/* 基础样式 */
:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #64748b;
    --accent-color: #10b981;
    --text-color: #1e293b;
    --text-light: #64748b;
    --bg-color: #ffffff;
    --bg-light: #f8fafc;
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --radius: 8px;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    color: var(--text-color);
    line-height: 1.6;
    background-color: var(--bg-color);
}

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

/* 跳过导航 */
.skip-nav {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-color);
    color: white;
    padding: 8px 16px;
    z-index: 1001;
    text-decoration: none;
}

.skip-nav:focus {
    top: 0;
}

/* 头部导航 */
.header {
    background: var(--bg-color);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo img {
    height: 40px;
    width: auto;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

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

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

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

.nav-menu a.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--primary-color);
}

.nav-cta .btn-primary {
    padding: 0.5rem 1.5rem;
}

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

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

/* 按钮样式 */
.btn-primary, .btn-secondary {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    text-align: center;
}

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

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

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

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

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

/* 英雄区域 */
.hero {
    padding: 5rem 0;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
}

.hero .container {
    display: flex;
    align-items: center;
    gap: 4rem;
}

.hero-content {
    flex: 1;
}

.hero h1 {
    font-size: 3rem;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-light);
    margin-bottom: 2rem;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
}

.hero-features {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-light);
}

.hero-image {
    flex: 1;
    text-align: center;
}

.hero-image img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
}

/* 特性区域 */
.features {
    padding: 5rem 0;
}

.features h2, .section-subtitle {
    text-align: center;
    margin-bottom: 1rem;
}

.features h2 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.section-subtitle {
    color: var(--text-light);
    margin-bottom: 3rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-card {
    background: var(--bg-light);
    padding: 2rem;
    border-radius: var(--radius);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.feature-card p {
    color: var(--text-light);
}

/* 下载引导 */
.download-cta {
    padding: 5rem 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    text-align: center;
}

.download-cta h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.download-cta p {
    font-size: 1.125rem;
    margin-bottom: 3rem;
    opacity: 0.9;
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.download-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 150px;
    height: 100px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius);
    text-decoration: none;
    color: white;
    transition: var(--transition);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.download-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-3px);
}

.download-btn span {
    font-weight: 600;
    font-size: 1.1rem;
}

.download-btn small {
    font-size: 0.875rem;
    opacity: 0.8;
    margin-top: 0.25rem;
}

.download-note {
    font-size: 0.875rem;
    opacity: 0.8;
}

/* 新闻动态 */
.news-section {
    padding: 5rem 0;
    background-color: var(--bg-light);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 3rem;
}

.section-header h2 {
    font-size: 2.5rem;
}

.view-all {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.view-all:hover {
    color: var(--primary-dark);
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.news-card {
    background: var(--bg-color);
    border-radius: var(--radius);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.news-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.news-category {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 1rem;
    align-self: flex-start;
}

.category-update {
    background-color: #dbeafe;
    color: #1e40af;
}

.category-security {
    background-color: #dcfce7;
    color: #166534;
}

.category-partnership {
    background-color: #fef3c7;
    color: #92400e;
}

.category-education {
    background-color: #ede9fe;
    color: #5b21b6;
}

.news-content {
    flex: 1;
}

.news-content time {
    font-size: 0.875rem;
    color: var(--text-light);
    display: block;
    margin-bottom: 0.5rem;
}

.news-content h3 {
    font-size: 1.125rem;
    margin-bottom: 0.75rem;
    line-height: 1.4;
}

.news-content h3 a {
    color: var(--text-color);
    text-decoration: none;
    transition: var(--transition);
}

.news-content h3 a:hover {
    color: var(--primary-color);
}

.news-content p {
    color: var(--text-light);
    font-size: 0.9375rem;
    line-height: 1.6;
}

.read-more {
    display: inline-block;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.875rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.read-more:hover {
    color: var(--primary-dark);
}

/* 教程预览 */
.tutorial-preview {
    padding: 5rem 0;
}

.tutorial-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.tutorial-item {
    background: var(--bg-color);
    padding: 2rem;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
}

.tutorial-item h3 {
    margin-bottom: 0.75rem;
}

.tutorial-item h3 a {
    color: var(--text-color);
    text-decoration: none;
    transition: var(--transition);
}

.tutorial-item h3 a:hover {
    color: var(--primary-color);
}

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

/* 页脚 */
.footer {
    background-color: var(--text-color);
    color: white;
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-section h4 {
    font-size: 1.125rem;
    margin-bottom: 1.5rem;
    color: white;
}

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

.footer-section ul li {
    margin-bottom: 0.75rem;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: var(--transition);
}

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

.footer-logo img {
    height: 35px;
    margin-bottom: 1rem;
}

.footer-section p {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    transition: var(--transition);
}

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

address {
    font-style: normal;
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.6;
}

address a {
    color: rgba(255, 255, 255, 0.8);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.875rem;
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
}

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

/* 下载页面特定样式 */
.download-page {
    padding: 4rem 0;
}

.download-page h1 {
    text-align: center;
    margin-bottom: 1rem;
}

.page-subtitle {
    text-align: center;
    color: var(--text-light);
    margin-bottom: 3rem;
}

.download-platform {
    margin-bottom: 4rem;
    background: var(--bg-light);
    border-radius: var(--radius);
    padding: 2rem;
}

.platform-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

.platform-version {
    background: var(--primary-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.875rem;
}

.platform-content {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 3rem;
    align-items: center;
}

.platform-info h3 {
    margin-bottom: 1rem;
    color: var(--text-color);
}

.platform-info ul {
    list-style: none;
    margin: 1.5rem 0;
}

.platform-info li {
    padding: 0.5rem 0;
    position: relative;
    padding-left: 1.5rem;
}

.platform-info li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

.download-links {
    display: flex;
    gap: 1rem;
    margin: 2rem 0;
}

.file-size {
    color: var(--text-light);
    font-size: 0.875rem;
}

.platform-image {
    text-align: center;
}

.platform-image img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.platform-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.desktop-version,
.extension-version {
    background: white;
    padding: 2rem;
    border-radius: var(--radius);
    text-align: center;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.desktop-version:hover,
.extension-version:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.desktop-version h3,
.extension-version h3 {
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.desktop-version p,
.extension-version p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
    font-size: 0.9375rem;
}

@media (max-width: 768px) {
    .platform-content {
        grid-template-columns: 1fr;
    }
    
    .platform-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    .download-links {
        flex-direction: column;
    }
    
    .platform-grid {
        grid-template-columns: 1fr;
    }
}

/* FAQ页面样式 */
.faq-page {
    padding: 4rem 0;
}

.faq-category {
    margin-bottom: 3rem;
}

.faq-item {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    margin-bottom: 1rem;
    overflow: hidden;
}

.faq-question {
    padding: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
}

.faq-question:hover {
    background: var(--bg-light);
}

.faq-answer {
    padding: 0 1.5rem;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-answer.active {
    padding: 0 1.5rem 1.5rem;
    max-height: 1000px;
}

.faq-toggle {
    transition: transform 0.3s ease;
}

.faq-toggle.active {
    transform: rotate(180deg);
}

/* 追加到 style.css 文件末尾 */

/* 面包屑导航样式 */
.breadcrumb {
    background: var(--bg-light);
    padding: 1rem;
    border-radius: var(--radius);
    margin-bottom: 2rem;
}

.breadcrumb ol {
    display: flex;
    align-items: center;
    list-style: none;
    padding: 0;
    margin: 0;
    font-size: 0.875rem;
    flex-wrap: wrap;
}

.breadcrumb li {
    margin-right: 0.5rem;
    display: flex;
    align-items: center;
}

.breadcrumb li:not(:last-child)::after {
    content: '›';
    margin-left: 0.5rem;
    color: var(--text-light);
}

.breadcrumb a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

.breadcrumb a:hover {
    text-decoration: underline;
}

/* 表单错误样式 */
input.error,
textarea.error,
select.error {
    border-color: #ef4444 !important;
}

.error-msg {
    color: #ef4444;
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

/* 夜间模式支持 */
[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --bg-light: #2d2d2d;
    --text-color: #f0f0f0;
    --text-light: #a0a0a0;
    --border-color: #404040;
}

/* 打印样式 */
@media print {
    .header,
    .footer,
    .breadcrumb,
    #back-to-top,
    #dark-mode-toggle {
        display: none !important;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
}