/* The Interest Alliance — institutional site */

:root {
  --ink: #1A2332;
  --paper: #F4F0E6;
  --paperAlt: #EAE4D3;
  --accent: #B8956A;
  --accentD: #8E7047;
  --petrol: #2A4A5C;
  --muted: #7A7362;
  --mutedD: #5F5B4F;
  --hair: #D6CFC0;
  --hairMuted: #C7BFAA;

  --f-display: Georgia, 'Times New Roman', 'Iowan Old Style', serif;
  --f-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --f-mono: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;

  --max: 1140px;
  --gutter: 32px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--f-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ---- Layout scaffolding ---- */
.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.rule {
  height: 1px;
  background: var(--hair);
  border: 0;
  margin: 0;
}

/* ---- Global masthead ---- */
.mast {
  border-bottom: 1px solid var(--hair);
  padding: 24px 0;
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 10;
}
.mast-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.brand {
  font-family: var(--f-display);
  font-size: 21px;
  font-weight: 400;
  letter-spacing: 0.02em;
  color: var(--ink);
  text-decoration: none;
  line-height: 1;
  white-space: nowrap;
}
.brand .brand-mark {
  color: var(--accent);
  font-style: italic;
}
.nav {
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.nav a {
  color: var(--petrol);
  text-decoration: none;
  padding: 4px 0;
  margin-left: 32px;
  border-bottom: 1px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
  display: inline-block;
}
.nav a:first-child { margin-left: 0; }
.nav a:hover,
.nav a.active {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

/* ---- Hero ---- */
.hero {
  padding: 96px 0 120px;
  border-bottom: 1px solid var(--hair);
}
.eyebrow {
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 32px;
  display: flex;
  align-items: center;
  gap: 16px;
}
.eyebrow::before {
  content: "";
  display: inline-block;
  width: 40px;
  height: 1px;
  background: var(--accent);
}
.hero h1 {
  font-family: var(--f-display);
  font-size: clamp(38px, 5vw, 58px);
  line-height: 1.12;
  font-weight: 400;
  letter-spacing: -0.015em;
  margin: 0 0 40px 0;
  max-width: 22ch;
  color: var(--ink);
}
.hero-lede {
  font-size: 20px;
  line-height: 1.55;
  max-width: 62ch;
  color: var(--petrol);
  margin: 0 0 72px 0;
}

/* ---- Horizon signature ---- */
.horizons {
  padding: 40px 0 0;
  border-top: 1px solid var(--hair);
  max-width: 780px;
}
.horizon {
  display: flex;
  align-items: baseline;
  padding: 20px 0;
  border-bottom: 1px solid var(--hairMuted);
}
.horizon:last-child { border-bottom: 0; padding-bottom: 0; }
.horizon-tag {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mutedD);
  width: 128px;
  flex-shrink: 0;
}
.horizon-body {
  flex: 1;
}
.horizon-label {
  font-family: var(--f-display);
  color: var(--ink);
  line-height: 1.2;
}
.horizon-1 .horizon-label { font-size: 18px; color: var(--muted); }
.horizon-2 .horizon-label { font-size: 24px; color: var(--petrol); }
.horizon-3 .horizon-label { font-size: 32px; color: var(--ink); font-weight: 500; }
.horizon-sub {
  display: block;
  font-family: var(--f-body);
  font-size: 14px;
  line-height: 1.5;
  color: var(--muted);
  margin-top: 6px;
  font-style: italic;
}

/* ---- Section spacing ---- */
.section {
  padding: 96px 0;
  border-bottom: 1px solid var(--hair);
}
.section:last-child { border-bottom: 0; }

.section-eyebrow {
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
}

.section-heading {
  font-family: var(--f-display);
  font-size: clamp(30px, 3.5vw, 40px);
  line-height: 1.2;
  font-weight: 400;
  letter-spacing: -0.01em;
  margin: 0 0 40px 0;
  max-width: 26ch;
  color: var(--ink);
}

/* ---- Focus areas grid ---- */
.focus-grid {
  display: flex;
  flex-wrap: wrap;
  margin: 24px -20px 0;
}
.focus-card {
  flex: 1 1 0;
  min-width: 260px;
  padding: 24px 20px 0;
  margin: 0 20px;
  border-top: 1px solid var(--ink);
}
.focus-num {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--accent);
  margin-bottom: 16px;
}
.focus-title {
  font-family: var(--f-display);
  font-size: 22px;
  line-height: 1.25;
  font-weight: 400;
  color: var(--ink);
  margin: 0 0 12px 0;
}
.focus-body {
  font-size: 15px;
  line-height: 1.6;
  color: var(--petrol);
  margin: 0;
}

/* ---- Prose columns (for thesis, approach) ---- */
.prose {
  max-width: 68ch;
}
.prose p {
  margin: 0 0 22px 0;
  font-size: 17px;
  line-height: 1.7;
  color: var(--ink);
}
.prose p.lede {
  font-size: 21px;
  line-height: 1.55;
  color: var(--petrol);
  margin-bottom: 40px;
  font-family: var(--f-display);
  font-style: italic;
  font-weight: 400;
}
.prose h2 {
  font-family: var(--f-display);
  font-size: 28px;
  font-weight: 400;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 56px 0 20px 0;
  padding-top: 32px;
  border-top: 1px solid var(--hair);
}
.prose h3 {
  font-family: var(--f-display);
  font-style: italic;
  font-size: 20px;
  font-weight: 400;
  color: var(--petrol);
  margin: 32px 0 12px 0;
}
.prose .callout {
  border-left: 2px solid var(--accent);
  padding: 6px 0 6px 24px;
  margin: 32px 0;
  font-family: var(--f-display);
  font-size: 19px;
  line-height: 1.5;
  color: var(--ink);
  font-style: italic;
}

/* ---- Principles list ---- */
.principles {
  display: flex;
  flex-wrap: wrap;
  margin: 40px -28px;
}
.principle {
  flex: 1 1 300px;
  min-width: 260px;
  margin: 0 28px 40px;
  padding-top: 20px;
  border-top: 1px solid var(--hair);
}
.principle-num {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--accent);
  margin-bottom: 12px;
}
.principle-title {
  font-family: var(--f-display);
  font-style: normal;
  font-size: 20px;
  line-height: 1.3;
  color: var(--ink);
  margin: 0 0 10px 0;
}
.principle-body {
  font-size: 15px;
  line-height: 1.6;
  color: var(--petrol);
  margin: 0;
}

/* ---- Reference models card set ---- */
.models {
  display: flex;
  flex-wrap: wrap;
  margin: 40px -16px;
}
.model {
  flex: 1 1 260px;
  min-width: 240px;
  margin: 0 16px 32px;
  padding: 28px 24px;
  background: var(--paperAlt);
  border-left: 2px solid var(--accent);
}
.model-name {
  font-family: var(--f-display);
  font-size: 22px;
  color: var(--ink);
  margin: 0 0 6px 0;
  line-height: 1.2;
}
.model-tag {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accentD);
  margin-bottom: 16px;
}
.model-body {
  font-size: 14px;
  line-height: 1.55;
  color: var(--petrol);
  margin: 0;
}

/* ---- Contact ---- */
.contact-block {
  display: flex;
  flex-wrap: wrap;
  margin: 32px -40px 0;
}
.contact-column {
  flex: 1 1 380px;
  min-width: 320px;
  padding: 0 40px;
  margin-bottom: 40px;
}
.contact-card {
  padding-top: 32px;
  border-top: 1px solid var(--ink);
}
.contact-name {
  font-family: var(--f-display);
  font-size: 28px;
  line-height: 1.2;
  color: var(--ink);
  margin: 0 0 4px 0;
  font-weight: 400;
}
.contact-title {
  font-family: var(--f-body);
  font-size: 15px;
  color: var(--petrol);
  margin: 0 0 32px 0;
  font-style: italic;
}
.contact-line {
  display: flex;
  padding: 14px 0;
  border-bottom: 1px solid var(--hair);
  align-items: baseline;
}
.contact-line:last-child { border-bottom: 0; }
.contact-label {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  width: 100px;
  flex-shrink: 0;
}
.contact-value {
  font-size: 16px;
  color: var(--ink);
  flex: 1;
}
.contact-value a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--hair);
  padding-bottom: 1px;
  transition: border-color 0.15s ease;
}
.contact-value a:hover {
  border-bottom-color: var(--accent);
}

.contact-narrative {
  font-family: var(--f-display);
  font-size: 17px;
  line-height: 1.65;
  color: var(--petrol);
  font-style: italic;
  max-width: 42ch;
}

/* ---- Footer ---- */
.foot {
  padding: 48px 0;
  border-top: 1px solid var(--hair);
  background: var(--paperAlt);
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mutedD);
}
.foot-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}
.foot-right {
  display: inline-block;
}
.foot a {
  color: var(--mutedD);
  text-decoration: none;
  margin-left: 32px;
  transition: color 0.15s ease;
}
.foot a:first-child { margin-left: 0; }
.foot a:hover { color: var(--ink); }

/* ---- Responsive ---- */
@media (max-width: 780px) {
  :root { --gutter: 24px; }
  .nav a { margin-left: 20px; font-size: 11px; letter-spacing: 0.12em; }
  .focus-card, .principle, .model { flex-basis: 100%; }
  .hero { padding: 72px 0 88px; }
  .section { padding: 72px 0; }
  .horizon-tag { width: 100px; }
  .horizon-3 .horizon-label { font-size: 26px; }
  .horizon-2 .horizon-label { font-size: 20px; }
  .horizon-1 .horizon-label { font-size: 16px; }
}
@media (max-width: 560px) {
  .mast { padding: 16px 0; }
  .mast-inner { flex-direction: column; align-items: flex-start; gap: 14px; }
  .brand { font-size: 18px; }
  .nav { gap: 16px; }
  .hero h1 { font-size: 34px; }
  .hero-lede { font-size: 17px; }
  .foot-inner { flex-direction: column; align-items: flex-start; }
}

/* ---- Accessibility ---- */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0s !important; transition-duration: 0s !important; }
}