/* ===== 基础 ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
    --primary: #1a1a2e;
    --accent: #0066ff;
    --gold: #f5b342;
    --text: #1a1a1a;
    --text-gray: #666;
    --bg: #f7f7f9;
    --radius: 16px;
}
body {
    font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ===== 按钮 ===== */
.btn { display: inline-block; padding: 12px 28px; border-radius: 60px; font-size: 15px; font-weight: 600; cursor: pointer; border: none; transition: .2s; text-align: center; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: #2a2a4e; }
.btn-ghost { background: transparent; color: #fff; }
.btn-ghost:hover { color: var(--gold); }
.btn-outline { background: transparent; border: 2px solid var(--primary); color: var(--primary); }
.btn-sm { padding: 8px 20px; font-size: 14px; }

/* ===== 顶部导航 ===== */
.site-header { position: sticky; top: 0; z-index: 100; background: rgba(255,255,255,.95); backdrop-filter: blur(10px); border-bottom: 1px solid #eee; }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: flex; align-items: center; gap: 8px; font-weight: 800; font-size: 20px; }
.logo-icon { color: var(--accent); font-size: 24px; }
.main-nav { display: flex; gap: 32px; }
.main-nav a { font-size: 15px; color: var(--text-gray); font-weight: 500; transition: .2s; }
.main-nav a:hover, .main-nav a.active { color: var(--primary); }
.header-actions { display: flex; align-items: center; gap: 12px; }
.menu-toggle { display: none; background: none; border: none; font-size: 24px; cursor: pointer; }

/* ===== Hero 轮播 ===== */
.hero { position: relative; min-height: 620px; display: flex; align-items: center; color: #fff; overflow: hidden; background: #0a0a14; }
.hero-slides { position: absolute; inset: 0; z-index: 0; }
.hero-slide { position: absolute; inset: 0; background-size: cover; background-position: center; opacity: 0; transition: opacity 1s ease; transform: scale(1.05); }
.hero-slide.active { opacity: 1; transform: scale(1); transition: opacity 1s ease, transform 6s ease; }
.hero-overlay { position: absolute; inset: 0; background: linear-gradient(135deg, rgba(10,10,20,.85) 0%, rgba(10,10,20,.5) 50%, rgba(10,10,20,.7) 100%); z-index: 1; }
.hero-content { position: relative; z-index: 2; max-width: 640px; }
.hero-eyebrow { font-size: 14px; color: var(--gold); letter-spacing: 3px; margin-bottom: 16px; }
.hero-title { font-size: 64px; font-weight: 800; line-height: 1.1; letter-spacing: -1px; }
.gradient-text { background: linear-gradient(to right, #f5b342, #e8a317); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-desc { margin-top: 24px; font-size: 17px; color: rgba(255,255,255,.75); max-width: 520px; }
.hero-actions { margin-top: 36px; display: flex; gap: 16px; }
.hero-dots { position: absolute; bottom: 32px; left: 50%; transform: translateX(-50%); display: flex; gap: 10px; z-index: 3; }
.hero-dot { width: 32px; height: 4px; border-radius: 4px; background: rgba(255,255,255,.35); cursor: pointer; transition: .3s; }
.hero-dot.active { background: var(--gold); width: 48px; }

/* ===== 通用区块 ===== */
.section { padding: 80px 0; }
.section-dark { background: var(--primary); color: #fff; }
.section-header { display: flex; justify-content: space-between; align-items: end; margin-bottom: 40px; }
.section-title { font-size: 36px; font-weight: 800; }
.section-title.light { color: #fff; }
.section-more { color: var(--accent); font-weight: 600; }
.section-sub { color: var(--text-gray); margin-top: 8px; }
.section-eyebrow { color: var(--gold); font-size: 13px; letter-spacing: 3px; margin-bottom: 12px; }

/* ===== 车型网格 ===== */
.car-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 24px; }
.car-card { background: #fff; border-radius: var(--radius); overflow: hidden; box-shadow: 0 4px 20px rgba(0,0,0,.05); transition: .3s; }
.car-card:hover { transform: translateY(-6px); box-shadow: 0 12px 40px rgba(0,0,0,.12); }
.car-card-img { position: relative; aspect-ratio: 16/10; background: #eee; overflow: hidden; }
.car-card-img img { width: 100%; height: 100%; object-fit: cover; transition: .5s; }
.car-card:hover .car-card-img img { transform: scale(1.05); }
.car-badge { position: absolute; top: 12px; left: 12px; background: var(--gold); color: #fff; padding: 4px 12px; border-radius: 30px; font-size: 12px; font-weight: 600; }
.car-card-body { padding: 20px; }
.car-card-body h3 { font-size: 20px; font-weight: 700; }
.car-price { color: var(--accent); font-weight: 700; margin-top: 6px; }
.car-desc { color: var(--text-gray); font-size: 14px; margin-top: 10px; }
.car-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 14px; }
.tag { background: #f0f0f5; color: var(--text-gray); font-size: 12px; padding: 3px 10px; border-radius: 30px; }

/* ===== 关于 ===== */
.about-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-text p { color: rgba(255,255,255,.7); margin-top: 16px; }
.about-text .btn { margin-top: 28px; }
.about-visual img { border-radius: var(--radius); width: 100%; }

/* ===== APP 区 ===== */
.app-section { background: #fff; }
.app-inner { display: grid; grid-template-columns: 1fr auto; gap: 60px; align-items: center; }
.app-buttons { display: flex; gap: 12px; margin-top: 24px; }
.store-btn { background: var(--primary); color: #fff; padding: 12px 24px; border-radius: 12px; font-size: 14px; font-weight: 600; }
.qrcode-placeholder { width: 120px; height: 120px; background: #eee; border-radius: 12px; display: flex; align-items: center; justify-content: center; color: #999; font-size: 13px; }
.qrcode-placeholder.large { width: 200px; height: 200px; }

/* ===== 页面 Hero ===== */
.page-hero { background: linear-gradient(135deg, #141424 0%, #0a0a14 100%); color: #fff; padding: 80px 0; text-align: center; }
.page-hero h1 { font-size: 44px; font-weight: 800; }
.page-hero p { color: rgba(255,255,255,.6); margin-top: 10px; }

/* ===== 筛选 ===== */
.filter-bar { display: flex; gap: 10px; margin-bottom: 32px; flex-wrap: wrap; }
.filter-btn { padding: 8px 20px; border-radius: 60px; background: #fff; border: 1px solid #ddd; font-size: 14px; transition: .2s; }
.filter-btn:hover, .filter-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ===== 车型详情 ===== */
.car-detail { padding: 40px 0 80px; }
.breadcrumb { font-size: 13px; color: var(--text-gray); margin-bottom: 24px; }
.breadcrumb a:hover { color: var(--accent); }
.car-detail-top { display: grid; grid-template-columns: 1.3fr 1fr; gap: 48px; align-items: start; }
.car-detail-info h1 { font-size: 40px; font-weight: 800; }
.car-detail-price { color: var(--accent); font-size: 24px; font-weight: 700; margin-top: 10px; }
.car-detail-desc { color: var(--text-gray); margin-top: 16px; }
.car-detail-actions { display: flex; gap: 12px; margin-top: 28px; }

/* ===== 轮播 ===== */
.gallery-slider { background: #fff; border-radius: var(--radius); padding: 12px; box-shadow: 0 4px 20px rgba(0,0,0,.05); }
.slider-main { position: relative; aspect-ratio: 16/10; border-radius: 12px; overflow: hidden; background: #eee; }
.slider-img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: 0; transition: opacity .4s; }
.slider-img.active { opacity: 1; }
.slider-arrow { position: absolute; top: 50%; transform: translateY(-50%); width: 40px; height: 40px; border-radius: 50%; background: rgba(0,0,0,.5); color: #fff; border: none; font-size: 24px; cursor: pointer; z-index: 2; display: flex; align-items: center; justify-content: center; }
.slider-arrow:hover { background: rgba(0,0,0,.8); }
.slider-arrow.prev { left: 12px; }
.slider-arrow.next { right: 12px; }
.slider-thumbs { display: flex; gap: 8px; margin-top: 12px; }
.slider-thumb { flex: 1; aspect-ratio: 16/10; border-radius: 8px; overflow: hidden; cursor: pointer; opacity: .5; transition: .2s; border: 2px solid transparent; }
.slider-thumb.active { opacity: 1; border-color: var(--accent); }
.slider-thumb img { width: 100%; height: 100%; object-fit: cover; }

/* ===== 参数表 ===== */
.specs-section { margin-top: 60px; }
.specs-section h2 { font-size: 28px; font-weight: 800; margin-bottom: 24px; }
.specs-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 16px; }
.spec-item { background: #fff; border-radius: 12px; padding: 20px; box-shadow: 0 2px 12px rgba(0,0,0,.04); }
.spec-label { display: block; font-size: 13px; color: var(--text-gray); }
.spec-value { display: block; font-size: 18px; font-weight: 700; margin-top: 6px; color: var(--primary); }

/* ===== 新闻 ===== */
.news-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 24px; }
.news-card { background: #fff; border-radius: var(--radius); overflow: hidden; box-shadow: 0 4px 20px rgba(0,0,0,.05); transition: .3s; }
.news-card:hover { transform: translateY(-4px); box-shadow: 0 12px 30px rgba(0,0,0,.1); }
.news-img { aspect-ratio: 16/9; background: #eee; overflow: hidden; }
.news-img img { width: 100%; height: 100%; object-fit: cover; transition: .5s; }
.news-card:hover .news-img img { transform: scale(1.05); }
.news-body { padding: 20px; }
.news-date { font-size: 13px; color: var(--text-gray); }
.news-body h3 { margin-top: 8px; font-size: 18px; }
.news-body p { color: var(--text-gray); font-size: 14px; margin-top: 8px; }
.empty-tip { text-align: center; color: var(--text-gray); padding: 60px 0; }

/* ===== 关于我们内容 ===== */
.about-content-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-content-text h2 { font-size: 32px; font-weight: 800; margin-bottom: 20px; }
.about-content-text p { color: var(--text-gray); margin-top: 14px; }
.about-content-img img { border-radius: var(--radius); width: 100%; }

/* ===== 数据统计 ===== */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; text-align: center; }
.stat-num { font-size: 40px; font-weight: 800; color: var(--gold); }
.stat-label { color: rgba(255,255,255,.6); margin-top: 8px; font-size: 14px; }

/* ===== 网站地图 ===== */
.sitemap-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 24px; }
.sitemap-block { background: #fff; border-radius: var(--radius); padding: 28px; box-shadow: 0 4px 20px rgba(0,0,0,.05); }
.sitemap-block h3 { font-size: 18px; font-weight: 800; margin-bottom: 16px; padding-bottom: 12px; border-bottom: 2px solid var(--gold); display: inline-block; }
.sitemap-block ul { list-style: none; }
.sitemap-block li { margin-bottom: 10px; }
.sitemap-block a { color: var(--text-gray); font-size: 14px; transition: .2s; }
.sitemap-block a:hover { color: var(--accent); padding-left: 4px; }

/* ===== 页脚 ===== */
.site-footer { background: var(--primary); color: rgba(255,255,255,.7); padding: 60px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; }
.footer-col h4 { color: #fff; margin-bottom: 16px; font-size: 16px; }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 10px; }
.footer-col a:hover { color: var(--gold); }
.footer-desc { margin-top: 12px; font-size: 14px; }
.footer-app { font-size: 14px; }
.footer-app span { color: var(--gold); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); margin-top: 40px; padding-top: 24px; text-align: center; font-size: 13px; }

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .main-nav { display: none; }
    .main-nav.open { display: flex; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: #fff; padding: 20px; gap: 16px; box-shadow: 0 10px 30px rgba(0,0,0,.1); }
    .menu-toggle { display: block; }
    .hero-title { font-size: 40px; }
    .section-title { font-size: 28px; }
    .about-inner, .app-inner, .car-detail-top, .about-content-grid { grid-template-columns: 1fr; gap: 32px; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .header-actions .btn { display: none; }
    .stats-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
    .stat-num { font-size: 32px; }
}