:root {
  --bg: #0f172a;
  --panel: #1e293b;
  --panel-2: #334155;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --accent-strong: #0ea5e9;
  --good: #22c55e;
  --bad: #ef4444;
  --warn: #f59e0b;
  --radius: 12px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  max-width: 900px;
  margin: 0 auto;
  padding: 1rem;
  gap: 1rem;
}

header {
  position: relative;
  text-align: center;
  padding: 0.5rem 0 1rem;
}

header h1 {
  margin: 0 0 0.25rem;
  font-size: 1.75rem;
  color: var(--accent);
}

.tagline {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.icon-btn {
  position: absolute;
  top: 0;
  right: 0;
  background: transparent;
  border: 1px solid var(--panel-2);
  color: var(--text);
  font-size: 1.2rem;
  padding: 0.4rem 0.6rem;
  border-radius: var(--radius);
  cursor: pointer;
}

.icon-btn:hover { background: var(--panel); }

main {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 720px) {
  main { grid-template-columns: 1.2fr 1fr; }
}

.panel {
  background: var(--panel);
  border-radius: var(--radius);
  padding: 1rem;
  min-height: 200px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.panel h2 {
  margin: 0 0 0.75rem;
  font-size: 1rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

#messages {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  min-height: 250px;
  max-height: 50vh;
}

.msg {
  padding: 0.6rem 0.85rem;
  border-radius: var(--radius);
  max-width: 85%;
  word-wrap: break-word;
}

.msg.user {
  align-self: flex-end;
  background: var(--accent-strong);
  color: white;
}

.msg.ai {
  align-self: flex-start;
  background: var(--panel-2);
}

.msg.thinking {
  align-self: flex-start;
  background: var(--panel-2);
  font-style: italic;
  color: var(--muted);
}

.status {
  margin-top: 0.75rem;
  color: var(--muted);
  font-size: 0.85rem;
  text-align: center;
  min-height: 1.2em;
}

.status.listening { color: var(--bad); font-weight: 600; }
.status.error { color: var(--bad); }

.feedback-empty { color: var(--muted); font-style: italic; }

.feedback-section { margin-bottom: 1rem; }
.feedback-section h3 {
  margin: 0 0 0.4rem;
  font-size: 0.85rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.no-errors {
  padding: 0.75rem;
  background: rgba(34, 197, 94, 0.15);
  border-left: 3px solid var(--good);
  border-radius: 6px;
  color: var(--good);
}

.corrected-line {
  padding: 0.6rem 0.75rem;
  background: rgba(56, 189, 248, 0.1);
  border-left: 3px solid var(--accent);
  border-radius: 6px;
  font-size: 1.05rem;
}

.mistake {
  padding: 0.6rem 0.75rem;
  background: rgba(239, 68, 68, 0.08);
  border-left: 3px solid var(--bad);
  border-radius: 6px;
  margin-bottom: 0.5rem;
}

.mistake .wrong {
  color: var(--bad);
  text-decoration: line-through;
  margin-right: 0.5rem;
}

.mistake .right {
  color: var(--good);
  font-weight: 600;
}

.mistake .why {
  margin-top: 0.35rem;
  color: var(--muted);
  font-size: 0.9rem;
}

footer {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 0;
}

.mic-btn {
  background: var(--accent-strong);
  color: white;
  border: none;
  border-radius: 999px;
  padding: 0.9rem 1.6rem;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  box-shadow: 0 4px 12px rgba(14, 165, 233, 0.35);
  transition: transform 0.05s, background 0.15s;
}

.mic-btn:hover { background: #0284c7; }
.mic-btn:active { transform: scale(0.98); }
.mic-btn:disabled { opacity: 0.5; cursor: not-allowed; }

.mic-btn.listening {
  background: var(--bad);
  animation: pulse 1.2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.5); }
  50% { box-shadow: 0 0 0 12px rgba(239, 68, 68, 0); }
}

.mic-icon { font-size: 1.3rem; }

.secondary-btn {
  background: transparent;
  border: 1px solid var(--panel-2);
  color: var(--text);
  padding: 0.6rem 1rem;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.9rem;
}

.secondary-btn:hover:not(:disabled) { background: var(--panel); }
.secondary-btn:disabled { opacity: 0.5; cursor: not-allowed; }

dialog {
  border: none;
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--text);
  padding: 1.5rem;
  max-width: 480px;
  width: 90%;
}

dialog::backdrop { background: rgba(0, 0, 0, 0.6); }

dialog h2 { margin-top: 0; color: var(--accent); }

dialog label {
  display: block;
  margin: 0.75rem 0;
  font-size: 0.95rem;
}

dialog label.checkbox {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

dialog input[type="url"],
dialog select {
  display: block;
  width: 100%;
  margin-top: 0.3rem;
  padding: 0.5rem 0.7rem;
  background: var(--bg);
  border: 1px solid var(--panel-2);
  color: var(--text);
  border-radius: 6px;
  font-size: 0.95rem;
}

dialog .hint {
  font-size: 0.85rem;
  color: var(--muted);
}

dialog code {
  background: var(--bg);
  padding: 0.1rem 0.3rem;
  border-radius: 4px;
  font-size: 0.85rem;
}

dialog menu {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
  margin: 1rem 0 0;
  padding: 0;
}

dialog menu button {
  padding: 0.5rem 1rem;
  border-radius: 6px;
  border: 1px solid var(--panel-2);
  background: transparent;
  color: var(--text);
  cursor: pointer;
}

dialog menu button[value="save"] {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
}