:root{font:16px/1.6 system-ui,-apple-system,"Microsoft YaHei",sans-serif;color:#182a36;background:#f1f5f7}*{box-sizing:border-box}body{margin:0}header{background:#123e4b;color:white;padding:22px max(20px,calc((100vw - 1100px)/2));display:flex;justify-content:space-between;align-items:center}header a{color:#fff}main{max-width:1100px;margin:28px auto;padding:0 18px}h1{font-size:24px;margin:0}h2{font-size:20px;margin:0 0 18px}a{color:#087b80}section,.card{background:#fff;border:1px solid #dce5e9;border-radius:14px;padding:24px;margin-bottom:20px;box-shadow:0 4px 15px #182a3606}.login{max-width:440px;margin:10vh auto}label{display:block;font-size:14px;color:#52616c;margin:12px 0}input,select,button{font:inherit;border-radius:7px;padding:10px 12px}input,select{width:100%;border:1px solid #ccd8df;background:white;color:#182a36}button,.button{border:0;background:#087b80;color:white;cursor:pointer;display:inline-block;text-decoration:none;padding:10px 18px;border-radius:7px}button:disabled{opacity:.55;cursor:wait}.secondary{background:#e7eef1;color:#183c48}form.grid,.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px}form.grid label{margin:0}form.grid button{align-self:end}.toolbar{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin:18px 0}.toolbar select{width:auto}.muted{color:#6b7a83;font-size:14px}.status{border-radius:20px;padding:3px 10px;background:#e6f5ef;color:#246950;font-size:13px}.status.used{background:#edf0f2;color:#69747c}.status.expired{background:#fdeceb;color:#b34b43}img{max-width:100%;height:auto;border-radius:8px}.coupon-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:18px}.coupon-grid img{width:100%;height:180px;object-fit:contain;background:#f6f8f9}.coupon-grid .card{margin:0}.table-wrap{overflow:auto}table{width:100%;border-collapse:collapse;white-space:nowrap}td,th{text-align:left;padding:12px;border-bottom:1px solid #e7edf0}td button{padding:5px 10px;margin-right:5px}.message{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:#173b48;color:white;padding:12px 24px;border-radius:10px;max-width:90vw;z-index:10}.detail{max-width:720px;margin:auto}.code{font-family:monospace;font-size:22px;font-weight:bold;letter-spacing:1px}@media(max-width:600px){header{padding:18px}main{margin-top:18px}section,.card{padding:18px}form.grid{grid-template-columns:1fr}h1{font-size:21px}}