/* ============================================================
   AI Platform — Warm Gallery × Deep Observatory
   Apple-inspired minimalism, dual independent themes, glassmorphism
   ============================================================ */

/* ==================== Design Tokens ==================== */
:root {
  /* Dark Theme (Default) — Deep Observatory */
  --bg-primary: #09090F;
  --bg-secondary: #111118;
  --bg-tertiary: #1A1A26;
  --bg-input: #16161F;
  --border: rgba(255, 255, 255, 0.06);
  --border-strong: rgba(255, 255, 255, 0.10);
  --text-primary: #E8E6F0;
  --text-secondary: #8E8C9A;
  --text-muted: #5C5A6A;
  --accent: #B4A6E0;
  --accent-hover: #C9BEF0;
  --accent-glow: rgba(180, 166, 224, 0.12);
  --accent-text: #0D0D1A;
  --danger: #F87171;
  --warning: #FBBF24;
  --info: #60A5FA;
  --success: #4ADE80;

  /* Glass */
  --glass-bg: rgba(255, 255, 255, 0.03);
  --glass-blur: 24px;
  --glass-border: rgba(255, 255, 255, 0.06);

  /* Shadows */
  --shadow-sm: 0 1px 4px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 24px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.6);

  /* User bubble */
  --user-bubble-gradient: linear-gradient(135deg, #9B8EC4 0%, #B4A6E0 50%, #C9BEF0 100%);
  --user-bubble-shadow: 0 4px 20px rgba(180, 166, 224, 0.2);
  --user-bubble-text: #0D0D1A;

  /* AI bubble */
  --ai-bubble-bg: var(--bg-secondary);
  --ai-bubble-border: var(--border-strong);

  /* Avatars */
  --ai-avatar-gradient: linear-gradient(135deg, #B4A6E0, #7C6EAC);
  --user-avatar-gradient: linear-gradient(135deg, #9B8EC4, #C9BEF0);

  /* Typography */
  --font-display: 'Fraunces', Georgia, 'Times New Roman', serif;
  --font-body: 'Instrument Sans', 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Cascadia Code', 'Fira Code', Consolas, monospace;

  /* Spacing scale */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;

  /* Radius scale */
  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 28px;
  --radius-xl: 32px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-theme: 0.5s ease;
}

/* ==================== Light Theme — Warm Gallery ==================== */
[data-theme="light"] {
  --bg-primary: #FAF8F5;
  --bg-secondary: #F3EFE9;
  --bg-tertiary: #EBE5DB;
  --bg-input: #F5F2ED;
  --border: rgba(0, 0, 0, 0.06);
  --border-strong: rgba(0, 0, 0, 0.10);
  --text-primary: #1E1B18;
  --text-secondary: #78716C;
  --text-muted: #A8A29E;
  --accent: #C2674A;
  --accent-hover: #D4785A;
  --accent-glow: rgba(194, 103, 74, 0.1);
  --accent-text: #FFFFFF;
  --danger: #DC2626;
  --warning: #D97706;
  --info: #3B82F6;
  --success: #22C55E;

  /* Glass */
  --glass-bg: rgba(255, 255, 255, 0.55);
  --glass-blur: 20px;
  --glass-border: rgba(0, 0, 0, 0.06);

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.08);

  /* User bubble */
  --user-bubble-gradient: linear-gradient(135deg, #C2674A 0%, #D4785A 50%, #E89070 100%);
  --user-bubble-shadow: 0 4px 20px rgba(194, 103, 74, 0.2);
  --user-bubble-text: #FFFFFF;

  /* AI bubble */
  --ai-bubble-bg: #FFFFFF;
  --ai-bubble-border: rgba(0, 0, 0, 0.08);

  /* Avatars */
  --ai-avatar-gradient: linear-gradient(135deg, #C2674A, #A0523D);
  --user-avatar-gradient: linear-gradient(135deg, #C2674A, #E89070);
}

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

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  height: 100vh;
  overflow: hidden;
  display: flex;
  transition: background var(--transition-theme), color var(--transition-theme);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ==================== Noise Texture Overlay ==================== */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.4'/%3E%3C/svg%3E");
}

/* ==================== Sidebar ==================== */
.sidebar {
  width: 280px;
  min-width: 280px;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-right: 0.5px solid var(--glass-border);
  display: flex;
  flex-direction: column;
  transition: width 0.3s ease, min-width 0.3s ease, background var(--transition-theme);
  z-index: 100;
  overflow: hidden;
}
.sidebar.collapsed { width: 0; min-width: 0; border-right: none; }

.sidebar-header {
  padding: 20px 16px;
  border-bottom: 0.5px solid var(--border);
  display: flex; align-items: center; gap: 12px;
}
.sidebar-header .logo {
  width: 36px; height: 36px; border-radius: var(--radius-sm);
  background: var(--accent);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; font-weight: 700; color: var(--accent-text);
  font-family: var(--font-display);
  letter-spacing: -0.5px;
  flex-shrink: 0;
}
.sidebar-header h2 {
  font-size: 16px; font-weight: 500;
  font-family: var(--font-display);
  color: var(--text-primary);
  letter-spacing: -0.3px;
}
.sidebar-collapse-btn {
  margin-left: auto; background: none; border: none;
  color: var(--text-secondary); cursor: pointer;
  font-size: 14px; padding: 6px 10px; border-radius: 8px;
  transition: all var(--transition-fast);
  font-family: var(--font-body);
}
.sidebar-collapse-btn:hover { background: var(--bg-tertiary); color: var(--text-primary); }
.sidebar.collapsed .sidebar-collapse-btn { transform: rotate(180deg); }

/* New Chat Button */
.new-chat-btn {
  margin: 16px;
  padding: 12px 20px;
  background: var(--accent);
  color: var(--accent-text);
  border: none;
  border-radius: var(--radius-md);
  font-size: 14px; font-weight: 600;
  font-family: var(--font-body);
  cursor: pointer;
  display: flex; align-items: center; gap: 8px;
  transition: all var(--transition-smooth);
  letter-spacing: -0.2px;
}
.new-chat-btn:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 8px 24px var(--accent-glow);
}

/* Sidebar Sections */
.sidebar-section {
  padding: 8px 16px;
  font-size: 10px; font-weight: 600;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 1px;
  font-family: var(--font-body);
}

/* Tool Buttons */
.tool-btn {
  display: flex; align-items: center; gap: 10px;
  width: calc(100% - 24px); margin: 2px 12px;
  padding: 10px 14px;
  background: transparent; color: var(--text-secondary);
  border: none; border-radius: var(--radius-sm);
  font-size: 13px; cursor: pointer;
  font-family: var(--font-body);
  transition: all var(--transition-fast);
}
.tool-btn:hover { background: var(--bg-tertiary); color: var(--text-primary); }
.tool-btn.active { background: var(--accent-glow); color: var(--accent); font-weight: 500; }

/* Model Select (sidebar) */
.model-select {
  margin: 0 12px;
  width: calc(100% - 24px);
  padding: 8px 12px;
  background: var(--bg-input);
  color: var(--text-primary);
  border: 0.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-family: var(--font-body);
  cursor: pointer;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.model-select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

/* Conversation List */
.conversation-list {
  flex: 1; overflow-y: auto;
  padding: 0 8px; margin-bottom: 8px;
  min-height: 0;
}
.conv-item {
  padding: 10px 14px; margin: 2px 0;
  border-radius: var(--radius-sm); cursor: pointer;
  transition: all var(--transition-fast);
  display: flex; align-items: center; gap: 8px;
  font-size: 13px; color: var(--text-secondary);
  white-space: nowrap; overflow: hidden;
  font-family: var(--font-body);
}
.conv-item:hover { background: var(--bg-tertiary); color: var(--text-primary); }
.conv-item.active { background: var(--accent-glow); color: var(--accent); font-weight: 500; }
.conv-item .conv-title {
  flex: 1; overflow: hidden; text-overflow: ellipsis;
}
.conv-item .conv-time {
  font-size: 10px; color: var(--text-muted); flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}
.conv-item .conv-del {
  opacity: 0; background: none; border: none;
  color: var(--danger); cursor: pointer;
  font-size: 12px; padding: 2px 6px; border-radius: 6px;
  transition: opacity 0.2s;
}
.conv-item:hover .conv-del { opacity: 0.7; }
.conv-item .conv-del:hover { opacity: 1; background: var(--bg-tertiary); }

/* Sidebar Spacer + Settings Button */
.sidebar-spacer { flex: 1; }
.settings-btn {
  display: flex; align-items: center; gap: 8px;
  margin: 0 12px 12px; padding: 10px 14px;
  border-radius: var(--radius-sm); border: 0.5px solid var(--border);
  background: var(--glass-bg); color: var(--text-secondary);
  font-size: 13px; cursor: pointer; transition: all var(--transition-fast);
  font-family: var(--font-body);
}
.settings-btn:hover { background: var(--bg-tertiary); color: var(--text-primary); border-color: var(--accent); }

/* Sidebar Footer */
.sidebar-footer {
  margin-top: auto; padding: 12px 16px;
  border-top: 0.5px solid var(--border);
}

/* ==================== Main Content ==================== */
.main {
  flex: 1; display: flex; flex-direction: column;
  min-width: 0; position: relative;
  transition: margin-left 0.3s ease;
  background: var(--bg-primary);
}

/* Topbar */
.topbar {
  padding: 10px 20px;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-bottom: 0.5px solid var(--glass-border);
  display: flex; align-items: center; gap: 12px;
  min-height: 52px;
}
.topbar .topbar-title {
  font-weight: 500;
  font-size: 14px;
  color: var(--accent);
  font-family: var(--font-display);
  letter-spacing: -0.2px;
}
.topbar button {
  background: none; border: none; color: var(--text-secondary);
  cursor: pointer; padding: 6px 10px; border-radius: 8px;
  font-size: 18px; transition: all var(--transition-fast);
  font-family: var(--font-body);
  display: flex; align-items: center; justify-content: center;
}
.topbar button:hover { background: var(--bg-tertiary); color: var(--text-primary); }

/* Theme Toggle */
.theme-toggle {
  margin-left: auto;
  width: 36px; height: 36px;
  border-radius: 50% !important;
  padding: 6px !important;
  position: relative;
}
.theme-toggle svg {
  width: 18px; height: 18px;
  stroke: var(--text-secondary);
  fill: none;
  stroke-width: 1.5;
  transition: all var(--transition-smooth);
}
.theme-toggle:hover svg { stroke: var(--accent); }
/* Show/hide based on theme */
[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: block; }

/* ==================== Chat Area ==================== */
.chat-container {
  flex: 1; overflow-y: auto;
  padding: 24px 20px;
  display: flex; flex-direction: column; gap: 20px;
  align-items: flex-start;
  scroll-behavior: smooth;
}

/* Welcome Screen */
.welcome {
  text-align: center; margin: auto;
  animation: fadeUp 0.6s ease;
}
.welcome h1 {
  font-size: 32px; font-weight: 500;
  font-family: var(--font-display);
  color: var(--text-primary);
  margin-bottom: 12px;
  letter-spacing: -0.5px;
}
.welcome p {
  color: var(--text-secondary);
  font-size: 14px;
  max-width: 420px;
  line-height: 1.6;
  font-family: var(--font-body);
}
.welcome .quick-actions {
  display: flex; gap: 8px; justify-content: center;
  margin-top: 24px; flex-wrap: wrap;
}
.quick-action {
  padding: 10px 18px;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 0.5px solid var(--glass-border);
  border-radius: var(--radius-full);
  font-size: 13px; color: var(--text-secondary);
  cursor: pointer; transition: all var(--transition-smooth);
  font-family: var(--font-body);
}
.quick-action:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px var(--accent-glow);
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ==================== Messages ==================== */
.message {
  display: flex; gap: 12px;
  max-width: 780px; width: fit-content;
  align-items: flex-start;
  animation: msgIn 0.4s cubic-bezier(0.21, 1.02, 0.53, 1) both;
  transition: transform 0.2s ease;
}
.message:hover {
  transform: translateY(-2px);
}

@keyframes msgIn {
  from {
    opacity: 0;
    transform: translateY(16px) scale(0.97);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.message.ai { align-self: flex-start; }
.message.user { align-self: flex-end; flex-direction: row-reverse; }

/* Avatars */
.avatar {
  width: 36px; height: 36px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; flex-shrink: 0; font-weight: 600;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  transition: transform 0.2s ease;
  font-family: var(--font-body);
  color: #fff;
}
.message:hover .avatar { transform: scale(1.08); }
.message.ai .avatar { background: var(--ai-avatar-gradient); }
.message.user .avatar { background: var(--user-avatar-gradient); }

/* Bubbles */
.bubble {
  padding: 12px 18px;
  border-radius: var(--radius-md);
  line-height: 1.55;
  font-size: 14px;
  white-space: pre-wrap; word-break: break-word;
  position: relative; min-width: 48px;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
  font-family: var(--font-body);
  text-box-trim: both;
  text-box-edge: cap alphabetic;
  margin-block: -0.2em;
}

/* AI bubble */
.message.ai .bubble {
  background: var(--ai-bubble-bg);
  border: 0.5px solid var(--ai-bubble-border);
  box-shadow: var(--shadow-sm);
}

/* User bubble */
.message.user .bubble {
  background: var(--user-bubble-gradient);
  color: var(--user-bubble-text);
  border: none;
  box-shadow: var(--user-bubble-shadow);
}

.bubble:hover {
  box-shadow: var(--shadow-md);
}

/* Bubble Media (images, audio) */
.bubble img {
  max-width: 100%;
  border-radius: var(--radius-sm);
  margin: 8px 0;
  cursor: pointer;
  transition: transform 0.2s ease;
}
.bubble img:hover { transform: scale(1.02); }
.bubble audio {
  margin: 8px 0; width: 100%; max-width: 400px;
}
.bubble .bubble-media-wrap {
  margin: 8px 0;
}
.bubble .bubble-media-wrap img {
  max-width: 100%;
  display: block;
  cursor: pointer;
}
.bubble .bubble-media-wrap audio {
  width: 100%;
  max-width: 400px;
  display: block;
}

/* Tool badge */
.bubble .tool-badge {
  display: inline-block;
  background: var(--accent-glow);
  color: var(--accent);
  font-size: 11px; padding: 3px 10px; border-radius: var(--radius-full);
  margin-bottom: 6px; font-weight: 600;
  font-family: var(--font-body);
}

/* Bubble action buttons */
.bubble .actions {
  display: flex; gap: 6px; margin-top: 10px;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.2s, transform 0.2s;
}
.bubble:hover .actions {
  opacity: 1;
  transform: translateY(0);
}
.actions button {
  background: var(--bg-input); border: 0.5px solid var(--border);
  color: var(--text-secondary); padding: 5px 12px;
  border-radius: 8px; font-size: 12px; cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-body);
}
.actions button:hover { background: var(--bg-tertiary); color: var(--text-primary); }

/* Action buttons in user bubble */
.message.user .actions button {
  background: rgba(255, 255, 255, 0.15);
  border: 0.5px solid rgba(255, 255, 255, 0.2);
  color: rgba(255, 255, 255, 0.9);
}
.message.user .actions button:hover {
  background: rgba(255, 255, 255, 0.25);
  color: #fff;
}

/* Think highlight block */
.think-highlight {
  background: var(--accent-glow);
  border-left: 3px solid var(--accent);
  padding: 10px 14px;
  margin: 8px 0;
  border-radius: 0 8px 8px 0;
  font-size: 13px;
  color: var(--text-secondary);
}

/* Streaming Cursor */
.streaming-cursor::after {
  content: '|'; animation: blink 1s infinite;
  color: var(--accent); font-weight: 400;
}
@keyframes blink { 0%, 50% { opacity: 1; } 51%, 100% { opacity: 0; } }

/* ==================== Input Area ==================== */
.input-area {
  padding: 16px 20px 20px;
  background: transparent;
}
.input-wrapper {
  max-width: 780px; margin: 0 auto;
  display: flex; gap: 10px; align-items: flex-end;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 0.5px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 8px 8px 8px 18px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.input-wrapper:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-glow);
}

.input-wrapper textarea {
  flex: 1; background: none; border: none;
  color: var(--text-primary); font-size: 14px;
  font-family: var(--font-body);
  resize: none; outline: none;
  min-height: 24px; max-height: 150px;
  line-height: 1.5;
  transition: height 0.15s ease;
  align-self: center;
}
.input-wrapper textarea::placeholder { color: var(--text-muted); }

.input-actions { display: flex; gap: 4px; align-items: center; }
.input-actions button {
  width: 36px; height: 36px; border-radius: 50%;
  border: none; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 16px; transition: all var(--transition-fast);
  background: transparent; color: var(--text-secondary);
}
.input-actions button:hover { background: var(--bg-tertiary); color: var(--text-primary); }

.send-btn {
  background: var(--accent) !important; color: var(--accent-text) !important;
  border-radius: 50% !important;
  transition: all var(--transition-smooth) !important;
}
.send-btn:hover {
  background: var(--accent-hover) !important;
  box-shadow: 0 4px 16px var(--accent-glow);
  transform: scale(1.05);
}
.send-btn:disabled { opacity: 0.35; cursor: not-allowed; transform: none; }

/* ==================== Panel (Image/Music) ==================== */
.panel-overlay {
  position: fixed; inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 200;
  display: none; align-items: center; justify-content: center;
}
.panel-overlay.show { display: flex; }

.panel {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 0.5px solid var(--glass-border);
  border-radius: var(--radius-lg);
  width: 520px; max-width: 95vw;
  padding: 28px;
  box-shadow: var(--shadow-lg);
  animation: fadeUp 0.3s ease;
}
.panel h3 {
  font-size: 20px; margin-bottom: 20px;
  font-family: var(--font-display);
  color: var(--text-primary);
  font-weight: 500;
  letter-spacing: -0.3px;
}
.panel label {
  display: block; font-size: 12px; color: var(--text-secondary);
  margin-bottom: 6px; margin-top: 14px;
  font-family: var(--font-body);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.panel input, .panel select, .panel textarea {
  width: 100%; padding: 10px 14px;
  background: var(--bg-input);
  border: 0.5px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary); font-size: 14px;
  font-family: var(--font-body); outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.panel textarea { resize: vertical; min-height: 80px; }
.panel input:focus, .panel select:focus, .panel textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.panel .btn-row { display: flex; gap: 10px; margin-top: 24px; justify-content: flex-end; }
.panel .btn-row button {
  padding: 10px 24px; border-radius: var(--radius-sm);
  font-size: 14px; font-weight: 600; cursor: pointer;
  border: none; transition: all var(--transition-smooth);
  font-family: var(--font-body);
}
.panel .result {
  margin-top: 20px; padding: 14px;
  background: var(--bg-primary); border-radius: var(--radius-sm);
  display: none;
  border: 0.5px solid var(--border);
}
.panel .result.show { display: block; }
.panel .result img { max-width: 100%; border-radius: var(--radius-sm); }
.panel .result audio { width: 100%; margin-top: 8px; }

/* ==================== Buttons ==================== */
.btn-primary {
  padding: 10px 28px;
  border-radius: var(--radius-sm);
  border: none;
  background: var(--accent);
  color: var(--accent-text);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-smooth);
  font-family: var(--font-body);
  letter-spacing: -0.2px;
}
.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 8px 24px var(--accent-glow);
}
.btn-primary:active { transform: translateY(0); }

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 0.5px solid var(--border);
}
.btn-secondary:hover { background: var(--bg-input); border-color: var(--border-strong); }

.btn-row { display: flex; gap: 8px; flex-wrap: wrap; }
.btn-sm { padding: 6px 14px; font-size: 12px; border-radius: 8px; }

.btn-danger { color: var(--danger) !important; }
.btn-danger:hover {
  background: var(--danger) !important;
  color: #fff !important;
  border-color: var(--danger) !important;
}

/* ==================== Settings Panel ==================== */
.settings-overlay {
  position: fixed; inset: 0; z-index: 500;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center; justify-content: center;
  opacity: 0; pointer-events: none;
  transition: opacity 0.25s ease;
}
.settings-overlay.show { opacity: 1; pointer-events: auto; }

.settings-panel {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 0.5px solid var(--glass-border);
  border-radius: var(--radius-lg);
  width: 540px; max-width: 95vw; max-height: 85vh;
  display: flex; flex-direction: column;
  animation: fadeUp 0.3s ease;
  box-shadow: var(--shadow-lg);
}

.settings-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 24px; border-bottom: 0.5px solid var(--border);
}
.settings-header h3 {
  font-size: 18px; font-family: var(--font-display);
  color: var(--text-primary); margin: 0;
  font-weight: 500; letter-spacing: -0.3px;
}
.settings-close-btn {
  background: none; border: none; color: var(--text-secondary);
  font-size: 18px; cursor: pointer; padding: 6px 10px; border-radius: 8px;
  transition: all var(--transition-fast);
  font-family: var(--font-body);
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
}
.settings-close-btn:hover { background: var(--bg-tertiary); color: var(--text-primary); }

.settings-body {
  padding: 20px 24px; overflow-y: auto; flex: 1;
  display: flex; flex-direction: column; gap: 16px;
}

.settings-group {
  background: var(--bg-secondary);
  border: 0.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
}
.settings-group h4 {
  font-size: 13px; color: var(--accent); margin: 0 0 12px;
  font-family: var(--font-body); font-weight: 600;
}
.settings-group label {
  display: block; font-size: 12px; color: var(--text-secondary);
  margin: 12px 0 4px;
  font-family: var(--font-body);
}
.settings-group label:first-of-type { margin-top: 0; }
.settings-group select {
  width: 100%; padding: 8px 12px; border-radius: 8px;
  border: 0.5px solid var(--border); background: var(--bg-input);
  color: var(--text-primary); font-size: 13px;
  font-family: var(--font-body);
  cursor: pointer; outline: none;
  transition: border-color var(--transition-fast);
}
.settings-group select:focus { border-color: var(--accent); }

/* Settings Inputs */
.settings-group input[type="text"] {
  width: 100%; padding: 8px 12px; border-radius: 8px;
  border: 0.5px solid var(--border); background: var(--bg-input);
  color: var(--text-primary); font-size: 13px;
  font-family: var(--font-body); outline: none;
  transition: border-color var(--transition-fast);
  box-sizing: border-box;
}
.settings-group input[type="text"]:focus { border-color: var(--accent); }
.settings-group textarea {
  width: 100%; padding: 8px 12px; border-radius: 8px;
  border: 0.5px solid var(--border); background: var(--bg-input);
  color: var(--text-primary); font-size: 13px;
  font-family: var(--font-body); outline: none; resize: vertical;
  transition: border-color var(--transition-fast); box-sizing: border-box;
}
.settings-group textarea:focus { border-color: var(--accent); }

.settings-footer {
  padding: 14px 24px; border-top: 0.5px solid var(--border);
  display: flex; justify-content: flex-end;
}

/* Toggle Switch */
.toggle-label {
  display: flex !important; align-items: center; justify-content: space-between;
  cursor: pointer; padding: 6px 0;
}
.toggle-label span { font-size: 13px; color: var(--text-primary); font-family: var(--font-body); }
.toggle-label input[type="checkbox"] {
  appearance: none; -webkit-appearance: none;
  width: 44px; height: 24px; border-radius: 12px;
  background: var(--border); cursor: pointer; position: relative;
  transition: background var(--transition-fast);
  flex-shrink: 0;
}
.toggle-label input[type="checkbox"]::after {
  content: ''; position: absolute;
  width: 18px; height: 18px; border-radius: 50%;
  background: #fff; top: 3px; left: 3px;
  transition: transform var(--transition-fast);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
}
.toggle-label input[type="checkbox"]:checked {
  background: var(--accent);
}
.toggle-label input[type="checkbox"]:checked::after {
  transform: translateX(20px);
}

/* ==================== Range Input ==================== */
.settings-group input[type="range"] {
  width: 100%; margin: 4px 0;
  -webkit-appearance: none; appearance: none;
  height: 6px; border-radius: 3px;
  background: var(--border);
  outline: none; cursor: pointer;
}
.settings-group input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--accent); cursor: pointer;
  border: 2px solid var(--bg-primary);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}
.range-val {
  font-weight: 600; color: var(--accent);
  font-variant-numeric: tabular-nums;
  font-family: var(--font-mono);
  font-size: 13px;
}
.range-hint {
  display: block; font-size: 11px; color: var(--text-muted);
  margin-bottom: 8px;
}

/* ==================== Character Form ==================== */
.char-form {
  margin-top: 12px; padding: 14px;
  border: 0.5px solid var(--border); border-radius: var(--radius-sm);
  background: var(--bg-primary);
}
.char-form label {
  display: block; font-size: 12px; color: var(--text-secondary);
  margin: 10px 0 4px;
  font-family: var(--font-body);
}
.char-form label:first-child { margin-top: 0; }
.char-form select {
  width: 100%; padding: 6px 10px; border-radius: 8px;
  border: 0.5px solid var(--border); background: var(--bg-input);
  color: var(--text-primary); font-size: 13px;
  font-family: var(--font-body); cursor: pointer; outline: none;
}
.char-form select:focus { border-color: var(--accent); }
.char-form input[type="text"] {
  width: 100%; padding: 6px 10px; border-radius: 8px;
  border: 0.5px solid var(--border); background: var(--bg-input);
  color: var(--text-primary); font-size: 13px;
  font-family: var(--font-body); outline: none; box-sizing: border-box;
}
.char-form input[type="text"]:focus { border-color: var(--accent); }
.char-form input[type="range"] { margin: 4px 0; }

.memory-item {
  padding: 6px 10px; margin: 2px 0;
  background: var(--bg-secondary); border-radius: 6px;
  font-size: 12px; border-left: 3px solid var(--accent);
  font-family: var(--font-body);
}

/* ==================== MCP Status & Tools ==================== */
.mcp-status {
  display: flex; align-items: center; gap: 8px;
  margin-top: 8px; font-size: 13px;
  font-family: var(--font-body);
}
.status-dot {
  width: 10px; height: 10px; border-radius: 50%;
  display: inline-block; flex-shrink: 0;
}
.status-dot.on { background: var(--success); box-shadow: 0 0 8px rgba(74, 222, 128, 0.4); }
.status-dot.off { background: var(--text-muted); }

.mcp-tools-list {
  margin-top: 8px; display: flex; flex-wrap: wrap; gap: 4px;
}
.mcp-tool-tag {
  display: inline-block; padding: 4px 10px;
  background: var(--accent-glow); border-radius: var(--radius-full);
  font-size: 11px; color: var(--accent);
  border: 0.5px solid rgba(180, 166, 224, 0.2);
  cursor: help;
  font-family: var(--font-body);
  transition: all var(--transition-fast);
}
.mcp-tool-tag:hover {
  border-color: var(--accent);
  background: rgba(180, 166, 224, 0.2);
}

/* ==================== Loading Dots ==================== */
.loading-dots {
  display: flex; gap: 6px; justify-content: center; padding: 16px;
}
.loading-dots span {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent);
  animation: dotBounce 1.4s infinite ease-in-out both;
}
.loading-dots span:nth-child(1) { animation-delay: -0.32s; }
.loading-dots span:nth-child(2) { animation-delay: -0.16s; }
.loading-dots span:nth-child(3) { animation-delay: 0s; }

@keyframes dotBounce {
  0%, 80%, 100% { transform: scale(0); opacity: 0.3; }
  40% { transform: scale(1); opacity: 1; }
}

.loading-dot {
  display: inline-block; width: 14px; height: 14px; border-radius: 50%;
  border: 2px solid var(--accent); border-top-color: transparent;
  animation: spin 0.8s linear infinite;
  vertical-align: middle; margin-right: 6px;
}
.loading-dot.btn-dot {
  border-color: rgba(0, 0, 0, 0.4); border-top-color: transparent;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ==================== Toast ==================== */
.toast {
  position: fixed; bottom: 80px; left: 50%;
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  color: var(--text-primary);
  border: 0.5px solid var(--glass-border);
  border-radius: var(--radius-full);
  padding: 10px 28px; font-size: 13px;
  box-shadow: var(--shadow-md); z-index: 500;
  opacity: 0; pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease;
  transform: translateX(-50%) translateY(10px);
  font-family: var(--font-body);
}
.toast.show {
  opacity: 1; pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

/* ==================== Think Block ==================== */
.think-block {
  font-style: italic;
}
.think-block::before {
  content: '🧠 推理过程';
  display: block; font-size: 11px; font-weight: 600;
  color: var(--accent); margin-bottom: 6px;
  text-transform: uppercase; letter-spacing: 0.5px;
  font-style: normal;
  font-family: var(--font-body);
}

/* ==================== Download Link ==================== */
.download-link {
  display: inline-block; margin-top: 8px;
  color: var(--accent); text-decoration: none;
  font-size: 13px; font-weight: 600;
  font-family: var(--font-body);
}
.download-link:hover { text-decoration: underline; }

/* ==================== Image Download Button ==================== */
.img-download-btn {
  display: inline-flex; align-items: center; gap: 4px;
  margin-top: 4px; padding: 5px 12px;
  border-radius: 8px; border: 0.5px solid var(--border);
  background: var(--bg-tertiary); color: var(--text-secondary);
  font-size: 12px; cursor: pointer; transition: all var(--transition-fast);
  font-family: var(--font-body); text-decoration: none;
}
.img-download-btn:hover { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }

/* ==================== Progress Bar ==================== */
.progress-bar-wrap {
  width: 100%; height: 4px;
  background: var(--bg-tertiary);
  border-radius: 2px;
  overflow: hidden;
  margin: 14px 0 8px;
}
.progress-bar-fill {
  height: 100%; width: 30%;
  background: var(--accent);
  border-radius: 2px;
  animation: progressSlide 1.4s ease-in-out infinite;
}
@keyframes progressSlide {
  0%   { transform: translateX(-80%); }
  100% { transform: translateX(420%); }
}
.progress-status {
  font-size: 12px; color: var(--text-secondary);
  text-align: center; margin-top: 6px;
  font-family: var(--font-body);
}
.progress-status .elapsed {
  color: var(--accent); font-weight: 600; font-variant-numeric: tabular-nums;
  font-family: var(--font-mono);
}
.progress-status .warn {
  display: block; color: var(--warning); margin-top: 4px;
  animation: fadeUp 0.3s ease;
}

/* ==================== Deerflow Branding ==================== */
.deerflow-brand {
  font-size: 8px; color: var(--text-muted); opacity: 0.35;
  text-decoration: none; transition: opacity 0.3s;
  display: block; text-align: center;
  font-family: var(--font-body);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}
.deerflow-brand:hover { opacity: 0.6; }

/* ==================== Scrollbar ==================== */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--text-muted); border-radius: 2px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-secondary); }

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

/* ==================== Mobile Responsive ==================== */
@media (max-width: 768px) {
  .sidebar {
    position: fixed; left: 0; top: 0; bottom: 0; z-index: 300;
    width: 280px; min-width: 280px;
  }
  .sidebar.collapsed { width: 0; min-width: 0; }
  .message { max-width: 95%; }
  .bubble img { max-width: 100%; }
  .settings-panel { width: 95vw; max-height: 90vh; }
  .panel { width: 95vw; }

  .chat-container { padding: 16px 12px; gap: 16px; }
  .welcome h1 { font-size: 24px; }
  .input-area { padding: 12px 12px 16px; }

  .topbar { padding: 8px 14px; }
  .topbar .topbar-title { display: none; }
}