/* Vertex — precision grid, mono + geometric sans */
@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;600&family=Space+Grotesk:wght@400;500;600;700&display=swap");

:root {
  --bg: #0a0c0f;
  --grid: rgba(34, 211, 238, 0.07);
  --line: rgba(255, 255, 255, 0.08);
  --cyan: #22d3ee;
  --cyan-dim: rgba(34, 211, 238, 0.45);
  --text: #eef7f8;
  --muted: #7d8a90;
  --panel: #111418;
  --max: 1100px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Space Grotesk", system-ui, sans-serif;
  color: var(--text);
  background-color: var(--bg);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 48px 48px;
  background-position: center top;
}

a {
  color: var(--cyan);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
  text-decoration-color: var(--cyan-dim);
  text-underline-offset: 4px;
}

.shell {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 clamp(1rem, 3vw, 2rem) 3.5rem;
}

/* header strip */
.hdr {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--line);
  margin-bottom: 2rem;
}

.hdr-id {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.hdr-title {
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -0.02em;
}

.hdr-title strong {
  color: var(--cyan);
  font-weight: 700;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
}

.nav a {
  padding: 0.4rem 0.7rem;
  border: 1px solid var(--line);
  color: var(--muted);
  text-decoration: none;
}
.nav a:hover {
  color: var(--text);
  border-color: var(--cyan-dim);
}
.nav a[aria-current="page"] {
  color: var(--bg);
  background: var(--cyan);
  border-color: var(--cyan);
}

/* campus LAN — lead image below REF_DOC / design guide row */
.campus-lead {
  margin: 3rem 0 5rem;
  border: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
}

.campus-lead-label {
  margin: 0;
  padding: 0.65rem 0.75rem 0.5rem;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
}

.campus-lead img {
  width: 100%;
  height: auto;
  display: block;
}

/* home */
.hero-grid {
  display: grid;
  gap: 1.5rem;
}
@media (min-width: 820px) {
  .hero-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: stretch;
  }
}

.hero-main {
  padding: 2rem 1.5rem;
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  position: relative;
}

.hero-main::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, transparent 50%, rgba(34, 211, 238, 0.12) 50%);
  pointer-events: none;
}

.hero-main .label {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.65rem;
  color: var(--cyan);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.hero-main h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 700;
  line-height: 1.05;
  margin: 0 0 1rem;
  letter-spacing: -0.03em;
}

.hero-main p {
  margin: 0;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.65;
}

.hero-side {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.tile {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 1.35rem 1.25rem;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(17, 20, 24, 0.95), rgba(10, 12, 15, 0.6));
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.tile:hover {
  border-color: var(--cyan);
  transform: translateX(4px);
  text-decoration: none;
}

.tile h2 {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 0.5rem;
}

.tile .name {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0 0 0.35rem;
}

.tile .hint {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.45;
}

/* inner */
.page {
  padding: 1rem 0 2rem;
}

.page-top {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--line);
}

.page-top .code {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.65rem;
  color: var(--cyan);
  letter-spacing: 0.18em;
  margin-bottom: 0.75rem;
}

.page-top h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  margin: 0 0 0.75rem;
  letter-spacing: -0.02em;
}

.page-top .sum {
  margin: 0;
  max-width: 46rem;
  color: var(--muted);
  line-height: 1.65;
}

.row {
  display: grid;
  gap: 1.25rem;
  margin: 2rem 0;
}
@media (min-width: 768px) {
  .row {
    grid-template-columns: 280px 1fr;
    align-items: start;
  }
}

.row aside {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  color: var(--muted);
  line-height: 1.5;
  padding: 1rem;
  border: 1px dashed var(--cyan-dim);
  background: rgba(34, 211, 238, 0.04);
}

.row .body {
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.7;
}

.row .body p {
  margin: 0 0 1rem;
}

.spec-table-figure {
  margin: 5rem 0 6rem;
  border: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
}

.spec-table-figure .spec-table {
  margin: 0;
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  margin: 1.5rem 0;
}

.spec-table th,
.spec-table td {
  padding: 0.65rem 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--line);
}

.spec-table th {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--cyan);
  width: 28%;
}

.spec-table td {
  color: var(--text);
}

.imgs {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 0.75rem;
  margin-top: 2rem;
}

.imgs figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--panel);
}

.imgs img {
  width: 100%;
  display: block;
}

.imgs-full-link {
  display: block;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  transition: opacity 0.15s ease, box-shadow 0.15s ease;
}

.imgs-full-link:hover img {
  opacity: 0.92;
}

.imgs-full-link:focus {
  outline: none;
}

.imgs-full-link:focus-visible {
  box-shadow: 0 0 0 2px var(--bg), 0 0 0 4px var(--cyan);
}

.imgs figcaption {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.65rem;
  padding: 0.4rem 0.5rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.imgs-figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
}

.imgs-figure .imgs {
  margin-top: 0;
  padding: 0.75rem 0.75rem 0.85rem;
}

.link-panel {
  margin: 5rem 0 0;
  border: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
}

.link-panel-body {
  padding: 1rem 1.25rem 1.35rem;
}

.link-panel-body p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.65;
}

.ft {
  margin-top: 2.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.65rem;
  color: var(--muted);
  text-align: center;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}