:root{--bg:#f7f7f5;--surface:#fff;--text:#1d1d1b;--muted:#6b6b66;--border:#d9d9d4;--accent:#2f5bd3;--accent-text:#fff;--right:#1f7a3d;--wrong:#b3261e;--pair-1:#2f5bd3;--pair-2:#c2410c;--pair-3:#15803d;--pair-4:#9333ea;--pair-5:#0e7490;--pair-6:#be185d;--pair-7:#a16207;--pair-8:#4d7c0f;--pair-9:#6d28d9;--pair-10:#b91c1c;color:var(--text);background:var(--bg);font-family:system-ui,-apple-system,Segoe UI,sans-serif;line-height:1.4}@media (prefers-color-scheme:dark){:root{--bg:#161615;--surface:#222220;--text:#ecece8;--muted:#a3a39c;--border:#3a3a37;--accent:#7b9cf5;--accent-text:#0e1220;--right:#5fcf85;--wrong:#f2837b;--pair-1:#7b9cf5;--pair-2:#fb923c;--pair-3:#4ade80;--pair-4:#c084fc;--pair-5:#22d3ee;--pair-6:#f472b6;--pair-7:#facc15;--pair-8:#a3e635;--pair-9:#a78bfa;--pair-10:#f87171}}*{box-sizing:border-box}body{background:var(--bg);margin:0}#root{max-width:960px;margin:0 auto;padding:16px}button{font:inherit;border:1px solid var(--border);background:var(--surface);color:var(--text);cursor:pointer;border-radius:8px;padding:10px 18px}button:disabled{opacity:.5;cursor:default}button.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-text);font-weight:600}input{font:inherit;border:1px solid var(--border);background:var(--surface);color:var(--text);border-radius:8px;width:100%;padding:10px 12px}h1,h2,h3{line-height:1.2}.center{text-align:center}.muted{color:var(--muted)}.big{font-size:1.25rem;font-weight:600}.error{color:var(--wrong);text-align:center}.bar{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;gap:12px;margin-bottom:12px;padding:8px 0 12px;font-weight:600;display:flex}.timer{font-variant-numeric:tabular-nums;font-size:1.25rem}.actions{justify-content:flex-end;gap:12px;margin-top:16px;display:flex}.home{max-width:360px;margin:10vh auto 0}.home h1{text-align:center}.join{gap:12px;margin-bottom:32px;display:grid}.join label{gap:4px;font-weight:600;display:grid}.prompt{margin-top:0;font-weight:600}.columns{grid-template-columns:minmax(0,9fr) minmax(0,11fr);gap:8px;display:grid}.column{align-content:start;gap:8px;margin:0;padding:0;list-style:none;display:grid}.card{text-align:left;overflow-wrap:break-word;align-items:flex-start;gap:8px;width:100%;min-height:48px;padding:10px 8px;font-size:.95rem;display:flex}.card.term{font-weight:600}.card .badge{border:1px dashed var(--border);width:1.5em;height:1.5em;color:var(--muted);border-radius:50%;flex:none;justify-content:center;align-items:center;font-size:.8rem;font-weight:700;display:inline-flex}.card.definition:not(.linked) .badge{visibility:hidden}.card.selected{outline:3px solid var(--accent);outline-offset:-1px}.card.linked{border-color:var(--pair);border-width:2px}.card.linked .badge{background:var(--pair);color:var(--surface);border:none}.pair-1{--pair:var(--pair-1)}.pair-2{--pair:var(--pair-2)}.pair-3{--pair:var(--pair-3)}.pair-4{--pair:var(--pair-4)}.pair-5{--pair:var(--pair-5)}.pair-6{--pair:var(--pair-6)}.pair-7{--pair:var(--pair-7)}.pair-8{--pair:var(--pair-8)}.pair-9{--pair:var(--pair-9)}.pair-10{--pair:var(--pair-10)}.board .actions{background:var(--bg);margin-top:8px;padding:12px 0;position:sticky;bottom:0}.answers{gap:6px;padding:0;list-style:none;display:grid}.answers li{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:8px 10px}.answers .mark{margin-right:6px;font-weight:700}.answers .right .mark{color:var(--right)}.answers .wrong .mark{color:var(--wrong)}.standings{gap:4px;padding:0;list-style:none;display:grid}.standings li{background:var(--surface);border:1px solid var(--border);font-variant-numeric:tabular-nums;border-radius:8px;grid-template-columns:2.5em 1fr auto;padding:8px 10px;display:grid}.standings li.me{border-color:var(--accent);border-width:2px;font-weight:600}.standings .rank{color:var(--muted)}.join-code{letter-spacing:.1em;font-variant-numeric:tabular-nums;margin:0;font-size:clamp(3rem,12vw,7rem);font-weight:800}.lobby{flex-wrap:wrap;justify-content:center;gap:8px;margin-bottom:24px;padding:0;list-style:none;display:flex}.lobby li{background:var(--surface);border:1px solid var(--border);border-radius:999px;padding:6px 12px}.host-terms{gap:8px;font-size:1.5rem;display:grid}.teacher{max-width:820px;margin:0 auto}.teacher h1{margin:8px 0 16px}button.link{color:var(--accent);background:0 0;border:none;padding:0;font-weight:600}button.danger{color:var(--wrong)}button.icon{padding:6px 10px;line-height:1}.actions.start{justify-content:flex-start;margin:0 0 16px}.actions.sticky{background:var(--bg);border-top:1px solid var(--border);padding:12px 0;position:sticky;bottom:0}.row-actions{flex-wrap:wrap;gap:8px;display:flex}.quiz-list{gap:8px;padding:0;list-style:none;display:grid}.quiz-list li{background:var(--surface);border:1px solid var(--border);border-radius:8px;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;padding:12px 14px;display:flex}.field{gap:4px;margin-bottom:12px;font-weight:600;display:grid}.field.grow{flex:1}.field input[type=number]{width:6.5em}textarea{font:inherit;border:1px solid var(--border);background:var(--surface);width:100%;color:var(--text);border-radius:8px;padding:10px 12px}.round-card,.import-panel{background:var(--surface);border:1px solid var(--border);border-radius:10px;margin-bottom:16px;padding:12px 14px 14px}.round-card h2,.import-panel h2{margin:4px 0;font-size:1.1rem}.round-head{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px;margin-bottom:8px;display:flex}.round-settings{flex-wrap:wrap;gap:12px;display:flex}.pairs{gap:6px;margin-bottom:10px;display:grid}.pair-row{grid-template-columns:minmax(0,2fr) minmax(0,3fr) auto;align-items:center;gap:6px;display:grid}.pair-row.header{color:var(--muted);font-size:.9rem;font-weight:600}.problems{color:var(--wrong);padding-left:20px}.auth-controls{align-items:center;display:flex}