/* kids.css — 兒童/教師模式 */

:root {
  --kids-green: #2e7d32; --kids-bg: #f1f8e9; --kids-card: #ffffff;
  --kids-border: #c8e6c9; --kids-ink: #1b5e20; --kids-muted: #558b2f;
  --kids-amber: #f59e0b; --kids-amber-ink: #4b321c;
  --kids-quiz-ok: #43a047; --kids-quiz-err: #e53935;
  --kids-teacher: #1565c0; --kids-teacher-bg: #e3f2fd;
}

*,*::before,*::after { box-sizing:border-box; margin:0; padding:0; -webkit-tap-highlight-color:transparent; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang TC", "Noto Sans TC", system-ui, sans-serif;
  background: var(--kids-bg); color: var(--kids-ink); min-height: 100vh; font-size: 1rem;
}

/* ── Top bar ──────────────────────────────────────────── */
#kb-bar {
  display: flex; align-items: center; gap: 10px; padding: 12px 16px;
  background: var(--kids-green); color: #fff; position: sticky; top: 0; z-index: 100;
  box-shadow: 0 2px 8px rgba(0,0,0,.25);
}
#kb-bar h1 { flex: 1; font-size: 1.1rem; font-weight: 700; }
.kb-tbar-btn {
  background: rgba(255,255,255,.2); border: none; color: #fff; border-radius: 8px;
  padding: 7px 12px; cursor: pointer; font-weight: 700; min-height: 44px;
  font-family: inherit; font-size: .85rem; white-space: nowrap;
}
.kb-tbar-btn.teacher-on { background: #fbc02d; color: #1a1a1a; }

/* ── Teacher banner ───────────────────────────────────── */
#teacher-banner {
  display: none; background: var(--kids-teacher-bg); color: var(--kids-teacher);
  padding: 8px 16px; font-size: .82rem; font-weight: 600; text-align: center;
  border-bottom: 2px solid #bbdefb;
}
body.teacher-mode #teacher-banner { display: block; }

/* ── Content ──────────────────────────────────────────── */
#kb-body { padding: 16px; max-width: 540px; margin: 0 auto; }
.gap { height: 12px; }
.gap-lg { height: 20px; }

/* ── Grandpa tree avatar ──────────────────────────────── */
#grandpa-wrap { display: flex; align-items: flex-end; gap: 14px; margin-bottom: 4px; }
#grandpa-face {
  font-size: 4.5rem; line-height: 1; flex-shrink: 0;
  filter: drop-shadow(0 2px 6px rgba(0,0,0,.15));
  transition: transform .3s;
}
#grandpa-face.bounce { animation: bounce .4s ease; }
@keyframes bounce { 0%,100%{transform:translateY(0)} 40%{transform:translateY(-12px)} }

.bubble {
  background: var(--kids-card); border: 2px solid var(--kids-border);
  border-radius: 18px 18px 18px 4px; padding: 14px 16px;
  font-size: 1.05rem; line-height: 1.6; color: var(--kids-ink);
  box-shadow: 0 2px 8px rgba(46,125,50,.1); flex: 1;
  position: relative;
}
.bubble::before {
  content:""; position: absolute; left:-10px; bottom:14px;
  border: 6px solid transparent; border-right-color: var(--kids-border);
}
.bubble::after {
  content:""; position: absolute; left:-7px; bottom:15px;
  border: 5px solid transparent; border-right-color: var(--kids-card);
}

/* ── Teacher note ─────────────────────────────────────── */
.teacher-note {
  display: none; background: var(--kids-teacher-bg); color: var(--kids-teacher);
  border-left: 4px solid var(--kids-teacher); border-radius: 0 8px 8px 0;
  padding: 10px 14px; font-size: .82rem; margin-top: 8px; line-height: 1.5;
}
body.teacher-mode .teacher-note { display: block; }

/* ── Big action btns ──────────────────────────────────── */
.k-btn {
  display: flex; align-items: center; justify-content: center; gap: 10px;
  width: 100%; min-height: 52px; padding: 14px 18px;
  background: var(--kids-green); color: #fff;
  border: none; border-radius: 14px; font-size: 1.05rem; font-weight: 700;
  cursor: pointer; font-family: inherit; box-shadow: 0 3px 10px rgba(46,125,50,.25);
  transition: transform .12s; text-decoration: none; text-align: center;
}
.k-btn:active { transform: scale(.97); }
.k-btn.outline {
  background: #fff; color: var(--kids-green); border: 2px solid var(--kids-green); box-shadow: none;
}
.k-btn.amber { background: var(--kids-amber); color: var(--kids-amber-ink); box-shadow: 0 3px 10px rgba(180,83,9,.2); }
.k-btn .ico { font-size: 1.4rem; }

/* ── Info chips ───────────────────────────────────────── */
.info-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  background: #fff; border: 1.5px solid var(--kids-border); border-radius: 999px;
  padding: 6px 14px; font-size: .88rem; color: var(--kids-muted); font-weight: 600;
}
.chip strong { color: var(--kids-ink); }

/* ── Quiz ─────────────────────────────────────────────── */
#quiz-section { background: var(--kids-card); border: 2px solid var(--kids-border); border-radius: 16px; padding: 18px 16px; }
.quiz-q { font-size: 1.05rem; font-weight: 700; margin-bottom: 12px; line-height: 1.5; }
.quiz-opts { display: flex; flex-direction: column; gap: 8px; }
.quiz-opt {
  background: var(--kids-bg); border: 2px solid var(--kids-border); border-radius: 10px;
  padding: 12px 16px; font-size: 1rem; cursor: pointer; font-family: inherit;
  text-align: left; font-weight: 600; color: var(--kids-ink);
  transition: border-color .15s, background .15s;
}
.quiz-opt:hover { border-color: var(--kids-green); background: #f9fbe7; }
.quiz-opt.correct { background: #e8f5e9; border-color: var(--kids-quiz-ok); color: var(--kids-quiz-ok); }
.quiz-opt.wrong   { background: #ffebee; border-color: var(--kids-quiz-err); color: var(--kids-quiz-err); }
.quiz-result { margin-top: 10px; font-weight: 700; font-size: 1rem; min-height: 24px; }
.quiz-result.ok  { color: var(--kids-quiz-ok); }
.quiz-result.err { color: var(--kids-quiz-err); }
.quiz-progress { font-size: .82rem; color: var(--kids-muted); margin-bottom: 10px; }
#quiz-next {
  margin-top: 12px; display: none;
  background: var(--kids-green); color: #fff; border: none; border-radius: 10px;
  padding: 12px 24px; font-size: 1rem; font-weight: 700; cursor: pointer; font-family: inherit;
  width: 100%;
}

/* ── Badge ────────────────────────────────────────────── */
#badge-section {
  display: none; text-align: center;
  background: linear-gradient(135deg, #fff8e1, #fce4ec);
  border: 2px solid #ffcc02; border-radius: 20px; padding: 28px 20px;
}
.badge-icon { font-size: 5rem; line-height: 1; margin-bottom: 8px; }
.badge-title { font-size: 1.6rem; font-weight: 900; color: #e65100; }
.badge-sub { color: var(--kids-muted); margin-top: 6px; font-size: .95rem; }

/* ── Confetti ─────────────────────────────────────────── */
.confetti-piece {
  position: fixed; top: -10px; pointer-events: none; z-index: 9999;
  border-radius: 3px; animation: confetti-fall linear forwards;
}
@keyframes confetti-fall {
  to { transform: translateY(105vh) rotate(720deg); opacity: 0; }
}

/* ── Loading / Error ──────────────────────────────────── */
.kb-center { text-align: center; padding: 40px 20px; color: var(--kids-muted); }
.kb-spinner {
  width: 44px; height: 44px; border: 4px solid var(--kids-border);
  border-top-color: var(--kids-green); border-radius: 50%;
  animation: spin .8s linear infinite; margin: 0 auto 16px;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Search ───────────────────────────────────────────── */
.k-search-wrap { position: relative; }
#kb-q {
  width: 100%; padding: 14px 50px 14px 16px; font-size: 1.05rem;
  border: 2px solid var(--kids-green); border-radius: 14px;
  background: #fff; color: var(--kids-ink); outline: none; font-family: inherit;
}
#kb-go { position: absolute; right: 10px; top: 50%; transform: translateY(-50%);
  background: none; border: none; font-size: 1.6rem; cursor: pointer; }