/* 清爽極簡浮世繪風格:和紙底、青海波紋、藍染與朱色點綴 */
:root {
  --ink: #332e29;
  --ink-soft: #6b6357;
  --paper: #faf5e6;
  --card: #fffcf2;
  --indigo: #3e5c76;
  --indigo-deep: #2c4359;
  --verm: #c1442e;
  --gold: #c9a227;
  --line: #d8cfba;
  --wash-indigo: #edf1f4;
  --wash-verm: #f8ece6;
  --wash-gold: #f3ead3;
  --nav-h: 62px;
  --serif: "Hiragino Mincho ProN", "Yu Mincho", "Noto Serif JP", "Noto Serif TC", "PingFang TC", serif;
}
* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
body {
  font-family: var(--serif);
  background: #efe9d8;
  color: var(--ink);
}
/* 青海波 (seigaiha) 底紋 */
#app {
  width: 100%; max-width: 480px; min-height: 100dvh;
  margin: 0 auto;
  background-color: var(--paper);
  background-image: url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' width='80' height='40'><defs><g id='s'><circle r='40' fill='%23faf5e6'/><circle r='38' fill='none' stroke='%233e5c76' stroke-opacity='.09' stroke-width='2.5'/><circle r='27' fill='none' stroke='%233e5c76' stroke-opacity='.09' stroke-width='2.5'/><circle r='16' fill='none' stroke='%233e5c76' stroke-opacity='.09' stroke-width='2.5'/></g></defs><use href='%23s' x='-40' y='-20'/><use href='%23s' x='40' y='-20'/><use href='%23s' x='120' y='-20'/><use href='%23s' x='0' y='0'/><use href='%23s' x='80' y='0'/><use href='%23s' x='-40' y='20'/><use href='%23s' x='40' y='20'/><use href='%23s' x='120' y='20'/><use href='%23s' x='0' y='40'/><use href='%23s' x='80' y='40'/><use href='%23s' x='-40' y='60'/><use href='%23s' x='40' y='60'/><use href='%23s' x='120' y='60'/></svg>");
  background-size: 80px 40px;
  display: flex; flex-direction: column;
  position: relative;
  box-shadow: 0 0 24px rgba(51, 46, 41, .12);
  border-top: 4px solid var(--verm);
}
/* App Bar */
.appbar {
  position: sticky; top: 0; z-index: 20;
  background: var(--card);
  border-bottom: 1.5px solid var(--line);
  padding: calc(10px + env(safe-area-inset-top)) 16px 10px;
  display: flex; align-items: center; gap: 12px;
}
.appbar img {
  width: 46px; height: 46px; border-radius: 50%;
  border: 1.5px solid var(--line); object-fit: cover; background: var(--paper);
}
.appbar .t1 { font-size: 1.2rem; font-weight: 700; letter-spacing: .14em; }
.appbar .t1 span { color: var(--verm); }
.appbar .t2 { font-size: .72rem; color: var(--ink-soft); letter-spacing: .06em; margin-top: 2px; }
.appbar .spk-test {
  margin-left: auto; border: 1.5px solid var(--line); background: var(--card);
  border-radius: 50%; width: 38px; height: 38px; font-size: 1rem; cursor: pointer;
  color: var(--indigo);
}
/* 主內容 */
main { flex: 1; padding: 16px 14px calc(var(--nav-h) + env(safe-area-inset-bottom) + 22px); }
.panel { display: none; }
.panel.active { display: block; animation: fadein .22s; }
@keyframes fadein { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; } }

/* 底部分頁列 */
.tabbar {
  position: fixed; bottom: 0; left: 50%; transform: translateX(-50%);
  width: 100%; max-width: 480px; z-index: 30;
  height: calc(var(--nav-h) + env(safe-area-inset-bottom));
  padding-bottom: env(safe-area-inset-bottom);
  background: var(--card); border-top: 1.5px solid var(--line);
  display: flex;
}
.tabbar button {
  flex: 1; border: none; background: none; cursor: pointer;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 3px;
  font-family: var(--serif); font-size: .66rem; color: var(--ink-soft);
}
.tabbar button .ico {
  font-size: 1.15rem; line-height: 1.5; width: 30px; height: 30px;
  border: 1.5px solid transparent; border-radius: 50%;
}
.tabbar button.active { color: var(--verm); }
.tabbar button.active .ico { border-color: var(--verm); color: var(--verm); }

/* 切換籤 */
.chips { display: flex; gap: 6px; overflow-x: auto; padding-bottom: 8px; margin-bottom: 10px; scrollbar-width: none; }
.chips::-webkit-scrollbar { display: none; }
.chips button {
  border: 1.5px solid var(--line); background: var(--card); border-radius: 999px;
  padding: 7px 15px; font-size: .85rem; cursor: pointer;
  white-space: nowrap; font-family: var(--serif); flex-shrink: 0; color: var(--ink);
}
.chips button.on { background: var(--indigo); border-color: var(--indigo); color: #fff; }
.chips.warm button.on { background: var(--verm); border-color: var(--verm); }

.mode-toggle { display: flex; justify-content: center; margin-bottom: 8px; }
.mode-toggle button {
  border: 1.5px solid var(--line); background: var(--card); padding: 7px 20px;
  cursor: pointer; font-family: var(--serif); font-size: .9rem; color: var(--ink);
}
.mode-toggle button:first-child { border-radius: 8px 0 0 8px; }
.mode-toggle button:last-child { border-radius: 0 8px 8px 0; border-left: none; }
.mode-toggle button.on { background: var(--indigo-deep); border-color: var(--indigo-deep); color: #fff; }

/* 熟練度圖例 */
.legend {
  display: flex; align-items: center; justify-content: center; gap: 10px;
  font-size: .68rem; color: var(--ink-soft); margin-bottom: 12px;
}
.legend i { display: inline-block; width: 16px; height: 4px; border-radius: 2px; margin-right: 3px; vertical-align: middle; }
.lv-1 { background: #cfd8e0; }
.lv-2 { background: #8fa6ba; }
.lv-3 { background: var(--indigo); }
.lv-4 { background: var(--verm); }

/* 假名格 */
.kgrid { display: grid; gap: 7px; }
.kgrid.c5 { grid-template-columns: repeat(5, 1fr); }
.kgrid.c3 { grid-template-columns: repeat(3, 1fr); }
.kgrid .cell {
  background: var(--card); border: 1.5px solid var(--line);
  border-radius: 8px; aspect-ratio: 1; display: flex; flex-direction: column;
  align-items: center; justify-content: center; cursor: pointer; user-select: none;
  position: relative; transition: border-color .15s, background .15s;
}
.kgrid.c3 .cell { aspect-ratio: 1.6; }
.kgrid .cell:active { background: var(--wash-indigo); border-color: var(--indigo); }
.kgrid .cell .k { font-size: clamp(1.2rem, 5.6vw, 1.7rem); font-weight: 700; }
.kgrid.c3 .cell .k { font-size: clamp(1.05rem, 5vw, 1.4rem); }
.kgrid .cell .r { font-size: .6rem; color: var(--ink-soft); font-family: Georgia, serif; }
.kgrid .cell .lv { position: absolute; bottom: 6px; width: 16px; height: 3px; border-radius: 2px; }
.kgrid .blank { visibility: hidden; }
.row-label {
  grid-column: 1 / -1; font-size: .72rem; color: var(--indigo);
  letter-spacing: .25em; margin-top: 6px;
}

/* 詳情彈出卡 */
.sheet-backdrop {
  position: fixed; inset: 0; background: rgba(51, 46, 41, .4); z-index: 40;
  opacity: 0; pointer-events: none; transition: opacity .25s;
}
.sheet-backdrop.open { opacity: 1; pointer-events: auto; }
.sheet {
  position: fixed; bottom: 0; left: 50%; transform: translate(-50%, 105%);
  width: 100%; max-width: 480px; z-index: 50;
  background: var(--card); border: 1.5px solid var(--line); border-bottom: none;
  border-radius: 16px 16px 0 0; padding: 14px 18px calc(20px + env(safe-area-inset-bottom));
  transition: transform .3s cubic-bezier(.2, .9, .3, 1);
  max-height: 78dvh; overflow-y: auto;
  box-shadow: 0 -8px 30px rgba(51, 46, 41, .15);
}
.sheet.open { transform: translate(-50%, 0); }
.sheet .grab { width: 40px; height: 4px; border-radius: 2px; background: var(--line); margin: 0 auto 12px; }
.sheet .row1 { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.evolve { display: flex; align-items: center; gap: 8px; }
.evolve .src {
  font-size: 1.8rem; background: var(--wash-indigo); color: var(--indigo-deep);
  border-radius: 8px; min-width: 56px; height: 56px; padding: 0 8px;
  display: flex; align-items: center; justify-content: center;
}
.evolve .arrow { font-size: 1.1rem; color: var(--verm); }
.evolve .dst { font-size: 2rem; font-weight: 700; }
.play-btn {
  border: 1.5px solid var(--indigo); background: var(--indigo); color: #fff;
  border-radius: 999px; padding: 8px 18px; font-size: .95rem;
  cursor: pointer; font-family: var(--serif); margin-left: auto;
}
.play-btn:active { opacity: .85; }
.sheet .romaji-line { margin-top: 8px; color: var(--indigo); font-size: 1.05rem; font-family: Georgia, serif; }
.sheet .note { margin-top: 10px; color: var(--ink-soft); font-size: .88rem; line-height: 1.8; }
/* 諧音口訣 */
.mnemo {
  margin-top: 12px; display: flex; gap: 10px; align-items: flex-start;
  background: var(--wash-verm); border-radius: 8px; padding: 10px 12px;
  font-size: .95rem; line-height: 1.8;
}
.mnemo .seal {
  flex-shrink: 0; width: 26px; height: 26px; border-radius: 4px;
  background: var(--verm); color: #fff; font-size: .8rem;
  display: flex; align-items: center; justify-content: center; margin-top: 4px;
}
.sheet .examples { margin-top: 12px; display: flex; flex-direction: column; gap: 7px; }
.ex {
  background: var(--paper); border-left: 3px solid var(--indigo);
  padding: 9px 12px; border-radius: 0 8px 8px 0; font-size: .88rem;
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
}
.ex .jp { font-weight: 700; }
.ex .kana-r { color: var(--indigo); font-family: Georgia, serif; font-size: .82rem; }
.ex .zh { color: var(--ink-soft); }
.ex .mini-play {
  margin-left: auto; border: 1.5px solid var(--line); background: var(--card);
  border-radius: 50%; width: 30px; height: 30px; cursor: pointer; font-size: .8rem;
  flex-shrink: 0; color: var(--indigo);
}

/* 翻卡 */
.flash-area { text-align: center; }
.flash-tip { margin-bottom: 14px; color: var(--ink-soft); font-size: .88rem; }
.flashcard { width: min(330px, 90%); height: 340px; margin: 0 auto; perspective: 1000px; cursor: pointer; }
.flashcard .inner {
  position: relative; width: 100%; height: 100%;
  transform-style: preserve-3d; transition: transform .5s;
}
.flashcard.flipped .inner { transform: rotateY(180deg); }
.flashcard .face {
  position: absolute; inset: 0; backface-visibility: hidden;
  background: var(--card); border: 1.5px solid var(--line); border-radius: 14px;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  box-shadow: 0 4px 18px rgba(51, 46, 41, .1); padding: 18px;
}
.flashcard .face::after {
  content: ""; position: absolute; top: 10px; right: 10px;
  width: 14px; height: 14px; border-radius: 3px; background: var(--verm); opacity: .85;
}
.flashcard .back { transform: rotateY(180deg); }
.flashcard .front .kanji { font-size: 4.4rem; font-weight: 700; }
.flashcard .front .hint { color: var(--ink-soft); margin-top: 16px; font-size: .82rem; letter-spacing: .15em; }
.flashcard .back .pair { font-size: 2.7rem; font-weight: 700; }
.flashcard .back .romaji { color: var(--indigo); font-size: 1.1rem; font-family: Georgia, serif; margin: 6px 0; }
.flashcard .back .mnemo { font-size: .82rem; line-height: 1.7; text-align: left; margin-top: 10px; }
.flashcard .back .note { font-size: .76rem; color: var(--ink-soft); line-height: 1.65; margin-top: 8px; }
.flash-ctrl { margin-top: 16px; display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; }
.btn {
  border: 1.5px solid var(--ink); background: var(--card); border-radius: 8px;
  padding: 10px 20px; font-size: .95rem; cursor: pointer;
  font-family: var(--serif); color: var(--ink);
}
.btn:active { background: var(--paper); }
.btn.primary { background: var(--verm); border-color: var(--verm); color: #fff; }
.btn.accent { background: var(--indigo); border-color: var(--indigo); color: #fff; }
.flash-progress { margin-top: 12px; color: var(--ink-soft); font-size: .82rem; font-family: Georgia, serif; }

/* 配對 */
.match-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; gap: 8px; }
.match-head .stat { font-size: .9rem; }
.match-tip { color: var(--ink-soft); font-size: .82rem; margin-bottom: 10px; }
.match-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.mcard {
  aspect-ratio: 3/4; border: 1.5px solid var(--indigo-deep); border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: clamp(1.2rem, 6vw, 1.7rem); font-weight: 700; cursor: pointer;
  background: var(--indigo); color: var(--indigo); user-select: none;
  transition: background .2s, color .2s; position: relative;
}
.mcard.open { background: var(--card); color: var(--ink); border-color: var(--line); }
.mcard.done { background: var(--wash-gold); color: var(--ink); border-color: var(--gold); cursor: default; }
.mcard .tag {
  position: absolute; top: 5px; left: 7px; font-size: .58rem; color: var(--ink-soft); visibility: hidden;
}
.mcard.open .tag, .mcard.done .tag { visibility: visible; }
.match-win { margin-top: 14px; text-align: center; font-size: 1rem; color: var(--indigo); }

/* 測驗、練功共用卡片 */
.quiz-box {
  background: var(--card); border: 1.5px solid var(--line); border-radius: 12px;
  padding: 22px 20px; text-align: center; box-shadow: 0 2px 12px rgba(51, 46, 41, .06);
}
.quiz-q { font-size: .95rem; color: var(--ink-soft); margin-bottom: 10px; }
.quiz-big { font-size: 3.8rem; font-weight: 700; margin-bottom: 14px; min-height: 1.2em; }
.quiz-big button.hear {
  border: 1.5px solid var(--indigo); background: var(--wash-indigo); border-radius: 50%;
  width: 80px; height: 80px; font-size: 1.8rem; cursor: pointer; color: var(--indigo);
}
.quiz-opts { display: grid; grid-template-columns: repeat(2, 1fr); gap: 9px; }
.quiz-opts button {
  border: 1.5px solid var(--line); border-radius: 8px; background: var(--card);
  font-size: 1.25rem; font-weight: 700; padding: 13px 6px; cursor: pointer;
  font-family: var(--serif); color: var(--ink);
}
.quiz-opts button:active { background: var(--wash-indigo); }
.quiz-opts button.right { background: var(--indigo); border-color: var(--indigo); color: #fff; }
.quiz-opts button.wrong { background: var(--verm); border-color: var(--verm); color: #fff; }
.quiz-meta { display: flex; justify-content: space-between; margin-bottom: 12px; font-size: .85rem; color: var(--ink-soft); }
.quiz-meta .streak { color: var(--verm); }
.quiz-result .score { font-size: 3rem; font-weight: 700; color: var(--verm); margin: 10px 0; }
.quiz-fb { min-height: 1.6em; margin-top: 10px; font-size: .9rem; }
.quiz-fb .mnemo { text-align: left; }
.quiz-range { margin: 12px 0 16px; display: flex; flex-direction: column; gap: 8px; text-align: left; }
.quiz-range label {
  display: flex; align-items: center; gap: 8px; font-size: .88rem;
  background: var(--paper); border: 1.5px solid var(--line); border-radius: 8px;
  padding: 9px 12px; cursor: pointer;
}
.quiz-range input { width: 17px; height: 17px; accent-color: var(--verm); }

/* 練功 */
.train-note { margin-top: 14px; font-size: .78rem; color: var(--ink-soft); line-height: 1.8; }
.train-stats { display: flex; justify-content: center; gap: 18px; margin: 14px 0 18px; }
.train-stats .ts { text-align: center; }
.train-stats .ts b { display: block; font-size: 1.5rem; color: var(--indigo-deep); }
.train-stats .ts span { font-size: .72rem; color: var(--ink-soft); }
.timer-track { height: 6px; background: var(--paper); border-radius: 3px; margin-bottom: 14px; overflow: hidden; border: 1px solid var(--line); }
.timer-bar { height: 100%; background: var(--indigo); border-radius: 3px; }
.timer-bar.low { background: var(--verm); }
.drill-fb { min-height: 1.4em; font-size: .9rem; margin-top: 8px; }
.weak-list { margin-top: 12px; display: flex; flex-direction: column; gap: 6px; text-align: left; }
.weak-list .wk {
  display: flex; align-items: center; gap: 10px; background: var(--paper);
  border-left: 3px solid var(--verm); border-radius: 0 8px 8px 0; padding: 8px 12px; font-size: .88rem;
}
.weak-list .wk .kk { font-size: 1.3rem; font-weight: 700; }
.weak-list .wk .rt { margin-left: auto; color: var(--ink-soft); font-family: Georgia, serif; font-size: .78rem; }

footer { text-align: center; padding: 10px 0 4px; color: #b3a98f; font-size: .68rem; }

/* ===================== 桌機版 (>=768px) ===================== */
@media (min-width: 768px) {
  #app { max-width: 960px; }
  .appbar { padding: 14px 28px; position: static; order: 0; }
  .appbar img { width: 54px; height: 54px; }
  .appbar .t1 { font-size: 1.4rem; }
  .appbar .t2 { font-size: .82rem; }

  .tabbar {
    order: 1; position: sticky; top: 0; bottom: auto; left: auto; transform: none;
    width: 100%; max-width: none; height: 52px; padding-bottom: 0;
    border-top: none; border-bottom: 1.5px solid var(--line);
    justify-content: center; gap: 6px; z-index: 25;
  }
  main { order: 2; width: 100%; max-width: 720px; margin: 0 auto; padding: 30px 24px 50px; }
  .tabbar button { flex: 0 0 auto; flex-direction: row; gap: 8px; padding: 0 20px; font-size: .92rem; }
  .tabbar button .ico { width: 26px; height: 26px; font-size: 1rem; line-height: 1.6; }
  .tabbar button.active { border-bottom: 3px solid var(--verm); }

  .kgrid { gap: 10px; }
  .kgrid .cell .k { font-size: 1.85rem; }
  .kgrid.c3 { grid-template-columns: repeat(6, 1fr); }
  .kgrid.c3 .cell .k { font-size: 1.4rem; }
  .kgrid .cell .r { font-size: .72rem; }
  .kgrid .cell:hover { background: var(--wash-indigo); border-color: var(--indigo); }
  .flashcard { width: 400px; height: 360px; }
  .match-grid { grid-template-columns: repeat(8, 1fr); }
  .quiz-opts { grid-template-columns: repeat(4, 1fr); }
  .quiz-opts button:hover { background: var(--wash-indigo); }
  .btn:hover { background: var(--paper); }
  .btn.primary:hover { background: #ad3a26; }
  .btn.accent:hover { background: var(--indigo-deep); }
  .chips button:hover { border-color: var(--indigo); }

  .sheet {
    bottom: auto; top: 50%; max-width: 560px;
    border-radius: 14px; border-bottom: 1.5px solid var(--line);
    padding-bottom: 24px;
    transform: translate(-50%, -46%); opacity: 0; pointer-events: none;
    transition: opacity .22s, transform .22s;
    box-shadow: 0 16px 50px rgba(51, 46, 41, .25);
  }
  .sheet.open { transform: translate(-50%, -50%); opacity: 1; pointer-events: auto; }
  .sheet .grab { display: none; }
}