/* 捷克街头 - 原创样式表 */
/* 配色方案: 深靛紫 #1a0b3e, 电光蓝 #00e5ff, 霓虹紫 #7c3aed, 暗夜蓝 #0f172a */

:root {
    --primary: #7c3aed;
    --primary-dark: #5b21b6;
    --accent: #00e5ff;
    --accent-glow: rgba(0, 229, 255, 0.3);
    --bg-dark: #0f172a;
    --bg-card: #1e293b;
    --bg-section: #151d30;
    --text-main: #e2e8f0;
    --text-muted: #94a3b8;
    --text-bright: #ffffff;
    --border: #334155;
    --gradient-hero: linear-gradient(135deg, #1a0b3e 0%, #0f172a 50%, #0c1426 100%);
    --gradient-card: linear-gradient(145deg, #1e293b 0%, #0f172a 100%);
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 20px rgba(124, 58, 237, 0.2);
}

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

html { scroll-behavior: smooth; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.7;
    min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; transition: color 0.3s; }
a:hover { color: var(--primary); }

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

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

/* 顶部导航 */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.header-wrap {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
}

.brand-link {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-bright);
}

.brand-link img { width: 40px; height: 40px; border-radius: 8px; }

.brand-name { font-size: 1.25rem; font-weight: 700; }
.brand-sub { font-size: 0.7rem; color: var(--text-muted); }

.nav-list {
    display: flex;
    list-style: none;
    gap: 6px;
}

.nav-list a {
    display: block;
    padding: 8px 16px;
    color: var(--text-main);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    transition: all 0.3s;
}

.nav-list a:hover, .nav-list a.active {
    background: var(--primary);
    color: var(--text-bright);
}

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

.menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-main);
    border-radius: 2px;
    transition: 0.3s;
}

/* 搜索栏 */
.search-wrap {
    background: var(--bg-section);
    padding: 16px 0;
    border-bottom: 1px solid var(--border);
}

.search-box {
    display: flex;
    max-width: 600px;
    margin: 0 auto;
    background: var(--bg-card);
    border-radius: 50px;
    border: 1px solid var(--border);
    overflow: hidden;
    transition: border-color 0.3s;
}

.search-box:focus-within { border-color: var(--primary); }

.search-box input {
    flex: 1;
    padding: 12px 24px;
    background: transparent;
    border: none;
    color: var(--text-main);
    font-size: 0.95rem;
    outline: none;
}

.search-box input::placeholder { color: var(--text-muted); }

.search-box button {
    padding: 12px 28px;
    background: var(--primary);
    color: white;
    border: none;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    transition: background 0.3s;
}

.search-box button:hover { background: var(--primary-dark); }

.hot-tags {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 10px;
    flex-wrap: wrap;
}

.hot-tag {
    padding: 4px 12px;
    background: var(--bg-card);
    border-radius: 20px;
    font-size: 0.75rem;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.3s;
}

.hot-tag:hover { background: var(--primary); color: white; }

/* Hero区域 */
.hero-area {
    position: relative;
    padding: 80px 0;
    overflow: hidden;
    background: var(--gradient-hero);
}

.hero-bg-img {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    opacity: 0.25;
}

.hero-inner {
    position: relative;
    z-index: 2;
    text-align: center;
}

.hero-tag {
    display: inline-block;
    padding: 6px 18px;
    background: rgba(124, 58, 237, 0.2);
    border: 1px solid var(--primary);
    border-radius: 50px;
    font-size: 0.8rem;
    color: var(--accent);
    margin-bottom: 20px;
}

.hero-h1 {
    font-size: 2.8rem;
    font-weight: 800;
    color: var(--text-bright);
    margin-bottom: 16px;
    line-height: 1.3;
}

.hero-h1 em {
    font-style: normal;
    background: linear-gradient(90deg, var(--accent), var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-p {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 680px;
    margin: 0 auto 30px;
}

.hero-actions { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }

.btn-main {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    background: var(--primary);
    color: white;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
}

.btn-main:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: var(--shadow-glow); color: white; }

.btn-ghost {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    background: transparent;
    color: var(--accent);
    border: 1px solid var(--accent);
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.3s;
    cursor: pointer;
}

.btn-ghost:hover { background: rgba(0, 229, 255, 0.1); transform: translateY(-2px); }

.hero-nums {
    display: flex;
    justify-content: center;
    gap: 48px;
    margin-top: 48px;
}

.hero-num-item { text-align: center; }
.hero-num-val { font-size: 1.8rem; font-weight: 800; color: var(--accent); }
.hero-num-label { font-size: 0.8rem; color: var(--text-muted); margin-top: 4px; }

/* 通用Section */
.sec { padding: 64px 0; }
.sec-alt { background: var(--bg-section); }

.sec-head { text-align: center; margin-bottom: 40px; }
.sec-tag {
    display: inline-block;
    padding: 4px 14px;
    background: rgba(124, 58, 237, 0.15);
    border-radius: 20px;
    font-size: 0.75rem;
    color: var(--primary);
    margin-bottom: 10px;
    font-weight: 600;
}

.sec-h2 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-bright);
    margin-bottom: 10px;
}

.sec-desc {
    font-size: 0.95rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto;
}

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

.vid-card {
    background: var(--gradient-card);
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
    transition: all 0.3s;
}

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

.vid-thumb {
    position: relative;
    padding-top: 56.25%;
    overflow: hidden;
}

.vid-thumb img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s;
}

.vid-card:hover .vid-thumb img { transform: scale(1.05); }

.vid-play {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.4);
    opacity: 0;
    transition: opacity 0.3s;
}

.vid-card:hover .vid-play { opacity: 1; }

.vid-play-btn {
    width: 56px;
    height: 56px;
    background: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.vid-play-btn::after {
    content: '';
    border-style: solid;
    border-width: 10px 0 10px 18px;
    border-color: transparent transparent transparent white;
    margin-left: 4px;
}

.vid-body { padding: 16px; }
.vid-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-bright);
    margin-bottom: 8px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.vid-meta {
    display: flex;
    gap: 12px;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.vid-tag {
    display: inline-block;
    padding: 2px 8px;
    background: rgba(124, 58, 237, 0.15);
    border-radius: 4px;
    font-size: 0.7rem;
    color: var(--primary);
    margin-top: 8px;
}

/* 精选大卡片 */
.feat-card {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 24px;
    background: var(--gradient-card);
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
    margin-bottom: 32px;
}

.feat-thumb {
    position: relative;
    min-height: 300px;
}

.feat-thumb img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.feat-thumb .vid-play { opacity: 0; transition: opacity 0.3s; }
.feat-card:hover .feat-thumb .vid-play { opacity: 1; }

.feat-body {
    padding: 32px 24px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.feat-body h3 {
    font-size: 1.3rem;
    color: var(--text-bright);
    margin-bottom: 12px;
}

.feat-body p { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 16px; }

/* AI功能卡片 */
.ai-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
}

.ai-item {
    background: var(--gradient-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px 24px;
    text-align: center;
    transition: all 0.3s;
}

.ai-item:hover {
    border-color: var(--accent);
    box-shadow: 0 0 16px var(--accent-glow);
    transform: translateY(-3px);
}

.ai-icon { font-size: 2.2rem; margin-bottom: 14px; }
.ai-item h3 { font-size: 1rem; color: var(--text-bright); margin-bottom: 8px; }
.ai-item p { font-size: 0.85rem; color: var(--text-muted); }

/* 专家卡片 */
.expert-row {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}

.expert-item {
    background: var(--gradient-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    text-align: center;
    transition: all 0.3s;
}

.expert-item:hover { border-color: var(--primary); transform: translateY(-3px); }

.expert-img {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    object-fit: cover;
    margin: 0 auto 14px;
    border: 3px solid var(--primary);
}

.expert-item h3 { font-size: 1.05rem; color: var(--text-bright); margin-bottom: 4px; }
.expert-role { font-size: 0.8rem; color: var(--accent); margin-bottom: 10px; }
.expert-desc { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 12px; }

.badge-row { display: flex; justify-content: center; gap: 6px; flex-wrap: wrap; margin-bottom: 14px; }
.badge-item {
    padding: 3px 10px;
    background: rgba(0, 229, 255, 0.1);
    border-radius: 4px;
    font-size: 0.7rem;
    color: var(--accent);
}

.expert-btns { display: flex; justify-content: center; gap: 10px; }
.btn-xs {
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    transition: all 0.3s;
    cursor: pointer;
}

.btn-xs-fill { background: var(--primary); color: white; border: none; }
.btn-xs-fill:hover { background: var(--primary-dark); }
.btn-xs-line { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
.btn-xs-line:hover { background: rgba(0, 229, 255, 0.1); }

/* 合作品牌 */
.partner-wall {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
}

.partner-box {
    padding: 12px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    color: var(--text-muted);
    transition: all 0.3s;
}

.partner-box:hover { border-color: var(--primary); color: var(--text-bright); }

/* FAQ */
.faq-list { max-width: 800px; margin: 0 auto; }

.faq-item {
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
    overflow: hidden;
    background: var(--bg-card);
}

.faq-q {
    padding: 16px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-weight: 600;
    color: var(--text-bright);
    transition: background 0.3s;
}

.faq-q:hover { background: rgba(124, 58, 237, 0.1); }

.faq-arrow {
    font-size: 1.2rem;
    transition: transform 0.3s;
    color: var(--primary);
}

.faq-item.open .faq-arrow { transform: rotate(180deg); }

.faq-a {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.faq-item.open .faq-a { padding: 0 20px 16px; max-height: 300px; }

/* 用户评价 */
.review-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.review-box {
    background: var(--gradient-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    transition: all 0.3s;
}

.review-box:hover { border-color: var(--primary); }

.review-stars { color: #fbbf24; font-size: 0.9rem; margin-bottom: 10px; }
.review-text { font-size: 0.9rem; color: var(--text-main); margin-bottom: 14px; line-height: 1.6; }

.review-author { display: flex; align-items: center; gap: 10px; }
.review-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 0.8rem;
    font-weight: 700;
}

.review-name { font-size: 0.85rem; color: var(--text-bright); }
.review-label { font-size: 0.7rem; color: var(--text-muted); }

/* 联系我们 */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.contact-card {
    background: var(--gradient-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
}

.contact-card h3 { font-size: 1.05rem; color: var(--text-bright); margin-bottom: 16px; }

.contact-row {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 14px;
}

.contact-icon { font-size: 1.2rem; flex-shrink: 0; }
.contact-label { font-size: 0.75rem; color: var(--text-muted); }
.contact-val { font-size: 0.9rem; color: var(--text-main); }

.qr-row { display: flex; gap: 16px; margin-top: 16px; }
.qr-box { text-align: center; }
.qr-box img { width: 100px; height: 100px; border-radius: 8px; margin-bottom: 6px; }
.qr-box span { font-size: 0.7rem; color: var(--text-muted); }

/* 分享栏 */
.share-strip {
    background: var(--bg-section);
    padding: 16px 0;
    border-top: 1px solid var(--border);
}

.share-inner { display: flex; align-items: center; justify-content: center; gap: 12px; flex-wrap: wrap; }
.share-label { font-size: 0.85rem; color: var(--text-muted); }

.share-btn {
    padding: 6px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    color: var(--text-main);
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.3s;
}

.share-btn:hover { border-color: var(--primary); color: var(--accent); }

/* 页脚 */
.site-footer {
    background: #080e1a;
    padding: 48px 0 24px;
    border-top: 1px solid var(--border);
}

.footer-cols {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 32px;
    margin-bottom: 32px;
}

.footer-brand p { font-size: 0.85rem; color: var(--text-muted); margin-top: 12px; line-height: 1.7; }

.footer-col h4 {
    font-size: 0.95rem;
    color: var(--text-bright);
    margin-bottom: 14px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--primary);
    display: inline-block;
}

.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 8px; }
.footer-col a { color: var(--text-muted); font-size: 0.85rem; }
.footer-col a:hover { color: var(--accent); }

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid var(--border);
    font-size: 0.8rem;
    color: var(--text-muted);
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

/* 返回顶部 */
.back-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 44px;
    height: 44px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    cursor: pointer;
    z-index: 999;
    transition: all 0.3s;
    border: none;
}

.back-top.show { display: flex; }
.back-top:hover { background: var(--primary-dark); transform: translateY(-3px); }

/* Toast */
.toast-msg {
    position: fixed;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--bg-card);
    border: 1px solid var(--primary);
    padding: 12px 24px;
    border-radius: 8px;
    color: var(--text-bright);
    font-size: 0.85rem;
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s;
    z-index: 9999;
}

.toast-msg.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* 面包屑 */
.breadcrumb {
    padding: 14px 0;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb span { margin: 0 6px; }

/* 响应式 */
@media (max-width: 768px) {
    .nav-list { display: none; flex-direction: column; position: absolute; top: 68px; left: 0; right: 0; background: var(--bg-dark); padding: 16px; border-bottom: 1px solid var(--border); }
    .nav-list.open { display: flex; }
    .menu-toggle { display: flex; }
    .hero-h1 { font-size: 1.8rem; }
    .hero-nums { gap: 24px; }
    .hero-num-val { font-size: 1.3rem; }
    .feat-card { grid-template-columns: 1fr; }
    .feat-thumb { min-height: 200px; }
    .footer-cols { grid-template-columns: 1fr; }
    .vid-grid { grid-template-columns: 1fr; }
    .hero-area { padding: 48px 0; }
}

@media (max-width: 480px) {
    .hero-h1 { font-size: 1.5rem; }
    .hero-actions { flex-direction: column; align-items: center; }
    .search-box { border-radius: 8px; }
    .search-box button { padding: 12px 16px; }
}