:root{color-scheme:light dark;font-family:system-ui,-apple-system,Segoe UI,sans-serif}*{box-sizing:border-box}body{margin:0;background:#f4f5f7}.app{max-width:520px;margin:0 auto;min-height:100vh;background:#fff;padding:12px 16px 32px}.topbar{display:flex;align-items:center;gap:10px;padding:8px 0;position:sticky;top:0;background:#fff;border-bottom:1px solid #e5e7eb;margin-bottom:12px}.topbar .back{background:transparent;border:none;font-size:20px;cursor:pointer}.topbar span{font-weight:600}.banner{border-radius:8px;padding:10px 12px;margin:8px 0;display:flex;justify-content:space-between;align-items:center;font-size:14px}.banner.error{background:#fee2e2;color:#991b1b}.banner.notice{background:#fff7ed;color:#9a3412}.banner button{background:transparent;border:none;font-size:14px;cursor:pointer}.list{display:flex;flex-direction:column;gap:10px}.card{display:block;width:100%;text-align:left;background:#fff;border:1px solid #e5e7eb;border-radius:10px;padding:12px;cursor:pointer;font:inherit}.card p{margin:4px 0 0;color:#6b7280;font-size:14px}.card.row{display:flex;justify-content:space-between;align-items:center;gap:10px}.screen{padding:24px 8px;text-align:left}.screen.center{text-align:center}h1{margin-top:0}h2{margin:12px 0 8px}.price{color:#111827;font-weight:600;white-space:nowrap}.muted{color:#6b7280;font-size:13px}.detail{display:flex;flex-direction:column;gap:10px}fieldset{border:1px solid #e5e7eb;border-radius:10px;padding:10px 12px}legend{font-weight:600;padding:0 6px}.option{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:6px 0;cursor:pointer}.option input{margin-right:8px}.primary{display:block;width:100%;margin-top:14px;padding:12px;background:#16a34a;color:#fff;border:none;border-radius:10px;font-size:16px;font-weight:600;cursor:pointer}.primary:disabled{opacity:.6}.link{background:transparent;border:none;color:#dc2626;cursor:pointer;padding:4px 0;font-size:13px}.qty{display:flex;align-items:center;gap:10px}.qty button{width:28px;height:28px;border-radius:6px;border:1px solid #d1d5db;background:#fff;cursor:pointer}.row.between{display:flex;justify-content:space-between;align-items:center;margin-top:8px}.total{font-weight:600;margin:12px 0}.type-picker{display:flex;gap:8px;margin-bottom:12px}.type-picker button{flex:1;padding:10px;border-radius:8px;border:1px solid #d1d5db;background:#fff;cursor:pointer}.type-picker button.selected{background:#dcfce7;border-color:#16a34a}label{display:block;margin:10px 0;font-size:14px}label input{display:block;width:100%;margin-top:4px;padding:10px;border:1px solid #d1d5db;border-radius:8px;font-size:15px}.steps{margin:16px 0}.step{padding:8px 12px;border-left:3px solid #d1d5db;color:#9ca3af}.step.done{border-left-color:#16a34a;color:#111827;font-weight:600}