:root {
  --bg: #eceef3;
  --surface: #ffffff;
  --ink: #1c2230;
  --muted: #6b7280;
  --line: #d9dee7;
  --brand: #3b46b8;
  --accent: #e8590c;
  --ok: #17915f;
  --ng: #c0392b;
  --lost: #8a94a6;
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Noto Sans JP", sans-serif;
  -webkit-tap-highlight-color: transparent;
}
.hidden { display: none !important; }

/* ---------- 参加画面 ---------- */
.join { min-height: 100%; display: grid; place-items: center; padding: 24px; }
.join-card { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 28px; width: min(420px, 100%); }
.brand { margin: 0 0 4px; font-size: 26px; letter-spacing: -0.01em; }
.brand span { color: var(--brand); }
.lede { margin: 0 0 20px; color: var(--muted); }
.field { display: block; margin-bottom: 16px; }
.field > span { display: block; font-size: 13px; color: var(--muted); margin-bottom: 6px; }
.field input[type="text"], .field input[type="password"] { width: 100%; padding: 12px 14px; border: 1px solid var(--line); border-radius: 10px; font-size: 16px; }
.roles { display: flex; gap: 10px; }
.role { flex: 1; display: flex; align-items: center; justify-content: center; gap: 8px; padding: 12px; border: 1px solid var(--line); border-radius: 10px; cursor: pointer; }
.role input { accent-color: var(--brand); }
.status { min-height: 20px; color: var(--accent); font-size: 14px; margin: 12px 0 0; }
.tiny { text-align: center; font-size: 13px; margin: 14px 0 0; }
.tiny a { color: var(--muted); text-decoration: none; }
.tiny a:hover { color: var(--brand); text-decoration: underline; }

/* ---------- ボタン ---------- */
.btn { appearance: none; border: 1px solid var(--line); background: var(--surface); color: var(--ink); padding: 12px 16px; border-radius: 10px; font-size: 15px; cursor: pointer; }
.btn:hover { border-color: #b9c0cd; }
.btn:disabled { opacity: 0.5; cursor: default; }
.btn-brand { background: var(--brand); color: #fff; border-color: var(--brand); width: 100%; padding: 14px; font-size: 16px; }
.btn-accent { background: var(--accent); color: #fff; border-color: var(--accent); }

/* ---------- アプリ枠 ---------- */
.app { height: 100%; display: flex; flex-direction: column; }
.bar { display: flex; align-items: center; justify-content: space-between; padding: 10px 16px; background: var(--surface); border-bottom: 1px solid var(--line); }
.bar-left { display: flex; align-items: center; gap: 10px; }
.pill { font-size: 13px; color: var(--muted); background: var(--bg); padding: 3px 10px; border-radius: 999px; }
.conn { font-size: 13px; padding: 3px 10px; border-radius: 999px; }
.conn-on { color: var(--ok); background: #e6f4ee; }
.conn-off { color: var(--lost); background: #eef0f4; }

/* ---------- 先生: モード切替バー ---------- */
.modebar { display: flex; gap: 8px; padding: 8px 16px; background: var(--surface); border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.mode-btn { appearance: none; border: 1px solid var(--line); background: var(--surface); color: var(--muted); padding: 8px 16px; border-radius: 999px; font-size: 14px; font-weight: 600; cursor: pointer; }
.mode-btn:hover { border-color: #b9c0cd; }
.mode-btn.active { background: var(--brand); color: #fff; border-color: var(--brand); }

/* ---------- コンテンツ領域・ビュー ---------- */
.content { flex: 1; display: flex; flex-direction: column; min-height: 0; overflow: auto; }
.view { flex: 1; display: flex; flex-direction: column; min-height: 0; }

/* 待機 */
.idle-msg { flex: 1; display: grid; place-content: center; text-align: center; color: var(--muted); gap: 6px; }
.idle-title { font-size: 22px; font-weight: 700; color: var(--ink); }
.idle-sub { font-size: 15px; }

/* 描画 */
.draw-tools { display: flex; gap: 10px; padding: 10px 16px 0; }
.stage { flex: 1; display: grid; place-items: center; padding: 14px; overflow: hidden; }
#canvas {
  width: min(100%, calc((100vh - 260px) * 1.6));
  aspect-ratio: 1280 / 800;
  max-width: 100%;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  touch-action: none;
  cursor: crosshair;
}

/* 共通: 問題文 */
.quiz-q { font-size: 20px; font-weight: 700; line-height: 1.5; margin: 4px 0 14px; }

/* ---------- 早押しクイズ ---------- */
#view-buzz > .buzz-teacher,
#view-buzz { padding: 0; }
.buzz-teacher { width: min(560px, 100%); margin: 0 auto; padding: 18px 16px; }
.buzz-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 12px; }
.winner { font-size: 18px; margin: 6px 0; }
.winner.muted { color: var(--muted); }
.order { margin: 10px 0 0; padding-left: 20px; color: var(--muted); font-size: 14px; columns: 2; }

/* 生徒のブザー */
#view-buzz { justify-content: center; align-items: center; padding: 18px 16px; }
#view-buzz .quiz-q { text-align: center; width: min(560px, 100%); }
.buzzer { width: min(560px, 100%); border: none; border-radius: 14px; padding: 30px; font-size: 24px; font-weight: 700; color: #fff; cursor: pointer; }
.buzzer.wait { background: #c3c9d4; cursor: default; }
.buzzer.live { background: var(--accent); }
.buzzer.live:active { transform: scale(0.99); }
.buzzer.won { background: var(--ok); }
.buzzer.lost { background: var(--lost); cursor: default; }
.buzzer:disabled { cursor: default; }
/* 先生ビューは左寄せに戻す */
#view-buzz:has(.buzz-teacher) { justify-content: flex-start; align-items: stretch; }

/* ---------- 4択クイズ 共通ラッパ ---------- */
.quiz-form, .quiz-live, .quiz-choose, .quiz-answered, .quiz-result, .quiz-wait {
  width: min(560px, 100%); margin: 0 auto; padding: 18px 16px;
}
.quiz-wait { text-align: center; color: var(--muted); margin-top: 40px; font-size: 16px; }

/* 出題フォーム(先生) */
.qf-title { font-size: 16px; font-weight: 700; margin-bottom: 10px; }
.q-text { width: 100%; min-height: 64px; padding: 12px 14px; border: 1px solid var(--line); border-radius: 10px; font-size: 16px; font-family: inherit; resize: vertical; }
.qf-hint { font-size: 13px; color: var(--muted); margin: 12px 0 8px; }
.choice-row { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.choice-row input[type="radio"] { width: 20px; height: 20px; accent-color: var(--ok); flex: none; }
.choice-input { flex: 1; padding: 11px 12px; border: 1px solid var(--line); border-radius: 10px; font-size: 15px; }
.quiz-form .btn-accent { width: 100%; margin-top: 12px; padding: 14px; font-size: 16px; }
.qf-err { min-height: 18px; color: var(--ng); font-size: 14px; margin: 8px 0 0; }

/* 選択肢(生徒) */
.choices { display: flex; flex-direction: column; gap: 12px; }
.choice-btn {
  appearance: none; border: 2px solid var(--line); background: var(--surface); color: var(--ink);
  padding: 18px 16px; border-radius: 12px; font-size: 18px; font-weight: 600; cursor: pointer; text-align: left;
}
.choice-btn:hover { border-color: var(--brand); }
.choice-btn:active { transform: scale(0.99); }

/* 回答済み(生徒) */
.answered-badge { background: #eef1fb; color: var(--brand); border-radius: 10px; padding: 14px 16px; font-size: 16px; }
.quiz-meta { color: var(--muted); font-size: 14px; margin-top: 12px; }

/* 結果ヘッダ(生徒) */
.result-head { font-size: 22px; font-weight: 800; padding: 10px 0 14px; }
.result-head.ok { color: var(--ok); }
.result-head.ng { color: var(--ng); }
.result-head.skip { color: var(--muted); }

/* 回答分布バー */
.dist { display: flex; flex-direction: column; gap: 10px; margin: 6px 0 4px; }
.dist-row { display: grid; grid-template-columns: 1fr 2fr auto; align-items: center; gap: 10px; }
.dist-label { font-size: 15px; }
.dist-track { height: 20px; background: var(--bg); border-radius: 999px; overflow: hidden; }
.dist-fill { height: 100%; background: #aab2c6; border-radius: 999px; transition: width 0.3s ease; }
.dist-num { font-size: 14px; color: var(--muted); min-width: 24px; text-align: right; }
.dist-row.correct .dist-label { color: var(--ok); font-weight: 700; }
.dist-row.correct .dist-fill { background: var(--ok); }

/* ---------- 問題バンク(事前入力) ---------- */
.qf-actions { display: flex; gap: 10px; margin-top: 12px; }
.qf-actions .btn-accent { flex: 1; padding: 14px; font-size: 16px; }
.btn-sm { padding: 7px 12px; font-size: 13px; border-radius: 8px; }
.bank { margin-top: 20px; border-top: 1px solid var(--line); padding-top: 14px; }
.bank-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; flex-wrap: wrap; margin-bottom: 10px; font-size: 14px; font-weight: 700; color: var(--muted); }
.bank-io { display: flex; gap: 8px; }
.bank-empty { color: var(--muted); font-size: 14px; padding: 6px 0; }
.bank-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.bank-item { display: flex; align-items: center; gap: 10px; padding: 10px 12px; background: var(--bg); border-radius: 10px; }
.bank-text { flex: 1; font-size: 15px; min-width: 0; overflow-wrap: anywhere; }
.bank-sub { color: var(--muted); font-size: 12px; }
.bank-btns { display: flex; gap: 6px; flex: none; }
.bank-btns .bank-ask { background: var(--brand); color: #fff; border-color: var(--brand); }
.bank-btns .bank-del { color: var(--ng); }
.bank-status { min-height: 16px; color: var(--ok); font-size: 13px; margin: 8px 0 0; }