*{margin:0;padding:0;box-sizing:border-box}
:root{--red:#D7263D;--ink:#1a1a1a;--grey:#5a5a5a;--line:#e4e4e4;--bg:#f8f9fa;--card:#fff;--ok:#1e7d32}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans TC","PingFang HK",sans-serif;background:var(--bg);color:var(--ink);line-height:1.7}
#app{max-width:720px;margin:0 auto;padding:20px 18px 72px}
h1{font-size:27px;margin-bottom:10px}
h2{font-size:20px;margin:28px 0 14px}
h3{font-size:17px;margin:20px 0 10px}
p{color:var(--grey);margin-bottom:12px}
.hero{background:var(--card);border-radius:14px;padding:36px 30px;box-shadow:0 2px 12px rgba(0,0,0,.06);margin-top:14px}
.hero .brand{font-size:14px;font-weight:700;color:var(--red);letter-spacing:.06em}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--red);color:#fff;border:none;border-radius:12px;padding:16px 28px;font-size:18px;font-weight:600;cursor:pointer;min-height:56px}
.btn.secondary{background:#fff;color:var(--ink);border:2px solid var(--line)}
.btn.small{padding:10px 18px;font-size:15px;min-height:44px}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn:active{transform:scale(.98)}
.field{margin-bottom:24px}
.field label{display:block;font-size:16px;font-weight:600;margin-bottom:6px}
.field .hint{font-size:13px;color:var(--grey);margin-top:4px}
input[type=text],input[type=number],select{width:100%;font-size:18px;padding:14px;border:2px solid var(--line);border-radius:10px;background:#fff}
input:focus,select:focus{outline:none;border-color:var(--red)}
/* BIG toggle cards — the whole card is the tap target */
.toggle-card{display:flex;align-items:center;gap:14px;width:100%;text-align:left;background:var(--card);border:3px solid var(--line);border-radius:14px;padding:18px;margin-bottom:12px;cursor:pointer;min-height:76px}
.toggle-card .box{flex:none;width:34px;height:34px;border-radius:9px;border:3px solid #bbb;display:flex;align-items:center;justify-content:center;font-size:22px;color:#fff;background:#fff}
.toggle-card.on{border-color:var(--red)}
.toggle-card.on .box{background:var(--red);border-color:var(--red)}
.toggle-card .t{font-size:17px;font-weight:600}
.toggle-card .d{font-size:14px;color:var(--grey)}
/* BIG radio cards */
.radio-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:10px;margin-bottom:12px}
.radio-card{border:3px solid var(--line);border-radius:14px;padding:16px;text-align:center;cursor:pointer;background:var(--card);min-height:72px;display:flex;flex-direction:column;justify-content:center;font-size:17px;font-weight:600}
.radio-card.on{border-color:var(--red);background:#fdf1f3}
.radio-card .d{font-size:13px;color:var(--grey);font-weight:400}
/* Stepper */
.stepper{display:flex;align-items:center;gap:14px}
.stepper button{width:52px;height:52px;border-radius:12px;border:2px solid var(--line);background:#fff;font-size:26px;cursor:pointer}
.stepper .val{font-size:22px;font-weight:700;min-width:36px;text-align:center}
.card{background:var(--card);border-radius:14px;padding:24px;box-shadow:0 2px 8px rgba(0,0,0,.05);margin-bottom:18px}
.tabs{display:flex;gap:8px;margin:16px 0;position:sticky;top:0;background:var(--bg);padding:8px 0;z-index:5}
.tabs button{flex:1;padding:14px;border-radius:12px;border:2px solid var(--line);background:#fff;font-size:17px;font-weight:600;cursor:pointer}
.tabs button.on{background:var(--ink);color:#fff;border-color:var(--ink)}
.linkbox{display:flex;gap:8px;align-items:center;margin-bottom:10px}
.linkbox input{flex:1;font-size:14px;padding:12px}
.err{background:#fdecea;color:#b71c1c;border-radius:10px;padding:12px 16px;margin-bottom:14px;font-size:15px}
.okmsg{background:#e8f5e9;color:var(--ok);border-radius:10px;padding:12px 16px;margin-bottom:14px;font-size:15px}
.big-result{font-size:30px;font-weight:800}
.alt-row{display:flex;justify-content:space-between;gap:12px;padding:14px 0;border-bottom:1px solid var(--line)}
.alt-row:last-child{border-bottom:none}
.alt-row .extra{font-weight:700;color:var(--red);white-space:nowrap}
.alt-row.best .extra{color:var(--ok)}
.kv{display:flex;justify-content:space-between;padding:8px 0;border-bottom:1px solid var(--line)}
.kv:last-child{border-bottom:none}
.muted{color:var(--grey);font-size:14px}
.expiry{font-size:13px;color:var(--grey);text-align:center;margin-top:8px}