:root{--bg:#f7f5f2;--surface:#fff;--border:#e6e1da;--text:#1f2933;--muted:#6b7280;--primary:#7c3f1d;--primary-hover:#613014;--accent:#c98a3e;--radius:12px;--shadow:0 1px 3px rgba(0,0,0,.06),0 8px 24px rgba(0,0,0,.04)}*{box-sizing:border-box}body,html{margin:0;padding:0}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Sarabun,Roboto,Helvetica Neue,Arial,sans-serif;line-height:1.6}a{color:inherit;text-decoration:none}.container{max-width:1100px;margin:0 auto;padding:0 20px}.site-header{position:-webkit-sticky;position:sticky;top:0;z-index:10;background:hsla(0,0%,100%,.9);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--border)}.site-header .inner{display:flex;align-items:center;justify-content:space-between;height:64px}.brand{font-size:1.35rem;font-weight:800;letter-spacing:-.02em;color:var(--primary)}.cart-link{position:relative;gap:8px;padding:8px 16px;border:1px solid var(--border);background:var(--surface);font-weight:600}.cart-badge,.cart-link{display:inline-flex;align-items:center;border-radius:999px}.cart-badge{min-width:20px;height:20px;padding:0 6px;background:var(--primary);color:#fff;font-size:.75rem;font-weight:700;justify-content:center}.hero{padding:48px 0 24px}.hero h1{font-size:2.4rem;margin:0 0 8px;letter-spacing:-.03em}.hero p{color:var(--muted);margin:0;font-size:1.1rem}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));grid-gap:24px;gap:24px;padding:24px 0 64px}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .15s ease,box-shadow .15s ease;display:flex;flex-direction:column}.card:hover{transform:translateY(-3px);box-shadow:0 6px 12px rgba(0,0,0,.08),0 16px 40px rgba(0,0,0,.06)}.card .cover{aspect-ratio:2/3;width:100%;object-fit:cover;background:#eee;display:block}.card .body{padding:14px 16px 18px;display:flex;flex-direction:column;gap:4px;flex:1 1}.card .title{font-weight:700;font-size:1rem;line-height:1.35}.card .author{color:var(--muted);font-size:.85rem}.card .price{margin-top:auto;padding-top:8px;font-weight:800;color:var(--primary);font-size:1.05rem}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 18px;border-radius:10px;border:1px solid transparent;font-weight:700;font-size:.95rem;cursor:pointer;transition:background .15s ease,opacity .15s ease}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-hover)}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.btn-outline{background:var(--surface);border-color:var(--border);color:var(--text)}.btn-outline:hover{border-color:var(--muted)}.detail{display:grid;grid-template-columns:320px 1fr;grid-gap:40px;gap:40px;padding:40px 0 64px}.detail .cover{width:100%;border-radius:var(--radius);box-shadow:var(--shadow)}.detail h1{margin:0 0 4px;font-size:2rem;letter-spacing:-.02em}.detail .author{color:var(--muted);font-size:1.1rem;margin-bottom:16px}.detail .price{font-size:1.8rem;font-weight:800;color:var(--primary);margin:16px 0}.detail .desc{color:#374151;margin-bottom:24px}.stock{font-size:.9rem;color:var(--muted);margin-bottom:16px}.stock.out{color:#b91c1c;font-weight:700}.cart-list{display:flex;flex-direction:column;gap:16px;padding:24px 0}.cart-row{display:grid;grid-template-columns:64px 1fr auto auto;grid-gap:16px;gap:16px;align-items:center;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:12px 16px}.cart-row img{width:64px;height:90px;object-fit:cover;border-radius:6px}.qty{display:inline-flex;align-items:center;border:1px solid var(--border);border-radius:8px;overflow:hidden}.qty button{width:32px;height:32px;border:none;background:var(--surface);cursor:pointer;font-size:1.1rem}.qty span{width:40px;text-align:center}.link-muted{color:var(--muted);cursor:pointer;background:none;border:none;font-size:.85rem;text-decoration:underline}.two-col{display:grid;grid-template-columns:1fr 360px;grid-gap:32px;gap:32px;align-items:start;padding-bottom:64px}.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}.panel h2{margin:0 0 16px;font-size:1.25rem}.summary-row{display:flex;justify-content:space-between;padding:6px 0}.summary-row.total{border-top:1px solid var(--border);margin-top:8px;padding-top:12px;font-weight:800;font-size:1.2rem}.field{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}.field label{font-size:.85rem;font-weight:600;color:var(--muted)}.field input,.field textarea{padding:10px 12px;border:1px solid var(--border);border-radius:8px;font-family:inherit;font-size:.95rem;background:var(--bg)}.field input:focus,.field textarea:focus{outline:2px solid var(--accent);outline-offset:-1px}.empty{text-align:center;padding:80px 20px;color:var(--muted)}.notice{padding:12px 16px;border-radius:8px;margin:16px 0;font-weight:600}.notice.error{background:#fee2e2;color:#991b1b}.notice.success{background:#dcfce7;color:#166534}.back-link{display:inline-block;color:var(--muted);margin:24px 0 0;font-weight:600}@media (max-width:720px){.detail{grid-template-columns:1fr}.detail .cover{max-width:240px}.two-col{grid-template-columns:1fr}}