/* =============================================
   海角视频 - 主样式文件
   设计风格：现代影视传媒 · 玫瑰粉+深夜黑+金色点缀
   字体：思源黑体 + Noto Serif SC
   布局：非对称网格 + 卡片流
   ============================================= */

/* ---- 基础重置 ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: #0d0d12;
    color: #e8e0f0;
    line-height: 1.7;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; transition: color .2s; }
a:hover { color: #f06292; }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

/* ---- CSS变量 ---- */
:root {
    --rose: #f06292;
    --rose-dark: #c2185b;
    --rose-light: #fce4ec;
    --gold: #ffd54f;
    --bg-dark: #0d0d12;
    --bg-card: #18181f;
    --bg-card2: #1e1e2a;
    --border: rgba(240,98,146,.18);
    --text-main: #e8e0f0;
    --text-muted: #9e8fa8;
    --radius: 12px;
    --shadow: 0 4px 32px rgba(240,98,146,.12);
    --transition: .25s cubic-bezier(.23,1,.32,1);
}

/* ---- 顶部公告条 ---- */
.top-bar {
    background: linear-gradient(90deg, #c2185b 0%, #f06292 50%, #c2185b 100%);
    color: #fff;
    text-align: center;
    font-size: .82rem;
    padding: 6px 16px;
    letter-spacing: .04em;
}

/* ---- 导航栏 ---- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 999;
    background: rgba(13,13,18,.96);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 2px 24px rgba(0,0,0,.4);
}
.header-inner {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    gap: 24px;
    height: 64px;
}
.site-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}
.site-logo img {
    height: 38px;
    width: auto;
}
.site-logo .brand-name {
    font-size: 1.25rem;
    font-weight: 700;
    background: linear-gradient(135deg, #f06292, #ffd54f);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: .05em;
}
.main-nav {
    display: flex;
    align-items: center;
    gap: 4px;
    flex: 1;
}
.main-nav a {
    padding: 6px 14px;
    border-radius: 8px;
    font-size: .92rem;
    font-weight: 500;
    color: var(--text-main);
    transition: background var(--transition), color var(--transition);
    white-space: nowrap;
}
.main-nav a:hover,
.main-nav a.active {
    background: rgba(240,98,146,.15);
    color: var(--rose);
}
.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}
.btn-login {
    padding: 7px 20px;
    border-radius: 20px;
    background: linear-gradient(135deg, #f06292, #c2185b);
    color: #fff !important;
    font-size: .88rem;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: opacity var(--transition), transform var(--transition);
}
.btn-login:hover { opacity: .88; transform: scale(.97); }

/* ---- 搜索框 ---- */
.search-bar-wrap {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    padding: 10px 24px;
}
.search-bar-inner {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 12px;
}
.search-bar-inner form {
    display: flex;
    flex: 1;
    max-width: 560px;
    background: var(--bg-card2);
    border: 1px solid var(--border);
    border-radius: 24px;
    overflow: hidden;
    transition: border-color var(--transition);
}
.search-bar-inner form:focus-within {
    border-color: var(--rose);
    box-shadow: 0 0 0 3px rgba(240,98,146,.12);
}
.search-bar-inner input[type="text"] {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    padding: 9px 18px;
    color: var(--text-main);
    font-size: .92rem;
}
.search-bar-inner input::placeholder { color: var(--text-muted); }
.search-bar-inner button[type="submit"] {
    padding: 9px 22px;
    background: linear-gradient(135deg, #f06292, #c2185b);
    color: #fff;
    border: none;
    cursor: pointer;
    font-size: .9rem;
    font-weight: 600;
    transition: opacity var(--transition);
}
.search-bar-inner button:hover { opacity: .85; }
.search-hot-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    font-size: .8rem;
    color: var(--text-muted);
}
.search-hot-tags span { color: var(--rose); margin-right: 4px; }
.search-hot-tags a {
    padding: 3px 10px;
    border-radius: 12px;
    background: rgba(240,98,146,.1);
    color: var(--text-muted);
    transition: background var(--transition), color var(--transition);
}
.search-hot-tags a:hover { background: rgba(240,98,146,.25); color: var(--rose); }

/* ---- 面包屑 ---- */
.breadcrumb {
    max-width: 1280px;
    margin: 0 auto;
    padding: 10px 24px;
    font-size: .82rem;
    color: var(--text-muted);
    display: flex;
    gap: 6px;
    align-items: center;
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--rose); }
.breadcrumb .sep { opacity: .4; }

/* ---- 主容器 ---- */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}
.section { padding: 56px 0; }
.section-sm { padding: 32px 0; }

/* ---- 区块标题 ---- */
.section-title {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 32px;
}
.section-title h2 {
    font-size: 1.55rem;
    font-weight: 800;
    color: #fff;
    letter-spacing: .02em;
}
.section-title .title-badge {
    padding: 3px 12px;
    border-radius: 20px;
    background: linear-gradient(135deg, #f06292, #c2185b);
    color: #fff;
    font-size: .75rem;
    font-weight: 700;
    letter-spacing: .06em;
}
.section-title .title-line {
    flex: 1;
    height: 2px;
    background: linear-gradient(90deg, var(--border), transparent);
    border-radius: 2px;
}
.section-title a.more-link {
    font-size: .82rem;
    color: var(--rose);
    white-space: nowrap;
}

/* ---- Hero 横幅 ---- */
.hero-section {
    position: relative;
    overflow: hidden;
    min-height: 480px;
    display: flex;
    align-items: center;
}
.hero-bg {
    position: absolute;
    inset: 0;
    background-image: url('../images/hero_banner.jpg');
    background-size: cover;
    background-position: center top;
    filter: brightness(.55);
    transform: scale(1.04);
    transition: transform 8s ease;
}
.hero-section:hover .hero-bg { transform: scale(1.0); }
.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(13,13,18,.85) 0%, rgba(194,24,91,.18) 100%);
}
.hero-content {
    position: relative;
    z-index: 2;
    max-width: 1280px;
    margin: 0 auto;
    padding: 80px 24px;
}
.hero-content h1 {
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 900;
    color: #fff;
    line-height: 1.2;
    margin-bottom: 16px;
    text-shadow: 0 2px 24px rgba(0,0,0,.5);
}
.hero-content h1 em {
    font-style: normal;
    background: linear-gradient(135deg, #f06292, #ffd54f);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-content p {
    font-size: 1.08rem;
    color: rgba(255,255,255,.82);
    max-width: 560px;
    margin-bottom: 28px;
    line-height: 1.8;
}
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; }
.btn-primary {
    padding: 12px 32px;
    border-radius: 28px;
    background: linear-gradient(135deg, #f06292, #c2185b);
    color: #fff;
    font-size: 1rem;
    font-weight: 700;
    border: none;
    cursor: pointer;
    transition: transform var(--transition), box-shadow var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 32px rgba(240,98,146,.4); color: #fff; }
.btn-outline {
    padding: 12px 32px;
    border-radius: 28px;
    background: transparent;
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    border: 2px solid rgba(255,255,255,.5);
    cursor: pointer;
    transition: border-color var(--transition), background var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
.btn-outline:hover { border-color: var(--rose); background: rgba(240,98,146,.1); color: #fff; }
.hero-stats {
    display: flex;
    gap: 32px;
    margin-top: 40px;
    flex-wrap: wrap;
}
.hero-stat { text-align: center; }
.hero-stat .num {
    font-size: 1.8rem;
    font-weight: 900;
    color: var(--gold);
    display: block;
}
.hero-stat .label { font-size: .78rem; color: rgba(255,255,255,.6); }

/* ---- 视频卡片网格 ---- */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 20px;
}
.video-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    cursor: pointer;
}
.video-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow);
    border-color: rgba(240,98,146,.4);
}
.video-thumb {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16/10;
    background: #111;
}
.video-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .4s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.06); }
.play-btn-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0,0,0,.35);
    opacity: 0;
    transition: opacity var(--transition);
}
.video-card:hover .play-btn-overlay { opacity: 1; }
.play-btn-overlay .play-icon {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: rgba(240,98,146,.9);
    display: flex;
    align-items: center;
    justify-content: center;
    transform: scale(.85);
    transition: transform var(--transition);
    box-shadow: 0 4px 24px rgba(240,98,146,.5);
}
.video-card:hover .play-icon { transform: scale(1); }
.play-icon svg { width: 22px; height: 22px; fill: #fff; margin-left: 3px; }
.video-duration {
    position: absolute;
    bottom: 8px;
    right: 10px;
    background: rgba(0,0,0,.72);
    color: #fff;
    font-size: .72rem;
    padding: 2px 7px;
    border-radius: 4px;
}
.video-tag {
    position: absolute;
    top: 8px;
    left: 8px;
    background: linear-gradient(135deg, #f06292, #c2185b);
    color: #fff;
    font-size: .7rem;
    padding: 2px 9px;
    border-radius: 4px;
    font-weight: 700;
}
.video-info { padding: 14px 14px 16px; }
.video-info h3 {
    font-size: .95rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 8px;
    line-height: 1.45;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.video-meta {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: .78rem;
    color: var(--text-muted);
}
.video-meta .author {
    display: flex;
    align-items: center;
    gap: 5px;
}
.video-meta .author img {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    object-fit: cover;
}
.video-stats {
    display: flex;
    gap: 12px;
    margin-top: 8px;
    font-size: .76rem;
    color: var(--text-muted);
}
.video-stats span { display: flex; align-items: center; gap: 4px; }

/* ---- 特色大卡片 ---- */
.featured-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}
.featured-card {
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
    min-height: 260px;
    cursor: pointer;
    transition: transform var(--transition);
}
.featured-card:hover { transform: scale(1.01); }
.featured-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    position: absolute;
    inset: 0;
    filter: brightness(.6);
    transition: filter var(--transition);
}
.featured-card:hover img { filter: brightness(.5); }
.featured-card-content {
    position: relative;
    z-index: 2;
    padding: 24px;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
}
.featured-card-content h3 {
    font-size: 1.2rem;
    font-weight: 800;
    color: #fff;
    margin-bottom: 8px;
}
.featured-card-content p { font-size: .85rem; color: rgba(255,255,255,.75); }
.featured-card .play-btn-overlay { opacity: 1; background: transparent; }
.featured-card:hover .play-icon { transform: scale(1.1); }

/* ---- 分类标签栏 ---- */
.category-tabs {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 28px;
}
.tab-btn {
    padding: 7px 20px;
    border-radius: 20px;
    background: var(--bg-card2);
    color: var(--text-muted);
    font-size: .88rem;
    border: 1px solid var(--border);
    cursor: pointer;
    transition: all var(--transition);
}
.tab-btn:hover, .tab-btn.active {
    background: linear-gradient(135deg, #f06292, #c2185b);
    color: #fff;
    border-color: transparent;
}

/* ---- 专家卡片 ---- */
.expert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
}
.expert-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 24px 16px;
    text-align: center;
    border: 1px solid var(--border);
    transition: transform var(--transition), box-shadow var(--transition);
}
.expert-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.expert-avatar {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    object-fit: cover;
    margin: 0 auto 12px;
    border: 3px solid var(--rose);
}
.expert-card h4 { font-size: 1rem; font-weight: 700; color: #fff; margin-bottom: 4px; }
.expert-card .role { font-size: .8rem; color: var(--rose); margin-bottom: 8px; }
.expert-card .desc { font-size: .78rem; color: var(--text-muted); line-height: 1.6; margin-bottom: 12px; }
.expert-card .awards { font-size: .75rem; color: var(--gold); margin-bottom: 12px; }
.expert-btns { display: flex; gap: 8px; justify-content: center; }
.btn-sm {
    padding: 5px 14px;
    border-radius: 14px;
    font-size: .78rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: opacity var(--transition);
}
.btn-sm:hover { opacity: .82; }
.btn-rose { background: var(--rose); color: #fff; }
.btn-ghost { background: var(--bg-card2); color: var(--text-muted); border: 1px solid var(--border); }

/* ---- AI赋能模块 ---- */
.ai-features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.ai-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 28px 22px;
    border: 1px solid var(--border);
    transition: transform var(--transition), border-color var(--transition);
    position: relative;
    overflow: hidden;
}
.ai-card::before {
    content: '';
    position: absolute;
    top: -40px;
    right: -40px;
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(240,98,146,.15), transparent 70%);
}
.ai-card:hover { transform: translateY(-4px); border-color: rgba(240,98,146,.35); }
.ai-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: linear-gradient(135deg, rgba(240,98,146,.2), rgba(194,24,91,.1));
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
    font-size: 1.5rem;
}
.ai-card h4 { font-size: 1.05rem; font-weight: 700; color: #fff; margin-bottom: 8px; }
.ai-card p { font-size: .85rem; color: var(--text-muted); line-height: 1.7; }

/* ---- 社区功能 ---- */
.community-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}
.community-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 22px 16px;
    text-align: center;
    border: 1px solid var(--border);
    transition: transform var(--transition), border-color var(--transition);
    cursor: pointer;
}
.community-card:hover { transform: translateY(-3px); border-color: rgba(240,98,146,.35); }
.community-icon { font-size: 2rem; margin-bottom: 10px; }
.community-card h4 { font-size: .95rem; font-weight: 700; color: #fff; margin-bottom: 6px; }
.community-card p { font-size: .78rem; color: var(--text-muted); line-height: 1.6; }

/* ---- 合作品牌Logo墙 ---- */
.partner-logos {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    align-items: center;
    justify-content: center;
}
.partner-logo {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 14px 28px;
    font-size: .9rem;
    font-weight: 700;
    color: var(--text-muted);
    transition: border-color var(--transition), color var(--transition);
}
.partner-logo:hover { border-color: var(--rose); color: var(--rose); }

/* ---- 用户评价 ---- */
.review-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}
.review-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 22px 20px;
    border: 1px solid var(--border);
    transition: transform var(--transition);
}
.review-card:hover { transform: translateY(-3px); }
.review-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 14px;
}
.review-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg, #f06292, #c2185b);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    font-weight: 700;
    color: #fff;
    flex-shrink: 0;
}
.review-user h5 { font-size: .92rem; font-weight: 700; color: #fff; margin-bottom: 2px; }
.review-user .tag { font-size: .72rem; color: var(--rose); }
.stars { color: var(--gold); font-size: .9rem; margin-bottom: 10px; }
.review-card p { font-size: .85rem; color: var(--text-muted); line-height: 1.7; }
.review-date { font-size: .72rem; color: #555; margin-top: 10px; }

/* ---- FAQ ---- */
.faq-list { display: flex; flex-direction: column; gap: 12px; }
.faq-item {
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    overflow: hidden;
    transition: border-color var(--transition);
}
.faq-item:hover { border-color: rgba(240,98,146,.3); }
.faq-q {
    padding: 18px 22px;
    font-size: .95rem;
    font-weight: 700;
    color: #fff;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    user-select: none;
}
.faq-q::after {
    content: '+';
    font-size: 1.3rem;
    color: var(--rose);
    transition: transform var(--transition);
    flex-shrink: 0;
}
.faq-item.open .faq-q::after { transform: rotate(45deg); }
.faq-a {
    display: none;
    padding: 0 22px 18px;
    font-size: .88rem;
    color: var(--text-muted);
    line-height: 1.8;
}
.faq-item.open .faq-a { display: block; }

/* ---- 联系我们 ---- */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    align-items: start;
}
.contact-info h3 { font-size: 1.3rem; font-weight: 800; color: #fff; margin-bottom: 20px; }
.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    margin-bottom: 16px;
}
.contact-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: rgba(240,98,146,.12);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    flex-shrink: 0;
}
.contact-item .label { font-size: .8rem; color: var(--text-muted); margin-bottom: 2px; }
.contact-item .value { font-size: .92rem; color: #fff; font-weight: 600; }
.qr-group { display: flex; gap: 20px; margin-top: 24px; }
.qr-item { text-align: center; }
.qr-item img { width: 100px; height: 100px; border-radius: 8px; border: 2px solid var(--border); }
.qr-item p { font-size: .75rem; color: var(--text-muted); margin-top: 6px; }

/* ---- 加入社区指南 ---- */
.how-to-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    counter-reset: step;
}
.step-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 24px 18px;
    border: 1px solid var(--border);
    text-align: center;
    position: relative;
    transition: transform var(--transition);
}
.step-card:hover { transform: translateY(-3px); }
.step-num {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, #f06292, #c2185b);
    color: #fff;
    font-size: 1.1rem;
    font-weight: 900;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 14px;
}
.step-card h4 { font-size: .95rem; font-weight: 700; color: #fff; margin-bottom: 8px; }
.step-card p { font-size: .82rem; color: var(--text-muted); line-height: 1.6; }

/* ---- 分享按钮 ---- */
.share-bar {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: center;
}
.share-btn {
    padding: 8px 20px;
    border-radius: 20px;
    font-size: .85rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: opacity var(--transition), transform var(--transition);
    display: flex;
    align-items: center;
    gap: 6px;
}
.share-btn:hover { opacity: .85; transform: scale(.97); }
.share-wechat { background: #07c160; color: #fff; }
.share-weibo { background: #e6162d; color: #fff; }
.share-douyin { background: #000; color: #fff; border: 1px solid #333; }
.share-bili { background: #00a1d6; color: #fff; }

/* ---- 底部 ---- */
.site-footer {
    background: #08080d;
    border-top: 1px solid var(--border);
    padding: 48px 0 0;
    margin-top: 40px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--border);
}
.footer-brand .brand-name {
    font-size: 1.3rem;
    font-weight: 800;
    background: linear-gradient(135deg, #f06292, #ffd54f);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 12px;
}
.footer-brand p { font-size: .85rem; color: var(--text-muted); line-height: 1.8; margin-bottom: 16px; }
.footer-col h5 { font-size: .95rem; font-weight: 700; color: #fff; margin-bottom: 16px; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { font-size: .85rem; color: var(--text-muted); transition: color var(--transition); }
.footer-col ul li a:hover { color: var(--rose); }
.footer-bottom {
    padding: 20px 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    font-size: .8rem;
    color: var(--text-muted);
}
.footer-bottom a { color: var(--text-muted); }
.footer-bottom a:hover { color: var(--rose); }
.footer-logo-img { height: 28px; width: auto; margin-bottom: 10px; }

/* ---- 悬浮播放提示 ---- */
.video-modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.85);
    z-index: 9999;
    align-items: center;
    justify-content: center;
}
.video-modal-overlay.active { display: flex; }
.video-modal {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 24px;
    max-width: 640px;
    width: 90%;
    position: relative;
}
.video-modal-close {
    position: absolute;
    top: 12px;
    right: 16px;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
    background: none;
    border: none;
}
.video-modal video, .video-modal .video-placeholder {
    width: 100%;
    aspect-ratio: 16/9;
    background: #000;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: .9rem;
}

/* ---- 响应式 ---- */
@media (max-width: 1024px) {
    .ai-features { grid-template-columns: repeat(2, 1fr); }
    .community-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .how-to-steps { grid-template-columns: repeat(2, 1fr); }
    .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
    .main-nav { display: none; }
    .hero-content { padding: 56px 20px; }
    .hero-content h1 { font-size: 1.8rem; }
    .featured-grid { grid-template-columns: 1fr; }
    .video-grid { grid-template-columns: repeat(2, 1fr); }
    .ai-features { grid-template-columns: 1fr; }
    .community-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr; }
    .how-to-steps { grid-template-columns: 1fr 1fr; }
    .expert-grid { grid-template-columns: repeat(2, 1fr); }
    .section { padding: 36px 0; }
    .header-inner { padding: 0 16px; }
    .container { padding: 0 16px; }
}
@media (max-width: 480px) {
    .video-grid { grid-template-columns: 1fr; }
    .how-to-steps { grid-template-columns: 1fr; }
    .hero-stats { gap: 16px; }
    .hero-stat .num { font-size: 1.4rem; }
    .community-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ---- 汉堡菜单（移动端） ---- */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    gap: 5px;
    padding: 4px;
}
.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-main);
    border-radius: 2px;
    transition: transform var(--transition);
}
@media (max-width: 768px) {
    .mobile-menu-btn { display: flex; }
}

/* ---- 移动端导航抽屉 ---- */
.mobile-nav {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 75vw;
    max-width: 300px;
    height: 100vh;
    background: var(--bg-card);
    z-index: 10000;
    padding: 24px 20px;
    flex-direction: column;
    gap: 8px;
    box-shadow: 4px 0 32px rgba(0,0,0,.5);
    transform: translateX(-100%);
    transition: transform var(--transition);
}
.mobile-nav.open { display: flex; transform: translateX(0); }
.mobile-nav a {
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 1rem;
    color: var(--text-main);
    transition: background var(--transition);
}
.mobile-nav a:hover { background: rgba(240,98,146,.12); color: var(--rose); }
.mobile-nav-close {
    align-self: flex-end;
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    margin-bottom: 12px;
}

/* ---- 滚动动画 ---- */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity .6s ease, transform .6s ease;
}
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ---- 标签 ---- */
.badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 12px;
    font-size: .72rem;
    font-weight: 700;
    background: rgba(240,98,146,.15);
    color: var(--rose);
    margin-right: 6px;
}
.badge-gold { background: rgba(255,213,79,.12); color: var(--gold); }

/* ---- 内页横幅 ---- */
.inner-hero {
    background: linear-gradient(135deg, #1a0a10 0%, #0d0d12 100%);
    padding: 56px 0 40px;
    border-bottom: 1px solid var(--border);
}
.inner-hero h1 {
    font-size: 2rem;
    font-weight: 900;
    color: #fff;
    margin-bottom: 10px;
}
.inner-hero p { color: var(--text-muted); font-size: .95rem; }

/* ---- 分页 ---- */
.pagination {
    display: flex;
    gap: 8px;
    justify-content: center;
    margin-top: 40px;
    flex-wrap: wrap;
}
.page-btn {
    width: 38px;
    height: 38px;
    border-radius: 8px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: .88rem;
    cursor: pointer;
    transition: all var(--transition);
}
.page-btn:hover, .page-btn.active {
    background: var(--rose);
    border-color: var(--rose);
    color: #fff;
}

/* ---- 更新时间 ---- */
.update-time {
    font-size: .78rem;
    color: var(--text-muted);
    margin-top: 4px;
}

/* ---- SEO视频标签（隐藏显示，仅供百度爬虫识别视频属性）---- */
.seo-video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    pointer-events: none;
    z-index: 0;
    object-fit: cover;
}
/* 视频缩略图覆盖在video标签上方 */
.video-thumb img {
    position: relative;
    z-index: 1;
}
.video-thumb .play-btn-overlay {
    z-index: 2;
}
.video-thumb .video-tag,
.video-thumb .video-duration {
    z-index: 3;
}

/* ---- Hero副标题（h2，SEO层级）---- */
.hero-sub {
    font-size: 1.05rem;
    color: rgba(255,255,255,.82);
    max-width: 600px;
    margin-bottom: 28px;
    line-height: 1.8;
    font-weight: 400;
}

/* ---- 区块介绍段落 ---- */
.section-intro {
    font-size: .95rem;
    color: var(--text-muted);
    line-height: 1.9;
    max-width: 860px;
    margin-bottom: 8px;
}

/* ---- 视频弹窗video控件样式 ---- */
#modalVideo {
    background: #000;
    border-radius: 8px;
    outline: none;
}
#modalVideo::-webkit-media-controls {
    background: rgba(0,0,0,.6);
}

/* ---- 移动端video弹窗 ---- */
@media (max-width: 600px) {
    .video-modal { padding: 16px; }
    .video-modal-close { top: 8px; right: 10px; }
}