/* 糖心视频 - 主样式文件 | qeietx.cn */
/* ===== CSS变量 ===== */
:root {
    --primary: #e8507a;
    --primary-dark: #c73560;
    --primary-light: #f07a9a;
    --secondary: #ff8c42;
    --accent: #9b59b6;
    --dark: #1a1a2e;
    --dark2: #16213e;
    --dark3: #0f3460;
    --text: #333;
    --text-light: #666;
    --text-muted: #999;
    --bg: #f8f9fa;
    --bg2: #fff;
    --border: #e8e8e8;
    --shadow: 0 4px 20px rgba(232,80,122,0.12);
    --shadow-hover: 0 8px 32px rgba(232,80,122,0.22);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: 0.3s ease;
    --font: 'PingFang SC', 'Microsoft YaHei', '微软雅黑', sans-serif;
}

/* ===== 基础重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: var(--font);
    color: var(--text);
    background: var(--bg);
    line-height: 1.7;
    overflow-x: hidden;
}
a { text-decoration: none; color: inherit; transition: color var(--transition); }
a:hover { color: var(--primary); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; outline: none; font-family: var(--font); }

/* ===== 通用工具类 ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 60px 0; }
.section-header { text-align: center; margin-bottom: 40px; }
.section-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
    position: relative;
    display: inline-block;
}
.section-title::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 2px;
}
.section-desc { color: var(--text-light); font-size: 1rem; max-width: 600px; margin: 0 auto; }
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 50px;
    font-size: 0.95rem;
    font-weight: 600;
    transition: all var(--transition);
    cursor: pointer;
}
.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    box-shadow: 0 4px 15px rgba(232,80,122,0.35);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(232,80,122,0.45);
    color: #fff;
}
.btn-outline {
    border: 2px solid var(--primary);
    color: var(--primary);
    background: transparent;
}
.btn-outline:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-2px);
}
.tag {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 0.78rem;
    font-weight: 600;
    background: rgba(232,80,122,0.1);
    color: var(--primary);
}
.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.72rem;
    font-weight: 700;
    background: var(--primary);
    color: #fff;
}

/* ===== 顶部公告栏 ===== */
.top-bar {
    background: linear-gradient(90deg, var(--dark), var(--dark3));
    color: rgba(255,255,255,0.85);
    font-size: 0.82rem;
    padding: 7px 0;
    text-align: center;
}
.top-bar a { color: var(--primary-light); }

/* ===== 导航栏 ===== */
.header {
    background: #fff;
    box-shadow: 0 2px 20px rgba(0,0,0,0.08);
    position: sticky;
    top: 0;
    z-index: 1000;
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    max-width: 1200px;
    margin: 0 auto;
    gap: 20px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}
.logo-img { height: 44px; width: auto; }
.logo-text {
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.nav {
    display: flex;
    align-items: center;
    gap: 4px;
}
.nav a {
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.92rem;
    font-weight: 500;
    color: var(--text);
    transition: all var(--transition);
    white-space: nowrap;
}
.nav a:hover, .nav a.active {
    background: rgba(232,80,122,0.08);
    color: var(--primary);
}
.header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}
.btn-login {
    padding: 8px 20px;
    border-radius: 50px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    font-size: 0.88rem;
    font-weight: 600;
    transition: all var(--transition);
}
.btn-login:hover { transform: translateY(-1px); box-shadow: var(--shadow); color: #fff; }
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    background: none;
    cursor: pointer;
}
.menu-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: all var(--transition);
}

/* ===== 搜索框 ===== */
.search-bar {
    background: linear-gradient(135deg, var(--dark), var(--dark2));
    padding: 14px 0;
}
.search-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    gap: 12px;
}
.search-form {
    flex: 1;
    display: flex;
    align-items: center;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 50px;
    overflow: hidden;
    max-width: 600px;
    margin: 0 auto;
}
.search-form input {
    flex: 1;
    background: none;
    border: none;
    outline: none;
    padding: 10px 20px;
    color: #fff;
    font-size: 0.95rem;
    font-family: var(--font);
}
.search-form input::placeholder { color: rgba(255,255,255,0.5); }
.search-form button {
    background: var(--primary);
    color: #fff;
    border: none;
    padding: 10px 22px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transition);
    font-family: var(--font);
}
.search-form button:hover { background: var(--primary-dark); }
.search-tags { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.search-tags span { color: rgba(255,255,255,0.5); font-size: 0.82rem; }
.search-tags a {
    color: rgba(255,255,255,0.75);
    font-size: 0.82rem;
    padding: 3px 10px;
    border-radius: 20px;
    border: 1px solid rgba(255,255,255,0.2);
    transition: all var(--transition);
}
.search-tags a:hover { background: var(--primary); border-color: var(--primary); color: #fff; }

/* ===== Hero Banner ===== */
.hero {
    position: relative;
    min-height: 520px;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: var(--dark);
}
.hero-bg {
    position: absolute;
    inset: 0;
    background-image: url('/assets/images/banner-hero.jpg');
    background-size: cover;
    background-position: center;
    opacity: 0.45;
}
.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(26,26,46,0.85) 0%, rgba(15,52,96,0.6) 100%);
}
.hero-content {
    position: relative;
    z-index: 2;
    max-width: 1200px;
    margin: 0 auto;
    padding: 60px 20px;
}
.hero-label {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(232,80,122,0.2);
    border: 1px solid rgba(232,80,122,0.4);
    color: var(--primary-light);
    padding: 5px 14px;
    border-radius: 20px;
    font-size: 0.82rem;
    font-weight: 600;
    margin-bottom: 18px;
}
.hero h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    color: #fff;
    line-height: 1.2;
    margin-bottom: 16px;
}
.hero h1 span { color: var(--primary-light); }
.hero-desc {
    font-size: 1.1rem;
    color: rgba(255,255,255,0.75);
    max-width: 560px;
    margin-bottom: 32px;
    line-height: 1.8;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.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: 800;
    color: var(--primary-light);
    display: block;
}
.hero-stat .label { font-size: 0.82rem; color: rgba(255,255,255,0.6); }

/* ===== 视频卡片 ===== */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 20px;
}
.video-card {
    background: var(--bg2);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all var(--transition);
    cursor: pointer;
}
.video-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}
.video-thumb {
    position: relative;
    padding-top: 56.25%;
    overflow: hidden;
    background: var(--dark);
}
.video-thumb img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}
.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(0,0,0,0.3);
    opacity: 0;
    transition: opacity var(--transition);
}
.video-card:hover .video-play-btn { opacity: 1; }
.play-icon {
    width: 56px;
    height: 56px;
    background: rgba(232,80,122,0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
    transform: scale(0.8);
    transition: transform var(--transition);
}
.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: 8px;
    background: rgba(0,0,0,0.75);
    color: #fff;
    font-size: 0.75rem;
    padding: 2px 7px;
    border-radius: 4px;
}
.video-live-badge {
    position: absolute;
    top: 8px;
    left: 8px;
    background: #e53935;
    color: #fff;
    font-size: 0.72rem;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 4px;
    animation: pulse 1.5s infinite;
}
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}
.video-info { padding: 14px; }
.video-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 8px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.5;
}
.video-meta {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.8rem;
    color: var(--text-muted);
}
.video-meta span { display: flex; align-items: center; gap: 3px; }
.video-author {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 10px;
}
.author-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    object-fit: cover;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 0.75rem;
    font-weight: 700;
    flex-shrink: 0;
}
.author-name { font-size: 0.82rem; color: var(--text-light); }

/* ===== 分类标签栏 ===== */
.cat-tabs {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 28px;
}
.cat-tab {
    padding: 7px 18px;
    border-radius: 50px;
    font-size: 0.88rem;
    font-weight: 500;
    border: 1px solid var(--border);
    color: var(--text-light);
    background: var(--bg2);
    cursor: pointer;
    transition: all var(--transition);
}
.cat-tab:hover, .cat-tab.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}

/* ===== 专家卡片 ===== */
.expert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 24px;
}
.expert-card {
    background: var(--bg2);
    border-radius: var(--radius);
    padding: 24px 20px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all var(--transition);
    border: 1px solid var(--border);
}
.expert-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.expert-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    margin: 0 auto 14px;
    object-fit: cover;
    border: 3px solid var(--primary-light);
}
.expert-name { font-size: 1.05rem; font-weight: 700; margin-bottom: 4px; }
.expert-role { font-size: 0.82rem; color: var(--primary); margin-bottom: 8px; }
.expert-desc { font-size: 0.82rem; color: var(--text-light); margin-bottom: 14px; line-height: 1.6; }
.expert-awards { display: flex; gap: 6px; flex-wrap: wrap; justify-content: center; margin-bottom: 14px; }
.expert-actions { display: flex; gap: 8px; justify-content: center; }
.expert-actions a {
    padding: 6px 14px;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
    transition: all var(--transition);
}
.expert-actions .btn-contact {
    background: var(--primary);
    color: #fff;
}
.expert-actions .btn-works {
    border: 1px solid var(--border);
    color: var(--text-light);
}
.expert-actions .btn-works:hover { border-color: var(--primary); color: var(--primary); }

/* ===== 社区功能区 ===== */
.community-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
}
.community-card {
    background: var(--bg2);
    border-radius: var(--radius);
    padding: 28px 20px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all var(--transition);
    border: 1px solid var(--border);
    cursor: pointer;
}
.community-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: var(--primary-light); }
.community-icon {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    margin: 0 auto 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
}
.community-title { font-size: 1rem; font-weight: 700; margin-bottom: 6px; }
.community-desc { font-size: 0.82rem; color: var(--text-light); line-height: 1.6; }

/* ===== 合作品牌墙 ===== */
.partners-wall {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    justify-content: center;
    align-items: center;
}
.partner-item {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 14px 24px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-light);
    transition: all var(--transition);
    text-align: center;
    min-width: 120px;
}
.partner-item:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-2px); }

/* ===== 用户评价 ===== */
.review-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}
.review-card {
    background: var(--bg2);
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: all var(--transition);
}
.review-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.review-header { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.review-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1rem;
    font-weight: 700;
    flex-shrink: 0;
}
.review-user { flex: 1; }
.review-name { font-size: 0.92rem; font-weight: 700; }
.review-date { font-size: 0.78rem; color: var(--text-muted); }
.review-stars { color: #f59e0b; font-size: 0.9rem; margin-bottom: 10px; }
.review-text { font-size: 0.88rem; color: var(--text-light); line-height: 1.7; }
.review-tag { margin-top: 10px; }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
    background: var(--bg2);
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
    border: 1px solid var(--border);
    overflow: hidden;
    transition: all var(--transition);
}
.faq-item:hover { border-color: var(--primary-light); }
.faq-question {
    padding: 16px 20px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    user-select: none;
}
.faq-question::after {
    content: '+';
    font-size: 1.3rem;
    color: var(--primary);
    flex-shrink: 0;
    transition: transform var(--transition);
}
.faq-item.open .faq-question::after { transform: rotate(45deg); }
.faq-answer {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s ease;
    font-size: 0.88rem;
    color: var(--text-light);
    line-height: 1.8;
}
.faq-item.open .faq-answer { max-height: 300px; padding: 0 20px 16px; }

/* ===== 联系我们 ===== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    align-items: start;
}
.contact-info { background: var(--bg2); border-radius: var(--radius); padding: 32px; box-shadow: var(--shadow); }
.contact-info h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 20px; color: var(--dark); }
.contact-item { display: flex; align-items: flex-start; gap: 12px; margin-bottom: 16px; }
.contact-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: rgba(232,80,122,0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    flex-shrink: 0;
}
.contact-detail { flex: 1; }
.contact-label { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 2px; }
.contact-value { font-size: 0.92rem; font-weight: 600; color: var(--text); }
.qr-section { display: flex; gap: 20px; flex-wrap: wrap; }
.qr-item { text-align: center; }
.qr-item img { width: 120px; height: 120px; border-radius: var(--radius-sm); border: 1px solid var(--border); }
.qr-item p { font-size: 0.78rem; color: var(--text-muted); margin-top: 6px; }

/* ===== 社交分享 ===== */
.share-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}
.share-label { font-size: 0.88rem; color: var(--text-muted); }
.share-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 16px;
    border-radius: 50px;
    font-size: 0.82rem;
    font-weight: 600;
    transition: all var(--transition);
    cursor: pointer;
    border: none;
}
.share-wechat { background: #07c160; color: #fff; }
.share-weibo { background: #e6162d; color: #fff; }
.share-douyin { background: #000; color: #fff; }
.share-bilibili { background: #00a1d6; color: #fff; }
.share-btn:hover { opacity: 0.85; transform: translateY(-1px); }

/* ===== 面包屑 ===== */
.breadcrumb {
    background: var(--bg2);
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
}
.breadcrumb-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    color: var(--text-muted);
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .sep { color: var(--border); }
.breadcrumb .current { color: var(--primary); font-weight: 600; }

/* ===== 页脚 ===== */
.footer {
    background: var(--dark);
    color: rgba(255,255,255,0.75);
    padding: 50px 0 0;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px 40px;
}
.footer-brand .logo-text { font-size: 1.6rem; margin-bottom: 12px; display: block; }
.footer-brand p { font-size: 0.85rem; line-height: 1.8; color: rgba(255,255,255,0.55); margin-bottom: 16px; }
.footer-col h4 { font-size: 0.95rem; font-weight: 700; color: #fff; margin-bottom: 16px; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { font-size: 0.85rem; color: rgba(255,255,255,0.55); transition: color var(--transition); }
.footer-col ul li a:hover { color: var(--primary-light); }
.footer-social { display: flex; gap: 10px; margin-top: 16px; }
.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: 0.85rem;
    color: rgba(255,255,255,0.7);
    transition: all var(--transition);
    cursor: pointer;
}
.social-btn:hover { background: var(--primary); color: #fff; }
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.08);
    padding: 18px 20px;
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px;
    font-size: 0.82rem;
    color: rgba(255,255,255,0.4);
}
.footer-bottom a { color: rgba(255,255,255,0.4); }
.footer-bottom a:hover { color: var(--primary-light); }
.footer-qr { display: flex; gap: 20px; }
.footer-qr-item { text-align: center; }
.footer-qr-item img { width: 90px; height: 90px; border-radius: 8px; }
.footer-qr-item p { font-size: 0.72rem; color: rgba(255,255,255,0.45); margin-top: 5px; }

/* ===== 特色区块 ===== */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
}
.feature-card {
    background: var(--bg2);
    border-radius: var(--radius);
    padding: 24px 18px;
    text-align: center;
    border: 1px solid var(--border);
    transition: all var(--transition);
}
.feature-card:hover { border-color: var(--primary-light); transform: translateY(-3px); box-shadow: var(--shadow); }
.feature-icon { font-size: 2rem; margin-bottom: 12px; }
.feature-title { font-size: 0.95rem; font-weight: 700; margin-bottom: 6px; }
.feature-desc { font-size: 0.82rem; color: var(--text-light); line-height: 1.6; }

/* ===== AI赋能区 ===== */
.ai-section {
    background: linear-gradient(135deg, var(--dark) 0%, var(--dark3) 100%);
    color: #fff;
    padding: 60px 0;
    position: relative;
    overflow: hidden;
}
.ai-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(232,80,122,0.15) 0%, transparent 70%);
    pointer-events: none;
}
.ai-section .section-title { color: #fff; }
.ai-section .section-desc { color: rgba(255,255,255,0.65); }
.ai-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 20px;
}
.ai-card {
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: var(--radius);
    padding: 24px 20px;
    transition: all var(--transition);
    backdrop-filter: blur(8px);
}
.ai-card:hover { background: rgba(255,255,255,0.1); border-color: rgba(232,80,122,0.4); transform: translateY(-3px); }
.ai-card-icon { font-size: 2rem; margin-bottom: 12px; }
.ai-card-title { font-size: 1rem; font-weight: 700; color: #fff; margin-bottom: 8px; }
.ai-card-desc { font-size: 0.85rem; color: rgba(255,255,255,0.6); line-height: 1.7; }

/* ===== 内页Hero ===== */
.page-hero {
    background: linear-gradient(135deg, var(--dark) 0%, var(--dark3) 100%);
    padding: 50px 0;
    text-align: center;
    color: #fff;
}
.page-hero h1 { font-size: 2.2rem; font-weight: 800; margin-bottom: 10px; }
.page-hero p { font-size: 1rem; color: rgba(255,255,255,0.7); max-width: 600px; margin: 0 auto; }

/* ===== 加入社区 ===== */
.join-steps {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 20px;
    counter-reset: step;
}
.join-step {
    background: var(--bg2);
    border-radius: var(--radius);
    padding: 24px 20px;
    text-align: center;
    box-shadow: var(--shadow);
    position: relative;
    counter-increment: step;
}
.join-step::before {
    content: counter(step);
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    width: 28px;
    height: 28px;
    background: var(--primary);
    color: #fff;
    border-radius: 50%;
    font-size: 0.85rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
}
.join-step-icon { font-size: 2rem; margin-bottom: 12px; margin-top: 8px; }
.join-step-title { font-size: 0.95rem; font-weight: 700; margin-bottom: 6px; }
.join-step-desc { font-size: 0.82rem; color: var(--text-light); line-height: 1.6; }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
    .nav { display: none; flex-direction: column; position: absolute; top: 100%; left: 0; right: 0; background: #fff; padding: 12px; box-shadow: 0 8px 20px rgba(0,0,0,0.1); z-index: 999; }
    .nav.open { display: flex; }
    .nav a { padding: 12px 16px; border-radius: var(--radius-sm); }
    .menu-toggle { display: flex; }
    .header-inner { position: relative; }
    .hero h1 { font-size: 1.8rem; }
    .hero-stats { gap: 20px; }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
    .video-grid { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }
    .section { padding: 40px 0; }
    .section-title { font-size: 1.6rem; }
    .search-tags { display: none; }
}
@media (max-width: 480px) {
    .footer-grid { grid-template-columns: 1fr; }
    .hero-actions { flex-direction: column; }
    .video-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
    .expert-grid { grid-template-columns: 1fr 1fr; }
    .community-grid { grid-template-columns: 1fr 1fr; }
    .hero { min-height: 400px; }
}

/* ===== 动画 ===== */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(24px); }
    to { opacity: 1; transform: translateY(0); }
}
.fade-in-up { animation: fadeInUp 0.6s ease both; }
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }

/* ===== 懒加载占位 ===== */
img[data-src] { background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%); background-size: 200% 100%; animation: shimmer 1.5s infinite; }
@keyframes shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }

/* ===== 滚动条 ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: #f1f1f1; }
::-webkit-scrollbar-thumb { background: var(--primary-light); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--primary); }

/* ===== 选中颜色 ===== */
::selection { background: rgba(232,80,122,0.2); color: var(--primary-dark); }

/* ===== 内页内容区 ===== */
.page-content { padding: 50px 0; }
.page-intro {
    background: var(--bg2);
    border-radius: var(--radius);
    padding: 28px 32px;
    margin-bottom: 36px;
    border-left: 4px solid var(--primary);
    box-shadow: var(--shadow);
}
.page-intro p { font-size: 0.95rem; color: var(--text-light); line-height: 1.9; }

/* ===== 工具卡片 ===== */
.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 20px;
}
.tool-card {
    background: var(--bg2);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: all var(--transition);
}
.tool-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: var(--primary-light); }
.tool-icon { font-size: 2.2rem; margin-bottom: 12px; }
.tool-title { font-size: 1rem; font-weight: 700; margin-bottom: 6px; }
.tool-desc { font-size: 0.85rem; color: var(--text-light); line-height: 1.7; margin-bottom: 14px; }
.tool-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 18px;
    border-radius: 50px;
    background: rgba(232,80,122,0.1);
    color: var(--primary);
    font-size: 0.85rem;
    font-weight: 600;
    transition: all var(--transition);
}
.tool-btn:hover { background: var(--primary); color: #fff; }

/* ===== 奖项展示 ===== */
.award-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}
.award-card {
    background: var(--bg2);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all var(--transition);
    border: 1px solid var(--border);
}
.award-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.award-cover { position: relative; padding-top: 60%; overflow: hidden; }
.award-cover img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s; }
.award-card:hover .award-cover img { transform: scale(1.05); }
.award-badge {
    position: absolute;
    top: 10px;
    right: 10px;
    background: linear-gradient(135deg, #f59e0b, #ef4444);
    color: #fff;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
}
.award-body { padding: 16px; }
.award-title { font-size: 0.95rem; font-weight: 700; margin-bottom: 6px; }
.award-meta { font-size: 0.8rem; color: var(--text-muted); display: flex; gap: 12px; flex-wrap: wrap; }

/* ===== 通知条 ===== */
.notice-bar {
    background: rgba(232,80,122,0.08);
    border: 1px solid rgba(232,80,122,0.2);
    border-radius: var(--radius-sm);
    padding: 10px 16px;
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 24px;
    font-size: 0.88rem;
    color: var(--primary-dark);
}