:root {
  --white: #ffffff;
  --black: #111315;
  --blue: #4b9cd3;
  --blue-dark: #236a9d;
  --line: #d9e0e5;
  --muted: #65717a;
  --soft: #f5f8fa;
  --display: "Barlow Condensed", sans-serif;
  --body: "Space Grotesk", sans-serif;
  --mono: "IBM Plex Mono", monospace;
}

* { box-sizing: border-box; }

html { background: var(--white); }

body {
  margin: 0;
  color: var(--black);
  background-color: var(--white);
  font-family: var(--body);
  -webkit-font-smoothing: antialiased;
}

.site-shell {
  display: flex;
  flex-direction: column;
  width: min(100% - 40px, 760px);
  min-height: 100vh;
  margin: 0 auto;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 74px;
  border-bottom: 1px solid var(--black);
}

.wordmark {
  display: flex;
  align-items: baseline;
  gap: 10px;
  color: var(--black);
  text-decoration: none;
}

.wordmark-code,
.wordmark-name,
.status-dot,
.eyebrow,
.section-index,
.strip-label,
.footer-coordinates,
.resource-number,
.note-detail {
  font-family: var(--mono);
}

.wordmark-code { font-size: 14px; font-weight: 500; letter-spacing: 0.04em; }
.wordmark-name { color: var(--blue-dark); font-size: 14px; font-weight: 500; letter-spacing: 0.16em; }

.topbar-status {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.06em;
}

.status-dot {
  width: 7px;
  height: 7px;
  border: 1px solid var(--blue-dark);
  background: var(--blue);
}

main { flex: 1; }

.intro { padding: 64px 0 42px; }

.eyebrow {
  display: flex;
  justify-content: space-between;
  color: var(--blue-dark);
  font-size: 10px;
  letter-spacing: 0.1em;
}

h1 {
  margin: 20px 0 14px;
  font-family: var(--display);
  font-size: clamp(48px, 10vw, 84px);
  font-weight: 700;
  letter-spacing: 0.015em;
  line-height: 0.92;
}

h1 span { color: var(--blue); font-weight: 500; }

.intro-copy {
  max-width: 460px;
  margin: 0;
  color: #424b51;
  font-size: 15px;
  line-height: 1.55;
}

.intro-rule { width: 56px; height: 4px; margin-top: 28px; background: var(--blue); }
.announcement { margin: 24px 0 0; padding: 10px 12px; color: var(--text-on-accent, #fff); background: var(--blue-dark); font-family: var(--mono); font-size: 11px; }

.section-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--black);
}

h2 {
  margin: 0;
  font-family: var(--display);
  font-size: 24px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.section-index { color: var(--muted); font-size: 10px; }

.resource-list { border-bottom: 1px solid var(--black); }

.resource-link {
  display: grid;
  grid-template-columns: 36px 34px 1fr 24px;
  align-items: center;
  gap: 8px;
  min-height: 98px;
  padding: 18px 0;
  color: var(--black);
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  transition: padding 160ms ease, color 160ms ease, background-color 160ms ease;
}

.resource-link:last-child { border-bottom: 0; }
.resource-link:hover, .resource-link:focus-visible { padding-right: 10px; padding-left: 10px; color: var(--blue-dark); background: var(--soft); outline: none; }
html[data-button-style="solid"] .resource-link { margin: 8px 0; padding: 17px 12px; border: 1px solid var(--blue-dark); background: var(--blue-dark); color: #fff; }
html[data-button-style="solid"] .resource-link + .resource-link { border-top: 0; }
html[data-button-style="solid"] .resource-link .resource-number, html[data-button-style="solid"] .resource-link .resource-description { color: #e5f2fb; }

.resource-number { align-self: start; padding-top: 4px; color: var(--muted); font-size: 10px; }
.resource-icon { display: grid; width: 26px; height: 26px; place-items: center; color: var(--blue-dark); border: 1px solid var(--blue); font-family: var(--mono); font-size: 15px; }
.resource-copy { display: flex; flex-direction: column; gap: 4px; }
.resource-title { font-family: var(--display); font-size: 27px; font-weight: 600; letter-spacing: 0.03em; text-transform: uppercase; }
.resource-description { color: var(--muted); font-size: 12px; line-height: 1.45; }
.resource-arrow { color: var(--blue-dark); font-size: 22px; text-align: right; }

.add-link-note { display: flex; align-items: center; gap: 9px; min-height: 52px; color: var(--muted); font-family: var(--mono); font-size: 10px; letter-spacing: 0.03em; }
.note-mark { color: var(--blue-dark); font-size: 16px; }
.note-detail { margin-left: auto; color: #8a959c; font-size: 9px; }

.system-strip { display: grid; grid-template-columns: 1fr 1fr 1fr; margin: 54px 0 64px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.system-strip > div { display: flex; flex-direction: column; gap: 6px; padding: 14px 12px 14px 0; border-right: 1px solid var(--line); }
.system-strip > div:not(:first-child) { padding-left: 14px; }
.system-strip > div:last-child { border-right: 0; }
.strip-label { color: var(--muted); font-size: 9px; letter-spacing: 0.09em; }
.system-strip strong { font-family: var(--mono); font-size: 11px; font-weight: 500; }

.footer { display: flex; align-items: center; justify-content: space-between; min-height: 70px; border-top: 1px solid var(--black); }
.footer-mark { display: flex; gap: 9px; align-items: baseline; font-family: var(--mono); font-size: 10px; }
.footer-mark strong { font-weight: 500; }
.footer-mark span { color: var(--blue-dark); letter-spacing: 0.1em; }
.footer p { margin: 0; color: var(--muted); font-size: 10px; }
.footer-coordinates { color: var(--muted); font-size: 9px; }

@media (max-width: 560px) {
  .site-shell { width: min(100% - 28px, 760px); }
  .topbar { min-height: 62px; }
  .topbar-status { font-size: 9px; }
  .intro { padding: 50px 0 36px; }
  .eyebrow { font-size: 9px; }
  h1 { font-size: clamp(46px, 15vw, 72px); }
  .resource-link { grid-template-columns: 26px 30px 1fr 18px; gap: 6px; min-height: 92px; }
  .resource-title { font-size: 24px; }
  .resource-description { max-width: 220px; font-size: 11px; }
  .note-detail { display: none; }
  .system-strip { margin: 42px 0 48px; }
  .system-strip > div, .system-strip > div:not(:first-child) { padding: 12px 7px 12px 0; }
  .system-strip > div:not(:first-child) { padding-left: 7px; }
  .footer { align-items: flex-start; flex-wrap: wrap; gap: 5px 16px; padding: 15px 0; }
  .footer p { order: 3; width: 100%; }
}