:root{--black:#0a0a0a;--yellow:#ffd000;--white:#fff;--gray:#666;--line:#e5e5e5;--bg:#f6f6f6}
*{box-sizing:border-box}body{margin:0;font-family:Arial,Helvetica,sans-serif;background:var(--bg);color:#111}
a{color:inherit}.top{background:#0a0a0a;color:#fff;padding:14px 18px;position:sticky;top:0;z-index:10}
.top-inner{max-width:1120px;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:14px}
.logo{font-weight:900;font-size:20px;letter-spacing:.4px}.tag{color:#d9d9d9;font-size:11px}
.cart-btn,.btn{border:0;border-radius:8px;background:var(--yellow);color:#111;padding:11px 14px;font-weight:900;cursor:pointer;text-decoration:none;display:inline-block}
.btn.dark{background:#111;color:#fff}.btn.gray{background:#e8e8e8}.wrap{max-width:1120px;margin:22px auto;padding:0 14px}
.hero{background:#111;color:#fff;border-radius:14px;padding:26px;margin-bottom:18px}.hero h1{margin:0 0 7px;font-size:34px}.hero p{margin:0;color:#ddd;line-height:1.45}
.notice{background:#fff3cd;border:1px solid #e3c65a;padding:11px;border-radius:9px;font-size:13px;margin:14px 0}
.grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:14px}
.card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px;display:flex;flex-direction:column}
.card img{width:100%;aspect-ratio:1/1;object-fit:contain;background:#fff;border-radius:8px}.card h2{font-size:16px;margin:10px 0 4px}.muted{color:#666;font-size:12px;line-height:1.4}
.price{font-size:22px;font-weight:900;margin:10px 0}.actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:auto}
.product{display:grid;grid-template-columns:1fr 1fr;gap:28px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px}
.product img{width:100%;aspect-ratio:1/1;object-fit:contain}.product h1{font-size:30px;margin:0 0 10px}.product .price{font-size:30px}
.qty{width:76px;padding:10px;border:1px solid #aaa;border-radius:8px}
.checkout{display:grid;grid-template-columns:1.1fr .9fr;gap:18px}
.panel{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px}
.field{margin:0 0 12px}.field label{display:block;font-size:12px;font-weight:800;margin-bottom:5px}.field input,.field textarea{width:100%;padding:11px;border:1px solid #aaa;border-radius:8px}
.field textarea{min-height:78px}.cart-line{display:grid;grid-template-columns:1fr auto;gap:10px;padding:9px 0;border-bottom:1px solid #eee}.total{display:flex;justify-content:space-between;font-size:20px;font-weight:900;margin-top:14px}
.success{text-align:center;max-width:650px;margin:50px auto;background:#fff;padding:28px;border:1px solid #ddd;border-radius:14px}
.footer{max-width:1120px;margin:30px auto;padding:20px 14px;color:#666;font-size:12px;text-align:center}
@media(max-width:900px){.grid{grid-template-columns:repeat(2,minmax(0,1fr))}.product,.checkout{grid-template-columns:1fr}}
@media(max-width:520px){.grid{grid-template-columns:1fr}.hero h1{font-size:27px}}