.lesson-two-track span { width: 14.3%; }
.topology-page { max-width: 1380px; }
.rack {
  overflow: hidden;
  border-radius: 16px;
  background: #0d110d;
  box-shadow: var(--shadow);
}
.rack-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--line-strong);
  background: #202620;
  font: 500 .72rem "IBM Plex Mono", monospace;
  direction: ltr;
}
.rack-header div:first-child { display: flex; gap: 12px; align-items: center; }
.rack-header span { color: var(--orange); }
.rack-health { display: inline-flex; align-items: center; gap: 8px; color: var(--green); }
.rack-health i { width: 8px; height: 8px; border-radius: 50%; background: var(--green); }
.rack-grid {
  display: grid;
  grid-template-columns: 260px 1fr 310px;
  min-height: 560px;
}
.app-bank, .operator-console { padding: 20px; background: #141914; }
.app-bank { border-left: 1px solid var(--line); }
.operator-console { border-right: 1px solid var(--line); }
.module-title { margin-bottom: 16px; }
.module-title span { display: block; color: var(--muted); font: 500 .66rem "IBM Plex Mono", monospace; text-transform: uppercase; }
.module-title strong { display: block; margin-top: 3px; font-size: .9rem; }
.app-module {
  display: grid;
  grid-template-columns: auto 1fr;
  width: 100%;
  gap: 2px 12px;
  margin-top: 8px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #0c100c;
  text-align: right;
  cursor: pointer;
}
.app-module > span { grid-row: 1 / span 2; align-self: center; color: var(--amber); font: 500 .58rem "IBM Plex Mono", monospace; }
.app-module strong { font-size: .78rem; }
.app-module small { color: var(--muted); font: 400 .62rem "IBM Plex Mono", monospace; }
.app-module.selected { border-color: var(--orange); background: var(--orange-soft); }
.app-note { margin-top: 20px; color: var(--muted); font-size: .7rem; }
.site-bays { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; padding: 20px; align-content: start; }
.site-bay {
  min-width: 0;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
  transition: border-color .18s ease-out, transform .18s ease-out;
}
.site-bay.active { border-color: var(--blue); transform: translateY(-3px); }
.site-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding-bottom: 14px; border-bottom: 1px solid var(--line); }
.site-head span { display: block; color: var(--muted); font: 500 .62rem "IBM Plex Mono", monospace; }
.site-head strong { font-size: .84rem; }
.site-head button, .command-button {
  border: 0;
  border-radius: 9px;
  background: var(--surface-3);
  color: var(--bone);
  padding: 9px 12px;
  cursor: pointer;
}
.site-head button:focus-visible, .command-button:focus-visible, .app-module:focus-visible { outline: 3px solid var(--orange); outline-offset: 3px; }
.site-bay dl { display: grid; gap: 8px; margin: 16px 0; }
.site-bay dl div { display: flex; justify-content: space-between; gap: 12px; font: 500 .66rem "IBM Plex Mono", monospace; }
.site-bay dt { color: var(--muted); }
.site-bay dd { margin: 0; color: var(--bone); }
.installed-apps { display: flex; flex-wrap: wrap; gap: 6px; min-height: 30px; }
.installed-apps span { padding: 5px 8px; border-radius: 7px; background: var(--green-soft); color: var(--green); font: 500 .58rem "IBM Plex Mono", monospace; }
.command-stack { display: grid; gap: 9px; }
.command-button { min-height: 44px; text-align: right; }
.command-button.danger:not(:disabled) { color: var(--red); background: var(--red-soft); }
.command-button:disabled { cursor: not-allowed; color: #687168; opacity: .65; }
.console-output { margin-top: 18px; padding: 14px; border-radius: 10px; background: #080b08; direction: ltr; text-align: left; }
.console-output span { display: block; color: var(--muted); font: 500 .58rem "IBM Plex Mono", monospace; text-transform: uppercase; }
.console-output code { display: block; margin-top: 8px; color: var(--amber); white-space: pre-wrap; word-break: break-word; font: 400 .68rem/1.6 "IBM Plex Mono", monospace; }
.isolation-meter { margin-top: 22px; }
.isolation-meter > span { color: var(--muted); font-size: .66rem; }
.isolation-meter div { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 10px; margin-top: 8px; color: var(--green); font-size: .68rem; }
.isolation-meter i { height: 1px; background: var(--green); }
.architecture-explainer {
  display: grid;
  grid-template-columns: .8fr 1.2fr;
  align-items: center;
  gap: 34px;
  margin-top: 68px;
  padding: 36px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.architecture-explainer h2, .mission-panel h2 { margin: 0 0 10px; font-size: clamp(1.6rem, 3vw, 2.6rem); letter-spacing: -.025em; }
.architecture-explainer p, .mission-panel p { margin: 0; color: var(--muted); }
.boundary-diagram { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; direction: ltr; }
.boundary { padding: 18px; border-radius: 12px; background: var(--surface-2); }
.boundary span { display: block; color: var(--muted); font: 500 .64rem "IBM Plex Mono", monospace; }
.boundary strong { font-size: .82rem; }
.bench-boundary { grid-column: 1 / -1; border: 1px solid var(--orange); }
.site-boundary { border: 1px solid var(--blue); }
.mission-panel { margin-top: 68px; }
.mission-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin: 22px 0 14px; padding: 0; list-style: none; counter-reset: mission; }
.mission-list li { min-height: 104px; padding: 16px; border-radius: 12px; background: var(--surface-2); color: var(--muted); font-size: .72rem; }
.mission-list li i { display: block; width: 9px; height: 9px; margin-bottom: 18px; border-radius: 50%; background: #4a554a; }
.mission-list li[data-state="complete"] { background: var(--green-soft); color: var(--bone); }
.mission-list li[data-state="complete"] i { background: var(--green); }
.mission-list code { direction: ltr; color: var(--amber); font: 500 .68rem "IBM Plex Mono", monospace; }
.mission-result { display: flex; justify-content: space-between; gap: 16px; align-items: center; padding: 16px 18px; border-radius: 12px; background: var(--surface-2); }
.mission-result span { color: var(--amber); font: 500 .68rem "IBM Plex Mono", monospace; text-transform: uppercase; }
.mission-result strong { font-size: .78rem; }
.mission-result[data-state="complete"] { background: var(--green-soft); }
.mission-result[data-state="complete"] span { color: var(--green); }
.topology-completion { margin-top: 28px; }

@media (max-width: 1050px) {
  .rack-grid { grid-template-columns: 220px 1fr; }
  .operator-console { grid-column: 1 / -1; border-top: 1px solid var(--line); border-right: 0; }
  .command-stack { grid-template-columns: 1fr 1fr 1fr; }
}
@media (max-width: 760px) {
  .rack-grid { grid-template-columns: 1fr; }
  .app-bank { border-left: 0; border-bottom: 1px solid var(--line); }
  .site-bays { grid-template-columns: 1fr; padding: 14px; }
  .operator-console { grid-column: auto; }
  .command-stack { grid-template-columns: 1fr; }
  .architecture-explainer { grid-template-columns: 1fr; }
  .mission-list { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .rack-header { align-items: flex-start; flex-direction: column; }
  .mission-list { grid-template-columns: 1fr; }
  .boundary-diagram { grid-template-columns: 1fr; }
  .bench-boundary { grid-column: auto; }
  .mission-result { align-items: flex-start; flex-direction: column; }
}