/* ChainlessChain 官网样式文件 */
/* ========================================
   目录：
   1. 全局样式和布局
   2. 导航栏
   3. Hero区域
   4. 核心价值主张
   5. 产品卡片
   6. 竞品对比
   7. 下载区域
   8. FAQ
   9. 功能特性
   10. 技术栈
   11. 应用场景
   12. 关于我们
   13. 联系我们
   14. 页脚
   15. 响应式设计
   ======================================== */

/* ========================================
   1. 全局样式和布局
   ======================================== */
:root {
    --primary-color: #1890ff;
    --secondary-color: #667eea;
    --accent-color: #764ba2;
    --success-color: #52c41a;
    --warning-color: #faad14;
    --error-color: #f5222d;
    --text-primary: #2c3e50;
    --text-secondary: #6c757d;
    --text-light: #999;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --border-color: #e8e8e8;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB',
                 'Microsoft YaHei', sans-serif;
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ========================================
   2. 导航栏
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

.logo-image {
    width: 40px;
    height: 40px;
}

.logo-text-wrapper {
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo-icon::before {
    content: "";
    font-size: 32px;
}

.nav-menu {
    display: flex;
    gap: 32px;
}

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.btn-outline {
    padding: 8px 20px;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
    background: transparent;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.btn-outline:hover {
    background: var(--primary-color);
    color: white;
}

.btn-primary {
    padding: 10px 24px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary:hover {
    background: #0d7ae4;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
}

/* ========================================
   3. Hero区域
   ======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    position: relative;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.hero-gradient {
    position: absolute;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    opacity: 0.95;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: white;
}

.hero-title {
    font-size: 56px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 24px;
    animation: fadeInUp 0.8s ease-out;
}

.hero-title .highlight {
    background: linear-gradient(90deg, #ffd700, #ffed4e);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 版本标识 */
.version-tags {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 24px;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease-out 0.1s both;
}

.version-tag {
    background: rgba(255, 255, 255, 0.25);
    backdrop-filter: blur(10px);
    padding: 10px 20px;
    border-radius: 25px;
    font-size: 15px;
    font-weight: 600;
    border: 2px solid rgba(255, 255, 255, 0.4);
}

.version-tag.personal {
    background: rgba(24, 144, 255, 0.3);
}

.version-tag.enterprise {
    background: rgba(82, 196, 26, 0.3);
}

.trust-badges {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 24px;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.badge {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
}

.hero-subtitle {
    font-size: 20px;
    line-height: 1.8;
    margin-bottom: 40px;
    opacity: 0.95;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

.hero-cta {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 32px;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease-out 0.6s both;
}

.btn-hero-primary,
.btn-hero-secondary,
.btn-hero-phone {
    padding: 16px 32px;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-hero-primary {
    background: white;
    color: var(--primary-color);
    flex-direction: column;
    align-items: center;
}

.btn-hero-primary:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.2);
}

.btn-icon {
    font-size: 18px;
    margin-right: 4px;
}

.btn-hero-primary .btn-icon {
    font-size: 24px;
    margin: 0 0 4px 0;
}

.btn-hero-primary .btn-sub {
    font-size: 12px;
    opacity: 0.8;
}

.btn-hero-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: 2px solid white;
}

.btn-hero-secondary:hover {
    background: white;
    color: var(--primary-color);
}

.btn-hero-phone {
    background: rgba(255, 255, 255, 0.15);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-hero-phone:hover {
    background: rgba(255, 255, 255, 0.25);
}

.quick-nav {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease-out 0.8s both;
}

.quick-nav-label {
    font-weight: 600;
}

.quick-nav-link {
    color: white;
    text-decoration: none;
    padding: 6px 16px;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.15);
    transition: var(--transition);
}

.quick-nav-link:hover {
    background: rgba(255, 255, 255, 0.3);
}

.social-proof {
    animation: fadeInUp 0.8s ease-out 1s both;
}

.social-proof p {
    font-size: 16px;
    opacity: 0.9;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 40px;
    margin-top: 60px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 42px;
    font-weight: 800;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 14px;
    opacity: 0.9;
}

/* 动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fade-in {
    animation: fadeInUp 0.8s ease-out;
}

.animate-fade-in-delay {
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.animate-fade-in-delay-2 {
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

.animate-fade-in-delay-3 {
    animation: fadeInUp 0.8s ease-out 0.6s both;
}

/* ========================================
   4. 核心价值主张
   ======================================== */
.value-proposition {
    background: var(--bg-light);
    padding: 60px 0;
}

.value-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 32px;
}

.value-item {
    background: white;
    padding: 32px;
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition);
}

.value-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.value-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.value-item h3 {
    font-size: 20px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.value-item p {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ========================================
   5. 产品卡片
   ======================================== */
.products {
    background: white;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
}

.product-card {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px;
    transition: var(--transition);
    position: relative;
}

.product-card.featured {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.featured-badge {
    position: absolute;
    top: -12px;
    right: 24px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.product-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.product-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.pain-points {
    background: #fff5f5;
    border-left: 3px solid var(--error-color);
    padding: 12px;
    margin-bottom: 16px;
    border-radius: var(--radius-sm);
}

.pain-point {
    font-size: 14px;
    color: var(--text-secondary);
    margin: 4px 0;
}

.solutions {
    background: #f6ffed;
    border-left: 3px solid var(--success-color);
    padding: 12px;
    margin-bottom: 20px;
    border-radius: var(--radius-sm);
}

.solution {
    font-size: 14px;
    color: var(--text-primary);
    margin: 4px 0;
    font-weight: 500;
}

.product-features {
    list-style: none;
    margin: 20px 0;
}

.product-features li {
    padding: 8px 0;
    padding-left: 24px;
    position: relative;
    color: var(--text-secondary);
}

.product-features li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: 700;
}

.target-users {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 20px 0;
}

.user-tag {
    background: var(--bg-light);
    color: var(--text-primary);
    padding: 4px 12px;
    border-radius: 16px;
    font-size: 12px;
}

.testimonial-mini {
    background: var(--bg-light);
    border-left: 3px solid var(--primary-color);
    padding: 16px;
    margin: 20px 0;
    font-style: italic;
    border-radius: var(--radius-sm);
}

.testimonial-mini p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.testimonial-mini cite {
    font-size: 12px;
    color: var(--text-light);
    font-style: normal;
}

.product-cta {
    display: flex;
    gap: 12px;
    margin-top: 24px;
}

.btn-product-primary,
.btn-product-outline {
    flex: 1;
    padding: 12px 24px;
    border-radius: var(--radius-md);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

.btn-product-primary {
    background: var(--primary-color);
    color: white;
}

.btn-product-primary:hover {
    background: #0d7ae4;
    transform: translateY(-2px);
}

.btn-product-outline {
    background: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

.btn-product-outline:hover {
    background: var(--primary-color);
    color: white;
}

/* ========================================
   6. 竞品对比
   ======================================== */
.comparison {
    background: var(--bg-light);
}

.comparison-table-wrapper {
    overflow-x: auto;
    margin-bottom: 40px;
}

.comparison-table {
    width: 100%;
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    border-collapse: collapse;
}

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

.comparison-table thead th {
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    color: white;
    font-weight: 600;
}

.comparison-table th.highlight,
.comparison-table td.highlight {
    background: #e6f7ff;
    font-weight: 600;
    color: var(--primary-color);
}

.comparison-table tbody tr:hover {
    background: var(--bg-light);
}

.comparison-cta {
    text-align: center;
}

.btn-primary-large {
    padding: 16px 48px;
    font-size: 18px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary-large:hover {
    background: #0d7ae4;
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

/* ========================================
   7. 下载区域
   ======================================== */
.download {
    background: white;
}

.quick-download {
    text-align: center;
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    color: white;
    padding: 40px;
    border-radius: var(--radius-lg);
    margin-bottom: 60px;
}

.detected-os {
    font-size: 16px;
    margin-bottom: 20px;
}

.detected-os span {
    font-weight: 700;
    font-size: 18px;
}

.btn-download-quick {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 18px 48px;
    background: white;
    color: var(--primary-color);
    border: none;
    border-radius: var(--radius-md);
    font-size: 18px;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    margin-bottom: 20px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.btn-download-quick:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.btn-download-quick .icon {
    font-size: 24px;
    line-height: 1;
}

.download-info {
    display: flex;
    justify-content: center;
    gap: 24px;
    font-size: 14px;
    flex-wrap: wrap;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.download-card {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    text-align: center;
    transition: var(--transition);
    position: relative;
}

.download-card.featured {
    background: linear-gradient(135deg, #f6f9fc, #e9f2ff);
    border-color: var(--primary-color);
}

.download-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.download-icon {
    font-size: 64px;
    margin-bottom: 16px;
}

.download-card h3 {
    font-size: 22px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.download-desc,
.download-version,
.file-size {
    font-size: 14px;
    color: var(--text-secondary);
    margin: 8px 0;
}

.download-version {
    font-weight: 600;
    color: var(--primary-color);
}

.btn-download,
.btn-download-alt,
.btn-download-outline {
    display: block;
    width: 100%;
    padding: 12px 24px;
    margin: 12px 0;
    border-radius: var(--radius-md);
    font-weight: 600;
    text-decoration: none;
    text-align: center;
    transition: var(--transition);
}

.btn-download {
    background: var(--primary-color);
    color: white;
    border: none;
}

.btn-download:hover {
    background: #0d7ae4;
    transform: translateY(-2px);
}

.btn-download-alt {
    background: var(--bg-light);
    color: var(--primary-color);
    border: 1px solid var(--border-color);
}

.btn-download-alt:hover {
    background: #e6f7ff;
}

.btn-download-outline {
    background: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

.btn-download-outline:hover {
    background: var(--primary-color);
    color: white;
}

.btn-download.disabled {
    background: var(--bg-light);
    color: var(--text-light);
    cursor: not-allowed;
}

.btn-notify {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 10px 24px;
    background: var(--bg-light);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
}

.btn-notify:hover {
    background: #fff7e6;
    border-color: var(--warning-color);
    color: var(--warning-color);
}

.qr-code {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.qr-code img {
    width: 120px;
    height: 120px;
    margin-bottom: 8px;
}

.qr-code p {
    font-size: 12px;
    color: var(--text-light);
}

.source-links {
    display: flex;
    gap: 12px;
    margin: 16px 0;
}

.source-link {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px;
    background: var(--bg-light);
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--text-primary);
    transition: var(--transition);
}

.source-link:hover {
    background: #e6f7ff;
    color: var(--primary-color);
}

.download-notice {
    background: #fff7e6;
    border-left: 3px solid var(--warning-color);
    padding: 20px;
    margin-top: 40px;
    border-radius: var(--radius-md);
}

.download-notice a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

.download-notice a:hover {
    text-decoration: underline;
}

/* ========================================
   8. FAQ
   ======================================== */
.faq {
    background: white;
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 32px;
}

.faq-item {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    transition: var(--transition);
}

.faq-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.faq-question {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.faq-question .icon {
    font-size: 24px;
}

.faq-answer {
    color: var(--text-secondary);
    line-height: 1.8;
}

.faq-answer p {
    margin-bottom: 12px;
}

.faq-answer ul {
    margin-left: 20px;
    margin-top: 12px;
}

.faq-answer li {
    margin-bottom: 8px;
}

.faq-answer a {
    color: var(--primary-color);
    text-decoration: none;
}

.faq-answer a:hover {
    text-decoration: underline;
}

/* ========================================
   9. 功能特性
   ======================================== */
.features {
    background: var(--bg-light);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
}

.feature-item {
    background: white;
    padding: 32px;
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition);
}

.feature-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    font-size: 56px;
    margin-bottom: 20px;
}

.feature-item h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-item p {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ========================================
   10. 技术栈
   ======================================== */
.tech-stack {
    background: white;
}

.tech-categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

.tech-category h3 {
    font-size: 20px;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.tech-tag {
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
}

.tech-tag:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ========================================
   11. 应用场景
   ======================================== */
.scenarios {
    background: var(--bg-light);
}

.scenarios-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.scenario-card {
    background: white;
    padding: 32px;
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition);
}

.scenario-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.scenario-icon {
    font-size: 56px;
    margin-bottom: 16px;
}

.scenario-card h3 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.scenario-card p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 16px;
}

.scenario-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.scenario-link:hover {
    text-decoration: underline;
}

/* ========================================
   12. 关于我们
   ======================================== */
.about {
    background: white;
}

.about-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text {

}

.about-description {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 20px;
}

.about-features {
    margin-top: 40px;
}

.about-feature {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
}

.about-feature-icon {
    font-size: 32px;
}

.about-feature h4 {
    font-size: 18px;
    margin-bottom: 6px;
    color: var(--text-primary);
}

.about-feature p {
    font-size: 14px;
    color: var(--text-secondary);
}

.about-stats-card {
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    color: white;
    padding: 48px 32px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.stat-row {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.stat-row:last-child {
    border-bottom: none;
}

.stat-value {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 8px;
}

.stat-desc {
    font-size: 16px;
    opacity: 0.9;
}

/* ========================================
   13. 联系我们
   ======================================== */
.contact {
    background: var(--bg-light);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info h3,
.contact-form h3 {
    font-size: 24px;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.contact-items {
    margin-bottom: 32px;
}

.contact-item {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
}

.contact-icon {
    font-size: 32px;
}

.contact-item h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.contact-item p,
.contact-item a {
    font-size: 14px;
    color: var(--text-secondary);
    text-decoration: none;
}

.contact-phone {
    font-size: 20px !important;
    font-weight: 700 !important;
    color: var(--primary-color) !important;
}

.contact-item a:hover {
    color: var(--primary-color);
}

.social-links {
    display: flex;
    gap: 16px;
}

.social-link {
    padding: 10px 20px;
    background: var(--bg-light);
    color: var(--text-primary);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.social-link:hover {
    background: var(--primary-color);
    color: white;
}

.form-note {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 14px;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(24, 144, 255, 0.1);
}

.form-privacy {
    margin-bottom: 20px;
    font-size: 12px;
    color: var(--text-secondary);
}

.form-privacy a {
    color: var(--primary-color);
    text-decoration: none;
}

.btn-submit {
    width: 100%;
    padding: 14px 32px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-submit:hover {
    background: #0d7ae4;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.form-alternative {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.form-alternative p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.btn-phone-alt {
    display: inline-block;
    padding: 12px 32px;
    background: var(--warning-color);
    color: white;
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: var(--transition);
}

.btn-phone-alt:hover {
    background: #d48806;
    transform: translateY(-2px);
}

/* ========================================
   14. 页脚
   ======================================== */
.footer {
    background: #1a1a1a;
    color: rgba(255, 255, 255, 0.8);
    padding: 60px 0 20px;
}

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

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 700;
    color: white;
    margin-bottom: 16px;
}

.footer-description,
.footer-company {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 12px;
}

.footer-section h4 {
    color: white;
    font-size: 16px;
    margin-bottom: 16px;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: var(--transition);
}

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

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    font-size: 14px;
    margin: 8px 0;
}

/* ========================================
   15. 响应式设计
   ======================================== */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 42px;
    }

    .contact-grid,
    .about-content {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    section {
        padding: 60px 0;
    }

    .section-title {
        font-size: 28px;
    }

    .hero-title {
        font-size: 32px;
    }

    .hero-subtitle {
        font-size: 16px;
    }

    .hero-cta {
        flex-direction: column;
    }

    .nav-menu {
        display: none;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .products-grid,
    .features-grid,
    .scenarios-grid,
    .download-grid {
        grid-template-columns: 1fr;
    }

    .faq-grid {
        grid-template-columns: 1fr;
    }

    .comparison-table {
        font-size: 12px;
    }

    .comparison-table th,
    .comparison-table td {
        padding: 12px 8px;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }

    .tech-categories {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero-title {
        font-size: 24px;
    }

    .trust-badges {
        gap: 8px;
    }

    .badge {
        font-size: 12px;
        padding: 6px 12px;
    }

    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

    .value-grid {
        grid-template-columns: 1fr;
    }

    .product-cta {
        flex-direction: column;
    }
}

/* ========================================
   16. 导航下拉菜单样式
   ======================================== */
.nav-dropdown {
    position: relative;
}

.nav-dropdown > .nav-link::after {
    content: '▼';
    margin-left: 6px;
    font-size: 10px;
    transition: transform 0.3s ease;
}

.nav-dropdown:hover > .nav-link::after {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    min-width: 280px;
    background: white;
    border-radius: var(--radius-md);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    padding: 12px 0;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1000;
}

.nav-dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.dropdown-menu a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
    font-size: 14px;
    line-height: 1.4;
}

.dropdown-menu a:hover {
    background: var(--bg-light);
}

.dropdown-menu a.featured {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    border-left: 3px solid var(--primary-color);
}

.dropdown-menu a.featured:hover {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.15), rgba(118, 75, 162, 0.15));
}

.dropdown-item-content {
    flex: 1;
}

.dropdown-item-title {
    font-weight: 600;
    margin-bottom: 2px;
}

.dropdown-item-desc {
    font-size: 12px;
    color: var(--text-secondary);
}

.dropdown-icon {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}

/* GitHub图标特殊样式 */
.github-icon {
    width: 16px;
    height: 16px;
    fill: currentColor;
}

/* ========================================
   17. 版本对比板块样式
   ======================================== */
.version-comparison {
    background: linear-gradient(180deg, #f8f9fa 0%, #ffffff 100%);
    padding: 100px 0;
}

.version-comparison .section-header {
    margin-bottom: 60px;
}

.comparison-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
    max-width: 1000px;
    margin: 0 auto;
}

.version-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.version-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--secondary-color), var(--accent-color));
}

.version-card.highlight {
    border: 2px solid var(--primary-color);
    transform: scale(1.02);
}

.version-card.highlight .badge {
    position: absolute;
    top: 20px;
    right: 20px;
    background: linear-gradient(135deg, #ff6b6b, #ee5a6f);
    color: white;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(255, 107, 107, 0.3);
}

.version-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.15);
}

.version-card.highlight:hover {
    transform: scale(1.02) translateY(-8px);
}

.version-card h3 {
    font-size: 28px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.version-card .price {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 24px;
    display: flex;
    align-items: baseline;
    gap: 8px;
}

.version-card .price .original-price {
    font-size: 14px;
    color: var(--text-light);
    text-decoration: line-through;
}

.version-card .price-note {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.version-card .features {
    list-style: none;
    margin-bottom: 30px;
}

.version-card .features li {
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 15px;
    line-height: 1.6;
}

.version-card .features li:last-child {
    border-bottom: none;
}

.version-card .core-benefits {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05), rgba(118, 75, 162, 0.05));
    border-radius: var(--radius-md);
    padding: 20px;
    margin-bottom: 24px;
}

.version-card .core-benefits h4 {
    font-size: 16px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.version-card .benefit-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 12px;
}

.version-card .benefit-item:last-child {
    margin-bottom: 0;
}

.version-card .benefit-icon {
    font-size: 20px;
    flex-shrink: 0;
}

.version-card .benefit-text {
    flex: 1;
}

.version-card .benefit-title {
    font-weight: 600;
    margin-bottom: 4px;
    font-size: 14px;
}

.version-card .benefit-desc {
    font-size: 13px;
    color: var(--text-secondary);
}

.version-card .target-audience {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.version-card .target-audience h4 {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.version-card .audience-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.version-card .audience-tag {
    background: var(--bg-light);
    padding: 6px 12px;
    border-radius: 16px;
    font-size: 13px;
    color: var(--text-primary);
}

.version-card .btn {
    width: 100%;
    padding: 14px 24px;
    font-size: 16px;
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: var(--transition);
    display: inline-block;
}

.version-card .btn-primary {
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    color: white;
    border: none;
}

.version-card .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.3);
}

.version-card .btn-outline {
    background: white;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.version-card .btn-outline:hover {
    background: var(--primary-color);
    color: white;
}

/* ========================================
   18. 企业版Spotlight板块样式
   ======================================== */
.enterprise-spotlight {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 120px 0;
    position: relative;
    overflow: hidden;
}

.enterprise-spotlight::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="100" height="100" patternUnits="userSpaceOnUse"><path d="M 100 0 L 0 0 0 100" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="1"/></pattern></defs><rect width="100%" height="100%" fill="url(%23grid)"/></svg>');
    opacity: 0.5;
}

.enterprise-spotlight .container {
    position: relative;
    z-index: 1;
}

.enterprise-spotlight .section-header {
    margin-bottom: 60px;
    text-align: center;
}

.enterprise-spotlight .section-header .label {
    background: rgba(255, 255, 255, 0.2);
    padding: 8px 20px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    display: inline-block;
    margin-bottom: 20px;
    backdrop-filter: blur(10px);
}

.enterprise-spotlight .section-title {
    color: white;
    font-size: 48px;
    margin-bottom: 12px;
    -webkit-background-clip: unset;
    -webkit-text-fill-color: white;
    background-clip: unset;
}

.enterprise-spotlight .section-subtitle {
    color: rgba(255, 255, 255, 0.9);
    font-size: 20px;
}

.spotlight-benefits {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
    margin-bottom: 60px;
}

.benefit-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    padding: 40px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: var(--transition);
}

.benefit-card:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-4px);
}

.benefit-card .icon {
    font-size: 48px;
    margin-bottom: 20px;
    display: block;
}

.benefit-card h3 {
    font-size: 24px;
    margin-bottom: 16px;
    color: white;
}

.benefit-card .content {
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.8;
}

.benefit-card .comparison {
    margin-top: 20px;
}

.benefit-card .comparison-item {
    margin-bottom: 12px;
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.benefit-card .comparison-item:last-child {
    margin-bottom: 0;
}

.benefit-card .comparison-label {
    font-weight: 600;
    margin-bottom: 8px;
}

.benefit-card .traditional-cost {
    background: rgba(255, 255, 255, 0.1);
    padding: 16px;
    border-radius: var(--radius-md);
    margin-bottom: 16px;
}

.benefit-card .traditional-cost p {
    margin: 8px 0;
    font-size: 14px;
}

.benefit-card .chainlesschain-cost {
    background: rgba(82, 196, 26, 0.2);
    padding: 16px;
    border-radius: var(--radius-md);
    border: 2px solid rgba(82, 196, 26, 0.5);
}

.benefit-card .chainlesschain-cost p {
    margin: 8px 0;
    font-size: 14px;
}

.benefit-card .price-highlight {
    font-size: 32px;
    font-weight: 700;
    color: #52c41a;
}

.ai-engines-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-top: 20px;
}

.engine-item {
    background: rgba(255, 255, 255, 0.1);
    padding: 16px;
    border-radius: var(--radius-md);
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: var(--transition);
}

.engine-item:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
}

.engine-item .engine-icon {
    font-size: 32px;
    margin-bottom: 8px;
}

.engine-item .engine-name {
    font-size: 14px;
    font-weight: 600;
}

.engine-more {
    background: rgba(255, 255, 255, 0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
}

.setup-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    margin-top: 40px;
}

.step-item {
    text-align: center;
}

.step-number {
    width: 60px;
    height: 60px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 700;
    margin: 0 auto 16px;
}

.step-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
}

.step-desc {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.8);
}

.spotlight-cta {
    text-align: center;
    margin-top: 60px;
}

.spotlight-cta .cta-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.spotlight-cta .btn {
    padding: 16px 40px;
    font-size: 18px;
    font-weight: 600;
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: var(--transition);
    display: inline-block;
}

.spotlight-cta .btn-white {
    background: white;
    color: var(--secondary-color);
}

.spotlight-cta .btn-white:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(255, 255, 255, 0.3);
}

.spotlight-cta .btn-outline-white {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.spotlight-cta .btn-outline-white:hover {
    background: white;
    color: var(--secondary-color);
}

/* ========================================
   19. 技术透明度板块样式
   ======================================== */
.tech-transparency {
    background: #f8f9fa;
    padding: 100px 0;
}

.tech-transparency .section-header {
    margin-bottom: 60px;
}

/* 统计数据网格 */
.tech-stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 60px;
}

.tech-stat-item {
    background: white;
    padding: 40px 30px;
    border-radius: var(--radius-lg);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    text-align: center;
    transition: all 0.3s ease;
    border-top: 4px solid var(--primary-color);
}

.tech-stat-item:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.tech-stat-item .stat-icon {
    font-size: 48px;
    margin-bottom: 20px;
    display: block;
    line-height: 1;
}

.tech-stat-item .stat-value {
    font-size: 42px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 12px;
    display: block;
    line-height: 1.2;
}

.tech-stat-item .stat-label {
    font-size: 16px;
    color: var(--text-secondary);
    font-weight: 500;
    display: block;
}

/* 保留旧类名兼容 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    margin-bottom: 60px;
}

.stat-card {
    background: white;
    padding: 40px 30px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: var(--transition);
    border-top: 4px solid var(--primary-color);
}

.stat-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.stat-card .stat-icon {
    font-size: 40px;
    margin-bottom: 16px;
}

.stat-card .stat-number {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.stat-card .stat-label {
    font-size: 16px;
    color: var(--text-primary);
    margin-bottom: 8px;
    font-weight: 600;
}

.stat-card .stat-detail {
    font-size: 13px;
    color: var(--text-secondary);
}

.opensource-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    margin-bottom: 60px;
}

.opensource-card {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05), rgba(118, 75, 162, 0.05));
    padding: 40px;
    border-radius: var(--radius-lg);
    border: 2px solid rgba(102, 126, 234, 0.2);
}

.opensource-card h3 {
    font-size: 24px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.opensource-card h3 .icon {
    font-size: 28px;
}

.opensource-card .repo-info {
    display: flex;
    align-items: center;
    gap: 24px;
    margin: 20px 0;
}

.opensource-card .repo-stat {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 16px;
}

.opensource-card .repo-stat .icon {
    color: #ffd700;
}

.opensource-card .repo-links {
    display: flex;
    gap: 16px;
    margin-top: 20px;
}

.opensource-card .repo-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: white;
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--text-primary);
    transition: var(--transition);
}

.opensource-card .repo-link:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.tech-docs-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 60px;
}

.doc-link-card {
    background: white;
    padding: 30px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    text-align: center;
    text-decoration: none;
    color: var(--text-primary);
    transition: var(--transition);
    border: 2px solid transparent;
}

.doc-link-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.doc-link-card .doc-icon {
    font-size: 40px;
    margin-bottom: 16px;
    color: var(--primary-color);
}

.doc-link-card .doc-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
}

.doc-link-card .doc-desc {
    font-size: 14px;
    color: var(--text-secondary);
}

.tech-stack-preview {
    background: white;
    padding: 50px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.tech-stack-preview h3 {
    font-size: 28px;
    text-align: center;
    margin-bottom: 40px;
}

.tech-categories-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 30px;
}

.tech-cat {
    padding: 24px;
    background: white;
    border-radius: var(--radius-md);
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-left: 4px solid var(--primary-color);
    transition: all 0.3s ease;
}

.tech-cat:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    border-left-color: var(--gradient-start);
}

.tech-cat h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.tech-cat span {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
    display: block;
}

/* 保留旧类名兼容 */
.tech-category-item {
    padding: 24px;
    background: var(--bg-light);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary-color);
}

.tech-category-item h4 {
    font-size: 16px;
    margin-bottom: 12px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.tech-category-item h4 .icon {
    font-size: 20px;
}

.tech-category-item .tech-list {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ========================================
   20. 响应式设计 - 新增板块
   ======================================== */
@media (max-width: 1024px) {
    .comparison-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .version-card.highlight {
        transform: scale(1);
    }

    .spotlight-benefits {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .ai-engines-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .setup-steps {
        grid-template-columns: repeat(2, 1fr);
    }

    .stats-grid,
    .tech-stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .tech-categories-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-dropdown {
        position: static;
    }

    .dropdown-menu {
        position: static;
        transform: none;
        box-shadow: none;
        background: var(--bg-light);
        margin-top: 8px;
        border-radius: var(--radius-md);
    }

    .nav-dropdown:hover .dropdown-menu {
        transform: none;
    }

    .comparison-grid {
        grid-template-columns: 1fr;
    }

    .version-card {
        padding: 30px 20px;
    }

    .enterprise-spotlight {
        padding: 80px 0;
    }

    .enterprise-spotlight .section-title {
        font-size: 32px;
    }

    .ai-engines-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .setup-steps {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .spotlight-cta .cta-buttons {
        flex-direction: column;
    }

    .spotlight-cta .btn {
        width: 100%;
    }

    .stats-grid,
    .tech-stats-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .opensource-cards {
        grid-template-columns: 1fr;
    }

    .tech-docs-links {
        grid-template-columns: 1fr;
    }

    .tech-stack-preview {
        padding: 30px 20px;
    }

    .tech-categories-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .version-card h3 {
        font-size: 22px;
    }

    .benefit-card {
        padding: 24px;
    }

    .benefit-card h3 {
        font-size: 20px;
    }

    .ai-engines-grid {
        grid-template-columns: 1fr;
    }

    .spotlight-cta .btn {
        padding: 14px 24px;
        font-size: 16px;
    }

    .stat-card {
        padding: 30px 20px;
    }

    .stat-card .stat-number {
        font-size: 28px;
    }
}