* { margin: 0; padding: 0; box-sizing: border-box; }
a, a:visited, a:active { color: inherit; text-decoration: none; }

:root { --bg: #0a0a0c; --fg: #00ff41; --fg-rgb: 0,255,65; --font: Georgia, serif; }
[data-theme="amber"] { --bg: #1a1510; --fg: #ff8c00; --fg-rgb: 255,140,0; }
[data-theme="cyan"] { --bg: #f0f4f8; --fg: #0055aa; --fg-rgb: 0,85,170; }
[data-theme="bone"] { --bg: #fffff0; --fg: #2a2420; --fg-rgb: 42,36,32; }
[data-theme="cerulean"] { --bg: #2a7ab5; --fg: #f0ece4; --fg-rgb: 240,236,228; }
[data-theme="jungle"] { --bg: #1a2e1a; --fg: #ff6a1a; --fg-rgb: 255,106,26; }
[data-font="sans"] { --font: 'Inter', sans-serif; }
[data-font="mono"] { --font: 'JetBrains Mono', monospace; }
[data-font="pixel"] { --font: 'Silkscreen', cursive; }

html, body {
  width: 100%; height: 100%;
  background: var(--bg); color: var(--bg);
  cursor: crosshair;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Background grain */
html::after {
  content: '';
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: 0;
  pointer-events: none;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 256px 256px;
}

/* --- Nav --- */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  max-width: 640px;
  margin: 0 auto;
  padding: 32px 40px;
  font: 13px/1 var(--font);
  letter-spacing: 0.03em;
  text-transform: lowercase;
}

.nav-logo {
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.01em;
  text-transform: none;
}

.nav-links {
  display: flex;
  gap: 28px;
}

.nav-links a.nav-active .reveal-span {
  border-bottom: 1px solid currentColor;
}

/* --- Content --- */

.content {
  max-width: 640px;
  margin: 0 auto;
  padding: 120px 40px 100px;
  font: 17px/1.75 var(--font);
  letter-spacing: 0.01em;
}

h1 {
  font: 300 38px/1.15 var(--font);
  letter-spacing: -0.02em;
  margin-bottom: 48px;
}

h2 {
  font: 400 21px/1.35 var(--font);
  letter-spacing: -0.01em;
  margin-bottom: 14px;
  margin-top: 48px;
}

h2:first-of-type { margin-top: 0; }

p {
  margin-bottom: 28px;
}

p:last-child { margin-bottom: 0; }

/* --- Links --- */

.content a .reveal-span {
  border-bottom: 1px solid currentColor;
  padding-bottom: 1px;
}

/* --- Reveal spans --- */

.reveal-span { color: transparent; transition: none; }

/* --- Pickers --- */

.pickers {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 12px;
  opacity: 0.35;
  transition: opacity 0.3s;
}

.pickers:hover { opacity: 1; }

.theme-picker, .font-picker {
  display: flex;
  gap: 10px;
}

.theme-swatch {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  outline: none;
  box-shadow: 0 0 0 2px transparent;
}

.theme-swatch:hover { transform: scale(1.4); }
.theme-swatch.active { box-shadow: 0 0 0 2px var(--bg), 0 0 0 3.5px var(--fg); }
.theme-swatch[data-swatch="matrix"] { background: #00ff41; }
.theme-swatch[data-swatch="amber"] { background: #ff8c00; }
.theme-swatch[data-swatch="cyan"] { background: #0055aa; }
.theme-swatch[data-swatch="bone"] { background: #2a2420; }
.theme-swatch[data-swatch="cerulean"] { background: #2a7ab5; }
.theme-swatch[data-swatch="jungle"] { background: #1a2e1a; }

.font-swatch {
  font-size: 10px;
  line-height: 1;
  padding: 3px 5px;
  border: 1px solid transparent;
  border-radius: 2px;
  cursor: pointer;
  color: var(--fg);
  background: transparent;
  opacity: 0.5;
  transition: opacity 0.2s, border-color 0.2s;
  letter-spacing: 0.03em;
}

.font-swatch:hover { opacity: 1; }
.font-swatch.active { opacity: 1; border-color: var(--fg); }
.font-swatch[data-font="serif"] { font-family: Georgia, serif; }
.font-swatch[data-font="sans"] { font-family: 'Inter', sans-serif; }
.font-swatch[data-font="mono"] { font-family: 'JetBrains Mono', monospace; }
.font-swatch[data-font="pixel"] { font-family: 'Silkscreen', cursive; }

/* --- Canvas --- */

.scramble-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 2147483647;
  pointer-events: none;
}