/**
 * Nova Academy - Design System
 * Gold & Black Theme - Modern Premium Design
 * 
 * Color Palette:
 * - Primary Gold: #FFD700
 * - Dark Gold: #D4AF37  
 * - Bronze Gold: #B8860B
 * - Background Dark: #0a0a0a
 * - Background Card: #111111
 * - Background Light: #1a1a1a
 * - Text Primary: #ffffff
 * - Text Secondary: #a0a0a0
 * - Border Gold: rgba(255, 215, 0, 0.3)
 */

/* ============================================
   CSS VARIABLES
   ============================================ */
:root {
  /* Gold Colors */
  --gold-primary: #FFD700;
  --gold-dark: #D4AF37;
  --gold-bronze: #B8860B;
  --gold-light: #FFE55C;
  --gold-gradient: linear-gradient(135deg, #FFD700 0%, #D4AF37 50%, #B8860B 100%);
  --gold-gradient-hover: linear-gradient(135deg, #FFE55C 0%, #FFD700 50%, #D4AF37 100%);
  --gold-glow: 0 0 20px rgba(255, 215, 0, 0.4);
  --gold-glow-strong: 0 0 40px rgba(255, 215, 0, 0.6);
  
  /* Background Colors */
  --bg-darkest: #0a0a0a;
  --bg-dark: #111111;
  --bg-card: #161616;
  --bg-light: #1a1a1a;
  --bg-lighter: #222222;
  --bg-hover: #252525;
  
  /* Text Colors */
  --text-primary: #ffffff;
  --text-secondary: #a0a0a0;
  --text-muted: #707070;
  --text-gold: #FFD700;
  
  /* Border Colors */
  --border-gold: rgba(255, 215, 0, 0.3);
  --border-gold-hover: rgba(255, 215, 0, 0.5);
  --border-dark: #2a2a2a;
  --border-darker: #333333;
  
  /* Status Colors */
  --success: #22c55e;
  --error: #ef4444;
  --warning: #f59e0b;
  --info: #3b82f6;
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-display: 'Playfair Display', Georgia, serif;
  
  /* Font Sizes */
  --text-xs: 0.75rem;      /* 12px */
  --text-sm: 0.875rem;     /* 14px */
  --text-base: 1rem;       /* 16px */
  --text-lg: 1.125rem;     /* 18px */
  --text-xl: 1.25rem;      /* 20px */
  --text-2xl: 1.5rem;      /* 24px */
  --text-3xl: 1.875rem;    /* 30px */
  --text-4xl: 2.25rem;     /* 36px */
  --text-5xl: 3rem;        /* 48px */
  --text-6xl: 3.75rem;     /* 60px */
  
  /* Font Weights */
  --font-light: 300;
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  
  /* Spacing Scale */
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.25rem;   /* 20px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-10: 2.5rem;   /* 40px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */
  --space-20: 5rem;     /* 80px */
  --space-24: 6rem;     /* 96px */
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.6);
  --shadow-gold: 0 0 30px rgba(255, 215, 0, 0.15);
  --shadow-gold-lg: 0 0 50px rgba(255, 215, 0, 0.25);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
  --transition-bounce: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
  
  /* Z-index Scale */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
  --z-popover: 600;
  --z-tooltip: 700;
  
  /* Container Widths */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1536px;
}

/* ============================================
   BASE STYLES & RESET
   ============================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-primary);
  font-size: var(--text-base);
  font-weight: var(--font-normal);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-darkest);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Selection */
::selection {
  background-color: var(--gold-primary);
  color: var(--bg-darkest);
}

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

::-webkit-scrollbar-track {
  background: var(--bg-dark);
}

::-webkit-scrollbar-thumb {
  background: var(--border-dark);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--gold-dark);
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

/* Headings */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: var(--font-semibold);
  line-height: 1.2;
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-3xl); }
h4 { font-size: var(--text-2xl); }
h5 { font-size: var(--text-xl); }
h6 { font-size: var(--text-lg); }

/* Display Heading (for hero) */
.display-1 {
  font-family: var(--font-display);
  font-size: var(--text-6xl);
  font-weight: var(--font-bold);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.display-2 {
  font-family: var(--font-display);
  font-size: var(--text-5xl);
  font-weight: var(--font-semibold);
  line-height: 1.15;
}

/* Gold Accent Text */
.text-gold {
  color: var(--gold-primary);
  background: var(--gold-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Paragraph */
p {
  margin-bottom: var(--space-4);
  color: var(--text-secondary);
}

/* Links */
a {
  color: var(--gold-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--gold-light);
}

/* Lists */
ul, ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
}

li {
  margin-bottom: var(--space-2);
  color: var(--text-secondary);
}

/* Code */
code {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: var(--text-sm);
  background-color: var(--bg-card);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  color: var(--gold-primary);
}

/* Blockquote */
blockquote {
  border-left: 3px solid var(--gold-primary);
  padding-left: var(--space-4);
  margin: var(--space-6) 0;
  font-style: italic;
  color: var(--text-secondary);
}

/* Horizontal Rule */
hr {
  border: none;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-dark), transparent);
  margin: var(--space-8) 0;
}

/* ============================================
   IMAGES & MEDIA
   ============================================ */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

figure {
  margin: var(--space-6) 0;
}

figcaption {
  text-align: center;
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin-top: var(--space-2);
}

/* ============================================
   FORMS & INPUTS
   ============================================ */
input,
textarea,
select {
  font-family: var(--font-primary);
  font-size: var(--text-base);
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
}

/* Placeholder */
::placeholder {
  color: var(--text-muted);
  opacity: 0.7;
}

/* ============================================
   ANIMATION KEYFRAMES
   ============================================ */

/* Fade In */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* Fade In Up */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Fade In Down */
@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Slide In Left */
@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Slide In Right */
@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Scale In */
@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* Shimmer Effect (for loading/buttons) */
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* Gold Pulse Glow */
@keyframes goldPulse {
  0%, 100% { box-shadow: var(--shadow-gold); }
  50% { box-shadow: var(--shadow-gold-lg); }
}

/* Rotate */
@keyframes rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* Bounce */
@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* Pulse */
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* Shake (for errors) */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  75% { transform: translateX(5px); }
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

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

/* Visually Hidden but Accessible */
.visually-hidden {
  position: absolute;
  left: -10000px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}