:root{--bg:#ffffff;--text:#0b0b0b;--muted:#666;--border:#e5e7eb;--primary:#0a7cff;--primary-600:#0465d9;--danger:#d70000;--surface:#f8fafc;--radius:10px;--radius-sm:8px;--shadow:0 4px 14px rgba(0,0,0,0.06)}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif;color:var(--text);background:var(--bg);display:flex;flex-direction:column;min-height:100vh}
.site-header{display:flex;justify-content:space-between;align-items:center;padding:12px 16px;border-bottom:1px solid #eee;position:sticky;top:0;background:#fff;z-index:10}
.brand{font-weight:700;font-size:18px;color:#111}
.nav a,.nav span.user{margin-left:12px;text-decoration:none;color:var(--primary)}
.container{max-width:1100px;margin:0 auto;padding:16px}
main.container{flex:1}
.hero{display:flex;justify-content:space-between;align-items:center;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px;margin-bottom:12px}
.hero h1{margin:0;font-size:20px}
.hero .actions a{margin-left:8px}
.error{padding:12px;background:#ffecec;color:#d70000;border:1px solid #ffcdcd;border-radius:6px}
.catalog-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;gap:10px}
.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
@media(max-width:1024px){.grid{grid-template-columns:repeat(3,1fr)}}
@media(max-width:768px){.grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:480px){.grid{grid-template-columns:repeat(1,1fr)}}
.card{display:block;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;background:#fff;color:#111;text-decoration:none;box-shadow:var(--shadow);transition:transform .1s ease}
.card:hover{transform:translateY(-2px)}
.thumb{height:160px;background:#f6f6f6;background-size:cover;background-position:center}
.info{padding:10px}
.title{font-size:15px;font-weight:600;margin-bottom:6px;color:#111}
.meta{display:flex;justify-content:space-between;color:#666;font-size:12px}
.price{color:var(--danger);font-weight:700}
.site-footer{padding:16px;border-top:1px solid #eee;color:#555;margin-top:auto}
.product-detail{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media(max-width:768px){.product-detail{grid-template-columns:1fr}}
.thumb-large{width:100%;padding-top:60%;background:#f6f6f6;background-size:cover;background-position:center;border:1px solid #eee;border-radius:8px}
.spec-form{display:grid;gap:10px;max-width:360px}
.btn{display:inline-block;background:#f3f4f6;border:1px solid var(--border);color:#111;padding:10px 16px;border-radius:var(--radius-sm);text-decoration:none}
.btn.primary{background:var(--primary);border-color:var(--primary-600);color:#fff}
.btn.danger{background:#ffecec;border-color:#ffcaca;color:#c00000}
.table{width:100%;border-collapse:collapse;border:1px solid #eee}
.table th,.table td{border-bottom:1px solid #eee;padding:10px;text-align:left;font-size:14px}
.cart-actions{display:flex;justify-content:space-between;align-items:center;margin-top:12px}
.search-form{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:10px;margin-bottom:10px}
.search-form input,.search-form select{border:1px solid var(--border);border-radius:var(--radius-sm);padding:10px 12px;width:100%}
.search-form input:focus,.search-form select:focus{outline:none;border-color:var(--primary)}
.search-form textarea{border:1px solid var(--border);border-radius:var(--radius-sm);padding:10px 12px;width:100%}
.search-form textarea:focus{outline:none;border-color:var(--primary)}
.container input[type="text"],.container input[type="number"],.container input[type="file"],.container select,.container textarea{border:1px solid var(--border);border-radius:var(--radius-sm);padding:10px 12px;width:100%;font-size:14px}
.container input:focus,.container select:focus,.container textarea:focus{outline:none;border-color:var(--primary)}
.btn:hover{filter:brightness(0.98)}
.btn:active{transform:translateY(1px)}
.table tbody tr:hover{background:#fafafa}
.store-list ul{list-style:none;padding:0;margin:0}
.store-list li{border:1px solid #eee;padding:10px;border-radius:8px;margin-bottom:8px;display:flex;align-items:center}
.store-name{font-weight:600;margin-left:6px}
.invoice-title{color:#666;margin-left:8px}
.login,.success{max-width:420px;margin:40px auto;border:1px solid #eee;border-radius:10px;padding:16px}
.container ul{list-style:none;padding:0;margin:0}
.container ul li{margin:8px 0}
.site-header .nav a{font-size:14px}
.brand{font-size:18px}
.pagination{display:flex;gap:8px;margin-top:12px}
.pagination a{padding:6px 10px;border:1px solid var(--border);border-radius:8px;text-decoration:none;color:#111}
.pagination .active{background:var(--primary);border-color:var(--primary-600);color:#fff}