/* ひらがな語彙クイズ  共通スタイル */
:root {
  --bg: #f6f3ee;
  --card: #ffffff;
  --ink: #1f2430;
  --muted: #6b7280;
  --line: #e4ded4;
  --accent: #2f4f8f;        /* 藍色 */
  --accent-ink: #ffffff;
  --accent-soft: #e6ecf7;
  --ok: #1f7a4d;
  --ok-soft: #e3f4ea;
  --ng: #b3392f;
  --ng-soft: #fbe7e4;
  --warn: #a86a00;
  --warn-soft: #fff1d6;
  --radius: 14px;
  --font: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Yu Gothic", Meiryo,
          "Noto Sans JP", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.6;
}
[hidden] { display: none !important; }
h1 { font-size: 1.6rem; margin: 0 0 .6rem; }
h2 { font-size: 1.2rem; margin: 0 0 .8rem; }
p { margin: .4rem 0 1rem; }
.muted { color: var(--muted); }

/* ---------- 上部バー ---------- */
.topbar {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 12px 20px; background: var(--card); border-bottom: 1px solid var(--line);
}
.brand { font-weight: 700; font-size: 1.1rem; }
.tag {
  font-size: .75rem; font-weight: 600; background: var(--accent-soft); color: var(--accent);
  padding: 2px 8px; border-radius: 99px; margin-left: 6px; vertical-align: middle;
}
.topbar-right { display: flex; align-items: center; gap: 10px; font-size: .9rem; }

/* ---------- レイアウト ---------- */
.wrap { max-width: 1100px; margin: 0 auto; padding: 20px 16px 48px; }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; margin-bottom: 18px;
}
.narrow { max-width: 520px; margin-left: auto; margin-right: auto; }
.center { text-align: center; }
.grid-2 { display: grid; grid-template-columns: 340px 1fr; gap: 18px; align-items: start; }
@media (max-width: 860px) { .grid-2 { grid-template-columns: 1fr; } }

/* ---------- フォーム・ボタン ---------- */
label { display: block; font-size: .92rem; margin-bottom: 12px; color: var(--muted); }
input[type=email], input[type=password], input[type=text], .code-input {
  display: block; width: 100%; margin-top: 4px; padding: 11px 12px; font: inherit; color: var(--ink);
  border: 1px solid var(--line); border-radius: 10px; background: #fff;
}
input:focus, button:focus-visible { outline: 3px solid var(--accent-soft); outline-offset: 1px; border-color: var(--accent); }
.form-msg { min-height: 1.4em; color: var(--ng); font-size: .95rem; margin-top: 10px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  font: inherit; font-weight: 600; padding: 10px 18px; border-radius: 10px; cursor: pointer;
  border: 1px solid var(--line); background: #fff; color: var(--ink);
  transition: background .12s, transform .05s; white-space: nowrap;
}
.btn:hover:not(:disabled) { background: #f3f1ec; }
.btn:active:not(:disabled) { transform: translateY(1px); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn-primary:hover:not(:disabled) { background: #26437c; }
.btn-ghost { background: transparent; }
.btn-warn { color: var(--warn); border-color: #ecd3a3; }
.btn-danger { color: var(--ng); border-color: #efc2bc; }
.btn-sm { padding: 7px 12px; font-size: .9rem; }
.btn-lg { padding: 14px 22px; font-size: 1.1rem; }
.btn-block { width: 100%; }
.btn-col { display: grid; gap: 8px; margin-top: 16px; }

/* ---------- 状態表示 ---------- */
.pill { display: inline-block; font-size: .85rem; font-weight: 600; padding: 3px 10px; border-radius: 99px; white-space: nowrap; }
.pill-on   { background: var(--ok-soft);  color: var(--ok); }
.pill-off  { background: #eeece8;         color: var(--muted); }
.pill-warn { background: var(--warn-soft); color: var(--warn); }
.pill-wait { background: var(--accent-soft); color: var(--accent); }
.alert { padding: 12px 16px; border-radius: 10px; margin-bottom: 16px; white-space: pre-line; }
.alert-error { background: var(--ng-soft); color: var(--ng); }

/* ---------- 先生画面 ---------- */
.field-label { font-size: .82rem; color: var(--muted); margin: 10px 0 4px; }
.copy-row { display: flex; gap: 6px; }
.copy-row input { margin: 0; font-size: .8rem; }
.join-code {
  font-size: 2.4rem; font-weight: 700; letter-spacing: .25em; text-align: center;
  background: var(--accent-soft); color: var(--accent); border-radius: 10px; padding: 6px 0; margin-bottom: 8px;
  font-variant-numeric: tabular-nums;
}
.status-list { margin-top: 18px; border-top: 1px solid var(--line); padding-top: 10px; }
.status-row { display: flex; justify-content: space-between; align-items: center; padding: 6px 0; }

.q-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; }
.t-fr { font-size: 2.2rem; font-weight: 700; margin: 4px 0 12px; }
.t-choices { list-style: none; padding: 0; margin: 0 0 16px; display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.t-choices li {
  border: 2px solid var(--line); border-radius: 10px; padding: 10px 12px; font-size: 1.3rem;
  display: flex; align-items: center; gap: 10px;
}
.t-choices li.is-answer { border-color: var(--ok); }
.t-choices li.is-answer::after { content: "正解"; margin-left: auto; font-size: .75rem; color: var(--ok); font-weight: 700; }
.t-choices li.picked-ok { background: var(--ok-soft); }
.t-choices li.picked-ng { background: var(--ng-soft); border-color: var(--ng); }
.lbl {
  display: inline-grid; place-items: center; width: 1.7em; height: 1.7em; border-radius: 50%;
  background: #eeece8; font-size: .8em; font-weight: 700; flex: none; font-family: system-ui, sans-serif;
}
.answer-box { background: #faf8f4; border-radius: 10px; padding: 12px 14px; margin-bottom: 10px; }
.student-answer { font-size: 1.5rem; font-weight: 700; }
.student-answer.pending { font-size: 1rem; font-weight: 400; color: var(--muted); }
.judge { font-size: 1.3rem; font-weight: 700; margin-top: 4px; }
.judge.ok { color: var(--ok); }
.judge.ng { color: var(--ng); }

.nav-row { display: flex; gap: 10px; margin-top: 18px; }
.nav-row .btn { flex: 1; }
.progress { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 16px; }
.dot {
  width: 30px; height: 30px; display: grid; place-items: center; font-size: .75rem; border-radius: 8px;
  background: #eeece8; color: var(--muted); font-variant-numeric: tabular-nums;
}
.dot.ok { background: var(--ok-soft); color: var(--ok); font-weight: 700; }
.dot.ng { background: var(--ng-soft); color: var(--ng); font-weight: 700; }
.dot.current { outline: 2px solid var(--accent); }

.final-score { font-size: 3rem; font-weight: 800; color: var(--accent); text-align: center; margin: 6px 0 14px; }
.result-table { width: 100%; border-collapse: collapse; font-size: .95rem; }
.result-table th, .result-table td { padding: 7px 8px; border-bottom: 1px solid var(--line); text-align: left; }
.result-table th { color: var(--muted); font-weight: 600; font-size: .85rem; }
.result-table td.ok { color: var(--ok); font-weight: 700; }
.result-table td.ng { color: var(--ng); font-weight: 700; }

/* ---------- 生徒画面（大きく読みやすく） ---------- */
body.student { font-size: 20px; }
.student-wrap { max-width: 860px; }
.big-text { font-size: 1.3rem; }
.code-input {
  font-size: 2.4rem; text-align: center; letter-spacing: .3em; padding: 12px; margin: 10px 0 16px;
  font-variant-numeric: tabular-nums;
}
.s-progress { text-align: center; color: var(--muted); font-weight: 600; margin-bottom: 10px; }
.s-question { text-align: center; padding: 28px 20px; }
.s-instruction { font-size: 1.15rem; color: var(--muted); margin: 0 0 6px; }
.s-fr { font-size: clamp(2.6rem, 8vw, 4.2rem); font-weight: 800; line-height: 1.2; word-break: break-word; }
.s-choices { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 560px) { .s-choices { grid-template-columns: 1fr; } }
.s-choice {
  display: flex; align-items: center; gap: 14px; min-height: 96px; padding: 14px 18px;
  font: inherit; font-size: clamp(1.9rem, 5vw, 2.6rem); font-weight: 600; color: var(--ink);
  background: #fff; border: 3px solid var(--line); border-radius: 16px; cursor: pointer; text-align: left;
  transition: border-color .12s, background .12s; touch-action: manipulation;
}
.s-choice .lbl { font-size: 1.1rem; width: 2em; height: 2em; }
.s-choice:hover:not(:disabled) { border-color: var(--accent); background: var(--accent-soft); }
.s-choice:disabled { cursor: default; opacity: .55; }
.s-choice.chosen { opacity: 1; border-color: var(--accent); background: var(--accent-soft); }
.s-choice.chosen .lbl { background: var(--accent); color: #fff; }
.s-status { text-align: center; font-size: 1.25rem; font-weight: 600; color: var(--accent); min-height: 1.6em; margin-top: 18px; }

.spinner {
  width: 46px; height: 46px; margin: 4px auto 16px; border-radius: 50%;
  border: 5px solid var(--accent-soft); border-top-color: var(--accent);
  animation: spin 1s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .spinner { animation: none; } }

/* ---------- 答え合わせ ---------- */
.btn-reveal { background: var(--ok); border-color: var(--ok); color: #fff; margin-bottom: 8px; }
.btn-reveal:hover:not(:disabled) { background: #186340; }
.btn-reveal:disabled { background: var(--ok-soft); border-color: var(--ok-soft); color: var(--ok); opacity: 1; }
.s-choice.correct, .s-choice.correct:disabled { opacity: 1; border-color: var(--ok); background: var(--ok-soft); }
.s-choice.correct .lbl { background: var(--ok); color: #fff; }
.s-choice.wrong, .s-choice.wrong:disabled { opacity: 1; border-color: var(--ng); background: var(--ng-soft); }
.s-choice.wrong .lbl { background: var(--ng); color: #fff; }
.s-status.ok { color: var(--ok); font-size: 1.6rem; }
.s-status.ng { color: var(--ng); font-size: 1.4rem; }

/* ---------- 対面モード：画面下の先生用操作バー ---------- */
body.inperson .student-wrap { padding-bottom: 120px; }
.teacher-bar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 10;
  display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 10px;
  padding: 12px 16px; background: rgba(255,255,255,.96); border-top: 1px solid var(--line);
  font-size: 17px;
}
.teacher-bar .btn-lg { min-width: 150px; }
.teacher-bar .btn-reveal { margin-bottom: 0; }
@media (max-width: 560px) { .teacher-bar .btn-lg { min-width: 0; flex: 1; padding: 12px 10px; font-size: 1rem; } }
body.inperson .result-table { font-size: 1.05rem; }