:root {
  --nav: 2.5rem;
  --stick: 0.5rem;
  --step: 1.75rem;
  --scroll-tick: 26vh;
  --overlap: 22vh;
  --mono: 'IBM Plex Mono', monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body { font-family: var(--mono); background: #0d0d0f; 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; font-weight: 600; }

.mount { max-width: 560px; margin: 0 auto; padding-top: var(--nav); }

.scroll-section { height: var(--scroll-tick); position: relative; }
.scroll-section--final { height: 16vh; min-height: 180px; }
.stop { height: 1px; margin-bottom: 3rem; }

.frame {
  position: sticky;
  margin: 0 0.75rem calc(-1 * var(--overlap)) 0.75rem;
  border-left: 3px solid #3a3a44;
  background: #141418;
  padding: 0.6rem 0 0.6rem 0.9rem;
  box-shadow: 0 6px 0 #0a0a0c, 0 12px 24px rgba(0,0,0,0.4);
}

.frame code {
  display: block;
  font-size: 0.66rem;
  color: #6b9b6b;
  margin-bottom: 0.35rem;
}

.frame-body strong { color: #e8e6e3; font-weight: 500; }
.frame-body p { color: #6b6966; font-size: 0.72rem; margin-top: 0.15rem; }
.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;
  margin-bottom: 0;
}

.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; }