/* ==================== 全局样式 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
}

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

/* ==================== 头部导航 ==================== */
.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.header-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: bold;
    text-decoration: none;
    color: white;
}

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

.logo-text {
    font-size: 20px;
}

/* PC导航菜单 */
.nav-pc {
    display: flex;
    gap: 30px;
    align-items: center;
}

.nav-link {
    color: white;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: opacity 0.3s ease;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    opacity: 0.8;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: white;
    transition: width 0.3s ease;
}

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

/* 菜单切换按钮 */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: white;
    border-radius: 2px;
    transition: all 0.3s ease;
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

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

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* 手机端侧滑菜单 */
.nav-mobile {
    display: none;
    position: fixed;
    right: -100%;
    top: 0;
    width: 100%;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.95);
    flex-direction: column;
    padding-top: 80px;
    z-index: 99;
    transition: right 0.3s ease;
    overflow-y: auto;
}

.nav-mobile.active {
    right: 0;
}

.nav-link-mobile {
    color: white;
    text-decoration: none;
    padding: 15px 20px;
    font-size: 16px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    transition: background-color 0.3s ease;
}

.nav-link-mobile:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* ==================== Hero Section ==================== */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 80px 0;
    text-align: center;
}

.hero-content h1 {
    font-size: 48px;
    margin-bottom: 20px;
    font-weight: 700;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 24px;
    margin-bottom: 15px;
    font-weight: 500;
}

.hero-description {
    font-size: 16px;
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.8;
    opacity: 0.95;
}

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

.btn {
    display: inline-block;
    padding: 15px 40px;
    border-radius: 50px;
    text-decoration: none;
    font-size: 16px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    cursor: pointer;
}

.btn-primary {
    background-color: white;
    color: #667eea;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.btn-secondary {
    background-color: transparent;
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* ==================== 快速导航卡片 ==================== */
.quick-nav {
    padding: 60px 0;
    background-color: #f8f9fa;
}

.quick-nav h2 {
    text-align: center;
    font-size: 32px;
    margin-bottom: 50px;
    color: #333;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.card {
    background: white;
    padding: 40px 30px;
    border-radius: 10px;
    text-align: center;
    text-decoration: none;
    color: #333;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    border: 1px solid #eee;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    border-color: #667eea;
}

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

.card h3 {
    font-size: 20px;
    margin-bottom: 10px;
    color: #333;
}

.card p {
    font-size: 14px;
    color: #666;
}

/* ==================== 功能亮点 ==================== */
.highlights {
    padding: 60px 0;
    background-color: white;
}

.highlights h2 {
    text-align: center;
    font-size: 32px;
    margin-bottom: 50px;
    color: #333;
}

.highlights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.highlight-item {
    text-align: center;
    padding: 30px 20px;
}

.highlight-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 50%;
    font-size: 28px;
    font-weight: bold;
    margin-bottom: 20px;
}

.highlight-item h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: #333;
}

.highlight-item p {
    font-size: 14px;
    color: #666;
    line-height: 1.8;
}

/* ==================== 下载快速入口 ==================== */
.download-quick {
    padding: 60px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.download-quick h2 {
    text-align: center;
    font-size: 32px;
    margin-bottom: 10px;
}

.section-subtitle {
    text-align: center;
    font-size: 16px;
    margin-bottom: 40px;
    opacity: 0.95;
}

.download-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.download-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 30px 20px;
    background-color: rgba(255, 255, 255, 0.15);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 10px;
    color: white;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
}

.download-btn:hover {
    background-color: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-5px);
}

.method-icon {
    font-size: 32px;
    margin-bottom: 10px;
}

.method-name {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 5px;
}

.method-desc {
    font-size: 12px;
    opacity: 0.8;
}

/* ==================== SEO内容区 ==================== */
.seo-content {
    padding: 60px 0;
    background-color: #f8f9fa;
}

.seo-content h2 {
    font-size: 32px;
    margin-bottom: 40px;
    color: #333;
}

.seo-content article {
    background: white;
    padding: 40px;
    border-radius: 10px;
    line-height: 1.8;
}

.seo-content p {
    margin-bottom: 20px;
    color: #555;
    font-size: 15px;
}

.seo-content h3 {
    font-size: 22px;
    margin: 30px 0 20px;
    color: #333;
}

.seo-content ul,
.seo-content ol {
    margin-left: 30px;
    margin-bottom: 20px;
}

.seo-content li {
    margin-bottom: 10px;
    color: #555;
    font-size: 15px;
}

.seo-content strong {
    color: #667eea;
}

/* ==================== 底部 ==================== */
.footer {
    background-color: #2c3e50;
    color: white;
    padding: 40px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 30px;
}

.footer-section h4 {
    font-size: 16px;
    margin-bottom: 20px;
    color: white;
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: 10px;
}

.footer-section a {
    color: #bbb;
    text-decoration: none;
    transition: color 0.3s ease;
    font-size: 14px;
}

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 13px;
    color: #999;
}

.footer-bottom a {
    color: #bbb;
    text-decoration: none;
}

.footer-bottom a:hover {
    color: white;
}

/* ==================== 返回顶部按钮 ==================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 24px;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    z-index: 98;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.back-to-top.show {
    display: flex;
}

/* 手机端侧滑菜单 */
.nav-mobile {
    display: none;
    position: fixed;
    right: -280px;           /* ✅ 改为固定值 */
    top: 0;
    width: 280px;            /* ✅ 改为固定宽度 */
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.95);
    flex-direction: column;
    padding-top: 80px;
    z-index: 99;
    transition: right 0.3s ease;
    overflow-y: auto;
}

.nav-mobile.active {
    right: 0;
}

.nav-link-mobile {
    color: white;
    text-decoration: none;
    padding: 15px 20px;
    font-size: 16px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    transition: background-color 0.3s ease;
}

.nav-link-mobile:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* 响应式调整 */
@media (max-width: 480px) {
    .nav-mobile {
        right: -240px;
        width: 240px;
    }
    
    .nav-link-mobile {
        padding: 12px 15px;
        font-size: 15px;
    }
}

@media (max-width: 360px) {
    .nav-mobile {
        right: -200px;
        width: 200px;
    }
    
    .nav-link-mobile {
        padding: 10px 12px;
        font-size: 14px;
    }
}

/* ==================== 性能优化 ==================== */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* 打印样式 */
@media print {
    .header,
    .footer,
    .back-to-top,
    .cta-buttons {
        display: none;
    }
}