/* ===== ONLY FOR CS STUDENTS - Design System ===== */
:root {
  /* Primary Colors - Blue */
  --primary-50: #EBF5FF;
  --primary-100: #D6EBFF;
  --primary-200: #ADD6FF;
  --primary-300: #70B8FF;
  --primary-400: #3D9EFF;
  --primary-500: #1A73E8;
  --primary-600: #0D5FC2;
  --primary-700: #0A4A99;
  --primary-800: #073670;
  --primary-900: #042347;

  /* Gold Accent */
  --gold-50: #FFF9E6;
  --gold-100: #FFF0BF;
  --gold-200: #FFE699;
  --gold-300: #FFD966;
  --gold-400: #FFCC33;
  --gold-500: #F5A623;
  --gold-600: #D4911A;
  --gold-700: #B37A14;
  --gold-800: #8C600F;
  --gold-900: #664609;

  /* Neutral / Gray */
  --gray-50: #F8FAFC;
  --gray-100: #F1F5F9;
  --gray-200: #E2E8F0;
  --gray-300: #CBD5E1;
  --gray-400: #94A3B8;
  --gray-500: #64748B;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1E293B;
  --gray-900: #0F172A;

  /* Semantic Colors */
  --success: #10B981;
  --success-light: #D1FAE5;
  --warning: #F59E0B;
  --warning-light: #FEF3C7;
  --error: #EF4444;
  --error-light: #FEE2E2;
  --info: #3B82F6;
  --info-light: #DBEAFE;

  /* Background */
  --bg-primary: #FFFFFF;
  --bg-secondary: #F8FAFC;
  --bg-tertiary: #F1F5F9;
  --bg-dark: #0F172A;
  --bg-card: #FFFFFF;
  --bg-overlay: rgba(15, 23, 42, 0.6);

  /* Text */
  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-tertiary: #94A3B8;
  --text-inverse: #FFFFFF;
  --text-link: #1A73E8;

  /* Borders */
  --border-light: #E2E8F0;
  --border-medium: #CBD5E1;
  --border-focus: #1A73E8;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --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-2xl: 0 25px 50px -12px rgba(0,0,0,0.25);
  --shadow-gold: 0 4px 14px rgba(245, 166, 35, 0.3);
  --shadow-blue: 0 4px 14px rgba(26, 115, 232, 0.3);

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #1A73E8 0%, #0D47A1 100%);
  --gradient-gold: linear-gradient(135deg, #F5A623 0%, #FFD966 100%);
  --gradient-hero: linear-gradient(135deg, #0A1628 0%, #1A3A5C 50%, #0D47A1 100%);
  --gradient-card: linear-gradient(180deg, rgba(255,255,255,0) 0%, rgba(26,115,232,0.03) 100%);
  --gradient-dark: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
  --gradient-glass: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0.05) 100%);

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-display: 'Outfit', 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --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;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;

  --font-light: 300;
  --font-regular: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  --font-extrabold: 800;

  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
  --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Z-index */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-overlay: 300;
  --z-modal: 400;
  --z-popover: 500;
  --z-tooltip: 600;
  --z-toast: 700;

  /* Container */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1440px;

  /* Header */
  --header-height: 72px;
}

/* ===== Dark Mode ===== */
[data-theme="dark"] {
  --bg-primary: #0F172A;
  --bg-secondary: #1E293B;
  --bg-tertiary: #334155;
  --bg-card: #1E293B;
  --bg-overlay: rgba(0, 0, 0, 0.7);

  --text-primary: #F1F5F9;
  --text-secondary: #CBD5E1;
  --text-tertiary: #64748B;
  --text-link: #70B8FF;

  --border-light: #334155;
  --border-medium: #475569;

  --shadow-xs: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.4), 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.4), 0 2px 4px -1px rgba(0,0,0,0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.4), 0 4px 6px -2px rgba(0,0,0,0.3);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.5), 0 10px 10px -5px rgba(0,0,0,0.3);
}