frontend/src/index.css

@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

@tailwind base;
@tailwind components;
@tailwind utilities;

/* KaTeX styles */
@import 'katex/dist/katex.min.css';

/* =========================================
   DESIGN SYSTEM & TOKENS
   ========================================= */
:root {
  /* --- LIGHT THEME (Clean, Airy, Professional) --- */

  /* Brand Colors - Indigo/Violet fused for modern tech feel */
  --brand-primary: #6366f1;
  --brand-primary-rgb: 99, 102, 241;
  /* Indigo 500 */
  --brand-hover: #4f46e5;
  /* Indigo 600 */
  --brand-light: #e0e7ff;
  /* Indigo 100 */
  --brand-text: #ffffff;

  /* Backgrounds */
  --bg-canvas: #ffffff;
  --bg-canvas-rgb: 255, 255, 255;
  --bg-surface: #f8fafc;
  --bg-surface-rgb: 248, 250, 252;
  /* Slate 50 */
  --bg-surface-hover: #eaeff3;
  /* Balanced hover: slightly darker than Slate 100, lighter than Slate 200 */
  --bg-modal: rgba(255, 255, 255, 0.95);

  /* Text */
  --text-primary: #0f172a;
  /* Slate 900 */
  --text-secondary: #64748b;
  /* Slate 500 */
  --text-tertiary: #94a3b8;
  /* Slate 400 */

  /* Borders */
  --border-light: #e2e8f0;
  /* Slate 200 */
  --border-medium: #cbd5e1;
  /* Slate 300 */

  /* Status */
  --status-success: #10b981;
  --status-error: #ef4444;
  --status-warning: #f59e0b;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.15);

  /* Legacy variable mapping for compatibility */
  --bg-primary: var(--bg-canvas);
  --bg-secondary: var(--bg-surface);
  --border-color: var(--border-light);
  --accent: var(--brand-primary);
}

.dark {
  /* --- DARK THEME (Deep, Rich, Premium) --- */

  /* Brand Colors - Slightly desaturated for dark mode legibility */
  --brand-primary: #818cf8;
  --brand-primary-rgb: 129, 140, 248;
  /* Indigo 400 */
  --brand-hover: #6366f1;
  /* Indigo 500 */
  --brand-light: rgba(99, 102, 241, 0.15);
  --brand-text: #ffffff;

  /* Backgrounds - Zinc scale for a rich "Obsidian" feel */
  --bg-canvas: #09090b;
  --bg-canvas-rgb: 9, 9, 11;
  /* Zinc 950 */
  --bg-surface: #18181b;
  --bg-surface-rgb: 24, 24, 27;
  /* Zinc 900 */
  --bg-surface-hover: #27272a;
  /* Zinc 800 */
  --bg-modal: rgba(24, 24, 27, 0.96);
  /* More solid for better text contrast */

  /* Text */
  --text-primary: #f4f4f5;
  /* Zinc 100 */
  --text-secondary: #a1a1aa;
  /* Zinc 400 */
  --text-tertiary: #52525b;
  /* Zinc 600 */

  /* Borders */
  --border-light: #27272a;
  /* Zinc 800 */
  --border-medium: #3f3f46;
  /* Zinc 700 */

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.5);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.5), 0 2px 4px -2px rgb(0 0 0 / 0.5);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.5), 0 4px 6px -4px rgb(0 0 0 / 0.5);
  --shadow-glow: 0 0 25px rgba(129, 140, 248, 0.15);

  /* Legacy mapping */
  --bg-primary: var(--bg-canvas);
  --bg-secondary: var(--bg-surface);
  --border-color: var(--border-light);
  --accent: var(--brand-primary);
}

/* =========================================
   GLOBAL RESET & BASE
   ========================================= */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  overflow: hidden;
  /* App-like feel */
  overscroll-behavior: none;
  /* Prevent bounce/rubber-band effect */
}

body {
  font-family: 'Outfit', 'Inter', system-ui, sans-serif;
  /* Outfit for headings, Inter for body */
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  /* Removed transition on color/background to prevent flickering on theme switch */
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Selection Highlight */
::selection {
  background-color: var(--brand-primary);
  color: white;
}

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

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

::-webkit-scrollbar-thumb {
  background: var(--border-light);
  border-radius: 10px;
  transition: background 0.2s;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-tertiary);
}

/* =========================================
   UTILITIES & COMPONENTS
   ========================================= */

@layer utilities {

  /* Modern Glassmorphism */
  .glass {
    background: rgba(255, 255, 255, 0.65);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    border: 1px solid rgba(255, 255, 255, 0.3);
  }

  .dark .glass {
    background: rgba(10, 10, 12, 0.65);
    border: 1px solid rgba(255, 255, 255, 0.08);
  }

  .glass-panel {
    background: var(--bg-modal);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-light);
  }

  /* Text Gradients */
  .text-gradient {
    background: linear-gradient(135deg, var(--brand-primary), #a855f7);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
  }
}

/* Markdown / Message Content Styling */
.message-content {
  line-height: 1.7;
  font-size: 0.95rem;
}

.message-content p {
  margin-bottom: 0.85rem;
}

.message-content p:last-child {
  margin-bottom: 0;
}

.message-content strong {
  font-weight: 600;
  color: var(--text-primary);
}

.message-content a {
  color: var(--brand-primary);
  text-decoration: none;
  border-bottom: 1px dashed var(--brand-primary);
  transition: all 0.2s;
}

.message-content a:hover {
  border-style: solid;
}

/* Code Blocks */
.message-content pre {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: 0.75rem;
  padding: 1.25rem;
  overflow-x: auto;
  margin: 1.25rem 0;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.02);
}

.message-content code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85em;
  padding: 0.2em 0.4em;
  border-radius: 0.25rem;
  background: var(--bg-surface-hover);
  color: var(--brand-primary);
}

.message-content pre code {
  background: transparent;
  padding: 0;
  color: inherit;
  font-size: 0.9em;
}

/* Lists */
.message-content ul,
.message-content ol {
  padding-left: 1.5rem;
  margin: 0.75rem 0;
}

.message-content li {
  margin: 0.4rem 0;
  padding-left: 0.5rem;
}

/* KaTeX Override (Math) - Minimalist Integrated Look */
.katex-display {
  margin: 1.5rem 0;
  padding: 0.5rem 0;
  background: transparent;
  border: none;
  border-radius: 0;
  overflow-x: auto;
  box-shadow: none;
  position: relative;
  transition: color 0.3s ease;
}

.katex-display:hover {
  border-color: transparent;
  box-shadow: none;
}

.katex {
  font-size: 1.1em;
  color: var(--text-primary);
}

.katex-error {
  color: var(--status-error);
  background: rgba(239, 68, 68, 0.1);
  padding: 2px 6px;
  border-radius: 4px;
}

/* =========================================
   ANIMATIONS
   ========================================= */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(5px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes popIn {
  0% {
    transform: scale(0.9);
    opacity: 0;
  }

  100% {
    transform: scale(1);
    opacity: 1;
  }
}

@keyframes messageSlideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-msg-slide-up {
  animation: messageSlideUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) both;
}

/* Agent Tracking UI Refinements */
.agent-status-badge {
  display: inline-flex;
  align-items: center;
  background: var(--brand-light);
  color: var(--brand-primary);
  padding: 0.35rem 0.85rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  border: 1px solid rgba(var(--brand-primary-rgb), 0.2);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  box-shadow: 0 4px 10px rgba(99, 102, 241, 0.1);
  position: relative;
  overflow: hidden;
}

.agent-status-badge::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 50%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
  animation: badgeShine 2s infinite;
}

@keyframes badgeShine {
  0% {
    left: -100%;
  }

  100% {
    left: 200%;
  }
}

.agent-steps {
  margin-bottom: 1.25rem;
  font-size: 0.85rem;
  border: 1px solid var(--border-light);
  border-radius: 0.75rem;
  overflow: hidden;
  background: var(--bg-surface);
  box-shadow: var(--shadow-sm);
}

.agent-steps summary {
  padding: 0.75rem 1rem;
  cursor: pointer;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s;
  background: var(--bg-secondary);
}

.agent-steps summary:hover {
  color: var(--brand-primary);
}

.steps-list {
  padding: 0.75rem;
  gap: 0.75rem;
}

.step-item {
  background: var(--bg-canvas);
  border: 1px solid var(--border-light);
  border-radius: 0.5rem;
  padding: 0.75rem;
}

.step-tool {
  color: var(--brand-primary);
}