:root {
  --nav: 2.5rem; --stick: 0.9rem; --step: 1rem; --unit: 54vh;
  --bg: #0d0d0f; --mono: 'IBM Plex Mono', monospace;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: var(--mono); background: var(--bg); color: #b8b4af; font-size: 0.8rem; }
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; gap: 1rem; padding: 0.5rem 1rem; font-size: 0.62rem;
  background: rgba(13,13,15,0.95); border-bottom: 1px solid #2a2a30;
}
.nav a { color: #5a5854; text-decoration: none; }
.nav a:hover { color: #7eb87a; }
#depth { margin-left: auto; color: #7eb87a; }
.mount { max-width: 560px; margin: 0 auto; padding-top: var(--nav); }
.scroll-section { height: var(--unit); }
.scroll-section--final { height: calc(var(--unit) * 0.5); min-height: 200px; }
.stop { height: 1px; margin-bottom: 3rem; }
.frame {
  position: sticky;
  margin: 0 1rem;
  border-left: 3px solid #3a3a44;
  background: #141418;
  padding: 0.65rem 0 0.65rem 1rem;
  box-shadow: 0 4px 0 #0a0a0c, 0 8px 20px rgba(0,0,0,0.35);
}
.frame code {
  display: block;
  font-size: 0.68rem;
  color: #6b9b6b;
  margin-bottom: 0.45rem;
}
.frame-body strong { color: #e8e6e3; font-weight: 500; }
.frame-body p { color: #6b6966; font-size: 0.75rem; margin-top: 0.2rem; }
.frame-body a { color: #8b9cb3; text-decoration: none; }
.frame-body a:hover { color: #7eb87a; }
.f0 { top: calc(var(--nav) + var(--stick)); z-index: 1; border-color: #c4a574; }
.f1 { top: calc(var(--nav) + var(--stick) + var(--step)); z-index: 2; }
.f2 { top: calc(var(--nav) + var(--stick) + var(--step)*2); z-index: 3; }
.f3 { top: calc(var(--nav) + var(--stick) + var(--step)*3); z-index: 4; }
.f4 { top: calc(var(--nav) + var(--stick) + var(--step)*4); z-index: 5; border-color: #6b8b9b; }
.f5 { top: calc(var(--nav) + var(--stick) + var(--step)*5); z-index: 6; }
.f6 { top: calc(var(--nav) + var(--stick) + var(--step)*6); z-index: 7; border-color: #7eb87a; }
.foot {
  display: flex; justify-content: space-between; max-width: 560px; margin: 0 auto;
  padding: 0 1.5rem 2.5rem; font-size: 0.6rem; color: #3a3a40;
}
.foot a { color: #3a3a40; text-decoration: none; }