/* 国产一区 - 汽车改装视频社区 原创样式 */
/* 配色方案：深蓝黑 #191E2D + 赛车橙 #FF781E + 银灰 #E8ECF0 */

:root {
    --primary: #191E2D;
    --accent: #FF781E;
    --accent-dark: #D4600A;
    --silver: #E8ECF0;
    --dark-gray: #2A3042;
    --text: #333340;
    --text-light: #6B7280;
    --bg: #F7F8FA;
    --card-bg: #FFFFFF;
    --radius: 12px;
    --shadow: 0 4px 20px rgba(25,30,45,0.08);
    --shadow-hover: 0 8px 32px rgba(255,120,30,0.15);
    --transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
}

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

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.7;
    overflow-x: hidden;
}

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

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

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

/* ===== 头部导航 ===== */
.site-header {
    background: var(--primary);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 12px rgba(0,0,0,0.3);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.site-logo { display: flex; align-items: center; gap: 12px; }
.site-logo img { height: 42px; width: auto; }
.site-logo .brand-name {
    font-size: 22px;
    font-weight: 700;
    color: #fff;
    letter-spacing: 1px;
}
.site-logo .brand-name span { color: var(--accent); }

.main-nav { display: flex; gap: 4px; }
.main-nav a {
    color: #cdd3de;
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 15px;
    font-weight: 500;
    transition: var(--transition);
}
.main-nav a:hover, .main-nav a.active {
    color: #fff;
    background: rgba(255,120,30,0.15);
}

.mobile-toggle { display: none; color: #fff; font-size: 24px; cursor: pointer; background: none; border: none; }

/* ===== 搜索栏 ===== */
.search-bar {
    background: var(--dark-gray);
    padding: 12px 0;
    border-bottom: 1px solid rgba(255,120,30,0.2);
}
.search-bar .container { display: flex; justify-content: center; }
.search-box {
    display: flex;
    max-width: 600px;
    width: 100%;
    background: rgba(255,255,255,0.08);
    border-radius: 30px;
    overflow: hidden;
    border: 1px solid rgba(255,120,30,0.3);
}
.search-box input {
    flex: 1;
    padding: 10px 20px;
    background: transparent;
    border: none;
    color: #fff;
    font-size: 14px;
    outline: none;
}
.search-box input::placeholder { color: #8892a4; }
.search-box button {
    padding: 10px 24px;
    background: var(--accent);
    border: none;
    color: #fff;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}
.search-box button:hover { background: var(--accent-dark); }

/* ===== Hero Banner ===== */
.hero-section {
    background: linear-gradient(135deg, var(--primary) 0%, var(--dark-gray) 100%);
    padding: 80px 0 60px;
    position: relative;
    overflow: hidden;
}
.hero-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(255,120,30,0.1) 0%, transparent 70%);
    border-radius: 50%;
}
.hero-content { position: relative; z-index: 2; text-align: center; }
.hero-content h1 {
    font-size: 42px;
    color: #fff;
    margin-bottom: 16px;
    line-height: 1.3;
}
.hero-content h1 span { color: var(--accent); }
.hero-content p {
    font-size: 18px;
    color: #a0aab8;
    max-width: 700px;
    margin: 0 auto 30px;
}
.hero-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn-primary {
    display: inline-block;
    padding: 14px 32px;
    background: var(--accent);
    color: #fff;
    border-radius: 30px;
    font-weight: 600;
    font-size: 16px;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}
.btn-primary:hover { background: var(--accent-dark); transform: translateY(-2px); box-shadow: var(--shadow-hover); color: #fff; }
.btn-outline {
    display: inline-block;
    padding: 14px 32px;
    border: 2px solid var(--accent);
    color: var(--accent);
    border-radius: 30px;
    font-weight: 600;
    font-size: 16px;
    transition: var(--transition);
}
.btn-outline:hover { background: var(--accent); color: #fff; }

/* ===== 通用Section ===== */
.section { padding: 70px 0; }
.section-title {
    text-align: center;
    margin-bottom: 50px;
}
.section-title h2 {
    font-size: 32px;
    color: var(--primary);
    margin-bottom: 12px;
    position: relative;
    display: inline-block;
}
.section-title h2::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 3px;
    background: var(--accent);
    border-radius: 2px;
}
.section-title p { color: var(--text-light); font-size: 16px; margin-top: 16px; }

/* ===== 视频卡片 ===== */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}
.video-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
}
.video-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.video-thumb {
    position: relative;
    padding-top: 56.25%;
    background: var(--dark-gray);
    overflow: hidden;
}
.video-thumb img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}
.video-card:hover .video-thumb img { transform: scale(1.05); }
.play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.8);
    width: 56px;
    height: 56px;
    background: rgba(255,120,30,0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}
.play-btn::after {
    content: '';
    width: 0;
    height: 0;
    border-left: 18px solid #fff;
    border-top: 11px solid transparent;
    border-bottom: 11px solid transparent;
    margin-left: 4px;
}
.video-card:hover .play-btn { opacity: 1; transform: translate(-50%, -50%) scale(1); }
.video-info { padding: 16px; }
.video-info h3 { font-size: 15px; color: var(--text); margin-bottom: 8px; line-height: 1.5; }
.video-meta { display: flex; gap: 12px; font-size: 12px; color: var(--text-light); }
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-duration {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background: rgba(0,0,0,0.75);
    color: #fff;
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 12px;
}

/* ===== 分类标签 ===== */
.category-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    flex-wrap: wrap;
    justify-content: center;
}
.category-tabs .tab {
    padding: 8px 20px;
    background: var(--silver);
    border-radius: 20px;
    font-size: 14px;
    color: var(--text);
    cursor: pointer;
    transition: var(--transition);
    border: none;
}
.category-tabs .tab:hover, .category-tabs .tab.active {
    background: var(--accent);
    color: #fff;
}

/* ===== 专家卡片 ===== */
.expert-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 24px; }
.expert-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 30px 20px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}
.expert-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.expert-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    margin: 0 auto 16px;
    background: var(--silver);
    overflow: hidden;
    border: 3px solid var(--accent);
}
.expert-card h4 { font-size: 17px; color: var(--primary); margin-bottom: 6px; }
.expert-card .role { font-size: 13px; color: var(--accent); margin-bottom: 12px; }
.expert-card p { font-size: 13px; color: var(--text-light); line-height: 1.6; }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
    background: var(--card-bg);
    border-radius: var(--radius);
    margin-bottom: 12px;
    box-shadow: var(--shadow);
    overflow: hidden;
}
.faq-question {
    padding: 18px 24px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}
.faq-question:hover { color: var(--accent); }
.faq-question::after { content: '+'; font-size: 20px; color: var(--accent); transition: var(--transition); }
.faq-item.active .faq-question::after { content: '-'; }
.faq-answer {
    padding: 0 24px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
    color: var(--text-light);
    line-height: 1.8;
}
.faq-item.active .faq-answer { max-height: 300px; padding: 0 24px 18px; }

/* ===== 用户评论 ===== */
.review-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 20px; }
.review-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    border-left: 4px solid var(--accent);
}
.review-card .stars { color: var(--accent); margin-bottom: 10px; font-size: 14px; }
.review-card p { font-size: 14px; color: var(--text); line-height: 1.7; margin-bottom: 12px; }
.review-card .reviewer { font-size: 13px; color: var(--text-light); font-style: italic; }

/* ===== 数据统计 ===== */
.stats-section {
    background: linear-gradient(135deg, var(--primary), var(--dark-gray));
    padding: 60px 0;
    color: #fff;
}
.stats-grid { display: flex; justify-content: space-around; flex-wrap: wrap; gap: 30px; text-align: center; }
.stat-item .stat-num { font-size: 42px; font-weight: 700; color: var(--accent); }
.stat-item .stat-label { font-size: 14px; color: #a0aab8; margin-top: 6px; }

/* ===== 合作品牌 ===== */
.brand-wall { display: flex; flex-wrap: wrap; justify-content: center; gap: 30px; align-items: center; }
.brand-wall .brand-item {
    width: 120px;
    height: 60px;
    background: var(--card-bg);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow);
    font-weight: 600;
    color: var(--text-light);
    font-size: 13px;
}

/* ===== 联系我们 ===== */
.contact-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 24px; }
.contact-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    text-align: center;
    box-shadow: var(--shadow);
}
.contact-card h4 { color: var(--primary); margin-bottom: 10px; }
.contact-card p { font-size: 14px; color: var(--text-light); line-height: 1.8; }

/* ===== 底部 ===== */
.site-footer {
    background: var(--primary);
    color: #a0aab8;
    padding: 60px 0 30px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}
.footer-brand .logo-text {
    font-size: 24px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 12px;
}
.footer-brand .logo-text span { color: var(--accent); }
.footer-brand p { font-size: 13px; line-height: 1.8; margin-bottom: 16px; }
.footer-col h4 { color: #fff; font-size: 16px; margin-bottom: 16px; }
.footer-col a { display: block; color: #8892a4; font-size: 14px; padding: 4px 0; transition: var(--transition); }
.footer-col a:hover { color: var(--accent); padding-left: 4px; }
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.08);
    padding-top: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 13px;
}
.footer-links { display: flex; gap: 20px; }
.footer-links a { color: #8892a4; font-size: 13px; }
.footer-links a:hover { color: var(--accent); }

.share-bar { display: flex; gap: 8px; flex-wrap: wrap; }
.share-btn {
    padding: 6px 14px;
    border-radius: 4px;
    font-size: 12px;
    border: none;
    cursor: pointer;
    color: #fff;
    transition: var(--transition);
}
.share-wechat { background: #07C160; }
.share-weibo { background: #E6162D; }
.share-douyin { background: #111; }
.share-bili { background: #00A1D6; }
.share-btn:hover { opacity: 0.85; transform: translateY(-1px); }

/* ===== QR Code ===== */
.qr-group { display: flex; gap: 16px; }
.qr-item { text-align: center; }
.qr-item img { width: 80px; height: 80px; border-radius: 6px; background: #fff; }
.qr-item span { display: block; font-size: 11px; margin-top: 4px; color: #8892a4; }

/* ===== 干扰标签隐藏 ===== */
.d0pz76h-noise { display: none !important; visibility: hidden !important; height: 0 !important; width: 0 !important; overflow: hidden !important; position: absolute !important; left: -9999px !important; }

/* ===== 响应式 ===== */
@media (max-width: 992px) {
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .hero-content h1 { font-size: 32px; }
}

@media (max-width: 768px) {
    .main-nav { display: none; position: absolute; top: 70px; left: 0; right: 0; background: var(--primary); flex-direction: column; padding: 20px; gap: 8px; box-shadow: 0 4px 12px rgba(0,0,0,0.3); }
    .main-nav.active { display: flex; }
    .mobile-toggle { display: block; }
    .header-inner { height: 60px; }
    .hero-content h1 { font-size: 26px; }
    .hero-content p { font-size: 15px; }
    .section { padding: 50px 0; }
    .section-title h2 { font-size: 24px; }
    .video-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
    .footer-grid { grid-template-columns: 1fr; gap: 30px; }
    .stats-grid { gap: 20px; }
    .stat-item .stat-num { font-size: 32px; }
}

@media (max-width: 480px) {
    .hero-btns { flex-direction: column; align-items: center; }
    .video-grid { grid-template-columns: 1fr; }
    .search-box { margin: 0 10px; }
}

/* 时效性标记样式 */
.update-badge {
    display: inline-block;
    background: linear-gradient(90deg, #FF781E, #FF9A4E);
    color: #fff;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
    margin: 8px 0;
    letter-spacing: 0.5px;
}

/* 专家认证标记 */
.expert-cert {
    font-size: 12px;
    color: #FF781E;
    font-weight: 500;
    margin: 5px 0;
    padding: 4px 0;
    border-bottom: 1px dashed rgba(255,120,30,0.3);
}

/* 联系卡片网格 */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}
.contact-card {
    background: #fff;
    border-radius: 12px;
    padding: 28px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.06);
    transition: transform 0.3s ease;
}
.contact-card:hover {
    transform: translateY(-4px);
}
.contact-card h4 {
    color: var(--racing-orange);
    margin-bottom: 12px;
}