@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,500;9..144,600&family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --paper:        #16130e;
  --paper-tint:   #1d1912;
  --paper-deep:   #252017;
  --ink:          #ece6d7;
  --ink-soft:     #c7bfab;
  --ink-dim:      #94897a;
  --ink-faint:    #6d655a;
  --rule:         #2d2820;
  --rule-strong:  #3d382e;
  --accent:       #e09560;
  --accent-soft:  #2d2218;
  --accent-ink:   #f0b080;
  --ok:           #a8c48a;
  --warn:         #d9a45e;
  --danger:       #d9746c;
  --code-bg:      #0c0a07;
  --code-fg:      #ece6d7;

  --serif: 'Fraunces', 'Source Serif Pro', Georgia, 'Times New Roman', serif;
  --sans:  'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, system-ui, sans-serif;
  --mono:  'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;

  --sidebar-w: 260px;
  --content-w: 720px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.7;
  color: var(--ink);
  background: var(--paper);
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  grid-template-rows: 1fr auto;
  min-height: 100vh;
}

/* ---------- Sidebar (was .topbar) ---------- */

.topbar {
  grid-column: 1;
  grid-row: 1 / span 2;
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  overflow-y: auto;
  background: var(--paper-tint);
  border-right: 1px solid var(--rule);
  padding: 2.25rem 1.25rem 2rem;
  scrollbar-width: thin;
  scrollbar-color: var(--rule-strong) transparent;
}
.topbar::-webkit-scrollbar { width: 6px; }
.topbar::-webkit-scrollbar-thumb { background: var(--rule-strong); border-radius: 3px; }

.topbar-inner {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: .35rem;
  text-decoration: none;
  color: var(--ink);
  padding: 0 .5rem;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 1.25rem;
  margin-bottom: .25rem;
}
.brand > span:nth-child(2) {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.15rem;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.brand-logo {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 500;
  font-size: 1.5rem;
  color: var(--accent);
  line-height: 1;
  margin-bottom: .35rem;
  letter-spacing: -0.02em;
}
.brand-logo::before { content: '— '; color: var(--accent); font-style: normal; }

.brand-version {
  font-family: var(--mono);
  font-size: .72rem;
  color: var(--ink-faint);
  letter-spacing: 0.02em;
  margin-top: .15rem;
}

/* Grouped nav rendered by nav.js */
.nav {
  display: flex;
  flex-direction: column;
  gap: 0;
}
.nav-section {
  font-family: var(--sans);
  font-size: .7rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
  padding: 1.1rem .75rem .4rem;
}
.nav-section:first-child { padding-top: .25rem; }

.nav a {
  display: block;
  padding: .3rem .85rem .3rem .9rem;
  color: var(--ink-soft);
  text-decoration: none;
  font-size: .93rem;
  line-height: 1.4;
  border-left: 2px solid transparent;
  transition: color .15s ease, background .15s ease;
}
.nav a:hover {
  color: var(--ink);
  background: rgba(255,255,255,0.03);
}
.nav a.active {
  color: var(--accent-ink);
  background: var(--accent-soft);
  border-left-color: var(--accent);
  font-weight: 500;
}

.nav-cta {
  padding: 0 .75rem;
  margin-top: .5rem;
  border-top: 1px solid var(--rule);
  padding-top: 1.25rem;
}
.nav-ext {
  font-family: var(--sans);
  font-size: .85rem;
  color: var(--ink-dim);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: .3rem;
}
.nav-ext:hover { color: var(--accent); }

/* ---------- Main content column ---------- */

main,
section.container,
section.container-narrow {
  grid-column: 2;
  grid-row: 1;
  max-width: var(--content-w);
  width: 100%;
  margin: 0;
  padding: 4rem 3.5rem 5rem 3.5rem;
  justify-self: start;
}

main.container,
section.container {
  max-width: 880px;
}

/* ---------- Typography ---------- */

h1, h2, h3, h4 {
  font-family: var(--serif);
  color: var(--ink);
  font-weight: 500;
  letter-spacing: -0.01em;
}

h1 {
  font-size: clamp(2rem, 3.8vw, 2.75rem);
  line-height: 1.12;
  margin: 0 0 1rem 0;
  font-weight: 500;
  font-variation-settings: "opsz" 144;
}

h2 {
  font-size: 1.6rem;
  line-height: 1.25;
  margin: 3.5rem 0 1rem;
  padding-top: 2.25rem;
  border-top: 1px solid var(--rule);
  font-variation-settings: "opsz" 48;
}

h3 {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 1.02rem;
  line-height: 1.4;
  margin: 2rem 0 .5rem;
  letter-spacing: 0;
  color: var(--ink);
}

p, ul, ol { margin: 0 0 1.1rem; }
ul, ol { padding-left: 1.4rem; }
li { margin-bottom: .35rem; }
li > ul, li > ol { margin-top: .35rem; margin-bottom: .35rem; }

a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  text-decoration-color: color-mix(in srgb, var(--accent) 35%, transparent);
}
a:hover { text-decoration-color: var(--accent); }

strong { font-weight: 600; color: var(--ink); }
em { font-style: italic; }

/* Lead paragraph */
.lead {
  font-family: var(--serif);
  font-size: 1.18rem;
  line-height: 1.55;
  color: var(--ink-soft) !important;
  font-style: italic;
  border-left: 2px solid var(--accent);
  padding: .15rem 0 .15rem 1.15rem;
  margin: 1.5rem 0 2.75rem;
  font-weight: 400;
}

/* ---------- Hero (landing) ---------- */

.hero {
  padding: .5rem 0 .5rem;
  margin-bottom: 2rem;
}
.hero-eyebrow {
  display: inline-block;
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-ink);
  background: var(--accent-soft);
  padding: .25rem .55rem;
  border-radius: 2px;
  margin-bottom: 1.5rem;
}
.hero h1 {
  font-size: clamp(2.2rem, 4.5vw, 3.1rem);
  margin-bottom: 1.25rem;
}
.hero .lead {
  border-left: none;
  padding-left: 0;
  margin: 0 0 2rem 0;
  font-size: 1.2rem;
  color: var(--ink-soft);
}
.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1rem;
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .55rem 1.05rem;
  font-family: var(--sans);
  font-size: .92rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: 2px;
  border: 1px solid transparent;
  transition: background .15s ease, border-color .15s ease, color .15s ease;
  cursor: pointer;
}
.btn-primary {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}
.btn-primary:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--paper);
}
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--rule-strong);
}
.btn-ghost:hover {
  border-color: var(--ink);
  color: var(--ink);
}

/* ---------- KPI strip (no cards, minimal) ---------- */

.grid {
  display: grid;
  gap: 0;
}
.kpi-row,
section.container > .grid:not(.grid-2) {
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  margin: 2.5rem 0;
}
.kpi {
  padding: 1rem 1.25rem;
  border-right: 1px solid var(--rule);
  background: transparent;
  border-radius: 0;
}
.kpi:last-child { border-right: none; }
.kpi-val {
  font-family: var(--serif);
  font-size: 1.9rem;
  font-weight: 500;
  color: var(--accent);
  line-height: 1;
  margin-bottom: .25rem;
  font-variation-settings: "opsz" 144;
}
.kpi-label {
  font-size: .78rem;
  color: var(--ink-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ---------- Card grid ---------- */

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 0;
  border-top: 1px solid var(--rule);
}
.card {
  padding: 1.5rem 1.25rem 1.25rem;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--rule);
  border-right: 1px solid var(--rule);
  border-radius: 0;
}
.grid-2 .card:nth-child(2n) { border-right: none; }
.card-link { display: block; text-decoration: none; color: inherit; transition: background .15s ease; }
.card-link:hover { background: var(--paper-tint); }
.card-link:hover h3 { color: var(--accent); }
.card h3 {
  margin: 0 0 .5rem 0;
  font-family: var(--serif);
  font-size: 1.1rem;
  font-weight: 500;
  line-height: 1.25;
}
.card p {
  color: var(--ink-soft);
  font-size: .93rem;
  line-height: 1.55;
  margin: 0;
}

/* Single standalone card (latest release block) */
main > .card,
section.container > .card,
section.container-narrow > .card {
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: 1.5rem 1.5rem 1.25rem;
  background: var(--paper-tint);
  margin: 1.25rem 0;
}

/* ---------- Code ---------- */

code {
  font-family: var(--mono);
  font-size: 0.86em;
  color: var(--accent-ink);
  background: var(--accent-soft);
  padding: .1em .3em;
  border-radius: 2px;
  font-weight: 500;
}

pre {
  background: var(--code-bg);
  color: var(--code-fg);
  padding: 1.1rem 1.25rem;
  overflow-x: auto;
  border-radius: 3px;
  font-size: .86rem;
  line-height: 1.6;
  margin: 1.25rem 0;
  border: 1px solid var(--rule-strong);
}
pre code {
  background: none;
  color: inherit;
  padding: 0;
  font-weight: 400;
  font-size: inherit;
}

/* ---------- Tables (editorial, ruled-line) ---------- */

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0 2rem;
  font-size: .93rem;
  font-variant-numeric: tabular-nums;
}
thead th {
  font-family: var(--sans);
  font-weight: 600;
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-dim);
  text-align: left;
  padding: .5rem .75rem;
  border-bottom: 1.5px solid var(--ink);
  vertical-align: bottom;
}
tbody td {
  padding: .65rem .75rem;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
  color: var(--ink-soft);
}
tbody tr:last-child td { border-bottom: 1px solid var(--rule-strong); }
tbody tr:hover { background: var(--paper-tint); }

/* ---------- Callouts ---------- */

.callout {
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  font-size: .95rem;
  color: var(--ink-soft);
  border-radius: 0 2px 2px 0;
}
.callout strong { color: var(--accent-ink); }
.callout.warn {
  background: #2e1f12;
  border-left-color: #d9a45e;
}
.callout.warn strong { color: #f0c78a; }

/* ---------- Tags / pills ---------- */

.tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: .72rem;
  padding: .12em .55em;
  border-radius: 2px;
  background: var(--paper-deep);
  color: var(--ink-soft);
  font-weight: 500;
  letter-spacing: 0.02em;
  border: 1px solid var(--rule);
  margin-right: .25rem;
}
.tag.success, .tag.ok { background: #1e271a; color: #a8c48a; border-color: #394a32; }
.tag.warn { background: #2a2014; color: #d9a45e; border-color: #453625; }
.tag.accent { background: var(--accent-soft); color: var(--accent-ink); border-color: #4a3523; }
.tag.danger { background: #2a1717; color: #d9746c; border-color: #4a2a2a; }

/* ---------- Footer ---------- */

.footer {
  grid-column: 2;
  grid-row: 2;
  max-width: var(--content-w);
  width: 100%;
  margin: 0;
  padding: 2rem 3.5rem 3rem;
  color: var(--ink-faint);
  font-size: .85rem;
  border-top: 1px solid var(--rule);
  justify-self: start;
}
.footer a { color: var(--ink-dim); text-decoration: none; }
.footer a:hover { color: var(--accent); text-decoration: underline; }
.footer strong { color: var(--ink-soft); }
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Large container on models page uses wider content */
main.container,
section.container {
  max-width: 880px;
}

/* ---------- Responsive ---------- */

@media (max-width: 960px) {
  body {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr auto;
  }
  .topbar {
    grid-column: 1;
    grid-row: 1;
    position: static;
    height: auto;
    max-height: none;
    border-right: none;
    border-bottom: 1px solid var(--rule);
    padding: 1.25rem 1.5rem 1rem;
    overflow-y: visible;
  }
  .topbar-inner {
    gap: 1rem;
  }
  .brand {
    border-bottom: none;
    padding-bottom: 0;
  }
  .brand-logo { font-size: 1.3rem; margin-bottom: .15rem; }
  .nav {
    flex-direction: row;
    flex-wrap: wrap;
    gap: .1rem;
    margin-top: .5rem;
  }
  .nav a {
    padding: .3rem .7rem;
    border-left: none;
    border-bottom: 2px solid transparent;
    font-size: .88rem;
  }
  .nav a.active {
    background: transparent;
    border-left: none;
    border-bottom-color: var(--accent);
  }
  .nav-section {
    width: 100%;
    padding: .75rem .25rem .15rem;
    font-size: .65rem;
  }
  .nav-cta {
    border-top: none;
    padding-top: 0;
    margin-top: 0;
  }
  main,
  section.container,
  section.container-narrow,
  .footer {
    grid-column: 1;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
  }
  main,
  section.container,
  section.container-narrow {
    grid-row: 2;
    padding-top: 2.5rem;
  }
  .footer {
    grid-row: 3;
  }
}

@media (max-width: 600px) {
  body { font-size: 16px; }
  h1 { font-size: 1.9rem; }
  h2 { font-size: 1.35rem; margin-top: 2.5rem; padding-top: 1.75rem; }
  main,
  section.container,
  section.container-narrow,
  .footer {
    padding-left: 1.15rem;
    padding-right: 1.15rem;
  }
  .grid-2 .card {
    border-right: none !important;
  }
  .kpi:nth-child(n) { border-right: none; border-bottom: 1px solid var(--rule); }
  .kpi:last-child { border-bottom: none; }
  pre { font-size: .8rem; padding: .9rem 1rem; }
}

/* Print — keep it usable on paper */
@media print {
  body { display: block; background: #fff; color: #000; }
  .topbar, .footer .nav-cta { display: none; }
  main, section.container, section.container-narrow { max-width: none; padding: 1rem; }
  a { color: #000; text-decoration: underline; }
  pre { background: #f5f5f5; color: #000; border: 1px solid #ddd; }
}