/* Strategy Science 2026 – CU Boulder Leeds
   Editorial / academic. Warm paper, ink, CU gold accent. */

:root {
  --paper: #F8F5EE;
  --paper-2: #EFEAD9;
  --ink: #1B1A18;
  --ink-2: #3A3936;
  --ink-3: #6E6A60;
  --rule: #D9D2C2;
  --rule-soft: #E8E2D2;
  --gold: #CFB87C;
  --gold-deep: #A89455;
  --black: #000000;
  --serif: "Source Serif 4", "Source Serif Pro", "Iowan Old Style", Georgia, serif;
  --sans: "Source Sans 3", "Source Sans Pro", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --shadow: 0 1px 0 var(--rule);
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }
body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  font-size: 16px;
  line-height: 1.55;
  font-feature-settings: "ss01", "kern";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration: none; }
a:hover { color: var(--gold-deep); }

/* ––– Top utility bar (CU-style black) ––– */
.cu-bar {
  background: #000;
  color: #fff;
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.02em;
}
.cu-bar .row {
  max-width: 1440px;
  margin: 0 auto;
  padding: 12px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.cu-bar .brand { display: flex; align-items: center; gap: 14px; font-size: 13px; }
.cu-bar a { color: #fff; opacity: 0.8; }
.cu-bar a:hover { opacity: 1; color: var(--gold); }
.cu-bar .brand .cu-logo { display: inline-flex; align-items: center; }
.cu-bar .brand .cu-logo img { height: 26px; width: auto; display: block; }

/* Leeds lockup in main site header */
.site-header .leeds-mark { display: inline-flex; align-items: center; flex-shrink: 0; }
.site-header .leeds-mark img { height: 56px; width: auto; display: block; }
@media (max-width: 700px) { .site-header .leeds-mark img { height: 44px; } }
.cu-bar nav { display: flex; gap: 22px; font-size: 12px; }

/* ––– Site header ––– */
.site-header {
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
}
.site-header .row {
  max-width: 1440px;
  margin: 0 auto;
  padding: 22px 32px 18px;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 32px;
  flex-wrap: wrap;
}
.site-header .lockup {
  display: flex; flex-direction: column; gap: 4px;
  padding-left: 28px; border-left: 1px solid var(--rule);
}
.site-header .eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--ink-3);
}
.site-header h1 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(28px, 3vw, 36px);
  line-height: 1.05;
  letter-spacing: -0.01em;
  margin: 0;
}
.site-header h1 a:hover { color: inherit; }
.site-header .meta {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--ink-2);
  display: flex;
  gap: 18px;
  align-items: center;
  flex-wrap: wrap;
  margin-left: auto;
}
.site-header .meta .dot { width: 6px; height: 6px; background: var(--gold); border-radius: 50%; display: inline-block; }

.primary-nav {
  border-top: 1px solid var(--rule);
  border-bottom: 3px double var(--rule);
  background: var(--paper);
}
.primary-nav .row {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  gap: 0;
}
.primary-nav a {
  font-family: var(--sans);
  font-size: 15px;
  letter-spacing: -0.005em;
  font-weight: 600;
  color: var(--ink-2);
  padding: 14px 22px 14px 0;
  margin-right: 22px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: color .15s ease;
}
.primary-nav a:hover { color: var(--ink); }
.primary-nav a[aria-current="page"] {
  color: var(--ink);
  border-bottom-color: var(--gold);
}
.primary-nav a .num {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-3);
  letter-spacing: 0.04em;
  font-weight: 400;
}

/* ––– Layout containers ––– */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 32px;
}
.narrow {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 32px;
}

/* ––– Footer ––– */
.site-footer {
  margin-top: 0;
  border-top: 0;
  background: var(--ink);
  color: #C8C4BA;
  font-size: 13px;
}
.site-footer .row {
  max-width: 1280px;
  margin: 0 auto;
  padding: 48px 32px 36px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
}
.site-footer h4 {
  font-family: var(--serif);
  font-size: 16px;
  letter-spacing: -0.005em;
  font-weight: 600;
  color: var(--gold);
  margin: 0 0 14px;
}
.site-footer a { color: #C8C4BA; display: block; padding: 3px 0; }
.site-footer a:hover { color: #fff; }
.site-footer .credit {
  border-top: 1px solid #2A2825;
  margin-top: 32px;
  padding: 18px 0 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.01em;
  color: #6E6A60;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
}
@media (max-width: 800px) {
  .site-footer .row { grid-template-columns: 1fr 1fr; }
}

/* ––– Buttons ––– */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 22px;
  font-family: var(--sans);
  font-size: 14px;
  letter-spacing: -0.005em;
  font-weight: 600;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  cursor: pointer;
  transition: all .15s ease;
}
.btn:hover { background: var(--gold-deep); border-color: var(--gold-deep); color: #fff; }
.btn.ghost { background: transparent; color: var(--ink); }
.btn.ghost:hover { background: var(--ink); color: var(--paper); }
.btn .arr { font-family: var(--mono); }

/* ––– Type helpers ––– */
.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--ink-3);
}
.kicker {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--ink-2);
  display: flex;
  align-items: center;
  gap: 10px;
}
.kicker::before {
  content: "";
  width: 32px; height: 1px; background: var(--gold-deep);
}
h2.section-title {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(28px, 3.4vw, 44px);
  line-height: 1.1;
  letter-spacing: -0.015em;
  margin: 12px 0 18px;
}
h3.sub-title {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 22px;
  line-height: 1.2;
  margin: 0 0 8px;
}

/* ––– Print ––– */
@media print {
  .cu-bar, .primary-nav, .site-footer, .program-controls, .no-print { display: none !important; }
  body { background: #fff; color: #000; }
  .site-header { border-bottom: 1.5pt solid #000; }
  a { color: #000; text-decoration: none; }
  .program-grid { page-break-inside: avoid; }
  .session-card { break-inside: avoid; }
}