/* ========================================
   快连VPN 网站样式
   ======================================== */

/* 变量定义 */
:root {
    --primary: #4f46e5;
    --primary-dark: #4338ca;
    --primary-light: #818cf8;
    --secondary: #1e293b;
    --accent: #06b6d4;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --radius: 12px;
    --radius-lg: 20px;
}

/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
    line-height: 1.6;
    color: var(--gray-800);
    background: #fff;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.3s;
}

a:hover {
    color: var(--primary-dark);
}

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

ul {
    list-style: none;
}

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

/* ========================================
   导航栏
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--gray-200);
    z-index: 1000;
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 20px;
    font-weight: 700;
    color: var(--secondary);
}

.logo-icon {
    font-size: 28px;
}

.logo:hover {
    color: var(--primary);
}

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

.nav-menu a {
    font-weight: 500;
    color: var(--gray-600);
    padding: 8px 0;
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width 0.3s;
}

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

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

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

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--gray-700);
    transition: all 0.3s;
}

/* ========================================
   Hero区域
   ======================================== */
.hero {
    padding: 160px 0 100px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: relative;
    z-index: 1;
}

.hero-content {
    flex: 1;
    max-width: 600px;
    color: #fff;
}

.hero-title {
    font-size: 48px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
}

.hero-subtitle {
    font-size: 20px;
    opacity: 0.9;
    margin-bottom: 32px;
}

.hero-actions {
    display: flex;
    gap: 16px;
}

.hero-visual {
    flex: 0 0 300px;
}

/* 球体动画 */
.globe {
    width: 300px;
    height: 300px;
    position: relative;
}

.globe-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    animation: pulse 3s ease-in-out infinite;
}

.globe-ring:nth-child(1) {
    width: 150px;
    height: 150px;
    animation-delay: 0s;
}

.globe-ring:nth-child(2) {
    width: 220px;
    height: 220px;
    animation-delay: 0.5s;
}

.globe-ring:nth-child(3) {
    width: 290px;
    height: 290px;
    animation-delay: 1s;
}

@keyframes pulse {
    0%, 100% {
        opacity: 0.3;
        transform: translate(-50%, -50%) scale(1);
    }
    50% {
        opacity: 0.6;
        transform: translate(-50%, -50%) scale(1.05);
    }
}

/* ========================================
   按钮
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    font-size: 16px;
    font-weight: 600;
    border-radius: var(--radius);
    border: none;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary {
    background: #fff;
    color: var(--primary);
}

.btn-primary:hover {
    background: var(--gray-100);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-outline {
    background: transparent;
    color: #fff;
    border: 2px solid rgba(255, 255, 255, 0.5);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: #fff;
}

.btn-lg {
    padding: 16px 32px;
    font-size: 18px;
}

.btn-icon {
    font-size: 20px;
}

/* ========================================
   区域通用样式
   ======================================== */
section {
    padding: 80px 0;
}

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

.section-header h2 {
    font-size: 36px;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: 12px;
}

.section-header p {
    font-size: 18px;
    color: var(--gray-500);
}

.section-footer {
    text-align: center;
    margin-top: 40px;
}

/* ========================================
   功能特点
   ======================================== */
.features {
    background: var(--gray-50);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    background: #fff;
    padding: 32px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    transition: all 0.3s;
}

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

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

.feature-card h3 {
    font-size: 20px;
    color: var(--secondary);
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--gray-600);
    line-height: 1.7;
}

/* ========================================
   下载区域
   ======================================== */
.download {
    background: linear-gradient(180deg, #fff 0%, var(--gray-50) 100%);
}

.download-cards {
    display: flex;
    justify-content: center;
    gap: 32px;
    flex-wrap: wrap;
}

.download-card {
    background: #fff;
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    text-align: center;
    width: 320px;
    transition: all 0.3s;
}

.download-card:hover {
    transform: translateY(-8px);
}

.download-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 24px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
}

.download-icon svg {
    width: 40px;
    height: 40px;
}

.download-card h3 {
    font-size: 24px;
    margin-bottom: 8px;
}

.download-card p {
    color: var(--gray-500);
    margin-bottom: 24px;
}

.download-card .btn {
    width: 100%;
}

.download-info {
    margin-top: 16px;
    font-size: 14px;
    color: var(--gray-400);
    display: flex;
    justify-content: center;
    gap: 8px;
}

.download-note {
    margin-top: 48px;
    padding: 24px;
    background: var(--gray-100);
    border-radius: var(--radius);
    text-align: left;
}

.download-note h4 {
    margin-bottom: 12px;
}

.download-note ul {
    margin-top: 12px;
    padding-left: 20px;
    list-style: disc;
}

.download-note li {
    margin: 8px 0;
    color: var(--gray-600);
}

/* ========================================
   最新文章
   ======================================== */
.latest-articles {
    background: #fff;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.article-card {
    background: var(--gray-50);
    padding: 24px;
    border-radius: var(--radius);
    transition: all 0.3s;
}

.article-card:hover {
    background: #fff;
    box-shadow: var(--shadow);
}

.article-card h2 {
    font-size: 18px;
    margin-bottom: 12px;
    line-height: 1.4;
}

.article-card h2 a {
    color: var(--secondary);
}

.article-card h2 a:hover {
    color: var(--primary);
}

.article-meta {
    font-size: 14px;
    color: var(--gray-400);
    margin-bottom: 12px;
}

.article-excerpt {
    color: var(--gray-600);
    font-size: 15px;
    line-height: 1.7;
    margin-bottom: 16px;
}

.read-more {
    font-size: 14px;
    font-weight: 600;
}

.loading, .empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 60px 20px;
    color: var(--gray-400);
}

/* ========================================
   FAQ
   ======================================== */
.faq {
    background: var(--gray-50);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: #fff;
    border-radius: var(--radius);
    margin-bottom: 16px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    background: none;
    border: none;
    font-size: 16px;
    font-weight: 600;
    color: var(--secondary);
    cursor: pointer;
    text-align: left;
}

.faq-icon {
    font-size: 24px;
    font-weight: 300;
    transition: transform 0.3s;
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s;
}

.faq-item.active .faq-answer {
    max-height: 200px;
}

.faq-answer p {
    padding: 0 24px 20px;
    color: var(--gray-600);
    line-height: 1.7;
}

/* ========================================
   页脚
   ======================================== */
.footer {
    background: var(--secondary);
    color: rgba(255, 255, 255, 0.7);
    padding: 60px 0 24px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 40px;
}

.footer-col h3,
.footer-col h4 {
    color: #fff;
    margin-bottom: 20px;
}

.footer-col h3 {
    font-size: 20px;
}

.footer-col p {
    line-height: 1.7;
}

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

.footer-col ul a {
    color: rgba(255, 255, 255, 0.7);
}

.footer-col ul a:hover {
    color: #fff;
}

.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.7);
}

.footer-bottom a:hover {
    color: #fff;
}

/* ========================================
   通用页面样式
   ======================================== */
.main {
    padding-top: 120px;
    padding-bottom: 80px;
    min-height: 60vh;
}

.breadcrumb {
    font-size: 14px;
    color: var(--gray-400);
    margin-bottom: 24px;
}

.breadcrumb a {
    color: var(--gray-500);
}

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

.page-header {
    margin-bottom: 40px;
}

.page-header h1 {
    font-size: 36px;
    color: var(--secondary);
    margin-bottom: 12px;
}

.page-header p {
    color: var(--gray-500);
    font-size: 18px;
}

/* ========================================
   文章列表页
   ======================================== */
.articles-container {
    margin-bottom: 40px;
}

.articles-list {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.articles-list .article-card {
    padding: 32px;
}

/* ========================================
   分页
   ======================================== */
.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
}

.page-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 12px;
    background: #fff;
    border: 1px solid var(--gray-200);
    border-radius: 8px;
    color: var(--gray-600);
    font-size: 14px;
    transition: all 0.3s;
}

.page-btn:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}

.page-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}

.page-ellipsis {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    color: var(--gray-400);
}

/* ========================================
   关于页面
   ======================================== */
.about-content {
    max-width: 800px;
}

.about-section {
    margin-bottom: 48px;
}

.about-section h2 {
    font-size: 28px;
    color: var(--secondary);
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--primary);
}

.about-section p {
    color: var(--gray-600);
    line-height: 1.8;
    margin-bottom: 16px;
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.value-item {
    padding: 24px;
    background: var(--gray-50);
    border-radius: var(--radius);
}

.value-icon {
    font-size: 36px;
    margin-bottom: 16px;
}

.value-item h3 {
    font-size: 18px;
    margin-bottom: 8px;
}

.value-item p {
    font-size: 15px;
    margin-bottom: 0;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: var(--gray-50);
    border-radius: 8px;
}

.contact-icon {
    font-size: 24px;
}

.terms h3 {
    font-size: 18px;
    margin: 24px 0 12px;
}

.terms h3:first-child {
    margin-top: 0;
}

/* ========================================
   文章详情页
   ======================================== */
.article {
    max-width: 800px;
    margin: 0 auto;
}

.article-header {
    margin-bottom: 32px;
}

.article-title {
    font-size: 36px;
    color: var(--secondary);
    line-height: 1.3;
    margin-bottom: 16px;
}

.article-meta {
    color: var(--gray-400);
    font-size: 14px;
}

.article-content {
    font-size: 17px;
    line-height: 1.9;
    color: var(--gray-700);
}

.article-content h2 {
    font-size: 26px;
    color: var(--secondary);
    margin: 40px 0 20px;
}

.article-content h3 {
    font-size: 22px;
    color: var(--secondary);
    margin: 32px 0 16px;
}

.article-content p {
    margin: 16px 0;
}

.article-content img {
    border-radius: 8px;
    margin: 24px 0;
}

.article-content ul,
.article-content ol {
    margin: 16px 0;
    padding-left: 24px;
}

.article-content li {
    margin: 8px 0;
}

.article-content a {
    color: var(--primary);
}

.article-content blockquote {
    margin: 24px 0;
    padding: 16px 24px;
    background: var(--gray-50);
    border-left: 4px solid var(--primary);
    border-radius: 0 8px 8px 0;
}

.article-footer {
    margin-top: 48px;
    padding-top: 24px;
    border-top: 1px solid var(--gray-200);
}

.article-tags a {
    display: inline-block;
    padding: 4px 12px;
    background: var(--gray-100);
    border-radius: 16px;
    font-size: 14px;
    margin-right: 8px;
}

.article-nav {
    margin-top: 24px;
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 1024px) {
    .hero .container {
        flex-direction: column;
        text-align: center;
    }

    .hero-content {
        margin-bottom: 48px;
    }

    .hero-actions {
        justify-content: center;
    }

    .hero-visual {
        display: none;
    }

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

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

/* ========================================
   Hero徽章
   ======================================== */
.hero-badges {
    display: flex;
    gap: 12px;
    margin-top: 24px;
    flex-wrap: wrap;
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 6px 14px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    font-size: 13px;
    color: #fff;
    backdrop-filter: blur(4px);
}

/* ========================================
   数据统计区域
   ======================================== */
.stats-section {
    background: #fff;
    padding: 40px 0;
    margin-top: -40px;
    position: relative;
    z-index: 10;
}

.stats-section .container {
    background: #fff;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 40px;
}

.stats-section .stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    text-align: center;
}

.stats-section .stat-item {
    padding: 20px;
}

.stats-section .stat-number {
    font-size: 42px;
    font-weight: 800;
    color: var(--primary);
    line-height: 1.2;
}

.stats-section .stat-unit {
    font-size: 24px;
}

.stats-section .stat-label {
    font-size: 14px;
    color: var(--gray-500);
    margin-top: 8px;
}

/* ========================================
   使用步骤
   ======================================== */
.steps-section {
    background: var(--gray-50);
}

.steps-grid {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 20px;
}

.step-card {
    flex: 1;
    max-width: 300px;
    text-align: center;
    padding: 32px 24px;
    background: #fff;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    position: relative;
}

.step-number {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 30px;
    background: var(--primary);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 14px;
}

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

.step-card h3 {
    font-size: 18px;
    margin-bottom: 8px;
    color: var(--secondary);
}

.step-card p {
    font-size: 14px;
    color: var(--gray-500);
}

.step-connector {
    width: 80px;
    height: 2px;
    background: var(--gray-300);
    margin-top: 60px;
    position: relative;
}

.step-connector::after {
    content: '→';
    position: absolute;
    right: -20px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray-400);
    font-size: 20px;
}

/* ========================================
   下载卡片图标颜色
   ======================================== */
.download-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 24px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
}

.download-icon svg {
    width: 40px;
    height: 40px;
}

.download-icon.windows { background: linear-gradient(135deg, #00A4EF 0%, #0078D4 100%); }
.download-icon.mac { background: linear-gradient(135deg, #555 0%, #333 100%); }
.download-icon.android { background: linear-gradient(135deg, #3DDC84 0%, #1F9653 100%); }
.download-icon.ios { background: linear-gradient(135deg, #555 0%, #333 100%); }

.btn-outline-dark {
    background: transparent;
    color: var(--gray-700);
    border: 2px solid var(--gray-300);
}

.btn-outline-dark:hover {
    background: var(--gray-100);
    border-color: var(--gray-400);
}

/* ========================================
   价格方案
   ======================================== */
.pricing-section {
    background: linear-gradient(180deg, var(--gray-50) 0%, #fff 100%);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 40px;
}

.pricing-card {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
    position: relative;
    transition: all 0.3s;
}

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

.pricing-card.featured {
    border: 2px solid var(--primary);
    transform: scale(1.05);
}

.pricing-card.featured:hover {
    transform: scale(1.05) translateY(-8px);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary);
    color: #fff;
    padding: 6px 20px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.pricing-header {
    text-align: center;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--gray-200);
    margin-bottom: 24px;
}

.pricing-header h3 {
    font-size: 20px;
    margin-bottom: 16px;
}

.price {
    display: flex;
    align-items: baseline;
    justify-content: center;
}

.currency {
    font-size: 24px;
    color: var(--danger);
}

.amount {
    font-size: 48px;
    font-weight: 800;
    color: var(--danger);
}

.period {
    font-size: 16px;
    color: var(--gray-500);
    margin-left: 4px;
}

.price-note {
    font-size: 13px;
    color: var(--gray-400);
    margin-top: 8px;
}

.pricing-features {
    margin-bottom: 24px;
}

.pricing-features li {
    display: flex;
    align-items: center;
    padding: 10px 0;
    font-size: 15px;
    color: var(--gray-600);
}

.pricing-features li.disabled {
    color: var(--gray-400);
}

.check {
    color: var(--success);
    font-weight: bold;
    margin-right: 10px;
}

.cross {
    color: var(--gray-400);
    margin-right: 10px;
}

.btn-block {
    display: block;
    width: 100%;
    text-align: center;
}

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

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

.pricing-guarantee {
    text-align: center;
    padding: 20px;
    background: var(--gray-50);
    border-radius: var(--radius);
    color: var(--gray-600);
    font-size: 14px;
}

.guarantee-icon {
    margin-right: 8px;
}

/* ========================================
   用户评价
   ======================================== */
.testimonials-section {
    background: #fff;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.testimonial-card {
    background: var(--gray-50);
    padding: 32px;
    border-radius: var(--radius-lg);
    transition: all 0.3s;
}

.testimonial-card:hover {
    background: #fff;
    box-shadow: var(--shadow);
}

.testimonial-rating {
    color: #fbbf24;
    font-size: 18px;
    margin-bottom: 16px;
}

.testimonial-text {
    font-size: 15px;
    line-height: 1.8;
    color: var(--gray-700);
    margin-bottom: 24px;
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 12px;
}

.author-avatar {
    width: 48px;
    height: 48px;
    background: var(--primary);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
}

.author-info {
    display: flex;
    flex-direction: column;
}

.author-info strong {
    font-size: 15px;
    color: var(--secondary);
}

.author-info span {
    font-size: 13px;
    color: var(--gray-400);
}

/* ========================================
   合作伙伴
   ======================================== */
.partners-section {
    background: var(--gray-50);
}

.partners-grid {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 40px;
}

.partner-logo {
    padding: 20px 40px;
    background: #fff;
    border-radius: var(--radius);
    font-size: 20px;
    font-weight: 600;
    color: var(--gray-400);
    box-shadow: var(--shadow);
}

/* ========================================
   CTA区域
   ======================================== */
.cta-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 80px 0;
    text-align: center;
}

.cta-content {
    max-width: 600px;
    margin: 0 auto;
    color: #fff;
}

.cta-content h2 {
    font-size: 36px;
    margin-bottom: 16px;
}

.cta-content p {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: 32px;
}

.cta-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
}

.btn-outline-white {
    background: transparent;
    color: #fff;
    border: 2px solid rgba(255, 255, 255, 0.5);
}

.btn-outline-white:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: #fff;
    color: #fff;
}

/* ========================================
   页脚社交
   ======================================== */
.footer-social {
    display: flex;
    gap: 12px;
    margin-top: 16px;
}

.social-link {
    width: 40px;
    height: 40px;
    background: var(--gray-800);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    transition: all 0.3s;
}

.social-link:hover {
    background: var(--primary);
    transform: translateY(-3px);
}

.contact-list li {
    padding: 8px 0;
    font-size: 14px;
}

/* ========================================
   响应式
   ======================================== */
@media (max-width: 1024px) {
    .hero .container {
        flex-direction: column;
        text-align: center;
    }

    .hero-content {
        margin-bottom: 48px;
    }

    .hero-actions {
        justify-content: center;
    }

    .hero-visual {
        display: none;
    }

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

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

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

    .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin-left: auto;
        margin-right: auto;
    }

    .pricing-card.featured {
        transform: none;
    }

    .pricing-card.featured:hover {
        transform: translateY(-8px);
    }

    .testimonials-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin: 0 auto;
    }

    .steps-grid {
        flex-direction: column;
        align-items: center;
    }

    .step-connector {
        width: 2px;
        height: 40px;
        margin: 0 auto;
    }

    .step-connector::after {
        content: '↓';
        right: auto;
        top: auto;
        left: 50%;
        transform: translateX(-50%);
        bottom: -20px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 16px;
        gap: 0;
        border-bottom: 1px solid var(--gray-200);
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-menu li {
        border-bottom: 1px solid var(--gray-100);
    }

    .nav-menu a {
        display: block;
        padding: 16px 0;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    .hero {
        padding: 120px 0 60px;
    }

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

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

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

    section {
        padding: 60px 0;
    }

    .section-header h2 {
        font-size: 28px;
    }

    .features-grid,
    .articles-grid,
    .values-grid {
        grid-template-columns: 1fr;
    }

    .download-card {
        width: 100%;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .page-header h1 {
        font-size: 28px;
    }

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

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

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

    .partners-grid {
        gap: 20px;
    }

    .partner-logo {
        padding: 15px 30px;
        font-size: 16px;
    }
}