:root {
  --nav: 2.5rem;
  --stick: 0.5rem;
  --step: 1.7rem;
  --scroll-tick: 26vh;
  --overlap: 22vh;
  --rack: #12141a;
  --mono: 'IBM Plex Mono', monospace;
}

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

body {
  font-family: var(--mono);
  background: #08090c;
  color: #9ca3af;
  font-size: 0.75rem;
}

.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 200;
  display: flex; gap: 1rem; padding: 0.5rem 1rem; font-size: 0.62rem;
  background: rgba(8,9,12,0.95); border-bottom: 1px solid #1e2430;
}

.nav a { color: #5a6478; text-decoration: none; }
.nav a:hover { color: #4ade80; }
#depth { margin-left: auto; color: #4ade80; font-weight: 600; }

.rack-frame {
  max-width: 540px;
  margin: 0 auto;
  padding: calc(var(--nav) + 0.75rem) 0.75rem 0;
  border-left: 4px solid #2a3040;
  border-right: 4px solid #2a3040;
  background: linear-gradient(90deg, #0c0e14 0%, var(--rack) 8%, var(--rack) 92%, #0c0e14 100%);
  min-height: 100vh;
  box-shadow: inset 0 0 40px rgba(0,0,0,0.5);
}

.rack-label {
  font-size: 0.55rem;
  letter-spacing: 0.2em;
  color: #3a4458;
  padding: 0 0.5rem 0.75rem;
  border-bottom: 1px dashed #2a3040;
  margin-bottom: 0.5rem;
}

.mount { padding: 0 0.35rem; }

.scroll-section { height: var(--scroll-tick); position: relative; }
.scroll-section--final { height: 16vh; min-height: 160px; }
.stop { height: 1px; margin-bottom: 2rem; }

.unit {
  position: sticky;
  margin-bottom: calc(-1 * var(--overlap));
  border: 1px solid #2a3448;
  background: #161a22;
  border-radius: 2px;
  overflow: hidden;
  box-shadow: 0 4px 0 #0a0c10, inset 0 1px 0 rgba(255,255,255,0.04);
}

.unit-head {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.65rem;
  background: #1a2030;
  border-bottom: 1px solid #2a3448;
  font-size: 0.62rem;
  position: relative;
  z-index: 20;
}

.led {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #3a4458;
  flex-shrink: 0;
}

.led.on { background: #4ade80; box-shadow: 0 0 6px #4ade80; }
.led.blink { background: #fbbf24; animation: blink 1.2s ease infinite; }

@keyframes blink {
  50% { opacity: 0.35; }
}

.uid { color: #6b7280; font-weight: 600; min-width: 1.5rem; }
.svc { color: #9ca3af; text-transform: uppercase; letter-spacing: 0.08em; flex: 1; }
.unit-head a {
  color: #60a5fa;
  text-decoration: none;
  font-size: 0.58rem;
}

.unit-body {
  padding: 0.55rem 0.65rem 0.65rem;
  position: relative;
  z-index: 1;
}

.unit-body strong { color: #e5e7eb; font-weight: 500; display: block; margin-bottom: 0.15rem; }
.unit-body p { color: #6b7280; font-size: 0.68rem; }
.unit-body a { color: #60a5fa; text-decoration: none; }
.unit-body a:hover { text-decoration: underline; }

.u0 { top: calc(var(--nav) + var(--stick)); z-index: 1; }
.u1 { top: calc(var(--nav) + var(--stick) + var(--step)); z-index: 2; }
.u2 { top: calc(var(--nav) + var(--stick) + var(--step) * 2); z-index: 3; }
.u3 { top: calc(var(--nav) + var(--stick) + var(--step) * 3); z-index: 4; }
.u4 { top: calc(var(--nav) + var(--stick) + var(--step) * 4); z-index: 5; }
.u5 { top: calc(var(--nav) + var(--stick) + var(--step) * 5); z-index: 6; }
.u6 {
  top: calc(var(--nav) + var(--stick) + var(--step) * 6);
  z-index: 7;
  margin-bottom: 0;
}

.foot {
  display: flex; justify-content: space-between; max-width: 540px; margin: 0 auto;
  padding: 1rem 1.25rem 2rem; font-size: 0.58rem; color: #3a4458;
}
.foot a { color: #3a4458; text-decoration: none; }