:root {
  color-scheme: light dark;
  --bg: #111318;
  --panel: #1b1e26;
  --text: #f2f3f5;
  --muted: #9aa0ac;
  --accent: #5b9dfb;
  --good: #4cd08a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  display: flex;
  justify-content: center;
}

main {
  width: 100%;
  max-width: 480px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 16px;
  gap: 12px;
}

h1 {
  font-size: 1.1rem;
  text-align: center;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 4px 0;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.app-header h1 {
  text-align: left;
  text-transform: none;
  letter-spacing: 0.02em;
  color: var(--text);
  font-size: 1.15rem;
}

#settings-btn {
  padding: 8px 12px;
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
  border: 1px solid #2a2e38;
  font-size: 1.1rem;
  line-height: 1;
}

#settings-drawer {
  background: var(--panel);
  border-radius: 12px;
  border: 1px solid #2a2e38;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

#settings-drawer[hidden] {
  display: none;
}

.drawer-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.drawer-row[hidden] {
  display: none;
}

.drawer-row label {
  font-size: 0.8rem;
  color: var(--muted);
  white-space: nowrap;
  width: 70px;
}

.drawer-row select {
  flex: 1;
  min-width: 0;
  padding: 10px;
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  border: 1px solid #2a2e38;
  font-size: 0.95rem;
}

.drawer-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-top: 4px;
  border-top: 1px solid #2a2e38;
}

#exit-btn {
  width: 100%;
  padding: 10px 14px;
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  border: 1px solid #2a2e38;
  font-size: 0.95rem;
}

#scores {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.score-tile {
  background: var(--panel);
  border-radius: 8px;
  padding: 10px 6px;
  text-align: center;
}

.score-tile .label {
  font-size: 0.7rem;
  color: var(--muted);
  text-transform: uppercase;
}

.score-tile .value {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--good);
}

#prompt-box {
  background: var(--panel);
  border-left: 4px solid var(--accent);
  border-radius: 8px;
  padding: 12px 14px;
  font-size: 0.95rem;
  line-height: 1.4;
}

.prompt-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 4px;
}

#conversation {
  flex: 1;
  background: var(--panel);
  border-radius: 12px;
  padding: 12px;
  overflow-y: auto;
  min-height: 160px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

#conversation:empty::after {
  content: "Tap 🎙️ Voice or 💬 Text below to begin.";
  margin: auto;
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
}

.bubble {
  padding: 10px 12px;
  border-radius: 10px;
  max-width: 85%;
  line-height: 1.4;
  white-space: pre-wrap;
}

.bubble.tutor {
  background: #262b36;
  align-self: flex-start;
}

.bubble.user {
  background: var(--accent);
  color: #08131f;
  align-self: flex-end;
}

#feedback {
  background: var(--panel);
  border-radius: 12px;
  padding: 12px;
  font-size: 0.9rem;
  color: var(--muted);
}

#feedback strong {
  color: var(--text);
}

.metrics-line {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid #2a2e38;
  font-size: 0.8rem;
  letter-spacing: 0.02em;
}

.reference-line {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid #2a2e38;
  font-size: 0.8rem;
  font-style: italic;
  color: var(--accent);
}

form#turn-form {
  display: flex;
  gap: 8px;
}

#message-input {
  flex: 1;
  padding: 12px;
  border-radius: 8px;
  border: 1px solid #2a2e38;
  background: var(--panel);
  color: var(--text);
  font-size: 1rem;
}

button {
  padding: 12px 18px;
  border-radius: 8px;
  border: none;
  background: var(--accent);
  color: #08131f;
  font-weight: 600;
  font-size: 1rem;
}

button:disabled {
  opacity: 0.5;
}

.mode-tabs {
  display: flex;
  gap: 8px;
}

.tab-btn {
  flex: 1;
  padding: 10px;
  font-size: 0.9rem;
  background: var(--panel);
  color: var(--muted);
  border: 1px solid #2a2e38;
}

.tab-btn.active {
  background: var(--accent);
  color: #08131f;
  border-color: var(--accent);
}

.tab-panel[hidden] {
  display: none;
}

.voice-buttons {
  display: flex;
  gap: 8px;
}

#mic-btn {
  flex: 1;
  padding: 16px 8px;
  font-size: 1rem;
  background: #262b36;
  color: var(--text);
  border: 1px solid #2a2e38;
  user-select: none;
  touch-action: none;
}

#mic-btn.recording {
  background: #d64c4c;
  color: #fff;
}

#handsfree-btn {
  flex: 1;
  padding: 16px 8px;
  font-size: 1rem;
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
}

#handsfree-btn.active {
  background: var(--good);
  color: #08131f;
  border-color: var(--good);
}

#handsfree-btn.recording {
  background: #d64c4c;
  color: #fff;
  border-color: #d64c4c;
}

#handsfree-btn.processing {
  background: #262b36;
  color: var(--muted);
  border-color: #2a2e38;
}

#mic-status {
  min-height: 1em;
  text-align: center;
  font-size: 0.85rem;
  color: var(--muted);
}

/* Progress dashboard */

.back-link {
  display: block;
  text-align: center;
  color: var(--accent);
  text-decoration: none;
  font-size: 0.9rem;
  margin-top: -8px;
}

.drawer-actions .back-link {
  margin-top: 0;
}

#recommendation {
  font-size: 0.85rem;
  color: var(--muted);
  text-align: center;
}

#empty-state {
  background: var(--panel);
  border-radius: 12px;
  padding: 16px;
  color: var(--muted);
  text-align: center;
}

#progress-content {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

#chart-wrap {
  background: var(--panel);
  border-radius: 12px;
  padding: 12px;
}

#chart {
  width: 100%;
  height: auto;
  display: block;
}

#chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
  font-size: 0.8rem;
  color: var(--muted);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

#stats-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--panel);
  border-radius: 12px;
  overflow: hidden;
}

#stats-table th,
#stats-table td {
  padding: 10px 12px;
  text-align: left;
  font-size: 0.9rem;
}

#stats-table th {
  color: var(--muted);
  font-weight: 500;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-bottom: 1px solid #2a2e38;
}

#stats-table td:not(:first-child) {
  color: var(--good);
  font-weight: 600;
}

#summary {
  background: var(--panel);
  border-radius: 12px;
  padding: 14px;
  font-size: 0.9rem;
  display: flex;
  flex-direction: column;
  gap: 6px;
}