/* roulang page: index */
:root {
            --primary: #0A66FF;
            --primary-dark: #084FC4;
            --primary-light: rgba(10, 102, 255, 0.08);
            --primary-glow: rgba(10, 102, 255, 0.15);
            --accent: #FF4F1E;
            --accent-light: rgba(255, 79, 30, 0.1);
            --bg-light: #F7F8FC;
            --bg-white: #FFFFFF;
            --bg-off: #FAFAFB;
            --text-dark: #1A1A2E;
            --text-body: #3D3D56;
            --text-muted: #7B7B93;
            --text-light: #A0A0B8;
            --border-subtle: #E8E9F0;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.04);
            --shadow-lg: 0 16px 40px rgba(10, 102, 255, 0.08);
            --shadow-xl: 0 24px 56px rgba(0, 0, 0, 0.1);
            --radius-xs: 8px;
            --radius-sm: 12px;
            --radius-md: 20px;
            --radius-lg: 24px;
            --radius-xl: 32px;
            --font-h1: 44px;
            --font-h2: 32px;
            --font-h3: 22px;
            --font-h4: 18px;
            --font-body: 16px;
            --font-sm: 13px;
            --container-max: 1280px;
            --gutter: 24px;
            --nav-blur: 12px;
            --transition-fast: 0.2s ease;
            --transition-base: 0.25s ease;
            --transition-slow: 0.35s ease;
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Inter", "Roboto", sans-serif;
            font-size: var(--font-body);
            line-height: 1.7;
            color: var(--text-body);
            background-color: var(--bg-white);
            overflow-x: hidden;
            min-height: 100vh;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition-fast);
        }
        button {
            cursor: pointer;
            border: none;
            font-family: inherit;
            font-size: inherit;
        }
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
        }
        ul {
            list-style: none;
        }

        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 var(--gutter);
            width: 100%;
        }

        /* ========== HEADER / NAV ========== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.88);
            backdrop-filter: blur(var(--nav-blur));
            -webkit-backdrop-filter: blur(var(--nav-blur));
            border-bottom: 1px solid var(--border-subtle);
            transition: all var(--transition-base);
            height: 68px;
        }
        .site-header.scrolled {
            height: 56px;
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo-wrap {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .logo-icon {
            width: 38px;
            height: 38px;
            flex-shrink: 0;
        }
        .logo-text {
            font-size: 20px;
            font-weight: 800;
            color: var(--text-dark);
            letter-spacing: 0.5px;
            white-space: nowrap;
        }
        .logo-text span {
            color: var(--primary);
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 6px;
            list-style: none;
        }
        .nav-links a {
            display: inline-block;
            padding: 8px 16px;
            border-radius: 20px;
            font-weight: 500;
            font-size: 15px;
            color: var(--text-body);
            transition: all var(--transition-fast);
            white-space: nowrap;
        }
        .nav-links a:hover,
        .nav-links a:focus-visible {
            color: var(--primary);
            background: var(--primary-light);
        }
        .nav-cta {
            background: var(--primary) !important;
            color: #fff !important;
            border-radius: var(--radius-sm) !important;
            padding: 10px 22px !important;
            font-weight: 600 !important;
            transition: all var(--transition-base) !important;
            box-shadow: 0 4px 14px rgba(10, 102, 255, 0.3);
        }
        .nav-cta:hover {
            background: var(--primary-dark) !important;
            box-shadow: 0 6px 22px rgba(10, 102, 255, 0.4) !important;
            transform: translateY(-1px);
        }
        .hamburger-btn {
            display: none;
            width: 40px;
            height: 40px;
            background: transparent;
            border-radius: 50%;
            align-items: center;
            justify-content: center;
            flex-direction: column;
            gap: 5px;
            z-index: 1100;
            position: relative;
        }
        .hamburger-btn span {
            display: block;
            width: 22px;
            height: 2px;
            background: var(--text-dark);
            border-radius: 2px;
            transition: all var(--transition-base);
            transform-origin: center;
        }
        .hamburger-btn.active span:nth-child(1) {
            transform: rotate(45deg) translateY(5px);
        }
        .hamburger-btn.active span:nth-child(2) {
            opacity: 0;
            transform: scaleX(0);
        }
        .hamburger-btn.active span:nth-child(3) {
            transform: rotate(-45deg) translateY(-5px);
        }

        /* Mobile nav overlay */
        .mobile-nav-overlay {
            position: fixed;
            inset: 0;
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            z-index: 1050;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 20px;
            opacity: 0;
            pointer-events: none;
            transition: opacity var(--transition-base);
        }
        .mobile-nav-overlay.active {
            opacity: 1;
            pointer-events: auto;
        }
        .mobile-nav-overlay a {
            font-size: 20px;
            font-weight: 600;
            color: var(--text-dark);
            padding: 12px 28px;
            border-radius: 28px;
            transition: all var(--transition-fast);
        }
        .mobile-nav-overlay a:hover {
            color: var(--primary);
            background: var(--primary-light);
        }
        .mobile-nav-overlay .mobile-cta {
            background: var(--primary);
            color: #fff !important;
            padding: 14px 36px;
            border-radius: var(--radius-sm);
            font-weight: 700;
            box-shadow: 0 6px 20px rgba(10, 102, 255, 0.35);
        }

        /* Mobile bottom nav */
        .mobile-bottom-nav {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-top: 1px solid var(--border-subtle);
            padding: 6px 4px env(safe-area-inset-bottom, 8px);
        }
        .mobile-bottom-nav .bottom-nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-around;
            max-width: 500px;
            margin: 0 auto;
        }
        .mobile-bottom-nav a {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 3px;
            font-size: 10px;
            font-weight: 500;
            color: var(--text-muted);
            padding: 4px 10px;
            border-radius: 10px;
            transition: all var(--transition-fast);
            white-space: nowrap;
        }
        .mobile-bottom-nav a .bn-icon {
            font-size: 18px;
            line-height: 1;
        }
        .mobile-bottom-nav a.active-bottom {
            color: var(--primary);
        }
        .mobile-bottom-nav .bn-cta {
            background: var(--primary);
            color: #fff !important;
            border-radius: 20px;
            padding: 8px 16px;
            font-weight: 700;
            font-size: 11px;
            flex-direction: row;
            gap: 4px;
            box-shadow: 0 4px 14px rgba(10, 102, 255, 0.35);
        }

        /* ========== HERO ========== */
        .hero-section {
            padding: 140px 0 100px;
            position: relative;
            overflow: hidden;
            background: var(--bg-white);
        }
        .hero-glow {
            position: absolute;
            bottom: 0;
            left: 0;
            width: 55%;
            height: 70%;
            background: radial-gradient(ellipse at bottom left, rgba(10, 102, 255, 0.07) 0%, transparent 70%);
            pointer-events: none;
            z-index: 0;
        }
        .hero-section .container {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 56px;
            align-items: center;
            position: relative;
            z-index: 1;
        }
        .hero-content {
            display: flex;
            flex-direction: column;
            gap: 24px;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--primary-light);
            color: var(--primary);
            font-weight: 600;
            font-size: 13px;
            padding: 8px 16px;
            border-radius: 20px;
            width: fit-content;
            letter-spacing: 0.5px;
        }
        .hero-badge .dot {
            width: 7px;
            height: 7px;
            background: var(--accent);
            border-radius: 50%;
            animation: pulse-dot 1.6s ease-in-out infinite;
        }
        @keyframes pulse-dot {
            0%,
            100% {
                box-shadow: 0 0 0 0 rgba(255, 79, 30, 0.6);
            }
            50% {
                box-shadow: 0 0 0 10px rgba(255, 79, 30, 0);
            }
        }
        .hero-title {
            font-size: var(--font-h1);
            font-weight: 800;
            line-height: 1.2;
            color: var(--text-dark);
            letter-spacing: -0.5px;
        }
        .hero-title .highlight {
            color: var(--primary);
            position: relative;
        }
        .hero-title .highlight::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 0;
            width: 100%;
            height: 8px;
            background: rgba(10, 102, 255, 0.13);
            border-radius: 4px;
            z-index: -1;
        }
        .hero-subtitle {
            font-size: 18px;
            color: var(--text-muted);
            line-height: 1.7;
            max-width: 480px;
        }
        .hero-buttons {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 15px;
            transition: all var(--transition-base);
            white-space: nowrap;
            position: relative;
            overflow: hidden;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 6px 22px rgba(10, 102, 255, 0.3);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            box-shadow: 0 10px 30px rgba(10, 102, 255, 0.4);
            transform: translateY(-2px);
        }
        .btn-primary .btn-arrow {
            transition: transform var(--transition-fast);
        }
        .btn-primary:hover .btn-arrow {
            transform: translateX(3px);
        }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary-light);
            border-color: var(--primary-dark);
            color: var(--primary-dark);
            transform: translateY(-2px);
        }
        .btn-pulse {
            animation: btn-glow 2.4s ease-in-out infinite;
        }
        @keyframes btn-glow {
            0%,
            100% {
                box-shadow: 0 6px 22px rgba(10, 102, 255, 0.3);
            }
            50% {
                box-shadow: 0 6px 36px rgba(10, 102, 255, 0.55), 0 0 0 12px rgba(10, 102, 255, 0.06);
            }
        }
        .hero-stats {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
            margin-top: 8px;
        }
        .stat-badge {
            background: var(--primary-light);
            border-radius: var(--radius-xs);
            padding: 12px 18px;
            text-align: center;
            min-width: 100px;
            flex: 1;
        }
        .stat-badge .stat-num {
            font-size: 24px;
            font-weight: 800;
            color: var(--primary);
            line-height: 1;
            display: block;
        }
        .stat-badge .stat-label {
            font-size: var(--font-sm);
            color: var(--text-muted);
            margin-top: 4px;
            letter-spacing: 0.5px;
            display: block;
        }
        .hero-visual {
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .hero-visual img {
            width: 100%;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-xl);
            object-fit: cover;
            aspect-ratio: 4/3;
        }
        .hero-visual::before {
            content: '';
            position: absolute;
            inset: -6px;
            border-radius: 28px;
            background: linear-gradient(135deg, rgba(10, 102, 255, 0.12), rgba(108, 99, 255, 0.06));
            z-index: -1;
            filter: blur(10px);
        }

        /* ========== SECTION COMMONS ========== */
        .section {
            padding: 100px 0;
        }
        .section-alt {
            background: var(--bg-off);
        }
        .section-header {
            text-align: center;
            margin-bottom: 56px;
        }
        .section-tag {
            display: inline-block;
            font-size: var(--font-sm);
            font-weight: 600;
            color: var(--primary);
            letter-spacing: 1px;
            text-transform: uppercase;
            margin-bottom: 12px;
            background: var(--primary-light);
            padding: 5px 14px;
            border-radius: 20px;
        }
        .section-title {
            font-size: var(--font-h2);
            font-weight: 700;
            color: var(--text-dark);
            line-height: 1.3;
            margin-bottom: 14px;
        }
        .section-desc {
            font-size: 16px;
            color: var(--text-muted);
            max-width: 600px;
            margin: 0 auto;
            line-height: 1.7;
        }

        /* ========== FEATURES ========== */
        .features-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            grid-template-rows: auto auto;
            gap: 20px;
        }
        .features-grid .feat-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 32px 28px;
            box-shadow: var(--shadow-md);
            transition: all var(--transition-base);
            position: relative;
            overflow: hidden;
            display: flex;
            flex-direction: column;
            gap: 14px;
            border: 1px solid transparent;
        }
        .features-grid .feat-card:nth-child(1),
        .features-grid .feat-card:nth-child(2) {
            grid-column: span 1;
            min-height: 220px;
        }
        .features-grid .feat-card:nth-child(3),
        .features-grid .feat-card:nth-child(4),
        .features-grid .feat-card:nth-child(5) {
            grid-column: span 1;
            min-height: 200px;
        }
        .features-grid {
            grid-template-columns: 1fr 1fr;
        }
        .features-grid .feat-card:nth-child(3) {
            grid-column: span 1;
        }
        .features-grid .feat-card:nth-child(4) {
            grid-column: span 1;
        }
        .features-grid .feat-card:nth-child(5) {
            grid-column: span 1;
        }
        /* Make row 2 have 3 cards */
        @media (min-width: 769px) {
            .features-grid {
                grid-template-columns: 1fr 1fr;
            }
            .features-grid .feat-card:nth-child(3) {
                grid-column: span 1;
            }
            .features-grid .feat-card:nth-child(4) {
                grid-column: span 1;
            }
            .features-grid .feat-card:nth-child(5) {
                grid-column: 1 / -1;
                max-width: 50%;
                justify-self: center;
            }
            /* Actually let me do: row1=2cards, row2=3cards */
            .features-grid {
                display: grid;
                grid-template-columns: 1fr 1fr 1fr;
                grid-template-rows: auto auto;
                gap: 20px;
            }
            .features-grid .feat-card:nth-child(1) {
                grid-column: span 2;
                grid-row: 1;
            }
            .features-grid .feat-card:nth-child(2) {
                grid-column: span 1;
                grid-row: 1;
            }
            .features-grid .feat-card:nth-child(3) {
                grid-column: span 1;
                grid-row: 2;
            }
            .features-grid .feat-card:nth-child(4) {
                grid-column: span 1;
                grid-row: 2;
            }
            .features-grid .feat-card:nth-child(5) {
                grid-column: span 1;
                grid-row: 2;
            }
        }

        .feat-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
            border-color: rgba(10, 102, 255, 0.1);
        }
        .feat-card .feat-icon {
            width: 48px;
            height: 48px;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            flex-shrink: 0;
        }
        .feat-card .feat-icon.blue {
            background: rgba(10, 102, 255, 0.1);
            color: var(--primary);
        }
        .feat-card .feat-icon.orange {
            background: var(--accent-light);
            color: var(--accent);
        }
        .feat-card .feat-card-title {
            font-size: var(--font-h3);
            font-weight: 700;
            color: var(--text-dark);
            line-height: 1.3;
        }
        .feat-card .feat-card-desc {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
        }
        .feat-card .feat-decor-line {
            position: absolute;
            bottom: 0;
            left: 28px;
            right: 28px;
            height: 4px;
            background: var(--primary);
            border-radius: 2px 2px 0 0;
            opacity: 0;
            transition: opacity var(--transition-base);
        }
        .feat-card:hover .feat-decor-line {
            opacity: 1;
        }
        .feat-card .feat-badge-mini {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            font-size: 12px;
            font-weight: 600;
            color: var(--accent);
            background: var(--accent-light);
            padding: 3px 10px;
            border-radius: 12px;
            width: fit-content;
        }

        /* ========== SCENARIOS ========== */
        .scenario-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 56px;
            align-items: center;
            margin-bottom: 64px;
        }
        .scenario-block:last-child {
            margin-bottom: 0;
        }
        .scenario-block.reverse {
            direction: rtl;
        }
        .scenario-block.reverse>* {
            direction: ltr;
        }
        .scenario-image img {
            width: 100%;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-md);
            aspect-ratio: 4/3;
            object-fit: cover;
        }
        .scenario-text {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .scenario-text h3 {
            font-size: var(--font-h2);
            font-weight: 700;
            color: var(--text-dark);
            line-height: 1.3;
        }
        .scenario-text p {
            font-size: 16px;
            color: var(--text-muted);
            line-height: 1.7;
        }
        .scenario-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--primary);
            font-weight: 600;
            font-size: 15px;
            transition: gap var(--transition-fast);
        }
        .scenario-link:hover {
            gap: 10px;
        }
        .scenario-link::after {
            content: '→';
            font-size: 18px;
            transition: transform var(--transition-fast);
        }
        .scenario-link:hover::after {
            transform: translateX(3px);
        }

        /* ========== SUCCESS ========== */
        .success-scroll {
            display: flex;
            gap: 20px;
            overflow-x: auto;
            scroll-snap-type: x mandatory;
            -webkit-overflow-scrolling: touch;
            padding-bottom: 16px;
            scrollbar-width: thin;
            scrollbar-color: var(--border-subtle) transparent;
        }
        .success-scroll::-webkit-scrollbar {
            height: 6px;
        }
        .success-scroll::-webkit-scrollbar-track {
            background: transparent;
        }
        .success-scroll::-webkit-scrollbar-thumb {
            background: var(--border-subtle);
            border-radius: 3px;
        }
        .success-card {
            flex: 0 0 320px;
            scroll-snap-align: start;
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 26px 22px;
            box-shadow: var(--shadow-md);
            transition: all var(--transition-base);
            display: flex;
            flex-direction: column;
            gap: 14px;
            position: relative;
            border: 1px solid transparent;
        }
        .success-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-3px);
            border-color: rgba(10, 102, 255, 0.08);
        }
        .success-card .sc-logo-row {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .sc-logo-circle {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 16px;
            color: var(--primary);
            flex-shrink: 0;
        }
        .sc-company {
            font-weight: 600;
            font-size: 14px;
            color: var(--text-dark);
        }
        .sc-quote {
            font-size: 14px;
            color: var(--text-body);
            line-height: 1.6;
            font-style: italic;
            position: relative;
            padding-left: 14px;
            border-left: 3px solid var(--primary-light);
        }
        .sc-stat {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            font-weight: 700;
            font-size: 18px;
            color: var(--accent);
            background: var(--accent-light);
            padding: 6px 14px;
            border-radius: 20px;
            width: fit-content;
        }
        .sc-arrow-hint {
            position: absolute;
            right: 18px;
            top: 50%;
            transform: translateY(-50%);
            opacity: 0;
            transition: all var(--transition-base);
            color: var(--primary);
            font-size: 18px;
        }
        .success-card:hover .sc-arrow-hint {
            opacity: 1;
            right: 12px;
        }

        /* ========== PRICING ========== */
        .pricing-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            align-items: stretch;
        }
        .pricing-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 36px 28px;
            box-shadow: var(--shadow-md);
            text-align: center;
            display: flex;
            flex-direction: column;
            gap: 16px;
            border: 2px solid transparent;
            transition: all var(--transition-base);
            position: relative;
        }
        .pricing-card.featured {
            border-color: var(--primary);
            box-shadow: var(--shadow-lg);
            transform: scale(1.03);
            z-index: 2;
        }
        .pricing-card.featured .pricing-badge {
            position: absolute;
            top: -14px;
            left: 50%;
            transform: translateX(-50%);
            background: var(--accent);
            color: #fff;
            font-weight: 700;
            font-size: 12px;
            padding: 5px 18px;
            border-radius: 20px;
            letter-spacing: 0.5px;
            white-space: nowrap;
        }
        .pricing-name {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-dark);
        }
        .pricing-price {
            font-size: 48px;
            font-weight: 800;
            color: var(--text-dark);
            line-height: 1;
        }
        .pricing-price .currency {
            font-size: 22px;
            font-weight: 600;
        }
        .pricing-price .period {
            font-size: 14px;
            font-weight: 400;
            color: var(--text-muted);
        }
        .pricing-features {
            list-style: none;
            text-align: left;
            display: flex;
            flex-direction: column;
            gap: 10px;
            flex-grow: 1;
        }
        .pricing-features li {
            font-size: 14px;
            color: var(--text-body);
            padding-left: 24px;
            position: relative;
            line-height: 1.5;
        }
        .pricing-features li::before {
            content: '✓';
            position: absolute;
            left: 0;
            top: 0;
            color: var(--primary);
            font-weight: 700;
            font-size: 14px;
        }
        .pricing-features li.muted-feat {
            color: var(--text-light);
        }
        .pricing-features li.muted-feat::before {
            color: var(--text-light);
        }
        .pricing-card .btn {
            width: 100%;
            justify-content: center;
            margin-top: auto;
        }
        .pricing-card.featured .btn {
            box-shadow: 0 6px 22px rgba(10, 102, 255, 0.35);
        }

        /* ========== FAQ ========== */
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            border-radius: var(--radius-md);
            overflow: hidden;
            background: var(--bg-white);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-subtle);
            transition: all var(--transition-fast);
        }
        .faq-item.open {
            box-shadow: var(--shadow-md);
            border-color: rgba(10, 102, 255, 0.15);
        }
        .faq-question {
            width: 100%;
            background: transparent;
            padding: 20px 50px 20px 24px;
            text-align: left;
            font-size: var(--font-h4);
            font-weight: 600;
            color: var(--text-dark);
            position: relative;
            cursor: pointer;
            border: none;
            line-height: 1.4;
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .faq-question .faq-bar {
            width: 3px;
            height: 24px;
            background: var(--primary);
            border-radius: 3px;
            flex-shrink: 0;
        }
        .faq-arrow {
            position: absolute;
            right: 20px;
            top: 50%;
            transform: translateY(-50%);
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: var(--accent-light);
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all var(--transition-base);
            color: var(--accent);
            font-size: 14px;
            font-weight: 700;
            flex-shrink: 0;
        }
        .faq-item.open .faq-arrow {
            transform: translateY(-50%) rotate(180deg);
            background: var(--accent);
            color: #fff;
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow), padding var(--transition-slow);
            background: var(--bg-off);
            padding: 0 24px;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 20px 24px;
        }
        .faq-answer p {
            font-size: 15px;
            color: var(--text-body);
            line-height: 1.7;
        }

        /* ========== CTA / CONTACT ========== */
        .cta-section {
            background: linear-gradient(135deg, #0A66FF 0%, #5B4FCF 60%, #6C63FF 100%);
            padding: 80px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
            opacity: 0.06;
            z-index: 0;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
        }
        .cta-title {
            font-size: var(--font-h2);
            font-weight: 800;
            color: #fff;
            line-height: 1.3;
            margin-bottom: 14px;
        }
        .cta-subtitle {
            font-size: 16px;
            color: rgba(255, 255, 255, 0.85);
            margin-bottom: 36px;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
        }
        .cta-form {
            display: flex;
            gap: 12px;
            max-width: 600px;
            margin: 0 auto;
            flex-wrap: wrap;
            justify-content: center;
        }
        .cta-form input {
            flex: 1;
            min-width: 160px;
            padding: 14px 18px;
            border-radius: 10px;
            background: #fff;
            color: var(--text-dark);
            font-size: 15px;
            border: 2px solid transparent;
            transition: all var(--transition-fast);
        }
        .cta-form input:focus {
            border-color: var(--accent);
            box-shadow: 0 0 0 6px rgba(255, 79, 30, 0.1);
        }
        .cta-form .btn {
            background: #fff;
            color: var(--primary);
            font-weight: 700;
            border-radius: 10px;
            padding: 14px 28px;
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
            flex-shrink: 0;
        }
        .cta-form .btn:hover {
            background: #f0f4ff;
            box-shadow: 0 10px 28px rgba(0, 0, 0, 0.2);
            transform: translateY(-2px);
        }

        /* ========== FOOTER ========== */
        .site-footer {
            background: #111127;
            color: #B0B0C8;
            padding: 56px 0 28px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
            gap: 36px;
            margin-bottom: 36px;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 15px;
            font-weight: 700;
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .footer-col p {
            font-size: 14px;
            line-height: 1.7;
            margin-bottom: 8px;
        }
        .footer-col ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .footer-col ul a {
            font-size: 14px;
            color: #B0B0C8;
            transition: color var(--transition-fast);
        }
        .footer-col ul a:hover {
            color: #fff;
        }
        .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 14px;
        }
        .footer-logo .logo-text {
            color: #fff;
            font-size: 20px;
            font-weight: 800;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 20px;
            text-align: center;
            font-size: 13px;
            color: #7B7B98;
        }

        /* ========== RESPONSIVE ========== */
        @media (max-width: 1024px) {
            :root {
                --font-h1: 36px;
                --font-h2: 28px;
                --font-h3: 20px;
            }
            .hero-section .container {
                gap: 36px;
            }
            .hero-stats {
                gap: 10px;
            }
            .stat-badge {
                padding: 10px 14px;
            }
            .stat-badge .stat-num {
                font-size: 20px;
            }
            .pricing-grid {
                grid-template-columns: 1fr;
                max-width: 420px;
                margin: 0 auto;
            }
            .pricing-card.featured {
                transform: scale(1);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
        }

        @media (max-width: 768px) {
            :root {
                --font-h1: 32px;
                --font-h2: 24px;
                --font-h3: 20px;
                --font-h4: 16px;
            }
            .section {
                padding: 60px 0;
            }
            .section-header {
                margin-bottom: 36px;
            }
            .site-header {
                height: 56px;
            }
            .nav-links {
                display: none;
            }
            .hamburger-btn {
                display: flex;
            }
            .mobile-bottom-nav {
                display: block;
            }
            body {
                padding-bottom: 70px;
            }
            .hero-section {
                padding: 100px 0 60px;
            }
            .hero-section .container {
                grid-template-columns: 1fr;
                gap: 32px;
                text-align: center;
            }
            .hero-content {
                align-items: center;
                text-align: center;
            }
            .hero-subtitle {
                max-width: 100%;
            }
            .hero-buttons {
                justify-content: center;
            }
            .hero-stats {
                justify-content: center;
            }
            .hero-visual {
                order: -1;
            }
            .hero-visual img {
                max-width: 85%;
                margin: 0 auto;
            }
            .features-grid {
                grid-template-columns: 1fr !important;
                grid-template-rows: auto !important;
            }
            .features-grid .feat-card:nth-child(1),
            .features-grid .feat-card:nth-child(2),
            .features-grid .feat-card:nth-child(3),
            .features-grid .feat-card:nth-child(4),
            .features-grid .feat-card:nth-child(5) {
                grid-column: 1 !important;
                grid-row: auto !important;
                max-width: 100% !important;
            }
            .scenario-block {
                grid-template-columns: 1fr;
                gap: 28px;
                margin-bottom: 40px;
            }
            .scenario-block.reverse {
                direction: ltr;
            }
            .scenario-image {
                order: -1;
            }
            .scenario-text h3 {
                font-size: 22px;
            }
            .success-card {
                flex: 0 0 270px;
            }
            .pricing-grid {
                grid-template-columns: 1fr;
                max-width: 380px;
                margin: 0 auto;
            }
            .cta-form {
                flex-direction: column;
                align-items: center;
            }
            .cta-form input {
                width: 100%;
                max-width: 400px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
                text-align: center;
            }
            .footer-logo {
                justify-content: center;
            }
            .cta-title {
                font-size: 22px;
            }
        }

        @media (max-width: 520px) {
            :root {
                --font-h1: 28px;
                --font-h2: 22px;
                --font-h3: 18px;
                --font-body: 15px;
            }
            .hero-stats {
                flex-direction: column;
                align-items: stretch;
                gap: 8px;
            }
            .stat-badge {
                text-align: center;
            }
            .hero-buttons {
                flex-direction: column;
                width: 100%;
            }
            .hero-buttons .btn {
                width: 100%;
                justify-content: center;
            }
            .btn {
                padding: 12px 24px;
                font-size: 14px;
            }
            .pricing-price {
                font-size: 38px;
            }
            .success-card {
                flex: 0 0 240px;
            }
            .faq-question {
                font-size: 15px;
                padding: 16px 44px 16px 16px;
            }
            .faq-answer p {
                font-size: 14px;
            }
        }