/* 
 * 自媒体视频创作网站样式表
 * 移动端优先设计 - Mobile First
 * 版本: 1.0.0
 */

/* ========================================
   CSS变量定义
   ======================================== */
:root {
    --primary-color: #6B21A8;
    --primary-dark: #581C87;
    --primary-light: #9333EA;
    --secondary-color: #EC4899;
    --accent-color: #F59E0B;
    --text-color: #1F2937;
    --text-light: #6B7280;
    --text-white: #FFFFFF;
    --bg-color: #FFFFFF;
    --bg-light: #F9FAFB;
    --bg-dark: #111827;
    --border-color: #E5E7EB;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Monaco, Consolas, monospace;
    --max-width: 1280px;
    --header-height: 70px;
}

/* ========================================
   基础重置与全局样式
   ======================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.75;
    color: var(--text-color);
    background-color: var(--bg-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul, ol {
    list-style: none;
}

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

address {
    font-style: normal;
}

/* ========================================
   头部导航样式
   ======================================== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    box-shadow: var(--shadow-lg);
    height: var(--header-height);
}

.main-nav {
    height: 100%;
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1rem;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo-link {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.site-logo {
    height: 45px;
    width: auto;
    filter: brightness(0) invert(1);
}

.mobile-menu-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 44px;
    height: 44px;
    padding: 0.5rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    transition: background var(--transition-fast);
}

.mobile-menu-toggle:hover {
    background: rgba(255, 255, 255, 0.2);
}

.menu-icon {
    width: 24px;
    height: 2px;
    background: var(--text-white);
    position: relative;
    transition: background var(--transition-fast);
}

.menu-icon::before,
.menu-icon::after {
    content: '';
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--text-white);
    transition: transform var(--transition-fast);
}

.menu-icon::before {
    top: -7px;
}

.menu-icon::after {
    bottom: -7px;
}

.mobile-menu-toggle[aria-expanded="true"] .menu-icon {
    background: transparent;
}

.mobile-menu-toggle[aria-expanded="true"] .menu-icon::before {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle[aria-expanded="true"] .menu-icon::after {
    transform: rotate(-45deg) translate(5px, -5px);
}

.nav-menu {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--primary-dark);
    padding: 1rem;
    box-shadow: var(--shadow-lg);
}

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

.nav-item {
    margin-bottom: 0.5rem;
}

.nav-item a {
    display: block;
    padding: 0.75rem 1rem;
    color: var(--text-white);
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: background var(--transition-fast);
}

.nav-item a:hover,
.nav-item.active a {
    background: rgba(255, 255, 255, 0.15);
    color: var(--text-white);
}

.nav-item.highlight a {
    background: var(--secondary-color);
    text-align: center;
}

.nav-item.highlight a:hover {
    background: #DB2777;
}

/* ========================================
   主内容区域
   ======================================== */
.main-content {
    flex: 1;
    margin-top: var(--header-height);
    padding: 1.5rem 1rem;
}

/* 面包屑导航 */
.breadcrumb {
    margin-bottom: 1.5rem;
}

.breadcrumb-list {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-light);
}

.breadcrumb-list li:not(:last-child)::after {
    content: '/';
    margin-left: 0.5rem;
    color: var(--border-color);
}

.breadcrumb-list a {
    color: var(--text-light);
}

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

/* 英雄区域 */
.hero-section,
.page-hero,
.download-hero {
    position: relative;
    margin: -1.5rem -1rem 2rem;
    padding: 3rem 1rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--text-white);
    text-align: center;
    overflow: hidden;
}

.hero-image-wrapper {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
}

.hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.3;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.site-title,
.page-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    line-height: 1.3;
}

.site-tagline,
.page-subtitle {
    font-size: 1rem;
    opacity: 0.9;
    margin-bottom: 1.5rem;
}

.cta-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    align-items: center;
}

.cta-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    min-width: 200px;
}

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

.cta-btn.primary:hover {
    background: #DB2777;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.cta-btn.secondary {
    background: rgba(255, 255, 255, 0.2);
    color: var(--text-white);
    border: 2px solid rgba(255, 255, 255, 0.5);
}

.cta-btn.secondary:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* 区块标题 */
.section-header {
    text-align: center;
    margin-bottom: 2rem;
}

.section-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 0.5rem;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

.section-desc {
    color: var(--text-light);
    font-size: 0.9375rem;
    margin-top: 1rem;
}

/* 内容区块 */
section {
    margin-bottom: 3rem;
}

.intro-content,
.guide-content,
.update-content {
    max-width: 800px;
    margin: 0 auto;
}

.intro-content p,
.guide-content p {
    margin-bottom: 1.25rem;
    text-align: justify;
}

/* 特色网格 */
.feature-grid,
.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.feature-item {
    background: var(--bg-light);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
}

.feature-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-item h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.75rem;
}

.feature-item p {
    color: var(--text-light);
    font-size: 0.9375rem;
    line-height: 1.7;
}

/* 视频展示 */
.video-showcase {
    background: var(--bg-light);
    margin: 0 -1rem;
    padding: 2rem 1rem;
}

.video-player {
    margin-bottom: 2rem;
}

.video-container {
    position: relative;
    background: var(--bg-dark);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.video-container video {
    display: block;
    width: 100%;
}

.video-container figcaption {
    padding: 1rem;
    background: var(--bg-color);
}

.video-container figcaption h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.video-container figcaption p {
    color: var(--text-light);
    font-size: 0.875rem;
}

.video-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.video-card {
    background: var(--bg-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.video-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.video-card figure {
    position: relative;
}

.video-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.video-card figcaption {
    padding: 1rem;
}

.video-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.video-card p {
    color: var(--text-light);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

.video-duration {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    background: var(--primary-color);
    color: var(--text-white);
    font-size: 0.75rem;
    border-radius: var(--radius-sm);
}

/* 栏目网格 */
.categories-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.category-card {
    display: block;
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.category-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.category-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.category-card:hover img {
    transform: scale(1.05);
}

.category-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 1.5rem 1rem;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
    color: var(--text-white);
}

.category-overlay h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.category-overlay p {
    font-size: 0.875rem;
    opacity: 0.9;
}

/* 相关推荐 */
.related-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
}

.related-grid li a {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background: var(--bg-light);
    border-radius: var(--radius-lg);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.related-grid li a:hover {
    background: var(--primary-color);
    color: var(--text-white);
}

/* 下载页面样式 */
.download-hero {
    padding: 4rem 1rem;
}

.app-preview {
    margin-top: 2rem;
}

.app-preview img {
    max-width: 300px;
    margin: 0 auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
}

.platform-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.platform-card {
    background: var(--bg-light);
    padding: 2rem;
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition-normal);
}

.platform-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.platform-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.version-info,
.system-req {
    color: var(--text-light);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

.download-btn {
    display: inline-block;
    margin: 1rem 0;
    padding: 0.875rem 2rem;
    background: var(--primary-color);
    color: var(--text-white);
    font-weight: 600;
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.download-btn:hover {
    background: var(--primary-dark);
    color: var(--text-white);
    transform: translateY(-2px);
}

.download-btn img {
    display: inline-block;
    height: 40px;
    width: auto;
}

.download-note {
    color: var(--text-light);
    font-size: 0.8125rem;
}

.install-steps {
    list-style: decimal;
    padding-left: 1.5rem;
    margin: 1rem 0 2rem;
}

.install-steps li {
    margin-bottom: 0.75rem;
    padding-left: 0.5rem;
}

.guide-content h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--primary-color);
    margin: 2rem 0 1rem;
}

.screenshots-gallery {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.screenshots-gallery figure {
    text-align: center;
}

.screenshots-gallery img {
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
}

.screenshots-gallery figcaption {
    margin-top: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-light);
}

.update-content h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-color);
    margin: 1.5rem 0 0.75rem;
}

.update-list {
    list-style: disc;
    padding-left: 1.5rem;
}

.update-list li {
    margin-bottom: 0.5rem;
    color: var(--text-light);
}

/* FAQ样式 */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 1.5rem;
    padding: 1.5rem;
    background: var(--bg-light);
    border-radius: var(--radius-lg);
}

.faq-item dt {
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.75rem;
}

.faq-item dd {
    color: var(--text-light);
    line-height: 1.7;
}

/* 团队介绍 */
.team-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

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

.team-member img {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    margin: 0 auto 1rem;
    object-fit: cover;
    box-shadow: var(--shadow-md);
}

.team-member h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

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

/* 统计数据 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    text-align: center;
}

.stat-item {
    padding: 1.5rem;
    background: var(--bg-light);
    border-radius: var(--radius-lg);
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1.2;
}

.stat-label {
    color: var(--text-light);
    font-size: 0.875rem;
    margin-top: 0.5rem;
}

/* ========================================
   页脚样式
   ======================================== */
.site-footer {
    background: var(--bg-dark);
    color: var(--text-white);
    padding: 3rem 1rem 1.5rem;
    margin-top: auto;
}

.footer-content {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

.footer-section h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-white);
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.footer-links a,
.legal-links a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.875rem;
    transition: color var(--transition-fast);
}

.footer-links a:hover,
.legal-links a:hover {
    color: var(--text-white);
}

.contact-info p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

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

.footer-bottom {
    max-width: var(--max-width);
    margin: 2rem auto 0;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.8125rem;
}

/* ========================================
   响应式设计 - 平板端
   ======================================== */
@media (min-width: 640px) {
    .site-title,
    .page-title {
        font-size: 2.25rem;
    }
    
    .site-tagline,
    .page-subtitle {
        font-size: 1.125rem;
    }
    
    .cta-buttons {
        flex-direction: row;
        justify-content: center;
    }
    
    .feature-grid,
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .video-list {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .platform-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .team-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .stats-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .footer-content {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* ========================================
   响应式设计 - 桌面端
   ======================================== */
@media (min-width: 1024px) {
    .mobile-menu-toggle {
        display: none;
    }
    
    .nav-menu {
        display: flex !important;
        position: static;
        background: transparent;
        padding: 0;
        box-shadow: none;
        gap: 0.25rem;
    }
    
    .nav-item {
        margin-bottom: 0;
    }
    
    .nav-item a {
        padding: 0.5rem 1rem;
        font-size: 0.9375rem;
    }
    
    .main-content {
        padding: 2rem;
    }
    
    .hero-section,
    .page-hero,
    .download-hero {
        margin: -2rem -2rem 3rem;
        padding: 5rem 2rem;
    }
    
    .site-title,
    .page-title {
        font-size: 3rem;
    }
    
    .site-tagline,
    .page-subtitle {
        font-size: 1.25rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .feature-grid,
    .features-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .video-showcase {
        margin: 0 -2rem;
        padding: 3rem 2rem;
    }
    
    .video-list {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .categories-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .category-card img {
        height: 250px;
    }
    
    .platform-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .screenshots-gallery {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* ========================================
   响应式设计 - 大屏幕
   ======================================== */
@media (min-width: 1280px) {
    .nav-container {
        padding: 0 2rem;
    }
    
    .main-content {
        max-width: var(--max-width);
        margin-left: auto;
        margin-right: auto;
        padding: 2rem 0;
        margin-top: calc(var(--header-height) + 1rem);
    }
    
    .hero-section,
    .page-hero,
    .download-hero {
        margin: -2rem 0 3rem;
        border-radius: var(--radius-xl);
    }
    
    .video-showcase {
        margin: 0;
        border-radius: var(--radius-xl);
    }
}

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

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

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

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

/* ========================================
   动画效果
   ======================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease forwards;
}

/* ========================================
   打印样式
   ======================================== */
@media print {
    .site-header,
    .site-footer,
    .mobile-menu-toggle,
    .cta-buttons,
    .download-btn {
        display: none !important;
    }
    
    .main-content {
        margin-top: 0;
    }
    
    body {
        font-size: 12pt;
        color: #000;
        background: #fff;
    }
    
    a {
        color: #000;
        text-decoration: underline;
    }
}