/* ================================================================
   XIAOZHI WEB CLIENT — STYLESHEET
   Messenger-style UI with ESP32 virtual device theming
   ================================================================ */

/* ─── CSS Custom Properties ────────────────────────────────────── */
:root {
  /* Brand Colors */
  --primary:          #0084ff;
  --primary-dark:     #0066cc;
  --primary-light:    #e8f4ff;
  --secondary:        #00c851;
  --danger:           #ff4444;
  --warning:          #ffbb33;

  /* Neutrals */
  --bg-primary:       #f0f2f5;
  --bg-secondary:     #ffffff;
  --bg-sidebar:       #ffffff;
  --bg-chat:          #f0f2f5;
  --bg-input:         #f0f2f5;

  /* Text */
  --text-primary:     #1c1e21;
  --text-secondary:   #65676b;
  --text-muted:       #8a8d91;
  --text-on-primary:  #ffffff;

  /* Message Bubbles */
  --bubble-out:       #0084ff;
  --bubble-in:        #e4e6eb;
  --bubble-out-text:  #ffffff;
  --bubble-in-text:   #1c1e21;
  --bubble-system:    #e4e6eb;

  /* Borders & Shadows */
  --border:           #e4e6eb;
  --border-focus:     #0084ff;
  --shadow-sm:        0 1px 3px rgba(0,0,0,0.12);
  --shadow-md:        0 4px 12px rgba(0,0,0,0.15);
  --shadow-lg:        0 8px 24px rgba(0,0,0,0.18);

  /* Layout */
  --sidebar-width:    320px;
  --header-height:    60px;
  --input-area-height: 80px;
  --radius-sm:        8px;
  --radius-md:        12px;
  --radius-lg:        18px;
  --radius-xl:        24px;

  /* Transitions */
  --transition:       0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ─── Dark Mode ────────────────────────────────────────────────── */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary:     #18191a;
    --bg-secondary:   #242526;
    --bg-sidebar:     #242526;
    --bg-chat:        #18191a;
    --bg-input:       #3a3b3c;
    --text-primary:   #e4e6eb;
    --text-secondary: #b0b3b8;
    --text-muted:     #8a8d91;
    --border:         #3a3b3c;
    --bubble-in:      #3a3b3c;
    --bubble-in-text: #e4e6eb;
    --bubble-system:  #3a3b3c;
  }
}

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

html {
  height: 100%;
  /* Use -webkit-fill-available on iOS to respect the browser chrome area */
  height: -webkit-fill-available;
}

body {
  height: 100%;
  height: -webkit-fill-available;
  overflow: hidden;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-primary);
  background: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
}

/* ─── App Layout ───────────────────────────────────────────────── */
.app-container {
  display: flex;
  /* Fallback for browsers without dvh support */
  height: 100vh;
  /* dvh = dynamic viewport height — shrinks when mobile browser chrome appears.
     This prevents the input area from being hidden under the address bar. */
  height: 100dvh;
  width: 100vw;
  overflow: hidden;
  position: relative;
}

/* ─── SIDEBAR ──────────────────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  max-width: var(--sidebar-width);
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  z-index: 100;
  transition: transform var(--transition);
}

/* Sidebar Header */
.sidebar-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-sidebar);
}

.device-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, #0084ff, #00c6ff);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 18px;
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
  animation: pulse-idle 3s ease-in-out infinite;
}

.device-avatar.connected {
  background: linear-gradient(135deg, #00c851, #00e676);
  animation: pulse-connected 2s ease-in-out infinite;
}

.device-avatar.listening {
  background: linear-gradient(135deg, #ff6b35, #f7c59f);
  animation: pulse-fast 0.8s ease-in-out infinite;
}

.device-avatar.speaking {
  background: linear-gradient(135deg, #7c4dff, #e040fb);
  animation: pulse-speak 1.2s ease-in-out infinite;
}

@keyframes pulse-idle {
  0%, 100% { box-shadow: 0 0 0 0 rgba(0, 132, 255, 0.4); }
  50% { box-shadow: 0 0 0 8px rgba(0, 132, 255, 0); }
}
@keyframes pulse-connected {
  0%, 100% { box-shadow: 0 0 0 0 rgba(0, 200, 81, 0.4); }
  50% { box-shadow: 0 0 0 8px rgba(0, 200, 81, 0); }
}
@keyframes pulse-fast {
  0%, 100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(255, 107, 53, 0.5); }
  50% { transform: scale(1.05); box-shadow: 0 0 0 10px rgba(255, 107, 53, 0); }
}
@keyframes pulse-speak {
  0%, 100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(124, 77, 255, 0.5); }
  50% { transform: scale(1.08); box-shadow: 0 0 0 12px rgba(124, 77, 255, 0); }
}

.device-info {
  flex: 1;
  min-width: 0;
}

.device-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.device-status {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 2px;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}
.status-dot.offline   { background: var(--text-muted); }
.status-dot.online    { background: var(--secondary); }
.status-dot.connecting { background: var(--warning); animation: blink 1s step-end infinite; }
.status-dot.listening { background: #ff6b35; animation: blink 0.6s step-end infinite; }
.status-dot.speaking  { background: #7c4dff; animation: blink 0.8s step-end infinite; }
.status-dot.error     { background: var(--danger); }

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.sidebar-settings-btn {
  background: none;
  border: none;
  cursor: pointer;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 14px;
  transition: all var(--transition);
  flex-shrink: 0;
}
.sidebar-settings-btn:hover {
  background: var(--bg-input);
  color: var(--text-primary);
  transform: rotate(45deg);
}

/* Sidebar Tabs */
.sidebar-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
  padding: 0 8px;
  gap: 2px;
}

.tab-btn {
  flex: 1;
  background: none;
  border: none;
  cursor: pointer;
  padding: 10px 8px;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 500;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  transition: all var(--transition);
  border-bottom: 2px solid transparent;
}

.tab-btn i { font-size: 14px; }

.tab-btn:hover { background: var(--bg-input); color: var(--text-primary); }
.tab-btn.active { color: var(--primary); border-bottom-color: var(--primary); }

/* Connection Card */
.connection-card {
  margin: 12px;
  padding: 10px 12px;
  background: var(--bg-input);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}

.connection-state {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
}

.session-info {
  margin-top: 6px;
  font-size: 11px;
  color: var(--text-muted);
}

.session-info code {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 10px;
  background: var(--bg-secondary);
  padding: 1px 4px;
  border-radius: 3px;
  max-width: 150px;
  display: inline-block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  vertical-align: middle;
}

/* Conversation List */
.conversation-list {
  flex: 1;
  overflow-y: auto;
  padding: 4px 8px;
}

.conv-list-header {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 8px 8px 4px;
}

.conv-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 8px;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition);
}

.conv-item:hover, .conv-item.active {
  background: var(--primary-light);
}

.conv-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, #0084ff, #00c6ff);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 16px;
  flex-shrink: 0;
}

.conv-meta { flex: 1; min-width: 0; }
.conv-name { font-size: 14px; font-weight: 600; color: var(--text-primary); }
.conv-preview {
  font-size: 12px;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-top: 2px;
}

.conv-time { font-size: 11px; color: var(--text-muted); flex-shrink: 0; }

/* Audio Meter */
.audio-meter-section {
  padding: 10px 12px;
  border-top: 1px solid var(--border);
}
.audio-meter-label {
  font-size: 11px;
  color: var(--text-secondary);
  margin-bottom: 5px;
  display: flex;
  align-items: center;
  gap: 5px;
}
.audio-meter-bar {
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}
.audio-meter-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--secondary), #69f0ae);
  border-radius: 2px;
  transition: width 0.1s ease;
}

/* ─── SETTINGS PANEL ───────────────────────────────────────────── */
.settings-panel {
  position: absolute;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100%;
  background: var(--bg-sidebar);
  z-index: 200;
  transform: translateX(-100%);
  transition: transform var(--transition);
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
}

.settings-panel.open {
  transform: translateX(0);
}

.settings-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px;
  border-bottom: 1px solid var(--border);
}

.settings-header h2 {
  font-size: 16px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-primary);
}

.close-settings-btn {
  background: none;
  border: none;
  cursor: pointer;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--transition);
}
.close-settings-btn:hover { background: var(--bg-input); color: var(--danger); }

.settings-body {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
}

.settings-section {
  margin-bottom: 20px;
}

.settings-section h3 {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  margin-bottom: 10px;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--border);
}

.form-group {
  margin-bottom: 12px;
}

.form-group label {
  display: block;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.form-group input[type="text"],
.form-group input[type="password"],
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-input);
  color: var(--text-primary);
  font-size: 13px;
  font-family: inherit;
  outline: none;
  transition: border-color var(--transition);
}

.form-group input:focus,
.form-group select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(0, 132, 255, 0.1);
}

.form-group small {
  display: block;
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 4px;
}

.checkbox-group label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 13px;
  color: var(--text-primary);
}

.checkbox-group input[type="checkbox"] {
  width: 15px;
  height: 15px;
  cursor: pointer;
  accent-color: var(--primary);
}

.settings-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--border);
}

/* ─── BUTTONS ──────────────────────────────────────────────────── */
.btn-primary {
  background: var(--primary);
  color: white;
  border: none;
  padding: 10px 16px;
  border-radius: var(--radius-md);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: all var(--transition);
}
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); }
.btn-primary:active { transform: translateY(0); }

.btn-secondary {
  background: var(--bg-input);
  color: var(--text-primary);
  border: 1px solid var(--border);
  padding: 10px 16px;
  border-radius: var(--radius-md);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: all var(--transition);
}
.btn-secondary:hover { background: var(--border); }

.btn-small {
  background: var(--bg-input);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  font-size: 11px;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 5px;
  transition: all var(--transition);
}
.btn-small:hover { background: var(--border); color: var(--text-primary); }

/* ─── CHAT AREA ─────────────────────────────────────────────────── */
.chat-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--bg-chat);
  min-width: 0;
  /* Ensure chat-area never collapses when keyboard opens on mobile */
  min-height: 0;
}

/* Chat Header */
.chat-header {
  height: var(--header-height);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 12px;
  flex-shrink: 0;
  z-index: 10;
  box-shadow: var(--shadow-sm);
}

.sidebar-toggle-mobile {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 16px;
  transition: all var(--transition);
}
.sidebar-toggle-mobile:hover { background: var(--bg-input); }

.chat-header-info {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  min-width: 0;
}

.chat-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, #0084ff, #00c6ff);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 16px;
  flex-shrink: 0;
}

.chat-title-block h2 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

.chat-subtitle {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 1px;
}

.chat-header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.device-state-chip {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  border-radius: 20px;
  background: var(--bg-input);
  font-size: 11px;
  font-weight: 600;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  transition: all var(--transition);
}

.device-state-chip.idle     { color: var(--text-muted); }
.device-state-chip.connected { color: var(--secondary); border-color: var(--secondary); }
.device-state-chip.listening { color: #ff6b35; border-color: #ff6b35; background: rgba(255, 107, 53, 0.1); }
.device-state-chip.speaking  { color: #7c4dff; border-color: #7c4dff; background: rgba(124, 77, 255, 0.1); }
.device-state-chip.connecting { color: var(--warning); border-color: var(--warning); }
.device-state-chip.error     { color: var(--danger); border-color: var(--danger); background: rgba(255, 68, 68, 0.1); }

.action-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 15px;
  transition: all var(--transition);
}
.action-btn:hover { background: var(--bg-input); color: var(--primary); }
.action-btn.danger:hover { color: var(--danger); background: rgba(255,68,68,0.1); }

/* Messages Container */
.messages-container {
  flex: 1;
  overflow-y: auto;
  padding: 20px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  scroll-behavior: smooth;
}

.messages-container::-webkit-scrollbar { width: 6px; }
.messages-container::-webkit-scrollbar-track { background: transparent; }
.messages-container::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

/* Message Bubbles */
.message {
  display: flex;
  gap: 8px;
  max-width: 75%;
  animation: messageIn 0.25s ease-out;
}

@keyframes messageIn {
  from { opacity: 0; transform: translateY(8px) scale(0.97); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.message.outgoing {
  align-self: flex-end;
  flex-direction: row-reverse;
}

.message.incoming {
  align-self: flex-start;
}

.message-avatar {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: linear-gradient(135deg, #0084ff, #00c6ff);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 13px;
  flex-shrink: 0;
  align-self: flex-end;
}

.message-content {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.message.outgoing .message-content {
  align-items: flex-end;
}

.message-bubble {
  padding: 10px 14px;
  border-radius: var(--radius-xl);
  font-size: 14px;
  line-height: 1.5;
  word-break: break-word;
  white-space: pre-wrap;
  max-width: 100%;
  position: relative;
}

.message.outgoing .message-bubble {
  background: var(--bubble-out);
  color: var(--bubble-out-text);
  border-bottom-right-radius: 4px;
}

.message.incoming .message-bubble {
  background: var(--bubble-in);
  color: var(--bubble-in-text);
  border-bottom-left-radius: 4px;
}

/* Grouped messages (same sender, close time) */
.message.grouped-top .message-bubble    { border-bottom-right-radius: 4px; }
.message.grouped-middle .message-bubble { border-radius: 4px; }
.message.grouped-bottom .message-bubble { border-top-right-radius: 4px; }

.message.outgoing.grouped-top    .message-bubble { border-bottom-right-radius: 4px; }
.message.outgoing.grouped-middle .message-bubble { border-radius: 4px; border-right: none; }
.message.outgoing.grouped-bottom .message-bubble { border-top-right-radius: var(--radius-xl); }

.message-meta {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  color: var(--text-muted);
  padding: 0 4px;
}

.message.outgoing .message-meta {
  flex-direction: row-reverse;
}

.message-time { font-size: 11px; color: var(--text-muted); }
.message-status { font-size: 11px; color: var(--primary); }

/* System Messages */
.system-message {
  align-self: center;
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bubble-system);
  color: var(--text-secondary);
  font-size: 12px;
  padding: 6px 12px;
  border-radius: 20px;
  max-width: 90%;
  text-align: center;
  margin: 8px 0;
}

.system-message i { color: var(--text-muted); flex-shrink: 0; }

/* Date divider */
.date-divider {
  align-self: center;
  font-size: 11px;
  color: var(--text-muted);
  background: var(--bg-input);
  padding: 4px 12px;
  border-radius: 10px;
  margin: 12px 0 4px;
  border: 1px solid var(--border);
}

/* Special: STT preview (partial speech text) */
.stt-preview {
  align-self: flex-end;
  background: rgba(0, 132, 255, 0.15);
  border: 1px dashed var(--primary);
  color: var(--primary);
  padding: 6px 12px;
  border-radius: var(--radius-lg);
  font-size: 13px;
  font-style: italic;
  max-width: 75%;
  animation: sttPulse 1.5s ease-in-out infinite;
}

@keyframes sttPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

/* Emotion badge */
.emotion-badge {
  align-self: flex-start;
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  color: var(--text-secondary);
  padding: 3px 8px;
  background: var(--bg-input);
  border-radius: 10px;
  border: 1px solid var(--border);
  margin-bottom: 2px;
}

/* Typing Indicator */
.typing-indicator {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  padding: 4px 16px 8px;
  animation: messageIn 0.2s ease-out;
}

.typing-avatar {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: linear-gradient(135deg, #0084ff, #00c6ff);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 13px;
  flex-shrink: 0;
}

.typing-bubble {
  background: var(--bubble-in);
  border-radius: var(--radius-xl);
  border-bottom-left-radius: 4px;
  padding: 10px 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.typing-dots {
  display: flex;
  gap: 4px;
}

.typing-dots span {
  width: 8px;
  height: 8px;
  background: var(--text-muted);
  border-radius: 50%;
  animation: typingBounce 1.4s ease-in-out infinite both;
}

.typing-dots span:nth-child(1) { animation-delay: 0s; }
.typing-dots span:nth-child(2) { animation-delay: 0.2s; }
.typing-dots span:nth-child(3) { animation-delay: 0.4s; }

@keyframes typingBounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.5; }
  30% { transform: translateY(-8px); opacity: 1; }
}

.typing-status {
  font-size: 11px;
  color: var(--text-muted);
  font-style: italic;
}

/* ─── INPUT AREA ────────────────────────────────────────────────── */
.input-area {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 12px 16px;
  flex-shrink: 0;
  box-shadow: 0 -2px 8px rgba(0,0,0,0.05);
}

.input-toolbar {
  display: flex;
  align-items: flex-end;
  gap: 8px;
}

.toolbar-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
  transition: all var(--transition);
}

.mic-btn {
  background: var(--bg-input);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.mic-btn:hover {
  background: rgba(255, 107, 53, 0.1);
  color: #ff6b35;
  border-color: #ff6b35;
}

.mic-btn.active {
  background: #ff6b35;
  color: white;
  border-color: #ff6b35;
  animation: pulse-fast 0.8s ease-in-out infinite;
}

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

.input-wrapper {
  flex: 1;
  background: var(--bg-input);
  border-radius: 20px;
  border: 1px solid var(--border);
  padding: 0 4px;
  transition: all var(--transition);
}

.input-wrapper:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(0,132,255,0.15);
}

#messageInput {
  width: 100%;
  background: none;
  border: none;
  outline: none;
  padding: 10px 12px;
  font-size: 14px;
  font-family: inherit;
  color: var(--text-primary);
  resize: none;
  max-height: 120px;
  line-height: 1.5;
  display: block;
}

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

.send-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--primary);
  color: white;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
  transition: all var(--transition);
  box-shadow: var(--shadow-sm);
}

.send-btn:hover { background: var(--primary-dark); transform: scale(1.05); }
.send-btn:active { transform: scale(0.95); }
.send-btn:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }

.input-status-bar {
  display: flex;
  justify-content: space-between;
  padding: 4px 4px 0;
  font-size: 11px;
  color: var(--text-muted);
}

/* ─── DEBUG PANEL ───────────────────────────────────────────────── */
.debug-panel {
  position: absolute;
  top: var(--header-height);
  left: var(--sidebar-width);
  right: 0;
  bottom: 0;
  background: #0d1117;
  z-index: 50;
  display: flex;
  flex-direction: column;
}

.debug-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: #161b22;
  border-bottom: 1px solid #30363d;
}

.debug-header h3 {
  font-size: 13px;
  font-weight: 600;
  color: #58a6ff;
  display: flex;
  align-items: center;
  gap: 8px;
}

.debug-actions { display: flex; gap: 8px; }

.debug-log {
  flex: 1;
  overflow-y: auto;
  padding: 12px 16px;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 12px;
  line-height: 1.7;
}

.debug-log::-webkit-scrollbar { width: 5px; }
.debug-log::-webkit-scrollbar-thumb { background: #30363d; border-radius: 2px; }

.log-entry {
  display: flex;
  gap: 8px;
  padding: 2px 0;
  border-bottom: 1px solid rgba(255,255,255,0.03);
}

.log-time { color: #6e7681; flex-shrink: 0; }
.log-tag  { flex-shrink: 0; font-weight: 700; min-width: 80px; }
.log-msg  { color: #c9d1d9; word-break: break-all; }

.log-tag.BOOT   { color: #7c3aed; }
.log-tag.AUTH   { color: #0ea5e9; }
.log-tag.WS     { color: #22c55e; }
.log-tag.CHAT   { color: #f59e0b; }
.log-tag.PROTO  { color: #ec4899; }
.log-tag.AUDIO  { color: #14b8a6; }
.log-tag.ERROR  { color: #ef4444; }
.log-tag.WARN   { color: #f97316; }
.log-tag.INFO   { color: #6b7280; }
.log-tag.STATE  { color: #a78bfa; }
.log-tag.MCP    { color: #84cc16; }

/* ─── INFO PANEL ────────────────────────────────────────────────── */
.info-panel {
  position: absolute;
  top: var(--header-height);
  left: var(--sidebar-width);
  right: 0;
  bottom: 0;
  background: var(--bg-secondary);
  z-index: 50;
  overflow-y: auto;
}

.info-content {
  padding: 24px;
  max-width: 600px;
}

.info-content h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.info-content h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  margin: 20px 0 10px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.info-content p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.protocol-table {
  background: var(--bg-input);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border);
}

.proto-row {
  display: flex;
  align-items: center;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  gap: 12px;
}

.proto-row:last-child { border-bottom: none; }

.proto-row span {
  font-size: 12px;
  color: var(--text-secondary);
  min-width: 120px;
}

.proto-row code {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 12px;
  color: var(--primary);
  background: var(--primary-light);
  padding: 2px 6px;
  border-radius: 4px;
}

.flow-list {
  padding-left: 18px;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 2;
}

.flow-list code {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 12px;
  color: var(--primary);
  background: var(--primary-light);
  padding: 1px 5px;
  border-radius: 3px;
}

.identity-display {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 12px;
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ─── LOADING OVERLAY ───────────────────────────────────────────── */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity var(--transition);
}

.loading-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.loading-card {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: 32px 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  box-shadow: var(--shadow-lg);
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-text {
  font-size: 14px;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ─── PAIRING / ACTIVATION OVERLAY ─────────────────────────────── */
.pairing-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.65);
  backdrop-filter: blur(4px);
  z-index: 9500;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.pairing-card {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  max-width: 420px;
  width: 100%;
  box-shadow: var(--shadow-lg);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.pairing-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.pairing-header i {
  font-size: 28px;
  color: var(--primary);
}

.pairing-header h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
}

.pairing-message {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}

.pairing-message a {
  color: var(--primary);
  font-weight: 600;
}

.pairing-code {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 48px;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--primary);
  background: var(--primary-light);
  border: 2px solid var(--primary);
  border-radius: var(--radius-md);
  padding: 16px 24px;
  user-select: all;
}

.pairing-copy-btn {
  width: 100%;
}

.pairing-status-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-secondary);
}

.pairing-status-row i {
  color: var(--primary);
}

.pairing-cancel-btn {
  width: 100%;
  margin-top: 4px;
}

.pairing-status-display {
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  background: var(--bg-input);
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

.pairing-status-display.paired {
  color: var(--secondary);
  border-color: var(--secondary);
  background: rgba(0, 200, 81, 0.08);
}

.pairing-status-display.unpaired {
  color: var(--warning);
  border-color: var(--warning);
  background: rgba(255, 187, 51, 0.08);
}

.btn-block {
  width: 100%;
}

/* ─── TOAST NOTIFICATIONS ───────────────────────────────────────── */
.toast-container {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 9000;
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-width: 360px;
  pointer-events: none;
}

.toast {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  box-shadow: var(--shadow-md);
  font-size: 13px;
  color: var(--text-primary);
  display: flex;
  align-items: flex-start;
  gap: 10px;
  pointer-events: auto;
  animation: toastIn 0.3s ease-out;
  transition: opacity var(--transition), transform var(--transition);
}

.toast.toast-success { border-left-color: var(--secondary); }
.toast.toast-error   { border-left-color: var(--danger); }
.toast.toast-warning { border-left-color: var(--warning); }

.toast.hiding {
  opacity: 0;
  transform: translateX(100%);
}

@keyframes toastIn {
  from { opacity: 0; transform: translateX(80px); }
  to   { opacity: 1; transform: translateX(0); }
}

.toast-icon { font-size: 15px; flex-shrink: 0; margin-top: 1px; }
.toast-success .toast-icon { color: var(--secondary); }
.toast-error .toast-icon   { color: var(--danger); }
.toast-warning .toast-icon { color: var(--warning); }
.toast-info .toast-icon    { color: var(--primary); }

.toast-body { flex: 1; line-height: 1.4; }
.toast-title { font-weight: 600; margin-bottom: 2px; }
.toast-desc  { font-size: 12px; color: var(--text-secondary); }

/* ─── RESPONSIVE (Mobile & Tablet) ─────────────────────────────── */

/* ── Tablet (≤ 900px) ────────────────────────────────────────── */
@media (max-width: 900px) {
  :root {
    --sidebar-width: 280px;
  }
}

/* ── Mobile (≤ 768px) ────────────────────────────────────────── */
@media (max-width: 768px) {
  /* ── Sidebar: hidden by default, slides in on mobile ───────── */
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    /* Full height including safe-area for notch devices */
    height: 100%;
    height: 100dvh;
    transform: translateX(-100%);
    z-index: 300;
    box-shadow: var(--shadow-lg);
    /* Respect iOS safe area on left side */
    padding-left: env(safe-area-inset-left, 0px);
  }

  .sidebar.mobile-open {
    transform: translateX(0);
  }

  /* Sidebar backdrop overlay */
  .sidebar.mobile-open::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: -1;
    pointer-events: none;
  }

  .sidebar-toggle-mobile {
    display: flex;
  }

  /* ── Debug / Info panels: full width on mobile ─────────────── */
  .debug-panel,
  .info-panel {
    left: 0;
  }

  /* ── Chat area: full width, flex column with sticky input ──── */
  .chat-area {
    /* Use min-height: 0 so flex children can shrink below their content */
    min-height: 0;
    /* Critical: use dvh so the layout adjusts when the keyboard appears */
    height: 100dvh;
    display: flex;
    flex-direction: column;
  }

  /* ── Messages: scrollable, fills all available space ─────── */
  .messages-container {
    flex: 1 1 auto;
    min-height: 0;           /* Allow shrinking when keyboard opens */
    overflow-y: auto;
    padding: 12px 10px;
    /* Add bottom padding so last message isn't hidden behind the input */
    padding-bottom: 8px;
    -webkit-overflow-scrolling: touch;  /* Smooth iOS momentum scrolling */
    overscroll-behavior-y: contain;
  }

  /* ── Input area: sticky at the very bottom ──────────────── */
  .input-area {
    flex: 0 0 auto;          /* Don't grow or shrink */
    padding: 8px 10px;
    /* Respect iOS home-indicator safe area */
    padding-bottom: calc(8px + env(safe-area-inset-bottom, 0px));
    /* Keep visible even when keyboard is partially open */
    position: sticky;
    bottom: 0;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    box-shadow: 0 -2px 8px rgba(0,0,0,0.06);
    z-index: 20;
  }

  /* ── Chat header ─────────────────────────────────────────── */
  .chat-header {
    flex: 0 0 auto;
    padding: 0 12px;
    /* Respect iOS notch safe area */
    padding-top: env(safe-area-inset-top, 0px);
    height: calc(var(--header-height) + env(safe-area-inset-top, 0px));
  }

  /* ── Messages ────────────────────────────────────────────── */
  .message { max-width: 90%; }

  /* ── Typing indicator: don't overflow ───────────────────── */
  .typing-indicator {
    padding: 4px 10px 6px;
    flex-shrink: 0;
  }

  /* ── Device state chip: hide label text on small screens ─── */
  .device-state-chip {
    padding: 4px 8px;
    font-size: 10px;
  }

  /* ── Action buttons: slightly smaller ───────────────────── */
  .action-btn {
    width: 32px;
    height: 32px;
    font-size: 14px;
  }

  /* ── Input toolbar: ensure buttons don't overflow ─────── */
  .input-toolbar {
    gap: 6px;
  }

  .toolbar-btn {
    width: 38px;
    height: 38px;
    flex-shrink: 0;
  }

  .send-btn {
    width: 38px;
    height: 38px;
    flex-shrink: 0;
  }

  /* ── Status bar: smaller text ─────────────────────────── */
  .input-status-bar {
    font-size: 10px;
  }

  /* ── Toast: respect safe area ──────────────────────────── */
  .toast-container {
    top: calc(16px + env(safe-area-inset-top, 0px));
    right: calc(16px + env(safe-area-inset-right, 0px));
    max-width: calc(100vw - 32px - env(safe-area-inset-left, 0px) - env(safe-area-inset-right, 0px));
  }

  /* ── Chat header actions: compress on small viewports ─── */
  .chat-header-actions {
    gap: 4px;
  }
}

/* ── Very small phones (≤ 375px) ─────────────────────────────── */
@media (max-width: 375px) {
  .chat-header {
    padding: 0 8px;
  }

  .device-state-chip {
    display: none;   /* Hide on very small screens to save space */
  }

  .chat-title-block h2 {
    font-size: 14px;
  }

  .chat-subtitle {
    font-size: 11px;
  }
}

/* ── Landscape phone ─────────────────────────────────────────── */
@media (max-height: 500px) and (max-width: 900px) {
  /* In landscape on phones the viewport is very short.
     Reduce header height so more chat is visible. */
  :root {
    --header-height: 44px;
  }

  .chat-header {
    height: var(--header-height);
  }

  .messages-container {
    padding: 6px 10px;
  }

  .input-area {
    padding: 6px 10px;
    padding-bottom: calc(6px + env(safe-area-inset-bottom, 0px));
  }
}

/* ─── Scrollbar styles ──────────────────────────────────────────── */
.sidebar::-webkit-scrollbar,
.conversation-list::-webkit-scrollbar,
.settings-body::-webkit-scrollbar,
.info-panel::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-thumb,
.conversation-list::-webkit-scrollbar-thumb,
.settings-body::-webkit-scrollbar-thumb,
.info-panel::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 2px;
}

/* ─── Streaming cursor blink ────────────────────────────────────── */
.cursor-blink {
  display: inline-block;
  animation: cursorBlink 0.8s step-end infinite;
  opacity: 1;
  color: var(--primary);
  font-weight: 300;
  margin-left: 1px;
}

@keyframes cursorBlink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}

/* ─── Utility ───────────────────────────────────────────────────── */
.hidden  { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }

/* Shimmer animation for loading states */
.shimmer {
  background: linear-gradient(90deg,
    var(--bg-input) 25%,
    var(--border) 50%,
    var(--bg-input) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}