/* ===== CUSTOM PROPERTIES ===== */
:root {
  --bg: #f9f7f3;
  --bg-alt: #efeae3;
  --bg-dark: #0e2240;
  --text: #1d1811;
  --text-sec: #685e54;
  --text-inv: #e8e1d8;
  --accent: #c95818;
  --accent-d: #a34412;
  --navy: #0e2240;
  --border: #dbd3c7;
  --border-d: rgba(255,255,255,.1);
  --max-w: 1100px;
}

/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1.0625rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4 {
  font-family: Georgia, "Times New Roman", serif;
  font-weight: normal;
  line-height: 1.2;
  color: var(--navy);
}
h1 { font-size: clamp(2.2rem, 5.5vw, 3.75rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.25rem); }
h3 { font-size: clamp(1.1rem, 2.5vw, 1.4rem); }
p { margin-bottom: 1.2em; }
p:last-child { margin-bottom: 0; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-d); text-decoration: underline; }
strong { font-weight: 600; color: var(--navy); }
em { font-style: italic; }

/* ===== UTILITY ===== */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--accent);
  color: #fff;
  padding: .5rem 1rem;
  z-index: 200;
  border-radius: 0 0 4px 4px;
  font-size: .875rem;
}
.skip-link:focus { top: 0; }

/* ===== NAVIGATION ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-dark);
}

.site-header .container {
  display: flex;
  align-items: center;
  height: 3.5rem;
}

.logo {
  font-family: Georgia, serif;
  font-size: 1.2rem;
  color: var(--text-inv);
  text-decoration: none;
  letter-spacing: .01em;
  flex-shrink: 0;
  margin-right: auto;
}
.logo:hover { color: #fff; text-decoration: none; }

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}
.site-nav a {
  color: rgba(232,225,216,.7);
  font-size: .9375rem;
  text-decoration: none;
  transition: color .15s;
}
.site-nav a:hover { color: var(--text-inv); text-decoration: none; }
.site-nav .aria-current, .site-nav [aria-current="page"] {
  color: var(--text-inv);
}

.nav-apply {
  background: var(--accent);
  color: #fff !important;
  padding: .4rem 1rem;
  border-radius: 4px;
  font-weight: 500;
}
.nav-apply:hover { background: var(--accent-d) !important; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2.25rem;
  height: 2.25rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: .25rem;
}
.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--text-inv);
  border-radius: 1px;
  transition: .2s;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-block;
  padding: .7rem 1.5rem;
  border-radius: 4px;
  font-size: .9375rem;
  font-weight: 500;
  cursor: pointer;
  transition: background .15s, color .15s, border-color .15s;
  text-decoration: none;
  border: 1.5px solid transparent;
}
.btn-primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn-primary:hover { background: var(--accent-d); border-color: var(--accent-d); color: #fff; text-decoration: none; }
.btn-ghost { background: transparent; color: var(--navy); border-color: var(--navy); }
.btn-ghost:hover { background: var(--navy); color: var(--text-inv); text-decoration: none; }
.btn-ghost-inv { background: transparent; color: #fff; border-color: rgba(255,255,255,.6); }
.btn-ghost-inv:hover { background: rgba(255,255,255,.12); color: #fff; text-decoration: none; }

/* ===== HERO ===== */
.hero {
  padding: 5.5rem 0 4.5rem;
  border-bottom: 1px solid var(--border);
}
.hero-eyebrow {
  font-size: .8125rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--text-sec);
  margin-bottom: 1.25rem;
}
.hero h1 { margin-bottom: 1.5rem; letter-spacing: -.02em; }
.hero-text {
  max-width: 48ch;
  font-size: 1.1rem;
  color: var(--text-sec);
  margin-bottom: 2.25rem;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 1rem; }

/* ===== STATS ===== */
.stats-strip {
  background: var(--navy);
  padding: 2.75rem 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}
.stat-n {
  font-family: Georgia, serif;
  font-size: 3rem;
  line-height: 1;
  color: #fff;
  font-style: italic;
  display: block;
  margin-bottom: .35rem;
}
.stat-l {
  font-size: .8125rem;
  color: rgba(232,225,216,.55);
  line-height: 1.5;
}

/* ===== SECTION BASE ===== */
.section { padding: 5rem 0; }
.section-alt { background: var(--bg-alt); }
.section-dark { background: var(--navy); }
.section-dark h2,
.section-dark h3 { color: var(--text-inv); }
.section-dark p { color: rgba(232,225,216,.75); }

.section-label {
  display: block;
  font-size: .75rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: .6rem;
}
.section-intro {
  max-width: 54ch;
  color: var(--text-sec);
  margin-top: .75rem;
}

/* ===== THE BET ===== */
.bet-layout {
  display: grid;
  grid-template-columns: 5fr 4fr;
  gap: 5rem;
  align-items: start;
}
.bet-headline {
  font-size: clamp(1.6rem, 3.8vw, 2.6rem);
  margin-bottom: 1.25rem;
}
.bet-pullquote {
  border-left: 3px solid var(--accent);
  padding-left: 1.25rem;
  font-size: 1.05rem;
  font-style: italic;
  color: var(--navy);
  line-height: 1.55;
  margin: 1.75rem 0;
}
.bet-cta { margin-top: 1.5rem; }

/* ===== AGENDA ===== */
.agenda-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border-top: 1px solid var(--border);
  margin-top: 2.5rem;
}
.agenda-item {
  padding: 1.75rem 2rem 1.75rem 0;
  border-bottom: 1px solid var(--border);
}
.agenda-item:nth-child(even) {
  padding-left: 2rem;
  padding-right: 0;
  border-left: 1px solid var(--border);
}
.agenda-item h3 {
  font-size: 1.0625rem;
  margin-bottom: .45rem;
}
.agenda-item p {
  font-size: .9375rem;
  color: var(--text-sec);
  margin: 0;
}

/* ===== PAPERS ===== */
.papers-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 2rem;
  gap: 1rem;
  flex-wrap: wrap;
}
.papers-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}
.paper-card {
  border: 1px solid var(--border);
  padding: 1.5rem;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  gap: .6rem;
  transition: border-color .15s;
}
.paper-card:hover { border-color: var(--accent); }
.paper-tag {
  font-size: .6875rem;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--accent);
  font-weight: 600;
}
.paper-title {
  font-family: Georgia, serif;
  font-size: 1.05rem;
  color: var(--navy);
  line-height: 1.35;
}
.paper-desc {
  font-size: .875rem;
  color: var(--text-sec);
  flex: 1;
  margin: 0;
  line-height: 1.55;
}
.paper-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: .8125rem;
  color: var(--text-sec);
  margin-top: .25rem;
  padding-top: .75rem;
  border-top: 1px solid var(--border);
}
.paper-id { font-family: ui-monospace, monospace; color: var(--accent); }

/* ===== OPEN SCIENCE ===== */
.principles-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem 3rem;
  margin-top: 2.5rem;
}
.principle {
  border-top: 1px solid rgba(255,255,255,.12);
  padding-top: 1.25rem;
}
.principle h3 {
  font-size: 1.0625rem;
  margin-bottom: .45rem;
}

/* ===== PROGRAMS ===== */
.programs-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-top: 2.5rem;
}
.program-card {
  border: 1px solid var(--border);
  padding: 2rem;
  background: var(--bg);
}
.program-card h3 { font-size: 1.2rem; margin-bottom: .2rem; }
.program-tagline {
  font-style: italic;
  color: var(--text-sec);
  font-family: Georgia, serif;
  font-size: .9375rem;
  margin-bottom: .9rem;
}
.program-body {
  font-size: .9375rem;
  color: var(--text-sec);
  margin-bottom: .9rem;
}
.program-meta {
  font-size: .8125rem;
  color: var(--accent);
  font-weight: 600;
  letter-spacing: .03em;
  margin-bottom: 1rem;
}
.program-link {
  display: inline-flex;
  align-items: center;
  gap: .2rem;
  color: var(--navy);
  font-size: .875rem;
  font-weight: 500;
  text-decoration: none;
}
.program-link:hover { color: var(--accent); text-decoration: none; }
.program-link::after { content: " →"; }

/* ===== CTA BANNER ===== */
.cta-banner {
  background: var(--accent);
  padding: 4.5rem 0;
}
.cta-banner .container { display: flex; align-items: center; gap: 3rem; justify-content: space-between; flex-wrap: wrap; }
.cta-banner h2 { color: #fff; margin-bottom: .5rem; }
.cta-banner p { color: rgba(255,255,255,.85); max-width: 46ch; margin: 0; }
.cta-actions { display: flex; gap: 1rem; flex-wrap: wrap; flex-shrink: 0; }

/* ===== FOOTER ===== */
.site-footer {
  background: var(--navy);
  padding: 3.5rem 0 2rem;
  color: rgba(232,225,216,.55);
  font-size: .875rem;
}
.footer-top {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 3rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--border-d);
  margin-bottom: 2rem;
}
.footer-brand {
  font-family: Georgia, serif;
  font-size: 1.2rem;
  color: var(--text-inv);
  text-decoration: none;
  display: block;
  margin-bottom: .6rem;
}
.footer-brand:hover { color: #fff; text-decoration: none; }
.footer-tagline { color: rgba(232,225,216,.45); max-width: 34ch; line-height: 1.6; }

.footer-cols { display: flex; gap: 3.5rem; }
.footer-col h4 {
  font-size: .6875rem;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: rgba(232,225,216,.4);
  font-family: system-ui, sans-serif;
  font-weight: 600;
  margin-bottom: .8rem;
}
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: .45rem; }
.footer-col a {
  color: rgba(232,225,216,.6);
  font-size: .875rem;
  text-decoration: none;
}
.footer-col a:hover { color: var(--text-inv); text-decoration: none; }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: .8125rem;
  color: rgba(232,225,216,.35);
}
.footer-legal { display: flex; gap: 1.25rem; }
.footer-legal a { color: rgba(232,225,216,.4); text-decoration: none; font-size: .8125rem; }
.footer-legal a:hover { color: rgba(232,225,216,.7); text-decoration: none; }

/* ===== PAGE HERO (inner pages) ===== */
.page-hero {
  padding: 3.5rem 0 3rem;
  border-bottom: 1px solid var(--border);
}
.breadcrumb {
  font-size: .875rem;
  color: var(--text-sec);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: .4rem;
}
.breadcrumb a { color: var(--text-sec); text-decoration: none; }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb span { opacity: .45; }
.page-desc {
  max-width: 52ch;
  font-size: 1.1rem;
  color: var(--text-sec);
  margin-top: .75rem;
}

/* ===== ABOUT PAGE ===== */
.about-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 5rem;
  align-items: start;
  padding: 4rem 0;
}
.prose h2 {
  font-size: 1.5rem;
  margin: 2.5rem 0 .9rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border);
}
.prose h2:first-child { margin-top: 0; padding-top: 0; border-top: none; }
.prose h3 { font-size: 1.05rem; margin: 1.25rem 0 .4rem; }
.prose ul { padding-left: 1.25em; margin-bottom: 1.25em; }
.prose li { margin-bottom: .4em; }
.prose .inline-link { color: var(--navy); font-weight: 500; text-decoration: underline; }
.prose .inline-link:hover { color: var(--accent); }

.sidebar { position: sticky; top: 5rem; }
.sidebar-block {
  border: 1px solid var(--border);
  padding: 1.4rem;
  margin-bottom: 1.25rem;
}
.sidebar-block h4 {
  font-size: .6875rem;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--text-sec);
  font-family: system-ui, sans-serif;
  font-weight: 600;
  margin-bottom: .75rem;
}
.sidebar-block ul { list-style: none; display: flex; flex-direction: column; gap: .4rem; }
.sidebar-block a { font-size: .9rem; color: var(--navy); text-decoration: none; }
.sidebar-block a:hover { color: var(--accent); }

.what-we-dont {
  background: var(--bg-alt);
  padding: 3.5rem 0;
}
.dont-list {
  list-style: none;
  border-top: 1px solid var(--border);
  margin-top: 1.5rem;
}
.dont-list li {
  padding: .9rem 0;
  border-bottom: 1px solid var(--border);
  color: var(--text-sec);
  font-size: .9375rem;
  padding-left: 1.25rem;
  position: relative;
}
.dont-list li::before {
  content: "×";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

/* ===== CONTACT PAGE ===== */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  padding: 4rem 0;
}
.contact-list { list-style: none; border-top: 1px solid var(--border); }
.contact-item {
  display: grid;
  grid-template-columns: 9rem 1fr;
  gap: .5rem 1rem;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--border);
  align-items: start;
}
.contact-label { font-size: .8125rem; color: var(--text-sec); padding-top: .1rem; line-height: 1.5; }
.contact-email {
  font-weight: 500;
  color: var(--navy);
  text-decoration: none;
  font-size: .9375rem;
  word-break: break-all;
}
.contact-email:hover { color: var(--accent); }

.newsletter-box {
  border: 1px solid var(--border);
  padding: 2rem;
  margin-top: 2rem;
}
.newsletter-box h3 { font-size: 1.2rem; margin-bottom: .5rem; }
.newsletter-box p { font-size: .9375rem; color: var(--text-sec); margin-bottom: 1.25rem; }
.newsletter-cta {
  display: inline-block;
  background: var(--navy);
  color: var(--text-inv);
  padding: .65rem 1.5rem;
  border-radius: 4px;
  font-size: .9375rem;
  font-weight: 500;
  text-decoration: none;
}
.newsletter-cta:hover { background: var(--accent); color: #fff; text-decoration: none; }

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .bet-layout,
  .about-layout { grid-template-columns: 1fr; gap: 2.5rem; }
  .sidebar { position: static; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .papers-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-top { grid-template-columns: 1fr; }
  .footer-cols { flex-wrap: wrap; gap: 2rem; }
  .contact-layout { grid-template-columns: 1fr; gap: 3rem; }
}

@media (max-width: 640px) {
  .nav-toggle { display: flex; }
  .site-nav {
    display: none;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    position: absolute;
    top: 3.5rem;
    left: 0; right: 0;
    background: var(--bg-dark);
    padding: .75rem 1.5rem 1.25rem;
    border-bottom: 1px solid rgba(255,255,255,.06);
    box-shadow: 0 8px 24px rgba(0,0,0,.3);
  }
  .site-nav.is-open { display: flex; }
  .site-nav a {
    width: 100%;
    padding: .65rem 0;
    border-bottom: 1px solid rgba(255,255,255,.05);
  }
  .nav-apply { border-bottom: none !important; margin-top: .5rem; }

  .hero { padding: 3.25rem 0 3rem; }
  .hero-actions { flex-direction: column; align-items: flex-start; }

  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
  .stat-n { font-size: 2.25rem; }

  .agenda-list { grid-template-columns: 1fr; }
  .agenda-item:nth-child(even) { padding-left: 0; border-left: none; }

  .papers-grid { grid-template-columns: 1fr; }
  .papers-header { align-items: flex-start; }

  .principles-grid { grid-template-columns: 1fr; }
  .programs-grid { grid-template-columns: 1fr; }

  .cta-banner .container { flex-direction: column; gap: 2rem; }
  .cta-actions { width: 100%; }

  .footer-cols { flex-direction: column; gap: 1.5rem; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }

  .contact-layout { padding: 2.5rem 0; }
  .contact-item { grid-template-columns: 1fr; gap: .15rem; }
  .contact-label { font-size: .75rem; }

  .about-layout { padding: 2.5rem 0; }

  .section { padding: 3.5rem 0; }
  h1 { font-size: 2rem; }
}