```css
/* ==========================================================================
   蘑菇视频 - 官网样式表
   主题：发现日常小确幸，短视频里的烟火气
   配色：暖橙 #F5A623 为主色调，搭配生活化暖色系
   ========================================================================== */

/* ==========================================================================
   1. 全局重置与基础样式
   ========================================================================== */

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Hiragino Sans GB', sans-serif;
    background-color: #ffffff;
    color: #1e1e1e;
    line-height: 1.75;
    font-size: 16px;
    transition: background-color 0.4s cubic-bezier(0.4, 0, 0.2, 1),
                color 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    overflow-x: hidden;
}

body.dark-mode {
    background-color: #0f0f0f;
    color: #e8e8e8;
}

a {
    color: #d48a1a;
    text-decoration: none;
    transition: color 0.25s ease, opacity 0.25s ease;
}

a:hover {
    color: #b06e0e;
    text-decoration: underline;
}

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

ul,
ol {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
}

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

/* ==========================================================================
   2. 导航吸顶 - 毛玻璃效果
   ========================================================================== */

.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.82);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    transition: background-color 0.4s ease, border-color 0.4s ease, box-shadow 0.3s ease;
}

.site-header:hover {
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.04);
}

body.dark-mode .site-header {
    background-color: rgba(15, 15, 15, 0.82);
    border-bottom-color: rgba(255, 255, 255, 0.08);
}

body.dark-mode .site-header:hover {
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 0;
    flex-wrap: wrap;
    gap: 10px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.5rem;
    font-weight: 700;
    color: #F5A623;
    letter-spacing: 0.5px;
    text-decoration: none;
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.logo:hover {
    text-decoration: none;
    transform: scale(1.03);
}

.logo svg {
    width: 36px;
    height: 36px;
    filter: drop-shadow(0 2px 6px rgba(245, 166, 35, 0.3));
    transition: filter 0.3s ease;
}

.logo:hover svg {
    filter: drop-shadow(0 4px 12px rgba(245, 166, 35, 0.5));
}

/* 导航菜单 */
.nav-menu {
    display: flex;
    list-style: none;
    gap: 24px;
    flex-wrap: wrap;
    align-items: center;
}

.nav-menu a {
    color: #1e1e1e;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 6px 0;
    border-bottom: 2px solid transparent;
    transition: border-color 0.25s ease, color 0.25s ease;
    position: relative;
}

body.dark-mode .nav-menu a {
    color: #e0e0e0;
}

.nav-menu a:hover {
    border-bottom-color: #F5A623;
    color: #F5A623;
    text-decoration: none;
}

/* 头部操作区 */
.header-actions {
    display: flex;
    align-items: center;
    gap: 14px;
}

/* 搜索框 - 毛玻璃效果 */
.search-box {
    display: flex;
    align-items: center;
    background: rgba(242, 242, 242, 0.8);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    border-radius: 40px;
    padding: 4px 6px 4px 16px;
    transition: background 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid rgba(0, 0, 0, 0.04);
}

.search-box:focus-within {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 0 0 3px rgba(245, 166, 35, 0.15);
}

body.dark-mode .search-box {
    background: rgba(42, 42, 42, 0.8);
    border-color: rgba(255, 255, 255, 0.06);
}

body.dark-mode .search-box:focus-within {
    background: rgba(50, 50, 50, 0.95);
    box-shadow: 0 0 0 3px rgba(245, 166, 35, 0.2);
}

.search-box input {
    border: none;
    background: transparent;
    padding: 8px 0;
    font-size: 0.9rem;
    outline: none;
    width: 140px;
    color: inherit;
    font-family: inherit;
}

.search-box input::placeholder {
    color: #888;
    transition: color 0.3s ease;
}

body.dark-mode .search-box input::placeholder {
    color: #777;
}

.search-box button {
    background: linear-gradient(135deg, #F5A623 0%, #F7C948 100%);
    border: none;
    border-radius: 40px;
    padding: 6px 14px;
    cursor: pointer;
    color: #fff;
    font-weight: 600;
    font-size: 0.85rem;
    transition: background 0.25s ease, transform 0.2s ease, box-shadow 0.25s ease;
    font-family: inherit;
}

.search-box button:hover {
    background: linear-gradient(135deg, #d48a1a 0%, #e0b030 100%);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(245, 166, 35, 0.35);
}

.search-box button:active {
    transform: translateY(0);
}

/* 主题切换 & 移动菜单按钮 */
.theme-toggle,
.mobile-toggle {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.3rem;
    padding: 6px;
    border-radius: 50%;
    transition: background 0.25s ease, transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    color: inherit;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover,
.mobile-toggle:hover {
    background: rgba(0, 0, 0, 0.06);
    transform: rotate(15deg);
}

body.dark-mode .theme-toggle:hover,
body.dark-mode .mobile-toggle:hover {
    background: rgba(255, 255, 255, 0.08);
}

.mobile-toggle {
    display: none;
}

/* ==========================================================================
   3. 面包屑导航
   ========================================================================== */

.breadcrumb {
    padding: 16px 0;
    font-size: 0.9rem;
    color: #666;
}

body.dark-mode .breadcrumb {
    color: #aaa;
}

.breadcrumb ol {
    display: flex;
    flex-wrap: wrap;
    list-style: none;
    gap: 6px;
}

.breadcrumb li + li::before {
    content: "›";
    margin-right: 6px;
    color: #999;
}

.breadcrumb a {
    color: #666;
    transition: color 0.2s ease;
}

body.dark-mode .breadcrumb a {
    color: #aaa;
}

.breadcrumb a:hover {
    color: #F5A623;
}

/* ==========================================================================
   4. 首屏 Banner - 渐变背景 + 圆角 + 动画
   ========================================================================== */

.banner {
    position: relative;
    width: 100%;
    min-height: 420px;
    background: linear-gradient(135deg, #F5A623 0%, #F7C948 40%, #FFD97D 100%);
    border-radius: 28px;
    margin: 20px 0 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 48px 24px;
    box-shadow: 0 12px 40px rgba(245, 166, 35, 0.25);
    transition: box-shadow 0.4s ease;
}

.banner::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 40%, rgba(255, 255, 255, 0.15) 0%, transparent 50%),
                radial-gradient(circle at 70% 60%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
    animation: bannerShimmer 12s ease-in-out infinite;
    pointer-events: none;
}

@keyframes bannerShimmer {
    0%, 100% {
        transform: translate(0, 0) rotate(0deg);
    }
    33% {
        transform: translate(2%, -2%) rotate(1deg);
    }
    66% {
        transform: translate(-1%, 1%) rotate(-1deg);
    }
}

.banner:hover {
    box-shadow: 0 16px 56px rgba(245, 166, 35, 0.35);
}

.banner-content {
    max-width: 800px;
    text-align: center;
    color: #fff;
    position: relative;
    z-index: 2;
}

.banner-content h1 {
    font-size: 2.8rem;
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 16px;
    text-shadow: 0 2px 16px rgba(0, 0, 0, 0.12);
    letter-spacing: -0.5px;
}

.banner-content p {
    font-size: 1.15rem;
    opacity: 0.95;
    margin-bottom: 28px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.7;
}

.banner-cta {
    display: inline-block;
    background: #fff;
    color: #F5A623;
    padding: 14px 36px;
    border-radius: 50px;
    font-weight: 700;
    font-size: 1.05rem;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1),
                box-shadow 0.3s ease,
                color 0.25s ease;
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.banner-cta::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(245, 166, 35, 0.08);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.5s ease, height 0.5s ease;
}

.banner-cta:hover::after {
    width: 300px;
    height: 300px;
}

.banner-cta:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 14px 36px rgba(0, 0, 0, 0.18);
    text-decoration: none;
    color: #d48a1a;
}

.banner-cta:active {
    transform: translateY(-1px) scale(0.99);
}

/* Banner 轮播 */
.banner-slide {
    display: none;
    width: 100%;
    text-align: center;
    animation: slideFadeIn 0.6s ease forwards;
}

.banner-slide.active {
    display: block;
}

@keyframes slideFadeIn {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ==========================================================================
   5. 区块通用样式
   ========================================================================== */

section {
    margin: 72px 0;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: #1e1e1e;
    letter-spacing: -0.5px;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 48px;
    height: 4px;
    background: linear-gradient(90deg, #F5A623, #F7C948);
    border-radius: 2px;
}

body.dark-mode .section-title {
    color: #f0f0f0;
}

.section-subtitle {
    font-size: 1.05rem;
    color: #666;
    margin-bottom: 36px;
    max-width: 720px;
    line-height: 1.75;
    margin-top: 12px;
}

body.dark-mode .section-subtitle {
    color: #aaa;
}

/* ==========================================================================
   6. 卡片网格 - 圆角 + hover 动画
   ========================================================================== */

.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 24px;
}

.card {
    background: linear-gradient(145deg, #f9f9f9 0%, #f4f4f4 100%);
    border-radius: 18px;
    padding: 28px 24px;
    transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1),
                box-shadow 0.35s ease,
                border-color 0.3s ease;
    border: 1px solid rgba(0, 0, 0, 0.04);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, #F5A623, #F7C948, #FFD97D);
    opacity: 0;
    transition: opacity 0.35s ease;
}

.card:hover::before {
    opacity: 1;
}

body.dark-mode .card {
    background: linear-gradient(145deg, #1e1e1e 0%, #1a1a1a 100%);
    border-color: rgba(255, 255, 255, 0.06);
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.08);
}

body.dark-mode .card:hover {
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.45);
}

.card h3 {
    font-size: 1.25rem;
    margin-bottom: 10px;
    font-weight: 600;
    color: #1e1e1e;
    transition: color 0.3s ease;
}

body.dark-mode .card h3 {
    color: #f0f0f0;
}

.card:hover h3 {
    color: #F5A623;
}

.card p {
    color: #555;
    font-size: 0.95rem;
    line-height: 1.75;
}

body.dark-mode .card p {
    color: #b0b0b0;
}

.card ul {
    list-style: none;
}

.card ul li {
    margin-bottom: 8px;
    font-size: 0.95rem;
}

.card ul li a {
    color: #555;
    transition: color 0.2s ease, padding-left 0.25s ease;
    display: inline-block;
}

body.dark-mode .card ul li a {
    color: #b0b0b0;
}

.card ul li a:hover {
    color: #F5A623;
    padding-left: 4px;
    text-decoration: none;
}

/* ==========================================================================
   7. 数字统计动画
   ========================================================================== */

.stats-row {
    display: flex;
    flex-wrap: wrap;
    gap: 32px;
    justify-content: space-around;
    margin: 48px 0;
    text-align: center;
    padding: 32px 0;
    background: linear-gradient(135deg, rgba(245, 166, 35, 0.04) 0%, rgba(247, 201, 72, 0.06) 100%);
    border-radius: 20px;
}

body.dark-mode .stats-row {
    background: linear-gradient(135deg, rgba(245, 166, 35, 0.06) 0%, rgba(247, 201, 72, 0.04) 100%);
}

.stat-item {
    flex: 1 1 150px;
}

.stat-number {
    font-size: 2.6rem;
    font-weight: 800;
    color: #F5A623;
    line-height: 1.2;
    letter-spacing: -1px;
    transition: transform 0.3s ease;
}

.stat-item:hover .stat-number {
    transform: scale(1.08);
}

.stat-label {
    font-size: 0.95rem;
    color: #666;
    margin-top: 4px;
}

body.dark-mode .stat-label {
    color: #aaa;
}

/* ==========================================================================
   8. 文章列表 - 圆角卡片 + hover 动画
   ========================================================================== */

.article-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.article-item {
    background: #fff;
    border-radius: 18px;
    padding: 24px;
    border: 1px solid rgba(0, 0, 0, 0.06);
    transition: box-shadow 0.35s ease,
                transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1),
                border-color 0.3s ease;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.article-item::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, #F5A623, #F7C948);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.article-item:hover::after {
    transform: scaleX(1);
}

body.dark-mode .article-item {
    background: #1a1a1a;
    border-color: rgba(255, 255, 255, 0.06);
}

.article-item:hover {
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.08);
    transform: translateY(-4px);
    border-color: rgba(245, 166, 35, 0.2);
}

body.dark-mode .article-item:hover {
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.5);
    border-color: rgba(245, 166, 35, 0.15);
}

.article-item h3 {
    font-size: 1.15rem;
    margin-bottom: 8px;
    font-weight: 600;
    line-height: 1.4;
    color: #1e1e1e;
    transition: color 0.3s ease;
}

body.dark-mode .article-item h3 {
    color: #f0f0f0;
}

.article-item:hover h3 {
    color: #F5A623;
}

.article-meta {
    font-size: 0.8rem;
    color: #888;
    margin-bottom: 10px;
}

.article-summary {
    color: #555;
    font-size: 0.92rem;
    flex: 1;
    line-height: 1.7;
}

body.dark-mode .article-summary {
    color: #b0b0b0;
}

.read-more {
    display: inline-block;
    margin-top: 14px;
    font-weight: 600;
    font-size: 0.9rem;
    color: #F5A623;
    transition: color 0.2s ease, transform 0.25s ease;
}

.read-more:hover {
    text-decoration: underline;
    color: #d48a1a;
    transform: translateX(4px);
}

/* ==========================================================================
   9. FAQ 手风琴
   ========================================================================== */

.faq-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.faq-item {
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 14px;
    overflow: hidden;
    background: #fff;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.faq-item:hover {
    border-color: rgba(245, 166, 35, 0.3);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
}

body.dark-mode .faq-item {
    background: #1e1e1e;
    border-color: rgba(255, 255, 255, 0.08);
}

body.dark-mode .faq-item:hover {
    border-color: rgba(245, 166, 35, 0.25);
}

.faq-question {
    padding: 18px 20px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: #fafafa;
    transition: background 0.25s ease, color 0.25s ease;
    font-size: 1rem;
    color: #1e1e1e;
    user-select: none;
}

body.dark-mode .faq-question {
    background: #252525;
    color: #e0e0e0;
}

.faq-question:hover {
    background: #f0f0f0;
    color: #F5A623;
}

body.dark-mode .faq-question:hover {
    background: #2e2e2e;
    color: #F5A623;
}

.faq-question::after {
    content: "＋";
    font-size: 1.2rem;
    color: #F5A623;
    transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
    flex-shrink: 0;
    margin-left: 12px;
}

.faq-item.open .faq-question::after {
    content: "－";
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.45s cubic-bezier(0.4, 0, 0.2, 1),
                padding 0.35s ease,
                opacity 0.35s ease;
    padding: 0 20px;
    background: #fff;
    opacity: 0;
}

body.dark-mode .faq-answer {
    background: #1e1e1e;
}

.faq-item.open .faq-answer {
    max-height: 500px;
    padding: 16px 20px 20px;
    opacity: 1;
}

.faq-answer p {
    color: #555;
    font-size: 0.95rem;
    line-height: 1.8;
}

body.dark-mode .faq-answer p {
    color: #b0b0b0;
}

/* ==========================================================================
   10. 返回顶部按钮
   ========================================================================== */

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: linear-gradient(135deg, #F5A623 0%, #F7C948 100%);
    color: #fff;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    cursor: pointer;
    box-shadow: 0 4px 20px rgba(245, 166, 35, 0.4);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.35s ease,
                transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1),
                box-shadow 0.3s ease;
    border: none;
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    pointer-events: auto;
}

.back-to-top:hover {
    transform: translateY(-4px) scale(1.05);
    background: linear-gradient(135deg, #d48a1a 0%, #e0b030 100%);
    box-shadow: 0 8px 28px rgba(245, 166, 35, 0.5);
}

.back-to-top:active {
    transform: translateY(-1px) scale(0.98);
}

/* ==========================================================================
   11. 页脚
   ========================================================================== */

.site-footer {
    background: linear-gradient(180deg, #f8f8f8 0%, #f0f0f0 100%);
    padding: 56px 0 28px;
    margin-top: 88px;
    border-top: 1px solid rgba(0, 0, 0, 0.06);
}

body.dark-mode .site-footer {
    background: linear-gradient(180deg, #0e0e0e 0%, #0a0a0a 100%);
    border-top-color: rgba(255, 255, 255, 0.06);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 36px;
    margin-bottom: 40px;
}

.footer-col h4 {
    font-size: 1rem;
    margin-bottom: 16px;
    font-weight: 700;
    color: #1e1e1e;
    position: relative;
    padding-bottom: 8px;
}

.footer-col h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 24px;
    height: 2px;
    background: linear-gradient(90deg, #F5A623, #F7C948);
    border-radius: 1px;
}

body.dark-mode .footer-col h4 {
    color: #e0e0e0;
}

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

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

.footer-col a {
    color: #555;
    font-size: 0.9rem;
    transition: color 0.2s ease, padding-left 0.25s ease;
    display: inline-block;
}

body.dark-mode .footer-col a {
    color: #aaa;
}

.footer-col a:hover {
    color: #F5A623;
    padding-left: 4px;
    text-decoration: none;
}

.footer-col li:not(:has(a)) {
    color: #555;
    font-size: 0.9rem;
}

body.dark-mode .footer-col li:not(:has(a)) {
    color: #aaa;
}

.footer-bottom {
    border-top: 1px solid rgba(0, 0, 0, 0.06);
    padding-top: 22px;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: #777;
    gap: 12px;
}

body.dark-mode .footer-bottom {
    border-top-color: rgba(255, 255, 255, 0.06);
    color: #999;
}

.footer-bottom a {
    color: #777;
    transition: color 0.2s ease;
}

body.dark-mode .footer-bottom a {
    color: #999;
}

.footer-bottom a:hover {
    color: #F5A623;
}

/* ==========================================================================
   12. 滚动动画
   ========================================================================== */

.fade-in {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1),
                transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: opacity, transform;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 逐项延迟动画 */
.fade-in.visible .card:nth-child(1) { transition-delay: 0.05s; }
.fade-in.visible .card:nth-child(2) { transition-delay: 0.1s; }
.fade-in.visible .card:nth-child(3) { transition-delay: 0.15s; }
.fade-in.visible .card:nth-child(4) { transition-delay: 0.2s; }
.fade-in.visible .card:nth-child(5) { transition-delay: 0.25s; }
.fade-in.visible .card:nth-child(6) { transition-delay: 0.3s; }

/* ==========================================================================
   13. 响应式布局 - 平板
   ========================================================================== */

@media (max-width: 1024px) {
    .banner-content h1 {
        font-size: 2.4rem;
    }

    .section-title {
        font-size: 1.8rem;
    }

    .grid-2 {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    }
}

/* ==========================================================================
   14. 响应式布局 - 手机
   ========================================================================== */

@media (max-width: 768px) {
    .header-inner {
        flex-wrap: wrap;
        padding: 8px 0;
    }

    .nav-menu {
        display: none;
        width: 100%;
        flex-direction: column;
        align-items: flex-start;
        padding: 16px 0;
        gap: 12px;
        border-top: 1px solid rgba(0, 0, 0, 0.06);
        margin-top: 8px;
    }

    body.dark-mode .nav-menu {
        border-top-color: rgba(255, 255, 255, 0.06);
    }

    .nav-menu.open {
        display: flex;
        animation: menuSlideDown 0.35s ease forwards;
    }

    @keyframes menuSlideDown {
        from {
            opacity: 0;
            transform: translateY(-8px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }

    .mobile-toggle {
        display: flex;
    }

    .search-box input {
        width: 100px;
    }

    .banner {
        min-height: 360px;
        padding: 40px 20px;
        border-radius: 22px;
        margin: 16px 0 36px;
    }

    .banner-content h1 {
        font-size: 1.9rem;
    }

    .banner-content p {
        font-size: 1rem;
    }

    .banner-cta {
        padding: 12px 28px;
        font-size: 0.95rem;
    }

    section {
        margin: 56px 0;
    }

    .section-title {
        font-size: 1.6rem;
    }

    .section-subtitle {
        font-size: 0.95rem;
        margin-bottom: 28px;
    }

    .grid-3 {
        grid-template-columns: 1fr;
        gap: 18px;
    }

    .grid-2 {
        grid-template-columns: 1fr;
        gap: 18px;
    }

    .card {
        padding: 22px 20px;
        border-radius: 16px;
    }

    .stat-number {
        font-size: 2rem;
    }

    .stats-row {
        gap: 20px;
        padding: 24px 16px;
        border-radius: 16px;
    }

    .article-list {
        grid-template-columns: 1fr;
        gap: 18px;
    }

    .article-item {
        padding: 20px;
        border-radius: 16px;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 28px;
    }

    .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 42px;
        height: 42px;
        font-size: 1.2rem;
    }

    .faq-question {
        padding: 16px 18px;
        font-size: 0.95rem;
    }

    .faq-item.open .faq-answer {
        padding: 14px 18px 18px;
    }
}

/* ==========================================================================
   15. 响应式布局 - 小屏手机
   ========================================================================== */

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

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .banner {
        min-height: 320px;
        padding: 32px 16px;
        border-radius: 18px;
    }

    .banner-content h1 {
        font-size: 1.6rem;
        margin-bottom: 12px;
    }

    .banner-content p {
        font-size: 0.9rem;
        margin-bottom: 20px;
    }

    .banner-cta {
        padding: 10px 24px;
        font-size: 0.9rem;
    }

    .header-actions {
        gap: 8px;
    }

    .search-box {
        padding: 2px 4px 2px 12px;
    }

    .search-box input {
        width: 80px;
        font-size: 0.8rem;
    }

    .search-box button {
        padding: 5px 10px;
        font-size: 0.75rem;
    }

    .logo {
        font-size: 1.2rem;
    }

    .logo svg {
        width: 30px;
        height: 30px;
    }

    .section-title {
        font-size: 1.4rem;
    }

    .section-title::after {
        width: 36px;
        height: 3px;
    }

    .stat-number {
        font-size: 1.8rem;
    }

    .stat-label {
        font-size: 0.85rem;
    }

    .card h3 {
        font-size: 1.1rem;
    }

    .card p {
        font-size: 0.9rem;
    }

    .article-item h3 {
        font-size: 1.05rem;
    }

    .article-summary {
        font-size: 0.88rem;
    }

    .faq-question {
        padding: 14px 16px;
        font-size: 0.9rem;
    }

    .faq-answer p {
        font-size: 0.88rem;
    }

    .footer-col h4 {
        font-size: 0.95rem;
    }

    .footer-col a {
        font-size: 0.85rem;
    }

    .footer-bottom {
        font-size: 0.78rem;
    }
}

/* ==========================================================================
   16. 减少动画偏好支持
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    .fade-in {
        opacity: 1;
        transform: none;
    }
}

/* ==========================================================================
   17. 打印样式
   ========================================================================== */

@media print {
    .site-header,
    .back-to-top,
    .search-box,
    .theme-toggle,
    .mobile-toggle,
    .banner-cta {
        display: none !important;
    }

    body {
        background: #fff !important;
        color: #000 !important;
    }

    .banner {
        background: #f5f5f5 !important;
        box-shadow: none !important;
    }

    .card,
    .article-item,
    .faq-item {
        box-shadow: none !important;
        border: 1px solid #ddd !important;
    }
}

/* ==========================================================================
   18. 选择文本样式
   ========================================================================== */

::selection {
    background: rgba(245, 166, 35, 0.25);
    color: #1e1e1e;
}

body.dark-mode ::selection {
    background: rgba(245, 166, 35, 0.35);
    color: #fff;
}

/* ==========================================================================
   19. 滚动条美化
   ========================================================================== */

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(245, 166, 35, 0.3);
    border-radius: 4px;
    transition: background 0.3s ease;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(245, 166, 35, 0.5);
}

body.dark-mode ::-webkit-scrollbar-thumb {
    background: rgba(245, 166, 35, 0.25);
}

body.dark-mode ::-webkit-scrollbar-thumb:hover {
    background: rgba(245, 166, 35, 0.45);
}

/* Firefox 滚动条 */
* {
    scrollbar-width: thin;
    scrollbar-color: rgba(245, 166, 35, 0.3) transparent;
}

body.dark-mode * {
    scrollbar-color: rgba(245, 166, 35, 0.25) transparent;
}

/* ==========================================================================
   20. 焦点可见样式（无障碍）
   ========================================================================== */

:focus-visible {
    outline: 2px solid #F5A623;
    outline-offset: 2px;
    border-radius: 4px;
}

button:focus-visible,
a:focus-visible {
    outline: 2px solid #F5A623;
    outline-offset: 2px;
}

/* ==========================================================================
   21. 图片懒加载占位
   ========================================================================== */

img[loading="lazy"] {
    background: linear-gradient(135deg, #f0f0f0 0%, #e8e8e8 100%);
    border-radius: 8px;
    min-height: 100px;
}

body.dark-mode img[loading="lazy"] {
    background: linear-gradient(135deg, #1e1e1e 0%, #252525 100%);
}

/* ==========================================================================
   22. 工具类
   ========================================================================== */

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

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

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mt-16 { margin-top: 16px; }
.mb-16 { margin-bottom: 16px; }
.mt-24 { margin-top: 24px; }
.mb-24 { margin-bottom: 24px; }

/* ==========================================================================
   23. 高对比度模式支持
   ========================================================================== */

@media (prefers-contrast: high) {
    .card,
    .article-item,
    .faq-item {
        border-width: 2px;
    }

    .section-title::after {
        height: 5px;
    }

    .banner-cta {
        border: 2px solid #1e1e1e;
    }
}

/* ==========================================================================
   24. 横屏手机适配
   ========================================================================== */

@media (max-height: 500px) and (orientation: landscape) {
    .banner {
        min-height: 280px;
        padding: 24px 20px;
    }

    .banner-content h1 {
        font-size: 1.6rem;
    }

    .banner-content p {
        font-size: 0.9rem;
        margin-bottom: 16px;
    }

    section {
        margin: 40px 0;
    }
}

/* ==========================================================================
   25. 深色模式图片处理
   ========================================================================== */

body.dark-mode img:not([src*=".svg"]) {
    filter: brightness(0.9) contrast(1.05);
}

body.dark-mode .logo svg {
    filter: drop-shadow(0 2px 8px rgba(245, 166, 35, 0.4));
}

/* ==========================================================================
   26. 骨架屏加载动画（预留）
   ========================================================================== */

@keyframes skeletonPulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: skeletonPulse 1.5s ease-in-out infinite;
    border-radius: 8px;
}

body.dark-mode .skeleton {
    background: linear-gradient(90deg, #1e1e1e 25%, #2a2a2a 50%, #1e1e1e 75%);
    background-size: 200% 100%;
}

/* ==========================================================================
   27. 平滑过渡优化
   ========================================================================== */

.site-header,
.card,
.article-item,
.faq-item,
.banner,
.back-to-top,
.search-box,
.banner-cta,
.read-more,
.stat-number {
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    transform: translateZ(0);
    -webkit-transform: translateZ(0);
}

/* ==========================================================================
   28. 移动端点击高亮移除
   ========================================================================== */

* {
    -webkit-tap-highlight-color: transparent;
}

/* ==========================================================================
   29. 表单元素继承字体
   ========================================================================== */

input,
textarea,
select,
button {
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
}

/* ==========================================================================
   30. 内容区域最大宽度限制
   ========================================================================== */

.banner-content,
.section-subtitle,
.faq-answer p,
.article-summary {
    max-width: 100%;
    overflow-wrap: break-word;
    word-wrap: break-word;
    word-break: break-word;
}
```