:root {
  --bg: #0f1117;
  --surface: #161d29;
  --surface-2: #111722;
  --line: #2a3549;
  --ink: #e5edf8;
  --muted: #98a8c2;
  --accent: #57c7ff;
  --accent-2: #8f7bff;
  --warn: #f4c36a;
  --ok: #4dd39a;
  --alert: #ff8c8c;
  --max: 1120px;
  --radius-s: 8px;
  --radius-m: 14px;
  --font-body: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-display: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: radial-gradient(circle at 85% 5%, #1b2740 0%, var(--bg) 38%);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.65;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

a:hover {
  text-decoration: none;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--accent-2);
  outline-offset: 2px;
  border-radius: 6px;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--surface);
  color: var(--ink);
  padding: 0.65rem 0.9rem;
  z-index: 999;
}

.skip-link:focus {
  left: 0.75rem;
  top: 0.75rem;
}

.container {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(15, 17, 23, 0.95);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(7px);
}

.header-row {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 0.95rem;
}

.brand span {
  white-space: nowrap;
}

.nav-toggle {
  background: var(--surface);
  border: 1px solid var(--line);
  color: var(--ink);
  border-radius: var(--radius-s);
  padding: 0.5rem 0.8rem;
  font: inherit;
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.site-nav a {
  display: block;
  color: var(--ink);
  text-decoration: none;
  padding: 0.5rem 0.65rem;
  border-radius: 7px;
}

.site-nav a:hover,
.site-nav a[aria-current='page'] {
  background: #1b2332;
}

body.js-enabled [data-collapsible] {
  display: none;
  position: absolute;
  top: 68px;
  right: 1rem;
  width: min(290px, calc(100vw - 2rem));
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  padding: 0.5rem;
}

body.js-enabled [data-collapsible].open {
  display: block;
}

.hero {
  display: grid;
  gap: 1.3rem;
  align-items: start;
  padding-block: 2.2rem 1.6rem;
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  line-height: 1.2;
  margin: 0 0 0.8rem;
}

h1 {
  font-size: clamp(1.6rem, 3.8vw, 2.55rem);
  max-width: 23ch;
}

h2 {
  font-size: clamp(1.2rem, 2.5vw, 1.6rem);
}

.lede,
.article .lede {
  max-width: 70ch;
  color: var(--muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.1rem;
}

.btn {
  display: inline-block;
  border-radius: 9px;
  padding: 0.7rem 1rem;
  text-decoration: none;
  font-weight: 600;
}

.btn-primary {
  background: var(--accent);
  color: #001726;
}

.btn-ghost {
  border: 1px solid var(--line);
  color: var(--ink);
  background: var(--surface);
}

.signal-board {
  background: linear-gradient(160deg, #121c2b 0%, #111722 100%);
  border: 1px solid #2f3e58;
  border-radius: 16px;
  padding: 1rem;
  position: relative;
  overflow: hidden;
}

.signal-board::after {
  content: '';
  position: absolute;
  inset: -45% 0 auto 0;
  height: 40%;
  background: linear-gradient(180deg, rgba(87, 199, 255, 0), rgba(87, 199, 255, 0.22), rgba(87, 199, 255, 0));
  animation: signal-scan 5.2s linear infinite;
}

.signal-title {
  margin: 0 0 0.8rem;
  font-family: var(--font-display);
  color: var(--accent);
}

.thread-lines p {
  margin: 0.45rem 0;
  font-family: var(--font-display);
  font-size: 0.92rem;
  color: #d0e6f8;
}

.thread-lines span {
  color: var(--accent-2);
}

.section {
  margin-block: 1.8rem;
}

.thread-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: var(--surface-2);
}

.thread-item {
  display: grid;
  grid-template-columns: 78px 1fr;
  gap: 0.7rem;
  padding: 1rem;
  border-bottom: 1px solid var(--line);
}

.thread-item:last-child {
  border-bottom: 0;
}

.thread-time {
  color: var(--accent-2);
  font-family: var(--font-display);
  font-size: 0.86rem;
  padding-top: 0.2rem;
}

.thread-item p {
  margin: 0.35rem 0 0;
  color: var(--muted);
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 620px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

caption {
  text-align: left;
  padding: 0.9rem 1rem;
  color: var(--muted);
}

th,
td {
  text-align: left;
  padding: 0.8rem 1rem;
  border-top: 1px solid var(--line);
  vertical-align: top;
}

thead th {
  color: #cfe4f8;
  font-family: var(--font-display);
  font-size: 0.92rem;
  border-top: 0;
}

.status-pill {
  display: inline-block;
  border-radius: 999px;
  font-size: 0.82rem;
  padding: 0.2rem 0.55rem;
}

.status-pill.ok {
  color: #092718;
  background: var(--ok);
}

.status-pill.warn {
  color: #2f2200;
  background: var(--warn);
}

.status-pill.alert {
  color: #2e0606;
  background: var(--alert);
}

.diagram {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: var(--surface-2);
  padding: 0.85rem;
}

figcaption {
  margin-top: 0.7rem;
  color: var(--muted);
  font-size: 0.95rem;
}

details {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.7rem 0.85rem;
  margin-bottom: 0.65rem;
  background: var(--surface-2);
}

summary {
  cursor: pointer;
  font-weight: 600;
}

details p {
  color: var(--muted);
  margin: 0.55rem 0 0;
}

.breadcrumb {
  font-size: 0.92rem;
  display: flex;
  gap: 0.55rem;
  align-items: center;
  margin-top: 1rem;
  color: var(--muted);
}

.article {
  padding-block: 1rem 1.4rem;
}

.callout {
  border-left: 4px solid var(--accent);
  background: #121c2a;
  border-radius: 0 10px 10px 0;
  padding: 0.85rem 1rem;
  margin: 1rem 0 1.3rem;
}

.steps {
  padding-left: 1.15rem;
}

.steps li {
  margin-bottom: 0.6rem;
}

.log-template {
  background: #0d1420;
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  padding: 0.85rem;
  color: #d0def0;
  overflow-x: auto;
}

.related-links {
  margin: 0;
  padding-left: 1.15rem;
}

.related-links li {
  margin-bottom: 0.45rem;
}

.checklist {
  list-style: none;
  margin: 0;
  padding: 0;
}

.checklist li {
  display: flex;
  gap: 0.6rem;
  align-items: flex-start;
  border-bottom: 1px solid var(--line);
  padding: 0.72rem 0;
}

.checklist li:last-child {
  border-bottom: 0;
}

.checklist span {
  color: var(--ok);
  font-weight: 700;
  font-family: var(--font-display);
}

.site-footer {
  border-top: 1px solid var(--line);
  margin-top: 2rem;
  padding: 1.25rem 0 2rem;
  background: #0f151f;
}

.footer-grid {
  display: grid;
  gap: 0.35rem;
  color: var(--muted);
  font-size: 0.95rem;
}

@media (min-width: 860px) {
  .nav-toggle {
    display: none;
  }

  .site-nav ul {
    flex-direction: row;
    gap: 0.35rem;
  }

  .site-nav,
  body.js-enabled .site-nav {
    display: block !important;
    position: static;
    width: auto;
    border: 0;
    padding: 0;
    background: transparent;
  }

  .hero {
    grid-template-columns: 1.25fr 0.9fr;
    gap: 1.9rem;
    padding-block: 2.8rem 2rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .signal-board::after {
    animation: none;
  }
}

@keyframes signal-scan {
  0% { transform: translateY(-30%); }
  100% { transform: translateY(240%); }
}