/* ============================================================
   線刻 (Senkoku) − 運筆道場
   Palette: 和紙 × 墨 × 朱(先生の添削印の色)
   ============================================================ */
:root {
  --paper: #F6F1E4;
  --paper-deep: #ECE4D0;
  --ink: #221F1A;
  --ink-soft: #55503F;
  --nibi: #8B8577;          /* 鈍色: guides, muted text */
  --shu: #C0392F;           /* 朱: grading / accent */
  --shu-deep: #96271F;
  --line: rgba(34, 31, 26, 0.14);
  --radius: 14px;
  --font-display: "Shippori Mincho", serif;
  --font-body: "Zen Kaku Gothic New", sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body { height: 100%; }

body {
  font-family: var(--font-body);
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(192, 57, 47, 0.045), transparent 60%),
    var(--paper);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  overscroll-behavior: none;
}

.app {
  max-width: 860px;
  margin: 0 auto;
  padding: 20px 18px calc(16px + env(safe-area-inset-bottom));
  min-height: 100%;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* ---------- Header ---------- */
.header {
  display: flex;
  justify-content: space-between;
  align-items: stretch;
  border-bottom: 2px solid var(--ink);
  padding-bottom: 14px;
}

.title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 2.6rem;
  letter-spacing: 0.35em;
  line-height: 1;
}

.subtitle {
  margin-top: 8px;
  font-size: 0.8rem;
  letter-spacing: 0.3em;
  color: var(--ink-soft);
}

.tagline {
  writing-mode: vertical-rl;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.78rem;
  letter-spacing: 0.42em;
  line-height: 2.1; /* 縦書き2行組みの行間 (落款風)。1行にするとヘッダーが間延びする */
  color: var(--nibi);
  border-left: 1px solid var(--line);
  padding-left: 12px;
}

/* ---------- Course rail ---------- */
.course-rail {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding: 2px;
  scrollbar-width: none;
}
.course-rail::-webkit-scrollbar { display: none; }

.chip {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  min-width: 76px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.45);
  font-family: var(--font-body);
  cursor: pointer;
  color: var(--ink);
  transition: border-color 0.15s, background 0.15s;
}
.chip:focus-visible { outline: 2px solid var(--shu); outline-offset: 2px; }

.chip-glyph { font-family: var(--font-display); font-size: 1.45rem; font-weight: 700; line-height: 1; }
.chip-name  { font-size: 0.68rem; letter-spacing: 0.12em; color: var(--ink-soft); }
.chip-best  { font-size: 0.66rem; color: var(--nibi); font-variant-numeric: tabular-nums; }
.chip-best.passed { color: var(--shu); font-weight: 700; }

.chip.active { border-color: var(--ink); background: #fff; }
.chip.locked { opacity: 0.45; cursor: not-allowed; }
.chip.locked .chip-glyph::after { content: " 🔒"; font-size: 0.7rem; }

/* ---------- Stage ---------- */
.stage { display: flex; flex-direction: column; gap: 12px; }

.stage-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 12px;
  flex-wrap: wrap;
}

.course-info { display: flex; align-items: center; gap: 14px; }

.course-glyph {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1;
  border: 1.5px solid var(--ink);
  border-radius: 10px;
  width: 56px; height: 56px;
  display: grid; place-items: center;
  background: #fff;
}

.course-name { font-family: var(--font-display); font-size: 1.3rem; font-weight: 700; letter-spacing: 0.14em; }
.course-desc { font-size: 0.78rem; color: var(--ink-soft); margin-top: 2px; }

.stage-tools { display: flex; gap: 8px; }

/* ---------- Buttons ---------- */
.btn {
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  padding: 9px 16px;
  border-radius: 999px;
  border: 1px solid var(--ink);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.btn:focus-visible { outline: 2px solid var(--shu); outline-offset: 2px; }
.btn-ghost { border-color: var(--line); color: var(--ink-soft); background: rgba(255,255,255,0.5); }
.btn-solid { background: var(--ink); color: var(--paper); }
.btn-shu   { background: var(--shu); border-color: var(--shu); color: #fff; }
.btn-shu:active { background: var(--shu-deep); }

/* ---------- Canvas ---------- */
.canvas-wrap {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    repeating-linear-gradient(0deg, transparent 0 34px, rgba(34,31,26,0.025) 34px 35px),
    #FDFBF4;
  box-shadow: 0 2px 14px rgba(34, 31, 26, 0.06);
  overflow: hidden;
  aspect-ratio: 4 / 3;
}

/* .canvas-wrap 内の canvas 全般 (Stage 1 の #canvas / Stage 2 の #atariCanvas) */
.canvas-wrap canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  touch-action: none;
  cursor: crosshair;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
}

.hint { font-size: 0.76rem; color: var(--nibi); text-align: center; letter-spacing: 0.04em; }

/* ---------- Result overlay ---------- */
/* .result の display:flex が hidden 属性(UAの display:none)を上書きしてしまい、
   非表示のはずのオーバーレイが canvas を覆ってペン入力を奪うバグの防止 */
[hidden] { display: none !important; }

.result {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  padding: 20px;
  background: rgba(246, 241, 228, 0.9);
  backdrop-filter: blur(3px);
  flex-wrap: wrap;
}

/* 朱印: teacher's grading stamp */
.stamp {
  width: 128px; height: 128px;
  border: 4px solid var(--shu);
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--shu);
  transform: rotate(-7deg);
  background: radial-gradient(circle at 35% 30%, rgba(192,57,47,0.08), transparent 65%);
  box-shadow: inset 0 0 0 2px rgba(192, 57, 47, 0.25);
  animation: stamp-in 0.34s cubic-bezier(0.2, 1.6, 0.4, 1) both;
}

.stamp-rank {
  font-family: var(--font-display);
  font-size: 3.4rem;
  font-weight: 800;
  line-height: 1;
}
.stamp-score {
  font-size: 0.86rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  font-variant-numeric: tabular-nums;
  margin-top: 4px;
}
.stamp-score::after { content: " 点"; font-size: 0.7em; }

@keyframes stamp-in {
  from { transform: rotate(-7deg) scale(1.7); opacity: 0; }
  to   { transform: rotate(-7deg) scale(1);   opacity: 1; }
}
@media (prefers-reduced-motion: reduce) {
  .stamp { animation: none; }
}

.result-detail { display: flex; flex-direction: column; gap: 8px; min-width: 240px; max-width: 320px; }

.meter { display: grid; grid-template-columns: 3.6em 1fr 2.6em; align-items: center; gap: 10px; }
.meter-label { font-size: 0.78rem; letter-spacing: 0.14em; color: var(--ink-soft); }
.meter-bar {
  height: 8px;
  border-radius: 999px;
  background: var(--paper-deep);
  overflow: hidden;
}
.meter-bar i {
  display: block; height: 100%;
  width: 0;
  background: var(--ink);
  border-radius: 999px;
  transition: width 0.5s ease;
}
.meter-val { font-size: 0.78rem; font-variant-numeric: tabular-nums; text-align: right; color: var(--ink-soft); }

.result-note { font-size: 0.8rem; color: var(--ink-soft); margin-top: 4px; line-height: 1.6; }

.result-actions { display: flex; gap: 10px; margin-top: 8px; }

/* ---------- Footer ---------- */
.footer {
  display: flex;
  justify-content: space-between;
  font-size: 0.7rem;
  color: var(--nibi);
  border-top: 1px solid var(--line);
  padding-top: 10px;
  letter-spacing: 0.06em;
}

/* ---------- Stage 2: 形体道場 ---------- */
.stage-link {
  display: inline-block;
  margin-top: 10px;
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--nibi);
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 14px;
  background: rgba(255, 255, 255, 0.5);
}
.stage-link:active { color: var(--ink); border-color: var(--ink-soft); }

.tabs { display: flex; gap: 8px; }
.tab {
  flex: 0 0 auto;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.2em;
  padding: 8px 22px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.5);
  color: var(--ink-soft);
}
.tab.active { background: var(--ink); color: var(--paper); border-color: var(--ink); }

.gesture-wrap {
  display: grid;
  grid-template-columns: 1fr 1.7fr;
  gap: 12px;
}
.pose-pane, .draw-pane {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #FDFBF4;
  box-shadow: 0 2px 14px rgba(34, 31, 26, 0.06);
  overflow: hidden;
  aspect-ratio: 3 / 4;
}
.pose-pane { background: repeating-linear-gradient(0deg, transparent 0 34px, rgba(34,31,26,0.025) 34px 35px), #F9F5EA; }
.pose-pane canvas, .draw-pane canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.draw-pane canvas {
  touch-action: none;
  cursor: crosshair;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
}

.timer {
  position: absolute;
  top: 8px;
  right: 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.5rem;
  font-variant-numeric: tabular-nums;
  color: var(--shu);
}

.gesture-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  background: rgba(246, 241, 228, 0.88);
  backdrop-filter: blur(3px);
}
.gesture-msg {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: 0.2em;
  color: var(--ink);
}

/* ---------- Narrow screens ---------- */
@media (max-width: 560px) {
  .title { font-size: 2rem; }
  .tagline { display: none; }
  .canvas-wrap { aspect-ratio: 1 / 1; }
  .result { gap: 16px; }
  .gesture-wrap { grid-template-columns: 1fr; }
  .pose-pane { aspect-ratio: 4 / 3; }
}