:root {
  color-scheme: light;
  --ink: #161616;
  --muted: #525252;
  --quiet: #6f6f6f;
  --line: #e0e0e0;
  --surface: #f4f4f4;
  --surface-hover: #e8e8e8;
  --blue: #0f62fe;
  --blue-hover: #0043ce;
  --blue-soft: #edf5ff;
  --green: #198038;
  --green-soft: #defbe6;
  --dark: #161616;
  --max: 1248px;
  font-family: "IBM Plex Sans", Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: #fff; color: var(--ink); line-height: 1.5; }
a { color: var(--blue); text-decoration: none; }
a:hover { color: var(--blue-hover); text-decoration: underline; }
button, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--blue); outline-offset: 3px; }

.skip-link { position: fixed; left: 8px; top: -80px; z-index: 100; padding: 12px 16px; color: #fff; background: var(--blue); }
.skip-link:focus { top: 8px; }

.masthead { position: sticky; top: 0; z-index: 20; height: 56px; background: var(--dark); color: #fff; border-bottom: 1px solid #393939; }
.nav-shell { width: min(100%, var(--max)); height: 100%; margin: 0 auto; display: flex; align-items: center; }
.brand { height: 56px; display: flex; align-items: center; gap: 12px; padding: 0 24px; color: #fff; font-weight: 600; letter-spacing: .01em; }
.brand:hover { color: #fff; text-decoration: none; background: #262626; }
.brand-mark { width: 28px; height: 28px; display: grid; place-items: center; background: var(--blue); font-size: 11px; font-weight: 700; }
.nav-links { margin-left: auto; display: flex; height: 100%; }
.nav-links a { height: 56px; display: flex; align-items: center; padding: 0 18px; color: #c6c6c6; font-size: 14px; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: #fff; text-decoration: none; background: #262626; }
.nav-links a[aria-current="page"] { box-shadow: inset 0 -3px 0 var(--blue); }
.menu-button { display: none; margin-left: auto; width: 56px; height: 56px; border: 0; color: #fff; background: transparent; font-size: 24px; cursor: pointer; }

.container { width: min(100%, var(--max)); margin: 0 auto; padding-inline: 24px; }
.hero { min-height: 520px; display: grid; grid-template-columns: 7fr 5fr; }
.hero-copy { padding: 88px 64px 80px 24px; }
.eyebrow { margin: 0 0 18px; color: var(--blue); font-family: ui-monospace, "SFMono-Regular", Consolas, monospace; font-size: 13px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; }
h1 { margin: 0; max-width: 780px; font-size: clamp(44px, 6vw, 76px); font-weight: 300; line-height: 1.04; letter-spacing: -.035em; text-wrap: balance; }
.hero-lead { max-width: 680px; margin: 28px 0 0; color: var(--muted); font-size: 20px; line-height: 1.55; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 1px; margin-top: 40px; }
.button { min-height: 52px; display: inline-flex; align-items: center; justify-content: space-between; gap: 38px; padding: 0 18px; border: 1px solid var(--blue); font-size: 15px; font-weight: 500; }
.button.primary { min-width: 230px; color: #fff; background: var(--blue); }
.button.primary:hover { color: #fff; background: var(--blue-hover); text-decoration: none; }
.button.secondary { color: var(--blue); background: #fff; }
.button.secondary:hover { background: var(--blue-soft); text-decoration: none; }
.hero-panel { position: relative; overflow: hidden; min-height: 520px; padding: 48px; background: var(--dark); color: #fff; display: flex; flex-direction: column; justify-content: flex-end; }
.hero-panel::before { content: ""; position: absolute; inset: 0; opacity: .34; background-image: linear-gradient(#393939 1px, transparent 1px), linear-gradient(90deg, #393939 1px, transparent 1px); background-size: 40px 40px; }
.hero-panel::after { content: ""; position: absolute; width: 300px; height: 300px; right: -70px; top: -70px; border: 1px solid #78a9ff; border-radius: 50%; box-shadow: 0 0 0 55px #0f62fe24, 0 0 0 110px #0f62fe12; }
.signal { position: relative; z-index: 1; }
.signal-label { color: #a8a8a8; font-family: ui-monospace, "SFMono-Regular", Consolas, monospace; font-size: 12px; letter-spacing: .08em; text-transform: uppercase; }
.signal-status { display: flex; align-items: center; gap: 10px; margin-top: 12px; font-size: 25px; font-weight: 300; }
.signal-dot { width: 12px; height: 12px; border-radius: 50%; background: #42be65; box-shadow: 0 0 0 5px #42be6526; }
.signal-meta { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; margin-top: 36px; background: #393939; }
.signal-item { min-height: 96px; padding: 16px; background: #262626; }
.signal-item small { display: block; color: #a8a8a8; font-size: 12px; }
.signal-item strong { display: block; margin-top: 9px; font-family: ui-monospace, "SFMono-Regular", Consolas, monospace; font-size: 16px; font-weight: 400; }

.band { border-top: 1px solid var(--line); }
.band.soft { background: var(--surface); }
.section { padding-block: 72px; }
.section-head { display: grid; grid-template-columns: 1fr 2fr; gap: 32px; margin-bottom: 40px; }
.section-index { color: var(--blue); font-family: ui-monospace, "SFMono-Regular", Consolas, monospace; font-size: 13px; }
h2 { margin: 0; max-width: 800px; font-size: clamp(32px, 4.5vw, 52px); font-weight: 300; line-height: 1.12; letter-spacing: -.02em; text-wrap: balance; }
.section-intro { max-width: 700px; margin: 18px 0 0; color: var(--muted); font-size: 18px; }

.tile-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.tile { min-height: 260px; padding: 28px; background: #fff; display: flex; flex-direction: column; }
.soft .tile { background: var(--surface); }
.tile:hover { background: var(--surface-hover); }
.tile-kicker { color: var(--blue); font-family: ui-monospace, "SFMono-Regular", Consolas, monospace; font-size: 12px; letter-spacing: .06em; text-transform: uppercase; }
.tile h3 { margin: 24px 0 12px; font-size: 23px; font-weight: 400; line-height: 1.25; }
.tile p { margin: 0; color: var(--muted); font-size: 15px; line-height: 1.6; }
.tile-link { margin-top: auto; padding-top: 28px; font-weight: 500; }

.status-strip { display: grid; grid-template-columns: 2fr 1fr 1fr; background: var(--line); gap: 1px; border: 1px solid var(--line); }
.status-cell { min-height: 136px; padding: 24px; background: #fff; }
.status-cell small { display: block; color: var(--quiet); font-size: 12px; letter-spacing: .03em; }
.status-cell strong { display: block; margin-top: 16px; font-size: 22px; font-weight: 400; }
.status-good { display: inline-flex !important; align-items: center; gap: 10px; color: var(--green); }
.status-good::before { content: ""; width: 10px; height: 10px; border-radius: 50%; background: var(--green); }

.article-list { border-top: 1px solid var(--line); }
.article-row { display: grid; grid-template-columns: 100px 1fr 36px; gap: 24px; align-items: start; min-height: 130px; padding: 28px 0; border-bottom: 1px solid var(--line); color: var(--ink); }
.article-row:hover { color: var(--ink); background: linear-gradient(90deg, transparent 0, var(--surface) 8%, var(--surface) 92%, transparent 100%); text-decoration: none; }
.article-row time { color: var(--quiet); font-family: ui-monospace, "SFMono-Regular", Consolas, monospace; font-size: 12px; }
.article-row h3 { margin: 0 0 8px; font-size: 21px; font-weight: 400; }
.article-row p { margin: 0; color: var(--muted); }
.article-arrow { color: var(--blue); font-size: 24px; }

.page-hero { padding-block: 72px 64px; border-bottom: 1px solid var(--line); }
.page-hero h1 { max-width: 920px; }
.page-lead { max-width: 760px; margin: 24px 0 0; color: var(--muted); font-size: 20px; }
.content-layout { display: grid; grid-template-columns: 280px minmax(0, 760px); gap: 64px; padding-block: 64px 96px; }
.side-nav { align-self: start; position: sticky; top: 80px; border-top: 1px solid var(--line); }
.side-nav a { display: block; padding: 14px 0; border-bottom: 1px solid var(--line); color: var(--muted); font-size: 14px; }
.side-nav a:hover { color: var(--blue); text-decoration: none; }
.prose h2 { margin: 0 0 20px; font-size: 34px; }
.prose h3 { margin: 48px 0 12px; font-size: 23px; font-weight: 400; }
.prose p, .prose li { color: var(--muted); font-size: 17px; line-height: 1.75; }
.prose ul, .prose ol { padding-left: 24px; }
.prose .notice { margin: 32px 0; padding: 20px 24px; border-left: 4px solid var(--blue); background: var(--blue-soft); color: var(--ink); }
.check-list { list-style: none; padding: 0 !important; }
.check-list li { position: relative; padding: 18px 16px 18px 48px; border-top: 1px solid var(--line); }
.check-list li:last-child { border-bottom: 1px solid var(--line); }
.check-list li::before { content: "✓"; position: absolute; left: 16px; color: var(--green); font-weight: 600; }
.faq details { border-top: 1px solid var(--line); }
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; padding: 22px 40px 22px 0; font-size: 18px; font-weight: 500; }
.faq details p { margin-top: -6px; padding: 0 32px 22px 0; }

.footer { color: #c6c6c6; background: var(--dark); }
.footer-grid { min-height: 250px; display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 48px; padding-block: 48px; }
.footer-brand { color: #fff; font-size: 24px; font-weight: 300; }
.footer-note { max-width: 470px; color: #a8a8a8; font-size: 14px; }
.footer h3 { margin: 0 0 14px; color: #fff; font-size: 13px; font-weight: 500; letter-spacing: .05em; text-transform: uppercase; }
.footer a { display: block; padding: 6px 0; color: #c6c6c6; font-size: 14px; }
.footer a:hover { color: #fff; }
.footer-bottom { padding: 20px 0; border-top: 1px solid #393939; color: #8d8d8d; font-size: 12px; }

.diagnostic-panel { border: 1px solid var(--line); background: var(--surface); }
.diagnostic-head { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 24px; border-bottom: 1px solid var(--line); background: #fff; }
.diagnostic-head h3 { margin: 0; font-size: 22px; font-weight: 400; }
.diagnostic-button { min-height: 48px; padding: 0 24px; border: 0; color: #fff; background: var(--blue); font: inherit; font-weight: 500; cursor: pointer; }
.diagnostic-button:hover { background: var(--blue-hover); }
.diagnostic-button:disabled { cursor: wait; background: #8d8d8d; }
.diagnostic-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line); }
.diagnostic-cell { min-height: 120px; padding: 22px; background: #fff; }
.diagnostic-cell small { display: block; color: var(--quiet); font-size: 12px; letter-spacing: .03em; }
.diagnostic-cell strong { display: block; margin-top: 14px; font-family: ui-monospace, "SFMono-Regular", Consolas, monospace; font-size: 17px; font-weight: 400; }
.diagnostic-foot { padding: 18px 24px; color: var(--muted); font-size: 13px; }
.timeline { border-top: 1px solid var(--line); }
.timeline-item { display: grid; grid-template-columns: 150px 1fr; gap: 32px; padding: 30px 0; border-bottom: 1px solid var(--line); }
.timeline-item time { color: var(--quiet); font-family: ui-monospace, "SFMono-Regular", Consolas, monospace; font-size: 12px; }
.timeline-item h3 { margin: 0 0 8px; font-size: 21px; font-weight: 400; }
.timeline-item p { margin: 0; color: var(--muted); }
.meta-table { border-top: 1px solid var(--line); }
.meta-row { display: grid; grid-template-columns: 220px 1fr; gap: 24px; padding: 17px 0; border-bottom: 1px solid var(--line); }
.meta-row span:first-child { color: var(--quiet); }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; }
  .hero-copy { padding: 64px 24px; }
  .hero-panel { min-height: 380px; }
  .tile-grid { grid-template-columns: 1fr 1fr; }
  .status-strip { grid-template-columns: 1fr 1fr; }
  .status-cell:first-child { grid-column: 1 / -1; }
  .content-layout { grid-template-columns: 1fr; gap: 40px; }
  .side-nav { position: static; display: flex; flex-wrap: wrap; gap: 20px; border: 0; }
  .side-nav a { border: 0; padding: 0; }
}

@media (max-width: 680px) {
  .container { padding-inline: 16px; }
  .nav-shell { padding-left: 0; }
  .brand { padding-inline: 16px; }
  .menu-button { display: block; }
  .nav-links { position: fixed; inset: 56px 0 auto; display: none; height: auto; flex-direction: column; background: var(--dark); border-top: 1px solid #393939; }
  .nav-links.open { display: flex; }
  .nav-links a { padding-inline: 20px; border-bottom: 1px solid #393939; }
  h1 { font-size: 43px; }
  .hero-copy { padding: 48px 16px; }
  .hero-panel { min-height: 340px; padding: 32px 24px; }
  .section { padding-block: 52px; }
  .section-head { grid-template-columns: 1fr; gap: 12px; }
  .tile-grid, .status-strip { grid-template-columns: 1fr; }
  .status-cell:first-child { grid-column: auto; }
  .article-row { grid-template-columns: 1fr 28px; gap: 10px; }
  .article-row time { grid-column: 1 / -1; }
  .page-hero { padding-block: 52px 44px; }
  .content-layout { padding-block: 44px 72px; }
  .footer-grid { grid-template-columns: 1fr; min-height: 0; }
  .diagnostic-head { align-items: stretch; flex-direction: column; }
  .diagnostic-grid { grid-template-columns: 1fr; }
  .timeline-item, .meta-row { grid-template-columns: 1fr; gap: 8px; }
}

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