:root {
  color-scheme: dark;
  --bg: #101418;
  --surface: #171d23;
  --surface-2: #202832;
  --line: #33404d;
  --text: #eef4f7;
  --muted: #a9b7c2;
  --teal: #1c8f86;
  --green: #55b879;
  --amber: #d9a441;
  --blue: #4b8edb;
  --red: #d2605d;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.5;
}

a {
  color: inherit;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  padding: 18px clamp(16px, 4vw, 44px);
  background: rgba(16, 20, 24, 0.96);
  border-bottom: 1px solid var(--line);
}

.topbar h1,
h2,
p {
  margin: 0;
}

.topbar h1 {
  font-size: clamp(22px, 3vw, 34px);
}

.topbar nav {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.topbar nav a,
.text-link,
.button-link {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
}

.topbar nav a:hover,
.text-link:hover,
.button-link:hover,
.doc-card:hover {
  border-color: var(--teal);
}

.button-link {
  background: var(--teal);
  border-color: var(--teal);
}

main {
  width: min(1180px, calc(100% - 28px));
  margin: 0 auto;
  padding: 24px 0 40px;
  display: grid;
  gap: 18px;
}

.summary-band,
.panel {
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 8px;
}

.summary-band {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  gap: 22px;
  padding: clamp(20px, 4vw, 34px);
  align-items: center;
}

.summary-band h2 {
  margin: 4px 0 10px;
  max-width: 780px;
  font-size: clamp(24px, 3.6vw, 44px);
  line-height: 1.12;
}

.summary-band p {
  color: var(--muted);
  max-width: 780px;
}

.eyebrow {
  color: var(--amber);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.status-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.status-grid div {
  min-height: 112px;
  padding: 14px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.status-grid span,
.doc-card span,
.node span {
  display: block;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.status-grid strong {
  display: block;
  margin: 8px 0 2px;
  font-size: 20px;
}

small {
  color: var(--muted);
}

.panel {
  padding: clamp(16px, 3vw, 24px);
}

.section-heading {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  margin-bottom: 18px;
}

.section-heading h2,
.panel h2 {
  margin-top: 4px;
  font-size: clamp(20px, 2.4vw, 30px);
}

.network-map {
  display: grid;
  justify-items: center;
  gap: 14px;
  padding: 12px 0 4px;
}

.node {
  width: min(100%, 320px);
  min-height: 96px;
  display: grid;
  align-content: center;
  gap: 3px;
  padding: 16px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--surface-2);
  text-align: center;
}

.node strong {
  font-size: 22px;
}

.internet {
  border-color: var(--blue);
}

.gateway {
  border-color: var(--red);
}

.service {
  border-color: var(--green);
}

.media {
  border-color: var(--teal);
}

.client {
  border-color: var(--amber);
}

.wifi {
  border-color: var(--blue);
}

.link-line {
  width: 2px;
  height: 28px;
  background: var(--line);
}

.branch-grid {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.split {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.panel p {
  color: var(--muted);
}

.checklist {
  padding-left: 20px;
  margin: 16px 0 0;
  color: var(--text);
}

.checklist li + li {
  margin-top: 8px;
}

.accent-panel {
  background: #1b2425;
  border-color: #2f5d59;
}

pre {
  max-width: 100%;
  overflow-x: auto;
  margin: 16px 0;
  padding: 14px;
  background: #0b0f12;
  border: 1px solid var(--line);
  border-radius: 6px;
}

code {
  font-family: Consolas, "Courier New", monospace;
  color: #d6f5e9;
}

.doc-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.doc-card {
  min-height: 170px;
  display: grid;
  align-content: start;
  gap: 8px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-2);
  text-decoration: none;
}

.doc-card strong {
  font-size: 18px;
}

.doc-card.primary {
  background: #172b2c;
  border-color: #2f6762;
}

footer {
  width: min(1180px, calc(100% - 28px));
  margin: 0 auto;
  padding: 18px 0 28px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 900px) {
  .topbar,
  .section-heading,
  footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .topbar nav {
    justify-content: flex-start;
  }

  .summary-band,
  .split,
  .branch-grid,
  .doc-grid {
    grid-template-columns: 1fr;
  }

  .status-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 520px) {
  .status-grid {
    grid-template-columns: 1fr;
  }

  .topbar nav a,
  .text-link {
    width: 100%;
  }
}