/* ============================================
   捷克接头 - 主样式文件
   rqyov.cn
   ============================================ */

/* CSS变量定义 */
:root {
    --primary: #1a2b5e;
    --primary-light: #2a3f8f;
    --accent: #e8a020;
    --accent-light: #f5c050;
    --bg-dark: #0d1526;
    --bg-medium: #162040;
    --bg-light: #f4f6fb;
    --text-main: #1e2d4a;
    --text-light: #5a6a8a;
    --text-white: #ffffff;
    --border: #dde3f0;
    --card-shadow: 0 4px 20px rgba(26,43,94,0.10);
    --hover-shadow: 0 8px 32px rgba(26,43,94,0.18);
    --radius: 12px;
    --radius-sm: 6px;
    --transition: 0.28s cubic-bezier(.4,0,.2,1);
}

/* 全局重置 */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', '微软雅黑', 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-main);
    background: var(--bg-light);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

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

a:hover {
    color: var(--accent);
}

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

ul, ol {
    list-style: none;
}

/* ============================================
   顶部公告栏
   ============================================ */
.top-bar {
    background: var(--primary);
    color: rgba(255,255,255,0.85);
    font-size: 13px;
    padding: 6px 0;
    text-align: center;
}

.top-bar a {
    color: var(--accent-light);
}

/* ============================================
   头部导航
   ============================================ */
.site-header {
    background: #fff;
    box-shadow: 0 2px 16px rgba(26,43,94,0.10);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-inner {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.site-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.site-logo img {
    height: 48px;
    width: auto;
}

.site-logo .logo-text {
    font-size: 22px;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: 1px;
}

.site-logo .logo-sub {
    font-size: 11px;
    color: var(--text-light);
    display: block;
    margin-top: -4px;
}

/* 主导航 */
.main-nav {
    display: flex;
    align-items: center;
    gap: 4px;
}

.main-nav a {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 500;
    color: var(--text-main);
    transition: all var(--transition);
    white-space: nowrap;
}

.main-nav a:hover,
.main-nav a.active {
    background: var(--primary);
    color: #fff;
}

/* 汉堡菜单 */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--primary);
    border-radius: 2px;
    transition: all var(--transition);
}

/* ============================================
   搜索框
   ============================================ */
.search-bar-wrap {
    background: var(--bg-light);
    border-bottom: 1px solid var(--border);
    padding: 12px 0;
}

.search-bar-inner {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: center;
}

.search-form {
    display: flex;
    width: 100%;
    max-width: 600px;
    border-radius: 30px;
    overflow: hidden;
    box-shadow: 0 2px 12px rgba(26,43,94,0.10);
    border: 1.5px solid var(--border);
    background: #fff;
}

.search-form input {
    flex: 1;
    border: none;
    outline: none;
    padding: 10px 20px;
    font-size: 15px;
    color: var(--text-main);
    background: transparent;
}

.search-form button {
    background: var(--primary);
    color: #fff;
    border: none;
    padding: 10px 24px;
    font-size: 15px;
    cursor: pointer;
    transition: background var(--transition);
    font-weight: 600;
}

.search-form button:hover {
    background: var(--primary-light);
}

/* ============================================
   面包屑
   ============================================ */
.breadcrumb {
    max-width: 1280px;
    margin: 0 auto;
    padding: 10px 24px;
    font-size: 13px;
    color: var(--text-light);
}

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

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

.breadcrumb span {
    margin: 0 6px;
}

/* ============================================
   Hero Banner
   ============================================ */
.hero-section {
    position: relative;
    overflow: hidden;
    background: var(--bg-dark);
    min-height: 520px;
    display: flex;
    align-items: center;
}

.hero-bg {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.45;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 1280px;
    margin: 0 auto;
    padding: 80px 24px;
    color: #fff;
}

.hero-badge {
    display: inline-block;
    background: var(--accent);
    color: #fff;
    font-size: 13px;
    font-weight: 700;
    padding: 4px 14px;
    border-radius: 20px;
    margin-bottom: 18px;
    letter-spacing: 1px;
}

.hero-content h1 {
    font-size: clamp(28px, 4vw, 52px);
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 18px;
    text-shadow: 0 2px 12px rgba(0,0,0,0.4);
}

.hero-content p {
    font-size: 18px;
    opacity: 0.9;
    max-width: 580px;
    margin-bottom: 32px;
    line-height: 1.8;
}

.hero-btns {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
    padding: 14px 32px;
    border-radius: 30px;
    font-size: 16px;
    font-weight: 700;
    border: none;
    cursor: pointer;
    transition: all var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary:hover {
    background: var(--accent-light);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(232,160,32,0.4);
}

.btn-outline {
    background: transparent;
    color: #fff;
    padding: 13px 32px;
    border-radius: 30px;
    font-size: 16px;
    font-weight: 600;
    border: 2px solid rgba(255,255,255,0.7);
    cursor: pointer;
    transition: all var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-outline:hover {
    background: rgba(255,255,255,0.15);
    color: #fff;
    border-color: #fff;
}

/* Hero 统计数据 */
.hero-stats {
    display: flex;
    gap: 40px;
    margin-top: 40px;
    flex-wrap: wrap;
}

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

.hero-stat .num {
    font-size: 32px;
    font-weight: 900;
    color: var(--accent-light);
    line-height: 1;
}

.hero-stat .label {
    font-size: 13px;
    opacity: 0.8;
    margin-top: 4px;
}

/* ============================================
   通用区块样式
   ============================================ */
.section {
    padding: 64px 0;
}

.section-alt {
    background: #fff;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-tag {
    display: inline-block;
    background: rgba(26,43,94,0.08);
    color: var(--primary);
    font-size: 13px;
    font-weight: 700;
    padding: 4px 14px;
    border-radius: 20px;
    margin-bottom: 12px;
    letter-spacing: 1px;
}

.section-title {
    font-size: clamp(22px, 3vw, 36px);
    font-weight: 800;
    color: var(--text-main);
    margin-bottom: 12px;
}

.section-desc {
    font-size: 16px;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.8;
}

/* ============================================
   视频卡片
   ============================================ */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.video-card {
    background: #fff;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--card-shadow);
    transition: all var(--transition);
    cursor: pointer;
}

.video-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--hover-shadow);
}

.video-thumb {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
    background: var(--bg-medium);
}

.video-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition);
}

.video-card:hover .video-thumb img {
    transform: scale(1.06);
}

.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 .play-btn {
    opacity: 1;
}

.play-icon {
    width: 60px;
    height: 60px;
    background: rgba(255,255,255,0.95);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transform: scale(0.8);
    transition: transform var(--transition);
}

.video-card:hover .play-icon {
    transform: scale(1);
}

.play-icon::after {
    content: '';
    border-left: 22px solid var(--primary);
    border-top: 13px solid transparent;
    border-bottom: 13px solid transparent;
    margin-left: 5px;
}

.video-duration {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background: rgba(0,0,0,0.75);
    color: #fff;
    font-size: 12px;
    padding: 2px 8px;
    border-radius: 4px;
}

.video-quality {
    position: absolute;
    top: 8px;
    left: 8px;
    background: var(--accent);
    color: #fff;
    font-size: 11px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 4px;
}

.video-info {
    padding: 14px 16px;
}

.video-title {
    font-size: 15px;
    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: 12px;
    font-size: 13px;
    color: var(--text-light);
}

.video-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.video-tags {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    margin-top: 8px;
}

.video-tag {
    background: rgba(26,43,94,0.07);
    color: var(--primary);
    font-size: 11px;
    padding: 2px 8px;
    border-radius: 10px;
}

/* ============================================
   功能模块卡片
   ============================================ */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 24px;
}

.feature-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 28px 24px;
    text-align: center;
    box-shadow: var(--card-shadow);
    transition: all var(--transition);
    border: 1.5px solid transparent;
}

.feature-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: var(--hover-shadow);
}

.feature-icon {
    width: 64px;
    height: 64px;
    border-radius: 16px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    font-size: 28px;
}

.feature-card h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.6;
}

/* ============================================
   专家展示
   ============================================ */
.expert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 28px;
}

.expert-card {
    background: #fff;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--card-shadow);
    transition: all var(--transition);
}

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

.expert-photo {
    aspect-ratio: 3/4;
    overflow: hidden;
    max-height: 280px;
}

.expert-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition);
}

.expert-card:hover .expert-photo img {
    transform: scale(1.04);
}

.expert-info {
    padding: 20px;
}

.expert-name {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 4px;
}

.expert-title {
    font-size: 13px;
    color: var(--accent);
    font-weight: 600;
    margin-bottom: 10px;
}

.expert-desc {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 14px;
}

.expert-awards {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 14px;
}

.award-badge {
    background: rgba(232,160,32,0.12);
    color: var(--accent);
    font-size: 11px;
    padding: 3px 10px;
    border-radius: 10px;
    font-weight: 600;
}

.expert-btns {
    display: flex;
    gap: 10px;
}

.btn-sm {
    flex: 1;
    text-align: center;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 600;
    transition: all var(--transition);
}

.btn-sm-primary {
    background: var(--primary);
    color: #fff;
}

.btn-sm-primary:hover {
    background: var(--primary-light);
    color: #fff;
}

.btn-sm-outline {
    border: 1.5px solid var(--primary);
    color: var(--primary);
}

.btn-sm-outline:hover {
    background: var(--primary);
    color: #fff;
}

/* ============================================
   评价区块
   ============================================ */
.review-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}

.review-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--card-shadow);
    border-left: 4px solid var(--accent);
    transition: all var(--transition);
}

.review-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--hover-shadow);
}

.review-stars {
    color: var(--accent);
    font-size: 16px;
    margin-bottom: 12px;
    letter-spacing: 2px;
}

.review-text {
    font-size: 15px;
    color: var(--text-main);
    line-height: 1.7;
    margin-bottom: 16px;
}

.reviewer {
    display: flex;
    align-items: center;
    gap: 12px;
}

.reviewer-avatar {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 16px;
    font-weight: 700;
    flex-shrink: 0;
}

.reviewer-name {
    font-size: 14px;
    font-weight: 700;
    color: var(--text-main);
}

.reviewer-date {
    font-size: 12px;
    color: var(--text-light);
}

/* ============================================
   FAQ
   ============================================ */
.faq-list {
    max-width: 860px;
    margin: 0 auto;
}

.faq-item {
    background: #fff;
    border-radius: var(--radius);
    margin-bottom: 12px;
    box-shadow: var(--card-shadow);
    overflow: hidden;
}

.faq-question {
    padding: 18px 24px;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-main);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background var(--transition);
}

.faq-question:hover {
    background: rgba(26,43,94,0.04);
}

.faq-question.active {
    color: var(--primary);
    background: rgba(26,43,94,0.04);
}

.faq-icon {
    font-size: 20px;
    font-weight: 300;
    transition: transform var(--transition);
    flex-shrink: 0;
    margin-left: 12px;
}

.faq-question.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0 24px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, padding 0.35s ease;
    font-size: 15px;
    color: var(--text-light);
    line-height: 1.8;
}

.faq-answer.open {
    padding: 0 24px 18px;
    max-height: 400px;
}

/* ============================================
   合作品牌
   ============================================ */
.partner-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
    align-items: center;
}

.partner-item {
    background: #fff;
    border-radius: var(--radius-sm);
    padding: 16px 28px;
    box-shadow: var(--card-shadow);
    font-size: 15px;
    font-weight: 700;
    color: var(--text-light);
    transition: all var(--transition);
    border: 1.5px solid var(--border);
}

.partner-item:hover {
    color: var(--primary);
    border-color: var(--primary);
    transform: translateY(-2px);
}

/* ============================================
   联系区块
   ============================================ */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 28px;
}

.contact-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 28px;
    box-shadow: var(--card-shadow);
    text-align: center;
}

.contact-icon {
    font-size: 40px;
    margin-bottom: 14px;
}

.contact-card h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 8px;
}

.contact-card p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.7;
}

.qrcode-wrap {
    display: flex;
    gap: 32px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 32px;
}

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

.qrcode-item img {
    width: 120px;
    height: 120px;
    border-radius: 8px;
    border: 2px solid var(--border);
    margin: 0 auto 8px;
}

.qrcode-item p {
    font-size: 13px;
    color: var(--text-light);
}

/* ============================================
   社交分享
   ============================================ */
.share-bar {
    background: var(--bg-medium);
    padding: 20px 0;
}

.share-inner {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
}

.share-label {
    color: rgba(255,255,255,0.7);
    font-size: 14px;
    font-weight: 600;
}

.share-btns {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.share-btn {
    padding: 8px 18px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    gap: 6px;
}

.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);
}

/* ============================================
   页脚
   ============================================ */
.site-footer {
    background: var(--bg-dark);
    color: rgba(255,255,255,0.75);
    padding: 56px 0 0;
}

.footer-grid {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-brand .logo-wrap {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.footer-brand img {
    height: 40px;
    filter: brightness(0) invert(1);
}

.footer-brand .brand-name {
    font-size: 20px;
    font-weight: 800;
    color: #fff;
}

.footer-brand p {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 20px;
    color: rgba(255,255,255,0.6);
}

.footer-col h4 {
    font-size: 15px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 16px;
}

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

.footer-col ul li a {
    color: rgba(255,255,255,0.6);
    font-size: 14px;
    transition: color var(--transition);
}

.footer-col ul li a:hover {
    color: var(--accent-light);
}

.footer-bottom {
    max-width: 1280px;
    margin: 0 auto;
    padding: 20px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 13px;
    color: rgba(255,255,255,0.45);
}

.footer-bottom a {
    color: rgba(255,255,255,0.45);
}

.footer-bottom a:hover {
    color: var(--accent-light);
}

/* ============================================
   内页 Hero
   ============================================ */
.page-hero {
    background: linear-gradient(135deg, var(--bg-dark) 0%, var(--bg-medium) 100%);
    padding: 56px 0;
    color: #fff;
    text-align: center;
}

.page-hero h1 {
    font-size: clamp(24px, 3.5vw, 42px);
    font-weight: 900;
    margin-bottom: 12px;
}

.page-hero p {
    font-size: 16px;
    opacity: 0.8;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.8;
}

/* ============================================
   标签筛选
   ============================================ */
.filter-bar {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 32px;
    justify-content: center;
}

.filter-btn {
    padding: 8px 20px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    border: 1.5px solid var(--border);
    background: #fff;
    color: var(--text-light);
    cursor: pointer;
    transition: all var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

/* ============================================
   分页
   ============================================ */
.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 48px;
}

.page-btn {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 600;
    border: 1.5px solid var(--border);
    background: #fff;
    color: var(--text-main);
    cursor: pointer;
    transition: all var(--transition);
}

.page-btn:hover,
.page-btn.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

/* ============================================
   加入社区 How-To
   ============================================ */
.howto-steps {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 24px;
    counter-reset: step;
}

.howto-step {
    background: #fff;
    border-radius: var(--radius);
    padding: 28px 24px;
    text-align: center;
    box-shadow: var(--card-shadow);
    position: relative;
}

.howto-step::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    top: -16px;
    left: 50%;
    transform: translateX(-50%);
    width: 32px;
    height: 32px;
    background: var(--accent);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 15px;
    font-weight: 800;
}

.howto-step h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 8px;
    margin-top: 8px;
}

.howto-step p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.6;
}

/* ============================================
   AI功能展示
   ============================================ */
.ai-section {
    background: linear-gradient(135deg, var(--primary) 0%, var(--bg-dark) 100%);
    color: #fff;
}

.ai-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 24px;
}

.ai-card {
    background: rgba(255,255,255,0.08);
    border-radius: var(--radius);
    padding: 28px 24px;
    border: 1px solid rgba(255,255,255,0.12);
    transition: all var(--transition);
}

.ai-card:hover {
    background: rgba(255,255,255,0.14);
    transform: translateY(-4px);
}

.ai-icon {
    font-size: 36px;
    margin-bottom: 14px;
}

.ai-card h3 {
    font-size: 17px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 8px;
}

.ai-card p {
    font-size: 14px;
    color: rgba(255,255,255,0.7);
    line-height: 1.7;
}

/* ============================================
   图片展示网格
   ============================================ */
.photo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 16px;
}

.photo-item {
    border-radius: var(--radius);
    overflow: hidden;
    aspect-ratio: 3/4;
    position: relative;
    cursor: pointer;
}

.photo-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition);
}

.photo-item:hover img {
    transform: scale(1.06);
}

.photo-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, transparent 60%);
    opacity: 0;
    transition: opacity var(--transition);
    display: flex;
    align-items: flex-end;
    padding: 16px;
}

.photo-item:hover .photo-overlay {
    opacity: 1;
}

.photo-overlay span {
    color: #fff;
    font-size: 14px;
    font-weight: 600;
}

/* ============================================
   弹幕效果
   ============================================ */
.danmaku-bar {
    background: rgba(0,0,0,0.85);
    padding: 10px 0;
    overflow: hidden;
    position: relative;
}

.danmaku-inner {
    display: flex;
    gap: 40px;
    animation: danmaku-scroll 30s linear infinite;
    white-space: nowrap;
}

.danmaku-item {
    color: rgba(255,255,255,0.85);
    font-size: 14px;
    padding: 4px 12px;
    background: rgba(255,255,255,0.08);
    border-radius: 12px;
    flex-shrink: 0;
}

@keyframes danmaku-scroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* ============================================
   响应式
   ============================================ */
@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .header-inner {
        height: 60px;
    }

    .main-nav {
        display: none;
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 16px;
        box-shadow: 0 8px 24px rgba(0,0,0,0.12);
        gap: 4px;
    }

    .main-nav.open {
        display: flex;
    }

    .main-nav a {
        padding: 12px 16px;
        width: 100%;
    }

    .menu-toggle {
        display: flex;
    }

    .hero-content {
        padding: 48px 24px;
    }

    .hero-stats {
        gap: 20px;
    }

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

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    .video-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    }
}

@media (max-width: 480px) {
    .section {
        padding: 40px 0;
    }

    .hero-content h1 {
        font-size: 24px;
    }

    .hero-btns {
        flex-direction: column;
    }

    .btn-primary, .btn-outline {
        width: 100%;
        justify-content: center;
    }
}

/* ============================================
   懒加载占位
   ============================================ */
.lazy-img {
    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; }
}

/* ============================================
   滚动动画
   ============================================ */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ============================================
   视频直播标识
   ============================================ */
.live-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: #e6162d;
    color: #fff;
    font-size: 12px;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 4px;
}

.live-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: #fff;
    animation: pulse 1.2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

/* ============================================
   通知提示
   ============================================ */
.toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background: var(--primary);
    color: #fff;
    padding: 14px 24px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 600;
    box-shadow: 0 8px 24px rgba(0,0,0,0.2);
    transform: translateY(80px);
    opacity: 0;
    transition: all 0.35s ease;
    z-index: 9999;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}