:root{--bg:#f6f7f9;--card:#ffffff;--border:#e2e5ea;--text:#1a1f2b;--muted:#6b7280;--accent:#d97757;--accent-hover:#c4633f;--accent-soft:#fbeee7}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Hiragino Kaku Gothic ProN,Yu Gothic,Meiryo,sans-serif;line-height:1.6}main{max-width:720px;margin:0 auto;padding:48px 20px 80px}.panel{background:var(--card);border:1px solid var(--border);border-top:4px solid var(--accent);border-radius:16px;padding:40px 36px;box-shadow:0 10px 30px rgba(217,119,87,.12)}.page-title{font-size:28px;font-weight:700;margin:0 0 8px;text-align:center}.page-lead{color:var(--muted);margin:0 0 32px;text-align:center}.cards{display:grid;grid-gap:16px;gap:16px;grid-template-columns:1fr}@media (min-width:640px){.cards{grid-template-columns:repeat(2,1fr)}}.card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:20px;cursor:pointer;transition:border-color .15s,box-shadow .15s,transform .05s;-webkit-user-select:none;-moz-user-select:none;user-select:none}.card.selected,.card:hover{border-color:var(--accent)}.card.selected{box-shadow:0 0 0 2px var(--accent-soft)}.card-head{display:flex;align-items:center;justify-content:space-between;gap:8px}.card-name{font-weight:700;font-size:17px}.badge{font-size:12px;padding:2px 8px;border-radius:999px;background:var(--accent-soft);color:var(--accent);white-space:nowrap}.card-amount{font-size:22px;font-weight:700;margin:12px 0 4px}.card-amount .unit{font-size:13px;font-weight:500;color:var(--muted);margin-left:4px}.card-desc{color:var(--muted);font-size:14px;margin:8px 0 0}.checkbox{width:20px;height:20px;border:2px solid var(--border);border-radius:6px;display:inline-flex;align-items:center;justify-content:center;color:#fff;flex-shrink:0}.card.selected .checkbox{background:var(--accent);border-color:var(--accent)}.summary{margin-top:32px;background:var(--card);border:1px solid var(--border);border-radius:14px;padding:20px 24px}.summary-row{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:8px}.summary-total{font-size:20px;font-weight:700;border-top:1px solid var(--border);padding-top:12px;margin-top:4px}.note{color:var(--muted);font-size:13px;margin-top:8px}.pay-button{width:100%;margin-top:20px;padding:14px 20px;font-size:16px;font-weight:700;color:#fff;background:var(--accent);border:none;border-radius:10px;cursor:pointer;transition:background .15s}.pay-button:hover:not(:disabled){background:var(--accent-hover)}.pay-button:disabled{opacity:.5;cursor:not-allowed}.error{color:#b91c1c;background:#fef2f2;border:1px solid #fecaca;border-radius:8px;padding:10px 14px;margin-top:16px;font-size:14px}.center-box{max-width:520px;margin:80px auto;text-align:center;background:var(--card);border:1px solid var(--border);border-radius:16px;padding:40px 32px}.center-box h1{margin:0 0 12px}.center-box p{color:var(--muted);margin:0 0 24px}.link-button{display:inline-block;padding:12px 24px;background:var(--accent);color:#fff;text-decoration:none;border-radius:10px;font-weight:700}