:root {
  --bg: #f4f7fb;
  --text: #1f2937;
  --muted: #4b5563;
  --correct: #16a34a;
  --incorrect: #dc2626;
  --next: #2563eb;
  --next-fg: #ffffff;
  --next-glow: rgba(37, 99, 235, 0.25);
  --key-bg: #ffffff;
  --key-border: #cbd5e1;
  --key-text: #334155;
  --zone-l: #93c5fd;
  --zone-r: #86efac;
  --char-pending: #94a3b8;
  --char-space-bg: #eef2f7;
  --hand-l-fill: rgba(37, 99, 235, 0.16);
  --hand-l-stroke: rgba(37, 99, 235, 0.55);
  --hand-r-fill: rgba(22, 163, 74, 0.16);
  --hand-r-stroke: rgba(22, 163, 74, 0.55);
  --hand-active-fill: rgba(245, 158, 11, 0.85);
  --hand-active-stroke: #b45309;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.site-header { text-align: center; padding: 1.25rem 1rem 0.5rem; }
.site-header h1 { margin: 0; font-size: 1.5rem; }
.site-subtitle { margin: 0.25rem 0 0; color: var(--muted); }

#app { max-width: 900px; margin: 0 auto; padding: 1rem; }

.activity-space { display: flex; flex-direction: column; gap: 1.5rem; }

.activity-layer {
  min-height: 120px;
  padding: 1rem;
  background: var(--key-bg);
  border: 1px solid var(--key-border);
  border-radius: 12px;
}

.passage {
  font-size: 1.4rem;
  line-height: 1.8;
  white-space: pre-wrap;
  word-break: break-word;
  user-select: none;
}

.char { color: var(--char-pending); }
.char.correct { color: var(--correct); }
.char.incorrect { color: var(--incorrect); text-decoration: underline; }
.char.caret { border-left: 2px solid var(--next); margin-left: -2px; }
.char.space { background: var(--char-space-bg); border-radius: 3px; }

.instruction {
  font-size: 1.05rem;
  color: var(--muted);
  margin-bottom: 0.75rem;
  padding: 0.6rem 0.8rem;
  background: #eef2ff;
  border-left: 4px solid var(--next);
  border-radius: 6px;
}

.new-keys {
  font-size: 0.85rem;
  color: #4338ca;
  margin-bottom: 0.75rem;
}

.done { text-align: center; padding: 1rem; }
.done h2 { margin: 0 0 0.5rem; }
.done p { margin: 0.25rem 0; }
.done .hint { color: var(--muted); font-size: 0.85rem; }

.keyboard-space { position: relative; }

.board { position: relative; margin: 0 auto; }

.keyboard { position: absolute; top: 0; left: 0; }

.key {
  position: absolute;
  height: 52px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--key-border);
  border-radius: 8px;
  background: var(--key-bg);
  font-size: 15px;
  color: var(--key-text);
  user-select: none;
  transition: background 0.08s, box-shadow 0.08s, transform 0.08s;
}

.key-legend-top {
  font-size: 10px;
  line-height: 1.15;
  opacity: 0.8;
}
.key-legend-bottom {
  font-size: 15px;
  line-height: 1.15;
}

.key.hand-l { border-bottom: 3px solid var(--zone-l); }
.key.hand-r { border-bottom: 3px solid var(--zone-r); }

.key.next {
  background: var(--next);
  color: var(--next-fg);
  box-shadow: 0 0 0 3px var(--next-glow);
  transform: translateY(-2px);
}

.hands {
  position: absolute;
  top: 0;
  left: 0;
  pointer-events: none;
}

.finger, .palm, .thumb {
  fill: var(--hand-l-fill);
  stroke: var(--hand-l-stroke);
  stroke-width: 1;
  transition: fill 0.1s;
}

.finger[data-hand="right"], .palm[data-hand="right"], .thumb[data-hand="right"] {
  fill: var(--hand-r-fill);
  stroke: var(--hand-r-stroke);
}

.finger.active, .thumb.active {
  fill: var(--hand-active-fill);
  stroke: var(--hand-active-stroke);
  stroke-width: 2;
}

:root {
  --star: #f59e0b;
}

.result-card {
  text-align: center;
  padding: 0.5rem;
}

.result-card h2 { margin: 0 0 0.5rem; }

.stars {
  font-size: 2rem;
  letter-spacing: 0.1em;
  color: var(--star);
  margin: 0.5rem 0;
}

.result-card dl {
  display: grid;
  grid-template-columns: auto auto;
  gap: 0.25rem 1rem;
  justify-content: center;
  margin: 0.75rem 0;
  font-size: 1.05rem;
}

.result-card dt { text-align: right; color: var(--muted); }
.result-card dd { margin: 0; text-align: left; font-weight: 600; }
.result-card .hint { color: var(--muted); }

.btn {
  margin-top: 0.75rem;
  padding: 0.5rem 1.25rem;
  font-size: 1rem;
  border: none;
  border-radius: 8px;
  background: var(--next);
  color: var(--next-fg);
  cursor: pointer;
}

.btn:hover { opacity: 0.9; }

:root {
  --fixed: #f97316;
}

.char.fixed { color: var(--fixed); }

:root {
  --card-bg: #ffffff;
  --card-border: #e2e8f0;
  --card-shadow: rgba(15, 23, 42, 0.08);
  --tag-bg: #eef2ff;
  --tag-text: #4338ca;
}

.app-shell { max-width: 900px; margin: 0 auto; }

.screen-title { text-align: center; margin: 0.5rem 0 1rem; }

.back-btn {
  background: transparent;
  color: var(--next);
  border: 1px solid var(--next);
  padding: 0.35rem 0.85rem;
  border-radius: 8px;
  font-size: 0.9rem;
  cursor: pointer;
  margin-bottom: 0.5rem;
}

.back-btn:hover { background: var(--next); color: var(--next-fg); }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
}

.card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.25rem;
  padding: 1rem;
  border: 1px solid var(--card-border);
  border-radius: 12px;
  background: var(--card-bg);
  color: var(--text);
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: transform 0.1s, box-shadow 0.1s;
}

.card:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--card-shadow);
}

.card.disabled { opacity: 0.55; cursor: not-allowed; }

.card-icon { font-size: 2rem; }
.card-number {
  font-size: 1.5rem;
  font-weight: 800;
  line-height: 1;
  color: var(--next);
}
.card-title { font-size: 1.1rem; font-weight: 700; }
.card-subtitle { color: var(--muted); font-size: 0.9rem; }
.card-description { color: var(--muted); font-size: 0.85rem; }

.card-stars {
  color: var(--star);
  font-size: 1rem;
  letter-spacing: 0.05em;
}

.card-tag {
  background: var(--tag-bg);
  color: var(--tag-text);
  font-size: 0.75rem;
  padding: 0.1rem 0.55rem;
  border-radius: 999px;
}

.top-bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 0.75rem;
  margin-bottom: 1rem;
  border: 1px solid var(--card-border);
  border-radius: 10px;
  background: var(--key-bg);
}

.top-bar-label {
  font-weight: 700;
  color: var(--muted);
  font-size: 0.9rem;
}

.top-bar-actions { display: flex; gap: 0.5rem; }

.top-btn {
  background: var(--key-bg);
  color: var(--next);
  border: 1px solid var(--next);
  border-radius: 8px;
  padding: 0.3rem 0.75rem;
  font-size: 0.9rem;
  cursor: pointer;
}

.top-btn:hover { background: var(--next); color: var(--next-fg); }

.top-bar-status {
  margin-left: auto;
  color: var(--muted);
  font-size: 0.85rem;
}

#topbar {
  background: var(--key-bg);
  border-bottom: 1px solid var(--card-border);
}

.top-bar {
  max-width: 900px;
  margin: 0 auto;
  border: none;
  border-radius: 0;
}

:root {
  --hand-outline: #475569;
  --debug-tip: #ef4444;
  --debug-pivot: #3b82f6;
}

.hand-outline { fill: transparent; stroke: var(--hand-outline); stroke-width: 1.5; opacity: 0.6; }
.end-effector { fill: var(--debug-tip); opacity: 0.6; }
.pivot-marker { fill: var(--debug-pivot); visibility: hidden; }

/* .keyboard-space needs no fixed padding — the board sizes itself. */