/* === Reset & Variables === */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg-primary: #1e1e2e;
  --bg-secondary: #181825;
  --bg-surface: #313244;
  --bg-overlay: #45475a;
  --bg-hover: #585b70;
  --text-primary: #cdd6f4;
  --text-secondary: #a6adc8;
  --text-muted: #6c7086;
  --accent: #89b4fa;
  --accent-hover: #74c7ec;
  --accent-dim: rgba(137, 180, 250, 0.1);
  --success: #a6e3a1;
  --success-dim: rgba(166, 227, 161, 0.15);
  --danger: #f38ba8;
  --danger-dim: rgba(243, 139, 168, 0.15);
  --warning: #fab387;
  --border: #313244;
  --input-bg: #11111b;
  --radius: 8px;
  --radius-sm: 4px;
  --transition: 0.15s ease;
}

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  overflow: hidden;
  font-size: 14px;
  line-height: 1.5;
}

/* === Modal === */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  z-index: 1000;
  justify-content: center;
  align-items: center;
  backdrop-filter: blur(4px);
}

.modal.active {
  display: flex;
}

.modal-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  width: 440px;
  max-width: 95vw;
  box-shadow: 0 16px 64px rgba(0, 0, 0, 0.6);
}

.modal-header {
  margin-bottom: 24px;
}

.modal-header h2 {
  font-size: 1.5rem;
  color: var(--accent);
  margin-bottom: 4px;
}

.modal-header .subtitle {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.form-row {
  display: flex;
  gap: 12px;
}

.flex-grow {
  flex: 1;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.form-group .optional {
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  color: var(--text-muted);
}

.form-group input {
  width: 100%;
  padding: 10px 12px;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 0.95rem;
  transition: border-color var(--transition);
}

.form-group input:focus {
  outline: none;
  border-color: var(--accent);
}

.form-group input::placeholder {
  color: var(--text-muted);
}

.error-text {
  color: var(--danger);
  font-size: 0.85rem;
  margin-top: 8px;
  min-height: 1.2em;
}

/* === Buttons === */
.btn {
  padding: 10px 20px;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: all var(--transition);
  color: var(--text-primary);
  background: var(--bg-surface);
  user-select: none;
}

.btn:hover {
  background: var(--bg-overlay);
}

.btn:active {
  transform: scale(0.98);
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn.primary {
  background: var(--accent);
  color: var(--bg-primary);
  width: 100%;
  padding: 12px;
  font-weight: 600;
  font-size: 1rem;
  margin-top: 8px;
}

.btn.primary:hover {
  background: var(--accent-hover);
}

.btn.small {
  padding: 6px 12px;
  font-size: 0.8rem;
}

.btn.danger {
  background: var(--danger-dim);
  color: var(--danger);
}

.btn.danger:hover {
  background: var(--danger);
  color: var(--bg-primary);
}

/* === App Layout === */
#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

/* === Header === */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 16px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  height: 48px;
  flex-shrink: 0;
}

.header-left h1 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.85rem;
}

.status {
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.status.connected {
  background: var(--success-dim);
  color: var(--success);
}

.status.disconnected {
  background: var(--danger-dim);
  color: var(--danger);
}

#current-user {
  color: var(--text-secondary);
  font-weight: 600;
}

/* === Main Content === */
main {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* === Sidebar === */
#sidebar {
  width: 260px;
  min-width: 200px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.sidebar-header {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}

.sidebar-header h3 {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--text-muted);
  font-weight: 700;
}

#channel-tree {
  flex: 1;
  overflow-y: auto;
  padding: 6px 0;
}

.sidebar-footer {
  padding: 8px 12px;
  border-top: 1px solid var(--border);
  background: var(--bg-primary);
}

.user-self-info {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
}

.self-name {
  font-weight: 600;
  color: var(--text-primary);
}

.self-status {
  color: var(--text-muted);
  font-size: 0.75rem;
}

/* === Channel Tree Items === */
.channel-item {
  display: flex;
  align-items: center;
  padding: 5px 10px;
  cursor: pointer;
  gap: 6px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: all var(--transition);
  border-left: 2px solid transparent;
}

.channel-item:hover {
  background: var(--bg-surface);
  color: var(--text-primary);
}

.channel-item.active {
  background: var(--accent-dim);
  color: var(--accent);
  border-left-color: var(--accent);
}

.channel-icon {
  font-size: 1rem;
  flex-shrink: 0;
  width: 20px;
  text-align: center;
}

.channel-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-weight: 500;
}

.user-item {
  display: flex;
  align-items: center;
  padding: 3px 10px;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: color var(--transition);
}

.user-item.talking {
  color: var(--success);
}

.user-item.self {
  color: var(--accent);
}

.user-icon {
  font-size: 0.85rem;
  flex-shrink: 0;
  width: 20px;
  text-align: center;
}

.user-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.recording-badge {
  background: var(--danger);
  color: var(--bg-primary);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 0.6rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  margin-left: auto;
}

/* === Chat Area === */
#content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--bg-primary);
}

#chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
}

.chat-welcome {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--text-muted);
  text-align: center;
}

.chat-welcome h3 {
  font-size: 1.3rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.chat-welcome p {
  font-size: 0.9rem;
}

.chat-message {
  margin-bottom: 4px;
  font-size: 0.9rem;
  line-height: 1.5;
  word-wrap: break-word;
  padding: 2px 0;
}

.chat-message:hover {
  background: rgba(255, 255, 255, 0.02);
  border-radius: var(--radius-sm);
}

.chat-message.system {
  color: var(--text-muted);
  font-size: 0.85rem;
  padding: 2px 8px;
  border-left: 2px solid var(--bg-overlay);
}

.msg-time {
  color: var(--text-muted);
  font-size: 0.7rem;
  margin-right: 8px;
  font-variant-numeric: tabular-nums;
}

.msg-sender {
  font-weight: 700;
  margin-right: 6px;
}

.msg-sender::after {
  content: ':';
  color: var(--text-muted);
}

.msg-text {
  color: var(--text-primary);
}

.chat-message.system .msg-text {
  color: inherit;
}

/* === Chat Bar === */
#chat-bar {
  display: flex;
  padding: 10px 12px;
  gap: 8px;
  border-top: 1px solid var(--border);
  background: var(--bg-secondary);
}

#chat-input {
  flex: 1;
  padding: 10px 14px;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 0.9rem;
  transition: border-color var(--transition);
}

#chat-input:focus {
  outline: none;
  border-color: var(--accent);
}

#chat-input:disabled {
  opacity: 0.4;
}

#chat-input::placeholder {
  color: var(--text-muted);
}

#chat-send-btn {
  padding: 10px 18px;
  font-weight: 600;
}

/* === Footer / Audio Controls === */
footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 6px 16px;
  flex-shrink: 0;
}

.audio-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

.separator {
  width: 1px;
  height: 24px;
  background: var(--border);
  margin: 0 4px;
}

.audio-btn {
  padding: 6px 12px;
  gap: 4px;
}

.audio-btn.active {
  background: var(--danger);
  color: var(--bg-primary);
}

.audio-btn .btn-icon {
  font-size: 1.1rem;
}

.audio-btn .btn-label {
  font-size: 0.8rem;
  font-weight: 600;
}

.voice-mode-group {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.voice-mode-group select {
  padding: 5px 8px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.8rem;
  cursor: pointer;
}

.voice-mode-group select:focus {
  outline: none;
  border-color: var(--accent);
}

.ptt-indicator {
  display: none;
  align-items: center;
  gap: 6px;
  color: var(--danger);
  font-size: 0.8rem;
  font-weight: 700;
}

.ptt-indicator.active {
  display: flex;
}

.ptt-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--danger);
  animation: pulse-dot 1s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.8); }
}

.volume-group {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
  font-size: 1rem;
}

.volume-group input[type="range"] {
  width: 80px;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--bg-overlay);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

.volume-group input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
}

.volume-group input[type="range"]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: none;
}

/* === Scrollbar === */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--bg-overlay);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* Firefox scrollbar */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--bg-overlay) transparent;
}

/* === Responsive === */
@media (max-width: 768px) {
  #sidebar {
    width: 200px;
    min-width: 160px;
  }

  .voice-mode-group label {
    display: none;
  }

  .volume-group input[type="range"] {
    width: 60px;
  }
}

@media (max-width: 480px) {
  #sidebar {
    width: 160px;
    min-width: 120px;
  }

  .audio-btn .btn-label {
    display: none;
  }

  .voice-mode-group {
    display: none;
  }
}