
            }
            .cta-section h2 {
                font-size: 1.4rem;
            }
        }

/* roulang page: category3 */
:root {
            --primary-bg: #0B0B0B;
            --secondary-bg: #161616;
            --accent-orange: #FF4500;
            --accent-fire: #FF0000;
            --text-white: #FFFFFF;
            --text-warm-gray: #CCCCCC;
            --border-color: #2A2A2A;
            --card-bg: #1A1A1A;
            --shadow-glow: 0 0 20px rgba(255, 69, 0, 0.3);
            --shadow-hover: 0 8px 30px rgba(255, 69, 0, 0.5);
            --radius: 12px;
            --radius-lg: 20px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-heading: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            --font-body: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        * {
            box-sizing: border-box;
        }

        body {
            margin: 0;
            font-family: var(--font-body);
            line-height: 1.6;
            background-color: var(--primary-bg);
            color: var(--text-white);
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            transition: var(--transition);
            color: var(--accent-orange);
        }

        a:hover {
            color: var(--accent-fire);
        }

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

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        /* Navbar */
        .navbar {
            background-color: rgba(11, 11, 11, 0.95);
            backdrop-filter: blur(15px);
            border-bottom: 1px solid var(--border-color);
            padding: 12px 0;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1050;
            transition: var(--transition);
        }

        .navbar .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .navbar-brand {
            font-weight: 800;
            font-size: 1.3rem;
            color: var(--text-white);
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 8px;
            text-transform: uppercase;
        }

        .navbar-brand i {
            color: var(--accent-orange);
            font-size: 1.8rem;
        }

        .navbar-toggler {
            background: none;
            border: 1px solid var(--border-color);
            color: var(--text-white);
            padding: 8px 12px;
            border-radius: var(--radius);
            font-size: 1.2rem;
            cursor: pointer;
            display: none;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 30px;
        }

        .nav-links a {
            color: var(--text-warm-gray);
            font-weight: 600;
            font-size: 0.95rem;
            position: relative;
            transition: var(--transition);
            white-space: nowrap;
        }

        .nav-links a:hover,
        .nav-links a.active {
            color: var(--accent-orange);
        }

        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: -6px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--accent-orange);
            border-radius: 2px;
        }

        .nav-buttons {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .btn-login {
            background: transparent;
            color: var(--text-white);
            border: 1px solid var(--border-color);
            padding: 8px 18px;
            border-radius: var(--radius);
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }

        .btn-login:hover {
            border-color: var(--accent-orange);
            color: var(--accent-orange);
        }

        .btn-signup {
            background: linear-gradient(135deg, var(--accent-orange), var(--accent-fire));
            color: #fff;
            border: none;
            padding: 8px 20px;
            border-radius: var(--radius);
            font-weight: 700;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 4px 15px rgba(255, 69, 0, 0.4);
            white-space: nowrap;
        }

        .btn-signup:hover {
            box-shadow: 0 6px 25px rgba(255, 69, 0, 0.6);
            transform: translateY(-2px);
            color: #fff;
        }

        /* Page Header */
        .page-header {
            background: linear-gradient(135deg, rgba(0,0,0,0.8) 0%, rgba(22,22,22,0.9) 100%), url('/assets/images/backpic/back-2.jpg') center/cover no-repeat;
            padding: 140px 0 80px;
            text-align: left;
            position: relative;
            border-bottom: 2px solid var(--accent-orange);
        }

        .page-header h1 {
            font-family: var(--font-heading);
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 16px;
            line-height: 1.3;
        }

        .page-header .highlight {
            color: var(--accent-orange);
        }

        .page-header p {
            font-size: 1.15rem;
            color: var(--text-warm-gray);
            max-width: 700px;
        }

        .breadcrumb-custom {
            list-style: none;
            padding: 0;
            display: flex;
            gap: 8px;
            margin-bottom: 20px;
            color: var(--text-warm-gray);
            font-size: 0.9rem;
        }

        .breadcrumb-custom a {
            color: var(--text-warm-gray);
        }

        .breadcrumb-custom a:hover {
            color: var(--accent-orange);
        }

        .breadcrumb-custom .active-bread {
            color: var(--accent-orange);
            font-weight: 600;
        }

        /* Section Styles */
        .section {
            padding: 80px 0;
        }

        .section-title {
            font-family: var(--font-heading);
            font-size: 2.2rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 12px;
            text-align: left;
        }

        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-warm-gray);
            margin-bottom: 40px;
            text-align: left;
            max-width: 600px;
        }

        /* Data Grid */
        .data-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            margin-bottom: 60px;
        }

        .data-card {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 30px 24px;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }

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

        .data-card .data-icon {
            font-size: 2.4rem;
            color: var(--accent-orange);
            margin-bottom: 16px;
        }

        .data-card .data-number {
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 8px;
        }

        .data-card .data-label {
            color: var(--text-warm-gray);
            font-size: 1rem;
            font-weight: 500;
        }

        .data-card .data-trend {
            display: inline-block;
            padding: 4px 12px;
            background: rgba(255, 69, 0, 0.2);
            color: var(--accent-orange);
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 600;
            margin-top: 12px;
        }

        /* Strategy Matrix */
        .matrix-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }

        .matrix-item {
            background: var(--secondary-bg);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 30px;
            transition: var(--transition);
            display: flex;
            gap: 20px;
            align-items: flex-start;
        }

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

        .matrix-icon {
            width: 60px;
            height: 60px;
            background: linear-gradient(135deg, var(--accent-orange), var(--accent-fire));
            border-radius: var(--radius);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            color: #fff;
            flex-shrink: 0;
        }

        .matrix-content h4 {
            font-weight: 700;
            font-size: 1.2rem;
            margin-bottom: 8px;
            color: var(--text-white);
        }

        .matrix-content p {
            color: var(--text-warm-gray);
            font-size: 0.95rem;
            margin: 0;
        }

        .matrix-tag {
            display: inline-block;
            padding: 4px 12px;
            background: rgba(255, 69, 0, 0.15);
            color: var(--accent-orange);
            border-radius: 6px;
            font-size: 0.8rem;
            font-weight: 700;
            text-transform: uppercase;
            margin-top: 10px;
        }

        /* Comparison Table */
        .comparison-table {
            width: 100%;
            border-collapse: separate;
            border-spacing: 0;
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            overflow: hidden;
        }

        .comparison-table th,
        .comparison-table td {
            padding: 18px 20px;
            text-align: left;
            border-bottom: 1px solid var(--border-color);
        }

        .comparison-table th {
            background: var(--secondary-bg);
            font-weight: 700;
            color: var(--accent-orange);
            text-transform: uppercase;
            font-size: 0.85rem;
        }

        .comparison-table td {
            color: var(--text-warm-gray);
            font-size: 0.95rem;
        }

        .comparison-table tr:last-child td {
            border-bottom: none;
        }

        .comparison-table .check-icon {
            color: #32CD32;
            font-weight: 700;
        }

        /* FAQ */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            margin-bottom: 16px;
            overflow: hidden;
            transition: var(--transition);
        }

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

        .faq-question {
            width: 100%;
            text-align: left;
            background: none;
            border: none;
            padding: 22px 24px;
            font-weight: 700;
            color: var(--text-white);
            font-size: 1rem;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: var(--transition);
        }

        .faq-question i {
            transition: transform 0.3s ease;
            color: var(--accent-orange);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 24px;
            color: var(--text-warm-gray);
            font-size: 0.95rem;
            line-height: 1.7;
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }

        /* CTA Banner */
        .cta-banner {
            background: linear-gradient(135deg, var(--accent-orange), var(--accent-fire));
            border-radius: var(--radius-lg);
            padding: 50px 40px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 30px;
            flex-wrap: wrap;
        }

        .cta-banner h3 {
            font-weight: 800;
            font-size: 1.8rem;
            color: #fff;
            margin: 0;
        }

        .cta-banner p {
            color: rgba(255,255,255,0.9);
            margin: 8px 0 0;
            font-size: 1rem;
        }

        .btn-cta-white {
            background: #fff;
            color: var(--accent-orange);
            border: none;
            padding: 14px 32px;
            border-radius: var(--radius);
            font-weight: 800;
            font-size: 1rem;
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }

        .btn-cta-white:hover {
            background: var(--primary-bg);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(0,0,0,0.3);
        }

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

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 30px;
        }

        .footer-brand {
            font-weight: 800;
            font-size: 1.4rem;
            color: var(--text-white);
            margin-bottom: 12px;
        }

        .footer p {
            color: var(--text-warm-gray);
            font-size: 0.9rem;
        }

        .footer h5 {
            color: var(--accent-orange);
            font-weight: 700;
            margin-bottom: 16px;
        }

        .footer-links ul {
            list-style: none;
            padding: 0;
        }

        .footer-links li {
            margin-bottom: 8px;
        }

        .footer-links a {
            color: var(--text-warm-gray);
            font-size: 0.9rem;
        }

        .footer-links a:hover {
            color: var(--accent-orange);
        }

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

        /* Floating Button */
        .fab-left {
            position: fixed;
            left: 20px;
            bottom: 100px;
            z-index: 1000;
            width: 56px;
            height: 56px;
            background: rgba(11, 11, 11, 0.8);
            backdrop-filter: blur(10px);
            border: 2px solid transparent;
            background-clip: padding-box;
            border-radius: 50px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-orange);
            font-size: 1.4rem;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 0 15px rgba(255, 69, 0, 0.5);
            animation: neonPulse 2s infinite;
        }

        @keyframes neonPulse {
            0%, 100% { box-shadow: 0 0 15px rgba(255, 69, 0, 0.5); }
            50% { box-shadow: 0 0 30px rgba(255, 69, 0, 0.9); }
        }

        .fab-left:hover {
            transform: scale(1.1);
            border-color: var(--accent-orange);
            box-shadow: 0 0 35px rgba(255, 69, 0, 1);
            color: #fff;
            background: var(--accent-orange);
        }

        @media (max-width: 992px) {
            .page-header h1 {
                font-size: 2rem;
            }
            .data-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .matrix-grid {
                grid-template-columns: 1fr;
            }
            .cta-banner {
                flex-direction: column;
                text-align: center;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 768px) {
            .navbar-toggler {
                display: block;
            }
            .nav-links {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: rgba(11, 11, 11, 0.98);
                flex-direction: column;
                padding: 20px;
                gap: 16px;
                border-bottom: 1px solid var(--border-color);
            }
            .nav-links.show {
                display: flex;
            }
            .nav-buttons {
                gap: 8px;
            }
            .btn-login,
            .btn-signup {
                padding: 6px 14px;
                font-size: 0.85rem;
            }
            .data-grid {
                grid-template-columns: 1fr;
            }
            .page-header {
                padding: 120px 0 60px;
            }
            .page-header h1 {
                font-size: 1.8rem;
            }
            .section-title {
                font-size: 1.6rem;
            }
            .comparison-table {
                font-size: 0.85rem;
            }
            .comparison-table th,
            .comparison-table td {
                padding: 12px 10px;
            }
        }

/* roulang page: category4 */
:root {
            --primary-bg: #0B0B0B;
            --secondary-bg: #161616;
            --accent-orange: #FF4500;
            --accent-fire: #FF0000;
            --text-white: #FFFFFF;
            --text-warm-gray: #CCCCCC;
            --border-color: #2A2A2A;
            --card-bg: #1A1A1A;
            --shadow-glow: 0 0 20px rgba(255, 69, 0, 0.3);
            --shadow-hover: 0 8px 30px rgba(255, 69, 0, 0.5);
            --radius: 12px;
            --radius-lg: 20px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-heading: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            --font-body: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        * {
            box-sizing: border-box;
        }
        body {
            margin: 0;
            font-family: var(--font-body);
            line-height: 1.6;
            background-color: var(--primary-bg);
            color: var(--text-white);
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            transition: var(--transition);
        }
        img {
            max-width: 100%;
            height: auto;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 20px;
            padding-right: 20px;
        }
        h1, h2, h3, h4, h5 {
            font-family: var(--font-heading);
            font-weight: 700;
            line-height: 1.3;
        }
        h1 {
            font-size: 2.8rem;
            margin-bottom: 1rem;
        }
        h2 {
            font-size: 2.2rem;
            margin-bottom: 2rem;
            position: relative;
        }
        h2::after {
            content: '';
            display: block;
            width: 60px;
            height: 4px;
            background: linear-gradient(90deg, var(--accent-orange), var(--accent-fire));
            margin-top: 12px;
            border-radius: 2px;
        }
        h3 {
            font-size: 1.6rem;
            margin-bottom: 1rem;
        }
        /* Navbar */
        .navbar {
            background-color: rgba(11, 11, 11, 0.95);
            backdrop-filter: blur(15px);
            border-bottom: 1px solid var(--border-color);
            padding: 12px 0;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1050;
            transition: var(--transition);
        }
        .navbar .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.3rem;
            color: var(--text-white);
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 8px;
            text-transform: uppercase;
        }
        .navbar-brand i {
            color: var(--accent-orange);
            font-size: 1.8rem;
        }
        .navbar-toggler {
            background: none;
            border: 1px solid var(--border-color);
            color: var(--text-white);
            padding: 8px 12px;
            border-radius: var(--radius);
            font-size: 1.2rem;
            cursor: pointer;
            display: none;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 30px;
        }
        .nav-links a {
            color: var(--text-warm-gray);
            font-weight: 600;
            font-size: 0.95rem;
            position: relative;
            transition: var(--transition);
            white-space: nowrap;
        }
        .nav-links a:hover,
        .nav-links a.active {
            color: var(--accent-orange);
        }
        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: -6px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--accent-orange);
            border-radius: 2px;
        }
        .nav-buttons {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .btn-login {
            background: transparent;
            color: var(--text-white);
            border: 1px solid var(--border-color);
            padding: 8px 18px;
            border-radius: var(--radius);
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }
        .btn-login:hover {
            border-color: var(--accent-orange);
            color: var(--accent-orange);
        }
        .btn-signup {
            background: linear-gradient(135deg, var(--accent-orange), var(--accent-fire));
            color: #fff;
            border: none;
            padding: 8px 20px;
            border-radius: var(--radius);
            font-weight: 700;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 4px 15px rgba(255, 69, 0, 0.4);
            white-space: nowrap;
        }
        .btn-signup:hover {
            box-shadow: 0 6px 25px rgba(255, 69, 0, 0.6);
            transform: translateY(-2px);
            color: #fff;
        }
        /* Hero Short Banner */
        .hero-short {
            background: linear-gradient(135deg, rgba(22,22,22,0.95) 0%, rgba(11,11,11,0.98) 100%), url('/assets/images/backpic/back-2.jpg') center/cover no-repeat;
            padding: 120px 0 60px;
            border-bottom: 2px solid var(--accent-orange);
            text-align: left;
        }
        .hero-short .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 40px;
            flex-wrap: wrap;
        }
        .hero-text {
            flex: 1;
            min-width: 280px;
        }
        .hero-text h1 {
            font-size: 2.8rem;
            background: linear-gradient(135deg, #FFFFFF, #FFAA66);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-text p {
            color: var(--text-warm-gray);
            font-size: 1.1rem;
        }
        .hero-img {
            flex: 0 0 320px;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-glow);
        }
        .hero-img img {
            display: block;
            width: 100%;
            height: auto;
        }
        /* Section Spacing */
        .section {
            padding: 70px 0;
        }
        .section-dark {
            background-color: var(--secondary-bg);
        }
        /* Stats Row */
        .stats-row {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 24px;
            margin: 30px 0;
        }
        .stat-card {
            background: var(--card-bg);
            padding: 28px 24px;
            border-radius: var(--radius);
            border-left: 4px solid var(--accent-orange);
            transition: var(--transition);
        }
        .stat-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-3px);
        }
        .stat-number {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--accent-orange);
            display: block;
            line-height: 1.2;
        }
        .stat-label {
            color: var(--text-warm-gray);
            font-size: 0.95rem;
            margin-top: 8px;
        }
        /* Feature Grid */
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
            margin-top: 40px;
        }
        .feature-item {
            background: var(--card-bg);
            padding: 30px;
            border-radius: var(--radius);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .feature-item:hover {
            border-color: var(--accent-orange);
            box-shadow: 0 6px 25px rgba(255,69,0,0.2);
            transform: translateY(-5px);
        }
        .feature-icon {
            font-size: 2.4rem;
            color: var(--accent-orange);
            margin-bottom: 16px;
        }
        .feature-item h3 {
            font-size: 1.4rem;
            margin-bottom: 12px;
        }
        .feature-item p {
            color: var(--text-warm-gray);
            font-size: 0.95rem;
        }
        /* Step Timeline */
        .steps-list {
            display: grid;
            grid-template-columns: 1fr;
            gap: 24px;
            margin-top: 40px;
        }
        .step-item {
            display: flex;
            gap: 24px;
            align-items: flex-start;
            background: var(--card-bg);
            padding: 24px;
            border-radius: var(--radius);
            border-left: 4px solid var(--accent-orange);
            transition: var(--transition);
        }
        .step-item:hover {
            box-shadow: 0 6px 20px rgba(255,69,0,0.25);
        }
        .step-number {
            background: linear-gradient(135deg, var(--accent-orange), var(--accent-fire));
            color: #fff;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            font-weight: 800;
            flex-shrink: 0;
        }
        .step-content h3 {
            margin-top: 0;
            font-size: 1.3rem;
        }
        .step-content p {
            color: var(--text-warm-gray);
            margin-bottom: 0;
        }
        /* Comparison Table */
        .compare-table-wrap {
            overflow-x: auto;
            margin-top: 40px;
        }
        .compare-table {
            width: 100%;
            border-collapse: collapse;
            min-width: 600px;
        }
        .compare-table th {
            background: var(--accent-orange);
            color: #fff;
            padding: 14px 18px;
            text-align: left;
            font-weight: 700;
            font-size: 0.95rem;
        }
        .compare-table td {
            padding: 14px 18px;
            border-bottom: 1px solid var(--border-color);
            color: var(--text-warm-gray);
            font-size: 0.95rem;
        }
        .compare-table tr:hover td {
            background: rgba(255,69,0,0.05);
        }
        .badge-yes {
            color: #32CD32;
            font-weight: 700;
        }
        .badge-no {
            color: #FF4500;
            font-weight: 700;
        }
        /* FAQ */
        .faq-list {
            margin-top: 40px;
        }
        .faq-item {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            margin-bottom: 16px;
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--accent-orange);
        }
        .faq-question {
            padding: 18px 24px;
            cursor: pointer;
            font-weight: 700;
            font-size: 1.05rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: var(--text-white);
            background: transparent;
            border: none;
            width: 100%;
            text-align: left;
        }
        .faq-question i {
            transition: var(--transition);
            color: var(--accent-orange);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            background: rgba(22,22,22,0.8);
        }
        .faq-answer p {
            padding: 0 24px;
            margin: 0;
            color: var(--text-warm-gray);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 16px 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        /* CTA */
        .cta-section {
            background: linear-gradient(135deg, var(--accent-orange) 0%, #B22200 100%);
            padding: 60px 0;
            text-align: center;
        }
        .cta-section h2 {
            color: #fff;
            margin-bottom: 16px;
        }
        .cta-section h2::after {
            background: #fff;
            margin: 12px auto 0;
        }
        .cta-section p {
            color: rgba(255,255,255,0.9);
            font-size: 1.1rem;
            margin-bottom: 24px;
        }
        .btn-cta-large {
            background: #fff;
            color: var(--accent-orange);
            border: none;
            padding: 14px 40px;
            border-radius: 50px;
            font-weight: 800;
            font-size: 1.1rem;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 8px 25px rgba(0,0,0,0.3);
        }
        .btn-cta-large:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 35px rgba(0,0,0,0.4);
        }
        /* Footer */
        .footer {
            background: var(--secondary-bg);
            border-top: 2px solid var(--border-color);
            padding: 50px 0 20px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand {
            font-size: 1.6rem;
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 12px;
            text-transform: uppercase;
        }
        .footer p {
            color: var(--text-warm-gray);
            font-size: 0.95rem;
        }
        .footer-links h5,
        .footer h5 {
            color: var(--accent-orange);
            font-weight: 700;
            margin-bottom: 16px;
        }
        .footer-links ul {
            list-style: none;
            padding: 0;
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .footer-links a {
            color: var(--text-warm-gray);
            font-size: 0.95rem;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: var(--accent-orange);
            padding-left: 6px;
        }
        .footer-bottom {
            border-top: 1px solid var(--border-color);
            padding-top: 20px;
            text-align: center;
            font-size: 0.85rem;
            color: var(--text-warm-gray);
        }
        /* FAB Left */
        .fab-left {
            position: fixed;
            left: 16px;
            bottom: 96px;
            z-index: 1040;
            width: 52px;
            height: 52px;
            background: rgba(11,11,11,0.7);
            backdrop-filter: blur(10px);
            border: 2px solid transparent;
            border-image: linear-gradient(135deg, #00F0FF, #FF4500) 1;
            border-radius: 50px;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 0 18px rgba(0,240,255,0.35);
            opacity: 0.7;
        }
        .fab-left i {
            font-size: 1.5rem;
            color: #00F0FF;
            transition: var(--transition);
        }
        .fab-left:hover {
            opacity: 1;
            transform: scale(1.1);
            box-shadow: 0 0 28px rgba(0,240,255,0.55);
        }
        /* Responsive */
        @media (max-width: 992px) {
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            .hero-short .container {
                flex-direction: column;
                text-align: center;
            }
            .hero-img {
                flex: 0 0 auto;
                max-width: 300px;
                margin: 20px auto 0;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 768px) {
            .navbar-toggler {
                display: block;
            }
            .nav-links {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: rgba(11, 11, 11, 0.98);
                flex-direction: column;
                padding: 20px;
                gap: 16px;
                border-bottom: 1px solid var(--border-color);
            }
            .nav-links.show {
                display: flex;
            }
            .nav-buttons {
                gap: 8px;
            }
            .btn-login,
            .btn-signup {
                padding: 6px 14px;
                font-size: 0.85rem;
            }
            h1 {
                font-size: 1.9rem;
            }
            h2 {
                font-size: 1.6rem;
            }
            .stats-row {
                grid-template-columns: 1fr 1fr;
            }
            .feature-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .fab-left {
                bottom: 80px;
                left: 12px;
                width: 46px;
                height: 46px;
            }
        }
        @media (max-width: 520px) {
            .stats-row {
                grid-template-columns: 1fr;
            }
            .hero-short {
                padding: 100px 0 40px;
            }
            .step-item {
                flex-direction: column;
                gap: 12px;
            }
        }