:root {
  color-scheme: dark;
  --bg: #0b1020;
  --panel: #141b31;
  --text: #eef2ff;
  --muted: #94a3b8;
  --accent: #6366f1;
  --accent-strong: #4f46e5;
  --danger: #f87171;
  --border: rgba(148, 163, 184, 0.18);
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at top, #172554, var(--bg) 45%);
  color: var(--text);
}

.hidden {
  display: none !important;
}

.screen {
  min-height: 100vh;
}

.panel {
  width: min(420px, calc(100vw - 2rem));
  margin: 20vh auto 0;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: 1rem;
  background: rgba(20, 27, 49, 0.92);
  backdrop-filter: blur(12px);
}

h1 {
  margin: 0 0 0.5rem;
  font-size: 1.75rem;
}

p {
  color: var(--muted);
}

input,
textarea,
button {
  font: inherit;
}

input,
textarea {
  width: 100%;
  margin-top: 1rem;
  padding: 0.85rem 1rem;
  border-radius: 0.75rem;
  border: 1px solid var(--border);
  background: #0f172a;
  color: var(--text);
}

button {
  margin-top: 1rem;
  padding: 0.85rem 1rem;
  border: 0;
  border-radius: 0.75rem;
  background: var(--accent);
  color: white;
  cursor: pointer;
}

button:hover {
  background: var(--accent-strong);
}

.error {
  color: var(--danger);
}

#chat-screen {
  display: grid;
  grid-template-rows: auto 1fr auto;
  height: 100vh;
  max-width: 900px;
  margin: 0 auto;
}

header,
footer {
  padding: 1rem;
  border-bottom: 1px solid var(--border);
  background: rgba(11, 16, 32, 0.85);
}

footer {
  border-bottom: 0;
  border-top: 1px solid var(--border);
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

header h1 {
  font-size: 1.25rem;
}

#logout-btn {
  margin: 0;
  background: transparent;
  border: 1px solid var(--border);
}

#messages {
  overflow: auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.message {
  max-width: 85%;
  padding: 0.85rem 1rem;
  border-radius: 1rem;
  line-height: 1.5;
  white-space: pre-wrap;
}

.message.user {
  align-self: flex-end;
  background: var(--accent);
}

.message.assistant {
  align-self: flex-start;
  background: rgba(20, 27, 49, 0.95);
  border: 1px solid var(--border);
}

.message.assistant.error {
  color: var(--danger);
  border-color: rgba(248, 113, 113, 0.35);
  background: rgba(127, 29, 29, 0.18);
}

.actions {
  display: flex;
  gap: 0.75rem;
}

.actions button {
  flex: 1;
  margin-top: 0.75rem;
}

#mic-btn.listening {
  background: var(--danger);
}

@media (min-width: 768px) {
  #chat-screen {
    border-left: 1px solid var(--border);
    border-right: 1px solid var(--border);
  }
}