/* Aster Vale Technology — design system
   navy #1B2A41 · teal #3E7C7B · warm grey #D8D4CE · off-white #FAF9F7 */

:root {
  --navy: #1B2A41;
  --navy-soft: #2C3E58;
  --teal: #3E7C7B;
  --teal-dark: #326463;
  --warm-grey: #D8D4CE;
  --warm-grey-lt: #EFEDE9;
  --off-white: #FAF9F7;
  --text: #23282F;
  --text-muted: #5C646F;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--off-white);
  color: var(--text);
  font: 16px/1.7 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 760px; margin: 0 auto; padding: 0 24px; }

/* ---------- header ---------- */

.topbar {
  background: var(--navy);
  color: #fff;
  padding: 14px 0;
}

.topbar .wrap {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-right: auto;
}

.brand svg { display: block; flex: none; }

.topbar nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 18px;
}

.topbar nav a {
  color: #C7D0DC;
  text-decoration: none;
  font-size: 14px;
  padding: 2px 0;
  border-bottom: 2px solid transparent;
}

.topbar nav a:hover { color: #fff; }
.topbar nav a[aria-current="page"] { color: #fff; border-bottom-color: var(--teal); }

/* ---------- hero ---------- */

.hero {
  padding: 56px 0 44px;
  border-bottom: 1px solid var(--warm-grey);
}

.hero h1 {
  font-size: 2.25rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--navy);
  margin: 0 0 18px;
}

.hero p {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 60ch;
  margin: 0 0 26px;
}

.btn-row { display: flex; flex-wrap: wrap; gap: 12px; }

.btn {
  display: inline-block;
  padding: 10px 20px;
  border-radius: 3px;
  font-size: 15px;
  text-decoration: none;
  border: 1px solid var(--teal);
}

.btn-solid { background: var(--teal); color: #fff; }
.btn-solid:hover { background: var(--teal-dark); border-color: var(--teal-dark); }
.btn-ghost { color: var(--teal-dark); background: transparent; }
.btn-ghost:hover { background: var(--warm-grey-lt); }

/* ---------- page body ---------- */

main { padding-bottom: 24px; }

.page-head {
  padding: 44px 0 8px;
  border-bottom: 1px solid var(--warm-grey);
  margin-bottom: 32px;
}

.page-head h1 {
  font-size: 1.85rem;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--navy);
  margin: 0 0 12px;
}

.page-head p {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin: 0 0 24px;
  max-width: 62ch;
}

h2 {
  font-size: 1.25rem;
  color: var(--navy);
  margin: 40px 0 6px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--teal);
  display: inline-block;
}

h3 { font-size: 1.02rem; color: var(--navy); margin: 26px 0 6px; }

p { margin: 0 0 16px; }

a { color: var(--teal-dark); }

ul, ol { padding-left: 22px; margin: 0 0 16px; }
li { margin: 7px 0; }

code {
  background: var(--warm-grey-lt);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 0.9em;
}

/* ---------- cards ---------- */

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 18px;
  margin: 40px 0;
}

.card {
  border: 1px solid var(--warm-grey);
  border-top: 3px solid var(--teal);
  background: #fff;
  padding: 20px;
}

.card h3 { margin: 0 0 8px; font-size: 1rem; }
.card p { margin: 0; font-size: 14px; color: var(--text-muted); }

/* ---------- tables ---------- */

.table-scroll { overflow-x: auto; margin: 20px 0; }

table { width: 100%; border-collapse: collapse; font-size: 15px; }

th, td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--warm-grey);
  vertical-align: top;
}

th { color: var(--navy); font-weight: 600; }

/* ---------- notices ---------- */

.notice {
  background: var(--warm-grey-lt);
  border-left: 3px solid var(--teal);
  padding: 14px 18px;
  margin: 0 0 4px;
  font-size: 13px;
  color: var(--text-muted);
}

.debrief {
  background: #fff;
  border: 1px solid var(--warm-grey);
  border-left: 4px solid var(--teal);
  padding: 28px 30px;
  margin: 32px 0;
}

.debrief h1 {
  margin: 0 0 8px;
  font-size: 1.6rem;
  color: var(--navy);
  line-height: 1.25;
}

.debrief .kicker {
  display: inline-block;
  background: var(--teal);
  color: #fff;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: 3px;
  margin-bottom: 14px;
}

.token-line {
  font-size: 13px;
  color: var(--text-muted);
  border-top: 1px solid var(--warm-grey);
  margin-top: 22px;
  padding-top: 14px;
}

/* ---------- diagram ---------- */

.diagram {
  border: 1px solid var(--warm-grey);
  background: #fff;
  padding: 22px;
  margin: 26px 0;
  overflow-x: auto;
}

.diagram svg { display: block; margin: 0 auto; max-width: 100%; height: auto; }

/* ---------- related ---------- */

.related {
  margin-top: 48px;
  padding-top: 22px;
  border-top: 1px solid var(--warm-grey);
}

.related h2 {
  font-size: 0.95rem;
  border: 0;
  padding: 0;
  margin: 0 0 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.related ul { margin: 0; }

/* ---------- footer ---------- */

.sitefoot {
  background: var(--navy);
  color: #A8B4C4;
  margin-top: 64px;
  padding: 32px 0;
  font-size: 13px;
}

.sitefoot .brand { margin-bottom: 12px; font-size: 14px; }

.sitefoot p { margin: 0 0 8px; max-width: 68ch; }

.sitefoot a { color: #C7D0DC; }

.exercise-note {
  border-top: 1px solid var(--navy-soft);
  margin-top: 16px;
  padding-top: 14px;
  color: #8C99AB;
}

@media (max-width: 560px) {
  .hero h1 { font-size: 1.8rem; }
  .hero { padding: 40px 0 32px; }
  .debrief { padding: 22px 20px; }
}