:root {
    --store-bg: #F5F5F7;
    --store-card: #FFFFFF;
    --store-blue: #007AFF; /* 商店蓝 */
    --store-blue-hover: #0062CC;
    --text-title: #1D1D1F;
    --text-body: #515154;
    --text-muted: #86868B;
    --border-color: #E5E5EA;
    --star-color: #FF9500;
    --radius-lg: 18px;
    --radius-md: 12px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif; background-color: var(--store-bg); color: var(--text-body); line-height: 1.5; -webkit-font-smoothing: antialiased; }
a { text-decoration: none; color: inherit; transition: 0.2s; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

/* 导航 */
.header { background: rgba(255,255,255,0.85); backdrop-filter: saturate(180%) blur(20px); border-bottom: 1px solid var(--border-color); position: sticky; top: 0; z-index: 1000; }
.nav-wrap { max-width: 1000px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; height: 60px; padding: 0 20px; }
.logo { font-size: 18px; font-weight: 600; color: var(--text-title); display: flex; align-items: center; gap: 8px; }
.logo img { width: 24px; height: 24px; border-radius: 6px; }
.nav-links { display: flex; gap: 30px; }
.nav-links a { font-size: 14px; font-weight: 400; color: var(--text-title); opacity: 0.8; }
.nav-links a:hover, .nav-links a.active { opacity: 1; color: var(--store-blue); }

.container { max-width: 1000px; margin: 0 auto; padding: 40px 20px; }

/* 按钮 */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 8px 24px; border-radius: 30px; font-size: 15px; font-weight: 600; cursor: pointer; transition: 0.3s; }
.btn-primary { background: var(--store-blue); color: #FFF; border: none; }
.btn-primary:hover { background: var(--store-blue-hover); transform: scale(1.02); }
.btn-outline { background: #F5F5F7; color: var(--store-blue); border: none; }
.btn-outline:hover { background: #E5E5EA; }

/* 商店头部 Hero (App详情头部) */
.app-header { display: flex; align-items: flex-start; gap: 30px; margin-bottom: 40px; background: var(--store-card); padding: 40px; border-radius: var(--radius-lg); box-shadow: 0 4px 20px rgba(0,0,0,0.03); border: 1px solid var(--border-color); }
.app-icon { width: 140px; height: 140px; border-radius: 30px; box-shadow: 0 10px 30px rgba(0,0,0,0.1); border: 1px solid rgba(0,0,0,0.05); }
.app-info { flex: 1; }
.app-info h1 { font-size: 36px; font-weight: 700; color: var(--text-title); margin-bottom: 5px; letter-spacing: -0.5px; }
.app-info .dev { font-size: 18px; color: var(--store-blue); font-weight: 500; margin-bottom: 12px; }
.app-info .subtitle { font-size: 16px; color: var(--text-muted); margin-bottom: 20px; }
.app-meta { display: flex; align-items: center; gap: 40px; margin-bottom: 25px; padding-top: 15px; border-top: 1px solid var(--border-color); }
.meta-item { display: flex; flex-direction: column; }
.meta-item .val { font-size: 20px; font-weight: 700; color: var(--text-title); }
.meta-item .lbl { font-size: 12px; color: var(--text-muted); font-weight: 500; text-transform: uppercase; }
.stars { color: var(--star-color); font-size: 16px; letter-spacing: 2px; }
.hero-btns { display: flex; gap: 15px; align-items: center; }
.free-tag { font-size: 12px; color: var(--text-muted); }

/* 截图画廊 */
.gallery-sec { margin-bottom: 50px; }
.sec-title { font-size: 24px; font-weight: 700; color: var(--text-title); margin-bottom: 20px; }
.gallery-wrap { display: flex; gap: 20px; overflow-x: auto; padding-bottom: 20px; scroll-snap-type: x mandatory; }
.gallery-wrap::-webkit-scrollbar { height: 8px; }
.gallery-wrap::-webkit-scrollbar-thumb { background: #D1D1D6; border-radius: 4px; }
.gallery-wrap img { width: 600px; border-radius: var(--radius-md); border: 1px solid var(--border-color); box-shadow: 0 4px 15px rgba(0,0,0,0.05); scroll-snap-align: center; flex-shrink: 0; }

/* 新功能与特性 (核心卖点) */
.whats-new { background: var(--store-card); border-radius: var(--radius-lg); padding: 30px; margin-bottom: 50px; border: 1px solid var(--border-color); }
.whats-new-head { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 20px; }
.version-tag { font-size: 14px; color: var(--text-muted); }
.feature-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 15px; margin-top: 20px; }
.f-box { text-align: center; }
.f-box img { width: 42px; height: 42px; margin: 0 auto 10px; border-radius: 10px; }
.f-box h3 { font-size: 13px; font-weight: 600; color: var(--text-title); margin-bottom: 4px; }
.f-box p { font-size: 12px; color: var(--text-muted); }

/* 功能详情 (App介绍区) */
.desc-sec { margin-bottom: 50px; }
.detail-box { display: flex; align-items: flex-start; gap: 40px; margin-bottom: 40px; padding-bottom: 40px; border-bottom: 1px solid var(--border-color); }
.detail-box:last-child { border-bottom: none; padding-bottom: 0; }
.d-text { flex: 1; }
.d-text h3 { font-size: 20px; font-weight: 700; color: var(--text-title); margin-bottom: 15px; }
.d-text p { font-size: 15px; color: var(--text-body); margin-bottom: 15px; line-height: 1.6; }
.d-data { display: inline-block; font-size: 13px; font-weight: 600; color: var(--store-blue); background: rgba(0, 122, 255, 0.1); padding: 4px 12px; border-radius: 12px; }
.d-visual { flex: 1; }
.d-visual img { border-radius: var(--radius-md); border: 1px solid var(--border-color); }

/* 评价与评分 (数据背书) */
.ratings-sec { margin-bottom: 50px; }
.rating-overview { display: flex; align-items: center; gap: 40px; background: var(--store-card); padding: 40px; border-radius: var(--radius-lg); border: 1px solid var(--border-color); }
.score-big { text-align: center; }
.score-big .num { font-size: 64px; font-weight: 700; color: var(--text-title); line-height: 1; }
.score-big .stars { font-size: 24px; margin: 10px 0; }
.score-big .count { font-size: 14px; color: var(--text-muted); }
.rating-bars { flex: 1; }
.bar-row { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.bar-row span { font-size: 12px; color: var(--text-muted); font-weight: 600; width: 10px; }
.bar-track { flex: 1; height: 6px; background: var(--border-color); border-radius: 3px; overflow: hidden; }
.bar-fill { height: 100%; background: var(--text-body); border-radius: 3px; }

/* 浏览器对比 (App内购/版本对比风格) */
.compare-sec { margin-bottom: 50px; }
.compare-box { background: var(--store-card); border-radius: var(--radius-lg); border: 1px solid var(--border-color); overflow: hidden; }
.compare-table { width: 100%; border-collapse: collapse; text-align: left; }
.compare-table th, .compare-table td { padding: 16px 24px; border-bottom: 1px solid var(--border-color); font-size: 14px; }
.compare-table th { color: var(--text-muted); font-weight: 500; background: #FAFAFA; }
.compare-table .hl { font-weight: 600; color: var(--text-title); }
.compare-table tr:last-child td { border-bottom: none; }

/* 更多版本 (类似开发者其他应用) */
.versions-sec { margin-bottom: 50px; }
.dl-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.dl-card { background: var(--store-card); border: 1px solid var(--border-color); padding: 25px; border-radius: var(--radius-lg); display: flex; flex-direction: column; gap: 15px; }
.dl-card:hover { box-shadow: 0 4px 15px rgba(0,0,0,0.05); }
.dl-icon-row { display: flex; align-items: center; gap: 15px; }
.dl-icon-row img { width: 48px; height: 48px; border-radius: 12px; }
.dl-icon-row h3 { font-size: 16px; font-weight: 600; color: var(--text-title); }
.dl-icon-row .cat { font-size: 12px; color: var(--text-muted); }
.dl-card p { font-size: 13px; color: var(--text-muted); flex: 1; }
.dl-card .btn { width: 100%; padding: 8px 0; }

/* FAQ */
.faq-sec { margin-bottom: 50px; background: var(--store-card); border-radius: var(--radius-lg); padding: 30px; border: 1px solid var(--border-color); }
.faq-grid { display: flex; flex-direction: column; gap: 20px; }
.faq-box h4 { font-size: 15px; font-weight: 600; color: var(--text-title); margin-bottom: 8px; }
.faq-box p { font-size: 14px; color: var(--text-body); line-height: 1.5; }

/* Footer */
.footer { border-top: 1px solid var(--border-color); padding: 30px 20px; text-align: center; color: var(--text-muted); font-size: 12px; }