:root {
  --ink: #1a120c;
  --paper: #f3ead8;
  --cream: #fff8ec;
  --seal: #c41e3a;
  --gold: #c4a15a;
  --indigo: #2a3a6a;
  --moss: #3d5a3a;
  --muted: #6d6254;
  --line: 2px;
  --shadow: 4px 4px 0 var(--ink);
  --shadow-sm: 2px 2px 0 var(--ink);
  --safe-t: env(safe-area-inset-top, 0px);
  --safe-b: env(safe-area-inset-bottom, 0px);
  --dock: 68px;
  --top: 60px;
  --display: "Shippori Mincho", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --sans: "IBM Plex Sans JP", "Hiragino Sans", "Noto Sans JP", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  height: 100vh;
  height: 100lvh;
  overflow: hidden;
  background: var(--paper);
}
body {
  color: var(--ink);
  font-family: var(--sans);
  background-image:
    radial-gradient(ellipse 90% 40% at 100% -10%, color-mix(in srgb, var(--seal) 10%, transparent), transparent 55%),
    linear-gradient(180deg, #f7f0e2 0%, var(--paper) 40%);
}
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
.kicker, .tiny, .chip, .pill, .stat-n, .badge {
  font-family: var(--mono);
}

#app {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
  height: 100vh;
  height: 100lvh;
  height: var(--app-h, 100lvh);
  min-width: 0;
  overflow: hidden;
  background: var(--paper);
}

.top {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: calc(8px + var(--safe-t)) 10px 8px;
  background: var(--ink);
  color: var(--paper);
  border-bottom: 6px solid var(--seal);
  min-width: 0;
}
.stamp {
  background: var(--seal);
  color: #fff8ec;
  border: var(--line) solid #8d1026;
  padding: 6px 10px 4px;
  font-family: var(--display);
  font-size: 22px;
  line-height: 1;
  letter-spacing: 0.08em;
  box-shadow: var(--shadow-sm);
}
.stamp span {
  display: block;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.22em;
  margin-top: 2px;
  opacity: .85;
}
.top-meta { display: flex; gap: 6px; align-items: center; min-width: 0; }
.pill {
  background: var(--paper);
  color: var(--ink);
  border: 2px solid var(--gold);
  padding: 4px 7px 3px;
  font-size: 11px;
  font-weight: 600;
  max-width: 28vw;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.icon-btn {
  width: 44px; height: 44px;
  background: var(--paper);
  color: var(--ink);
  border: 2px solid var(--gold);
  font-size: 20px;
  line-height: 1;
}
.icon-btn:active, .stamp:active, .hard:active, .btn:active, .chip:active {
  transform: translate(1px, 1px);
}

#stage {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 8px 10px;
  min-width: 0;
  min-height: 0;
}

.dock {
  flex: 0 0 auto;
  margin-top: auto;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  border-top: 2px solid var(--ink);
  background: var(--ink);
  padding-bottom: env(safe-area-inset-bottom, 0px);
}
.dock button {
  background: var(--ink);
  color: #d9c9a8;
  border: 0;
  border-right: 1px solid #2c241c;
  min-height: var(--dock);
  font-size: 12px;
  font-family: var(--sans);
  font-weight: 600;
}
.dock button:last-child { border-right: 0; }
.dock button.on { background: var(--seal); color: #fff8ec; }

.hard {
  background: var(--cream);
  border: var(--line) solid var(--ink);
  box-shadow: var(--shadow);
}
.block { padding: 14px; margin-bottom: 12px; }
.kicker {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin: 0 0 6px;
  color: var(--muted);
}
h1, h2, .display {
  font-family: var(--display);
  font-size: clamp(26px, 7.2vw, 40px);
  line-height: 1.15;
  margin: 0 0 8px;
  font-weight: 700;
}
h2 { font-size: clamp(20px, 5.4vw, 30px); }
.body { margin: 0; line-height: 1.65; }
.row { display: flex; gap: 8px; flex-wrap: wrap; }
.grow { flex: 1 1 auto; }
.btn {
  min-height: 48px;
  padding: 10px 12px;
  border: var(--line) solid var(--ink);
  background: var(--gold);
  box-shadow: var(--shadow-sm);
  font-size: 14px;
}
.btn.red { background: var(--seal); color: #fff; }
.btn.blue { background: var(--indigo); color: #fff; }
.btn.lime { background: var(--moss); color: #fff; }
.btn.ink { background: var(--ink); color: var(--paper); }
.btn.ghost { background: var(--cream); }
.btn:disabled { opacity: .4; }

.stats {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
  margin: 12px 0 2px;
}
.stat {
  background: var(--cream);
  border: 2px solid var(--ink);
  padding: 10px 8px 8px;
  min-height: 74px;
}
.stat-n { display: block; font-size: 26px; font-weight: 600; line-height: 1; }
.stat small { color: var(--muted); font-size: 11px; }

.levels {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 6px;
  margin-top: 12px;
}
.lv {
  border: 2px solid var(--ink);
  background: var(--cream);
  min-height: 54px;
  padding: 6px 2px 5px;
  text-align: center;
}
.lv.on { background: var(--ink); color: var(--paper); }
.lv b { display: block; font-size: 13px; font-family: var(--mono); }
.lv i { display: block; font-style: normal; font-family: var(--mono); font-size: 10px; opacity: .8; }

.list { display: grid; gap: 10px; }
.tile {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
  align-items: center;
  padding: 12px;
  text-align: left;
  width: 100%;
}
.tile .t { font-size: 20px; line-height: 1.2; font-family: var(--display); }
.tile .s { font-size: 13px; color: var(--muted); margin-top: 4px; }
.badge {
  border: 2px solid var(--ink);
  padding: 4px 7px 3px;
  font-size: 11px;
  background: var(--gold);
}

.card-stage { min-height: calc(100dvh - 200px); display: flex; flex-direction: column; }
.deck-bar {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding-bottom: 6px;
  margin-bottom: 10px;
  scrollbar-width: none;
}
.deck-bar::-webkit-scrollbar { display: none; }
.chip {
  flex: 0 0 auto;
  border: 2px solid var(--ink);
  background: var(--cream);
  min-height: 38px;
  padding: 6px 10px;
  font-size: 13px;
  font-weight: 600;
}
.chip.on { background: var(--ink); color: var(--paper); }

.flip {
  flex: 1;
  min-height: 240px;
  perspective: 900px;
  margin-bottom: 10px;
}
.flip-inner {
  height: 100%;
  min-height: 240px;
  position: relative;
  transform-style: preserve-3d;
  transition: transform .32s ease;
}
.flip.on .flip-inner { transform: rotateY(180deg); }
.face {
  position: absolute; inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  padding: 16px 14px;
  display: flex; flex-direction: column; justify-content: center; gap: 10px;
}
.face.back { transform: rotateY(180deg); background: #efe4c8; }
.face.front { background: var(--cream); }
.ja-big, .en-big {
  font-family: var(--display);
  font-size: clamp(28px, 8vw, 46px);
  line-height: 1.25;
}
.ja-big ruby rt {
  font-family: var(--sans);
  font-size: 0.38em;
  color: var(--muted);
}
.hint { color: var(--muted); font-size: 13px; margin: 0; }
.reading { margin: 0; color: var(--muted); font-size: 16px; }
.grade {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
}
.grade .btn { min-height: 48px; padding: 8px 4px; font-size: 12px; }

.shadow-play { display: grid; gap: 10px; }
.phrase {
  font-family: var(--display);
  font-size: clamp(22px, 6.2vw, 34px);
  line-height: 1.35;
}
.phrase ruby rt { font-family: var(--sans); font-size: 0.4em; color: var(--muted); }
.controls { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.rec-dot {
  display: inline-block; width: 10px; height: 10px; background: var(--seal);
  border-radius: 50%; margin-right: 6px; animation: blink 1s steps(2) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.reader { font-size: 21px; line-height: 1.9; font-family: var(--display); }
.reader .w {
  display: inline;
  border: 0;
  background: transparent;
  padding: 0 1px;
  margin: 0;
  font: inherit;
  letter-spacing: inherit;
  border-radius: 2px;
  box-shadow: none;
  min-height: 0;
}
.reader .w:active, .reader .w.on { background: #f0d27a; }
.reader .w.known { background: color-mix(in srgb, var(--moss) 28%, var(--cream)); }
.reader p { margin: 0 0 1em; }
.text-meta { display: flex; justify-content: space-between; align-items: center; gap: 8px; margin-bottom: 8px; }

.sheet { position: fixed; inset: 0; z-index: 40; }
.sheet-scrim { position: absolute; inset: 0; background: rgba(26,18,12,.5); }
.sheet-panel {
  position: absolute; left: 0; right: 0; bottom: 0;
  background: var(--cream);
  border-top: 6px solid var(--seal);
  padding: 8px 16px calc(20px + var(--safe-b));
  max-height: 78dvh;
  overflow: auto;
}
.sheet-handle { width: 52px; height: 6px; background: var(--ink); margin: 4px auto 8px; }
.sheet-x {
  position: absolute; top: 10px; right: 10px;
  width: 40px; height: 40px;
  border: 2px solid var(--ink);
  background: var(--gold);
  box-shadow: var(--shadow-sm);
}
#sheet-body { padding-right: 44px; padding-top: 4px; }
.ipa { color: var(--muted); font-size: 15px; margin: 0; }

#update-bar {
  position: fixed;
  left: 10px;
  right: 10px;
  bottom: calc(var(--dock) + var(--safe-b) + 10px);
  z-index: 45;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  background: var(--gold);
  border: var(--line) solid var(--ink);
  box-shadow: var(--shadow);
  padding: 10px 10px 10px 12px;
  font-family: var(--sans);
  font-weight: 600;
}
#update-bar[hidden] { display: none !important; }
#update-bar .btn { min-height: 40px; padding: 6px 12px; flex: 0 0 auto; }

.home-play, .card-stage, .shadow-play, .read-play, .kana-play {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.home-play { overflow: auto; }
.home-play > .block { flex: 0 0 auto; margin-bottom: 0; }
.home-play .list {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.home-play .tile { flex: 1 1 0; min-height: 56px; }
.filters { flex: 0 0 auto; display: flex; flex-direction: column; gap: 5px; }
.fill-card {
  overflow: hidden;
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
}
.flip.hard {
  overflow: hidden;
  padding: 0;
  flex: 1 1 auto;
  min-height: 0;
  margin: 0 4px 4px 0;
}
.kana-play { overflow: auto; }
.dock-row { flex: 0 0 auto; flex-wrap: nowrap; }
.shadow-play .controls { margin-top: auto; }
.read-play .fill-card { overflow: auto; }
#toast {
  position: fixed; left: 12px; right: 12px; bottom: calc(var(--dock) + var(--safe-b) + 12px);
  background: var(--ink); color: var(--paper);
  border: var(--line) solid var(--ink);
  padding: 12px 14px;
  z-index: 50;
  font-size: 14px;
}

.form { display: grid; gap: 10px; }
.form label { font-size: 12px; color: var(--muted); }
.form select, .form input, .form textarea {
  min-height: 48px;
  border: 2px solid var(--ink);
  background: #fff;
  padding: 8px 10px;
  width: 100%;
  font-family: var(--sans);
}
.form textarea { min-height: 88px; resize: vertical; }
.empty { padding: 24px 14px; }
.tiny { font-size: 12px; color: var(--muted); margin: 0; }
hr.rule { border: 0; border-top: 2px solid var(--ink); margin: 14px 0; }

@media (prefers-reduced-motion: reduce) {
  .flip-inner { transition: none; }
  .rec-dot { animation: none; }
}

.kana-grid {
  display: grid;
  grid-template-columns: 22px repeat(5, 1fr);
  gap: 4px;
}
.kana-grid.combo { grid-template-columns: 28px repeat(3, 1fr); }
.kana-grid .lab {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--muted);
  align-self: center;
}
.kcell {
  min-height: 52px;
  border: 2px solid var(--ink);
  background: var(--cream);
  padding: 4px 2px 2px;
  text-align: center;
}
.kcell.empty { visibility: hidden; }
.kcell.on { background: var(--ink); color: var(--paper); }
.kcell.known { background: color-mix(in srgb, var(--moss) 28%, var(--cream)); }
.kcell .k { display: block; font-family: var(--display); font-size: 22px; line-height: 1.1; }
.kcell .r { display: block; font-family: var(--mono); font-size: 10px; opacity: .75; }
.kana-quiz {
  min-height: 160px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 8px;
}
.kana-quiz .big {
  font-family: var(--display);
  font-size: clamp(64px, 22vw, 96px);
  line-height: 1;
}
.choices { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.choices .btn { font-family: var(--mono); text-transform: none; font-size: 18px; }
.choices .btn.ok { background: var(--moss); color: #fff; }
.choices .btn.no { background: var(--seal); color: #fff; }