/* ============================================================
   CSS Variables - Design Tokens
   ============================================================ */
:root {
  /* Primary colors - Teal */
  --color-primary: #0d9488;
  --color-primary-light: #5eead4;
  --color-primary-bg: #f0fdfa;

  /* Accent colors - Violet */
  --color-accent: #8b5cf6;
  --color-accent-light: #c4b5fd;
  --color-accent-bg: #f5f3ff;

  /* Semantic colors */
  --color-success: #10b981;
  --color-success-bg: #ecfdf5;
  --color-error: #ef4444;
  --color-error-bg: #fef2f2;
  --color-warning: #f59e0b;

  /* Gray scale */
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2937;
  --color-gray-900: #111827;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.07);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.08);

  /* Border radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
}

/* ============================================================
   Base Styles
   ============================================================ */
html, body {
  height: 100%;
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--color-gray-300);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-gray-400);
}

/* ============================================================
   Message Styles
   ============================================================ */
#chat {
  display: flex;
  flex-direction: column;
}

.msg-user {
  background: linear-gradient(135deg, var(--color-primary-bg) 0%, #e0f7f5 100%);
  border: 1px solid #ccfbf1;
  width: fit-content;
  max-width: 85%;
  align-self: flex-end;
}

.msg-assistant {
  background: var(--color-gray-50);
  border: 1px solid var(--color-gray-100);
}

/* ============================================================
   Tool Card Styles
   ============================================================ */
.tool-card {
  background: linear-gradient(135deg, var(--color-accent-bg) 0%, #ede9fe 100%);
  border: 1px solid #ddd6fe;
  border-left: 3px solid var(--color-accent);
}

.tool-status-running {
  color: var(--color-warning);
}

.tool-status-done {
  color: var(--color-success);
}

.tool-status-error {
  color: var(--color-error);
}

/* ============================================================
   Option Button Styles
   ============================================================ */
.option-btn {
  transition: all 0.2s ease;
  border: 1px solid var(--color-gray-200);
  background: white;
}

.option-btn:hover {
  border-color: var(--color-primary-light);
  background: var(--color-primary-bg);
  transform: translateX(2px);
}

.option-btn.selected {
  background: linear-gradient(135deg, var(--color-primary) 0%, #14b8a6 100%);
  border-color: var(--color-primary);
  color: white;
}

.option-btn.selected-multi {
  background: linear-gradient(135deg, var(--color-success) 0%, #34d399 100%);
  border-color: var(--color-success);
  color: white;
}

/* ============================================================
   Markdown Content Styles
   ============================================================ */
.markdown-content {
  line-height: 1.6;
}

.markdown-content h1 {
  font-size: 1.125rem;
  font-weight: 600;
  margin: 0.5rem 0;
  color: var(--color-gray-800);
}

.markdown-content h2 {
  font-size: 1rem;
  font-weight: 600;
  margin: 0.5rem 0;
  color: var(--color-gray-800);
}

.markdown-content h3 {
  font-size: 0.925rem;
  font-weight: 600;
  margin: 0.5rem 0;
  color: var(--color-gray-700);
}

.markdown-content p {
  margin: 0.375rem 0;
  color: var(--color-gray-700);
}

.markdown-content ul,
.markdown-content ol {
  margin: 0.375rem 0;
  padding-left: 1.25rem;
}

.markdown-content li {
  margin: 0.125rem 0;
  color: var(--color-gray-700);
}

.markdown-content code {
  background: var(--color-gray-100);
  padding: 0.125rem 0.375rem;
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
  color: var(--color-accent);
}

.markdown-content pre {
  background: var(--color-gray-800);
  color: #e5e7eb;
  padding: 0.75rem;
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: 0.5rem 0;
  font-size: 0.8125rem;
}

.markdown-content pre code {
  background: transparent;
  padding: 0;
  color: inherit;
}

.markdown-content a {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}

.markdown-content a:hover {
  border-bottom-color: var(--color-primary);
}

.markdown-content blockquote {
  border-left: 3px solid var(--color-gray-300);
  padding-left: 0.75rem;
  color: var(--color-gray-500);
  margin: 0.5rem 0;
  font-style: italic;
}

/* ============================================================
   Collapsible Styles
   ============================================================ */
.collapsible {
  background: white;
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.collapsible summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  font-size: 0.75rem;
  color: var(--color-gray-600);
  transition: background 0.15s;
}

.collapsible summary:hover {
  background: var(--color-gray-50);
}

.collapsible summary::-webkit-details-marker {
  display: none;
}

.collapsible summary::before {
  content: "";
  width: 0;
  height: 0;
  border-left: 5px solid var(--color-gray-400);
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  transition: transform 0.15s ease;
}

.collapsible[open] summary::before {
  transform: rotate(90deg);
}

.collapsible summary .preview {
  flex: 1;
  font-family: 'SF Mono', Monaco, monospace;
  color: var(--color-gray-400);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
}

.collapsible pre {
  margin: 0;
  padding: 0.75rem;
  max-height: 40vh;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 0.6875rem;
  line-height: 1.5;
  background: var(--color-gray-50);
  border-top: 1px solid var(--color-gray-100);
}

/* ============================================================
   Panel Styles
   ============================================================ */
.panel-question {
  background: linear-gradient(135deg, var(--color-primary-bg) 0%, #e0f7f5 100%);
  border: 1px solid #99f6e4;
}

.panel-reference {
  background: linear-gradient(135deg, var(--color-accent-bg) 0%, #ede9fe 100%);
  border: 1px solid #ddd6fe;
}

/* ============================================================
   Button Styles
   ============================================================ */
.btn-primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, #14b8a6 100%);
  color: white;
  border: none;
  transition: all 0.2s;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover:not(:disabled) {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-secondary {
  background: white;
  color: var(--color-gray-700);
  border: 1px solid var(--color-gray-200);
  transition: all 0.2s;
}

.btn-secondary:hover {
  background: var(--color-gray-50);
  border-color: var(--color-gray-300);
}

.btn-accent {
  background: linear-gradient(135deg, var(--color-accent) 0%, #a78bfa 100%);
  color: white;
  border: none;
  transition: all 0.2s;
  box-shadow: var(--shadow-sm);
}

.btn-accent:hover:not(:disabled) {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.btn-accent:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ============================================================
   Input Styles
   ============================================================ */
.input-field {
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  transition: all 0.2s;
  background: white;
}

.input-field:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.1);
}

.input-field-accent:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

/* ============================================================
   Preview Panel
   ============================================================ */
.preview-panel {
  box-shadow: -4px 0 20px rgba(0, 0, 0, 0.1);
}

/* ============================================================
   Animations
   ============================================================ */
@keyframes pulse-soft {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

.animate-pulse-soft {
  animation: pulse-soft 1.5s ease-in-out infinite;
}

@keyframes slide-up {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-slide-up {
  animation: slide-up 0.2s ease-out;
}