:root{color-scheme:dark;--bg: #0f1419;--card: #1a222c;--text: #f4f7fb;--muted: #9aa7b8;--accent: #3dd6c3;--danger: #ff6b6b;--border: #2a3544;font-family:Hiragino Sans,Noto Sans JP,system-ui,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text)}.app{max-width:480px;margin:0 auto;padding:16px 16px 32px}h1{font-size:1.25rem;margin:0 0 8px}h2{font-size:1rem;margin:0 0 8px}p{margin:0 0 12px;color:var(--muted);line-height:1.5}.nav{display:flex;gap:8px;margin-bottom:16px}.nav a,button,.btn{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:1px solid var(--border);background:var(--card);color:var(--text);border-radius:10px;padding:10px 12px;text-decoration:none;font-size:.9rem;cursor:pointer}button.primary,.btn.primary{background:var(--accent);color:#04120f;border-color:transparent;font-weight:600}button:disabled{opacity:.5;cursor:not-allowed}.card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:16px;margin-bottom:12px}.coupon-badge{display:inline-block;padding:4px 8px;border-radius:999px;background:#243041;color:var(--accent);font-size:.75rem;margin-bottom:8px}.qr-wrap{display:flex;justify-content:center;padding:12px;background:#fff;border-radius:12px}.qr-wrap img{display:block;width:220px;height:220px}.store-list{list-style:none;padding:0;margin:0}.store-list li{border-bottom:1px solid var(--border);padding:12px 0}.store-list li:last-child{border-bottom:none}.store-name{font-weight:600}.store-meta{color:var(--muted);font-size:.85rem}.error{color:var(--danger);margin-top:8px}.status-ok{color:var(--accent)}input,select{width:100%;padding:10px 12px;border-radius:10px;border:1px solid var(--border);background:#111820;color:var(--text);margin-bottom:12px}.launcher{display:flex;flex-direction:column;gap:8px;margin-bottom:20px}.launcher-btn{display:block;text-align:center;padding:14px 16px;font-size:1rem;text-decoration:none}.steps{margin:0 0 16px;padding-left:1.2rem;color:var(--muted);line-height:1.6}.warn{color:#f0c674}