:root {
  --bg: #f7f7f8;
  --surface: #ffffff;
  --surface-2: #f1f2f4;
  --text: #15171a;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --accent: #2563eb;
  --accent-soft: #dbeafe;
  --success: #10b981;
  --error: #ef4444;
  --error-bg: #fee2e2;

  /* finger colors — soft, distinct, work in light & dark */
  --f-pinky-l: #f87171;
  --f-ring-l: #fb923c;
  --f-middle-l: #facc15;
  --f-index-l: #4ade80;
  --f-thumb: #a1a1aa;
  --f-index-r: #34d399;
  --f-middle-r: #38bdf8;
  --f-ring-r: #818cf8;
  --f-pinky-r: #c084fc;

  --radius: 12px;
  --radius-sm: 8px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.06);
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Inter, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --surface: #171a1f;
    --surface-2: #1f232a;
    --text: #e7e9ee;
    --text-muted: #8b94a3;
    --border: #2a2f37;
    --accent: #60a5fa;
    --accent-soft: #1e3a8a;
    --error-bg: #3f1d1d;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 18px rgba(0, 0, 0, 0.35);
  }
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  line-height: 1.5;
}

button { font-family: inherit; }

kbd {
  font-family: var(--mono);
  font-size: 0.85em;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 6px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 18px;
  letter-spacing: -0.01em;
}
.brand-mark { font-size: 22px; }

.mode-toggle {
  display: inline-flex;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px;
}
.mode-btn {
  border: 0;
  background: transparent;
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}
.mode-btn:hover { color: var(--text); }
.mode-btn.is-active {
  background: var(--surface);
  color: var(--text);
  box-shadow: var(--shadow-sm);
}

.app {
  max-width: 920px;
  margin: 0 auto;
  padding: 32px 24px 64px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
.stat {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  text-align: center;
  box-shadow: var(--shadow-sm);
}
.stat-value {
  font-family: var(--mono);
  font-size: 26px;
  font-weight: 600;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}
.stat-value .unit {
  font-size: 14px;
  color: var(--text-muted);
  margin-left: 2px;
  font-weight: 500;
}
.stat-label {
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: 2px;
}

.lesson-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.lesson-label {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
}
.lesson-select {
  font-family: inherit;
  font-size: 14px;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  min-width: 220px;
}
.lesson-hint {
  font-size: 13px;
  color: var(--text-muted);
}

.typing-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 32px;
  box-shadow: var(--shadow-md);
}

.text-display {
  font-family: var(--mono);
  font-size: 22px;
  line-height: 1.7;
  color: var(--text-muted);
  outline: none;
  user-select: none;
  white-space: pre-wrap;
  word-break: break-word;
  letter-spacing: 0.01em;
  min-height: 4lh;
}
.text-display:focus-visible { outline: 2px solid var(--accent); outline-offset: 6px; border-radius: 4px; }

.text-display .ch.done { color: var(--text); }
.text-display .ch.bad {
  color: var(--error);
  background: var(--error-bg);
  border-radius: 2px;
}
.text-display .ch.bad-space {
  background: var(--error-bg);
  border-radius: 2px;
}
.text-display .ch.cursor {
  position: relative;
  color: var(--text);
}
.text-display .ch.cursor::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 0.1em;
  bottom: 0.1em;
  width: 2px;
  background: var(--accent);
  animation: blink 1s step-end infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.hint {
  margin: 16px 0 0;
  font-size: 13px;
  color: var(--text-muted);
}

.keyboard-wrap {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
  width: 100%;
  overflow-x: auto;
}
.keyboard {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  flex: 0 0 auto;
}
.kb-row {
  display: flex;
  gap: 6px;
  justify-content: center;
}
.key {
  --finger: var(--f-thumb);
  position: relative;
  display: inline-flex;
  align-items: flex-end;
  justify-content: flex-start;
  width: 38px;
  height: 38px;
  padding: 4px 6px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-bottom: 2px solid var(--border);
  border-radius: 6px;
  user-select: none;
  transition: transform 0.06s ease, background 0.15s ease, border-color 0.15s ease;
}
.key::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 5px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--finger);
  opacity: 0.85;
}
.key.wide { width: 60px; }
.key.xwide { width: 76px; }
.key.space { width: 260px; height: 32px; }
.key.tab { width: 60px; }
.key.shift-l { width: 86px; }
.key.shift-r { width: 110px; }
.key.enter { width: 90px; }
.key.bksp { width: 76px; }

.key.next {
  background: var(--accent-soft);
  border-color: var(--accent);
  transform: translateY(-1px);
}
.key.pressed {
  transform: translateY(1px);
  background: var(--surface);
}

.finger-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 18px;
  font-size: 12px;
  color: var(--text-muted);
  justify-content: center;
}
.legend-item { display: inline-flex; align-items: center; gap: 6px; }
.dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.dot.f-pinky-l { background: var(--f-pinky-l); }
.dot.f-ring-l { background: var(--f-ring-l); }
.dot.f-middle-l { background: var(--f-middle-l); }
.dot.f-index-l { background: var(--f-index-l); }
.dot.f-thumb { background: var(--f-thumb); }
.dot.f-index-r { background: var(--f-index-r); }
.dot.f-middle-r { background: var(--f-middle-r); }
.dot.f-ring-r { background: var(--f-ring-r); }
.dot.f-pinky-r { background: var(--f-pinky-r); }

.controls {
  display: flex;
  gap: 10px;
  justify-content: center;
}
.btn {
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 18px;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.06s ease;
}
.btn:hover { background: var(--surface-2); }
.btn:active { transform: translateY(1px); }
.btn-primary {
  color: white;
  background: var(--accent);
  border-color: var(--accent);
}
.btn-primary:hover { filter: brightness(1.05); background: var(--accent); }

.results::backdrop { background: rgba(15, 23, 42, 0.4); }
.results {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0;
  background: var(--surface);
  color: var(--text);
  max-width: 440px;
  width: calc(100% - 32px);
  box-shadow: var(--shadow-md);
}
.results-inner { padding: 24px; }
.results-title {
  margin: 0 0 16px;
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.results-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-bottom: 16px;
}
.results-grid > div {
  background: var(--surface-2);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  text-align: center;
}
.r-value {
  font-family: var(--mono);
  font-size: 22px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}
.r-label {
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: 2px;
}
.results-feedback {
  margin: 0 0 18px;
  font-size: 14px;
  color: var(--text-muted);
}
.results-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  padding: 0;
  margin: 0;
}

@media (max-width: 720px) {
  .app { padding: 20px 16px 40px; }
  .typing-card { padding: 20px; }
  .text-display { font-size: 18px; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .key { width: 30px; height: 32px; font-size: 11px; }
  .key.wide { width: 46px; }
  .key.xwide { width: 60px; }
  .key.space { width: 180px; }
  .key.shift-l { width: 60px; }
  .key.shift-r { width: 80px; }
  .key.enter { width: 64px; }
  .key.bksp { width: 56px; }
  .key.tab { width: 46px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}