/* roulang page: index */
:root {
            --primary: #1E40AF;
            --primary-dark: #1E3A8A;
            --primary-light: #3B5CC9;
            --primary-bg: #EBF0FA;
            --accent: #F59E0B;
            --accent-light: #FEF3C7;
            --accent-dark: #D97706;
            --bg: #F8FAFC;
            --white: #FFFFFF;
            --text: #1E293B;
            --text-secondary: #64748B;
            --text-heading: #0F172A;
            --border: #E2E8F0;
            --border-light: #F1F5F9;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
            --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
            --shadow-xl: 0 16px 40px rgba(0, 0, 0, 0.14);
            --radius-sm: 6px;
            --radius: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-slow: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
            --section-gap: 88px;
            --section-gap-mobile: 48px;
            --container-max: 1200px;
            --container-padding: 24px;
            --nav-height: 68px;
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-stack);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background-color: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
            min-height: 100vh;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--primary);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input {
            font-family: inherit;
            font-size: inherit;
        }
        button {
            cursor: pointer;
            border: none;
            outline: none;
        }
        input {
            outline: none;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            color: var(--text-heading);
            line-height: 1.3;
            font-weight: 700;
        }

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

        /* ============ NAVIGATION ============ */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: var(--white);
            border-bottom: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            height: var(--nav-height);
            display: flex;
            align-items: center;
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }
        .nav-logo {
            font-size: 20px;
            font-weight: 700;
            color: var(--primary);
            white-space: nowrap;
            letter-spacing: -0.3px;
            transition: color var(--transition);
            flex-shrink: 0;
        }
        .nav-logo:hover {
            color: var(--primary-dark);
        }
        .nav-logo .logo-accent {
            color: var(--accent);
            font-weight: 800;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 32px;
        }
        .nav-links a {
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            position: relative;
            padding: 6px 0;
            transition: color var(--transition);
            white-space: nowrap;
        }
        .nav-links a:hover,
        .nav-links a.active {
            color: var(--primary);
        }
        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            right: 0;
            height: 2px;
            background: var(--primary);
            border-radius: 2px;
        }
        .nav-links a:not(.active)::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            right: 0;
            height: 2px;
            background: var(--primary);
            border-radius: 2px;
            transform: scaleX(0);
            transition: transform var(--transition);
        }
        .nav-links a:not(.active):hover::after {
            transform: scaleX(1);
        }
        .nav-actions {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }
        .btn-nav-login {
            padding: 9px 20px;
            border-radius: var(--radius);
            font-weight: 600;
            font-size: 14px;
            background: var(--primary);
            color: #fff;
            transition: all var(--transition);
            white-space: nowrap;
        }
        .btn-nav-login:hover {
            background: var(--primary-dark);
            transform: translateY(-1px);
            box-shadow: var(--shadow);
        }
        .btn-nav-register {
            padding: 9px 20px;
            border-radius: var(--radius);
            font-weight: 600;
            font-size: 14px;
            background: transparent;
            color: var(--accent-dark);
            border: 2px solid var(--accent);
            transition: all var(--transition);
            white-space: nowrap;
        }
        .btn-nav-register:hover {
            background: var(--accent-light);
            border-color: var(--accent-dark);
            transform: translateY(-1px);
            box-shadow: var(--shadow);
        }
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            padding: 8px;
            z-index: 1001;
            background: transparent;
            border: none;
        }
        .hamburger span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--text-heading);
            border-radius: 2px;
            transition: all var(--transition);
        }
        .hamburger.active span:nth-child(1) {
            transform: translateY(7.5px) rotate(45deg);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.active span:nth-child(3) {
            transform: translateY(-7.5px) rotate(-45deg);
        }
        .mobile-menu {
            display: none;
            position: fixed;
            top: var(--nav-height);
            left: 0;
            right: 0;
            bottom: 0;
            background: var(--white);
            z-index: 999;
            flex-direction: column;
            padding: 32px 24px;
            gap: 8px;
            overflow-y: auto;
        }
        .mobile-menu.active {
            display: flex;
        }
        .mobile-menu a {
            display: block;
            padding: 14px 20px;
            font-size: 17px;
            font-weight: 500;
            border-radius: var(--radius);
            color: var(--text);
            transition: all var(--transition);
        }
        .mobile-menu a:hover,
        .mobile-menu a.active {
            background: var(--primary-bg);
            color: var(--primary);
        }
        .mobile-menu .mobile-actions {
            display: flex;
            flex-direction: column;
            gap: 10px;
            margin-top: 16px;
            padding: 0 20px;
        }
        .mobile-menu .btn-nav-login,
        .mobile-menu .btn-nav-register {
            text-align: center;
            padding: 13px 20px;
            font-size: 15px;
            border-radius: var(--radius);
            width: 100%;
        }

        /* ============ HERO ============ */
        .hero {
            position: relative;
            min-height: 620px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
            background-position: center 30%;
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(15, 23, 42, 0.55) 0%, rgba(15, 23, 42, 0.72) 100%);
            z-index: 1;
        }
        .hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 780px;
            margin: 0 auto;
            padding: 60px 24px;
            width: 100%;
        }
        .hero-badge {
            display: inline-block;
            background: rgba(255, 255, 255, 0.15);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            color: #fff;
            padding: 7px 18px;
            border-radius: 50px;
            font-size: 13px;
            font-weight: 500;
            letter-spacing: 0.5px;
            margin-bottom: 20px;
            border: 1px solid rgba(255, 255, 255, 0.25);
        }
        .hero h1 {
            font-size: 44px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
            line-height: 1.25;
        }
        .hero h1 .highlight {
            color: var(--accent);
            position: relative;
        }
        .hero-subtitle {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.88);
            margin-bottom: 32px;
            line-height: 1.6;
            max-width: 560px;
            margin-left: auto;
            margin-right: auto;
        }
        .hero-search-wrap {
            display: flex;
            max-width: 520px;
            margin: 0 auto 28px;
            background: var(--white);
            border-radius: 50px;
            overflow: hidden;
            box-shadow: var(--shadow-xl);
            transition: box-shadow var(--transition);
        }
        .hero-search-wrap:focus-within {
            box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.3), var(--shadow-xl);
        }
        .hero-search-input {
            flex: 1;
            border: none;
            padding: 15px 22px;
            font-size: 15px;
            color: var(--text);
            background: transparent;
            min-width: 0;
        }
        .hero-search-input::placeholder {
            color: var(--text-secondary);
        }
        .hero-search-btn {
            background: var(--accent);
            color: #fff;
            padding: 15px 28px;
            font-weight: 700;
            font-size: 15px;
            border: none;
            cursor: pointer;
            transition: all var(--transition);
            white-space: nowrap;
            border-radius: 0 50px 50px 0;
        }
        .hero-search-btn:hover {
            background: var(--accent-dark);
        }
        .hero-tags {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 10px;
        }
        .hero-tag {
            padding: 8px 18px;
            border-radius: 50px;
            font-size: 13px;
            font-weight: 500;
            background: rgba(255, 255, 255, 0.12);
            color: #fff;
            border: 1px solid rgba(255, 255, 255, 0.3);
            cursor: pointer;
            transition: all var(--transition);
            white-space: nowrap;
            backdrop-filter: blur(4px);
            -webkit-backdrop-filter: blur(4px);
        }
        .hero-tag:hover {
            background: rgba(255, 255, 255, 0.25);
            border-color: rgba(255, 255, 255, 0.55);
            transform: translateY(-2px);
        }
        .hero-tag.tag-hot {
            background: var(--accent);
            border-color: var(--accent);
            color: #1a1a1a;
            font-weight: 600;
        }
        .hero-cta-row {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 14px;
            margin-top: 28px;
        }
        .btn-hero-primary {
            padding: 14px 32px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 16px;
            background: var(--accent);
            color: #1a1a1a;
            transition: all var(--transition);
            box-shadow: 0 4px 16px rgba(245, 158, 11, 0.4);
        }
        .btn-hero-primary:hover {
            background: #FBBF24;
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(245, 158, 11, 0.5);
        }
        .btn-hero-secondary {
            padding: 14px 32px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 16px;
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255, 255, 255, 0.6);
            transition: all var(--transition);
        }
        .btn-hero-secondary:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: #fff;
            transform: translateY(-2px);
        }

        /* ============ SECTIONS ============ */
        section {
            padding: var(--section-gap) 0;
        }
        .section-label {
            display: inline-block;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 1.5px;
            text-transform: uppercase;
            color: var(--primary);
            margin-bottom: 12px;
            background: var(--primary-bg);
            padding: 5px 14px;
            border-radius: 50px;
        }
        .section-title {
            font-size: 32px;
            font-weight: 700;
            color: var(--text-heading);
            margin-bottom: 14px;
            letter-spacing: -0.3px;
        }
        .section-desc {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 620px;
            line-height: 1.7;
        }
        .section-header {
            margin-bottom: 40px;
        }
        .section-header.centered {
            text-align: center;
        }
        .section-header.centered .section-desc {
            margin: 0 auto;
        }

        /* ============ PAIN POINTS ============ */
        .pain-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .pain-card {
            background: var(--white);
            border-radius: var(--radius-md);
            padding: 28px 28px 28px 32px;
            box-shadow: var(--shadow);
            display: flex;
            align-items: flex-start;
            gap: 18px;
            transition: all var(--transition);
            border-left: 4px solid transparent;
            position: relative;
        }
        .pain-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-2px);
            border-left-color: var(--accent);
        }
        .pain-icon {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary-bg);
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            font-size: 20px;
            color: var(--primary);
            transition: all var(--transition);
        }
        .pain-card:hover .pain-icon {
            background: var(--primary);
            color: #fff;
            transform: scale(1.08);
        }
        .pain-info h3 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 6px;
            color: var(--text-heading);
        }
        .pain-info p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* ============ SOLUTIONS ============ */
        .solution-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 28px;
        }
        .solution-card {
            background: var(--white);
            border-radius: var(--radius-lg);
            padding: 32px;
            box-shadow: var(--shadow);
            transition: all var(--transition);
            display: flex;
            gap: 20px;
            align-items: flex-start;
        }
        .solution-card.featured {
            grid-column: 1 / -1;
            background: linear-gradient(135deg, #1E40AF 0%, #1E3A8A 100%);
            color: #fff;
        }
        .solution-card.featured h3,
        .solution-card.featured p {
            color: #fff;
        }
        .solution-card.featured .solution-icon-circle {
            background: rgba(255, 255, 255, 0.2);
            color: #fff;
        }
        .solution-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-3px);
        }
        .solution-icon-circle {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: var(--primary-bg);
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            font-size: 22px;
            color: var(--primary);
            transition: all var(--transition);
        }
        .solution-card:hover .solution-icon-circle {
            transform: scale(1.1);
        }
        .solution-card.featured:hover .solution-icon-circle {
            background: rgba(255, 255, 255, 0.3);
        }
        .solution-info h3 {
            font-size: 19px;
            font-weight: 600;
            margin-bottom: 6px;
        }
        .solution-info p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }
        .solution-card.featured .solution-info p {
            color: rgba(255, 255, 255, 0.85);
        }

        /* ============ STATS ============ */
        .stats-section {
            background: #EEF2F9;
            position: relative;
            overflow: hidden;
        }
        .stats-section::before {
            content: '';
            position: absolute;
            top: -60px;
            left: -60px;
            width: 200px;
            height: 200px;
            border-radius: 50%;
            background: rgba(30, 64, 175, 0.04);
            pointer-events: none;
        }
        .stats-section::after {
            content: '';
            position: absolute;
            bottom: -40px;
            right: -40px;
            width: 160px;
            height: 160px;
            border-radius: 50%;
            background: rgba(245, 158, 11, 0.06);
            pointer-events: none;
        }
        .stats-row {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            text-align: center;
            position: relative;
            z-index: 1;
        }
        .stat-item {
            background: var(--white);
            border-radius: var(--radius-md);
            padding: 32px 20px;
            box-shadow: var(--shadow);
            transition: all var(--transition);
        }
        .stat-item:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }
        .stat-number {
            font-size: 42px;
            font-weight: 800;
            background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: 1.1;
            margin-bottom: 6px;
        }
        .stat-label {
            font-size: 14px;
            color: var(--text-secondary);
            font-weight: 500;
        }

        /* ============ CATEGORIES ============ */
        .cat-scroll {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
            justify-content: center;
        }
        .cat-card {
            background: var(--white);
            border-radius: var(--radius-md);
            padding: 18px 24px;
            box-shadow: var(--shadow);
            text-align: center;
            cursor: pointer;
            transition: all var(--transition);
            min-width: 110px;
            flex: 0 0 auto;
            border: 2px solid transparent;
        }
        .cat-card:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-lg);
            transform: translateY(-3px);
        }
        .cat-card .cat-icon {
            font-size: 28px;
            margin-bottom: 8px;
            color: var(--primary);
        }
        .cat-card .cat-name {
            font-weight: 600;
            font-size: 15px;
            color: var(--text-heading);
        }
        .cat-card .cat-count {
            font-size: 12px;
            color: var(--text-secondary);
            margin-top: 3px;
        }

        /* ============ TESTIMONIALS ============ */
        .testimonial-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .testimonial-card {
            background: var(--white);
            border-radius: var(--radius-md);
            padding: 28px;
            box-shadow: var(--shadow);
            border-left: 4px solid var(--accent);
            transition: all var(--transition);
            position: relative;
        }
        .testimonial-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-2px);
        }
        .testimonial-card .quote-mark {
            font-size: 48px;
            color: var(--accent-light);
            position: absolute;
            top: 12px;
            right: 20px;
            font-family: Georgia, serif;
            line-height: 1;
            pointer-events: none;
        }
        .testimonial-header {
            display: flex;
            align-items: center;
            gap: 14px;
            margin-bottom: 14px;
        }
        .testimonial-avatar {
            width: 48px;
            height: 48px;
            border-radius: var(--radius);
            object-fit: cover;
            flex-shrink: 0;
            background: var(--border-light);
        }
        .testimonial-meta .tm-name {
            font-weight: 600;
            font-size: 15px;
            color: var(--text-heading);
        }
        .testimonial-meta .tm-info {
            font-size: 12px;
            color: var(--text-secondary);
        }
        .testimonial-text {
            font-size: 14px;
            color: var(--text);
            line-height: 1.7;
            font-style: italic;
        }

        /* ============ GUARANTEE BAR ============ */
        .guarantee-bar {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 20px;
            text-align: center;
        }
        .guarantee-item {
            padding: 24px 16px;
            transition: all var(--transition);
        }
        .guarantee-item:hover {
            transform: translateY(-3px);
        }
        .guarantee-icon-wrap {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: var(--primary-bg);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 12px;
            font-size: 22px;
            color: var(--primary);
            transition: all var(--transition);
        }
        .guarantee-item:hover .guarantee-icon-wrap {
            background: var(--primary);
            color: #fff;
        }
        .guarantee-item h4 {
            font-size: 15px;
            font-weight: 600;
            margin-bottom: 4px;
        }
        .guarantee-item p {
            font-size: 12px;
            color: var(--text-secondary);
        }

        /* ============ CHANGELOG ============ */
        .changelog-list {
            max-width: 720px;
            margin: 0 auto;
        }
        .changelog-item {
            display: flex;
            gap: 20px;
            padding: 20px 0;
            border-bottom: 1px solid var(--border-light);
            transition: all var(--transition);
        }
        .changelog-item:last-child {
            border-bottom: none;
        }
        .changelog-version {
            flex-shrink: 0;
            width: 70px;
            font-weight: 700;
            font-size: 14px;
            color: var(--primary);
            background: var(--primary-bg);
            padding: 6px 12px;
            border-radius: 50px;
            text-align: center;
            height: fit-content;
        }
        .changelog-content h4 {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 4px;
        }
        .changelog-content p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }
        .changelog-date {
            font-size: 12px;
            color: var(--text-secondary);
            margin-top: 4px;
        }

        /* ============ NEWS ============ */
        .news-layout {
            display: grid;
            grid-template-columns: 1fr 340px;
            gap: 32px;
            align-items: start;
        }
        .news-list {
            display: flex;
            flex-direction: column;
            gap: 0;
        }
        .news-list-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 16px 0;
            border-bottom: 1px solid var(--border-light);
            transition: all var(--transition);
            gap: 16px;
        }
        .news-list-item:hover {
            color: var(--primary);
            padding-left: 6px;
        }
        .news-list-title {
            font-weight: 500;
            font-size: 15px;
            flex: 1;
            min-width: 0;
        }
        .news-list-date {
            font-size: 12px;
            color: var(--text-secondary);
            flex-shrink: 0;
        }
        .news-recommend {
            background: var(--white);
            border-radius: var(--radius-md);
            padding: 24px;
            box-shadow: var(--shadow);
            position: sticky;
            top: calc(var(--nav-height) + 24px);
        }
        .news-recommend h3 {
            font-size: 18px;
            margin-bottom: 16px;
            padding-bottom: 12px;
            border-bottom: 2px solid var(--primary-bg);
        }
        .news-rec-card {
            display: flex;
            gap: 12px;
            padding: 12px 0;
            border-bottom: 1px solid var(--border-light);
            transition: all var(--transition);
            cursor: pointer;
        }
        .news-rec-card:last-child {
            border-bottom: none;
        }
        .news-rec-card:hover {
            color: var(--primary);
        }
        .news-rec-thumb {
            width: 70px;
            height: 56px;
            border-radius: var(--radius-sm);
            object-fit: cover;
            flex-shrink: 0;
            background: var(--border-light);
        }
        .news-rec-info {
            flex: 1;
            min-width: 0;
        }
        .news-rec-info .rec-title {
            font-size: 14px;
            font-weight: 500;
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .news-rec-info .rec-date {
            font-size: 11px;
            color: var(--text-secondary);
            margin-top: 4px;
        }

        /* ============ FAQ ============ */
        .faq-list {
            max-width: 750px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--white);
            border-radius: var(--radius-md);
            margin-bottom: 12px;
            box-shadow: var(--shadow-sm);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover {
            box-shadow: var(--shadow);
        }
        .faq-question {
            width: 100%;
            text-align: left;
            padding: 18px 24px;
            background: #F1F5F9;
            border: none;
            font-weight: 600;
            font-size: 16px;
            color: var(--text-heading);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: all var(--transition);
            gap: 16px;
        }
        .faq-question:hover {
            background: #E8EEF6;
        }
        .faq-arrow {
            flex-shrink: 0;
            transition: transform var(--transition-slow);
            font-size: 14px;
            color: var(--text-secondary);
        }
        .faq-item.open .faq-arrow {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-item.open .faq-question {
            background: #E0E8F3;
            color: var(--primary);
        }
        .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 24px 20px;
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* ============ CTA ============ */
        .cta-section {
            background: linear-gradient(135deg, #1E3A8A 0%, #1E40AF 40%, #1E3A8A 100%);
            color: #fff;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -80px;
            right: -80px;
            width: 260px;
            height: 260px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.03);
            pointer-events: none;
        }
        .cta-section::after {
            content: '';
            position: absolute;
            bottom: -60px;
            left: -60px;
            width: 200px;
            height: 200px;
            border-radius: 50%;
            background: rgba(245, 158, 11, 0.08);
            pointer-events: none;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
        }
        .cta-section .section-title {
            color: #fff;
            font-size: 34px;
        }
        .cta-section .section-desc {
            color: rgba(255, 255, 255, 0.8);
            margin: 0 auto 32px;
            font-size: 17px;
        }
        .cta-buttons {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 16px;
        }
        .btn-cta-primary {
            padding: 15px 36px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 17px;
            background: var(--accent);
            color: #1a1a1a;
            transition: all var(--transition);
            box-shadow: 0 6px 24px rgba(245, 158, 11, 0.45);
            border: none;
            cursor: pointer;
        }
        .btn-cta-primary:hover {
            background: #FBBF24;
            transform: translateY(-3px);
            box-shadow: 0 10px 32px rgba(245, 158, 11, 0.55);
        }
        .btn-cta-secondary {
            padding: 15px 36px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 17px;
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255, 255, 255, 0.5);
            transition: all var(--transition);
            cursor: pointer;
        }
        .btn-cta-secondary:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: #fff;
            transform: translateY(-3px);
        }

        /* ============ FOOTER ============ */
        .site-footer {
            background: #1E293B;
            color: #CBD5E1;
            padding: 48px 0 28px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 36px;
            margin-bottom: 32px;
        }
        .footer-brand .footer-logo {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 10px;
        }
        .footer-brand .footer-logo .logo-accent {
            color: var(--accent);
        }
        .footer-brand p {
            font-size: 13px;
            color: #94A3B8;
            line-height: 1.6;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 15px;
            font-weight: 600;
            margin-bottom: 14px;
        }
        .footer-col a {
            display: block;
            font-size: 13px;
            color: #94A3B8;
            padding: 5px 0;
            transition: color var(--transition);
        }
        .footer-col a:hover {
            color: var(--accent);
        }
        .footer-bottom {
            border-top: 1px solid #334155;
            padding-top: 20px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            font-size: 13px;
            color: #94A3B8;
        }
        .footer-social {
            display: flex;
            gap: 14px;
        }
        .footer-social a {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: #334155;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #CBD5E1;
            transition: all var(--transition);
            font-size: 15px;
        }
        .footer-social a:hover {
            background: var(--accent);
            color: #1a1a1a;
            transform: translateY(-2px);
        }

        /* ============ RESPONSIVE ============ */
        @media (max-width: 1024px) {
            .section-title {
                font-size: 28px;
            }
            .hero h1 {
                font-size: 36px;
            }
            .stats-row {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
        }
        @media (max-width: 768px) {
            :root {
                --section-gap: 48px;
                --nav-height: 60px;
            }
            .nav-links {
                display: none;
            }
            .nav-actions {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .hero {
                min-height: 500px;
            }
            .hero h1 {
                font-size: 28px;
            }
            .hero-subtitle {
                font-size: 15px;
            }
            .hero-search-wrap {
                max-width: 100%;
                border-radius: 40px;
            }
            .hero-search-btn {
                padding: 14px 20px;
                font-size: 14px;
                border-radius: 0 40px 40px 0;
            }
            .hero-search-input {
                padding: 13px 16px;
                font-size: 14px;
            }
            .hero-tags {
                gap: 7px;
            }
            .hero-tag {
                padding: 6px 14px;
                font-size: 12px;
            }
            .section-title {
                font-size: 24px;
            }
            .pain-grid {
                grid-template-columns: 1fr;
            }
            .solution-grid {
                grid-template-columns: 1fr;
            }
            .solution-card.featured {
                grid-column: 1;
            }
            .stats-row {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .stat-number {
                font-size: 32px;
            }
            .testimonial-grid {
                grid-template-columns: 1fr;
            }
            .guarantee-bar {
                grid-template-columns: repeat(3, 1fr);
                gap: 12px;
            }
            .news-layout {
                grid-template-columns: 1fr;
            }
            .news-recommend {
                position: static;
            }
            .cat-scroll {
                gap: 10px;
            }
            .cat-card {
                padding: 14px 16px;
                min-width: 90px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .cta-section .section-title {
                font-size: 26px;
            }
            .btn-hero-primary,
            .btn-hero-secondary {
                width: 100%;
                text-align: center;
            }
            .hero-cta-row {
                flex-direction: column;
                align-items: stretch;
            }
            .changelog-item {
                flex-direction: column;
                gap: 10px;
            }
            .changelog-version {
                width: fit-content;
            }
        }
        @media (max-width: 520px) {
            .hero h1 {
                font-size: 24px;
            }
            .hero-subtitle {
                font-size: 14px;
            }
            .section-title {
                font-size: 22px;
            }
            .section-desc {
                font-size: 14px;
            }
            .stats-row {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-number {
                font-size: 28px;
            }
            .guarantee-bar {
                grid-template-columns: repeat(2, 1fr);
            }
            .btn-cta-primary,
            .btn-cta-secondary {
                width: 100%;
                text-align: center;
            }
            .cta-buttons {
                flex-direction: column;
                align-items: stretch;
            }
            .pain-card {
                padding: 20px;
            }
            .solution-card {
                padding: 22px;
            }
            .testimonial-card {
                padding: 20px;
            }
        }