/* ==========================================================================
   LY With Laughter Guru - Core Theme & Design Tokens Stylesheet (theme.css)
   Contains: CSS Reset, Variables, Dark/Light Themes, Typography, Utility Classes
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:ital,opsz,wght@0,14..32,100..900;1,14..32,100..900&display=swap');

/* 1. Global Reset & Box Sizing */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  overflow-x: hidden;
  background-color: var(--bg-app);
}

/* 2. CSS Design Tokens & Variables */
:root {
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;

  /* 8px Spacing System Base Scale */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;

  /* Border Radii (20px base) */
  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  /* Light Theme Color Palette */
  --bg-app: #F6F8FA;
  --bg-surface: #FFFFFF;
  --bg-surface-elevated: #F1F4F9;
  --bg-surface-hover: #F8FAFC;
  --bg-muted: #E2E8F0;

  /* Glassmorphism System */
  --glass-bg: rgba(255, 255, 255, 0.72);
  --glass-border: rgba(226, 232, 240, 0.8);
  --glass-backdrop-blur: blur(20px);
  --glass-shadow: 0 20px 40px rgba(0, 0, 0, 0.04);

  /* Primary Brand Accents */
  --brand-primary: #4F46E5;
  --brand-primary-hover: #4338CA;
  --brand-primary-light: rgba(79, 70, 229, 0.08);
  --brand-secondary: #0EA5E9;
  --brand-gradient: linear-gradient(135deg, #4F46E5 0%, #0EA5E9 100%);
  --brand-gradient-hover: linear-gradient(135deg, #4338CA 0%, #0284C7 100%);

  /* Semantic Status Colors */
  --success: #10B981;
  --success-light: rgba(16, 185, 129, 0.1);
  --warning: #F59E0B;
  --warning-light: rgba(245, 158, 11, 0.1);
  --danger: #EF4444;
  --danger-light: rgba(239, 68, 68, 0.1);
  --info: #3B82F6;
  --info-light: rgba(59, 130, 246, 0.1);

  /* Neutral Text Tokens */
  --text-main: #0F172A;
  --text-secondary: #475569;
  --text-muted: #94A3B8;
  --text-inverse: #FFFFFF;

  /* Borders & Dividers */
  --border-color: #E2E8F0;
  --border-focus: #818CF8;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.03);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.05), 0 2px 4px rgba(0, 0, 0, 0.02);
  --shadow-lg: 0 12px 28px rgba(0, 0, 0, 0.08), 0 4px 10px rgba(0, 0, 0, 0.03);

  /* Layout Constants */
  --sidebar-width: 270px;
  --sidebar-collapsed-width: 80px;
  --header-height: 76px;

  /* Transitions */
  --transition-fast: 0.15s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Dark Mode Tokens Override */
[data-theme="dark"] {
  --bg-app: #0B0F19;
  --bg-surface: #131B2E;
  --bg-surface-elevated: #1E293B;
  --bg-surface-hover: #1A243B;
  --bg-muted: #334155;

  --glass-bg: rgba(19, 27, 46, 0.75);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);

  --brand-primary: #6366F1;
  --brand-primary-hover: #818CF8;
  --brand-primary-light: rgba(99, 102, 241, 0.15);
  --brand-gradient: linear-gradient(135deg, #6366F1 0%, #38BDF8 100%);

  --text-main: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --text-inverse: #0F172A;

  --border-color: #1E293B;
  --border-focus: #6366F1;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 28px rgba(0, 0, 0, 0.5);
}

/* 3. Base Typography */
body {
  font-family: var(--font-family);
  color: var(--text-main);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--text-main);
  font-weight: 700;
  letter-spacing: -0.02em;
}

h1 { font-size: 2rem; line-height: 1.25; }
h2 { font-size: 1.5rem; line-height: 1.3; }
h3 { font-size: 1.25rem; line-height: 1.35; }
h4 { font-size: 1.1rem; line-height: 1.4; }
h5 { font-size: 0.95rem; line-height: 1.45; }

.text-xs { font-size: 0.75rem; }
.text-sm { font-size: 0.875rem; }
.text-base { font-size: 1rem; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }
.text-2xl { font-size: 1.5rem; }
.text-3xl { font-size: 1.875rem; }
.text-4xl { font-size: 2.25rem; }

.font-normal { font-weight: 400; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }
.font-extrabold { font-weight: 800; }
.font-mono { font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace; }

.text-left { text-align: left; }
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-uppercase { text-transform: uppercase; }

/* 4. Color Utilities */
.bg-app { background-color: var(--bg-app); }
.bg-surface { background-color: var(--bg-surface); }
.bg-surface-elevated { background-color: var(--bg-surface-elevated); }

.text-main { color: var(--text-main); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }
.text-brand { color: var(--brand-primary); }
.text-white { color: #FFFFFF; }

.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-danger { color: var(--danger); }
.text-info { color: var(--info); }

.bg-success-light { background-color: var(--success-light); }
.bg-warning-light { background-color: var(--warning-light); }
.bg-danger-light { background-color: var(--danger-light); }
.bg-info-light { background-color: var(--info-light); }
.bg-brand-light { background-color: var(--brand-primary-light); }

.gradient-text {
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* 5. 8px Spacing Utility Scale */
.m-0 { margin: 0; }
.mx-auto { margin-left: auto; margin-right: auto; }
.mt-1 { margin-top: var(--space-1); }
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }

.mb-1 { margin-bottom: var(--space-1); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

.p-0 { padding: 0; }
.p-1 { padding: var(--space-1); }
.p-2 { padding: var(--space-2); }
.p-3 { padding: var(--space-3); }
.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }
.pb-4 { padding-bottom: var(--space-4); }
.pt-3 { padding-top: var(--space-3); }
.pt-4 { padding-top: var(--space-4); }

.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* 6. Display, Flex, & Grid Utilities */
.d-flex { display: flex; }
.flex-column { flex-direction: column; }
.align-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.flex-wrap { flex-wrap: wrap; }
.flex-1 { flex: 1; }
.w-full { width: 100%; }

.d-grid { display: grid; }
.grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 1024px) {
  .grid-cols-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-cols-3 { grid-template-columns: repeat(1, 1fr); }
  [style*="grid-column: span"] {
    grid-column: span 1 !important;
  }
}

@media (max-width: 640px) {
  .grid-cols-2 { grid-template-columns: repeat(1, 1fr); }
  .grid-cols-4 { grid-template-columns: repeat(1, 1fr); }
}

/* 7. Badges, Status Chips, & Breadcrumbs */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.badge-success { background-color: var(--success-light); color: var(--success); }
.badge-warning { background-color: var(--warning-light); color: var(--warning); }
.badge-danger { background-color: var(--danger-light); color: var(--danger); }
.badge-info { background-color: var(--info-light); color: var(--info); }
.badge-brand { background-color: var(--brand-primary-light); color: var(--brand-primary); }
.badge-secondary { background-color: var(--bg-surface-elevated); color: var(--text-secondary); }

.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: currentColor;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.breadcrumb-item a {
  color: var(--text-secondary);
  text-decoration: none;
}

.breadcrumb-item a:hover {
  color: var(--brand-primary);
}

/* 8. Animations & Shimmers */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: fadeIn 0.35s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes pulseGlow {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(1.1); }
}

.pulse-dot {
  animation: pulseGlow 2s infinite ease-in-out;
}

.skeleton {
  background: linear-gradient(90deg, var(--bg-surface-elevated) 25%, var(--bg-surface-hover) 50%, var(--bg-surface-elevated) 75%);
  background-size: 200% 100%;
  animation: skeletonShimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}

@keyframes skeletonShimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* 9. Theme Switcher Button */
.theme-toggle-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-surface-elevated);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  background-color: var(--bg-surface-hover);
  color: var(--brand-primary);
}

[data-theme="dark"] .theme-icon-sun { display: block; }
[data-theme="dark"] .theme-icon-moon { display: none; }
[data-theme="light"] .theme-icon-sun { display: none; }
[data-theme="light"] .theme-icon-moon { display: block; }