/* =========================================================================
   Echo Voice Assistant — Web UI Styles
   ========================================================================= */

:root {
  --bg: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #f1f3f5;
  --surface: #ffffff;
  --border: #e5e7eb;
  --border-light: #f0f0f0;
  --text: #111827;
  --text-secondary: #6b7280;
  --text-muted: #9ca3af;
  --primary: #111827;
  --primary-fg: #ffffff;
  --accent: #10b981;
  --accent-hover: #059669;
  --danger: #ef4444;
  --danger-bg: #fef2f2;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,.12);
  --radius: 12px;
  --radius-lg: 16px;
  --transition: .2s ease;
  --sidebar-width: 272px;
  --header-height: 56px;
}

.dark {
  --bg: #0f0f0f;
  --bg-secondary: #1a1a1a;
  --bg-tertiary: #252525;
  --surface: #1a1a1a;
  --border: #2a2a2a;
  --border-light: #222;
  --text: #f0f0f0;
  --text-secondary: #999;
  --text-muted: #666;
  --primary: #e5e5e5;
  --primary-fg: #111;
  --accent: #10b981;
  --accent-hover: #34d399;
  --danger: #f87171;
  --danger-bg: #2a1515;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.2);
  --shadow-md: 0 4px 12px rgba(0,0,0,.3);
  --shadow-lg: 0 8px 24px rgba(0,0,0,.4);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  height: 100vh;
  overflow: hidden;
}

/* ---- Layout ---- */
#app {
  display: flex;
  height: 100vh;
}

.hidden { display: none !important; }

/* ---- Sidebar ---- */
.sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  transition: margin-left var(--transition), opacity var(--transition);
  z-index: 20;
}

.sidebar.collapsed {
  margin-left: calc(-1 * var(--sidebar-width));
  opacity: 0;
  pointer-events: none;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 15px;
  color: var(--accent);
}

.new-chat-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 12px;
  padding: 10px 16px;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  background: transparent;
  color: var(--text);
  font-size: 13px;
  cursor: pointer;
  transition: all var(--transition);
}
.new-chat-btn:hover {
  background: var(--bg-tertiary);
  border-color: var(--accent);
  color: var(--accent);
}

.history-list {
  flex: 1;
  overflow-y: auto;
  padding: 4px 8px;
}
.history-list::-webkit-scrollbar { width: 4px; }
.history-list::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

.history-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 8px;
  cursor: pointer;
  transition: background var(--transition);
  margin-bottom: 2px;
}
.history-item:hover { background: var(--bg-tertiary); }
.history-item.active { background: var(--primary); color: var(--primary-fg); }

.history-item .title {
  flex: 1;
  font-size: 13px;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.history-item .time {
  font-size: 11px;
  opacity: .5;
  white-space: nowrap;
}
.history-item .delete-btn {
  opacity: 0;
  background: none;
  border: none;
  color: inherit;
  cursor: pointer;
  padding: 2px;
  transition: opacity var(--transition);
}
.history-item:hover .delete-btn { opacity: .6; }
.history-item .delete-btn:hover { opacity: 1; }

.sidebar-footer {
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
}
.status-dot.online { background: var(--accent); }
.status-dot.offline { background: var(--danger); }

.status-text { color: var(--text-secondary); }

.empty-state {
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
  padding: 32px 16px;
}

/* ---- Main ---- */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

/* ---- Header ---- */
.header {
  height: var(--header-height);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 12px;
  background: var(--surface);
  flex-shrink: 0;
}

.header-center { flex: 1; min-width: 0; }
.header-center h1 { font-size: 15px; font-weight: 600; }
.header-subtitle { font-size: 12px; color: var(--text-secondary); }

.header-right { display: flex; align-items: center; gap: 4px; }

.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
}
.icon-btn:hover { background: var(--bg-tertiary); color: var(--text); }

.badge {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: transparent;
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
}
.badge:hover { border-color: var(--text-secondary); }
.badge.active { border-color: var(--accent); color: var(--accent); }
.badge.recording {
  border-color: var(--danger);
  color: var(--danger);
  background: var(--danger-bg);
  animation: pulse-badge 1.5s ease infinite;
}

@keyframes pulse-badge {
  0%, 100% { opacity: 1; }
  50% { opacity: .7; }
}

/* ---- Chat Area ---- */
.chat-area {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
}
.chat-area::-webkit-scrollbar { width: 6px; }
.chat-area::-webkit-scrollbar-thumb { background: var(--border); border-radius: 6px; }

.welcome {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  text-align: center;
  gap: 12px;
  padding: 32px;
}
.welcome-icon {
  width: 72px;
  height: 72px;
  border-radius: 20px;
  background: linear-gradient(135deg, var(--accent), #06b6d4);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  margin-bottom: 8px;
}
.welcome h2 { font-size: 22px; font-weight: 700; }
.welcome p { font-size: 14px; color: var(--text-secondary); max-width: 320px; line-height: 1.6; }

.messages {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

/* ---- Message Bubbles ---- */
.message {
  display: flex;
  gap: 10px;
  padding: 8px 0;
  animation: msg-in .25s ease;
}
@keyframes msg-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.message.user { flex-direction: row-reverse; }

.avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 14px;
}
.message.user .avatar { background: var(--primary); color: var(--primary-fg); }
.message.assistant .avatar { background: var(--bg-tertiary); color: var(--text-secondary); }

.bubble {
  max-width: 75%;
  padding: 10px 16px;
  border-radius: 18px;
  font-size: 14px;
  line-height: 1.6;
  position: relative;
}
.message.user .bubble {
  background: var(--primary);
  color: var(--primary-fg);
  border-bottom-right-radius: 4px;
}
.message.assistant .bubble {
  background: var(--bg-tertiary);
  color: var(--text);
  border-bottom-left-radius: 4px;
}

.bubble .speak-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  opacity: 0;
  transition: opacity var(--transition);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-secondary);
}
.message.assistant .bubble .speak-btn { left: -36px; }
.bubble:hover .speak-btn { opacity: 1; }

/* Typing indicator */
.typing-indicator {
  display: flex;
  gap: 5px;
  padding: 4px 0;
}
.typing-indicator span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
  animation: typing-bounce 1.4s ease-in-out infinite;
}
.typing-indicator span:nth-child(2) { animation-delay: .2s; }
.typing-indicator span:nth-child(3) { animation-delay: .4s; }
@keyframes typing-bounce {
  0%, 60%, 100% { transform: translateY(0); }
  30% { transform: translateY(-6px); }
}

/* Streaming cursor */
.streaming-cursor {
  display: inline-block;
  width: 2px;
  height: 16px;
  background: var(--text-secondary);
  vertical-align: text-bottom;
  animation: blink .8s ease infinite;
  margin-left: 2px;
}
@keyframes blink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

/* Action card */
.action-card {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  margin-top: 8px;
  border-radius: 10px;
  background: var(--accent);
  color: white;
  font-size: 12px;
  font-weight: 500;
}
.action-card svg { flex-shrink: 0; }

/* ---- Input Area ---- */
.input-area {
  border-top: 1px solid var(--border);
  padding: 12px 16px;
  background: var(--surface);
}

.chat-form {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  align-items: flex-end;
  gap: 10px;
}

.mic-btn {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all var(--transition);
}
.mic-btn:hover { border-color: var(--text-secondary); color: var(--text); }
.mic-btn.recording {
  background: var(--danger);
  border-color: var(--danger);
  color: white;
  animation: pulse-mic 1.5s ease infinite;
}
@keyframes pulse-mic {
  0%, 100% { box-shadow: 0 0 0 0 rgba(239,68,68,.4); }
  50% { box-shadow: 0 0 0 10px rgba(239,68,68,0); }
}

.input-wrapper {
  flex: 1;
  position: relative;
}

#message-input {
  width: 100%;
  padding: 10px 16px;
  border: 1px solid var(--border);
  border-radius: 22px;
  background: var(--bg-secondary);
  color: var(--text);
  font-size: 14px;
  font-family: inherit;
  resize: none;
  outline: none;
  line-height: 1.5;
  max-height: 160px;
  transition: border-color var(--transition);
}
#message-input:focus { border-color: var(--accent); }
#message-input::placeholder { color: var(--text-muted); }

.send-btn {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: none;
  background: var(--primary);
  color: var(--primary-fg);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all var(--transition);
  opacity: .4;
}
.send-btn:not(:disabled) { opacity: 1; }
.send-btn:not(:disabled):hover { transform: scale(1.05); }

.recording-indicator {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin-top: 6px;
  font-size: 12px;
  color: var(--danger);
}
.rec-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--danger);
  animation: blink 1s ease infinite;
}

/* ---- Settings Panel ---- */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.4);
  z-index: 40;
  backdrop-filter: blur(2px);
}

.settings-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: 360px;
  max-width: 90vw;
  height: 100vh;
  background: var(--surface);
  border-left: 1px solid var(--border);
  z-index: 50;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
}

.settings-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}
.settings-header h2 { font-size: 16px; font-weight: 600; }

.settings-body {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
}

.setting-group h3 {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 0;
  cursor: pointer;
}

.setting-label { font-size: 14px; font-weight: 500; display: block; }
.setting-desc { font-size: 12px; color: var(--text-muted); display: block; margin-top: 2px; }

.setting-row input[type="checkbox"] {
  width: 40px;
  height: 22px;
  accent-color: var(--accent);
  cursor: pointer;
}

.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 16px 0;
}

.about-text {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    z-index: 30;
    box-shadow: var(--shadow-lg);
  }
  .sidebar.collapsed {
    margin-left: 0;
    transform: translateX(-100%);
  }
  .bubble { max-width: 85%; }
  .badge span { display: none; }
  .settings-panel { width: 100%; }
}

/* ---- Theme toggle (top-right of settings) ---- */
.theme-toggle {
  margin-top: auto;
  padding-top: 16px;
}