/* ============================================================
   Sarpah — design system
   Confident-modern, geometric, institutional.
   Cool palette: paper, ink, deep navy, single restrained accent.
   Type: Source Serif 4 (display) + Inter (text) + JetBrains Mono (data).
   ============================================================ */

:root {
  /* Surfaces */
  --paper:        #F4F1EA;   /* warm bone — page */
  --paper-2:      #ECE8DE;   /* slightly recessed surface */
  --paper-3:      #E2DDD0;   /* hairline tint */
  --card:         #FBF9F4;   /* raised card */
  --ink:          #0F1B2D;   /* near-black, navy-cast */
  --ink-2:        #2A3A55;   /* secondary text */
  --ink-3:        #5A6A82;   /* tertiary text */
  --ink-4:        #8A95A7;   /* labels / meta */
  --rule:         rgba(15, 27, 45, 0.12);
  --rule-strong:  rgba(15, 27, 45, 0.22);
  --rule-soft:    rgba(15, 27, 45, 0.06);

  /* Brand */
  --navy:         #0E2B4E;   /* deep institutional navy */
  --navy-2:       #1A3D6B;
  --navy-ink:     #08182C;
  --accent:       #B8531A;   /* restrained terracotta — single accent */
  --accent-soft:  #E0B591;
  --accent-ink:   #6E2D08;
  --gold:         #B89464;   /* hairline gold for ribbons / numerics */

  /* Type stacks */
  --serif: "Source Serif 4", "Source Serif Pro", "Iowan Old Style", "Georgia", serif;
  --sans:  "Inter", "Söhne", "Helvetica Neue", "Arial", sans-serif;
  --mono:  "JetBrains Mono", "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  /* Scale (modular ~1.18) */
  --t-xs:    11px;
  --t-sm:    13px;
  --t-base:  15.5px;
  --t-md:    17px;
  --t-lg:    19px;
  --t-xl:    22px;
  --t-2xl:   28px;
  --t-3xl:   36px;
  --t-4xl:   46px;
  --t-5xl:   60px;
  --t-6xl:   80px;
  --t-7xl:   112px;

  /* Spacing */
  --s-1: 4px; --s-2: 8px; --s-3: 12px; --s-4: 16px; --s-5: 20px;
  --s-6: 24px; --s-7: 32px; --s-8: 40px; --s-9: 56px; --s-10: 72px;
  --s-11: 96px; --s-12: 128px;

  /* Layout */
  --container: 1200px;
  --measure:   68ch;
  --measure-tight: 52ch;

  /* Radii — institutional, geometric: very small */
  --r-xs: 2px;
  --r-sm: 3px;
  --r-md: 4px;

  /* Shadows */
  --shadow-1: 0 1px 0 rgba(15,27,45,0.04), 0 2px 6px rgba(15,27,45,0.04);
  --shadow-2: 0 4px 16px rgba(15,27,45,0.08), 0 1px 2px rgba(15,27,45,0.06);
  --shadow-modal: 0 30px 60px rgba(15,27,45,0.22), 0 6px 18px rgba(15,27,45,0.14);
}

/* Dark mode — kept as a tweak option, not default. */
[data-theme="dark"] {
  --paper:    #0B1322;
  --paper-2:  #101A2E;
  --paper-3:  #15243D;
  --card:     #122139;
  --ink:      #E8ECF3;
  --ink-2:    #B6C0D2;
  --ink-3:    #8A99B3;
  --ink-4:    #6A7894;
  --rule:        rgba(255,255,255,0.10);
  --rule-strong: rgba(255,255,255,0.18);
  --rule-soft:   rgba(255,255,255,0.05);
  --navy:     #2E5FA0;
  --navy-2:   #3F73B5;
  --navy-ink: #14233E;
  --accent:   #D88B57;
  --accent-soft: #5A2E15;
  --accent-ink: #F0C9A8;
  --gold:     #D7B47E;
}

/* ===== Reset & base ===== */
*, *::before, *::after { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: var(--t-base);
  line-height: 1.55;
  font-feature-settings: "ss01", "cv11", "cv02";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
body { min-height: 100vh; overflow-x: hidden; }
img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; }
hr { border: 0; border-top: 1px solid var(--rule); margin: var(--s-7) 0; }

/* ===== Type primitives ===== */
.serif { font-family: var(--serif); font-weight: 400; letter-spacing: -0.01em; }
.sans  { font-family: var(--sans); }
.mono  { font-family: var(--mono); font-feature-settings: "tnum" 1; }
.tnum  { font-variant-numeric: tabular-nums; }
.eyebrow {
  font-family: var(--mono);
  font-size: var(--t-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
  font-weight: 500;
}
.lede {
  font-family: var(--serif);
  font-size: var(--t-xl);
  line-height: 1.45;
  color: var(--ink-2);
  max-width: var(--measure);
  letter-spacing: -0.005em;
}

/* ===== Layout ===== */
.container { max-width: var(--container); margin: 0 auto; padding: 0 var(--s-6); }
.container-wide { max-width: 1360px; margin: 0 auto; padding: 0 var(--s-6); }
.container-narrow { max-width: 880px; margin: 0 auto; padding: 0 var(--s-6); }

/* ===== Surfaces ===== */
.surface { background: var(--card); border: 1px solid var(--rule); border-radius: var(--r-md); }
.divider { height: 1px; background: var(--rule); width: 100%; }
.divider-strong { height: 1px; background: var(--ink); opacity: .9; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; gap: var(--s-3);
  padding: 12px 18px;
  font-family: var(--sans);
  font-size: var(--t-sm);
  font-weight: 500;
  letter-spacing: 0.01em;
  border: 1px solid var(--ink);
  background: var(--ink); color: var(--paper);
  border-radius: var(--r-sm);
  cursor: pointer;
  transition: transform .12s ease, background .15s ease, color .15s ease, border-color .15s ease;
  text-decoration: none;
  white-space: nowrap;
}
.btn:hover { background: var(--navy); border-color: var(--navy); }
.btn:active { transform: translateY(1px); }
.btn--ghost {
  background: transparent; color: var(--ink);
  border-color: var(--rule-strong);
}
.btn--ghost:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn--accent {
  background: var(--accent); border-color: var(--accent); color: #fff;
}
.btn--accent:hover { background: var(--accent-ink); border-color: var(--accent-ink); }
.btn--lg { padding: 16px 24px; font-size: var(--t-base); }
.btn .arrow {
  display: inline-block; transition: transform .15s ease;
}
.btn:hover .arrow { transform: translateX(3px); }

/* ===== Anchor link ===== */
.link {
  display: inline-flex; align-items: center; gap: 8px;
  border-bottom: 1px solid var(--rule-strong);
  padding-bottom: 1px;
  transition: border-color .15s ease, color .15s ease;
}
.link:hover { border-color: var(--ink); color: var(--accent); }
.link .arrow { display: inline-block; transition: transform .15s ease; }
.link:hover .arrow { transform: translateX(3px); }

/* ===== Tags / chips ===== */
.tag {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--mono); font-size: var(--t-xs);
  text-transform: uppercase; letter-spacing: 0.12em;
  padding: 4px 8px;
  border: 1px solid var(--rule-strong);
  border-radius: var(--r-xs);
  color: var(--ink-2);
  background: transparent;
}
.tag--accent { color: var(--accent-ink); border-color: var(--accent); background: rgba(184,83,26,0.06); }
.tag--navy   { color: var(--navy);  border-color: var(--navy);  background: rgba(14,43,78,0.04); }
.tag--solid  { background: var(--ink); color: var(--paper); border-color: var(--ink); }

/* ===== Hairline ribbons (small data accents) ===== */
.ribbon {
  display: inline-flex; align-items: baseline; gap: 8px;
  font-family: var(--mono); font-size: var(--t-xs);
  text-transform: uppercase; letter-spacing: 0.18em;
  color: var(--ink-3);
}
.ribbon::before {
  content: ""; width: 22px; height: 1px; background: var(--ink);
  display: inline-block; transform: translateY(-3px);
}

/* ===== Markdown content ===== */
.prose { font-family: var(--sans); color: var(--ink); max-width: var(--measure); font-size: var(--t-md); line-height: 1.65; }
.prose > * + * { margin-top: 1.05em; }
.prose h1, .prose h2, .prose h3, .prose h4 {
  font-family: var(--serif); font-weight: 400;
  letter-spacing: -0.015em; color: var(--ink);
  text-wrap: balance;
}
.prose h1 { font-size: var(--t-4xl); line-height: 1.05; margin: 0 0 var(--s-6); }
.prose h2 { font-size: var(--t-2xl); line-height: 1.2; margin: var(--s-9) 0 var(--s-3); padding-top: var(--s-6); border-top: 1px solid var(--rule); }
.prose h2:first-child { padding-top: 0; border-top: 0; margin-top: 0; }
.prose h3 { font-size: var(--t-xl); line-height: 1.25; margin: var(--s-7) 0 var(--s-2); }
.prose h4 { font-size: var(--t-md); font-family: var(--sans); font-weight: 600; letter-spacing: 0; margin: var(--s-6) 0 var(--s-2); color: var(--ink); }
.prose p  { margin: 0; max-width: var(--measure); text-wrap: pretty; }
.prose strong { font-weight: 600; color: var(--ink); }
.prose em { font-style: italic; }
.prose a {
  color: var(--ink);
  border-bottom: 1px solid var(--rule-strong);
  transition: color .15s ease, border-color .15s ease;
}
.prose a:hover { color: var(--accent); border-bottom-color: var(--accent); }
.prose ul, .prose ol { padding-left: 1.4em; margin: 0; }
.prose li { margin-top: .35em; }
.prose ul > li::marker { color: var(--ink-4); }
.prose ol > li::marker { color: var(--ink-4); font-variant-numeric: tabular-nums; }
.prose blockquote {
  margin: 0; padding: var(--s-3) var(--s-6);
  border-left: 2px solid var(--accent);
  font-family: var(--serif); font-style: italic;
  color: var(--ink-2); font-size: var(--t-lg);
}
.prose code {
  font-family: var(--mono); font-size: 0.88em;
  background: var(--paper-3); padding: 2px 6px; border-radius: var(--r-xs);
  color: var(--ink);
}
.prose pre {
  font-family: var(--mono); font-size: var(--t-sm);
  background: var(--ink); color: var(--paper);
  padding: var(--s-5); border-radius: var(--r-sm);
  overflow-x: auto; line-height: 1.55;
}
.prose pre code { background: transparent; color: inherit; padding: 0; }
.prose hr { margin: var(--s-9) 0; }

/* Tables — institutional, dense, hairlines only */
.prose .table-wrap, .table-wrap {
  margin: var(--s-6) 0;
  width: 100%;
  max-width: 100%;
  border: 1px solid var(--rule);
  border-radius: var(--r-sm);
  overflow: hidden;
  position: relative;
}
.prose .table-scroll, .table-scroll {
  width: 100%; overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.prose table, table.data {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--sans); font-size: var(--t-sm);
  font-variant-numeric: tabular-nums;
}
.prose table thead th, table.data thead th {
  text-align: left; padding: 12px 14px;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--ink-3); font-weight: 500;
  background: var(--paper-2);
  border-bottom: 1px solid var(--rule-strong);
  white-space: nowrap;
}
.prose table tbody td, table.data tbody td {
  padding: 11px 14px;
  border-bottom: 1px solid var(--rule-soft);
  vertical-align: top;
  color: var(--ink);
}
.prose table tbody tr:last-child td, table.data tbody tr:last-child td { border-bottom: 0; }
.prose table tbody tr:hover td, table.data tbody tr:hover td { background: var(--paper-2); }

/* ===== Page-section primitives ===== */
.section { padding: var(--s-11) 0; }
.section--tight { padding: var(--s-9) 0; }
.section--loose { padding: var(--s-12) 0; }
.section--ink { background: var(--ink); color: var(--paper); }
.section--ink .eyebrow { color: rgba(244, 241, 234, 0.55); }
.section--ink .ribbon { color: rgba(244, 241, 234, 0.6); }
.section--ink .ribbon::before { background: rgba(244, 241, 234, 0.6); }
.section--ink h2, .section--ink h1, .section--ink h3 { color: var(--paper); }
.section--paper-2 { background: var(--paper-2); }

/* ===== Visually hidden ===== */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ===== Display heading ===== */
.display {
  font-family: var(--serif); font-weight: 400;
  letter-spacing: -0.022em; line-height: 0.98;
  color: var(--ink);
  text-wrap: balance;
}
.display em { font-style: italic; color: var(--accent); }
.display .accent { color: var(--accent); font-style: italic; }

/* ===== Loaded state ===== */
[data-loading="true"] { opacity: 0; }
.loaded [data-loading="true"] { opacity: 1; transition: opacity .25s ease; }

/* ===== Focus ===== */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ===== Small responsive defaults ===== */
@media (max-width: 760px) {
  :root {
    --t-3xl: 30px;
    --t-4xl: 36px;
    --t-5xl: 44px;
    --t-6xl: 56px;
    --t-7xl: 72px;
  }
  .section { padding: var(--s-9) 0; }
  .section--loose { padding: var(--s-10) 0; }
}

/* ===== Print ===== */
@media print {
  .no-print, .site-nav, .site-footer, .search-trigger { display: none !important; }
  body { background: #fff; }
}