* { box-sizing: border-box; }
body { margin:0; font-family:"Segoe UI","Microsoft YaHei",Arial,sans-serif; background:#f6f7f9; color:#222; }
.wrap { max-width:1100px; margin:0 auto; padding:0 16px; }
.topbar { background:#0f172a; color:#fff; padding:12px 0; position:sticky; top:0; z-index:50; }
.nav { display:flex; align-items:center; gap:18px; }
.brand { font-weight:800; font-size:20px; color:#fff; text-decoration:none; }
.nav nav { display:flex; gap:14px; flex:1; }
.nav nav a { color:#cbd5e1; text-decoration:none; font-size:14px; }
.nav nav a:hover { color:#fff; }
.right { display:flex; align-items:center; gap:10px; margin-left:auto; }
.lang a { color:#94a3b8; margin-left:6px; font-size:13px; text-decoration:none; }
.lang a.on { color:#fbbf24; font-weight:700; }
.btn { display:inline-block; background:#2563eb; color:#fff; border:none; padding:8px 16px; border-radius:6px; cursor:pointer; font-size:14px; text-decoration:none; }
.btn:hover { background:#1d4ed8; }
.btn.ghost { background:transparent; color:#2563eb; border:1px solid #2563eb; }
.btn.small { padding:5px 10px; font-size:12px; }
.btn.big { padding:12px 24px; font-size:16px; }
.btn.primary { background:#16a34a; }
.topbar .btn.ghost { color:#cbd5e1; border-color:#475569; }
.hero { background:linear-gradient(120deg,#1e3a8a,#3b82f6); color:#fff; padding:70px 0; text-align:center; }
.slogan { font-size:18px; opacity:.9; }
.hero h1 { font-size:40px; margin:0 0 10px; }
.page { padding:28px 0 60px; }
.narrow { max-width:460px; }
h1 { font-size:26px; }
.grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(230px,1fr)); gap:18px; margin-top:18px; }
.card { background:#fff; border-radius:10px; overflow:hidden; text-decoration:none; color:inherit; border:1px solid #e5e7eb; transition:.15s; }
.card:hover { transform:translateY(-3px); box-shadow:0 8px 20px rgba(0,0,0,.08); }
.card img { width:100%; height:180px; object-fit:cover; display:block; }
.card-body { padding:12px; }
.card h3 { margin:0 0 6px; font-size:15px; }
.price { color:#ef4444; font-weight:700; }
.price.big { font-size:22px; }
.slider { position:relative; margin:24px 0; border-radius:12px; overflow:hidden; }
.slide { min-width:100%; display:none; }
.slide img { width:100%; height:320px; object-fit:cover; }
.cap { position:absolute; bottom:14px; left:18px; background:rgba(0,0,0,.55); color:#fff; padding:6px 14px; border-radius:8px; }
.slider-prev,.slider-next { position:absolute; top:50%; transform:translateY(-50%); background:rgba(0,0,0,.4); color:#fff; border:none; font-size:28px; width:40px; height:40px; border-radius:50%; cursor:pointer; }
.slider-prev{left:10px} .slider-next{right:10px}
.cats { display:flex; gap:8px; flex-wrap:wrap; margin:14px 0; }
.chip { padding:6px 14px; background:#e2e8f0; border-radius:999px; text-decoration:none; color:#334155; font-size:13px; }
.chip.on { background:#2563eb; color:#fff; }
.detail-grid { display:grid; grid-template-columns:1fr 1fr; gap:30px; }
.main-img { width:100%; border-radius:12px; }
.qty-row,.actions { margin-top:16px; display:flex; gap:12px; align-items:center; }
.qty-row input { width:70px; padding:6px; }
.tbl { width:100%; border-collapse:collapse; background:#fff; border-radius:8px; overflow:hidden; margin-top:14px; }
.tbl th,.tbl td { border-bottom:1px solid #eef; padding:9px 10px; text-align:left; font-size:14px; }
.tbl th { background:#f1f5f9; }
.inline { display:inline; margin-right:6px; }
.err { color:#dc2626; background:#fee2e2; padding:8px 12px; border-radius:6px; }
.ok { color:#16a34a; background:#dcfce7; padding:8px 12px; border-radius:6px; }
.footer { background:#0f172a; color:#94a3b8; padding:24px 0; margin-top:40px; text-align:center; font-size:13px; }
label { display:block; margin:10px 0 4px; font-size:13px; color:#475569; }
input,select,textarea { width:100%; padding:9px 10px; border:1px solid #cbd5e1; border-radius:6px; font-size:14px; }
.cart-item { display:flex; gap:14px; align-items:center; background:#fff; padding:12px; border-radius:8px; margin-bottom:10px; border:1px solid #e2e8f0; }
.cart-item img { width:70px; height:70px; object-fit:cover; border-radius:6px; }
.cart-foot { margin-top:16px; text-align:right; }
.cart-foot p { font-size:18px; }
.empty { color:#64748b; text-align:center; padding:40px 0; }

/* ── H5 移动端自适应 ── */
@media (max-width: 768px) {
    .nav { flex-wrap: wrap; gap: 8px; }
    .nav nav { order: 3; width: 100%; overflow-x: auto; gap: 12px; padding-bottom: 4px; }
    .brand { font-size: 17px; }
    .right { margin-left: auto; }
    .right .btn { padding: 6px 10px; font-size: 12px; }
    .lang { display: flex; flex-wrap: wrap; }
    .lang a { margin-left: 4px; font-size: 11px; }
    .hero { padding: 40px 0; }
    .hero h1 { font-size: 24px; }
    .slogan { font-size: 14px; }
    .page { padding: 16px 0 40px; }
    h1 { font-size: 20px; }
    .grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .card img { height: 130px; }
    .card h3 { font-size: 13px; }
    .price.big { font-size: 18px; }
    .slide img { height: 180px; }
    .detail-grid { grid-template-columns: 1fr; gap: 16px; }
    .main-img { height: auto; }
    .qty-row, .actions { flex-wrap: wrap; }
    .tbl { font-size: 12px; }
    .tbl th, .tbl td { padding: 6px 4px; }
    .cart-item { flex-wrap: wrap; }
    .btn.big { padding: 10px 18px; font-size: 14px; }
}
@media (max-width: 420px) {
    .grid { grid-template-columns: 1fr; }
    .card img { height: 160px; }
    .hero h1 { font-size: 20px; }
}
/* ── 登录/注册 UI ── */
.auth-wrap { display:flex; justify-content:center; align-items:flex-start; padding:24px 0; }
.auth-card { width:100%; max-width:420px; background:#fff; border-radius:16px; box-shadow:0 10px 30px rgba(15,23,42,.08); padding:32px 28px; border:1px solid #e2e8f0; }
.auth-head { text-align:center; margin-bottom:22px; }
.auth-logo { font-size:44px; display:block; margin-bottom:8px; }
.auth-head h1 { margin:0 0 6px; font-size:24px; }
.auth-sub { color:#64748b; font-size:14px; margin:0; }
.auth-form label { margin-top:14px; }
.auth-form input { transition:.15s; }
.auth-form input:focus { border-color:#2563eb; box-shadow:0 0 0 3px rgba(37,99,235,.12); outline:none; }
.btn-block { width:100%; margin-top:20px; }
.auth-foot { text-align:center; margin-top:18px; font-size:14px; color:#64748b; }
.auth-foot a { color:#2563eb; text-decoration:none; font-weight:600; }
@media (max-width: 768px) {
    .auth-card { padding:24px 18px; border-radius:12px; }
    .auth-logo { font-size:36px; }
}