:root {
  color-scheme: dark;
  --bg: #111217;
  --panel: #1b1e27;
  --text: #e6eaf2;
  --muted: #98a2b3;
  --good: #2dc071;
  --bad: #ff6b6b;
  --accent: #4f8cff;
  --focus: #f6c177;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Consolas", "JetBrains Mono", monospace;
  background: radial-gradient(circle at top, #1a2030, var(--bg));
  color: var(--text);
  min-height: 100vh;
}

.app {
  max-width: 980px;
  margin: 0 auto;
  padding: 24px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: start;
}

.topbar h1 {
  margin: 0;
  font-size: 34px;
  letter-spacing: 0.04em;
}

.topbar p {
  margin: 8px 0 0;
  color: var(--muted);
}

.toolbar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.toolbar label {
  background: var(--panel);
  border: 1px solid #2b3140;
  border-radius: 10px;
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 5px;
  font-size: 12px;
  color: var(--muted);
}

select {
  border: 1px solid #3a4152;
  background: #202534;
  color: var(--text);
  padding: 5px 8px;
  border-radius: 6px;
}

.stats {
  margin-top: 20px;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
}

.stats div {
  background: var(--panel);
  border: 1px solid #2b3140;
  border-radius: 10px;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.label {
  font-size: 12px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.stats strong {
  font-size: 24px;
}

.lesson {
  margin-top: 18px;
  background: var(--panel);
  border: 1px solid #2b3140;
  border-radius: 12px;
  padding: 18px;
}

.lesson-text {
  margin: 0;
  line-height: 1.8;
  font-size: 28px;
  word-break: break-word;
  min-height: 140px;
  white-space: pre-wrap;
}

.char.done { color: var(--good); }
.char.now {
  color: var(--focus);
  text-decoration: underline;
  text-underline-offset: 6px;
}
.char.todo { color: #7d8597; }
.char.miss { color: var(--bad); }

.hint {
  margin: 14px 0 0;
  color: var(--muted);
}

kbd {
  border: 1px solid #3a4152;
  border-bottom-width: 2px;
  border-radius: 6px;
  padding: 2px 6px;
  font-size: 12px;
}

.panel-grid {
  margin-top: 14px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.letter-panel {
  background: var(--panel);
  border: 1px solid #2b3140;
  border-radius: 12px;
  padding: 14px 18px;
}

.letter-panel h2 {
  margin: 0 0 8px;
  font-size: 14px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.panel-note {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.weak-keys {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.key-chip {
  padding: 5px 8px;
  border-radius: 6px;
  background: #2a3142;
  border: 1px solid #3a4152;
  font-size: 14px;
}

.keyboard {
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.row {
  display: flex;
  justify-content: center;
  gap: 8px;
}

.row span {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border: 1px solid #3a4152;
  border-radius: 8px;
  background: #202534;
  color: #c0c8d9;
  transition: 140ms ease;
}

.row span.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px #4f8cff44;
  color: white;
}

.actions {
  margin-top: 18px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

button {
  padding: 10px 14px;
  border-radius: 8px;
  border: 1px solid #3a4152;
  background: #232b3a;
  color: var(--text);
  cursor: pointer;
}

button:hover { background: #2d3647; }

@media (max-width: 850px) {
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .panel-grid { grid-template-columns: 1fr; }
  .lesson-text { font-size: 22px; }
  .topbar { flex-direction: column; }
}