:root {
  --color-bg: #0a0e1a;
  --color-surface: #131929;
  --color-surface-elevated: #1a2238;
  --color-accent: #00d4ff;
  --color-accent-secondary: #7b2fff;
  --color-text: #e8f0ff;
  --color-text-muted: #8a9bbf;
  --color-correct: #00e676;
  --color-wrong: #ff4444;

  --font-headline: "Orbitron", "Exo 2", "Segoe UI", "Roboto", sans-serif;
  --font-body: "Inter", "Roboto", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "Courier New", monospace;
  --font-size-base: 1rem;

  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;

  --radius-sm: 0.4rem;
  --radius-md: 0.7rem;
  --radius-lg: 1rem;

  --glow-color: rgba(0, 212, 255, 0.38);
  --glow-spread: 0 0 0.9rem;

  --max-content-width: 1100px;
  --line-height: 1.6;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

html {
  font-size: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  line-height: var(--line-height);
  background-color: var(--color-bg);
  background-image:
    linear-gradient(rgba(232, 240, 255, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(232, 240, 255, 0.08) 1px, transparent 1px),
    radial-gradient(circle at 10% 0%, rgba(123, 47, 255, 0.12), transparent 35%);
  background-size: 26px 26px, 26px 26px, auto;
  color: var(--color-text);
  overflow-x: hidden;
}

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

main {
  width: min(100%, var(--max-content-width));
  margin: 0 auto;
  padding: var(--spacing-lg) var(--spacing-md) var(--spacing-xl);
}

section {
  margin-block: var(--spacing-xl);
}

a {
  color: var(--color-accent);
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

@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;
  }
}

@media (forced-colors: active) {
  body {
    background-image: none;
  }

  * {
    box-shadow: none !important;
    text-shadow: none !important;
  }
}