/**
 * HomeBuddies Unified Design System v1.0
 * A comprehensive design system that standardizes all UI components,
 * typography, colors, and spacing across the HomeBuddies platform.
 * 
 * This system consolidates multiple CSS frameworks into a single, cohesive design language
 * to achieve 90%+ design consistency score.
 */

/* ---------------------------------------------------------------------
 * TABLE OF CONTENTS:
 * 
 * 1. CSS Reset & Base Styles
 * 2. Core Design Tokens
 *    2.1 Colors
 *    2.2 Typography
 *    2.3 Spacing
 *    2.4 Borders & Radii
 *    2.5 Shadows
 *    2.6 Transitions & Animations
 *    2.7 Breakpoints
 * 3. Utility Classes
 * 4. Layout Components
 * 5. UI Components
 *    5.1 Buttons
 *    5.2 Cards
 *    5.3 Forms
 *    5.4 Navigation
 *    5.5 Modals & Dialogs
 *    5.6 Alerts & Notifications
 *    5.7 Badges & Tags
 *    5.8 Progress Indicators
 * 6. Themed Components
 *    6.1 Premium Theme
 *    6.2 Light/Dark Modes
 * 7. Special Components
 *    7.1 Mascots (Professor Missy)
 *    7.2 Community Features
 * 8. Accessibility Enhancements
 * 9. Responsive Behavior
 * 10. Print Styles
 * --------------------------------------------------------------------- */

/* ---------------------------------------------------------------------
 * 1. CSS Reset & Base Styles
 * --------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background: var(--color-bg-primary);
  min-height: 100vh;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

/* ---------------------------------------------------------------------
 * 2. Core Design Tokens
 * --------------------------------------------------------------------- */

:root {
  /* 2.1 Colors */
  
  /* Primary Colors */
  --color-primary: #4F46E5;
  --color-primary-rgb: 79, 70, 229;
  --color-primary-light: #818CF8;
  --color-primary-dark: #3730A3;
  
  /* Secondary Colors */
  --color-secondary: #10B981;
  --color-secondary-rgb: 16, 185, 129;
  --color-secondary-light: #34D399;
  --color-secondary-dark: #059669;
  
  /* Accent Colors */
  --color-accent: #F59E0B;
  --color-accent-rgb: 245, 158, 11;
  --color-accent-light: #FBBF24;
  --color-accent-dark: #D97706;
  
  /* Status Colors */
  --color-success: #10B981;
  --color-success-rgb: 16, 185, 129;
  --color-warning: #F59E0B;
  --color-warning-rgb: 245, 158, 11;
  --color-error: #EF4444;
  --color-error-rgb: 239, 68, 68;
  --color-info: #3B82F6;
  --color-info-rgb: 59, 130, 246;
  
  /* Neutral Colors */
  --color-white: #FFFFFF;
  --color-black: #000000;
  --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;
  
  /* Background Colors */
  --color-bg-primary: var(--color-white);
  --color-bg-secondary: var(--color-gray-50);
  --color-bg-tertiary: var(--color-gray-100);
  --color-bg-accent: #F0F4FF;
  
  /* Text Colors */
  --color-text-primary: var(--color-gray-900);
  --color-text-secondary: var(--color-gray-600);
  --color-text-tertiary: var(--color-gray-500);
  --color-text-on-dark: var(--color-white);
  
  /* Border Colors */
  --color-border-light: var(--color-gray-200);
  --color-border-medium: var(--color-gray-300);
  --color-border-dark: var(--color-gray-400);
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  --gradient-secondary: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-secondary-light) 100%);
  --gradient-accent: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
  
  /* 2.2 Typography */
  
  /* Font Families */
  --font-family-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  --font-family-display: 'Montserrat', 'Inter', sans-serif;
  --font-family-mono: 'SF Mono', 'Roboto Mono', 'Consolas', 'Monaco', monospace;
  
  /* Font Sizes */
  --font-size-xs: 0.75rem;   /* 12px */
  --font-size-sm: 0.875rem;  /* 14px */
  --font-size-base: 1rem;    /* 16px */
  --font-size-lg: 1.125rem;  /* 18px */
  --font-size-xl: 1.25rem;   /* 20px */
  --font-size-2xl: 1.5rem;   /* 24px */
  --font-size-3xl: 1.875rem; /* 30px */
  --font-size-4xl: 2.25rem;  /* 36px */
  --font-size-5xl: 3rem;     /* 48px */
  
  /* Font Weights */
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;
  
  /* Line Heights */
  --line-height-tight: 1.25;
  --line-height-snug: 1.375;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  --line-height-loose: 2;
  
  /* Letter Spacing */
  --letter-spacing-tight: -0.025em;
  --letter-spacing-normal: 0em;
  --letter-spacing-wide: 0.025em;
  
  /* 2.3 Spacing */
  --spacing-0: 0;
  --spacing-1: 0.25rem;  /* 4px */
  --spacing-2: 0.5rem;   /* 8px */
  --spacing-3: 0.75rem;  /* 12px */
  --spacing-4: 1rem;     /* 16px */
  --spacing-5: 1.25rem;  /* 20px */
  --spacing-6: 1.5rem;   /* 24px */
  --spacing-8: 2rem;     /* 32px */
  --spacing-10: 2.5rem;  /* 40px */
  --spacing-12: 3rem;    /* 48px */
  --spacing-16: 4rem;    /* 64px */
  --spacing-20: 5rem;    /* 80px */
  --spacing-24: 6rem;    /* 96px */
  
  /* 2.4 Borders & Radii */
  --radius-sm: 0.25rem;   /* 4px */
  --radius-md: 0.5rem;    /* 8px */
  --radius-lg: 0.75rem;   /* 12px */
  --radius-xl: 1rem;      /* 16px */
  --radius-2xl: 1.5rem;   /* 24px */
  --radius-full: 9999px;
  --radius-card: var(--radius-lg);
  --radius-button: var(--radius-md);
  --radius-input: var(--radius-md);
  
  --border-width-thin: 1px;
  --border-width-medium: 2px;
  --border-width-thick: 3px;
  
  /* 2.5 Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);
  
  /* Glass Effects */
  --glass-bg: rgba(255, 255, 255, 0.8);
  --glass-border: rgba(255, 255, 255, 0.2);
  --glass-blur: blur(10px);
  
  /* 2.6 Transitions & Animations */
  --transition-fast: 150ms;
  --transition-normal: 300ms;
  --transition-slow: 500ms;
  --transition-ease: cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: cubic-bezier(0.175, 0.885, 0.32, 1.275);
  
  --animation-spin: spin 1s linear infinite;
  --animation-ping: ping 1s cubic-bezier(0, 0, 0.2, 1) infinite;
  --animation-pulse: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
  --animation-bounce: bounce 1s infinite;
  
  /* Transform Effects */
  --transform-hover-scale: scale(1.03);
  --transform-hover-lift: translateY(-2px);
  
  /* 2.7 Breakpoints */
  --breakpoint-xs: 0;
  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;
  --breakpoint-2xl: 1536px;
  
  /* Layout Constants */
  --header-height: 64px;
  --sidebar-width: 280px;
  --content-max-width: 1200px;
  --content-padding: var(--spacing-4);
  
  /* Z-index Layers */
  --z-index-dropdown: 100;
  --z-index-sticky: 200;
  --z-index-fixed: 300;
  --z-index-modal-backdrop: 400;
  --z-index-modal: 500;
  --z-index-popover: 600;
  --z-index-tooltip: 700;
  --z-index-toast: 800;
}

/* ---------------------------------------------------------------------
 * 3. Utility Classes
 * --------------------------------------------------------------------- */

/* Display */
.block { display: block; }
.inline-block { display: inline-block; }
.inline { display: inline; }
.flex { display: flex; }
.inline-flex { display: inline-flex; }
.grid { display: grid; }
.hidden { display: none; }

/* Flex & Grid */
.flex-row { flex-direction: row; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.flex-nowrap { flex-wrap: nowrap; }
.items-start { align-items: flex-start; }
.items-center { align-items: center; }
.items-end { align-items: flex-end; }
.justify-start { justify-content: flex-start; }
.justify-center { justify-content: center; }
.justify-end { justify-content: flex-end; }
.justify-between { justify-content: space-between; }
.justify-around { justify-content: space-around; }
.justify-evenly { justify-content: space-evenly; }
.flex-1 { flex: 1 1 0%; }
.flex-auto { flex: 1 1 auto; }
.flex-initial { flex: 0 1 auto; }
.flex-none { flex: none; }

/* Gap */
.gap-0 { gap: var(--spacing-0); }
.gap-1 { gap: var(--spacing-1); }
.gap-2 { gap: var(--spacing-2); }
.gap-3 { gap: var(--spacing-3); }
.gap-4 { gap: var(--spacing-4); }
.gap-6 { gap: var(--spacing-6); }
.gap-8 { gap: var(--spacing-8); }
.gap-12 { gap: var(--spacing-12); }

/* Padding */
.p-0 { padding: var(--spacing-0); }
.p-1 { padding: var(--spacing-1); }
.p-2 { padding: var(--spacing-2); }
.p-3 { padding: var(--spacing-3); }
.p-4 { padding: var(--spacing-4); }
.p-6 { padding: var(--spacing-6); }
.p-8 { padding: var(--spacing-8); }

.px-0 { padding-left: var(--spacing-0); padding-right: var(--spacing-0); }
.px-1 { padding-left: var(--spacing-1); padding-right: var(--spacing-1); }
.px-2 { padding-left: var(--spacing-2); padding-right: var(--spacing-2); }
.px-3 { padding-left: var(--spacing-3); padding-right: var(--spacing-3); }
.px-4 { padding-left: var(--spacing-4); padding-right: var(--spacing-4); }
.px-6 { padding-left: var(--spacing-6); padding-right: var(--spacing-6); }
.px-8 { padding-left: var(--spacing-8); padding-right: var(--spacing-8); }

.py-0 { padding-top: var(--spacing-0); padding-bottom: var(--spacing-0); }
.py-1 { padding-top: var(--spacing-1); padding-bottom: var(--spacing-1); }
.py-2 { padding-top: var(--spacing-2); padding-bottom: var(--spacing-2); }
.py-3 { padding-top: var(--spacing-3); padding-bottom: var(--spacing-3); }
.py-4 { padding-top: var(--spacing-4); padding-bottom: var(--spacing-4); }
.py-6 { padding-top: var(--spacing-6); padding-bottom: var(--spacing-6); }
.py-8 { padding-top: var(--spacing-8); padding-bottom: var(--spacing-8); }

/* Margin */
.m-0 { margin: var(--spacing-0); }
.m-1 { margin: var(--spacing-1); }
.m-2 { margin: var(--spacing-2); }
.m-3 { margin: var(--spacing-3); }
.m-4 { margin: var(--spacing-4); }
.m-6 { margin: var(--spacing-6); }
.m-8 { margin: var(--spacing-8); }

.mx-0 { margin-left: var(--spacing-0); margin-right: var(--spacing-0); }
.mx-1 { margin-left: var(--spacing-1); margin-right: var(--spacing-1); }
.mx-2 { margin-left: var(--spacing-2); margin-right: var(--spacing-2); }
.mx-3 { margin-left: var(--spacing-3); margin-right: var(--spacing-3); }
.mx-4 { margin-left: var(--spacing-4); margin-right: var(--spacing-4); }
.mx-6 { margin-left: var(--spacing-6); margin-right: var(--spacing-6); }
.mx-8 { margin-left: var(--spacing-8); margin-right: var(--spacing-8); }
.mx-auto { margin-left: auto; margin-right: auto; }

.my-0 { margin-top: var(--spacing-0); margin-bottom: var(--spacing-0); }
.my-1 { margin-top: var(--spacing-1); margin-bottom: var(--spacing-1); }
.my-2 { margin-top: var(--spacing-2); margin-bottom: var(--spacing-2); }
.my-3 { margin-top: var(--spacing-3); margin-bottom: var(--spacing-3); }
.my-4 { margin-top: var(--spacing-4); margin-bottom: var(--spacing-4); }
.my-6 { margin-top: var(--spacing-6); margin-bottom: var(--spacing-6); }
.my-8 { margin-top: var(--spacing-8); margin-bottom: var(--spacing-8); }

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

.mt-1 { margin-top: var(--spacing-1); }
.mt-2 { margin-top: var(--spacing-2); }
.mt-3 { margin-top: var(--spacing-3); }
.mt-4 { margin-top: var(--spacing-4); }
.mt-6 { margin-top: var(--spacing-6); }
.mt-8 { margin-top: var(--spacing-8); }

/* Typography */
.text-xs { font-size: var(--font-size-xs); }
.text-sm { font-size: var(--font-size-sm); }
.text-base { font-size: var(--font-size-base); }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); }
.text-2xl { font-size: var(--font-size-2xl); }
.text-3xl { font-size: var(--font-size-3xl); }
.text-4xl { font-size: var(--font-size-4xl); }
.text-5xl { font-size: var(--font-size-5xl); }

.font-light { font-weight: var(--font-weight-light); }
.font-normal { font-weight: var(--font-weight-normal); }
.font-medium { font-weight: var(--font-weight-medium); }
.font-semibold { font-weight: var(--font-weight-semibold); }
.font-bold { font-weight: var(--font-weight-bold); }
.font-extrabold { font-weight: var(--font-weight-extrabold); }

.text-left { text-align: left; }
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-justify { text-align: justify; }

.leading-tight { line-height: var(--line-height-tight); }
.leading-snug { line-height: var(--line-height-snug); }
.leading-normal { line-height: var(--line-height-normal); }
.leading-relaxed { line-height: var(--line-height-relaxed); }
.leading-loose { line-height: var(--line-height-loose); }

.tracking-tight { letter-spacing: var(--letter-spacing-tight); }
.tracking-normal { letter-spacing: var(--letter-spacing-normal); }
.tracking-wide { letter-spacing: var(--letter-spacing-wide); }

.font-display { font-family: var(--font-family-display); }
.font-mono { font-family: var(--font-family-mono); }

/* Text Colors */
.text-primary { color: var(--color-text-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-tertiary { color: var(--color-text-tertiary); }
.text-white { color: var(--color-white); }
.text-black { color: var(--color-black); }

.text-brand-primary { color: var(--color-primary); }
.text-brand-secondary { color: var(--color-secondary); }
.text-brand-accent { color: var(--color-accent); }

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

/* Background Colors */
.bg-primary { background-color: var(--color-bg-primary); }
.bg-secondary { background-color: var(--color-bg-secondary); }
.bg-tertiary { background-color: var(--color-bg-tertiary); }
.bg-accent { background-color: var(--color-bg-accent); }

.bg-brand-primary { background-color: var(--color-primary); }
.bg-brand-secondary { background-color: var(--color-secondary); }
.bg-brand-accent { background-color: var(--color-accent); }

.bg-success { background-color: var(--color-success); }
.bg-warning { background-color: var(--color-warning); }
.bg-error { background-color: var(--color-error); }
.bg-info { background-color: var(--color-info); }

.bg-transparent { background-color: transparent; }
.bg-white { background-color: var(--color-white); }
.bg-black { background-color: var(--color-black); }

/* Border Radius */
.rounded-none { border-radius: 0; }
.rounded-sm { border-radius: var(--radius-sm); }
.rounded-md { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-2xl { border-radius: var(--radius-2xl); }
.rounded-full { border-radius: var(--radius-full); }

/* Borders */
.border { border-width: var(--border-width-thin); }
.border-medium { border-width: var(--border-width-medium); }
.border-thick { border-width: var(--border-width-thick); }
.border-none { border-style: none; }

.border-light { border-color: var(--color-border-light); }
.border-medium { border-color: var(--color-border-medium); }
.border-dark { border-color: var(--color-border-dark); }

.border-brand-primary { border-color: var(--color-primary); }
.border-brand-secondary { border-color: var(--color-secondary); }
.border-brand-accent { border-color: var(--color-accent); }

/* Shadows */
.shadow-none { box-shadow: none; }
.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }
.shadow-inner { box-shadow: var(--shadow-inner); }

/* Positioning */
.relative { position: relative; }
.absolute { position: absolute; }
.fixed { position: fixed; }
.sticky { position: sticky; }
.static { position: static; }

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

.z-0 { z-index: 0; }
.z-10 { z-index: 10; }
.z-20 { z-index: 20; }
.z-30 { z-index: 30; }
.z-40 { z-index: 40; }
.z-50 { z-index: 50; }
.z-auto { z-index: auto; }

/* Width & Height */
.w-full { width: 100%; }
.w-auto { width: auto; }
.w-screen { width: 100vw; }
.h-full { height: 100%; }
.h-auto { height: auto; }
.h-screen { height: 100vh; }

.min-w-0 { min-width: 0; }
.min-h-0 { min-height: 0; }
.max-w-full { max-width: 100%; }
.max-h-full { max-height: 100%; }

/* Other Utilities */
.overflow-auto { overflow: auto; }
.overflow-hidden { overflow: hidden; }
.overflow-visible { overflow: visible; }
.overflow-scroll { overflow: scroll; }
.overflow-x-auto { overflow-x: auto; }
.overflow-y-auto { overflow-y: auto; }
.overflow-x-hidden { overflow-x: hidden; }
.overflow-y-hidden { overflow-y: hidden; }

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

.whitespace-normal { white-space: normal; }
.whitespace-nowrap { white-space: nowrap; }
.whitespace-pre { white-space: pre; }
.whitespace-pre-line { white-space: pre-line; }
.whitespace-pre-wrap { white-space: pre-wrap; }

.cursor-pointer { cursor: pointer; }
.cursor-default { cursor: default; }
.cursor-not-allowed { cursor: not-allowed; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ---------------------------------------------------------------------
 * 4. Layout Components
 * --------------------------------------------------------------------- */

.container {
  width: 100%;
  max-width: var(--content-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--content-padding);
  padding-right: var(--content-padding);
}

.section {
  padding-top: var(--spacing-12);
  padding-bottom: var(--spacing-12);
}

.grid-cols-1 { display: grid; grid-template-columns: 1fr; gap: var(--spacing-6); }
.grid-cols-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--spacing-6); }
.grid-cols-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--spacing-6); }
.grid-cols-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--spacing-6); }
.grid-cols-5 { display: grid; grid-template-columns: repeat(5, 1fr); gap: var(--spacing-6); }
.grid-cols-6 { display: grid; grid-template-columns: repeat(6, 1fr); gap: var(--spacing-6); }

/* ---------------------------------------------------------------------
 * 5. UI Components
 * --------------------------------------------------------------------- */

/* 5.1 Buttons */
.btn, 
.button,
button[type="button"],
button[type="submit"],
button[type="reset"],
input[type="button"],
input[type="submit"],
input[type="reset"] {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  line-height: 1.5;
  padding: var(--spacing-2) var(--spacing-4);
  border-radius: var(--radius-button);
  transition: all var(--transition-normal) var(--transition-ease);
  cursor: pointer;
  text-decoration: none;
  border: none;
  white-space: nowrap;
}

.btn:focus, 
.button:focus,
button:focus,
input[type="button"]:focus,
input[type="submit"]:focus,
input[type="reset"]:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.btn:disabled, 
.button:disabled,
button:disabled,
input[type="button"]:disabled,
input[type="submit"]:disabled,
input[type="reset"]:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-primary,
.primary-btn {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.btn-primary:hover,
.primary-btn:hover {
  background-color: var(--color-primary-dark);
  transform: var(--transform-hover-lift);
}

.btn-secondary,
.secondary-btn {
  background-color: var(--color-secondary);
  color: var(--color-white);
}

.btn-secondary:hover,
.secondary-btn:hover {
  background-color: var(--color-secondary-dark);
  transform: var(--transform-hover-lift);
}

.btn-accent,
.accent-btn {
  background-color: var(--color-accent);
  color: var(--color-white);
}

.btn-accent:hover,
.accent-btn:hover {
  background-color: var(--color-accent-dark);
  transform: var(--transform-hover-lift);
}

.btn-outline,
.outline-btn {
  background-color: transparent;
  color: var(--color-primary);
  border: var(--border-width-thin) solid var(--color-primary);
}

.btn-outline:hover,
.outline-btn:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
  transform: var(--transform-hover-lift);
}

.btn-ghost,
.ghost-btn {
  background-color: transparent;
  color: var(--color-text-primary);
}

.btn-ghost:hover,
.ghost-btn:hover {
  background-color: var(--color-bg-tertiary);
  transform: var(--transform-hover-lift);
}

.btn-sm,
.btn-small {
  font-size: var(--font-size-sm);
  padding: var(--spacing-1) var(--spacing-3);
}

.btn-lg,
.btn-large {
  font-size: var(--font-size-lg);
  padding: var(--spacing-3) var(--spacing-6);
}

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}

.btn-icon.btn-sm {
  width: 32px;
  height: 32px;
}

.btn-icon.btn-lg {
  width: 48px;
  height: 48px;
}

.btn-group {
  display: inline-flex;
  border-radius: var(--radius-button);
  overflow: hidden;
}

.btn-group .btn {
  border-radius: 0;
}

.btn-group .btn:first-child {
  border-top-left-radius: var(--radius-button);
  border-bottom-left-radius: var(--radius-button);
}

.btn-group .btn:last-child {
  border-top-right-radius: var(--radius-button);
  border-bottom-right-radius: var(--radius-button);
}

/* 5.2 Cards */
.card {
  background-color: var(--color-bg-primary);
  border-radius: var(--radius-card);
  padding: var(--spacing-6);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal) var(--transition-ease), 
              box-shadow var(--transition-normal) var(--transition-ease);
}

.card:hover {
  transform: var(--transform-hover-lift);
  box-shadow: var(--shadow-lg);
}

.card-header {
  margin-bottom: var(--spacing-4);
}

.card-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-2);
}

.card-subtitle {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
}

.card-body {
  margin-bottom: var(--spacing-4);
}

.card-footer {
  border-top: 1px solid var(--color-border-light);
  padding-top: var(--spacing-4);
  margin-top: var(--spacing-4);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.card-compact {
  padding: var(--spacing-4);
}

.card-glass {
  background-color: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
}

/* 5.3 Forms */
.form-group {
  margin-bottom: var(--spacing-4);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-2);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

.form-control {
  width: 100%;
  padding: var(--spacing-3);
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  border: 1px solid var(--color-border-medium);
  border-radius: var(--radius-input);
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  transition: border-color var(--transition-normal) var(--transition-ease),
              box-shadow var(--transition-normal) var(--transition-ease);
}

.form-control:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(var(--color-primary-rgb), 0.2);
}

.form-control.error {
  border-color: var(--color-error);
}

.form-error {
  color: var(--color-error);
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-1);
}

.form-helper {
  color: var(--color-text-tertiary);
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-1);
}

.form-check {
  display: flex;
  align-items: center;
  margin-bottom: var(--spacing-2);
}

.form-check-input {
  width: 16px;
  height: 16px;
  margin-right: var(--spacing-2);
}

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%236b7280'%3E%3Cpath d='M7 10l5 5 5-5z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  background-size: 20px;
  padding-right: 40px;
}

/* 5.4 Navigation */
.navbar {
  display: flex;
  align-items: center;
  padding: var(--spacing-4);
  background-color: var(--color-bg-primary);
  position: sticky;
  top: 0;
  z-index: var(--z-index-sticky);
  box-shadow: var(--shadow-sm);
}

.navbar-brand {
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-xl);
  text-decoration: none;
  color: var(--color-text-primary);
}

.navbar-nav {
  display: flex;
  list-style: none;
  margin-left: var(--spacing-4);
  gap: var(--spacing-4);
}

.nav-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition-normal) var(--transition-ease);
  padding: var(--spacing-2) 0;
  position: relative;
}

.nav-link:hover {
  color: var(--color-primary);
}

.nav-link.active {
  color: var(--color-primary);
  font-weight: var(--font-weight-medium);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-primary);
}

.navbar-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: var(--spacing-4);
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-text-primary);
}

/* 5.5 Modals & Dialogs */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-index-modal-backdrop);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal) var(--transition-ease);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background-color: var(--color-bg-primary);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 500px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  transform: scale(0.95);
  transition: transform var(--transition-normal) var(--transition-ease);
  z-index: var(--z-index-modal);
}

.modal-overlay.active .modal {
  transform: scale(1);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-4) var(--spacing-6);
  border-bottom: 1px solid var(--color-border-light);
}

.modal-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  margin: 0;
}

.modal-close {
  background: none;
  border: none;
  font-size: var(--font-size-xl);
  cursor: pointer;
  color: var(--color-text-tertiary);
  padding: var(--spacing-1);
  line-height: 1;
  transition: color var(--transition-normal) var(--transition-ease);
}

.modal-close:hover {
  color: var(--color-text-primary);
}

.modal-body {
  padding: var(--spacing-6);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--spacing-3);
  padding: var(--spacing-4) var(--spacing-6);
  border-top: 1px solid var(--color-border-light);
}

/* 5.6 Alerts & Notifications */
.alert {
  padding: var(--spacing-4);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-4);
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-3);
}

.alert-success {
  background-color: rgba(var(--color-success-rgb), 0.1);
  border-left: 4px solid var(--color-success);
  color: var(--color-success);
}

.alert-warning {
  background-color: rgba(var(--color-warning-rgb), 0.1);
  border-left: 4px solid var(--color-warning);
  color: var(--color-warning);
}

.alert-error {
  background-color: rgba(var(--color-error-rgb), 0.1);
  border-left: 4px solid var(--color-error);
  color: var(--color-error);
}

.alert-info {
  background-color: rgba(var(--color-info-rgb), 0.1);
  border-left: 4px solid var(--color-info);
  color: var(--color-info);
}

.alert-icon {
  font-size: var(--font-size-xl);
  flex-shrink: 0;
}

.alert-content {
  flex-grow: 1;
}

.alert-title {
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-1);
}

.alert-message {
  color: inherit;
  opacity: 0.8;
}

.alert-close {
  background: none;
  border: none;
  color: currentColor;
  opacity: 0.6;
  cursor: pointer;
  padding: 0;
  font-size: var(--font-size-xl);
  line-height: 1;
  margin-left: var(--spacing-2);
  transition: opacity var(--transition-normal) var(--transition-ease);
}

.alert-close:hover {
  opacity: 1;
}

.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: var(--z-index-toast);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3);
  width: 320px;
  max-width: calc(100vw - 40px);
}

.toast {
  background-color: var(--color-bg-primary);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-4);
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-3);
  animation: slideIn 0.3s forwards;
}

.toast.hiding {
  animation: slideOut 0.3s forwards;
}

.toast-success {
  border-left-color: var(--color-success);
}

.toast-warning {
  border-left-color: var(--color-warning);
}

.toast-error {
  border-left-color: var(--color-error);
}

.toast-info {
  border-left-color: var(--color-info);
}

.toast-icon {
  font-size: var(--font-size-xl);
}

.toast-content {
  flex-grow: 1;
}

.toast-title {
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-1);
}

.toast-message {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

.toast-close {
  background: none;
  border: none;
  color: var(--color-text-tertiary);
  cursor: pointer;
  padding: 0;
  font-size: var(--font-size-lg);
  line-height: 1;
  transition: color var(--transition-normal) var(--transition-ease);
}

.toast-close:hover {
  color: var(--color-text-primary);
}

@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

@keyframes slideOut {
  from { transform: translateX(0); opacity: 1; }
  to { transform: translateX(100%); opacity: 0; }
}

/* 5.7 Badges & Tags */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-1) var(--spacing-2);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-full);
  line-height: 1;
}

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

.badge-secondary {
  background-color: var(--color-secondary);
  color: var(--color-white);
}

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

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

.badge-warning {
  background-color: var(--color-warning);
  color: var(--color-text-primary);
}

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

.badge-info {
  background-color: var(--color-info);
  color: var(--color-white);
}

.badge-outline {
  background-color: transparent;
  border: 1px solid currentColor;
}

.badge-lg {
  padding: var(--spacing-1) var(--spacing-3);
  font-size: var(--font-size-sm);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-1);
  padding: var(--spacing-1) var(--spacing-2);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-full);
  background-color: var(--color-bg-tertiary);
  color: var(--color-text-secondary);
}

.tag-close {
  background: none;
  border: none;
  color: currentColor;
  cursor: pointer;
  padding: 0;
  font-size: var(--font-size-xs);
  line-height: 1;
  opacity: 0.7;
  transition: opacity var(--transition-normal) var(--transition-ease);
}

.tag-close:hover {
  opacity: 1;
}

/* 5.8 Progress Indicators */
.progress {
  height: 8px;
  background-color: var(--color-bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background-color: var(--color-primary);
  border-radius: var(--radius-full);
  transition: width 0.5s ease;
}

.progress-bar-success {
  background-color: var(--color-success);
}

.progress-bar-warning {
  background-color: var(--color-warning);
}

.progress-bar-error {
  background-color: var(--color-error);
}

.progress-bar-info {
  background-color: var(--color-info);
}

.progress-bar-striped {
  background-image: linear-gradient(
    45deg,
    rgba(255, 255, 255, 0.15) 25%,
    transparent 25%,
    transparent 50%,
    rgba(255, 255, 255, 0.15) 50%,
    rgba(255, 255, 255, 0.15) 75%,
    transparent 75%,
    transparent
  );
  background-size: 1rem 1rem;
}

.progress-bar-animated {
  animation: progress-bar-stripes 1s linear infinite;
}

@keyframes progress-bar-stripes {
  from { background-position: 1rem 0; }
  to { background-position: 0 0; }
}

.spinner {
  display: inline-block;
  width: 24px;
  height: 24px;
  border: 2px solid rgba(var(--color-primary-rgb), 0.3);
  border-radius: 50%;
  border-top-color: var(--color-primary);
  animation: spin 1s ease-in-out infinite;
}

.spinner-sm {
  width: 16px;
  height: 16px;
  border-width: 2px;
}

.spinner-lg {
  width: 32px;
  height: 32px;
  border-width: 3px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ---------------------------------------------------------------------
 * 6. Themed Components
 * --------------------------------------------------------------------- */

/* 6.1 Premium Theme */
.theme-premium {
  /* Override primary colors */
  --color-primary: #5e17eb;
  --color-primary-rgb: 94, 23, 235;
  --color-primary-light: #7c3aff;
  --color-primary-dark: #4c12c0;
  
  /* Override secondary colors */
  --color-secondary: #00e0b8;
  --color-secondary-rgb: 0, 224, 184;
  --color-secondary-light: #3aead0;
  --color-secondary-dark: #00c3a0;
  
  /* Override accent colors */
  --color-accent: #ff5d8f;
  --color-accent-rgb: 255, 93, 143;
  --color-accent-light: #ff85a9;
  --color-accent-dark: #ff346f;
  
  /* Override background colors */
  --color-bg-primary: #0a0d1c;
  --color-bg-secondary: #151930;
  --color-bg-tertiary: #1e2340;
  
  /* Override text colors */
  --color-text-primary: #ffffff;
  --color-text-secondary: rgba(255, 255, 255, 0.92);
  --color-text-tertiary: rgba(255, 255, 255, 0.8);
  
  /* Override typography */
  --font-family-display: 'Montserrat', sans-serif;
  
  /* Override border radius */
  --radius-button: 40px;
  
  /* Override effects */
  --transform-hover-scale: scale(1.05);
  
  /* Premium specific variables */
  --premium-glass-bg: rgba(255, 255, 255, 0.08);
  --premium-glass-border: rgba(255, 255, 255, 0.12);
  --premium-box-shadow: 0 10px 30px rgba(5, 3, 45, 0.7), 0 0 15px rgba(94, 23, 235, 0.2);
}

/* Premium Theme Specific Components */
.premium-btn {
  border-radius: var(--radius-button);
  font-family: var(--font-family-display);
  font-weight: var(--font-weight-semibold);
  padding: 12px 28px;
  font-size: var(--font-size-base);
  border: none;
  cursor: pointer;
  transition: all 300ms cubic-bezier(0.175, 0.885, 0.32, 1.275);
  position: relative;
  overflow: hidden;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.premium-btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: white;
  box-shadow: 0 5px 15px rgba(var(--color-primary-rgb), 0.3);
}

.premium-btn-primary:hover {
  box-shadow: 0 8px 25px rgba(var(--color-primary-rgb), 0.5);
  transform: var(--transform-hover-lift);
}

.premium-btn-primary::after {
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: -100%;
  background: linear-gradient(90deg, 
    rgba(255,255,255,0), 
    rgba(255,255,255,0.2), 
    rgba(255,255,255,0)
  );
  transition: all 0.6s;
}

.premium-btn-primary:hover::after {
  left: 100%;
}

.premium-card {
  background: var(--premium-glass-bg);
  border-radius: var(--radius-card);
  padding: 24px;
  border: 1px solid var(--premium-glass-border);
  transition: all 300ms cubic-bezier(0.175, 0.885, 0.32, 1.275);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.premium-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--premium-box-shadow);
  border-color: var(--color-primary-light);
}

/* 6.2 Light/Dark Modes */
.theme-light {
  /* Light mode already set as default in root variables */
}

.theme-dark {
  --color-bg-primary: #0c0e1e;
  --color-bg-secondary: #191c33;
  --color-bg-tertiary: #222642;
  
  --color-text-primary: #ffffff;
  --color-text-secondary: rgba(255, 255, 255, 0.85);
  --color-text-tertiary: rgba(255, 255, 255, 0.6);
  
  --color-border-light: rgba(255, 255, 255, 0.1);
  --color-border-medium: rgba(255, 255, 255, 0.15);
  --color-border-dark: rgba(255, 255, 255, 0.2);
  
  --glass-bg: rgba(255, 255, 255, 0.07);
  --glass-border: rgba(255, 255, 255, 0.1);
}

/* Auto-detect preferred color scheme */
@media (prefers-color-scheme: dark) {
  :root:not(.theme-light) {
    --color-bg-primary: #0c0e1e;
    --color-bg-secondary: #191c33;
    --color-bg-tertiary: #222642;
    
    --color-text-primary: #ffffff;
    --color-text-secondary: rgba(255, 255, 255, 0.85);
    --color-text-tertiary: rgba(255, 255, 255, 0.6);
    
    --color-border-light: rgba(255, 255, 255, 0.1);
    --color-border-medium: rgba(255, 255, 255, 0.15);
    --color-border-dark: rgba(255, 255, 255, 0.2);
    
    --glass-bg: rgba(255, 255, 255, 0.07);
    --glass-border: rgba(255, 255, 255, 0.1);
  }
}

/* High contrast mode support */
.theme-high-contrast {
  --color-primary: #0066ff;
  --color-primary-rgb: 0, 102, 255;
  --color-primary-light: #4d94ff;
  --color-primary-dark: #0052cc;
  
  --color-secondary: #ff0066;
  --color-secondary-rgb: 255, 0, 102;
  --color-secondary-light: #ff4d94;
  --color-secondary-dark: #cc0052;
  
  --color-bg-primary: #000000;
  --color-bg-secondary: #121212;
  --color-bg-tertiary: #1e1e1e;
  
  --color-text-primary: #ffffff;
  --color-text-secondary: rgba(255, 255, 255, 0.9);
  --color-text-tertiary: rgba(255, 255, 255, 0.8);
  
  --border-width-thin: 2px;
  --border-width-medium: 3px;
  
  --glass-bg: rgba(255, 255, 255, 0.1);
  --glass-border: rgba(255, 255, 255, 0.3);
}

/* ---------------------------------------------------------------------
 * 7. Special Components
 * --------------------------------------------------------------------- */

/* 7.1 Mascots (Professor Missy) */
.mascot-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 100px;
  height: 100px;
  z-index: 900;
  transition: all 0.3s ease;
  cursor: pointer;
}

.mascot-container:hover {
  transform: scale(1.1);
}

.mascot-bubble {
  position: absolute;
  bottom: 100%;
  right: 0;
  background: white;
  color: var(--color-text-primary);
  padding: 12px 16px;
  border-radius: 18px;
  min-width: 200px;
  max-width: 280px;
  font-size: 0.9rem;
  box-shadow: var(--shadow-lg);
  margin-bottom: 10px;
  opacity: 0;
  transition: all 0.3s ease;
  pointer-events: none;
  font-family: var(--font-family-primary);
  font-weight: var(--font-weight-medium);
}

.mascot-bubble::after {
  content: '';
  position: absolute;
  bottom: -8px;
  right: 30px;
  width: 16px;
  height: 16px;
  background: white;
  transform: rotate(45deg);
}

.mascot-container:hover .mascot-bubble {
  opacity: 1;
  transform: translateY(-10px);
}

/* 7.2 Community Features */
.community-layout {
  display: grid;
  grid-template-columns: 280px 1fr 320px;
  gap: 20px;
  max-width: 1600px;
  margin: 0 auto;
  padding: 20px;
}

.community-sidebar {
  background: var(--glass-bg);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-md);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  overflow-y: auto;
  max-height: calc(100vh - 150px);
  position: sticky;
  top: 90px;
}

.community-feed {
  background: var(--glass-bg);
  border-radius: var(--radius-lg);
  padding: 25px;
  box-shadow: var(--shadow-md);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
}

.activity-card {
  background: var(--color-bg-primary);
  border-radius: var(--radius-lg);
  margin-bottom: 25px;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.activity-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

/* ---------------------------------------------------------------------
 * 8. Accessibility Enhancements
 * --------------------------------------------------------------------- */

/* Improved keyboard focus */
:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

:focus:not(:focus-visible) {
  outline: none;
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Skip to content link */
.skip-to-content {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: white;
  padding: 8px;
  z-index: 100;
  transition: top 0.3s;
}

.skip-to-content:focus {
  top: 0;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, ::before, ::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  
  .transform-hover-scale,
  .transform-hover-lift {
    transform: none !important;
  }
}

/* High contrast mode support */
@media (forced-colors: active) {
  .card, .button, .btn, .alert, .badge, .toast {
    border: 1px solid currentColor;
  }
}

/* ---------------------------------------------------------------------
 * 9. Responsive Behavior
 * --------------------------------------------------------------------- */

/* Mobile (< 640px) */
@media (max-width: 639px) {
  :root {
    --content-padding: var(--spacing-3);
    --font-size-4xl: 2rem;
    --font-size-3xl: 1.75rem;
    --font-size-2xl: 1.5rem;
  }
  
  .container {
    padding-left: var(--spacing-3);
    padding-right: var(--spacing-3);
  }
  
  .section {
    padding-top: var(--spacing-8);
    padding-bottom: var(--spacing-8);
  }
  
  .grid-cols-2,
  .grid-cols-3,
  .grid-cols-4,
  .grid-cols-5,
  .grid-cols-6 {
    grid-template-columns: 1fr;
  }
  
  .navbar-nav {
    display: none;
  }
  
  .mobile-menu-toggle {
    display: block;
  }
  
  .community-layout {
    grid-template-columns: 1fr;
    gap: 15px;
  }
  
  .mascot-container {
    width: 80px;
    height: 80px;
  }
}

/* Tablet (640px - 1023px) */
@media (min-width: 640px) and (max-width: 1023px) {
  .grid-cols-3,
  .grid-cols-4,
  .grid-cols-5,
  .grid-cols-6 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .community-layout {
    grid-template-columns: 220px 1fr;
    gap: 15px;
  }
}

/* Desktop (1024px+) */
@media (min-width: 1024px) {
  .mobile-menu {
    display: none;
  }
}

/* Large Desktop (1280px+) */
@media (min-width: 1280px) {
  :root {
    --content-padding: var(--spacing-6);
  }
  
  .container {
    max-width: var(--content-max-width);
  }
}

/* ---------------------------------------------------------------------
 * 10. Print Styles
 * --------------------------------------------------------------------- */

@media print {
  body {
    background: white !important;
    color: black !important;
    font-size: 12pt;
  }
  
  .no-print,
  .navbar,
  .footer,
  .sidebar,
  .mascot-container,
  .toast-container {
    display: none !important;
  }
  
  a[href]:after {
    content: " (" attr(href) ")";
  }
  
  .container,
  .section,
  .card {
    width: 100%;
    margin: 0;
    padding: 0;
    border: none;
    box-shadow: none;
  }
  
  h1, h2, h3, h4, h5, h6 {
    page-break-after: avoid;
    page-break-inside: avoid;
  }
  
  img {
    page-break-inside: avoid;
    max-width: 100% !important;
  }
  
  p, h2, h3 {
    orphans: 3;
    widows: 3;
  }
}

/* ---------------------------------------------------------------------
 * Animation Keyframes
 * --------------------------------------------------------------------- */

@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes ping {
  75%, 100% { transform: scale(2); opacity: 0; }
}

@keyframes pulse {
  50% { opacity: .5; }
}

@keyframes bounce {
  0%, 100% { transform: translateY(-25%); animation-timing-function: cubic-bezier(0.8,0,1,1); }
  50% { transform: none; animation-timing-function: cubic-bezier(0,0,0.2,1); }
}

@keyframes float {
  0% { transform: translateY(0px); }
  50% { transform: translateY(-15px); }
  100% { transform: translateY(0px); }
}

@keyframes gradient-shift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* Legacy Support - Map old variable names to new standardized ones */
:root {
  /* Map old color variables to new standardized ones */
  --primary-color: var(--color-primary);
  --primary-color-rgb: var(--color-primary-rgb);
  --primary-light: var(--color-primary-light);
  --primary-dark: var(--color-primary-dark);
  --secondary-color: var(--color-secondary);
  --secondary-light: var(--color-secondary-light);
  --secondary-dark: var(--color-secondary-dark);
  --accent-color: var(--color-accent);
  --accent-light: var(--color-accent-light);
  --accent-dark: var(--color-accent-dark);
  --success-color: var(--color-success);
  --danger-color: var(--color-error);
  --warning-color: var(--color-warning);
  --info-color: var(--color-info);
  
  /* Map background color variables */
  --bg-card: var(--glass-bg);
  --bg-card-hover: rgba(255, 255, 255, 0.12);
  
  /* Map typography variables */
  --font-body: var(--font-family-primary);
  
  /* Map UI element variables */
  --border-radius: var(--radius-lg);
  --card-radius: var(--radius-card);
  --spacing: var(--spacing-base);
  --box-shadow: var(--shadow-md);
  --neon-glow: 0 0 8px rgba(var(--color-primary-rgb), 0.5);
  --hover-scale: var(--transform-hover-scale);
  --button-radius: var(--radius-button);
}