:root{--bg:#fff;--fg:#0f172a;--mut:#64748b;--card:#f1f5f9;--brand:#0f766e;--err:#b91c1c;--bd:#cbd5e1}
@media(prefers-color-scheme:dark){:root{--bg:#0b1220;--fg:#e2e8f0;--mut:#94a3b8;--card:#162033;--brand:#2dd4bf;--err:#f87171;--bd:#334155}}
*{box-sizing:border-box}body{margin:0;font:16px/1.5 system-ui,sans-serif;background:var(--bg);color:var(--fg)}
main{max-width:520px;margin:0 auto;padding:16px}h1{font-size:1.4rem;margin:8px 0 16px}
.card{background:var(--card);border-radius:12px;padding:16px;margin-bottom:12px}
label{display:block;font-weight:600;margin:12px 0 4px}
input,select,textarea,button{font:inherit;width:100%;padding:12px;border-radius:8px;border:1px solid var(--bd);background:var(--bg);color:var(--fg)}
button{background:var(--brand);color:var(--bg);border:0;font-weight:700;cursor:pointer;margin-top:12px}
button.sec{background:transparent;color:var(--fg);border:1px solid var(--bd)}button:disabled{opacity:.5}
.row{display:flex;gap:8px}.row>*{flex:1}.total{font-size:1.8rem;font-weight:800}
.err{color:var(--err)}.mut{color:var(--mut)}.code{font-size:2.4rem;font-weight:800;text-align:center;letter-spacing:2px}
table{width:100%;border-collapse:collapse}td,th{padding:6px;text-align:left;border-bottom:1px solid var(--bd);font-size:.9rem}
.lang{width:auto;float:right;padding:4px 8px;margin:0}
h3{margin:12px 0 4px;font-size:1rem}
.tabs{display:flex;gap:8px;margin-bottom:12px}.tabs button{margin:0;background:transparent;color:var(--fg);border:1px solid var(--bd)}
.tabs button.on{background:var(--brand);color:var(--bg);border-color:var(--brand)}
.item{display:flex;justify-content:space-between;align-items:center;gap:8px;padding:8px 0;border-bottom:1px solid var(--bd)}
.stepper{display:flex;align-items:center;gap:8px}.stepper button{width:40px;margin:0;padding:8px}.stepper span{min-width:24px;text-align:center}
label.check{display:flex;gap:8px;align-items:center;font-weight:400}label.check input{width:auto}
section[hidden],[hidden]{display:none!important}
.badge{display:inline-block;padding:0 8px;border-radius:99px;background:var(--err);color:var(--bg);font-size:.75rem;font-weight:700}