/* ════════════════════════════════════════
   AI Chat — Modern UI
   ════════════════════════════════════════ */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
.hidden { display: none !important; }

:root {
  --bg-app: #18181b;
  --bg-sidebar: #0f0f11;
  --bg-main: #18181b;
  --bg-surface: #232326;
  --bg-surface-hover: #2a2a2e;
  --bg-input: #232326;
  --bg-input-focus: #2a2a2e;
  --bg-code: #0d0d0f;
  --bg-modal: #1e1e21;
  --bg-code-header: #141417;
  --bg-user-msg: #2a2a2e;
  --bg-suggestion: #232326;
  --bg-suggestion-hover: #2a2a2e;
  --bg-file-preview: #2a2a2e;
  --bg-divider: rgba(255,255,255,0.04);

  --border: #2e2e32;
  --border-light: #3a3a3f;
  --border-input: #3a3a3f;
  --border-input-focus: #52525b;

  --text: #fafafa;
  --text-secondary: #a1a1aa;
  --text-tertiary: #71717a;
  --text-on-accent: #ffffff;

  --accent: #8b5cf6;
  --accent-hover: #a78bfa;
  --accent-soft: rgba(139, 92, 246, 0.12);
  --accent-glow: rgba(139, 92, 246, 0.25);

  --green: #22c55e;
  --green-soft: rgba(34, 197, 94, 0.1);
  --danger: #ef4444;
  --danger-soft: rgba(239, 68, 68, 0.1);

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.5);
  --shadow-input: 0 1px 3px rgba(0,0,0,0.2);

  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;

  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --mono: 'SF Mono', 'Cascadia Code', 'JetBrains Mono', 'Consolas', monospace;

  --sidebar-w: 280px;
  --topbar-h: 52px;
  --input-max-h: 200px;
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

html.light {
  --bg-app: #f4f4f5;
  --bg-sidebar: #ffffff;
  --bg-main: #f4f4f5;
  --bg-surface: #ffffff;
  --bg-surface-hover: #f0f0f2;
  --bg-input: #ffffff;
  --bg-input-focus: #ffffff;
  --bg-code: #f6f8fa;
  --bg-modal: #ffffff;
  --bg-code-header: #e8e8ec;
  --bg-user-msg: #f0f0f2;
  --bg-suggestion: #ffffff;
  --bg-suggestion-hover: #f0f0f2;
  --bg-file-preview: #f0f0f2;
  --bg-divider: rgba(0,0,0,0.04);

  --border: #e4e4e7;
  --border-light: #e8e8ec;
  --border-input: #d4d4d8;
  --border-input-focus: #a1a1aa;

  --text: #18181b;
  --text-secondary: #52525b;
  --text-tertiary: #a1a1aa;
  --text-on-accent: #ffffff;

  --accent: #7c3aed;
  --accent-hover: #6d28d9;
  --accent-soft: rgba(124, 58, 237, 0.08);
  --accent-glow: rgba(124, 58, 237, 0.15);

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
  --shadow-input: 0 1px 3px rgba(0,0,0,0.05);
}

html, body {
  height: 100%;
  font-family: var(--font);
  background: var(--bg-app);
  color: var(--text);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background var(--transition), color var(--transition);
}

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

#app { display: flex; height: 100vh; overflow: hidden; position: relative; }

/* ── Sidebar Overlay ── */
.sidebar-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
  z-index: 19;
  opacity: 0; pointer-events: none;
  transition: opacity 0.3s ease;
}
.sidebar-overlay.visible { opacity: 1; pointer-events: auto; }

/* ── Sidebar ── */
.sidebar {
  width: var(--sidebar-w);
  min-width: var(--sidebar-w);
  background: var(--bg-sidebar);
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
  z-index: 20;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
/* Desktop: hide sidebar when not open */
@media (min-width: 769px) {
  .sidebar:not(.open) {
    transform: translateX(-100%);
    margin-left: calc(-1 * var(--sidebar-w));
  }
}
.sidebar-header { padding: 16px; border-bottom: 1px solid var(--border); }
.sidebar-footer { padding: 12px 16px; margin-top: auto; border-top: 1px solid var(--border); }

.chat-list { flex: 1; overflow-y: auto; padding: 8px; }
.chat-list::-webkit-scrollbar { width: 4px; }
.chat-list::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.chat-item {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 12px; border-radius: var(--radius);
  cursor: pointer; transition: all var(--transition);
  position: relative; margin-bottom: 2px;
}
.chat-item:hover { background: var(--bg-surface-hover); }
.chat-item.active { background: var(--accent-soft); color: var(--accent); }
.chat-item-title {
  flex: 1; overflow: hidden;
  text-overflow: ellipsis; white-space: nowrap;
  font-size: 13.5px;
}
.chat-item-delete {
  opacity: 0; background: none; border: none;
  color: var(--text-tertiary); cursor: pointer;
  padding: 4px 6px; border-radius: var(--radius-sm);
  line-height: 1; transition: all var(--transition); flex-shrink: 0;
}
.chat-item:hover .chat-item-delete { opacity: 1; }
.chat-item-delete:hover { color: var(--danger); background: var(--danger-soft); }

/* ── Main ── */
.main {
  flex: 1; display: flex; flex-direction: column;
  min-width: 0; background: var(--bg-main);
  position: relative; transition: background var(--transition);
}

/* ── Topbar ── */
.topbar {
  height: var(--topbar-h); min-height: var(--topbar-h);
  display: flex; align-items: center; padding: 0 16px; gap: 10px;
  background: var(--bg-main); backdrop-filter: blur(12px);
  transition: background var(--transition); z-index: 10;
}
.topbar-spacer { flex: 1; }
.model-badge {
  font-size: 12.5px; color: var(--text-secondary);
  background: var(--bg-surface); padding: 4px 12px;
  border-radius: 20px; white-space: nowrap;
  border: 1px solid var(--border); font-weight: 500;
}

/* ── Chat Container ── */
.chat-container {
  flex: 1; overflow-y: auto; scroll-behavior: smooth;
  position: relative;
}

/* ── Welcome Screen ── */
.welcome-screen {
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  height: 100%; text-align: center;
  padding: 40px 20px;
  animation: fadeUp 0.5s ease;
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: none; }
}
.welcome-logo { margin-bottom: 20px; }
.welcome-screen h1 {
  font-size: 28px; font-weight: 700;
  letter-spacing: -0.5px; margin-bottom: 8px;
  background: linear-gradient(135deg, var(--text), var(--accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.welcome-sub { color: var(--text-tertiary); font-size: 14.5px; margin-bottom: 36px; }
.suggestion-grid {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 10px; max-width: 520px; width: 100%;
}
.suggestion-card {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 16px; background: var(--bg-suggestion);
  border: 1px solid var(--border); border-radius: var(--radius-lg);
  color: var(--text); font-size: 13.5px; font-family: var(--font);
  cursor: pointer; transition: all var(--transition);
  text-align: left; line-height: 1.3;
}
.suggestion-card:hover {
  background: var(--bg-suggestion-hover);
  border-color: var(--border-light);
  transform: translateY(-1px); box-shadow: var(--shadow-sm);
}
.suggestion-card:active { transform: translateY(0); }
.suggestion-icon { font-size: 20px; flex-shrink: 0; width: 28px; text-align: center; }
.welcome-screen.hidden { display: none; }

/* ════════════════════════════════════════
   Messages — improved
   ════════════════════════════════════════ */
.messages {
  max-width: 768px;
  margin: 0 auto;
  padding: 0 20px;
}

.message {
  padding: 18px 0;
  display: flex;
  gap: 14px;
  animation: fadeUp 0.3s ease;
}

/* User message — bubble style */
.message.user {
  flex-direction: row-reverse;
}
.message.user .message-avatar {
  background: var(--bg-surface);
  color: var(--text);
  border: 1px solid var(--border);
}
.message.user .message-content {
  background: var(--bg-user-msg);
  padding: 10px 16px;
  border-radius: 18px 18px 4px 18px;
  max-width: 80%;
  display: inline-block;
  border: 1px solid var(--border);
}
.message.user .message-content br + br { margin-bottom: 0.3em; }

/* AI/assistant message */
.message.assistant .message-avatar {
  background: var(--accent);
  color: var(--text-on-accent);
  box-shadow: 0 0 8px var(--accent-glow);
}
.message.assistant .message-avatar svg {
  width: 20px; height: 20px;
}
.message.assistant .message-content {
  padding: 14px 18px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  background: var(--bg-surface);
  position: relative;
  box-shadow: var(--shadow-sm);
}

.message.assistant .message-body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

/* AI message action bar */
.message.assistant .message-actions {
  display: flex;
  gap: 4px;
  margin-top: 6px;
  opacity: 0;
  transition: opacity var(--transition);
}
.message.assistant:hover .message-actions,
.message.assistant .message-actions.visible {
  opacity: 1;
}
.msg-action-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 10px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--text-tertiary);
  font-size: 12px;
  font-family: var(--font);
  cursor: pointer;
  transition: all var(--transition);
}
.msg-action-btn:hover {
  color: var(--text-secondary);
  background: var(--bg-surface-hover);
  border-color: var(--border);
}
.msg-action-btn.copied {
  color: var(--green);
}

/* Avatar shared */
.message-avatar {
  width: 30px; height: 30px; min-width: 30px;
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700;
  letter-spacing: 0.3px; margin-top: 2px;
}

.message-content { flex: 1; min-width: 0; line-height: 1.7; font-size: 15px; }
.message-content p { margin-bottom: 0.75em; }
.message-content p:last-child { margin-bottom: 0; }
.message-content ul, .message-content ol { margin: 0.5em 0; padding-left: 1.5em; }
.message-content li { margin-bottom: 0.3em; }

/* Attached files in message */
.message-files {
  display: flex; flex-wrap: wrap; gap: 6px;
  margin-bottom: 8px;
}
.message-file-tag {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 10px; background: var(--bg-surface);
  border: 1px solid var(--border); border-radius: 8px;
  font-size: 12px; color: var(--text-secondary);
}
.message-file-tag .file-icon { font-size: 14px; }
.message-file-tag .file-size { color: var(--text-tertiary); font-size: 11px; }

/* Code blocks */
.message-content pre {
  background: var(--bg-code); border-radius: var(--radius);
  overflow: hidden; margin: 0.75em 0;
  border: 1px solid var(--border);
}
.message-content pre code {
  display: block; padding: 14px 16px; overflow-x: auto;
  font-family: var(--mono); font-size: 13.5px; line-height: 1.55;
}
.message-content :not(pre) > code {
  background: var(--bg-surface); padding: 2px 6px;
  border-radius: 5px; font-family: var(--mono);
  font-size: 0.85em; border: 1px solid var(--border);
}
.message-content blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 14px; color: var(--text-secondary);
  margin: 0.5em 0;
}
.message-content table {
  border-collapse: collapse; margin: 0.75em 0;
  width: 100%; font-size: 14px;
}
.message-content th, .message-content td {
  border: 1px solid var(--border); padding: 8px 12px; text-align: left;
}
.message-content th { background: var(--bg-surface); font-weight: 600; }
.message-content a { color: var(--accent); text-decoration: none; }
.message-content a:hover { text-decoration: underline; }
.message-content h1, .message-content h2, .message-content h3,
.message-content h4, .message-content h5, .message-content h6 {
  margin: 1.2em 0 0.5em; font-weight: 650; line-height: 1.3;
}
.message-content h1 { font-size: 1.5em; }
.message-content h2 { font-size: 1.3em; }
.message-content h3 { font-size: 1.15em; }
.message-content hr { border: none; border-top: 1px solid var(--border); margin: 1em 0; }
.message-content img { max-width: 100%; border-radius: var(--radius); }
.message-content input[type="checkbox"] { margin-right: 6px; accent-color: var(--accent); }

/* Error */
.message.error .message-content {
  color: var(--danger); background: var(--danger-soft);
  padding: 10px 14px; border-radius: var(--radius);
  font-size: 13.5px;
}

/* ── Typing Indicator — inside message area with avatar ── */
.typing-indicator {
  display: flex;
  gap: 14px;
  padding: 18px 20px;
  align-items: flex-start;
  max-width: 768px;
  margin: 0 auto;
}
.typing-indicator.hidden { display: none; }

.typing-avatar {
  width: 30px; height: 30px; min-width: 30px;
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700;
  background: var(--accent); color: #fff;
  box-shadow: 0 0 8px var(--accent-glow);
  margin-top: 2px;
}
.typing-avatar svg { width: 20px; height: 20px; }

.typing-bubble {
  display: flex; align-items: center;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 10px 16px;
  gap: 4px;
}
.typing-bubble span {
  width: 7px; height: 7px;
  background: var(--text-tertiary);
  border-radius: 50%;
  animation: typingBounce 1.4s ease-in-out infinite;
}
.typing-bubble span:nth-child(2) { animation-delay: 0.15s; }
.typing-bubble span:nth-child(3) { animation-delay: 0.3s; }
@keyframes typingBounce {
  0%, 80%, 100% { transform: scale(0.7); opacity: 0.3; }
  40% { transform: scale(1); opacity: 1; }
}

/* ════════════════════════════════════════
   Input Area
   ════════════════════════════════════════ */
.input-area {
  max-width: 768px;
  margin: 0 auto;
  width: 100%;
  padding: 0 20px 24px;
  position: relative;
}

.input-wrapper {
  display: flex;
  align-items: flex-end;
  background: var(--bg-input);
  border: 1px solid var(--border-input);
  border-radius: var(--radius-lg);
  padding: 6px;
  gap: 2px;
  transition: all var(--transition);
  box-shadow: var(--shadow-input);
}
.input-wrapper:focus-within {
  border-color: var(--border-input-focus);
  box-shadow: var(--shadow-md), 0 0 0 3px var(--accent-soft);
  background: var(--bg-input-focus);
}

/* File preview bar above input */
.file-preview-bar {
  display: flex;
  gap: 8px;
  padding: 8px 0;
  flex-wrap: wrap;
}
.file-preview-bar.hidden { display: none; }

.file-preview-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px 6px 10px;
  background: var(--bg-file-preview);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 12.5px;
  color: var(--text-secondary);
  animation: fadeUp 0.2s ease;
}
.file-preview-chip .chip-icon { font-size: 16px; }
.file-preview-chip .chip-name { max-width: 120px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file-preview-chip .chip-size { color: var(--text-tertiary); font-size: 11px; }
.file-preview-chip .chip-remove {
  background: none; border: none; color: var(--text-tertiary);
  cursor: pointer; padding: 2px; border-radius: 4px;
  transition: all var(--transition); display: flex;
  align-items: center; justify-content: center;
}
.file-preview-chip .chip-remove:hover { color: var(--danger); background: var(--danger-soft); }

#message-input {
  flex: 1; background: none; border: none; outline: none;
  color: var(--text); font-size: 15px; font-family: var(--font);
  line-height: 1.5; resize: none; max-height: var(--input-max-h);
  padding: 8px 10px;
}
#message-input::placeholder { color: var(--text-tertiary); }

.input-icon-btn {
  padding: 8px; margin: 0 2px;
  color: var(--text-tertiary);
  transition: color var(--transition);
  flex-shrink: 0;
}
.input-icon-btn:hover { color: var(--text-secondary); }

.btn-send {
  background: var(--accent);
  border: none;
  border-radius: var(--radius);
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: all var(--transition);
  flex-shrink: 0;
}
.btn-send:hover:not(:disabled) { background: var(--accent-hover); }
.btn-send:disabled { opacity: 0.35; cursor: not-allowed; }
.btn-send:active:not(:disabled) { transform: scale(0.95); }
.btn-send.stop { background: var(--bg-surface-hover); }
.btn-send.stop svg { display: none; }
.btn-send.stop::after {
  content: '';
  display: block;
  width: 12px; height: 12px;
  background: var(--text-secondary);
  border-radius: 3px;
}

.input-hint {
  text-align: center; font-size: 11.5px;
  color: var(--text-tertiary); margin-top: 10px;
}

/* Hidden file input */
#file-input { display: none; }

/* ════════════════════════════════════════
   Custom Dropdown Select Menu
   ════════════════════════════════════════ */
.select-menu {
  width: 100%;
  position: relative;
}
.select-menu .select-btn {
  display: flex;
  height: 40px;
  background: var(--bg-surface);
  border: 1px solid var(--border-input);
  padding: 0 14px;
  font-size: 14px;
  border-radius: var(--radius);
  align-items: center;
  cursor: pointer;
  justify-content: space-between;
  transition: all var(--transition);
}
.select-menu .select-btn:hover {
  border-color: var(--border-input-focus);
}
.select-menu.active .select-btn {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.select-btn-content {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}
.provider-btn-icon {
  width: 20px;
  height: 20px;
  object-fit: contain;
  flex-shrink: 0;
}
.sBtn-text {
  font-size: 14px;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.select-chevron {
  color: var(--text-tertiary);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}
.select-menu.active .select-chevron {
  transform: rotate(-180deg);
}

.select-menu .options {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  padding: 6px;
  border-radius: var(--radius);
  background: var(--bg-surface);
  border: 1px solid var(--border-input);
  box-shadow: var(--shadow-lg);
  display: none;
  list-style: none;
  z-index: 1000;
  max-height: 280px;
  overflow-y: auto;
}
.select-menu.active .options {
  display: block;
  animation: dropdownFade 0.2s ease;
}
@keyframes dropdownFade {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

.options .option {
  display: flex;
  height: 44px;
  cursor: pointer;
  padding: 0 12px;
  border-radius: var(--radius-sm);
  align-items: center;
  gap: 10px;
  transition: background var(--transition);
}
.options .option:hover {
  background: var(--bg-surface-hover);
}
.options .option.selected {
  background: var(--accent-soft);
  color: var(--accent);
}
.option .option-icon {
  width: 20px;
  height: 20px;
  object-fit: contain;
  flex-shrink: 0;
}
.option .option-text {
  font-size: 14px;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.option .option-divider {
  flex: 1;
}

/* Custom provider option styling */
.option.custom-option {
  border-top: 1px solid var(--border);
  margin-top: 4px;
  padding-top: 10px;
}
.option.custom-option .option-icon {
  opacity: 0.7;
}

/* ════════════════════════════════════════
   Code Block Header
   ════════════════════════════════════════ */
.code-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 6px 14px; background: var(--bg-code-header);
  border-bottom: 1px solid var(--border);
  font-size: 12px; color: var(--text-tertiary);
  font-family: var(--mono); border-radius: var(--radius) var(--radius) 0 0;
}
.code-header button {
  background: none; border: 1px solid var(--border);
  color: var(--text-tertiary); cursor: pointer;
  font-size: 11px; font-family: var(--font);
  padding: 2px 10px; border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.code-header button:hover { color: var(--text); background: var(--bg-surface-hover); border-color: var(--border-light); }
.code-header button.copied { color: var(--green); border-color: rgba(34,197,94,0.3); }

/* ════════════════════════════════════════
   Buttons
   ════════════════════════════════════════ */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px; padding: 9px 16px; border-radius: var(--radius);
  font-size: 13.5px; font-weight: 500; cursor: pointer;
  border: none; transition: all var(--transition);
  white-space: nowrap; font-family: var(--font);
}
.btn-primary { background: var(--accent); color: var(--text-on-accent); }
.btn-primary:hover { background: var(--accent-hover); box-shadow: var(--shadow-sm); }
.btn-ghost { background: transparent; color: var(--text-secondary); }
.btn-ghost:hover { background: var(--bg-surface-hover); color: var(--text); }
.btn-icon {
  background: transparent; color: var(--text-secondary);
  padding: 8px; border-radius: var(--radius-sm);
  transition: all var(--transition);
  display: flex; align-items: center; justify-content: center;
}
.btn-icon:hover { background: var(--bg-surface-hover); color: var(--text); }
.btn-full { width: 100%; }

/* ════════════════════════════════════════
   Modal
   ════════════════════════════════════════ */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.55); backdrop-filter: blur(6px);
  display: flex; align-items: center; justify-content: center;
  z-index: 100; padding: 20px;
}
.modal-overlay.hidden { display: none; }
.modal {
  background: var(--bg-modal); border: 1px solid var(--border);
  border-radius: var(--radius-xl); width: 460px; max-width: 100%;
  max-height: 85vh; overflow-y: auto; box-shadow: var(--shadow-lg);
  animation: modalSlide 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}
@keyframes modalSlide {
  from { opacity: 0; transform: scale(0.95) translateY(10px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}
.modal-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 22px; border-bottom: 1px solid var(--border);
}
.modal-header h2 { font-size: 17px; font-weight: 650; }
.modal-body { padding: 20px 22px; }
.modal-footer {
  padding: 14px 22px; border-top: 1px solid var(--border);
  display: flex; gap: 8px; justify-content: flex-end;
}

.settings-row { margin-bottom: 18px; }
.settings-row:last-child { margin-bottom: 0; }
.settings-row label {
  display: block; margin-bottom: 6px;
  font-size: 13px; font-weight: 500; color: var(--text-secondary);
}
.label-hint { font-weight: 400; font-size: 11.5px; color: var(--text-tertiary); }

.settings-row select,
.settings-row input[type="text"],
.settings-row input[type="password"],
.settings-row textarea {
  width: 100%; padding: 9px 12px;
  background: var(--bg-surface); border: 1px solid var(--border-input);
  border-radius: var(--radius); color: var(--text);
  font-size: 13.5px; font-family: var(--font); outline: none;
  transition: all var(--transition);
}
.settings-row select:focus,
.settings-row input:focus,
.settings-row textarea:focus {
  border-color: var(--border-input-focus);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.settings-row select {
  cursor: pointer; appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M3 5l3 3 3-3' stroke='%2371717a' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 12px center;
  padding-right: 32px;
}
.api-key-wrapper { display: flex; align-items: center; gap: 4px; }
.api-key-wrapper input { flex: 1; }

/* ════════════════════════════════════════
   Responsive
   ════════════════════════════════════════ */
@media (max-width: 1024px) {
  :root { --sidebar-w: 260px; }
  .messages { padding: 0 24px; }
  .input-area { padding: 0 24px 20px; }
}

@media (max-width: 768px) {
  :root { --topbar-h: 48px; }
  .sidebar {
    position: fixed; top: 0; left: 0; bottom: 0;
    transform: translateX(-100%);
    box-shadow: var(--shadow-lg); width: 280px; min-width: unset;
  }
  .sidebar.open { transform: translateX(0); }
  .welcome-screen h1 { font-size: 22px; }
  .suggestion-grid { grid-template-columns: 1fr; max-width: 100%; }
  .suggestion-card { padding: 12px 14px; }
  .messages { padding: 0 14px; }
  .input-area { padding: 0 14px 16px; }
  .modal { border-radius: var(--radius-lg) var(--radius-lg) 0 0; align-self: flex-end; max-height: 90vh; }
  .modal-overlay { align-items: flex-end; padding: 0; }
  .message.user .message-content { max-width: 85%; }
}

@media (max-width: 480px) {
  .welcome-screen { padding: 30px 16px; }
  .welcome-screen h1 { font-size: 20px; }
  .welcome-logo { margin-bottom: 14px; }
  .message { padding: 12px 0; gap: 10px; }
  .message-avatar { width: 26px; height: 26px; min-width: 26px; font-size: 11px; }
  .message-content { font-size: 14.5px; }
  .typing-avatar { width: 26px; height: 26px; min-width: 26px; font-size: 11px; }
}

/* ── Model badge provider icon ── */
.provider-icon-sm {
  width: 16px;
  height: 16px;
  object-fit: contain;
  vertical-align: middle;
  margin-right: 4px;
  opacity: 0.85;
}