/* roulang page: index */
:root {
            --primary: #2563EB;
            --primary-dark: #1D4ED8;
            --primary-light: #3B82F6;
            --accent: #F97316;
            --accent-dark: #EA580C;
            --success: #10B981;
            --success-light: #D1FAE5;
            --bg: #F8FAFC;
            --bg-blue: #EFF6FF;
            --card-bg: #FFFFFF;
            --text-heading: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --text-light: #94A3B8;
            --border: #CBD5E1;
            --border-light: #E2E8F0;
            --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
            --card-shadow-hover: 0 12px 24px rgba(0, 0, 0, 0.08);
            --radius-sm: 6px;
            --radius: 8px;
            --radius-lg: 12px;
            --radius-xl: 16px;
            --radius-full: 9999px;
            --spacing-xs: 8px;
            --spacing-sm: 16px;
            --spacing-md: 24px;
            --spacing-lg: 40px;
            --spacing-xl: 64px;
            --spacing-2xl: 80px;
            --spacing-3xl: 120px;
            --nav-height: 64px;
            --max-width: 1200px;
            --font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
            --transition-fast: 0.2s ease;
            --transition: 0.25s ease;
            --transition-slow: 0.35s ease;
            --focus-ring: 0 0 0 3px rgba(37, 99, 235, 0.25);
        }

        *,
        *::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-family);
            font-size: 16px;
            line-height: 1.6;
            color: var(--text-body);
            background-color: var(--bg);
            min-height: 100vh;
            overflow-x: hidden;
        }

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

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

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

        button:focus-visible,
        a:focus-visible,
        input:focus-visible,
        select:focus-visible,
        textarea:focus-visible {
            outline: none;
            box-shadow: var(--focus-ring);
            border-radius: var(--radius-sm);
        }

        input,
        select,
        textarea {
            font-family: inherit;
            font-size: 16px;
        }

        ul,
        ol {
            list-style: none;
        }

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

        /* ===== 导航 ===== */
        .nav {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--nav-height);
            background: rgba(255, 255, 255, 0.88);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-light);
            transition: all var(--transition);
        }

        .nav.scrolled {
            background: rgba(255, 255, 255, 0.96);
            box-shadow: 0 2px 16px rgba(0, 0, 0, 0.06);
        }

        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 var(--spacing-md);
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 22px;
            color: var(--text-heading);
            letter-spacing: -0.3px;
            flex-shrink: 0;
        }

        .nav-logo-icon {
            width: 38px;
            height: 38px;
            background: var(--primary);
            border-radius: var(--radius);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: 900;
            font-size: 18px;
            letter-spacing: -1px;
            flex-shrink: 0;
            position: relative;
        }

        .nav-logo-icon::after {
            content: '';
            position: absolute;
            width: 8px;
            height: 8px;
            background: var(--accent);
            border-radius: 50%;
            top: -3px;
            right: -3px;
            border: 2px solid #fff;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .nav-links a {
            display: inline-flex;
            align-items: center;
            padding: 8px 16px;
            border-radius: var(--radius);
            font-weight: 500;
            font-size: 15px;
            color: var(--text-body);
            transition: all var(--transition-fast);
            position: relative;
            white-space: nowrap;
        }

        .nav-links a:hover,
        .nav-links a.active {
            color: var(--primary);
            background: var(--bg-blue);
        }

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

        .nav-cta-btn {
            display: inline-flex;
            align-items: center;
            padding: 10px 20px;
            background: var(--primary);
            color: #fff !important;
            border-radius: var(--radius);
            font-weight: 600;
            font-size: 14px;
            transition: all var(--transition-fast);
            white-space: nowrap;
            margin-left: 8px;
        }

        .nav-cta-btn:hover {
            background: var(--primary-dark);
            color: #fff !important;
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
        }

        .nav-hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            padding: 8px;
            background: none;
            border: none;
            z-index: 1001;
        }

        .nav-hamburger span {
            display: block;
            width: 24px;
            height: 2.5px;
            background: var(--text-heading);
            border-radius: 2px;
            transition: all var(--transition);
        }

        .nav-hamburger.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .nav-hamburger.active span:nth-child(2) {
            opacity: 0;
            transform: scaleX(0);
        }
        .nav-hamburger.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        .nav-mobile-overlay {
            display: none;
            position: fixed;
            inset: 0;
            z-index: 999;
            background: rgba(255, 255, 255, 0.98);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 20px;
        }

        .nav-mobile-overlay.active {
            display: flex;
        }

        .nav-mobile-overlay a {
            font-size: 20px;
            font-weight: 600;
            color: var(--text-heading);
            padding: 12px 24px;
            border-radius: var(--radius);
            transition: all var(--transition-fast);
        }

        .nav-mobile-overlay a:hover {
            color: var(--primary);
            background: var(--bg-blue);
        }

        .nav-mobile-close {
            position: absolute;
            top: 18px;
            right: 20px;
            font-size: 32px;
            background: none;
            border: none;
            color: var(--text-heading);
            cursor: pointer;
            width: 48px;
            height: 48px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            transition: background var(--transition-fast);
        }

        .nav-mobile-close:hover {
            background: var(--bg-blue);
        }

        /* ===== Hero ===== */
        .hero {
            min-height: 100vh;
            display: flex;
            align-items: center;
            padding-top: var(--nav-height);
            position: relative;
            background: linear-gradient(160deg, #F8FAFC 0%, #EFF6FF 40%, #F0F4FF 100%);
            overflow: hidden;
        }

        .hero-bg-pattern {
            position: absolute;
            inset: 0;
            pointer-events: none;
            z-index: 0;
            opacity: 0.5;
        }

        .hero-bg-pattern::before {
            content: '';
            position: absolute;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(37, 99, 235, 0.06) 0%, transparent 70%);
            top: -150px;
            right: -100px;
            border-radius: 50%;
        }

        .hero-bg-pattern::after {
            content: '';
            position: absolute;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(249, 115, 22, 0.04) 0%, transparent 70%);
            bottom: -80px;
            left: -60px;
            border-radius: 50%;
        }

        .hero .container {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
            position: relative;
            z-index: 1;
        }

        .hero-content {
            max-width: 560px;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: #fff;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-full);
            padding: 6px 16px;
            font-size: 13px;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: var(--spacing-md);
            animation: fadeInUp 0.6s ease forwards;
        }

        .hero-badge-dot {
            width: 8px;
            height: 8px;
            background: var(--success);
            border-radius: 50%;
            animation: pulse-dot 2s infinite;
        }

        @keyframes pulse-dot {
            0%,
            100% {
                box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.5);
            }
            50% {
                box-shadow: 0 0 0 10px rgba(16, 185, 129, 0);
            }
        }

        .hero h1 {
            font-size: 42px;
            font-weight: 700;
            color: var(--text-heading);
            line-height: 1.2;
            margin-bottom: var(--spacing-sm);
            letter-spacing: -0.5px;
            animation: fadeInUp 0.6s ease 0.1s forwards;
            opacity: 0;
        }

        .hero h1 .highlight {
            color: var(--primary);
            position: relative;
        }

        .hero h1 .highlight::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 0;
            right: 0;
            height: 8px;
            background: rgba(37, 99, 235, 0.15);
            border-radius: 4px;
            z-index: -1;
        }

        .hero-subtitle {
            font-size: 18px;
            color: #475569;
            line-height: 1.7;
            margin-bottom: var(--spacing-lg);
            animation: fadeInUp 0.6s ease 0.2s forwards;
            opacity: 0;
        }

        .hero-actions {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
            animation: fadeInUp 0.6s ease 0.3s forwards;
            opacity: 0;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 14px 28px;
            border-radius: var(--radius);
            font-weight: 600;
            font-size: 15px;
            transition: all var(--transition);
            white-space: nowrap;
            cursor: pointer;
            border: none;
        }

        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(37, 99, 235, 0.35);
        }

        .btn-secondary {
            background: transparent;
            color: var(--primary);
            border: 1.5px solid var(--primary);
        }

        .btn-secondary:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }

        .btn-lg {
            padding: 16px 32px;
            font-size: 16px;
            border-radius: var(--radius-lg);
        }

        .hero-visual {
            display: flex;
            align-items: center;
            justify-content: center;
            animation: fadeInRight 0.7s ease 0.2s forwards;
            opacity: 0;
        }

        .hero-visual img {
            width: 100%;
            max-width: 520px;
            height: auto;
            border-radius: var(--radius-xl);
            box-shadow: 0 20px 50px rgba(0, 0, 0, 0.1);
            transition: transform var(--transition-slow);
        }

        .hero-visual img:hover {
            transform: translateY(-6px);
            box-shadow: 0 28px 60px rgba(0, 0, 0, 0.14);
        }

        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(24px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        @keyframes fadeInRight {
            from {
                opacity: 0;
                transform: translateX(30px);
            }
            to {
                opacity: 1;
                transform: translateX(0);
            }
        }

        /* ===== 指标看板 ===== */
        .numbers-section {
            padding: var(--spacing-3xl) 0;
            background: linear-gradient(180deg, #fff 0%, var(--bg-blue) 100%);
            position: relative;
        }

        .numbers-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 4px;
            background: var(--primary);
            border-radius: 2px;
            opacity: 0.5;
        }

        .numbers-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--spacing-md);
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 var(--spacing-md);
        }

        .number-card {
            background: #fff;
            border-radius: var(--radius-lg);
            padding: 32px 24px;
            text-align: center;
            box-shadow: var(--card-shadow);
            transition: all var(--transition);
            border: 1px solid transparent;
        }

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

        .number-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            font-size: 24px;
            background: var(--bg-blue);
            color: var(--primary);
            transition: all var(--transition);
        }

        .number-card:hover .number-icon {
            background: var(--primary);
            color: #fff;
            transform: scale(1.08);
        }

        .number-value {
            font-size: 36px;
            font-weight: 700;
            color: var(--text-heading);
            margin-bottom: 6px;
            letter-spacing: -1px;
        }

        .number-value .suffix {
            font-size: 20px;
            color: var(--primary);
            margin-left: 2px;
        }

        .number-label {
            font-size: 14px;
            color: var(--text-muted);
            font-weight: 500;
        }

        /* ===== 服务矩阵 ===== */
        .services-section {
            padding: var(--spacing-3xl) 0;
            background: #fff;
        }

        .section-header {
            text-align: center;
            margin-bottom: var(--spacing-xl);
        }

        .section-tag {
            display: inline-block;
            padding: 6px 16px;
            background: var(--bg-blue);
            color: var(--primary);
            border-radius: var(--radius-full);
            font-weight: 600;
            font-size: 13px;
            letter-spacing: 0.5px;
            margin-bottom: var(--spacing-sm);
        }

        .section-title {
            font-size: 32px;
            font-weight: 700;
            color: var(--text-heading);
            margin-bottom: var(--spacing-xs);
            letter-spacing: -0.3px;
        }

        .section-desc {
            font-size: 16px;
            color: var(--text-muted);
            max-width: 560px;
            margin: 0 auto;
            line-height: 1.7;
        }

        .services-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--spacing-md);
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 var(--spacing-md);
        }

        .service-item {
            background: #fff;
            border-radius: var(--radius-lg);
            padding: 28px 20px 22px;
            text-align: center;
            box-shadow: var(--card-shadow);
            transition: all var(--transition);
            border: 1px solid transparent;
            cursor: default;
        }

        .service-item:hover {
            box-shadow: var(--card-shadow-hover);
            transform: translateY(-4px);
            border-color: var(--border-light);
        }

        .service-icon-wrap {
            width: 64px;
            height: 64px;
            border-radius: 50%;
            background: var(--bg-blue);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            transition: all var(--transition);
            overflow: hidden;
        }

        .service-item:hover .service-icon-wrap {
            transform: scale(1.1);
            background: #DBEAFE;
        }

        .service-icon-wrap img {
            width: 36px;
            height: 36px;
            object-fit: contain;
        }

        .service-name {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-heading);
            margin-bottom: 8px;
        }

        .service-desc {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
            margin-bottom: 14px;
        }

        .service-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
            justify-content: center;
        }

        .service-tag {
            display: inline-block;
            padding: 4px 10px;
            background: var(--bg-blue);
            color: var(--primary);
            border-radius: var(--radius-full);
            font-size: 11px;
            font-weight: 600;
            letter-spacing: 0.3px;
        }

        /* ===== 结果对比 ===== */
        .comparison-section {
            padding: var(--spacing-3xl) 0;
            background: var(--bg);
            position: relative;
        }

        .comparison-section .section-header {
            position: relative;
            z-index: 1;
        }

        .comparison-wrapper {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--spacing-lg);
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 var(--spacing-md);
            position: relative;
            z-index: 1;
        }

        .comparison-card {
            background: #fff;
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            box-shadow: var(--card-shadow);
            position: relative;
            transition: all var(--transition);
        }

        .comparison-card.recommended {
            border: 2px solid var(--primary);
            box-shadow: 0 8px 28px rgba(37, 99, 235, 0.1);
        }

        .comparison-card.recommended::before {
            content: '推荐';
            position: absolute;
            top: -14px;
            right: 24px;
            background: var(--primary);
            color: #fff;
            padding: 4px 14px;
            border-radius: var(--radius-full);
            font-size: 12px;
            font-weight: 700;
            letter-spacing: 1px;
        }

        .comparison-card h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-heading);
            margin-bottom: 20px;
            text-align: center;
        }

        .comparison-card.recommended h3 {
            color: var(--primary);
        }

        .comparison-rows {
            display: flex;
            flex-direction: column;
            gap: 2px;
        }

        .comparison-row {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 14px;
            border-radius: var(--radius-sm);
            font-size: 14px;
            transition: background var(--transition-fast);
        }

        .comparison-row:hover {
            background: #F8FAFC;
        }

        .comparison-row.highlight-row {
            background: var(--success-light);
            font-weight: 600;
        }

        .comparison-icon {
            width: 22px;
            height: 22px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            font-size: 12px;
            font-weight: 700;
        }

        .comparison-icon.check {
            background: #D1FAE5;
            color: var(--success);
        }

        .comparison-icon.cross {
            background: #FEE2E2;
            color: #EF4444;
        }

        .comparison-icon.neutral {
            background: #F1F5F9;
            color: #94A3B8;
        }

        /* ===== FAQ ===== */
        .faq-section {
            padding: var(--spacing-3xl) 0;
            background: #fff;
        }

        .faq-list {
            max-width: 760px;
            margin: 0 auto;
            padding: 0 var(--spacing-md);
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .faq-item {
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition);
            background: #fff;
        }

        .faq-item:hover {
            border-color: #CBD5E1;
        }

        .faq-item.active {
            border-color: var(--primary);
            box-shadow: 0 4px 16px rgba(37, 99, 235, 0.06);
        }

        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 22px;
            background: none;
            border: none;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-heading);
            cursor: pointer;
            text-align: left;
            gap: 16px;
            min-height: 56px;
            position: relative;
        }

        .faq-question .faq-indicator {
            width: 3px;
            height: 20px;
            background: transparent;
            border-radius: 2px;
            flex-shrink: 0;
            transition: all var(--transition);
        }

        .faq-item.active .faq-indicator {
            background: var(--primary);
            height: 28px;
        }

        .faq-question-text {
            flex: 1;
        }

        .faq-arrow {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            flex-shrink: 0;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all var(--transition);
            color: var(--text-muted);
            font-size: 14px;
            background: #F8FAFC;
        }

        .faq-item.active .faq-arrow {
            transform: rotate(180deg);
            background: var(--bg-blue);
            color: var(--primary);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow), padding var(--transition-slow);
        }

        .faq-item.active .faq-answer {
            max-height: 300px;
        }

        .faq-answer-inner {
            padding: 0 22px 18px 42px;
            color: var(--text-body);
            font-size: 15px;
            line-height: 1.7;
            background: #F8FAFC;
            border-radius: 0 0 var(--radius-lg) var(--radius-lg);
        }

        /* ===== 转化表单 ===== */
        .contact-section {
            padding: var(--spacing-3xl) 0;
            background: linear-gradient(180deg, var(--bg-blue) 0%, #F0F4FF 100%);
            position: relative;
        }

        .contact-card {
            max-width: 560px;
            margin: 0 auto;
            background: #fff;
            border-radius: var(--radius-xl);
            padding: 40px 36px;
            box-shadow: 0 16px 40px rgba(0, 0, 0, 0.06);
            position: relative;
            z-index: 1;
        }

        .contact-card .section-title {
            text-align: center;
            font-size: 26px;
        }

        .contact-card .section-desc {
            text-align: center;
            margin-bottom: 28px;
        }

        .form-group {
            margin-bottom: 18px;
        }

        .form-group label {
            display: block;
            font-weight: 600;
            font-size: 14px;
            color: var(--text-heading);
            margin-bottom: 6px;
        }

        .form-group input,
        .form-group select {
            width: 100%;
            padding: 13px 16px;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            font-size: 15px;
            color: var(--text-heading);
            background: #fff;
            transition: all var(--transition-fast);
        }

        .form-group input:focus,
        .form-group select:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
            outline: none;
        }

        .form-group input::placeholder {
            color: #A0AEC0;
        }

        .form-submit {
            width: 100%;
            padding: 15px;
            background: var(--primary);
            color: #fff;
            border: none;
            border-radius: var(--radius);
            font-size: 16px;
            font-weight: 700;
            cursor: pointer;
            transition: all var(--transition);
            letter-spacing: 0.5px;
        }

        .form-submit:hover {
            background: var(--primary-dark);
            box-shadow: 0 8px 24px rgba(37, 99, 235, 0.3);
            transform: translateY(-1px);
        }

        .form-privacy {
            text-align: center;
            font-size: 12px;
            color: var(--text-muted);
            margin-top: 12px;
        }

        .form-privacy a {
            color: var(--primary);
            text-decoration: underline;
        }

        .form-success-msg {
            display: none;
            text-align: center;
            padding: 20px;
            color: var(--success);
            font-weight: 600;
            font-size: 16px;
        }

        /* ===== 页脚 ===== */
        .footer {
            background: #0F172A;
            color: #CBD5E1;
            padding: 48px 0 32px;
        }

        .footer-inner {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 var(--spacing-md);
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
            gap: 16px;
        }

        .footer-logo {
            font-size: 22px;
            font-weight: 700;
            color: #fff;
            letter-spacing: -0.3px;
            margin-bottom: 4px;
        }

        .footer-links {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
            justify-content: center;
        }

        .footer-links a {
            color: #CBD5E1;
            font-size: 14px;
            transition: color var(--transition-fast);
        }

        .footer-links a:hover {
            color: var(--primary-light);
        }

        .footer-info {
            font-size: 13px;
            color: #94A3B8;
            line-height: 1.8;
        }

        .footer-back-top {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 10px 20px;
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.12);
            color: #CBD5E1;
            border-radius: var(--radius-full);
            cursor: pointer;
            font-size: 14px;
            transition: all var(--transition-fast);
            margin-top: 8px;
        }

        .footer-back-top:hover {
            background: rgba(255, 255, 255, 0.12);
            color: #fff;
            border-color: rgba(255, 255, 255, 0.25);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .hero .container {
                grid-template-columns: 1fr;
                gap: 40px;
                text-align: center;
            }
            .hero-content {
                max-width: 100%;
                margin: 0 auto;
            }
            .hero-actions {
                justify-content: center;
            }
            .hero-visual img {
                max-width: 380px;
                margin: 0 auto;
            }
            .hero h1 {
                font-size: 34px;
            }
            .services-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: var(--spacing-sm);
            }
            .numbers-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: var(--spacing-sm);
            }
            .comparison-wrapper {
                grid-template-columns: 1fr;
                gap: var(--spacing-md);
            }
            .section-title {
                font-size: 28px;
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
            }
            .nav-cta-btn {
                display: none;
            }
            .nav-hamburger {
                display: flex;
            }
            .hero {
                min-height: auto;
                padding: calc(var(--nav-height) + 40px) 0 40px;
            }
            .hero .container {
                grid-template-columns: 1fr;
                gap: 28px;
                text-align: center;
            }
            .hero h1 {
                font-size: 28px;
            }
            .hero-subtitle {
                font-size: 15px;
            }
            .hero-visual img {
                max-width: 280px;
                margin: 0 auto;
                border-radius: var(--radius-lg);
            }
            .hero-actions {
                flex-direction: column;
                align-items: center;
            }
            .btn-lg {
                width: 100%;
                max-width: 320px;
            }
            .services-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .service-item {
                padding: 20px 14px 16px;
            }
            .service-icon-wrap {
                width: 48px;
                height: 48px;
            }
            .service-name {
                font-size: 15px;
            }
            .numbers-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .number-card {
                padding: 20px 14px;
            }
            .number-value {
                font-size: 28px;
            }
            .comparison-wrapper {
                grid-template-columns: 1fr;
            }
            .section-title {
                font-size: 24px;
            }
            .contact-card {
                padding: 28px 18px;
                border-radius: var(--radius-lg);
            }
            .faq-question {
                padding: 14px 16px;
                font-size: 14px;
            }
            .faq-answer-inner {
                padding: 0 16px 14px 32px;
                font-size: 13px;
            }
            :root {
                --spacing-3xl: 60px;
                --spacing-xl: 40px;
            }
            .section-header {
                margin-bottom: var(--spacing-lg);
            }
            .container {
                padding: 0 16px;
            }
            .nav-inner {
                padding: 0 16px;
            }
        }

        @media (max-width: 520px) {
            .services-grid {
                grid-template-columns: 1fr;
                gap: 10px;
            }
            .numbers-grid {
                grid-template-columns: 1fr 1fr;
                gap: 8px;
            }
            .number-card {
                padding: 16px 10px;
            }
            .number-value {
                font-size: 24px;
            }
            .hero h1 {
                font-size: 24px;
            }
            .hero-subtitle {
                font-size: 14px;
            }
            .hero-badge {
                font-size: 12px;
                padding: 5px 12px;
            }
            .comparison-card {
                padding: 20px 14px;
            }
            .comparison-card h3 {
                font-size: 17px;
            }
            .footer-links {
                gap: 12px;
            }
        }

        /* 辅助类 */
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border-width: 0;
        }

        /* 选中文本 */
        ::selection {
            background: rgba(37, 99, 235, 0.2);
            color: var(--text-heading);
        }