:root {
  --bg: #f6f5f1;
  --card: #ffffff;
  --ink: #1d1f24;
  --muted: #646a73;
  --line: #e2e0d9;
  --accent: #1f5fbf;
  --accent-ink: #ffffff;
  --ok: #1b7f4b;
  --ok-bg: #e3f4ea;
  --bad: #b3261e;
  --bad-bg: #fbe5e3;
  --warn: #8a5a00;
  --warn-bg: #fff2d6;
  --radius: 12px;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171b;
    --card: #1f2227;
    --ink: #eceef1;
    --muted: #9aa1ab;
    --line: #33373e;
    --accent: #6fa3ff;
    --accent-ink: #0d1420;
    --ok: #6fd39c;
    --ok-bg: #173325;
    --bad: #ff8a80;
    --bad-bg: #3a1c1a;
    --warn: #f3c46b;
    --warn-bg: #3a2e14;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); line-height: 1.45; }
.wrap { max-width: 1100px; margin: 0 auto; padding: 20px 16px 60px; }
.narrow { max-width: 520px; }
h1 { font-size: 1.6rem; margin: 0 0 4px; }
h2 { font-size: 1.15rem; margin: 0 0 12px; }
p { margin: 0 0 10px; }
.muted { color: var(--muted); }
.small { font-size: .88rem; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; margin-bottom: 16px; }
.row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.grow { flex: 1 1 auto; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 760px) { .grid2 { grid-template-columns: 1fr; } }
label { display: block; font-weight: 600; margin: 10px 0 6px; }
input[type=text], input[type=number], input[type=password], textarea, select {
  width: 100%; font: inherit; padding: 10px 12px; border-radius: 8px;
  border: 1px solid var(--line); background: var(--bg); color: var(--ink);
}
textarea { min-height: 180px; font-family: ui-monospace, Menlo, Consolas, monospace; font-size: .9rem; }
input:focus, textarea:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
button {
  font: inherit; font-weight: 600; border: 0; border-radius: 8px; padding: 10px 16px; cursor: pointer;
  background: var(--accent); color: var(--accent-ink);
}
button.sec { background: transparent; color: var(--ink); border: 1px solid var(--line); }
button.danger { background: var(--bad); color: #fff; }
button:disabled { opacity: .45; cursor: not-allowed; }
button.big { font-size: 1.15rem; padding: 14px 22px; }
.choice { display: flex; gap: 8px; flex-wrap: wrap; }
.choice label { font-weight: 500; margin: 0; padding: 10px 14px; border: 1px solid var(--line); border-radius: 8px; cursor: pointer; flex: 1 1 200px; }
.choice input { margin-right: 6px; }
.choice label:has(input:checked) { border-color: var(--accent); outline: 1px solid var(--accent); }
.hidden { display: none !important; }
.pill { display: inline-block; padding: 2px 10px; border-radius: 999px; font-size: .82rem; font-weight: 600; background: var(--line); }
.pill.ok { background: var(--ok-bg); color: var(--ok); }
.pill.bad { background: var(--bad-bg); color: var(--bad); }
.pill.warn { background: var(--warn-bg); color: var(--warn); }
.msg { padding: 10px 12px; border-radius: 8px; margin: 10px 0; }
.msg.bad { background: var(--bad-bg); color: var(--bad); }
.msg.ok { background: var(--ok-bg); color: var(--ok); }
.msg.warn { background: var(--warn-bg); color: var(--warn); }

/* professor */
.code-big { font-size: 3.4rem; font-weight: 800; letter-spacing: .12em; line-height: 1; }
.timer { font-size: 2.6rem; font-weight: 800; font-variant-numeric: tabular-nums; }
.timer.low { color: var(--bad); }
.question-big { font-size: 1.9rem; font-weight: 700; margin: 6px 0 12px; overflow-wrap: anywhere; }
.qr svg { width: 150px; height: 150px; background: #fff; border-radius: 8px; }
.students { display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 8px; }
.st { border: 1px solid var(--line); border-radius: 10px; padding: 8px 10px; background: var(--bg); position: relative; }
.st .n { font-weight: 700; overflow-wrap: anywhere; padding-right: 18px; }
.st.out { opacity: .5; }
.st.answered { border-color: var(--accent); }
.st.right { background: var(--ok-bg); border-color: var(--ok); }
.st.wrong { background: var(--bad-bg); border-color: var(--bad); }
.st .x { position: absolute; top: 4px; right: 6px; background: none; color: var(--muted); padding: 0 4px; font-size: 1rem; }
.dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--ok); margin-right: 6px; }
.dot.off { background: var(--muted); }
table { width: 100%; border-collapse: collapse; font-size: .92rem; }
th, td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 600; }
.winner { font-size: 2rem; font-weight: 800; }

/* aluno */
.aluno-q { font-size: 1.6rem; font-weight: 700; margin: 8px 0 16px; overflow-wrap: anywhere; }
.opts { display: grid; gap: 10px; }
.opts button { text-align: left; font-size: 1.1rem; padding: 16px; background: var(--card); color: var(--ink); border: 2px solid var(--line); }
.opts button.sel { border-color: var(--accent); }
.result-big { font-size: 2.2rem; font-weight: 800; margin: 10px 0; }
.hearts { font-size: 1.3rem; letter-spacing: 2px; color: var(--bad); }
.prova-q { border-top: 1px solid var(--line); padding-top: 14px; margin-top: 14px; }
.saved { font-size: .82rem; color: var(--ok); margin-left: 8px; }

/* avaliação */
table.aval th, table.aval td { padding: 4px 6px; white-space: nowrap; }
table.aval tr.cot input { width: 52px; padding: 4px 6px; font-size: .85rem; }
table.aval input.nota { width: 64px; padding: 6px 8px; font-weight: 700; }
.cel { font-weight: 500; font-size: .85rem; padding: 5px 8px; min-width: 52px; border: 1px solid transparent; }
.cel.right { background: var(--ok-bg); color: var(--ok); }
.cel.wrong { background: var(--bad-bg); color: var(--bad); }
.mexida { outline: 2px dashed var(--warn); outline-offset: 1px; }
.limites input { width: 64px; padding: 6px 8px; }
.limites span { white-space: nowrap; }
.mencoes .mrow { gap: 8px; margin-bottom: 6px; flex-wrap: nowrap; }
.mencoes .mrow span { white-space: nowrap; min-width: 92px; }
.mencoes input[data-mmin] { width: 60px; padding: 6px 8px; }
.mencoes button { padding: 6px 12px; }

/* vez */
.st .nome { cursor: pointer; border-bottom: 1px dotted var(--muted); }
.st.fechado { border-style: dashed; background: transparent; }
.st.fechado .n { color: var(--muted); }
.vez { display: flex; gap: 6px; margin-top: 8px; }
.vez button { padding: 5px 10px; font-size: .82rem; }
.vez .tg { background: var(--line); color: var(--ink); flex: 1; }
.vez .tg.on { background: var(--ok); color: #fff; }