/* ═══════════════════════════════════════════
   NexusAI — Dual Theme Stylesheet
   ═══════════════════════════════════════════ */

/* ─── Design Tokens (Dark Mode - Default) ─── */
:root {
  --bg-primary: #0a0a0a;
  --bg-secondary: #141414;
  --bg-tertiary: #1e1e1e;
  --bg-elevated: #262626;
  --bg-hover: #2a2a2a;

  --text-primary: #e4e4e7;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;

  --accent: #6366f1;
  --accent-hover: #818cf8;
  --accent-glow: rgba(99, 102, 241, 0.25);
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  --user-bubble: linear-gradient(135deg, #6366f1 0%, #7c3aed 100%);

  --border-subtle: #1f1f23;
  --border-medium: #2e2e35;
  --border-strong: #3f3f46;

  --success: #22c55e;
  --error: #ef4444;
  --warning: #f59e0b;

  --glass-bg: rgba(20, 20, 20, 0.82);
  --glass-border: rgba(255, 255, 255, 0.06);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.55);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --font-sans:
    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "Fira Code", "Cascadia Code", "Consolas", monospace;

  --toolbar-h: 56px;
  --max-w: 780px;
  --transition: 200ms ease;
}

/* ─── Light Mode Theme ─── */
[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f5f5f5;
  --bg-tertiary: #eeeeee;
  --bg-elevated: #e5e5e5;
  --bg-hover: #e0e0e0;

  --text-primary: #1a1a1a;
  --text-secondary: #4a4a4a;
  --text-muted: #7a7a7a;

  --accent: #6366f1;
  --accent-hover: #818cf8;
  --accent-glow: rgba(99, 102, 241, 0.12);
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  --user-bubble: linear-gradient(135deg, #6366f1 0%, #7c3aed 100%);

  --border-subtle: #e0e0e0;
  --border-medium: #d0d0d0;
  --border-strong: #c0c0c0;

  --glass-bg: rgba(255, 255, 255, 0.8);
  --glass-border: rgba(0, 0, 0, 0.08);
}

/* ─── Reset ─── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  height: 100%;
}
body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  height: 100%;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Custom scrollbar */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ─── App Shell ─── */
.app-container {
  display: flex;
  flex-direction: row;
  height: 100vh;
  max-width: 100%;
  position: relative;
  overflow: hidden;
}

/* ─── Sidebar ─── */
.sidebar {
  width: 260px;
  min-width: 260px;
  height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-subtle);
  transition:
    transform 0.3s cubic-bezier(0.4, 0, 0.2, 1),
    opacity 0.3s ease;
  z-index: 200;
  flex-shrink: 0;
  position: relative;
}
/* On mobile, sidebar is hidden by default */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    transform: translateX(-100%);
    width: 280px;
    min-width: 280px;
    box-shadow: var(--shadow-lg);
  }
  /* Show sidebar when open class is added */
  .sidebar.open {
    transform: translateX(0);
    opacity: 1;
    pointer-events: auto;
  }
}
/* On desktop, sidebar is always visible */
@media (min-width: 769px) {
  .sidebar {
    position: relative;
    transform: translateX(0) !important;
    opacity: 1 !important;
    pointer-events: auto !important;
  }
}
/* Fallback for collapsed state (legacy) */
.sidebar.collapsed {
  transform: translateX(-100%);
  opacity: 0;
  pointer-events: none;
}

.sidebar-header {
  padding: 12px;
  border-bottom: 1px solid var(--border-subtle);
  flex-shrink: 0;
}

.new-chat-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--bg-tertiary);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
}
.new-chat-btn:hover {
  background: var(--accent-gradient);
  border-style: solid;
  border-color: var(--accent);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px var(--accent-glow);
}
.new-chat-btn .material-icons-round {
  font-size: 20px;
}

/* Chat List */
.chat-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}

.chat-list-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  margin-bottom: 2px;
  border: 1px solid transparent;
}
.chat-list-item:hover {
  background: var(--bg-hover);
}
.chat-list-item.active {
  background: var(--bg-tertiary);
  border-color: var(--border-medium);
}
.chat-list-item.active::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 60%;
  background: var(--accent-gradient);
  border-radius: 0 3px 3px 0;
}

.chat-list-icon {
  font-size: 18px;
  color: var(--text-muted);
  flex-shrink: 0;
}
.chat-list-item.active .chat-list-icon {
  color: var(--accent);
}

.chat-list-info {
  flex: 1;
  min-width: 0;
  overflow: hidden;
}
.chat-list-title {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.3;
}
.chat-list-date {
  font-size: 10px;
  color: var(--text-muted);
  margin-top: 2px;
}

.chat-list-actions {
  display: flex;
  gap: 2px;
  opacity: 0;
  transition: opacity var(--transition);
  flex-shrink: 0;
}
.chat-list-item:hover .chat-list-actions {
  opacity: 1;
}
.chat-list-item.active .chat-list-actions {
  opacity: 1;
}

.chat-action-btn {
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  color: var(--text-muted);
  border-radius: 4px;
  cursor: pointer;
  transition: all var(--transition);
  padding: 0;
}
.chat-action-btn:hover {
  color: var(--text-primary);
  background: var(--bg-elevated);
}
.chat-action-btn.delete-btn:hover {
  color: var(--error);
}
.chat-action-btn .material-icons-round {
  font-size: 15px;
}

/* Sidebar Footer */
.sidebar-footer {
  padding: 8px 12px;
  border-top: 1px solid var(--border-subtle);
  flex-shrink: 0;
}
.sidebar-footer-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 12px;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.sidebar-footer-btn:hover {
  color: var(--error);
  background: rgba(239, 68, 68, 0.08);
}
.sidebar-footer-btn .material-icons-round {
  font-size: 18px;
}

/* Sidebar Overlay (mobile) */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 150;
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.sidebar-overlay.visible {
  display: block;
  opacity: 1;
  pointer-events: auto;
  animation: fadeIn 0.2s ease;
}

/* Rename input in sidebar */
.chat-rename-input {
  width: 100%;
  padding: 2px 6px;
  background: var(--bg-tertiary);
  border: 1px solid var(--accent);
  border-radius: 4px;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 13px;
  outline: none;
}

/* ─── Main Content ─── */
.main-content {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-width: 0;
  height: 100vh;
  transition: margin-left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ─── Toolbar ─── */
.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--toolbar-h);
  padding: 0 16px;
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--glass-border);
  position: sticky;
  top: 0;
  z-index: 100;
  flex-shrink: 0;
}
.toolbar-left {
  display: flex;
  align-items: center;
  gap: 8px;
}
.logo-icon {
  font-size: 26px;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.logo-text {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.3px;
}
.toolbar-center {
  flex: 1;
  display: flex;
  justify-content: center;
  padding: 0 12px;
}
.toolbar-right {
  display: flex;
  align-items: center;
  gap: 4px;
}

#model-select {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
  padding: 7px 32px 7px 12px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  outline: none;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23a1a1aa'%3E%3Cpath d='M6 8.5L1 3.5h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  min-width: 180px;
  max-width: 260px;
  transition: border-color var(--transition);
}
#model-select:hover {
  border-color: var(--accent);
}
#model-select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-glow);
}
#model-select optgroup {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-weight: 600;
}
#model-select option {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  padding: 6px;
}

.icon-btn {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
}
.icon-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}
.icon-btn .material-icons-round {
  font-size: 20px;
}

/* ─── Chat Area ─── */
.chat-area {
  flex: 1;
  overflow-y: auto;
  scroll-behavior: smooth;
  padding: 0 16px;
}

/* ─── Welcome Screen ─── */
.welcome-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: calc(100vh - var(--toolbar-h) - 140px);
  padding: 40px 20px;
  animation: fadeInUp 0.5s ease;
}
.welcome-icon .material-icons-round {
  font-size: 56px;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 16px;
}
.welcome-screen h2 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 8px;
}
.welcome-sub {
  color: var(--text-secondary);
  font-size: 15px;
  margin-bottom: 32px;
}
.quick-prompts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  max-width: 480px;
  width: 100%;
}
.quick-prompt {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  padding: 14px 16px;
  font-family: var(--font-sans);
  font-size: 13px;
  text-align: left;
  cursor: pointer;
  transition: all var(--transition);
}
.quick-prompt:hover {
  background: var(--bg-elevated);
  border-color: var(--accent);
  transform: translateY(-1px);
}

/* ─── Messages ─── */
.messages-container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 24px 0 32px;
}
.message-row {
  display: flex;
  gap: 12px;
  padding: 20px 0;
  animation: fadeInUp 0.35s ease;
  position: relative;
}
.message-row + .message-row {
  border-top: 1px solid var(--border-subtle);
}
.message-row.user-row {
  justify-content: flex-end;
}

.message-avatar {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 600;
}
.message-avatar.ai-avatar {
  background: var(--accent-gradient);
  color: #fff;
}
.message-avatar.user-avatar {
  background: var(--bg-elevated);
  color: var(--text-secondary);
}

.message-content {
  flex: 1;
  min-width: 0;
  max-width: 100%;
}
.message-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}
.message-sender {
  font-size: 13px;
  font-weight: 600;
}
.message-time {
  font-size: 11px;
  color: var(--text-muted);
}
.message-model-badge {
  font-size: 10px;
  color: var(--accent);
  background: var(--accent-glow);
  padding: 2px 7px;
  border-radius: var(--radius-full);
  font-weight: 500;
}

.message-body {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-primary);
  word-break: break-word;
}
.message-body p {
  margin-bottom: 10px;
}
.message-body p:last-child {
  margin-bottom: 0;
}
.message-body ul,
.message-body ol {
  padding-left: 20px;
  margin-bottom: 10px;
}
.message-body li {
  margin-bottom: 4px;
}
.message-body a {
  color: var(--accent-hover);
  text-decoration: underline;
}
.message-body strong {
  font-weight: 600;
}
.message-body blockquote {
  border-left: 3px solid var(--accent);
  padding: 4px 12px;
  margin: 8px 0;
  background: rgba(99, 102, 241, 0.06);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.message-body img {
  max-width: 100%;
  border-radius: var(--radius-md);
  margin: 8px 0;
}
.message-body hr {
  border: none;
  border-top: 1px solid var(--border-medium);
  margin: 16px 0;
}

/* User message bubble */
.user-bubble {
  background: var(--user-bubble);
  color: #fff;
  padding: 12px 18px;
  border-radius: var(--radius-lg) var(--radius-lg) 4px var(--radius-lg);
  max-width: 75%;
  font-size: 15px;
  line-height: 1.6;
  word-break: break-word;
  display: inline-block;
}
.user-bubble img.user-attachment {
  max-width: 240px;
  border-radius: var(--radius-sm);
  margin-top: 8px;
  display: block;
}

/* Code blocks */
.message-body pre {
  position: relative;
  margin: 12px 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: #161b22 !important;
}
.message-body pre code {
  display: block;
  padding: 16px !important;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.55;
  overflow-x: auto;
  background: #161b22 !important;
}
.message-body code:not(pre code) {
  background: var(--bg-elevated);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: #e9b0ff;
}
.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 12px;
  background: #1c2331;
  font-size: 12px;
  color: var(--text-muted);
}
.copy-code-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 12px;
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 2px 6px;
  border-radius: 4px;
  transition: all var(--transition);
}
.copy-code-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.06);
}
.copy-code-btn .material-icons-round {
  font-size: 14px;
}

/* Message actions */
.message-actions {
  display: flex;
  gap: 2px;
  margin-top: 8px;
  opacity: 0;
  transition: opacity var(--transition);
}
.message-row:hover .message-actions {
  opacity: 1;
}
.msg-action-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 4px 8px;
  font-size: 12px;
  font-family: var(--font-sans);
  display: flex;
  align-items: center;
  gap: 4px;
  transition: all var(--transition);
}
.msg-action-btn:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
  border-color: var(--border-medium);
}
.msg-action-btn .material-icons-round {
  font-size: 15px;
}

/* Typing indicator */
.typing-indicator {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 8px 0;
}
.typing-dot {
  width: 8px;
  height: 8px;
  background: var(--text-muted);
  border-radius: 50%;
  animation: typingBounce 1.4s ease-in-out infinite;
}
.typing-dot:nth-child(2) {
  animation-delay: 0.16s;
}
.typing-dot:nth-child(3) {
  animation-delay: 0.32s;
}

/* ─── Attachments Bar ─── */
.attachments-bar {
  max-width: var(--max-w);
  margin: 0 auto;
  width: 100%;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0 16px;
}
.attachments-bar:empty {
  display: none;
}
.attachment-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  font-size: 12px;
  animation: fadeInUp 0.2s ease;
}
.attachment-chip img {
  width: 40px;
  height: 40px;
  object-fit: cover;
  border-radius: 4px;
}
.remove-attachment {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0;
  display: flex;
  align-items: center;
}
.remove-attachment:hover {
  color: var(--error);
}
.remove-attachment .material-icons-round {
  font-size: 16px;
}

/* ─── Input Area ─── */
.input-area {
  padding: 12px 16px 8px;
  flex-shrink: 0;
  position: relative;
}
.input-wrapper {
  max-width: var(--max-w);
  margin: 0 auto;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xl);
  padding: 6px 6px 6px 12px;
  transition:
    border-color var(--transition),
    box-shadow var(--transition);
}
.input-wrapper:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.input-row {
  display: flex;
  align-items: flex-end;
  gap: 4px;
}

#user-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.5;
  padding: 8px 4px;
  resize: none;
  max-height: 180px;
}
#user-input::placeholder {
  color: var(--text-muted);
}

.input-icon-btn {
  width: 34px;
  height: 34px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  color: var(--text-muted);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition);
}
.input-icon-btn:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}
.input-icon-btn .material-icons-round {
  font-size: 20px;
}
.input-icon-btn.recording {
  color: var(--error);
  animation: pulse 1.2s ease-in-out infinite;
}

.send-btn {
  width: 34px;
  height: 34px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent);
  border: none;
  color: #fff;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition);
  opacity: 0.4;
  pointer-events: none;
}
.send-btn.active {
  opacity: 1;
  pointer-events: auto;
}
.send-btn.active:hover {
  background: var(--accent-hover);
  transform: scale(1.05);
}
.send-btn .material-icons-round {
  font-size: 20px;
}

.disclaimer {
  text-align: center;
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 6px;
  padding-bottom: 2px;
}
.disclaimer code {
  font-family: var(--font-mono);
  background: var(--bg-elevated);
  padding: 1px 4px;
  border-radius: 3px;
  font-size: 10px;
}

/* ─── Stop Button ─── */
.stop-btn {
  position: fixed;
  bottom: 120px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  color: var(--text-primary);
  border-radius: var(--radius-full);
  padding: 8px 20px;
  font-family: var(--font-sans);
  font-size: 13px;
  cursor: pointer;
  z-index: 50;
  box-shadow: var(--shadow-md);
  transition: all var(--transition);
  animation: fadeInUp 0.2s ease;
}
.stop-btn:hover {
  background: var(--bg-hover);
  border-color: var(--error);
  color: var(--error);
}
.stop-btn .material-icons-round {
  font-size: 16px;
}

/* ─── Modal ─── */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.modal-overlay.open {
  display: flex;
  animation: fadeIn 0.2s ease;
}
.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 520px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
  animation: slideUp 0.25s ease;
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--border-subtle);
}
.modal-header h2 {
  font-size: 18px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}
.modal-header h2 .material-icons-round {
  font-size: 22px;
  color: var(--accent);
}
.modal-close-btn {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
}
.modal-close-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}
.modal-body {
  padding: 20px 24px;
  overflow-y: auto;
  flex: 1;
}
.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: flex-end;
}

.settings-section {
  margin-bottom: 20px;
}
.settings-section-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 10px;
}
.settings-field {
  margin-bottom: 12px;
}
.settings-field label {
  display: block;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 4px;
}
.settings-field input {
  width: 100%;
  padding: 9px 12px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 13px;
  outline: none;
  transition: border-color var(--transition);
}
.settings-field input:focus {
  border-color: var(--accent);
}
.settings-field .field-note {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 3px;
}
.settings-field .field-note.warning {
  color: var(--warning);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 9px 24px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
}
.btn-primary:hover {
  background: var(--accent-hover);
}

/* ─── Toast ─── */
#toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.toast {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
  padding: 10px 18px;
  font-size: 13px;
  box-shadow: var(--shadow-md);
  animation: slideInRight 0.3s ease;
  display: flex;
  align-items: center;
  gap: 8px;
}
.toast.success {
  border-left: 3px solid var(--success);
}
.toast.error {
  border-left: 3px solid var(--error);
}
.toast.info {
  border-left: 3px solid var(--accent);
}

/* ─── Edit mode ─── */
.edit-textarea {
  width: 100%;
  padding: 10px 12px;
  background: var(--bg-tertiary);
  border: 1px solid var(--accent);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.6;
  resize: vertical;
  outline: none;
  min-height: 60px;
}
.edit-actions {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}
.edit-actions button {
  padding: 5px 14px;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 12px;
  cursor: pointer;
  border: 1px solid var(--border-medium);
  transition: all var(--transition);
}
.edit-save {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent) !important;
}
.edit-save:hover {
  background: var(--accent-hover);
}
.edit-cancel {
  background: transparent;
  color: var(--text-secondary);
}
.edit-cancel:hover {
  background: var(--bg-hover);
}

/* Generated image in chat */
.generated-image-container {
  margin-top: 8px;
}
.generated-image-container img {
  max-width: 400px;
  width: 100%;
  border-radius: var(--radius-md);
  cursor: pointer;
}
.image-gen-status {
  color: var(--text-muted);
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.image-gen-status .spinner {
  width: 14px;
  height: 14px;
  border: 2px solid var(--border-medium);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* ─── Keyframes ─── */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(40px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}
@keyframes typingBounce {
  0%,
  60%,
  100% {
    transform: translateY(0);
  }
  30% {
    transform: translateY(-8px);
  }
}
@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.4;
  }
}
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ─── Responsive ─── */

/* Mobile improvements - Extra small screens */
@media (max-width: 480px) {
  :root {
    --toolbar-h: 52px;
  }
  
  .sidebar {
    width: 100vw !important;
    max-width: 320px;
  }
  
  .toolbar {
    padding: 0 12px;
  }
  
  .toolbar-left {
    gap: 6px;
  }
  
  .logo-icon {
    font-size: 22px;
  }
  
  .logo-text {
    display: none;
  }
  
  .toolbar-center {
    padding: 0 8px;
  }
  
  #model-select {
    min-width: 120px;
    max-width: 160px;
    padding: 6px 28px 6px 10px;
    font-size: 12px;
  }
  
  .input-area {
    padding: 8px;
  }
  
  .messages-container {
    padding: 12px 8px;
  }
  
  .message-wrapper {
    padding: 8px 0;
  }
}

/* Mobile improvements - Small screens (portrait phones) */
@media (max-width: 640px) {
  #model-select {
    min-width: 140px;
    max-width: 180px;
  }
}

/* Tablet and up - Hide overlay, show sidebar */
@media (min-width: 769px) {
  .sidebar-overlay {
    display: none !important;
  }
  
  .sidebar {
    position: relative !important;
    transform: translateX(0) !important;
    opacity: 1 !important;
    pointer-events: auto !important;
  }
  
  .logo-text {
    display: block;
  }
}

@media (max-width: 640px) {
  .toolbar {
    padding: 0 10px;
  }
  .logo-text {
    display: none;
  }
  #model-select {
    min-width: 140px;
    font-size: 12px;
  }
  .welcome-screen h2 {
    font-size: 22px;
  }
  .quick-prompts {
    grid-template-columns: 1fr;
  }
  .chat-area {
    padding: 0 6px;
  }
  .input-area {
    padding: 8px 8px 6px;
  }
  .input-wrapper {
    padding: 4px 4px 4px 8px;
  }
  .user-bubble {
    max-width: 88%;
  }
  .message-actions {
    opacity: 1;
  }
  .stop-btn {
    bottom: 100px;
  }
}

/* ─── Light Mode Code Block Styling ─── */
[data-theme="light"] .message-body pre {
  background: #f5f5f5 !important;
  border: 1px solid var(--border-medium);
}

[data-theme="light"] .message-body pre code {
  background: #f5f5f5 !important;
  color: #24292e;
}

[data-theme="light"] .code-header {
  background: #efefef;
  border-bottom: 1px solid var(--border-medium);
}

[data-theme="light"] .message-body code:not(pre code) {
  background: #f0f0f0;
  color: #7e3ccd;
}