/* ===================================================
   人兽 - 原创主题样式
   品牌色: 深蓝 #0d1b4b | 青蓝 #00c6ff | 紫色 #7b2ff7
   =================================================== */

:root {
    --brand-dark: #0d1b4b;
    --brand-blue: #1a6fe8;
    --brand-cyan: #00c6ff;
    --brand-purple: #7b2ff7;
    --brand-pink: #f72f8e;
    --brand-grad: linear-gradient(135deg, #1a6fe8 0%, #00c6ff 100%);
    --brand-grad2: linear-gradient(135deg, #7b2ff7 0%, #f72f8e 100%);
    --text-main: #1a1a2e;
    --text-sub: #4a4a6a;
    --text-light: #8888aa;
    --bg-main: #f4f6ff;
    --bg-card: #ffffff;
    --border: #e0e4f5;
    --shadow: 0 4px 24px rgba(26,111,232,0.10);
    --radius: 14px;
    --radius-sm: 8px;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
    background: var(--bg-main);
    color: var(--text-main);
    font-size: 15px;
    line-height: 1.7;
    overflow-x: hidden;
}

a { color: var(--brand-blue); text-decoration: none; transition: color .2s; }
a:hover { color: var(--brand-cyan); }

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

/* ---- 顶部公告栏 ---- */
.top-notice {
    background: var(--brand-grad);
    color: #fff;
    text-align: center;
    font-size: 13px;
    padding: 8px 20px;
    white-space: nowrap;
    overflow: hidden;
}
.top-notice span { display: inline-block; animation: marquee 30s linear infinite; }
@keyframes marquee { 0%{transform:translateX(100vw)} 100%{transform:translateX(-100%)} }

/* ---- 导航栏 ---- */
.navbar {
    background: #fff;
    box-shadow: 0 2px 16px rgba(26,111,232,0.08);
    position: sticky;
    top: 0;
    z-index: 1000;
}
.nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    height: 68px;
    gap: 20px;
}
.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}
.nav-logo img { height: 40px; width: auto; }
.nav-logo-text {
    font-size: 20px;
    font-weight: 800;
    background: var(--brand-grad);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.nav-menu {
    display: flex;
    list-style: none;
    gap: 4px;
    flex: 1;
}
.nav-menu a {
    display: block;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-main);
    transition: all .2s;
}
.nav-menu a:hover, .nav-menu a.active {
    background: var(--brand-grad);
    color: #fff;
}
.nav-join {
    background: var(--brand-grad2);
    color: #fff !important;
    padding: 8px 20px !important;
    border-radius: 24px !important;
    font-weight: 600 !important;
    flex-shrink: 0;
}
.nav-join:hover { opacity: .9; }
.hamburger { display: none; cursor: pointer; background: none; border: none; padding: 8px; }
.hamburger span { display: block; width: 24px; height: 2px; background: var(--brand-dark); margin: 5px 0; border-radius: 2px; transition: .3s; }

/* ---- 搜索栏 ---- */
.search-bar {
    background: linear-gradient(135deg, #0d1b4b 0%, #1a3a8f 100%);
    padding: 16px 20px;
}
.search-inner {
    max-width: 700px;
    margin: 0 auto;
    display: flex;
    gap: 0;
    border-radius: 40px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0,198,255,0.3);
}
.search-inner input {
    flex: 1;
    border: none;
    outline: none;
    padding: 12px 22px;
    font-size: 15px;
    background: rgba(255,255,255,0.95);
    color: var(--text-main);
}
.search-inner input::placeholder { color: var(--text-light); }
.search-btn {
    background: var(--brand-grad);
    color: #fff;
    border: none;
    padding: 12px 28px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: opacity .2s;
}
.search-btn:hover { opacity: .9; }
.search-hot {
    max-width: 700px;
    margin: 8px auto 0;
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}
.search-hot span { color: rgba(255,255,255,0.6); font-size: 13px; }
.search-hot a {
    color: rgba(255,255,255,0.85);
    font-size: 13px;
    background: rgba(255,255,255,0.12);
    padding: 2px 10px;
    border-radius: 12px;
    transition: background .2s;
}
.search-hot a:hover { background: rgba(255,255,255,0.25); color: #fff; }

/* ---- Hero 区 ---- */
.hero {
    position: relative;
    min-height: 520px;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: var(--brand-dark);
}
.hero-bg {
    position: absolute;
    inset: 0;
    background-image: url('../images/hero_anime.jpg');
    background-size: cover;
    background-position: center top;
    opacity: 0.45;
}
.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, rgba(13,27,75,0.92) 0%, rgba(13,27,75,0.4) 60%, transparent 100%);
}
.hero-content {
    position: relative;
    max-width: 1200px;
    margin: 0 auto;
    padding: 60px 20px;
    z-index: 1;
}
.hero-tag {
    display: inline-block;
    background: var(--brand-grad2);
    color: #fff;
    font-size: 12px;
    font-weight: 700;
    padding: 4px 14px;
    border-radius: 20px;
    margin-bottom: 16px;
    letter-spacing: 1px;
}
.hero h1 {
    font-size: clamp(32px, 5vw, 56px);
    font-weight: 900;
    color: #fff;
    line-height: 1.2;
    margin-bottom: 16px;
}
.hero h1 .brand-hl {
    background: var(--brand-grad);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-desc {
    color: rgba(255,255,255,0.82);
    font-size: 16px;
    max-width: 520px;
    margin-bottom: 32px;
    line-height: 1.8;
}
.hero-stats {
    display: flex;
    gap: 32px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}
.hero-stat .num {
    font-size: 28px;
    font-weight: 800;
    color: var(--brand-cyan);
}
.hero-stat .label { color: rgba(255,255,255,0.65); font-size: 13px; }
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; }
.btn-primary {
    background: var(--brand-grad);
    color: #fff;
    padding: 13px 30px;
    border-radius: 30px;
    font-weight: 700;
    font-size: 15px;
    transition: transform .2s, box-shadow .2s;
    box-shadow: 0 4px 16px rgba(0,198,255,0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,198,255,0.45); color: #fff; }
.btn-outline {
    border: 2px solid rgba(255,255,255,0.5);
    color: #fff;
    padding: 11px 28px;
    border-radius: 30px;
    font-weight: 600;
    font-size: 15px;
    transition: all .2s;
}
.btn-outline:hover { background: rgba(255,255,255,0.15); color: #fff; }

/* ---- 通用容器 ---- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 70px 0; }
.section-alt { background: #fff; }
.section-dark { background: linear-gradient(135deg, #0d1b4b 0%, #1a2a6c 100%); }
.section-title {
    text-align: center;
    margin-bottom: 50px;
}
.section-title h2 {
    font-size: clamp(24px, 3.5vw, 36px);
    font-weight: 800;
    color: var(--text-main);
    margin-bottom: 12px;
}
.section-dark .section-title h2 { color: #fff; }
.section-title .sub {
    color: var(--text-sub);
    font-size: 15px;
    max-width: 560px;
    margin: 0 auto;
}
.section-dark .section-title .sub { color: rgba(255,255,255,0.65); }
.title-line {
    width: 60px;
    height: 4px;
    background: var(--brand-grad);
    border-radius: 2px;
    margin: 14px auto 0;
}

/* ---- 分类筛选 ---- */
.filter-tabs {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 30px;
    justify-content: center;
}
.filter-tab {
    padding: 7px 18px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    border: 1.5px solid var(--border);
    background: #fff;
    color: var(--text-sub);
    transition: all .2s;
}
.filter-tab:hover, .filter-tab.active {
    background: var(--brand-grad);
    color: #fff;
    border-color: transparent;
}

/* ---- 动漫视频卡片 ---- */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 22px;
}
.video-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform .25s, box-shadow .25s;
    cursor: pointer;
}
.video-card:hover { transform: translateY(-6px); box-shadow: 0 12px 40px rgba(26,111,232,0.18); }
.video-thumb {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
    background: #0d1b4b;
}
.video-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .4s;
}
.video-card:hover .video-thumb img { transform: scale(1.06); }
.video-play-btn {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(13,27,75,0.45);
    opacity: 0;
    transition: opacity .25s;
}
.video-card:hover .video-play-btn { opacity: 1; }
.play-circle {
    width: 54px;
    height: 54px;
    border-radius: 50%;
    background: rgba(255,255,255,0.92);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    transform: scale(0.85);
    transition: transform .25s;
}
.video-card:hover .play-circle { transform: scale(1); }
.play-circle::after {
    content: '';
    border-style: solid;
    border-width: 10px 0 10px 18px;
    border-color: transparent transparent transparent var(--brand-blue);
    margin-left: 3px;
}
.video-badge {
    position: absolute;
    top: 10px;
    left: 10px;
    background: var(--brand-grad2);
    color: #fff;
    font-size: 11px;
    font-weight: 700;
    padding: 3px 9px;
    border-radius: 10px;
}
.video-duration {
    position: absolute;
    bottom: 10px;
    right: 10px;
    background: rgba(0,0,0,0.7);
    color: #fff;
    font-size: 12px;
    padding: 2px 8px;
    border-radius: 6px;
}
.video-info { padding: 14px 16px; }
.video-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 8px;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.video-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--text-light);
}
.video-author {
    display: flex;
    align-items: center;
    gap: 6px;
}
.author-avatar {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--brand-grad);
    color: #fff;
    font-size: 11px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
}
.video-stats { display: flex; gap: 12px; margin-top: 6px; font-size: 12px; color: var(--text-light); }
.video-stats span { display: flex; align-items: center; gap: 3px; }

/* ---- 服务卡片 ---- */
.service-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}
.service-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 30px 28px;
    box-shadow: var(--shadow);
    border: 1.5px solid var(--border);
    transition: transform .25s, border-color .25s;
}
.service-card:hover { transform: translateY(-4px); border-color: var(--brand-cyan); }
.service-icon {
    width: 56px;
    height: 56px;
    border-radius: 16px;
    background: var(--brand-grad);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    margin-bottom: 18px;
}
.service-card h3 { font-size: 17px; font-weight: 700; margin-bottom: 10px; }
.service-card p { color: var(--text-sub); font-size: 14px; line-height: 1.7; }

/* ---- 娱乐专区 ---- */
.ent-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 20px;
}
.ent-card {
    border-radius: var(--radius);
    overflow: hidden;
    position: relative;
    min-height: 200px;
    background: var(--brand-dark);
    cursor: pointer;
}
.ent-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    opacity: 0.6;
    transition: opacity .3s, transform .3s;
}
.ent-card:hover img { opacity: 0.8; transform: scale(1.05); }
.ent-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 20px 18px 18px;
    background: linear-gradient(transparent, rgba(13,27,75,0.9));
}
.ent-overlay h3 { color: #fff; font-size: 16px; font-weight: 700; margin-bottom: 4px; }
.ent-overlay p { color: rgba(255,255,255,0.7); font-size: 13px; }
.ent-tag {
    position: absolute;
    top: 12px;
    right: 12px;
    background: var(--brand-grad2);
    color: #fff;
    font-size: 11px;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 10px;
}

/* ---- AI赋能 ---- */
.ai-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    align-items: center;
}
.ai-features { display: flex; flex-direction: column; gap: 20px; }
.ai-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    background: rgba(255,255,255,0.06);
    border-radius: var(--radius);
    padding: 20px;
    border: 1px solid rgba(255,255,255,0.1);
    transition: background .2s;
}
.ai-item:hover { background: rgba(255,255,255,0.10); }
.ai-item-icon {
    font-size: 28px;
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    background: rgba(0,198,255,0.15);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.ai-item h4 { color: #fff; font-size: 15px; font-weight: 700; margin-bottom: 6px; }
.ai-item p { color: rgba(255,255,255,0.65); font-size: 13px; line-height: 1.6; }
.ai-img { border-radius: var(--radius); overflow: hidden; box-shadow: 0 20px 60px rgba(0,0,0,0.4); }
.ai-img img { width: 100%; height: 360px; object-fit: cover; }

/* ---- 社区功能 ---- */
.community-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 20px;
}
.community-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 28px 22px;
    text-align: center;
    box-shadow: var(--shadow);
    border: 1.5px solid var(--border);
    transition: transform .25s;
}
.community-card:hover { transform: translateY(-4px); }
.community-icon { font-size: 36px; margin-bottom: 14px; }
.community-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.community-card p { color: var(--text-sub); font-size: 13px; }
.community-num { font-size: 20px; font-weight: 800; color: var(--brand-blue); margin-top: 10px; }

/* ---- 专家团队 ---- */
.experts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 24px;
}
.expert-card {
    background: #fff;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    text-align: center;
    transition: transform .25s;
}
.expert-card:hover { transform: translateY(-5px); }
.expert-photo { width: 100%; height: 220px; object-fit: cover; }
.expert-info { padding: 18px 16px; }
.expert-name { font-size: 17px; font-weight: 800; margin-bottom: 4px; }
.expert-title { color: var(--brand-blue); font-size: 13px; margin-bottom: 10px; }
.expert-desc { color: var(--text-sub); font-size: 13px; line-height: 1.6; margin-bottom: 14px; }
.expert-tags { display: flex; gap: 6px; flex-wrap: wrap; justify-content: center; margin-bottom: 14px; }
.expert-tag {
    background: var(--bg-main);
    color: var(--brand-blue);
    font-size: 11px;
    padding: 3px 10px;
    border-radius: 10px;
    font-weight: 600;
}
.expert-btns { display: flex; gap: 8px; justify-content: center; }
.btn-sm {
    padding: 7px 16px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    transition: all .2s;
}
.btn-sm-primary { background: var(--brand-grad); color: #fff; }
.btn-sm-outline { border: 1.5px solid var(--brand-blue); color: var(--brand-blue); }
.btn-sm:hover { opacity: .85; }

/* ---- 评价 ---- */
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 22px;
}
.review-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 24px 22px;
    box-shadow: var(--shadow);
    border-left: 4px solid var(--brand-cyan);
}
.review-stars { color: #ffc107; font-size: 16px; margin-bottom: 10px; }
.review-text { color: var(--text-sub); font-size: 14px; line-height: 1.7; margin-bottom: 14px; font-style: italic; }
.review-author { display: flex; align-items: center; gap: 10px; }
.review-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--brand-grad);
    color: #fff;
    font-size: 14px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
}
.review-name { font-weight: 700; font-size: 14px; }
.review-date { color: var(--text-light); font-size: 12px; }

/* ---- FAQ ---- */
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }
.faq-item {
    background: #fff;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    border: 1.5px solid var(--border);
}
.faq-q {
    padding: 18px 22px;
    font-weight: 700;
    font-size: 15px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background .2s;
    user-select: none;
}
.faq-q:hover { background: var(--bg-main); }
.faq-q .faq-icon {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--brand-grad);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    flex-shrink: 0;
    transition: transform .3s;
}
.faq-item.open .faq-icon { transform: rotate(45deg); }
.faq-a {
    padding: 0 22px;
    max-height: 0;
    overflow: hidden;
    transition: max-height .35s ease, padding .35s;
    color: var(--text-sub);
    font-size: 14px;
    line-height: 1.8;
}
.faq-item.open .faq-a { max-height: 300px; padding: 0 22px 18px; }

/* ---- 合作品牌 ---- */
.partners-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    justify-content: center;
}
.partner-item {
    background: #fff;
    border-radius: var(--radius-sm);
    padding: 14px 24px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-sub);
    box-shadow: var(--shadow);
    border: 1.5px solid var(--border);
    transition: all .2s;
}
.partner-item:hover { border-color: var(--brand-cyan); color: var(--brand-blue); }

/* ---- 联系我们 ---- */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: start;
}
.contact-info h3 { font-size: 22px; font-weight: 800; margin-bottom: 20px; }
.contact-item {
    display: flex;
    gap: 14px;
    align-items: flex-start;
    margin-bottom: 16px;
}
.contact-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: var(--brand-grad);
    color: #fff;
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}
.contact-item-text .label { font-weight: 700; font-size: 14px; margin-bottom: 2px; }
.contact-item-text .val { color: var(--text-sub); font-size: 14px; }
.contact-form { background: #fff; border-radius: var(--radius); padding: 30px; box-shadow: var(--shadow); }
.contact-form h3 { font-size: 18px; font-weight: 700; margin-bottom: 20px; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; color: var(--text-sub); }
.form-group input, .form-group select, .form-group textarea {
    width: 100%;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 10px 14px;
    font-size: 14px;
    outline: none;
    transition: border-color .2s;
    font-family: inherit;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { border-color: var(--brand-cyan); }
.form-group textarea { min-height: 100px; resize: vertical; }
.btn-submit {
    width: 100%;
    background: var(--brand-grad);
    color: #fff;
    border: none;
    padding: 13px;
    border-radius: 30px;
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
    transition: opacity .2s;
}
.btn-submit:hover { opacity: .9; }

/* ---- 加入社区 CTA ---- */
.cta-section {
    background: var(--brand-grad);
    padding: 70px 20px;
    text-align: center;
}
.cta-section h2 { color: #fff; font-size: 32px; font-weight: 800; margin-bottom: 14px; }
.cta-section p { color: rgba(255,255,255,0.85); font-size: 16px; margin-bottom: 30px; }
.btn-cta {
    background: #fff;
    color: var(--brand-blue);
    padding: 14px 40px;
    border-radius: 30px;
    font-weight: 800;
    font-size: 16px;
    display: inline-block;
    transition: transform .2s;
}
.btn-cta:hover { transform: scale(1.04); color: var(--brand-blue); }

/* ---- 分享按钮 ---- */
.share-bar {
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
}
.share-label { font-size: 13px; color: var(--text-light); }
.share-btn {
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    border: 1.5px solid var(--border);
    background: #fff;
    transition: all .2s;
}
.share-btn:hover { background: var(--brand-grad); color: #fff; border-color: transparent; }

/* ---- 页脚 ---- */
.footer {
    background: #0a1235;
    color: rgba(255,255,255,0.75);
    padding: 60px 0 0;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}
.footer-brand img { height: 36px; margin-bottom: 14px; }
.footer-brand p { font-size: 13px; line-height: 1.7; color: rgba(255,255,255,0.55); margin-bottom: 16px; }
.footer-social { display: flex; gap: 10px; }
.social-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(255,255,255,0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    transition: background .2s;
    cursor: pointer;
    color: #fff;
}
.social-btn:hover { background: var(--brand-blue); }
.footer-col h4 { color: #fff; font-size: 15px; font-weight: 700; margin-bottom: 16px; }
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul a { color: rgba(255,255,255,0.55); font-size: 13px; transition: color .2s; }
.footer-col ul a:hover { color: var(--brand-cyan); }
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding: 20px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    font-size: 13px;
    color: rgba(255,255,255,0.4);
}
.footer-bottom a { color: rgba(255,255,255,0.4); }
.footer-bottom a:hover { color: var(--brand-cyan); }

/* ---- 悬浮社交 ---- */
.float-social {
    position: fixed;
    right: 20px;
    bottom: 80px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 999;
}
.float-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--brand-blue);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    box-shadow: 0 4px 14px rgba(26,111,232,0.35);
    cursor: pointer;
    transition: transform .2s;
    text-decoration: none;
}
.float-btn:hover { transform: scale(1.12); color: #fff; }

/* ---- 今日更新条 ---- */
.update-bar {
    background: rgba(0,198,255,0.08);
    border-left: 4px solid var(--brand-cyan);
    padding: 10px 18px;
    border-radius: 0 8px 8px 0;
    font-size: 13px;
    color: var(--text-sub);
    margin-bottom: 24px;
}
.update-bar strong { color: var(--brand-blue); }

/* ---- 响应式 ---- */
@media (max-width: 900px) {
    .ai-grid { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
    .nav-menu { display: none; }
    .hamburger { display: block; }
    .nav-menu.open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 68px;
        left: 0;
        right: 0;
        background: #fff;
        padding: 16px 20px;
        box-shadow: 0 8px 24px rgba(0,0,0,0.1);
        z-index: 999;
    }
    .hero { min-height: 400px; }
    .hero h1 { font-size: 28px; }
    .hero-stats { gap: 20px; }
    .section { padding: 50px 0; }
    .video-grid { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }
    .footer-grid { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
    .video-grid { grid-template-columns: 1fr 1fr; }
    .experts-grid { grid-template-columns: 1fr 1fr; }
    .reviews-grid { grid-template-columns: 1fr; }
}

/* ---- 懒加载占位 ---- */
img[data-src] { background: linear-gradient(90deg, #e8eaf0 25%, #f4f6ff 50%, #e8eaf0 75%); background-size: 200% 100%; animation: shimmer 1.5s infinite; }
@keyframes shimmer { 0%{background-position:200% 0} 100%{background-position:-200% 0} }

/* ---- 滚动动画 ---- */
.fade-in { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.fade-in.visible { opacity: 1; transform: none; }