/* ============================================
   VARIABLES
   ============================================ */
:root {
  /* Colors - Hades Dark Fantasy Theme */
  --color-bg-primary: #0a0a0a;
  --color-bg-secondary: #111111;
  --color-bg-tertiary: #1a1a1a;
  --color-bg-elevated: #262626;
  
  --color-text-primary: #fafafa;
  --color-text-secondary: #a3a3a3;
  --color-text-muted: #737373;
  
  --color-primary: #dc2626;
  --color-primary-hover: #b91c1c;
  --color-primary-glow: rgba(220, 38, 38, 0.4);
  
  --color-accent: #fbbf24;
  --color-accent-hover: #f59e0b;
  --color-accent-glow: rgba(251, 191, 36, 0.3);
  
  --color-success: #22c55e;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;
  
  --color-border: #262626;
  --color-border-hover: #404040;
  
  /* Typography */
  --font-display: 'Cinzel', 'Cormorant Garamond', Georgia, serif;
  --font-body: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 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;
  
  --leading-none: 1;
  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  --leading-loose: 2;
  
  /* Spacing Scale (0-96px) */
  --space-0: 0;
  --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;
  --space-40: 10rem;
  --space-48: 12rem;
  --space-64: 16rem;
  --space-96: 24rem;
  
  /* Radius */
  --radius-none: 0;
  --radius-sm: 0.125rem;
  --radius-md: 0.25rem;
  --radius-lg: 0.5rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Shadows - Dark theme optimized */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.6), 0 2px 4px -2px rgba(0, 0, 0, 0.6);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.7), 0 4px 6px -4px rgba(0, 0, 0, 0.7);
  --shadow-glow-crimson: 0 0 20px var(--color-primary-glow);
  --shadow-glow-gold: 0 0 20px var(--color-accent-glow);
  
  /* Transitions */
  --duration-instant: 0ms;
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --duration-slow: 350ms;
  --duration-slower: 500ms;
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
  
  /* Layout */
  --container-max: 1280px;
  --container-padding: var(--space-4);
}

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

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  min-height: 100vh;
  line-height: var(--leading-normal);
  text-rendering: optimizeLegibility;
}

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

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

p,
h1,
h2,
h3,
h4,
h5,
h6 {
  overflow-wrap: break-word;
}

ul,
ol {
  list-style: none;
}

a {
  text-decoration: none;
  color: inherit;
}

/* ============================================
   BASE STYLES
   ============================================ */
body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  background-image: 
    radial-gradient(circle at 20% 50%, rgba(220, 38, 38, 0.03) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(251, 191, 36, 0.02) 0%, transparent 50%);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: var(--leading-tight);
  letter-spacing: -0.02em;
  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); }

@media (max-width: 768px) {
  h1 { font-size: var(--text-4xl); }
  h2 { font-size: var(--text-3xl); }
  h3 { font-size: var(--text-2xl); }
}

p {
  margin-bottom: var(--space-4);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
}

a {
  color: var(--color-accent);
  transition: color var(--duration-fast) var(--ease-in-out);
}

a:hover {
  color: var(--color-accent-hover);
  text-shadow: 0 0 10px var(--color-accent-glow);
}

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

/* ============================================
   UTILITIES
   ============================================ */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

.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;
}

.flex { display: flex; }
.grid { display: grid; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-4 { gap: var(--space-4); }

/* ============================================
   COMPONENTS
   ============================================ */

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-in-out);
  background-color: var(--color-bg-elevated);
  color: var(--color-text-primary);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 0%, rgba(255,255,255,0.1) 100%);
  opacity: 0;
  transition: opacity var(--duration-fast) var(--ease-in-out);
}

.btn:hover::before {
  opacity: 1;
}

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

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background-color: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
  box-shadow: 0 0 15px var(--color-primary-glow);
}

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  box-shadow: 0 0 25px var(--color-primary-glow);
  transform: translateY(-1px);
}

.btn-accent {
  background-color: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.btn-accent:hover {
  background-color: var(--color-accent);
  color: var(--color-bg-primary);
  box-shadow: var(--shadow-glow-gold);
}

/* Inputs */
.input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: var(--text-base);
  transition: all var(--duration-fast) var(--ease-in-out);
}

.input:hover {
  border-color: var(--color-border-hover);
}

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

.input::placeholder {
  color: var(--color-text-muted);
}

/* Cards */
.card {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: all var(--duration-normal) var(--ease-in-out);
  position: relative;
  overflow: hidden;
}

.card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-in-out);
}

.card:hover {
  border-color: var(--color-border-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.card:hover::after {
  opacity: 0.5;
}

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