/* =============================================================
   Idea Fields Institute — design system
   Restrained dryland palette · editorial type · light + dark
   ============================================================= */

/* ---------- Tokens ---------- */
:root {
  /* Light theme */
  --bg:           #f3ede1;
  --bg-soft:      #ece5d6;
  --surface:      #ebe3d2;
  --surface-2:    #e4dbc7;
  --ink:          #25221c;
  --ink-soft:     #3b362d;
  --ink-muted:    #6b6457;
  --rule:         #cdc4b1;
  --rule-soft:    #d9d1bf;

  /* Field accents — muted earth */
  --accent:       #5e6f4c;   /* muted field green (primary accent) */
  --accent-ink:   #44523a;
  --clay:         #a47a51;   /* warm soil */
  --sage:         #7a8a6d;
  --stone:        #8a8472;
  --slate:        #525c63;

  /* Field tile tints (subtle washes for the patchwork) */
  --field-human:     #ead9c4;   /* warm linen */
  --field-technical: #dfd9c8;   /* stone */
  --field-analog:    #e0d2b4;   /* warm wheat */
  --field-digital:   #d0d4d4;   /* cool slate-grey */

  /* For inline svg wordmark fills via currentColor scaffold */
  --mark-fill:    #5e6f4c;

  /* Type scale */
  --font-serif: 'Fraunces', 'Source Serif Pro', 'Iowan Old Style', Georgia, serif;
  --font-sans:  'Public Sans', system-ui, -apple-system, 'Segoe UI', Helvetica, Arial, sans-serif;

  --fs-100: 0.78rem;   /* ~12.5 */
  --fs-200: 0.875rem;  /* 14    */
  --fs-300: 1rem;      /* 16    */
  --fs-400: 1.0625rem; /* 17    */
  --fs-500: 1.1875rem; /* 19    */
  --fs-600: 1.5rem;    /* 24    */
  --fs-700: 2rem;      /* 32    */
  --fs-800: 2.75rem;   /* 44    */
  --fs-900: clamp(2.6rem, 5vw + 1rem, 4.6rem);

  /* Spacing */
  --s-1:  0.25rem;
  --s-2:  0.5rem;
  --s-3:  0.75rem;
  --s-4:  1rem;
  --s-5:  1.5rem;
  --s-6:  2rem;
  --s-7:  3rem;
  --s-8:  4.5rem;
  --s-9:  6.5rem;
  --s-10: 9rem;

  /* Geometry */
  --radius-sm: 4px;
  --radius:    10px;
  --radius-lg: 18px;
  --container: 1180px;
  --container-narrow: 720px;

  /* Motion */
  --ease: cubic-bezier(.22,.61,.36,1);
  --t-fast: 180ms;
  --t-med:  320ms;
  --t-slow: 520ms;

  color-scheme: light;
}

[data-theme="dark"] {
  --bg:           #181714;
  --bg-soft:      #1e1c18;
  --surface:      #23211c;
  --surface-2:    #2a2722;
  --ink:          #ece4d2;
  --ink-soft:     #d8d0bd;
  --ink-muted:    #9a9281;
  --rule:         #36322a;
  --rule-soft:    #2c2922;

  --accent:       #97ad7c;
  --accent-ink:   #b4c699;
  --clay:         #c69876;
  --sage:         #a3b58a;
  --stone:        #9a9282;
  --slate:        #8c969d;

  --field-human:     #2a2620;
  --field-technical: #25241f;
  --field-analog:    #2e2820;
  --field-digital:   #202425;

  --mark-fill:    #97ad7c;

  color-scheme: dark;
}

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

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: var(--fs-400);
  line-height: 1.6;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: 'kern' 1, 'liga' 1;
  transition: background var(--t-med) var(--ease), color var(--t-med) var(--ease);
}

@media (max-width: 640px) {
  body { font-size: var(--fs-300); }
}

/* Paper grain — a quiet print texture over everything */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 2000;
  pointer-events: none;
  opacity: .05;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='180' height='180'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
  background-size: 180px 180px;
  mix-blend-mode: multiply;
}
[data-theme="dark"] body::after {
  opacity: .07;
  mix-blend-mode: screen;
}

img, svg { display: block; max-width: 100%; }

a {
  color: var(--accent-ink);
  text-decoration: none;
  text-decoration-color: var(--rule);
  text-underline-offset: 3px;
  transition: color var(--t-fast) var(--ease), text-decoration-color var(--t-fast) var(--ease);
}
a:hover { color: var(--accent); text-decoration: underline; text-decoration-color: currentColor; }

[data-theme="dark"] a { color: var(--accent); }
[data-theme="dark"] a:hover { color: var(--accent-ink); }

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.15;
  margin: 0;
  color: var(--ink);
  font-variation-settings: 'opsz' 36;
}

.display {
  font-family: var(--font-serif);
  font-weight: 400;
  font-variation-settings: 'opsz' 120;
  letter-spacing: -0.018em;
  line-height: 1.05;
}

p { margin: 0 0 var(--s-4); }
p:last-child { margin-bottom: 0; }

::selection {
  background: var(--accent);
  color: var(--bg);
}

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--ink); color: var(--bg);
  padding: var(--s-2) var(--s-4); border-radius: var(--radius-sm);
}
.skip-link:focus { left: var(--s-4); top: var(--s-4); z-index: 100; }

/* ---------- Layout helpers ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 4vw, 2.5rem);
}
.container.narrow { max-width: var(--container-narrow); }

.section {
  padding-block: clamp(4rem, 9vw, 8rem);
  position: relative;
}

.section + .section { border-top: 1px solid var(--rule); }

.section-head {
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
  max-width: 56ch;
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}

.section-label {
  font-family: var(--font-sans);
  font-size: var(--fs-100);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin: 0 0 var(--s-3);
  display: flex;
  align-items: baseline;
  gap: var(--s-3);
}

.label-num {
  font-family: var(--font-serif);
  font-variation-settings: 'opsz' 36;
  font-size: var(--fs-200);
  font-style: italic;
  letter-spacing: 0.04em;
  color: var(--accent);
}
.label-num::after {
  content: '';
  display: inline-block;
  width: 22px;
  height: 1px;
  background: var(--rule);
  vertical-align: middle;
  margin-left: var(--s-3);
}

.section-title {
  font-size: clamp(2rem, 3.6vw, 2.9rem);
  margin: 0;
  text-wrap: balance;
}

.section-deck {
  color: var(--ink-soft);
  font-size: var(--fs-500);
  max-width: 58ch;
  margin: 0;
}

/* ---------- Header / nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklab, var(--bg) 86%, transparent);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid color-mix(in oklab, var(--rule) 70%, transparent);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: var(--s-5);
  min-height: 68px;
  padding-block: var(--s-3);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--s-3);
  color: var(--ink);
  text-decoration: none;
  flex: 0 0 auto;
}
.brand:hover { color: var(--ink); }
.brand-mark { width: 32px; height: 32px; color: var(--accent); flex: 0 0 auto; }
.brand-text { display: inline-flex; flex-direction: column; line-height: 1; }
.brand-name {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 1.05rem;
  font-variation-settings: 'opsz' 36;
  letter-spacing: -0.005em;
}
.brand-sub {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-top: 3px;
}

.site-nav { margin-left: auto; }
.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2vw, 1.75rem);
  list-style: none;
  padding: 0;
  margin: 0;
}
.nav-list a {
  font-size: 0.95rem;
  color: var(--ink-soft);
  position: relative;
  padding: 6px 0;
}
.nav-list a:hover { color: var(--ink); }
.nav-list a::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--t-fast) var(--ease);
}
.nav-list a:hover::after { transform: scaleX(1); }

.nav-toggle {
  display: none;
  appearance: none;
  background: transparent;
  border: 1px solid var(--rule);
  width: 38px; height: 38px;
  border-radius: var(--radius-sm);
  padding: 9px 8px;
  flex-direction: column;
  justify-content: space-between;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  height: 1.5px;
  width: 100%;
  background: var(--ink-soft);
  transition: transform var(--t-fast) var(--ease), opacity var(--t-fast) var(--ease);
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Theme toggle */
.theme-toggle {
  appearance: none;
  background: transparent;
  border: 1px solid var(--rule);
  border-radius: 999px;
  width: 38px; height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-soft);
  cursor: pointer;
  flex: 0 0 auto;
  transition: border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}
.theme-toggle:hover { border-color: var(--ink-soft); color: var(--ink); }
.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun  { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: block; }
.theme-toggle-sm { width: 32px; height: 32px; }
.theme-toggle-sm svg { width: 15px; height: 15px; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding-block: clamp(4rem, 8vw, 7rem) clamp(3.5rem, 7vw, 6rem);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 18% 12%, color-mix(in oklab, var(--accent) 7%, transparent), transparent 55%),
    radial-gradient(circle at 82% 88%, color-mix(in oklab, var(--clay) 6%, transparent), transparent 60%);
  pointer-events: none;
  z-index: 0;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: clamp(2.5rem, 5vw, 5rem);
  align-items: center;
  position: relative;
  z-index: 1;
}

.eyebrow {
  font-family: var(--font-sans);
  font-size: var(--fs-200);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin: 0 0 var(--s-4);
  display: inline-flex;
  align-items: center;
  gap: var(--s-3);
}
.eyebrow::before {
  content: '';
  width: 28px;
  height: 1px;
  background: var(--accent);
}

.hero h1 {
  font-size: var(--fs-900);
  margin: 0;
  line-height: 0.98;
  font-variation-settings: 'opsz' 144;
  font-weight: 400;
}

.tagline {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(1.2rem, 1.6vw, 1.45rem);
  color: var(--ink-soft);
  margin: var(--s-5) 0 var(--s-4);
  max-width: 32ch;
  font-variation-settings: 'opsz' 60;
}

.lede {
  font-size: var(--fs-500);
  color: var(--ink-soft);
  max-width: 50ch;
  margin: var(--s-4) 0 var(--s-6);
}

.cta-row {
  display: inline-flex;
  flex-wrap: wrap;
  gap: var(--s-3);
  margin-top: var(--s-5);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.78rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: 999px;
  border: 1px solid transparent;
  text-decoration: none;
  transition: background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}
.btn-primary:hover {
  background: var(--accent-ink);
  border-color: var(--accent-ink);
  color: var(--bg);
  text-decoration: none;
}

[data-theme="dark"] .btn-primary { color: #1a1814; }
[data-theme="dark"] .btn-primary:hover { color: #14130f; background: var(--accent-ink); }

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--rule);
}
.btn-ghost:hover {
  border-color: var(--ink-soft);
  color: var(--ink);
  background: color-mix(in oklab, var(--ink) 4%, transparent);
  text-decoration: none;
}

/* Hero quiet mark */
.hero-mark {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  justify-content: center;
  gap: var(--s-3);
  max-width: 320px;
  margin-left: auto;
}

.mark-glyph {
  width: 100%;
  max-width: 300px;
  height: auto;
  color: var(--ink-muted);
}

/* Survey drawing draws itself in on load */
.mark-glyph .draw path,
.mark-glyph .draw line {
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
  animation: glyph-draw 1.6s var(--ease) forwards;
}
.mark-glyph .draw-late path,
.mark-glyph .draw-late line { animation-delay: .9s; animation-duration: .8s; }
.mark-glyph .fade {
  opacity: 0;
  animation: glyph-fade .9s var(--ease) 1.5s forwards;
}
@keyframes glyph-draw { to { stroke-dashoffset: 0; } }
@keyframes glyph-fade { to { opacity: 1; } }

.mark-caption {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 0.8rem;
  color: var(--ink-muted);
  margin: 0;
  text-align: right;
  max-width: 22ch;
  line-height: 1.4;
  font-variation-settings: 'opsz' 36;
}

/* ---------- About / prose ---------- */
.prose {
  max-width: 64ch;
  color: var(--ink-soft);
  font-size: var(--fs-500);
}
.prose .lead {
  font-family: var(--font-serif);
  font-size: clamp(1.3rem, 1.8vw, 1.55rem);
  font-weight: 400;
  font-variation-settings: 'opsz' 60;
  color: var(--ink);
  letter-spacing: -0.005em;
  line-height: 1.35;
  margin-bottom: var(--s-5);
}
.prose p + p { margin-top: var(--s-4); }

/* ---------- Fields / patchwork composition ---------- */
.section-fields { background: color-mix(in oklab, var(--bg-soft) 80%, var(--bg)); }
[data-theme="dark"] .section-fields { background: color-mix(in oklab, var(--bg-soft) 70%, var(--bg)); }

.patchwork {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(1rem, 1.6vw, 1.5rem);
  position: relative;
}

.patch-tile {
  position: relative;
  padding: clamp(1.5rem, 2.2vw, 2.1rem);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--surface);
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
  transition: transform var(--t-med) var(--ease), border-color var(--t-fast) var(--ease), background var(--t-med) var(--ease);
}

.patch-tile:hover {
  border-color: color-mix(in oklab, var(--ink-soft) 40%, var(--rule));
  transform: translateY(-3px);
  box-shadow: 0 18px 40px -28px color-mix(in oklab, var(--ink) 45%, transparent);
}

.tile-human     { background: color-mix(in oklab, var(--field-human) 50%, var(--bg)); }
.tile-technical { background: color-mix(in oklab, var(--field-technical) 55%, var(--bg)); }
.tile-analog    { background: color-mix(in oklab, var(--field-analog) 50%, var(--bg)); }
.tile-digital   { background: color-mix(in oklab, var(--field-digital) 50%, var(--bg)); }

[data-theme="dark"] .tile-human     { background: color-mix(in oklab, var(--field-human) 65%, var(--surface)); }
[data-theme="dark"] .tile-technical { background: color-mix(in oklab, var(--field-technical) 60%, var(--surface)); }
[data-theme="dark"] .tile-analog    { background: color-mix(in oklab, var(--field-analog) 65%, var(--surface)); }
[data-theme="dark"] .tile-digital   { background: color-mix(in oklab, var(--field-digital) 60%, var(--surface)); }

.tile-head {
  display: flex;
  align-items: center;
  gap: var(--s-3);
}

.patch-tile h3 {
  font-family: var(--font-serif);
  font-size: 1.7rem;
  font-weight: 500;
  font-variation-settings: 'opsz' 60;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.field-glyph {
  width: 30px;
  height: 30px;
  color: var(--accent-ink);
  flex: 0 0 auto;
}
[data-theme="dark"] .field-glyph { color: var(--accent); }

.patch-tile p {
  color: var(--ink-soft);
  font-size: var(--fs-400);
  line-height: 1.55;
  max-width: 42ch;
}

/* Each tile gets a slightly different glyph accent */
.tile-human    .field-glyph { color: var(--clay); }
.tile-analog   .field-glyph { color: var(--clay); }
.tile-technical .field-glyph { color: var(--stone); }
.tile-digital  .field-glyph { color: var(--slate); }

[data-theme="dark"] .tile-human    .field-glyph { color: var(--clay); }
[data-theme="dark"] .tile-analog   .field-glyph { color: var(--clay); }
[data-theme="dark"] .tile-technical .field-glyph { color: var(--stone); }
[data-theme="dark"] .tile-digital  .field-glyph { color: var(--slate); }

/* ---------- Projects ---------- */
.projects-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  column-gap: clamp(2rem, 4vw, 4rem);
  row-gap: 0;
}

.project {
  display: grid;
  grid-template-columns: 1fr;
  padding: var(--s-6) 0;
  border-bottom: 1px solid var(--rule);
}
@media (min-width: 720px) {
  .project:nth-last-child(-n+2) { border-bottom: none; }
}
@media (max-width: 719px) {
  .project:last-child { border-bottom: none; }
}

.project-meta {
  font-family: var(--font-sans);
  font-size: var(--fs-100);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin: 0 0 var(--s-3);
}

.project-name {
  font-family: var(--font-serif);
  font-size: 1.55rem;
  font-weight: 500;
  font-variation-settings: 'opsz' 60;
  letter-spacing: -0.01em;
  line-height: 1.2;
  margin: 0 0 var(--s-3);
}
.project-name a {
  color: var(--ink);
  background-image: linear-gradient(to right, var(--accent), var(--accent));
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 0% 1.5px;
  transition: background-size var(--t-med) var(--ease), color var(--t-fast) var(--ease);
  text-decoration: none;
}
.project-name a:hover {
  background-size: 100% 1.5px;
  color: var(--ink);
}
.project-name a[href^="http"]::after {
  content: ' \2197';
  font-family: var(--font-sans);
  font-size: 0.7em;
  color: var(--ink-muted);
  vertical-align: super;
}

.project-blurb {
  color: var(--ink-soft);
  font-size: var(--fs-400);
  max-width: 46ch;
  margin: 0;
}

/* ---------- Charter ---------- */
.section-charter { background: color-mix(in oklab, var(--bg-soft) 65%, var(--bg)); }
[data-theme="dark"] .section-charter { background: color-mix(in oklab, var(--bg-soft) 55%, var(--bg)); }

.principles {
  list-style: none;
  padding: 0;
  margin: 0;
  border-top: 1px solid color-mix(in oklab, var(--ink-soft) 45%, var(--rule));
}

.principle {
  display: grid;
  grid-template-columns: clamp(4.5rem, 8vw, 7.5rem) 1fr;
  gap: clamp(1.25rem, 3vw, 3rem);
  align-items: start;
  padding-block: clamp(1.75rem, 3.5vw, 2.75rem);
  border-bottom: 1px solid var(--rule);
}

.principle-num {
  font-size: clamp(2.2rem, 4vw, 3.4rem);
  font-variation-settings: 'opsz' 144;
  font-weight: 300;
  line-height: 1;
  color: color-mix(in oklab, var(--accent) 55%, var(--ink-muted));
  transition: color var(--t-med) var(--ease), transform var(--t-med) var(--ease);
}
.principle:hover .principle-num {
  color: var(--accent);
  transform: translateX(4px);
}

.principle-body {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: var(--s-3) clamp(2rem, 4vw, 4rem);
  align-items: start;
}

.principle-name {
  grid-column: 1 / -1;
  font-family: var(--font-sans);
  font-size: var(--fs-100);
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin: 0;
}

.principle-statement {
  font-family: var(--font-serif);
  font-size: clamp(1.3rem, 1.9vw, 1.7rem);
  font-weight: 400;
  font-variation-settings: 'opsz' 72;
  letter-spacing: -0.01em;
  line-height: 1.28;
  color: var(--ink);
  margin: 0;
  max-width: 30ch;
  text-wrap: balance;
}

.principle-support {
  color: var(--ink-muted);
  font-size: var(--fs-300);
  line-height: 1.6;
  margin: 0;
  max-width: 48ch;
  padding-top: 0.35rem;
}

@media (max-width: 880px) {
  .principle-body { grid-template-columns: 1fr; }
  .principle-support { padding-top: 0; }
}

/* ---------- Contact ---------- */
.section-contact { padding-block: clamp(4rem, 8vw, 7rem); }

.contact-line {
  font-size: clamp(1.8rem, 3.2vw, 2.6rem);
  line-height: 1.2;
  margin: var(--s-4) 0 var(--s-5);
  max-width: 24ch;
  color: var(--ink);
  font-weight: 400;
  font-variation-settings: 'opsz' 120;
}
.contact-line a {
  color: var(--ink);
  border-bottom: 1px solid var(--accent);
  padding-bottom: 2px;
}
.contact-line a:hover { color: var(--accent-ink); text-decoration: none; }
[data-theme="dark"] .contact-line a { color: var(--ink); border-bottom-color: var(--accent); }
[data-theme="dark"] .contact-line a:hover { color: var(--accent); }

.contact-meta {
  font-family: var(--font-sans);
  font-size: var(--fs-200);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-muted);
  display: inline-flex;
  flex-wrap: wrap;
  gap: var(--s-3);
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--rule);
  padding-block: var(--s-7);
  background: var(--bg-soft);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-5);
  align-items: center;
  justify-content: space-between;
}

.footer-left {
  display: flex;
  align-items: center;
  gap: var(--s-4);
}

.footer-mark {
  width: 28px; height: 28px;
  color: var(--ink-muted);
  flex: 0 0 auto;
}

.footer-text { display: flex; flex-direction: column; line-height: 1.3; }
.footer-domain {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 500;
  font-variation-settings: 'opsz' 36;
  margin: 0;
  color: var(--ink);
}
.footer-tag {
  font-size: var(--fs-200);
  color: var(--ink-muted);
  margin: 2px 0 0;
}

.footer-nav {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--s-5);
  font-size: var(--fs-200);
}
.footer-nav a { color: var(--ink-soft); }
.footer-nav a:hover { color: var(--ink); }

.footer-right {
  display: inline-flex;
  align-items: center;
  gap: var(--s-4);
  color: var(--ink-muted);
  font-size: var(--fs-200);
}
.footer-copy { white-space: nowrap; }
.back-top {
  color: var(--ink-muted);
}
.back-top:hover { color: var(--ink); text-decoration: none; }

/* ---------- Reveal animation ---------- */
.reveal {
  opacity: 0;
  transform: translate3d(0, 14px, 0);
  transition: opacity var(--t-slow) var(--ease), transform var(--t-slow) var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}
.reveal.is-visible {
  opacity: 1;
  transform: translate3d(0,0,0);
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: clamp(2rem, 4vw, 3rem);
  }
  .hero-mark { display: none; }

  .patchwork {
    grid-template-columns: 1fr;
  }

  .projects-list {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .nav-toggle { display: inline-flex; }
  .site-nav { position: relative; margin-left: auto; }
  .nav-list {
    position: absolute;
    top: calc(100% + 12px);
    right: -8px;
    background: var(--bg);
    border: 1px solid var(--rule);
    border-radius: var(--radius);
    box-shadow: 0 12px 32px -16px color-mix(in oklab, var(--ink) 30%, transparent);
    flex-direction: column;
    align-items: stretch;
    padding: var(--s-3);
    gap: 0;
    min-width: 180px;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-6px);
    transition: opacity var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
  }
  .nav-list.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }
  .nav-list li { border-bottom: 1px solid var(--rule-soft); }
  .nav-list li:last-child { border-bottom: none; }
  .nav-list a {
    display: block;
    padding: var(--s-3) var(--s-3);
    font-size: var(--fs-400);
    color: var(--ink);
  }
  .nav-list a::after { display: none; }

  .header-inner { gap: var(--s-3); }
  .brand-sub { display: none; }

  .footer-inner { flex-direction: column; align-items: flex-start; gap: var(--s-4); }
  .footer-right { width: 100%; justify-content: space-between; }
}

@media (max-width: 560px) {
  .principle {
    grid-template-columns: 1fr;
    gap: var(--s-3);
  }
  .principle-num { font-size: 1.9rem; }
}

@media (max-width: 480px) {
  .cta-row { width: 100%; }
  .btn { flex: 1; justify-content: center; }
  .hero h1 { font-size: clamp(2.4rem, 11vw, 3.4rem); }
}

/* =============================================================
   IFI Research — page-specific styles
   (extends the shared Idea Fields design system above)
   ============================================================= */

.section-alt { background: color-mix(in oklab, var(--bg-soft) 75%, var(--bg)); }
[data-theme="dark"] .section-alt { background: color-mix(in oklab, var(--bg-soft) 65%, var(--bg)); }

/* ---------- Areas of inquiry ---------- */
.areas-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  column-gap: clamp(2rem, 4vw, 4rem);
}

.area {
  padding: var(--s-6) 0;
  border-bottom: 1px solid var(--rule);
}
@media (min-width: 720px) {
  .area:nth-last-child(-n+2) { border-bottom: none; }
}
@media (max-width: 719px) {
  .areas-list { grid-template-columns: 1fr; }
  .area:last-child { border-bottom: none; }
}

.area-meta {
  font-family: var(--font-sans);
  font-size: var(--fs-100);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 var(--s-3);
}

.area-name {
  font-family: var(--font-serif);
  font-size: 1.55rem;
  font-weight: 500;
  font-variation-settings: 'opsz' 60;
  letter-spacing: -0.01em;
  line-height: 1.2;
  margin: 0 0 var(--s-3);
}

.area-blurb {
  color: var(--ink-soft);
  font-size: var(--fs-400);
  max-width: 46ch;
  margin: 0;
}

/* ---------- Method grid ---------- */
.method-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1.5rem, 3vw, 2.5rem) clamp(1.5rem, 3vw, 3rem);
}
@media (max-width: 960px) { .method-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 640px) { .method-grid { grid-template-columns: 1fr; } }

.method-item {
  border-top: 1px solid color-mix(in oklab, var(--ink-soft) 40%, var(--rule));
  padding-top: var(--s-4);
}

.method-item h3 {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 500;
  font-variation-settings: 'opsz' 48;
  margin: 0 0 var(--s-3);
}

.method-item p {
  color: var(--ink-soft);
  font-size: var(--fs-300);
  line-height: 1.6;
  margin: 0;
}

/* ---------- Participant commitments ---------- */
.commitments {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(1.75rem, 3vw, 3rem) clamp(2rem, 4vw, 4rem);
}
@media (max-width: 760px) { .commitments { grid-template-columns: 1fr; } }

.commitment {
  border-top: 1px solid var(--rule);
  padding-top: var(--s-4);
}

.commitment-statement {
  font-family: var(--font-serif);
  font-size: clamp(1.2rem, 1.6vw, 1.45rem);
  font-weight: 400;
  font-variation-settings: 'opsz' 60;
  letter-spacing: -0.01em;
  line-height: 1.3;
  color: var(--ink);
  margin: 0 0 var(--s-3);
  text-wrap: balance;
}

.commitment-support {
  color: var(--ink-muted);
  font-size: var(--fs-300);
  line-height: 1.6;
  margin: 0;
  max-width: 44ch;
}

/* ---------- Nav: parent-site link ---------- */
.nav-list .nav-parent { color: var(--ink-muted); }
.nav-list .nav-parent:hover { color: var(--ink); }

/* ---------- Papers list (research home) ---------- */
.papers-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.paper-entry {
  display: grid;
  grid-template-columns: clamp(7rem, 14vw, 11rem) 1fr;
  gap: clamp(1.25rem, 3vw, 3rem);
  padding-block: clamp(1.75rem, 3vw, 2.5rem);
  border-top: 1px solid var(--rule);
}
.paper-entry:last-child { border-bottom: 1px solid var(--rule); }
@media (max-width: 640px) { .paper-entry { grid-template-columns: 1fr; gap: var(--s-3); } }

.paper-entry-meta {
  font-family: var(--font-sans);
  font-size: var(--fs-100);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin: 0;
  line-height: 1.9;
}
.paper-entry-meta .paper-no { color: var(--accent); display: block; }

.paper-entry-title {
  font-family: var(--font-serif);
  font-size: clamp(1.35rem, 2vw, 1.7rem);
  font-weight: 500;
  font-variation-settings: 'opsz' 60;
  letter-spacing: -0.01em;
  line-height: 1.25;
  margin: 0 0 var(--s-3);
  text-wrap: balance;
}
.paper-entry-title a {
  color: var(--ink);
  background-image: linear-gradient(to right, var(--accent), var(--accent));
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 0% 1.5px;
  transition: background-size var(--t-med) var(--ease);
}
.paper-entry-title a:hover { background-size: 100% 1.5px; text-decoration: none; }

.paper-entry-blurb {
  color: var(--ink-soft);
  font-size: var(--fs-300);
  line-height: 1.6;
  max-width: 62ch;
  margin: 0 0 var(--s-3);
}

.paper-entry-links {
  font-family: var(--font-sans);
  font-size: var(--fs-200);
  display: inline-flex;
  flex-wrap: wrap;
  gap: var(--s-4);
  margin: 0;
}
.paper-entry-links a { color: var(--accent-ink); }
[data-theme="dark"] .paper-entry-links a { color: var(--accent); }

/* ---------- Paper landing page ---------- */
.nav-list-static { margin-left: auto; }

.paper-header {
  padding-block: clamp(3rem, 6vw, 5rem) clamp(1rem, 2vw, 2rem);
}

.paper-back {
  font-family: var(--font-sans);
  font-size: var(--fs-200);
  color: var(--ink-muted);
}
.paper-back:hover { color: var(--ink); }

.paper-meta-line {
  font-family: var(--font-sans);
  font-size: var(--fs-200);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-muted);
  display: inline-flex;
  flex-wrap: wrap;
  gap: var(--s-3);
  margin: var(--s-5) 0 var(--s-4);
}
.paper-series { color: var(--accent); font-weight: 600; }
.paper-status { color: var(--clay); }

.paper-title {
  font-size: clamp(2rem, 4.2vw, 3.4rem);
  margin: 0 0 var(--s-3);
  text-wrap: balance;
}

.paper-subtitle {
  font-family: var(--font-serif);
  font-style: italic;
  font-variation-settings: 'opsz' 60;
  font-size: clamp(1.2rem, 2vw, 1.5rem);
  color: var(--ink-soft);
  line-height: 1.35;
  margin: 0 0 var(--s-5);
  text-wrap: balance;
}

.paper-authors {
  font-size: var(--fs-400);
  color: var(--ink);
  margin: 0 0 var(--s-5);
}
.paper-affil { color: var(--ink-muted); }

.paper-abstract { padding-block: clamp(2rem, 4vw, 3.5rem); }
.paper-abstract .prose p { font-size: var(--fs-400); }

/* ---------- Artifact list ---------- */
.artifact-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.artifact {
  display: grid;
  grid-template-columns: 3.4rem 1fr;
  gap: clamp(1rem, 2vw, 1.5rem);
  align-items: start;
  padding-block: var(--s-4);
  border-bottom: 1px solid var(--rule);
}
.artifact:last-child { border-bottom: none; }

.artifact-kind {
  font-family: var(--font-sans);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-ink);
  border: 1px solid color-mix(in oklab, var(--accent) 45%, var(--rule));
  border-radius: var(--radius-sm);
  padding: 0.25rem 0;
  text-align: center;
  margin-top: 0.15rem;
}
[data-theme="dark"] .artifact-kind { color: var(--accent); }

.artifact-name {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 500;
  font-variation-settings: 'opsz' 48;
  color: var(--ink);
}
.artifact-name:hover { color: var(--accent-ink); }

.artifact-desc {
  color: var(--ink-muted);
  font-size: var(--fs-200);
  line-height: 1.55;
  margin: var(--s-1) 0 0;
  max-width: 58ch;
}

/* ---------- Citation block ---------- */
.cite-block {
  border: 1px solid var(--rule);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  background: color-mix(in oklab, var(--surface) 65%, var(--bg));
  padding: clamp(1.25rem, 2.5vw, 1.75rem) clamp(1.5rem, 3vw, 2rem);
  font-size: var(--fs-300);
  color: var(--ink-soft);
  line-height: 1.7;
}
[data-theme="dark"] .cite-block { background: color-mix(in oklab, var(--surface) 80%, var(--bg)); }
.cite-block p { margin: 0; }
.cite-url {
  display: block;
  font-family: var(--font-sans);
  font-size: var(--fs-200);
  color: var(--ink-muted);
  margin-top: var(--s-2);
  word-break: break-all;
}

.paper-contact {
  margin-top: var(--s-5);
  color: var(--ink-muted);
  font-size: var(--fs-300);
}

/* ---------- Mobile: static nav (paper pages have no menu toggle) ---------- */
@media (max-width: 760px) {
  .nav-list-static {
    position: static;
    flex-direction: row;
    align-items: center;
    gap: var(--s-4);
    background: transparent;
    border: none;
    box-shadow: none;
    padding: 0;
    min-width: 0;
    opacity: 1;
    pointer-events: auto;
    transform: none;
  }
  .nav-list-static li { border-bottom: none; }
  .nav-list-static a { padding: 6px 0; font-size: var(--fs-200); }
}

/* ---------- Plain-language summary ---------- */
.plain-headline {
  font-size: clamp(1.55rem, 2.8vw, 2.3rem);
  line-height: 1.18;
  margin: 0 0 clamp(1.75rem, 3vw, 2.5rem);
  max-width: 26ch;
  text-wrap: balance;
}

.plain-body {
  display: flex;
  flex-direction: column;
  gap: clamp(1.5rem, 2.5vw, 2rem);
}

.plain-body h3 {
  font-family: var(--font-sans);
  font-size: var(--fs-100);
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-ink);
  margin: 0 0 var(--s-2);
  display: flex;
  align-items: center;
  gap: var(--s-3);
}
[data-theme="dark"] .plain-body h3 { color: var(--accent); }
.plain-body h3::before {
  content: '';
  width: 16px;
  height: 1px;
  background: var(--accent);
  flex: 0 0 auto;
}
.plain-body h3 em { font-style: normal; text-decoration: underline; text-underline-offset: 3px; }

.plain-body p {
  color: var(--ink-soft);
  font-size: var(--fs-400);
  line-height: 1.65;
  margin: 0;
  max-width: 66ch;
}

.plain-caveat h3 { color: var(--clay); }
.plain-caveat h3::before { background: var(--clay); }

.plain-glossary {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
  max-width: 66ch;
}
.plain-glossary dt {
  display: inline;
  font-family: var(--font-serif);
  font-weight: 500;
  font-variation-settings: 'opsz' 48;
  color: var(--ink);
}
.plain-glossary dt::after { content: ' — '; color: var(--ink-muted); font-weight: 400; }
.plain-glossary dd {
  display: inline;
  margin: 0;
  color: var(--ink-soft);
  font-size: var(--fs-300);
}

/* ---------- "See all papers" link on research home ---------- */
.papers-see-all {
  margin: clamp(2rem, 4vw, 3rem) 0 0;
  font-family: var(--font-sans);
  font-size: var(--fs-300);
  border-top: 1px solid var(--rule);
  padding-top: clamp(1.5rem, 3vw, 2rem);
}
.papers-see-all a {
  font-weight: 500;
  color: var(--accent-ink);
  letter-spacing: 0.02em;
}
[data-theme="dark"] .papers-see-all a { color: var(--accent); }
.papers-see-all a:hover {
  color: var(--ink);
  text-decoration: none;
}

/* ---------- All-papers index page ---------- */
.papers-index-head { padding-block: clamp(3rem, 6vw, 5rem) clamp(1.5rem, 3vw, 2.5rem); }
.papers-index-head .paper-eyebrow { margin: 0 0 clamp(1.5rem, 3vw, 2rem); }
.papers-index-list { padding-block: clamp(2rem, 4vw, 3.5rem) clamp(4rem, 7vw, 6rem); }