/* Color System */
:root {
  /* Primary Palette - Neutral Grayscale */
  --primary-50: #f9fafb;
  --primary-100: #f3f4f6;
  --primary-200: #e5e7eb;
  --primary-300: #d1d5db;
  --primary-400: #9ca3af;
  --primary-500: #6b7280;
  --primary-600: #4b5563;
  --primary-700: #374151;
  --primary-800: #1f2937;
  --primary-900: #111827;
  --primary-950: #0a0c14;

  /* Neutral Palette */
  --neutral-50: #f9fafb;
  --neutral-100: #f3f4f6;
  --neutral-200: #e5e7eb;
  --neutral-300: #d1d5db;
  --neutral-400: #9ca3af;
  --neutral-500: #6b7280;
  --neutral-600: #4b5563;
  --neutral-700: #374151;
  --neutral-800: #1f2937;
  --neutral-900: #111827;
  --neutral-950: #0a0c14;

  /* Success Colors */
  --success-50: #ecfdf5;
  --success-100: #d1fae5;
  --success-500: #10b981;
  --success-700: #047857;

  /* Warning Colors */
  --warning-50: #fffbeb;
  --warning-100: #fef3c7;
  --warning-500: #f59e0b;
  --warning-700: #b45309;

  /* Error Colors */
  --error-50: #fef2f2;
  --error-100: #fee2e2;
  --error-500: #ef4444;
  --error-700: #b91c1c;

  /* Light Theme Variables */
  --bg-color: #FAF8F0;
  --elevated-bg: white;
  --text-color: var(--neutral-900);
  --text-secondary: var(--neutral-600);

  --taskbar-bg: rgba(255, 255, 255, 0.9);
  --window-bg: rgba(255, 255, 255, 0.95);
  --border-color: #EAE0C8;
  --divider-color: var(--neutral-100);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.07);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.12), 0 2px 4px -1px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.12), 0 4px 6px -2px rgba(0, 0, 0, 0.07);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.12), 0 10px 10px -5px rgba(0, 0, 0, 0.06);

  --accent-color: var(--neutral-700);
  --accent-hover: var(--neutral-800);
  --accent-muted: var(--neutral-100);

  --icon-color: var(--neutral-500);
  --icon-hover: var(--neutral-700);

  --input-bg: white;
  --input-border: var(--neutral-300);
  --input-focus-border: var(--neutral-400);
  --input-focus-ring: var(--neutral-100);

  --message-user-bg: #1f2937;
  --message-user-text: #ffffff;
  --message-bot-bg: #F5F3EB;
  --message-bot-text: var(--neutral-900);

  --button-primary-bg: #1a1a1a;
  --button-primary-text: white;
  --button-secondary-bg: #EFEBE0;
  --button-secondary-text: var(--neutral-800);

  --card-bg: white;
  --code-bg: #F5F3EB;
  --code-text: var(--neutral-900);
  --code-border: #EAE0C8;
}

/* Dark Theme Variables */
.dark-mode {
  --bg-color: #1a1a1a;
  --elevated-bg: #242424;
  --text-color: var(--neutral-100);
  --text-secondary: var(--neutral-400);

  --taskbar-bg: rgba(26, 26, 26, 0.9);
  --window-bg: rgba(26, 26, 26, 0.95);
  --border-color: #3a3a3a;
  --divider-color: #3a3a3a;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.24);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 10px 10px -5px rgba(0, 0, 0, 0.2);

  --accent-color: var(--neutral-300);
  --accent-hover: var(--neutral-200);
  --accent-muted: rgba(156, 163, 175, 0.2);

  --icon-color: var(--neutral-400);
  --icon-hover: var(--neutral-200);

  --input-bg: #242424;
  --input-border: #3a3a3a;
  --input-focus-border: var(--neutral-500);
  --input-focus-ring: rgba(156, 163, 175, 0.25);

  /* Component-specific colors for dark mode */
  --message-user-bg: #e5e7eb;
  --message-user-text: #1f2937;
  --message-bot-bg: #2e2e2e;
  --message-bot-text: var(--neutral-100);

  --button-primary-bg: #ffffff;
  --button-primary-text: #1a1a1a;
  --button-secondary-bg: #3a3a3a;
  --button-secondary-text: var(--neutral-200);

  --card-bg: #242424;

  /* Code & Syntax Highlighting Dark Mode */
  --code-bg: #2e2e2e;
  --code-text: var(--neutral-100);
  --code-border: #3a3a3a;
}

/* Typography System */
:root {
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --font-welcome: Georgia, serif;

  /* Font sizes using fluid typography */
  --text-xs: clamp(0.75rem, 0.7vw, 0.85rem);
  --text-sm: clamp(0.875rem, 0.8vw, 0.95rem);
  --text-base: clamp(1rem, 0.9vw, 1.1rem);
  --text-lg: clamp(1.125rem, 1.1vw, 1.25rem);
  --text-xl: clamp(1.25rem, 1.3vw, 1.5rem);
  --text-2xl: clamp(1.5rem, 1.6vw, 1.875rem);
  --text-3xl: clamp(1.875rem, 2vw, 2.25rem);

  /* Line heights */
  --leading-none: 1;
  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  --leading-loose: 2;

  /* Letter spacing */
  --tracking-tighter: -0.05em;
  --tracking-tight: -0.025em;
  --tracking-normal: 0em;
  --tracking-wide: 0.025em;
  --tracking-wider: 0.05em;
  --tracking-widest: 0.1em;

  /* Font weights */
  --font-thin: 100;
  --font-extralight: 200;
  --font-light: 300;
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  --font-extrabold: 800;
  --font-black: 900;
}

/* Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  /* Remove blue tap highlight on mobile */
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  user-select: none;
}

/* Allow text selection for content areas */
p, span, div, pre, code, textarea, input[type="text"], input[type="email"], input[type="password"] {
  -webkit-user-select: text;
  user-select: text;
}

/* Remove focus outline for interactive elements (mobile PWA) */
button, a, [role="button"], input, select, textarea, [tabindex] {
  outline: none;
  -webkit-tap-highlight-color: transparent;
}

/* Optional: Add custom focus styles for accessibility */
button:focus-visible, a:focus-visible, [role="button"]:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

html {
  font-family: var(--font-sans);
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: 100;
  line-height: var(--leading-normal);
  color: var(--text-color);
  background-color: var(--bg-color);
  height: 100vh;
  overflow: hidden;
  position: relative;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* App Container */
/* ★★★ THIS IS THE KEY FIX ★★★ */
/* Changed from a centering grid to a top-aligned flex layout */
.app-container {
  width: 100%;
  height: 100vh;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* Animation System */
@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes slideInUp {
  from {
    transform: translateY(10px);
    opacity: 0;
  }

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

@keyframes slideInRight {
  from {
    transform: translateX(10px);
    opacity: 0;
  }

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

@keyframes pulse {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.7;
  }
}

@keyframes bounceIn {
  0% {
    transform: scale(0.8);
    opacity: 0;
  }

  80% {
    transform: scale(1.05);
  }

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

@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }

  100% {
    background-position: 200% 0;
  }
}

/* Common Component Styles */

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 0.5rem;
  font-weight: var(--font-medium);
  font-size: var(--text-sm);
  padding: 0.5rem 1rem;
  transition: all 0.2s ease;
  cursor: pointer;
  border: none;
  gap: 0.5rem;
}

.btn-primary {
  background-color: var(--button-primary-bg);
  color: var(--button-primary-text);
}

.btn-primary:hover {
  background-color: #2e2e2e;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.dark-mode .btn-primary:hover {
  background-color: #f5f5f5;
}

.btn-secondary {
  background-color: var(--button-secondary-bg);
  color: var(--button-secondary-text);
}

.btn-secondary:hover {
  background-color: var(--neutral-300);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.dark-mode .btn-secondary:hover {
  background-color: var(--neutral-600);
}

.btn-icon {
  padding: 0.5rem;
  border-radius: 0.5rem;
}

.btn:active,
.btn-icon:active,
.icon-btn:active {
  transform: translateY(0);
}

.btn:focus,
.btn-icon:focus,
.icon-btn:focus {
  outline: 2px solid var(--accent-muted);
  outline-offset: 2px;
}

/* Icons */
.icon-btn {
  background: none;
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--icon-color);
  border-radius: 0.375rem;
  padding: 0.5rem;
  transition: all 0.2s ease;
}

.icon-btn:hover {
  color: var(--icon-hover);
  background-color: var(--neutral-100);
  transform: translateY(-1px);
}

.dark-mode .icon-btn:hover {
  background-color: var(--neutral-800);
}

/* Cards */
.card {
  background-color: var(--card-bg);
  border-radius: 0.75rem;
  border: 1px solid var(--border-color);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

/* Inputs */
.input {
  width: 100%;
  padding: 0.75rem;
  background-color: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: 0.5rem;
  font-size: var(--text-sm);
  color: var(--text-color);
  transition: all 0.2s ease;
  font-family: var(--font-sans);
}

.input:focus {
  outline: none;
  border-color: var(--input-focus-border);
  box-shadow: 0 0 0 3px var(--input-focus-ring);
}

.input::placeholder {
  color: var(--text-secondary);
  opacity: 0.7;
}

textarea.input {
  min-height: 6rem;
  resize: vertical;
  line-height: var(--leading-normal);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.25rem 0.5rem;
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  border-radius: 9999px;
  white-space: nowrap;
}

.badge-primary {
  background-color: var(--accent-muted);
  color: var(--accent-color);
}

.badge-success {
  background-color: var(--success-50);
  color: var(--success-700);
}

.badge-warning {
  background-color: var(--warning-50);
  color: var(--warning-700);
}

.badge-error {
  background-color: var(--error-50);
  color: var(--error-700);
}

/* Loading States */
.loading-shimmer {
  background: linear-gradient(90deg,
      var(--card-bg) 0%,
      var(--input-border) 50%,
      var(--card-bg) 100%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}

/* Tooltips */
.tooltip {
  position: relative;
}

.tooltip::before {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 125%;
  left: 50%;
  transform: translateX(-50%);
  width: max-content;
  max-width: 200px;
  padding: 0.5rem 0.75rem;
  border-radius: 0.25rem;
  background-color: var(--elevated-bg);
  color: var(--text-color);
  font-size: var(--text-xs);
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s ease;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
  pointer-events: none;
  z-index: 100;
}

.tooltip::after {
  content: "";
  position: absolute;
  bottom: calc(125% - 5px);
  left: 50%;
  transform: translateX(-50%) rotate(45deg);
  width: 10px;
  height: 10px;
  background-color: var(--elevated-bg);
  border-right: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s ease;
  pointer-events: none;
  z-index: 99;
}

.tooltip:hover::before,
.tooltip:hover::after {
  opacity: 1;
  visibility: visible;
}

/* Scrollbar Styles */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--neutral-300);
  border-radius: 4px;
}

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

.dark-mode ::-webkit-scrollbar-thumb {
  background: var(--neutral-700);
}

.dark-mode ::-webkit-scrollbar-thumb:hover {
  background: var(--neutral-600);
}

/* Focus Styles */
:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

/* Media Queries for Responsive Design */
@media (max-width: 768px) {
  :root {
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
  }

  .tooltip::before {
    max-width: 160px;
  }
}

/* Utility Classes */
.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.items-center {
  align-items: center;
}

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}

.gap-1 {
  gap: 0.25rem;
}

.gap-2 {
  gap: 0.5rem;
}

.gap-3 {
  gap: 0.75rem;
}

.gap-4 {
  gap: 1rem;
}

.p-1 {
  padding: 0.25rem;
}

.p-2 {
  padding: 0.5rem;
}

.p-3 {
  padding: 0.75rem;
}

.p-4 {
  padding: 1rem;
}

.m-1 {
  margin: 0.25rem;
}

.m-2 {
  margin: 0.5rem;
}

.m-3 {
  margin: 0.75rem;
}

.m-4 {
  margin: 1rem;
}

.rounded-md {
  border-radius: 0.375rem;
}

.rounded-lg {
  border-radius: 0.5rem;
}

.rounded-xl {
  border-radius: 0.75rem;
}

.rounded-full {
  border-radius: 9999px;
}

.text-center {
  text-align: center;
}

.hidden {
  display: none !important;
}

.opacity-50 {
  opacity: 0.5;
}

.font-medium {
  font-weight: var(--font-medium);
}

.font-semibold {
  font-weight: var(--font-semibold);
}

.font-bold {
  font-weight: var(--font-bold);
}

.overflow-hidden {
  overflow: hidden;
}

.overflow-auto {
  overflow: auto;
}

.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.relative {
  position: relative;
}

.absolute {
  position: absolute;
}

.w-full {
  width: 100%;
}

.h-full {
  height: 100%;
}

.inset-0 {
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
}


/* --- Button Variants --- */
/* ... Existing styles remain unchanged ... */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 0.5rem;
  font-weight: var(--font-medium);
  font-size: var(--text-sm);
  padding: 0.5rem 1rem;
  transition: all 0.2s ease;
  cursor: pointer;
  border: none;
  gap: 0.5rem;
}

.btn-primary {
  background-color: var(--button-primary-bg);
  color: var(--button-primary-text);
}

.btn-primary:hover {
  background-color: #2e2e2e;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.dark-mode .btn-primary:hover {
  background-color: #f5f5f5;
}

.btn-secondary {
  background-color: var(--button-secondary-bg);
  color: var(--button-secondary-text);
}

.btn-secondary:hover {
  background-color: var(--neutral-300);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.dark-mode .btn-secondary:hover {
  background-color: var(--neutral-600);
}

/* ✅ New Danger Variant */
.btn-danger {
  background-color: var(--error-500);
  color: white;
}

.btn-danger:hover {
  background-color: var(--error-700);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}