* { box-sizing: border-box; }

body { margin: 0; font-family: monospace; background: white; }

nav {
  position: fixed;
  top: 0; left: 0;
  font-family: monospace;
  font-size: 0.85em;
  padding: 12px 20px;
  z-index: 100;
  background: rgba(248,248,248,0.85);
}
nav a { color: inherit; text-decoration: none; }
nav a:hover { text-decoration: underline; }

.hero {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}
.hint { font-size: 0.85em; color: #aaa; margin: 0; }

.section {
  padding: 80px 40px;
  max-width: 640px;
  margin: 0 auto;
}

.fade-block {
  margin-bottom: 64px;
  opacity: 0;
  transform: translateY(24px);
}
.fade-block h2 { font-size: 1.2em; margin: 0 0 8px; }
.fade-block p  { margin: 0; color: #555; line-height: 1.7; }
.fade-block code { background: #ebebeb; padding: 1px 4px; }

.parallax-section {
  position: relative;
  height: 400px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.parallax-bg {
  position: absolute;
  inset: -80px 0;
  background: #222;
  will-change: transform;
}
.parallax-label {
  position: relative;
  color: #555;
  font-size: 0.72em;
  letter-spacing: 0.12em;
  z-index: 1;
}