:root {
  --nav: 2.5rem; --stick: 1rem; --step: 1.1rem; --unit: 56vh;
  --mono: 'IBM Plex Mono', monospace; --sans: 'Instrument Sans', system-ui, sans-serif;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: var(--sans); background: #2a2824; color: #1a1814; }
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; gap: 1rem; padding: 0.5rem 1rem; font-family: var(--mono); font-size: 0.62rem;
  background: rgba(42,40,36,0.95); color: #c4b8a8;
}
.nav a { color: #8a8278; text-decoration: none; }
.depth { margin-left: auto; color: #d4a574; font-weight: 600; }
.mount { max-width: 520px; margin: 0 auto; padding-top: var(--nav); }
.scroll-section { height: var(--unit); }
.scroll-section--final { height: calc(var(--unit) * 0.5); min-height: 240px; }
.stop { height: 1px; margin-bottom: 3rem; }
.folder {
  position: sticky;
  margin-left: 2.5rem;
  background: #e8e2d4;
  border: 1px solid #c4b8a8;
  border-radius: 0 6px 6px 6px;
  box-shadow: 4px 4px 0 rgba(0,0,0,0.15), 0 12px 28px rgba(0,0,0,0.25);
  min-height: 140px;
}
.tab {
  position: absolute;
  left: -2.5rem;
  top: 0;
  width: 2.35rem;
  height: 100%;
  min-height: 120px;
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  font-family: var(--mono);
  font-size: 0.55rem;
  letter-spacing: 0.06em;
  padding: 0.5rem 0.25rem;
  border-radius: 6px 0 0 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 500;
}
.f0 { top: calc(var(--nav) + var(--stick)); z-index: 1; }
.f0 .tab { background: #c9a86c; color: #2a2824; }
.f1 { top: calc(var(--nav) + var(--stick) + var(--step)); z-index: 2; }
.f1 .tab { background: #a8c4d4; }
.f2 { top: calc(var(--nav) + var(--stick) + var(--step)*2); z-index: 3; }
.f2 .tab { background: #b8d4a8; }
.f3 { top: calc(var(--nav) + var(--stick) + var(--step)*3); z-index: 4; }
.f3 .tab { background: #d4b8c4; }
.f4 { top: calc(var(--nav) + var(--stick) + var(--step)*4); z-index: 5; }
.f4 .tab { background: #d4c8a8; }
.f5 { top: calc(var(--nav) + var(--stick) + var(--step)*5); z-index: 6; }
.f5 .tab { background: #c4c4c4; }
.f6 { top: calc(var(--nav) + var(--stick) + var(--step)*6); z-index: 7; }
.f6 .tab { background: #2a4a6b; color: #e8e2d4; }
.body { padding: 1.1rem 1.25rem; }
.body h1, .body h2 { font-size: 1.2rem; margin-bottom: 0.35rem; }
.body p { font-size: 0.88rem; color: #4a4844; }
.body a { color: #2a4a6b; }
.avail { font-family: var(--mono); font-size: 0.65rem; color: #3d6b3d; margin-top: 0.35rem; }
.btn { font-family: var(--mono); font-size: 0.68rem; padding: 0.4rem 0.7rem; background: #2a4a6b; color: #fff; text-decoration: none; border-radius: 3px; margin-right: 0.35rem; }
.btn.ghost { background: transparent; color: #2a4a6b; border: 1px solid #2a4a6b; }
.foot { display: flex; justify-content: space-between; max-width: 520px; margin: 0 auto; padding: 0 1rem 2rem; font-family: var(--mono); font-size: 0.6rem; color: #6a6458; }
.foot a { color: #6a6458; text-decoration: none; }