/* roulang page: index */
:root {
            --primary: #e63946;
            --primary-hover: #c1121f;
            --primary-glow: rgba(230, 57, 70, 0.35);
            --accent: #f0a500;
            --accent-hover: #d49100;
            --bg-deep: #08080c;
            --bg-dark: #0f0f16;
            --bg-card: #181820;
            --bg-card-hover: #1e1e28;
            --bg-nav: rgba(10, 10, 18, 0.88);
            --bg-section-alt: #0c0c14;
            --text: #f0f0f2;
            --text-heading: #ffffff;
            --text-muted: #9a9aa6;
            --text-weak: #6b6b78;
            --border: #252530;
            --border-light: #2e2e3a;
            --radius-sm: 8px;
            --radius: 12px;
            --radius-lg: 18px;
            --radius-xl: 24px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.35);
            --shadow-lg: 0 8px 36px rgba(0, 0, 0, 0.5);
            --shadow-glow: 0 0 40px var(--primary-glow);
            --transition-fast: 0.18s ease;
            --transition: 0.28s ease;
            --transition-slow: 0.4s ease;
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, sans-serif;
            --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
            --max-width: 1200px;
            --nav-height: 68px;
            --section-gap: 80px;
            --section-gap-mobile: 48px;
        }

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

        html {
            scroll-behavior: smooth;
            scroll-padding-top: var(--nav-height);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background-color: var(--bg-deep);
            min-height: 100vh;
            overflow-x: hidden;
            -webkit-tap-highlight-color: transparent;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        a:hover {
            color: var(--primary);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button {
            cursor: pointer;
            font-family: inherit;
            border: none;
            outline: none;
        }
        button:focus-visible,
        a:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 3px;
            border-radius: 4px;
        }
        input {
            font-family: inherit;
            outline: none;
        }
        ul {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-family: var(--font-heading);
            font-weight: 700;
            line-height: 1.25;
            color: var(--text-heading);
        }
        h1 {
            font-size: clamp(2.2rem, 5vw, 3.6rem);
            letter-spacing: -0.02em;
        }
        h2 {
            font-size: clamp(1.7rem, 3.5vw, 2.5rem);
            letter-spacing: -0.01em;
        }
        h3 {
            font-size: clamp(1.2rem, 2.2vw, 1.5rem);
        }
        p {
            color: var(--text-muted);
        }

        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }

        /* ========== HEADER / NAV ========== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--nav-height);
            background: var(--bg-nav);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border);
            transition: background var(--transition), box-shadow var(--transition);
        }
        .site-header.scrolled {
            box-shadow: var(--shadow);
            background: rgba(8, 8, 14, 0.95);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--text-heading);
            letter-spacing: -0.01em;
            white-space: nowrap;
            z-index: 1001;
        }
        .logo-icon {
            width: 38px;
            height: 38px;
            border-radius: var(--radius-sm);
            background: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            color: #fff;
            flex-shrink: 0;
        }
        .logo:hover {
            color: var(--text-heading);
        }
        .logo:hover .logo-icon {
            background: var(--primary-hover);
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .nav-links a {
            display: inline-block;
            padding: 10px 16px;
            border-radius: 8px;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-muted);
            transition: all var(--transition-fast);
            white-space: nowrap;
            position: relative;
        }
        .nav-links a:hover,
        .nav-links a.active {
            color: var(--text-heading);
            background: rgba(255, 255, 255, 0.04);
        }
        .nav-links a.nav-cta-btn {
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            padding: 10px 20px;
            border-radius: 22px;
            margin-left: 8px;
            transition: all var(--transition);
        }
        .nav-links a.nav-cta-btn:hover {
            background: var(--primary-hover);
            color: #fff;
            box-shadow: var(--shadow-glow);
            transform: translateY(-1px);
        }
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            padding: 8px;
            z-index: 1001;
            border-radius: 6px;
        }
        .hamburger span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--text);
            border-radius: 2px;
            transition: all var(--transition-fast);
            transform-origin: center;
        }
        .hamburger.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        @media (max-width: 860px) {
            .nav-links {
                position: fixed;
                top: 0;
                right: -100%;
                width: 280px;
                height: 100vh;
                background: var(--bg-dark);
                flex-direction: column;
                padding: 90px 28px 40px;
                gap: 4px;
                transition: right var(--transition-slow);
                box-shadow: var(--shadow-lg);
                border-left: 1px solid var(--border);
                overflow-y: auto;
            }
            .nav-links.open {
                right: 0;
            }
            .nav-links a {
                display: block;
                padding: 14px 16px;
                font-size: 1.05rem;
                border-radius: 10px;
            }
            .nav-links a.nav-cta-btn {
                margin-left: 0;
                margin-top: 12px;
                text-align: center;
                border-radius: 10px;
            }
            .hamburger {
                display: flex;
            }
            .mobile-overlay {
                display: none;
                position: fixed;
                inset: 0;
                background: rgba(0, 0, 0, 0.55);
                z-index: 999;
                transition: opacity var(--transition);
            }
            .mobile-overlay.show {
                display: block;
            }
        }
        @media (max-width: 520px) {
            .header-inner {
                padding: 0 14px;
            }
            .logo {
                font-size: 1.25rem;
                gap: 7px;
            }
            .logo-icon {
                width: 32px;
                height: 32px;
                font-size: 1rem;
            }
            .nav-links {
                width: 100%;
                right: -100%;
            }
        }

        /* ========== HERO ========== */
        .hero {
            position: relative;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 120px 24px 80px;
            overflow: hidden;
            background-color: var(--bg-deep);
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
            z-index: 0;
            opacity: 0.55;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(8, 8, 12, 0.75) 0%, rgba(8, 8, 12, 0.9) 60%, rgba(8, 8, 12, 0.98) 100%);
            z-index: 1;
        }
        .hero-glow {
            position: absolute;
            width: 500px;
            height: 500px;
            border-radius: 50%;
            background: radial-gradient(circle, var(--primary-glow) 0%, transparent 70%);
            top: 20%;
            left: 50%;
            transform: translate(-50%, -30%);
            z-index: 1;
            pointer-events: none;
            animation: heroGlowPulse 4s ease-in-out infinite;
        }
        @keyframes heroGlowPulse {
            0%,
            100% {
                opacity: 0.6;
                transform: translate(-50%, -30%) scale(1);
            }
            50% {
                opacity: 1;
                transform: translate(-50%, -30%) scale(1.15);
            }
        }
        .hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 800px;
            animation: fadeInUp 0.8s ease-out;
        }
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .hero-badge {
            display: inline-block;
            padding: 7px 18px;
            border-radius: 20px;
            background: rgba(230, 57, 70, 0.15);
            border: 1px solid rgba(230, 57, 70, 0.35);
            color: var(--primary);
            font-size: 0.9rem;
            font-weight: 600;
            margin-bottom: 20px;
            letter-spacing: 0.02em;
        }
        .hero-content h1 {
            margin-bottom: 18px;
            line-height: 1.2;
            text-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
            color: #fff;
        }
        .hero-content h1 .highlight {
            color: var(--primary);
            position: relative;
        }
        .hero-content .hero-subtitle {
            font-size: clamp(1.05rem, 1.8vw, 1.25rem);
            color: var(--text-muted);
            margin-bottom: 32px;
            max-width: 580px;
            margin-left: auto;
            margin-right: auto;
            line-height: 1.6;
        }
        .hero-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            justify-content: center;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 28px;
            border-radius: 28px;
            font-size: 1rem;
            font-weight: 600;
            transition: all var(--transition);
            white-space: nowrap;
            letter-spacing: 0.01em;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 18px var(--primary-glow);
        }
        .btn-primary:hover {
            background: var(--primary-hover);
            box-shadow: 0 6px 28px var(--primary-glow);
            transform: translateY(-2px);
            color: #fff;
        }
        .btn-outline {
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255, 255, 255, 0.3);
        }
        .btn-outline:hover {
            border-color: #fff;
            background: rgba(255, 255, 255, 0.06);
            color: #fff;
            transform: translateY(-2px);
        }
        .btn-accent {
            background: var(--accent);
            color: #1a1a1a;
            font-weight: 700;
        }
        .btn-accent:hover {
            background: var(--accent-hover);
            color: #1a1a1a;
            transform: translateY(-2px);
            box-shadow: 0 4px 18px rgba(240, 165, 0, 0.35);
        }
        .hero-live-indicator {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            margin-top: 28px;
            padding: 10px 18px;
            border-radius: 20px;
            background: rgba(0, 0, 0, 0.4);
            border: 1px solid var(--border-light);
            font-size: 0.9rem;
            color: var(--text-muted);
        }
        .live-dot {
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: #00e676;
            animation: livePulse 1.5s ease-in-out infinite;
        }
        @keyframes livePulse {
            0%,
            100% {
                box-shadow: 0 0 0 0 rgba(0, 230, 118, 0.6);
            }
            50% {
                box-shadow: 0 0 0 14px rgba(0, 230, 118, 0);
            }
        }

        /* ========== SECTIONS ========== */
        section {
            padding: var(--section-gap) 0;
        }
        @media (max-width: 768px) {
            section {
                padding: var(--section-gap-mobile) 0;
            }
        }
        .section-label {
            display: inline-block;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--primary);
            text-transform: uppercase;
            letter-spacing: 0.06em;
            margin-bottom: 10px;
        }
        .section-heading {
            margin-bottom: 14px;
        }
        .section-desc {
            max-width: 600px;
            margin: 0 auto 40px;
            color: var(--text-muted);
            font-size: 1.05rem;
            text-align: center;
        }
        .section-desc.left-align {
            text-align: left;
            margin-left: 0;
        }
        .bg-alt {
            background: var(--bg-section-alt);
        }

        /* ========== FEATURES ========== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        @media (max-width: 1024px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 520px) {
            .features-grid {
                grid-template-columns: 1fr;
            }
        }
        .feature-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            border: 1px solid var(--border);
            transition: all var(--transition);
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .feature-card:hover {
            background: var(--bg-card-hover);
            border-color: var(--border-light);
            transform: translateY(-4px);
            box-shadow: var(--shadow);
        }
        .feature-card .feature-icon {
            width: 56px;
            height: 56px;
            border-radius: var(--radius);
            background: rgba(230, 57, 70, 0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            font-size: 1.5rem;
            color: var(--primary);
            transition: all var(--transition);
        }
        .feature-card:hover .feature-icon {
            background: var(--primary);
            color: #fff;
            box-shadow: var(--shadow-glow);
        }
        .feature-card h3 {
            margin-bottom: 8px;
            font-size: 1.15rem;
        }
        .feature-card p {
            font-size: 0.9rem;
            color: var(--text-weak);
            line-height: 1.5;
        }

        /* ========== SERVICES ========== */
        .services-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 22px;
        }
        @media (max-width: 1024px) {
            .services-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 600px) {
            .services-grid {
                grid-template-columns: 1fr;
                max-width: 420px;
                margin: 0 auto;
            }
        }
        .service-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }
        .service-card:hover {
            border-color: var(--border-light);
            transform: translateY(-4px);
            box-shadow: var(--shadow);
        }
        .service-card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block;
        }
        .service-card-body {
            padding: 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .service-card-body h3 {
            margin-bottom: 6px;
        }
        .service-card-body p {
            font-size: 0.9rem;
            color: var(--text-weak);
            flex: 1;
        }
        .service-card-tag {
            display: inline-block;
            padding: 4px 12px;
            border-radius: 12px;
            font-size: 0.78rem;
            font-weight: 600;
            background: rgba(230, 57, 70, 0.12);
            color: var(--primary);
            margin-top: 12px;
            align-self: flex-start;
        }

        /* ========== STATS ========== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            text-align: center;
        }
        @media (max-width: 768px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 420px) {
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 14px;
            }
        }
        .stat-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 28px 16px;
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .stat-card:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-glow);
            transform: translateY(-2px);
        }
        .stat-number {
            font-size: 2.6rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -0.02em;
            line-height: 1;
            margin-bottom: 6px;
        }
        .stat-label {
            font-size: 0.9rem;
            color: var(--text-muted);
            font-weight: 500;
        }

        /* ========== HOW IT WORKS ========== */
        .steps-list {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            counter-reset: step;
        }
        @media (max-width: 1024px) {
            .steps-list {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 520px) {
            .steps-list {
                grid-template-columns: 1fr;
                max-width: 380px;
                margin: 0 auto;
            }
        }
        .step-item {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 28px 20px;
            border: 1px solid var(--border);
            text-align: center;
            position: relative;
            counter-increment: step;
            transition: all var(--transition);
        }
        .step-item:hover {
            border-color: var(--border-light);
            transform: translateY(-3px);
            box-shadow: var(--shadow);
        }
        .step-item::before {
            content: counter(step);
            display: flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            font-weight: 700;
            font-size: 1.2rem;
            margin: 0 auto 14px;
            transition: all var(--transition);
        }
        .step-item:hover::before {
            box-shadow: var(--shadow-glow);
            transform: scale(1.08);
        }
        .step-item h3 {
            margin-bottom: 6px;
            font-size: 1.1rem;
        }
        .step-item p {
            font-size: 0.88rem;
            color: var(--text-weak);
        }

        /* ========== TESTIMONIALS ========== */
        .testimonials-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        @media (max-width: 900px) {
            .testimonials-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 560px) {
            .testimonials-grid {
                grid-template-columns: 1fr;
                max-width: 400px;
                margin: 0 auto;
            }
        }
        .testimonial-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 24px;
            border: 1px solid var(--border);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .testimonial-card:hover {
            border-color: var(--border-light);
            box-shadow: var(--shadow);
        }
        .testimonial-stars {
            color: var(--accent);
            font-size: 0.9rem;
            letter-spacing: 2px;
        }
        .testimonial-card p {
            font-size: 0.93rem;
            color: var(--text-muted);
            flex: 1;
            font-style: italic;
            line-height: 1.5;
        }
        .testimonial-author {
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--text);
        }
        .testimonial-author span {
            font-weight: 400;
            color: var(--text-weak);
            font-size: 0.82rem;
        }

        /* ========== FAQ ========== */
        .faq-list {
            max-width: 720px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover {
            border-color: var(--border-light);
        }
        .faq-question {
            width: 100%;
            background: none;
            color: var(--text-heading);
            font-size: 1rem;
            font-weight: 600;
            padding: 18px 20px;
            text-align: left;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            transition: all var(--transition-fast);
            cursor: pointer;
            border: none;
            outline: none;
            font-family: inherit;
        }
        .faq-question:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: -2px;
            border-radius: var(--radius);
        }
        .faq-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.05);
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all var(--transition-fast);
            font-size: 0.8rem;
            color: var(--text-muted);
        }
        .faq-item.open .faq-icon {
            background: var(--primary);
            color: #fff;
            transform: rotate(45deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow), padding var(--transition-slow);
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
        }
        .faq-answer-inner {
            padding: 0 20px 18px;
            font-size: 0.93rem;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* ========== CTA ========== */
        .cta-section {
            position: relative;
            background: var(--bg-dark);
            overflow: hidden;
            padding: 80px 0;
        }
        .cta-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
            z-index: 0;
            opacity: 0.3;
        }
        .cta-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(8, 8, 12, 0.9) 0%, rgba(20, 8, 10, 0.85) 100%);
            z-index: 1;
        }
        .cta-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 650px;
            margin: 0 auto;
        }
        .cta-content h2 {
            margin-bottom: 14px;
            color: #fff;
        }
        .cta-content p {
            color: var(--text-muted);
            margin-bottom: 28px;
            font-size: 1.05rem;
        }
        .cta-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            justify-content: center;
        }

        /* ========== FOOTER ========== */
        .site-footer {
            background: var(--bg-deep);
            border-top: 1px solid var(--border);
            padding: 48px 0 28px;
            text-align: center;
        }
        .footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            justify-content: center;
            margin-bottom: 24px;
        }
        .footer-links a {
            font-size: 0.9rem;
            color: var(--text-muted);
            transition: color var(--transition-fast);
        }
        .footer-links a:hover {
            color: var(--primary);
        }
        .footer-copy {
            font-size: 0.82rem;
            color: var(--text-weak);
        }
        .footer-copy strong {
            color: var(--text);
        }

        /* ========== RESPONSIVE UTILS ========== */
        @media (max-width: 768px) {
            .hero {
                min-height: 90vh;
                padding: 100px 16px 60px;
            }
            .hero-content h1 {
                font-size: clamp(1.8rem, 7vw, 2.6rem);
            }
            .btn {
                padding: 12px 22px;
                font-size: 0.95rem;
            }
            .section-heading {
                text-align: center;
            }
            .section-desc {
                text-align: center;
            }
            .section-desc.left-align {
                text-align: center;
            }
        }
        @media (max-width: 520px) {
            .hero-buttons {
                flex-direction: column;
                align-items: center;
            }
            .btn {
                width: 100%;
                max-width: 280px;
                justify-content: center;
            }
            .stat-number {
                font-size: 2rem;
            }
            .feature-card {
                padding: 22px 16px;
            }
        }