/* 民國教育委員會 — 網頁版 (responsive, mobile-first) */
:root {
  --bg: #141826;
  --bg-2: #1c2138;
  --panel: #232a45;
  --panel-2: #2b3357;
  --ink: #f2f4ff;
  --ink-dim: #aab2d8;
  --pink: #ff5aa2;
  --cyan: #35e0e6;
  --yellow: #ffd94a;
  --green: #4ce07a;
  --red: #ff5f5f;
  --shadow: 0 10px 30px rgba(0, 0, 0, .45);
  --radius: 14px;
  --font: "PingFang TC", "Microsoft JhengHei", "Noto Sans TC", "Heiti TC", sans-serif;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font);
  background:
    radial-gradient(1200px 500px at 80% -10%, #2a2f55 0%, transparent 60%),
    radial-gradient(900px 420px at 0% 110%, #33244a 0%, transparent 55%),
    var(--bg);
  color: var(--ink);
  min-height: 100dvh;
}

.app {
  max-width: 760px;
  margin: 0 auto;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  padding: env(safe-area-inset-top) env(safe-area-inset-right)
           env(safe-area-inset-bottom) env(safe-area-inset-left);
}

/* ---------- top bar ---------- */
.topbar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px 6px;
}
.topbar__logo { width: 40px; height: 44px; image-rendering: pixelated; }
.topbar__titles { display: flex; flex-direction: column; gap: 2px; min-width: 0; flex: 1; }
.topbar__title { height: 26px; image-rendering: pixelated; max-width: 100%; object-fit: contain; object-position: left; }
.topbar__title-text { font-weight: 900; font-size: 20px; letter-spacing: 2px; color: var(--yellow);
  text-shadow: 2px 2px 0 #7a2b00; }
.topbar__sub { font-size: 10px; letter-spacing: 2px; color: var(--ink-dim); }
.icon-btn {
  background: var(--panel); color: var(--ink); border: 1px solid #3a4470;
  border-radius: 10px; width: 40px; height: 40px; font-size: 18px; cursor: pointer;
}
.icon-btn:active { transform: scale(.94); }
.lang-btn { font-weight: 900; color: var(--yellow); width: 44px; }

/* ---------- screens ---------- */
.screen { flex: 1; padding: 10px 14px 16px; display: flex; flex-direction: column; }
.screen > * { animation: fadein .28s ease; }
@keyframes fadein { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

.footbar {
  display: flex; justify-content: space-between; gap: 8px;
  padding: 6px 14px 10px; font-size: 10px; color: var(--ink-dim);
  flex-wrap: wrap;
}

/* ---------- title screen ---------- */
.hero { text-align: center; padding: 8px 0 4px; }
.hero__skyline { width: 100%; image-rendering: pixelated; border-radius: 10px; opacity: .9; }
.hero__mascot { height: 120px; image-rendering: pixelated; margin: -30px auto 0; display: block;
  filter: drop-shadow(0 8px 12px rgba(0,0,0,.5)); }
.hero__modes { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; margin-top: 6px; }
.hero__modes img { height: 22px; image-rendering: pixelated; opacity: .95; }

.menu { display: flex; flex-direction: column; gap: 12px; margin-top: 14px; }
.menu__row { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
@media (max-width: 480px) { .menu__row { grid-template-columns: 1fr; } }

.card-btn {
  display: flex; align-items: center; gap: 12px;
  background: linear-gradient(180deg, var(--panel-2), var(--panel));
  border: 1px solid #3d4776; border-radius: var(--radius);
  padding: 14px 16px; color: var(--ink); cursor: pointer; text-align: left;
  box-shadow: var(--shadow); min-height: 64px; font-family: var(--font);
}
.card-btn:active { transform: translateY(2px); }
.card-btn--primary { border-color: var(--pink); box-shadow: 0 0 0 1px var(--pink), var(--shadow); }
.card-btn__icon { font-size: 26px; width: 40px; text-align: center; flex: none; }
.card-btn__title { font-weight: 800; font-size: 17px; }
.card-btn__desc { font-size: 12px; color: var(--ink-dim); margin-top: 3px; line-height: 1.4; }

.diff-picker { display: flex; gap: 8px; margin-top: 4px; }
.diff-picker button {
  flex: 1; padding: 10px 6px; border-radius: 12px; border: 1px solid #3d4776;
  background: var(--panel); color: var(--ink-dim); cursor: pointer; font-family: var(--font);
  font-size: 13px; font-weight: 700;
}
.diff-picker button.on { color: #1a1f35; background: var(--cyan); border-color: var(--cyan); }

.stats-line { display: flex; gap: 14px; justify-content: center; margin-top: 10px;
  font-size: 12px; color: var(--ink-dim); flex-wrap: wrap; }
.stats-line b { color: var(--yellow); }

/* ---------- quiz ---------- */
.quizhead { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.quizhead__meta { flex: 1; min-width: 0; }
.quizhead__cat { font-size: 12px; color: var(--cyan); font-weight: 800; letter-spacing: 1px; }
.quizhead__num { font-size: 11px; color: var(--ink-dim); }
.quizhead__score { text-align: right; font-weight: 900; color: var(--yellow); font-size: 18px;
  font-variant-numeric: tabular-nums; }
.quizhead__score small { display: block; font-size: 9px; color: var(--ink-dim); font-weight: 400;
  letter-spacing: 1px; }

.timer { height: 10px; background: var(--bg-2); border-radius: 99px; overflow: hidden;
  border: 1px solid #3a4470; }
.timer__fill { height: 100%; width: 100%; border-radius: 99px;
  background: linear-gradient(90deg, var(--green), var(--cyan)); transition: width .2s linear; }
.timer__fill.low { background: linear-gradient(90deg, var(--red), var(--pink)); }

.question {
  background: var(--panel); border: 1px solid #3d4776; border-radius: var(--radius);
  padding: 18px 16px; font-size: 18px; line-height: 1.65; margin: 12px 0;
  box-shadow: var(--shadow); white-space: pre-wrap; min-height: 96px;
  display: flex; align-items: center;
}
@media (min-width: 560px) { .question { font-size: 20px; } }

.choices { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
@media (max-width: 560px) { .choices { grid-template-columns: 1fr; } }
.choice {
  display: flex; align-items: center; gap: 10px;
  background: var(--panel); border: 2px solid #3d4776; border-radius: 12px;
  padding: 13px 14px; color: var(--ink); font-size: 16px; cursor: pointer;
  font-family: var(--font); text-align: left; line-height: 1.45; min-height: 56px;
}
.choice__key {
  flex: none; width: 26px; height: 26px; border-radius: 8px; background: var(--bg-2);
  display: grid; place-items: center; font-size: 13px; font-weight: 900; color: var(--cyan);
  border: 1px solid #3d4776;
}
.choice.correct { border-color: var(--green); background: #173324; }
.choice.correct .choice__key { background: var(--green); color: #10281a; border-color: var(--green); }
.choice.wrong { border-color: var(--red); background: #341a1f; }
.choice.wrong .choice__key { background: var(--red); color: #2a1114; border-color: var(--red); }
.choice.dim { opacity: .55; }
.choice:disabled { cursor: default; }

.feedback {
  display: flex; align-items: center; gap: 12px; margin-top: 12px; min-height: 64px;
}
.feedback__mark { width: 54px; image-rendering: pixelated; }
.feedback__text { font-size: 14px; line-height: 1.5; color: var(--ink-dim); }
.feedback__text b { color: var(--green); }
.feedback__text .bad { color: var(--red); }
.next-btn {
  margin-left: auto; background: var(--pink); border: none; color: #2a0a18;
  font-weight: 900; font-size: 15px; padding: 12px 22px; border-radius: 12px; cursor: pointer;
  font-family: var(--font); box-shadow: 0 6px 0 #a83a68;
}
.next-btn:active { transform: translateY(3px); box-shadow: 0 3px 0 #a83a68; }

.mascot-stage { display: flex; justify-content: center; margin: 2px 0; }
.mascot-stage img { height: 92px; image-rendering: pixelated;
  filter: drop-shadow(0 6px 10px rgba(0,0,0,.45)); transition: height .2s; }

/* ---------- result ---------- */
.result { text-align: center; padding: 8px 0; }
.result img.banner { height: 54px; image-rendering: pixelated; margin: 8px auto; }
.result__score { font-size: 52px; font-weight: 900; color: var(--yellow);
  text-shadow: 3px 3px 0 #7a2b00; margin: 6px 0; font-variant-numeric: tabular-nums; }
.result__detail { color: var(--ink-dim); font-size: 14px; line-height: 1.8; }
.result__rank { margin: 12px auto; display: inline-block; background: var(--panel);
  border: 1px solid #3d4776; padding: 10px 18px; border-radius: 12px; }
.result__rank img { height: 26px; image-rendering: pixelated; display: block; margin: 0 auto 4px; }
.result__rank span { font-size: 12px; color: var(--ink-dim); }
.result__best { color: var(--pink); font-weight: 800; margin-top: 6px; }

.review { margin-top: 14px; text-align: left; }
.review details { background: var(--panel); border: 1px solid #3d4776; border-radius: 12px;
  padding: 10px 14px; margin-top: 8px; font-size: 13px; line-height: 1.6; }
.review summary { cursor: pointer; color: var(--cyan); font-weight: 700; }
.review .ok { color: var(--green); } .review .ng { color: var(--red); }

/* ---------- error screen ---------- */
.error-box {
  background: #341a1f; border: 1px solid var(--red); border-radius: var(--radius);
  padding: 18px; margin-top: 20px; font-size: 14px; line-height: 1.6;
}
.error-box h2 { margin: 0 0 8px; color: var(--red); font-size: 18px; }
.error-box code { background: rgba(0,0,0,.3); padding: 1px 6px; border-radius: 6px; font-size: 12px; }

/* ---------- toast ---------- */
.toast {
  position: fixed; left: 50%; bottom: calc(24px + env(safe-area-inset-bottom));
  transform: translateX(-50%) translateY(20px); background: #000c; color: #fff;
  padding: 10px 18px; border-radius: 99px; font-size: 13px; opacity: 0;
  transition: all .3s; pointer-events: none; max-width: 86vw; text-align: center; z-index: 99;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* keyboard hint (desktop only) */
@media (hover: hover) and (pointer: fine) {
  .kbd-hint { display: block; }
}
.kbd-hint { display: none; font-size: 11px; color: var(--ink-dim); text-align: center; margin-top: 8px; }
.kbd-hint kbd { background: var(--bg-2); border: 1px solid #3d4776; border-radius: 5px;
  padding: 0 6px; font-family: inherit; }


/* ---------- 双人对战（PK） ---------- */
.pk-head { display: flex; align-items: stretch; gap: 8px; margin-bottom: 8px; }
.pk-side {
  flex: 1; border-radius: 12px; padding: 8px 10px; text-align: center;
  background: var(--bg-2); border: 2px solid #3d4776; opacity: .5;
  transition: all .2s;
}
.pk-side--p1.on { border-color: var(--cyan); opacity: 1; box-shadow: 0 0 12px rgba(53,224,230,.35); }
.pk-side--p2.on { border-color: var(--pink); opacity: 1; box-shadow: 0 0 12px rgba(255,90,162,.35); }
.pk-side__name { font-size: 11px; font-weight: 900; letter-spacing: 2px; color: var(--ink-dim); }
.pk-side--p1.on .pk-side__name { color: var(--cyan); }
.pk-side--p2.on .pk-side__name { color: var(--pink); }
.pk-side__score { font-size: 24px; font-weight: 900; font-variant-numeric: tabular-nums; }
.pk-center { flex: 1.4; display: flex; flex-direction: column; justify-content: center; gap: 2px; text-align: center; min-width: 0; }
.pk-vs { font-weight: 900; font-size: 15px; color: var(--yellow); letter-spacing: 2px; }

.pk-choices { display: flex; flex-direction: column; gap: 6px; margin-bottom: 10px; }
.pk-choice {
  display: flex; align-items: center; gap: 10px;
  background: var(--panel); border: 1px solid #3d4776; border-radius: 10px;
  padding: 8px 12px; font-size: 14px; line-height: 1.4;
}
.pk-choice__mark { color: var(--yellow); font-weight: 900; flex: none; }
.pk-choice.correct { border-color: var(--green); background: #173324; }
.pk-choice.wrong { border-color: var(--red); background: #341a1f; }

.pk-pads { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.pk-pad {
  border: 2px solid #3d4776; border-radius: 12px; padding: 8px;
  background: var(--bg-2); opacity: .45; transition: all .2s;
}
.pk-pad.on { opacity: 1; }
#pk-pad-0.on { border-color: var(--cyan); box-shadow: 0 0 14px rgba(53,224,230,.3); }
#pk-pad-1.on { border-color: var(--pink); box-shadow: 0 0 14px rgba(255,90,162,.3); }
.pk-pad__label { display: flex; align-items: center; gap: 6px; font-size: 12px;
  font-weight: 900; color: var(--ink-dim); margin-bottom: 6px; }
.pk-pad__label img { height: 22px; image-rendering: pixelated; }
#pk-pad-0.on .pk-pad__label { color: var(--cyan); }
#pk-pad-1.on .pk-pad__label { color: var(--pink); }
.pk-pad__keys { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; }
.pk-key {
  border: 1px solid #3d4776; border-radius: 10px; background: var(--panel);
  color: var(--ink); font-size: 17px; font-weight: 900; padding: 12px 0;
  cursor: pointer; font-family: var(--font); touch-action: manipulation;
}
.pk-key:active { transform: scale(.94); }
#pk-pad-0.on .pk-key { border-color: var(--cyan); color: var(--cyan); }
#pk-pad-1.on .pk-key { border-color: var(--pink); color: var(--pink); }

.pk-final { display: flex; justify-content: center; gap: 30px; margin: 12px 0; }
.pk-final__col { display: flex; flex-direction: column; align-items: center; gap: 2px; }
.pk-final__num { font-size: 44px; font-weight: 900; font-variant-numeric: tabular-nums; }
.pk-final__label { font-size: 12px; color: var(--ink-dim); }

@media (max-width: 420px) {
  .pk-pad__keys { gap: 4px; }
  .pk-key { padding: 10px 0; font-size: 15px; }
}