:root {
    --bg: #f6f8fb;
    --surface: #ffffff;
    --surface-2: #eef3fb;
    --text: #172033;
    --muted: #667085;
    --primary: #276ef1;
    --primary-dark: #1c54be;
    --border: #d8e1ee;
    --shadow: 0 12px 32px rgba(26, 42, 82, 0.08);
    --radius: 14px;
}

* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(1180px, calc(100% - 32px)); margin: 0 auto; }
.site-header {
    position: sticky; top: 0; z-index: 20;
    background: rgba(246, 248, 251, 0.92); backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(216, 225, 238, 0.8);
}
.header-inner { display: flex; align-items: center; gap: 20px; padding: 16px 0; }
.brand { display: flex; align-items: center; gap: 12px; min-width: 220px; }
.brand-mark {
    width: 44px; height: 44px; border-radius: 12px; background: linear-gradient(135deg, #2d8cff, #7a5cff);
    color: #fff; display: grid; place-items: center; font-weight: 700;
}
.brand strong { display: block; font-size: 16px; }
.brand small { display: block; color: var(--muted); font-size: 12px; }
.main-nav { display: flex; flex-wrap: wrap; gap: 8px; flex: 1; }
.main-nav a { padding: 8px 12px; border-radius: 999px; color: var(--muted); }
.main-nav a.active, .main-nav a:hover { background: var(--surface); color: var(--primary); box-shadow: 0 4px 18px rgba(39,110,241,.08); }
.header-actions { display: flex; gap: 10px; }
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 10px 16px; border-radius: 12px; border: 1px solid transparent; font-weight: 600;
}
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 10px 20px rgba(39,110,241,.18); }
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost { background: var(--surface); border-color: var(--border); }
.hero { padding: 40px 0 24px; }
.hero-grid { display: grid; grid-template-columns: 1.45fr 0.9fr; gap: 22px; align-items: stretch; }
.hero-panel, .card, .info-box, .form-panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.hero-panel { padding: 34px; background: linear-gradient(135deg, #ffffff 0%, #eef4ff 100%); }
.hero h1 { margin: 0 0 14px; font-size: 36px; line-height: 1.15; }
.hero p { margin: 0 0 18px; color: var(--muted); font-size: 16px; }
.hero-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 26px; }
.stat { padding: 14px; border-radius: 12px; background: rgba(255,255,255,.72); border: 1px solid rgba(216,225,238,.75); }
.stat strong { display: block; font-size: 22px; }
.stat span { color: var(--muted); font-size: 13px; }
.side-rail { display: grid; gap: 16px; }
.info-box { padding: 20px; }
.info-box h3, .section-title { margin: 0 0 14px; font-size: 22px; }
.section { padding: 18px 0 30px; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 16px; margin-bottom: 18px; }
.section-head p { margin: 0; color: var(--muted); }
.grid-5, .grid-3, .grid-info { display: grid; gap: 16px; }
.grid-5 { grid-template-columns: repeat(5, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-info { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.card { padding: 18px; }
.card-image {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
    border-radius: 12px;
    margin-bottom: 14px;
    background: var(--surface-2);
}
.card h3, .card h4 { margin: 0 0 8px; }
.muted { color: var(--muted); }
.badge { display: inline-flex; padding: 4px 10px; border-radius: 999px; background: #edf3ff; color: var(--primary); font-size: 12px; font-weight: 700; }
.product-meta { display: flex; justify-content: space-between; gap: 12px; align-items: center; margin-top: 16px; }
.price { color: #d13b3b; font-weight: 800; font-size: 18px; }
.link-arrow { color: var(--primary); font-weight: 700; }
.split-layout { display: grid; grid-template-columns: 1fr 320px; gap: 20px; align-items: start; }
.category-list, .listing-list { display: grid; gap: 14px; }
.listing-item { padding: 16px 18px; border: 1px solid var(--border); border-radius: 14px; background: #fff; }
.listing-item strong { display: block; margin-bottom: 6px; }
.panel { padding: 22px; }
.form-panel { padding: 24px; }
.field { display: grid; gap: 8px; margin-bottom: 14px; }
.field input, .field select, .field textarea {
    width: 100%; padding: 12px 14px; border-radius: 12px; border: 1px solid var(--border); font: inherit; background: #fff;
}
.notice { padding: 14px 16px; background: #f3f8ff; border: 1px solid #d7e6ff; border-radius: 12px; color: #2457b2; }
.footer-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 20px; padding: 26px 0 34px; }
.site-footer { margin-top: 36px; border-top: 1px solid var(--border); background: #fff; }
.page-title { margin: 0 0 10px; font-size: 30px; }
.breadcrumb { color: var(--muted); margin-bottom: 10px; }
.detail-hero { padding: 28px 0 20px; }
.detail-grid { display: grid; grid-template-columns: 1.25fr 0.75fr; gap: 20px; }
.detail-card { padding: 24px; }
.merchant-box { padding: 20px; background: #f9fbff; border: 1px solid var(--border); border-radius: 14px; }
.tag-list { display: flex; flex-wrap: wrap; gap: 8px; }
.tag { padding: 6px 10px; border-radius: 999px; background: #eef2ff; color: #4654be; font-size: 12px; }
.product-photo {
    width: 100%;
    aspect-ratio: 16 / 10;
    object-fit: cover;
    margin-bottom: 18px;
    border-radius: 14px;
    background: var(--surface-2);
}
.product-specs {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    margin: 18px 0;
}
.product-specs div {
    padding: 14px;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: #fbfdff;
}
.product-specs strong {
    display: block;
    margin-bottom: 6px;
    color: var(--muted);
    font-size: 13px;
}
.product-specs span { font-weight: 700; }

@media (max-width: 1080px) {
    .hero-grid, .split-layout, .detail-grid, .grid-5, .grid-3, .grid-info { grid-template-columns: 1fr 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
}
@media (max-width: 760px) {
    .header-inner, .section-head { flex-direction: column; align-items: flex-start; }
    .brand { min-width: 0; }
    .main-nav { width: 100%; }
    .header-actions { width: 100%; }
    .header-actions .btn { flex: 1; }
    .hero-grid, .split-layout, .detail-grid, .grid-5, .grid-3, .grid-info { grid-template-columns: 1fr; }
    .product-specs { grid-template-columns: 1fr; }
    .hero h1 { font-size: 28px; }
    .container { width: min(100% - 20px, 1180px); }
}