:root {
  --bg: #f4f1fd;
  --surface: #ffffff;
  --ink: #1f1a3d;
  --ink-2: #6e6893;
  --line: #e5e0f6;
  --primary: #6c5ce7;
  --primary-d: #5141cf;
  --primary-soft: #ece9ff;
  --sun: #ffc83d;
  --sun-d: #e3a600;
  --mint: #1fc794;
  --mint-d: #10a077;
  --mint-soft: #dcf7ed;
  --coral: #ff6b6b;
  --coral-d: #df4a4a;
  --coral-soft: #ffe7e7;
  --flame: #ff8a3d;
  --A: #2fbf71;
  --B: #f2545b;
  --X: #3b82f6;
  --Y: #f5b700;
  --ui: "Zen Maru Gothic", "Noto Sans CJK JP", sans-serif;
  --kanji: "Klee One", "Noto Serif CJK JP", serif;
  --u: min(0.8vw, 1.3vh); /* base unit that scales with the screen */
  --r: calc(2.4 * var(--u));
  --depth: calc(0.6 * var(--u));
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  background:
    radial-gradient(circle at 8% -5%, #ded6ff 0, transparent 38%),
    radial-gradient(circle at 100% 105%, #ffe4cf 0, transparent 40%),
    var(--bg);
  color: var(--ink);
  font-family: var(--ui);
  font-weight: 700;
  overflow: hidden;
  user-select: none;
  cursor: default;
  -webkit-font-smoothing: antialiased;
}
button { font: inherit; color: inherit; border: 0; background: none; cursor: pointer; padding: 0; }
svg.i { width: 1em; height: 1em; flex: none; }

#app { height: 100%; display: flex; flex-direction: column; }
.loading { margin: auto; font-size: calc(3 * var(--u)); color: var(--ink-2); }
.screen {
  flex: 1; min-height: 0; width: 100%; max-width: calc(130 * var(--u)); margin: 0 auto;
  display: flex; flex-direction: column; align-items: stretch;
  padding: calc(2.5 * var(--u)) calc(3 * var(--u)) calc(7 * var(--u)); gap: calc(2.2 * var(--u));
}
.screen.centered { justify-content: center; }
.screen.centered > .topbar { position: absolute; top: calc(2.5 * var(--u)); left: 50%; translate: -50% 0; width: calc(100% - 6 * var(--u)); max-width: calc(124 * var(--u)); }

/* ---------- building blocks ---------- */
.surface {
  background: var(--surface); border: 2px solid var(--line); border-radius: var(--r);
  box-shadow: 0 var(--depth) 0 var(--line);
}
.chip {
  display: inline-flex; align-items: center; gap: 0.4em;
  background: var(--surface); border: 2px solid var(--line); border-radius: 999px;
  padding: 0.35em 0.9em; font-size: calc(2.2 * var(--u)); font-weight: 900;
}
.chip small { font-size: 0.65em; color: var(--ink-2); font-weight: 700; }
.chip.flame { color: var(--flame); }
.chip.flame.off { color: var(--ink-2); }
.muted { color: var(--ink-2); }

/* controller button badges */
.btn {
  display: inline-grid; place-items: center; flex: none;
  width: 1.7em; height: 1.7em; border-radius: 50%;
  font-family: var(--ui); font-weight: 900; font-size: 0.75em; line-height: 1; color: #fff;
}
.btn-A { background: var(--A); }
.btn-B { background: var(--B); }
.btn-X { background: var(--X); }
.btn-Y { background: var(--Y); }
.btn-MENU { background: var(--ink-2); border-radius: 0.5em; width: 2.2em; }
.hints {
  position: fixed; left: 50%; bottom: calc(2 * var(--u)); translate: -50% 0;
  display: flex; gap: calc(3 * var(--u)); color: var(--ink-2); font-size: calc(1.8 * var(--u));
}
.hints > span { display: inline-flex; align-items: center; gap: 0.5em; }

.topbar { display: flex; align-items: center; gap: calc(2 * var(--u)); }
.icon-btn {
  display: grid; place-items: center; width: calc(5.5 * var(--u)); height: calc(5.5 * var(--u));
  border-radius: calc(1.6 * var(--u)); background: var(--surface); border: 2px solid var(--line);
  box-shadow: 0 calc(0.4 * var(--u)) 0 var(--line); color: var(--ink-2); font-size: calc(2.6 * var(--u));
}

/* big chunky buttons used for menus */
.big-btn {
  display: flex; align-items: center; gap: 0.6em;
  background: var(--surface); border: 2px solid var(--line); border-radius: var(--r);
  box-shadow: 0 var(--depth) 0 var(--line);
  padding: calc(2 * var(--u)) calc(3 * var(--u)); font-size: calc(3 * var(--u)); font-weight: 900;
  transition: transform 0.12s, box-shadow 0.12s, border-color 0.12s;
}
.big-btn svg.i { font-size: 1.1em; color: var(--primary); }
.big-btn small { margin-left: auto; font-size: 0.55em; color: var(--ink-2); font-weight: 700; }
.big-btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; box-shadow: 0 var(--depth) 0 var(--primary-d); }
.big-btn.primary svg.i, .big-btn.primary small { color: #fff; opacity: 0.9; }
.sel { transform: translateY(calc(-0.3 * var(--u))); outline: calc(0.5 * var(--u)) solid var(--sun); outline-offset: calc(0.4 * var(--u)); }

/* ---------- home ---------- */
.brand { display: flex; align-items: center; gap: 0.5em; font-size: calc(3.2 * var(--u)); font-weight: 900; letter-spacing: 0.04em; }
.logo {
  display: grid; place-items: center; width: 1.6em; height: 1.6em; border-radius: 0.45em;
  background: var(--primary); color: #fff; font-family: var(--kanji); font-weight: 600;
  transform: rotate(-6deg); box-shadow: 0 0.12em 0 var(--primary-d);
}
.brand + .chip { margin-left: auto; }
.chip.account { font-size: calc(1.8 * var(--u)); max-width: calc(30 * var(--u)); overflow: hidden; white-space: nowrap; }


.hero { display: flex; align-items: center; gap: calc(4 * var(--u)); padding: calc(3 * var(--u)) calc(4 * var(--u)); }
.ring { position: relative; width: calc(17 * var(--u)); height: calc(17 * var(--u)); flex: none; }
.ring svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.ring circle { fill: none; stroke-width: 10; stroke-linecap: round; }
.ring .track { stroke: var(--primary-soft); }
.ring .fill { stroke: var(--primary); transition: stroke-dasharray 1.2s ease-out; }
.ring-label { position: absolute; inset: 0; display: grid; place-content: center; text-align: center; line-height: 1; }
.ring-label small { font-size: calc(1.6 * var(--u)); color: var(--ink-2); }
.ring-label b { font-size: calc(6 * var(--u)); font-weight: 900; color: var(--primary); }
.hero-main { flex: 1; display: flex; flex-direction: column; gap: calc(1.4 * var(--u)); }
.rank { font-size: calc(3.6 * var(--u)); font-weight: 900; }
.xpbar { height: calc(1.6 * var(--u)); border-radius: 999px; background: var(--primary-soft); overflow: hidden; }
.xpbar div { height: 100%; border-radius: 999px; background: linear-gradient(90deg, var(--primary), #9b8cff); transition: width 1.2s ease-out; }
.xp-note { font-size: calc(1.8 * var(--u)); color: var(--ink-2); }
.stat-row { display: flex; gap: calc(1.5 * var(--u)); }
.stat-tile {
  flex: 1; display: flex; align-items: center; gap: 0.6em;
  background: var(--bg); border-radius: calc(1.6 * var(--u)); padding: calc(1.2 * var(--u)) calc(1.6 * var(--u));
  font-size: calc(2.6 * var(--u));
}
.stat-tile svg.i { font-size: 1.2em; }
.stat-tile b { font-weight: 900; }
.stat-tile small { display: block; font-size: 0.6em; color: var(--ink-2); font-weight: 700; }
.ico-sun { color: var(--sun-d); } .ico-mint { color: var(--mint); } .ico-flame { color: var(--flame); } .ico-primary { color: var(--primary); }

.menu { display: grid; grid-template-columns: 2fr 1fr; gap: calc(2 * var(--u)); align-items: start; }
.menu .big-btn { min-height: calc(12 * var(--u)); width: 100%; }
.start-col { display: flex; flex-direction: column; gap: calc(1.8 * var(--u)); }
.side-col { align-self: stretch; display: flex; flex-direction: column; gap: calc(1.8 * var(--u)); }
.menu .side-col .big-btn { flex: 1; min-height: 0; }

/* two-option mode switch under the start button */
.seg {
  display: grid; grid-template-columns: 1fr 1fr; gap: calc(0.6 * var(--u)); padding: calc(0.6 * var(--u));
  background: var(--surface); border: 2px solid var(--line); border-radius: 999px;
  box-shadow: 0 calc(0.4 * var(--u)) 0 var(--line); transition: transform 0.12s;
}
.seg button { border-radius: 999px; padding: calc(1 * var(--u)); font-size: calc(2.4 * var(--u)); font-weight: 900; color: var(--ink-2); transition: background 0.15s, color 0.15s; }
.seg button.on { background: var(--primary-soft); color: var(--primary); }

/* そっくり mode draws choices as SVG so real and fake kanji match exactly */
.glyph { width: 1em; height: 1em; display: block; fill: currentColor; }

/* ---------- quiz ---------- */
.steps { flex: 1; display: flex; gap: calc(0.6 * var(--u)); }
.steps span { flex: 1; height: calc(1.4 * var(--u)); border-radius: 999px; background: var(--line); transition: background 0.3s; }
.steps .ok { background: var(--mint); }
.steps .ng { background: var(--coral); }
.steps .now { background: var(--primary); }
.chip.score { color: var(--primary); }

.qcard { position: relative; flex: 1; min-height: calc(20 * var(--u)); display: flex; flex-direction: column; align-items: center; justify-content: center; gap: calc(2 * var(--u)); padding: calc(3 * var(--u)); }
.ask { font-size: calc(2 * var(--u)); color: var(--primary); background: var(--primary-soft); padding: 0.35em 1em; border-radius: 999px; }
.question-sentence { font-family: var(--kanji); font-size: calc(5 * var(--u)); line-height: 1.6; text-align: center; }
.blank { color: var(--primary); text-decoration: underline; text-decoration-thickness: 0.07em; text-underline-offset: 0.22em; padding: 0 0.08em; }
.blank.filled { color: var(--mint-d); text-decoration-color: var(--mint); }
.combo {
  position: absolute; top: calc(2 * var(--u)); right: calc(2 * var(--u));
  display: inline-flex; align-items: center; gap: 0.3em;
  background: #fff1e6; color: var(--flame); border-radius: 999px; padding: 0.3em 0.8em;
  font-size: calc(2 * var(--u)); font-weight: 900;
}
.combo.hot { animation: pulse 0.6s infinite alternate; }
@keyframes pulse { to { transform: scale(1.1); } }

.diamond {
  display: grid; gap: calc(1.2 * var(--u)); justify-content: center;
  grid-template-columns: repeat(3, calc(24 * var(--u)));
  grid-template-areas: ". Y ." "X . B" ". A .";
}
.slot-Y { grid-area: Y; } .slot-X { grid-area: X; } .slot-B { grid-area: B; } .slot-A { grid-area: A; }
.choice {
  position: relative; display: grid; place-items: center;
  background: var(--surface); border: 2px solid var(--line); border-radius: var(--r);
  box-shadow: 0 var(--depth) 0 var(--line);
  height: calc(9 * var(--u));
  transition: transform 0.12s, background 0.2s, opacity 0.2s, box-shadow 0.12s;
}
.choice .btn { position: absolute; left: calc(1.4 * var(--u)); top: 50%; transform: translateY(-50%); font-size: calc(2.2 * var(--u)); }
.choice .ch { font-family: var(--kanji); font-size: calc(5.5 * var(--u)); line-height: 1; }
.choice .mark { position: absolute; right: calc(1.4 * var(--u)); font-size: calc(3 * var(--u)); }
.choice:hover { border-color: #cfc6f3; }
.choice.correct { background: var(--mint); border-color: var(--mint); color: #fff; box-shadow: 0 var(--depth) 0 var(--mint-d); transform: scale(1.05); }
.choice.wrong { background: var(--coral); border-color: var(--coral); color: #fff; box-shadow: 0 var(--depth) 0 var(--coral-d); animation: shake 0.35s; }
.choice.dim { opacity: 0.4; }
@keyframes shake { 25% { translate: -0.4em 0; } 75% { translate: 0.4em 0; } }

/* ---------- overlays ---------- */
.overlay { position: fixed; inset: 0; background: rgba(31, 26, 61, 0.45); backdrop-filter: blur(4px); display: grid; place-items: center; z-index: 10; animation: fade 0.2s; }
@keyframes fade { from { opacity: 0; } }
.card {
  background: var(--surface); border-radius: calc(3 * var(--u)); overflow: hidden;
  width: min(92vw, calc(72 * var(--u))); text-align: center; font-size: calc(2.2 * var(--u));
  box-shadow: 0 calc(2 * var(--u)) calc(6 * var(--u)) rgba(31, 26, 61, 0.25); animation: pop 0.25s ease-out;
}
@keyframes pop { from { transform: translateY(1em) scale(0.96); opacity: 0; } }
.card-head { padding: calc(1.6 * var(--u)); font-size: 1.4em; font-weight: 900; background: var(--primary-soft); color: var(--primary); }
.card-head.bad { background: var(--coral-soft); color: var(--coral-d); }
.card-body { padding: calc(2.5 * var(--u)) calc(4 * var(--u)) calc(3 * var(--u)); display: flex; flex-direction: column; align-items: center; gap: calc(1.6 * var(--u)); }
.info { display: flex; gap: calc(4 * var(--u)); align-items: center; text-align: left; }
.info .big-kanji { font-family: var(--kanji); font-size: calc(15 * var(--u)); line-height: 1; }
.readings { display: flex; align-items: center; gap: 0.6em; margin: 0.3em 0; color: var(--ink-2); font-weight: 500; }
.readings b { display: inline-grid; place-items: center; width: 1.7em; height: 1.7em; border-radius: 0.4em; background: var(--bg); color: var(--ink); font-weight: 900; font-size: 0.85em; }
.examples { list-style: none; padding: 0; margin: 0.6em 0 0; display: flex; flex-wrap: wrap; gap: 0.5em; }
.examples li { background: var(--bg); border-radius: 0.7em; padding: 0.3em 0.7em; }
.examples .w { font-family: var(--kanji); font-size: 1.2em; margin-right: 0.4em; }
.examples .r { color: var(--primary); font-weight: 700; }
.info-sentence { font-family: var(--kanji); font-size: 1.4em; background: var(--bg); border-radius: calc(1.6 * var(--u)); padding: 0.5em 1em; }
.next {
  display: inline-flex; align-items: center; gap: 0.6em; font-weight: 900; font-size: 1.1em;
  background: var(--primary); color: #fff; padding: 0.6em 1.8em; border-radius: 999px; box-shadow: 0 var(--depth) 0 var(--primary-d);
}
.pause-menu { display: flex; flex-direction: column; gap: calc(1.6 * var(--u)); width: 100%; }

#toast {
  position: fixed; top: calc(3 * var(--u)); left: 50%; translate: -50% -150%; opacity: 0;
  display: flex; align-items: center; gap: 0.6em;
  background: var(--surface); border-radius: 999px; padding: 0.5em 1.4em;
  box-shadow: 0 calc(1 * var(--u)) calc(3 * var(--u)) rgba(31, 26, 61, 0.18);
  font-size: calc(3 * var(--u)); font-weight: 900; color: var(--mint-d);
  pointer-events: none; z-index: 20; white-space: nowrap; transition: translate 0.25s, opacity 0.25s;
}
#toast.show { opacity: 1; translate: -50% 0; }
#toast small { font-size: 0.6em; color: var(--sun-d); }

/* ---------- results ---------- */
.headline { margin: 0; text-align: center; font-size: calc(5 * var(--u)); font-weight: 900; color: var(--primary); }
.levelup { align-self: center; background: var(--sun); color: #5a3d00; border-radius: 999px; padding: 0.4em 1.4em; font-size: calc(2.8 * var(--u)); font-weight: 900; box-shadow: 0 var(--depth) 0 var(--sun-d); animation: pulse 0.5s infinite alternate; }
.xp-card { display: flex; align-items: center; gap: calc(3 * var(--u)); padding: calc(2 * var(--u)) calc(3 * var(--u)); }
.xp-card .ring { width: calc(10 * var(--u)); height: calc(10 * var(--u)); }
.xp-card .ring-label b { font-size: calc(3.6 * var(--u)); }
.xp-card > div:last-child { flex: 1; }
.round-kanji { display: flex; flex-wrap: wrap; justify-content: center; gap: calc(1.2 * var(--u)); }
.rk { background: var(--surface); border: 2px solid var(--line); border-radius: calc(1.6 * var(--u)); padding: calc(0.8 * var(--u)) calc(1.4 * var(--u)); text-align: center; }
.rk .k { font-family: var(--kanji); font-size: calc(4.5 * var(--u)); line-height: 1.15; }
.rk.up { border-color: var(--sun); background: #fff8e1; }
.stars { color: var(--sun); letter-spacing: 0.05em; font-size: calc(1.6 * var(--u)); white-space: nowrap; }
.stars .off { color: var(--line); }
.results .menu { grid-template-columns: 1fr 1fr; }

/* ---------- collection ---------- */
.title { margin: 0; font-size: calc(3.4 * var(--u)); font-weight: 900; }
.grid {
  display: grid; grid-template-columns: repeat(var(--cols), 1fr); gap: calc(1.4 * var(--u));
  overflow-y: auto; padding: calc(0.8 * var(--u)) calc(0.8 * var(--u)) calc(2 * var(--u)); --cols: 10;
}
.tile {
  background: var(--surface); border: 2px solid var(--line); border-radius: calc(1.8 * var(--u));
  box-shadow: 0 calc(0.4 * var(--u)) 0 var(--line); padding: calc(1 * var(--u)) 0; text-align: center;
  transition: transform 0.12s;
}
.tile .k { font-family: var(--kanji); font-size: calc(5 * var(--u)); line-height: 1.2; }
.tile.unseen { background: transparent; border-style: dashed; box-shadow: none; }
.tile.unseen .k { opacity: 0.3; }
.tile.mastered { background: #fff8e1; border-color: var(--sun); box-shadow: 0 calc(0.4 * var(--u)) 0 var(--sun-d); }

/* ---------- pets ---------- */
/* A pet sprite: --s is the whole-number scale, the sheet is 4 frames of 16x16. */
.pet {
  --s: 6; width: calc(16px * var(--s)); height: calc(16px * var(--s)); margin: 0 auto;
  background: url(pet-duck.png) 0 0 / calc(64px * var(--s)) calc(16px * var(--s));
  image-rendering: pixelated; animation: pet-idle 0.8s steps(4) infinite;
}
@keyframes pet-idle { to { background-position-x: calc(-64px * var(--s)); } }
.pet.asleep { animation: none; filter: saturate(0.5) brightness(0.9); opacity: 0.7; }
.pet.locked { animation: none; filter: brightness(0); opacity: 0.18; }
.zzz { position: absolute; top: 0; right: calc(0.8 * var(--u)); font-size: calc(1.8 * var(--u)); font-weight: 900; color: var(--primary); animation: pet-float 2s ease-in-out infinite; }
@keyframes pet-float { 50% { translate: 0 calc(-0.6 * var(--u)); opacity: 0.5; } }

.pet-row { grid-column: 1 / -1; color: var(--sun-d); font-size: calc(1.6 * var(--u)); margin-bottom: calc(-0.6 * var(--u)); }
.ptile {
  position: relative; background: var(--surface); border: 2px solid var(--line); border-radius: calc(1.8 * var(--u));
  box-shadow: 0 calc(0.4 * var(--u)) 0 var(--line); padding: calc(0.8 * var(--u)) 0 calc(0.6 * var(--u)); text-align: center;
  transition: transform 0.12s;
}
.ptile .name { font-size: calc(1.5 * var(--u)); line-height: 1.3; }
.ptile.locked { background: transparent; border-style: dashed; box-shadow: none; }
.ptile.locked .name { color: var(--ink-2); }
.ptile .pin { position: absolute; top: calc(0.5 * var(--u)); left: calc(0.7 * var(--u)); color: var(--sun-d); font-size: calc(2 * var(--u)); }
.pet-info { text-align: center; font-size: calc(2 * var(--u)); color: var(--ink-2); min-height: 1.5em; }

/* active pets along the bottom of the home screen */
.pet-yard {
  position: fixed; left: 0; right: 0; bottom: calc(5.5 * var(--u)); pointer-events: none;
  display: flex; justify-content: center; align-items: flex-end; gap: calc(5 * var(--u));
}
.pet-yard .pet { --s: 5; }
.yard-pet { position: relative; }
.yard-pet .zzz { right: calc(-1.5 * var(--u)); }

#pad-status { position: fixed; right: 1.2em; bottom: 1em; font-size: calc(1.5 * var(--u)); color: var(--ink-2); display: flex; align-items: center; gap: 0.4em; }
#pad-status:not(:empty)::before { content: ""; width: 0.6em; height: 0.6em; border-radius: 50%; background: var(--mint); }
#confetti { position: fixed; inset: 0; pointer-events: none; z-index: 30; }

/* ---------- portrait screens ---------- */
@media (orientation: portrait) {
  :root { --u: min(1.5vw, 1.1vh); }
  .hero { flex-direction: column; text-align: center; }
  .stat-row { flex-wrap: wrap; }
  .menu { grid-template-columns: 1fr; }
  .diamond { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .info { flex-direction: column; text-align: center; }
  .grid { --cols: 5; }
}

/* ---------- phones ---------- */
@media (max-width: 700px) {
  :root { --u: 1.9vw; }
  body { overflow: auto; }
  .diamond { grid-template-columns: 1fr 1fr; grid-template-areas: "Y B" "X A"; }
  .hints { display: none; }
}