/* Public homepage */
:root {
  --navy: #13294b; --navy-2: #0d1d36; --gold: #c9a54c; --gold-2: #a8842f;
  --ink: #16202e; --ink-2: #47536a; --muted: #6c7890; --line: #e2e6ed; --tint: #f5f7fa; --paper: #ffffff;
  --serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --sans: Inter, system-ui, -apple-system, 'Segoe UI', sans-serif;
  --wrap: 1160px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
body { margin: 0; font: 16px/1.65 var(--sans); color: var(--ink); background: var(--paper); -webkit-font-smoothing: antialiased; }
a { color: var(--navy); }
img { display: block; }
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 28px; }
h1, h2, h3 { font-family: var(--serif); color: var(--navy); line-height: 1.2; margin: 0; }
h2 { font-size: clamp(28px, 3.2vw, 38px); font-weight: 600; }
.eyebrow { font: 600 12px/1 var(--sans); letter-spacing: .16em; text-transform: uppercase; color: var(--gold-2); margin: 0 0 14px; }
.eyebrow-light { color: var(--gold); }
.section-lede { color: var(--ink-2); max-width: 640px; margin: 12px 0 0; font-size: 17px; }

/* Buttons */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 11px 20px; border-radius: 8px; font: 600 14.5px var(--sans); text-decoration: none; border: 1px solid transparent; transition: background .15s, color .15s, border-color .15s; }
.btn-gold { background: var(--gold); color: var(--navy-2); }
.btn-gold:hover { background: #d6b55f; }
.btn-ghost-light { color: #fff; border-color: rgba(255,255,255,.35); }
.btn-ghost-light:hover { border-color: #fff; background: rgba(255,255,255,.06); }
.btn-outline { color: var(--navy); border-color: var(--navy); padding: 8px 16px; }
.btn-outline:hover { background: var(--navy); color: #fff; }

/* Header */
.site-header { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.96); border-bottom: 1px solid var(--line); backdrop-filter: saturate(1.2) blur(6px); }
.header-row { display: flex; align-items: center; justify-content: space-between; height: 70px; }
.logo { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.logo-text { display: flex; flex-direction: column; line-height: 1.15; }
.logo-text strong { font: 600 21px var(--serif); color: var(--navy); letter-spacing: .01em; }
.logo-text span { font: 600 10.5px var(--sans); letter-spacing: .14em; text-transform: uppercase; color: var(--muted); }
.site-nav { display: flex; align-items: center; gap: 28px; }
.site-nav a:not(.btn) { color: var(--ink-2); text-decoration: none; font-weight: 500; font-size: 14.5px; }
.site-nav a:not(.btn):hover { color: var(--navy); }
.nav-toggle { display: none; background: none; border: 0; font-size: 22px; color: var(--navy); cursor: pointer; }

/* Hero */
.hero { background: var(--navy); color: #fff; overflow: hidden; position: relative; }
.hero::after { content: ''; position: absolute; inset: auto 0 0 0; height: 4px; background: var(--gold); }
.hero-grid { display: grid; grid-template-columns: 1.25fr 1fr; gap: 40px; align-items: center; padding-top: 88px; padding-bottom: 96px; }
.hero h1 { color: #fff; font-size: clamp(34px, 4.6vw, 56px); font-weight: 600; letter-spacing: -.01em; }
.hero .eyebrow { color: var(--gold); }
.lede { font-size: 18.5px; color: #c9d3e3; max-width: 600px; margin: 22px 0 0; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 34px; }
.hero-art { width: 100%; max-width: 440px; justify-self: end; }
.net-lines path { fill: none; stroke: rgba(201,165,76,.55); stroke-width: 1.4; stroke-linejoin: round; }
.net-nodes circle { fill: #e9eef6; }
.net-nodes circle.hot { fill: var(--gold); }

/* Stats */
.stats { border-bottom: 1px solid var(--line); }
.stats-row { display: grid; grid-template-columns: repeat(var(--cols, 4), minmax(0, 1fr)); }
.stat { padding: 30px 24px 28px; border-right: 1px solid var(--line); }
.stat:last-child { border-right: 0; }
.stat-n { font: 600 38px/1 var(--serif); color: var(--navy); }
.stat-l { margin-top: 8px; font-size: 13.5px; color: var(--muted); }

/* Sections */
.section { padding: 96px 0; }
.section-tint { background: var(--tint); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-navy { background: var(--navy-2); color: #d5dceb; }
.section-navy h2, .section-navy h3 { color: #fff; }

/* Research areas */
.area-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; margin-top: 44px; }
.area { border: 1px solid var(--line); border-radius: 14px; padding: 30px 30px 26px; background: #fff; display: flex; flex-direction: column; gap: 12px; transition: border-color .15s, box-shadow .15s; }
.area:hover { border-color: #c8d1de; box-shadow: 0 10px 30px rgba(19,41,75,.07); }
.area-icon { width: 46px; height: 46px; border-radius: 10px; background: #eef2f8; display: grid; place-items: center; }
.area-icon svg { width: 26px; height: 26px; fill: none; stroke: var(--navy); stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.area h3 { font-size: 22px; font-weight: 600; }
.area p { margin: 0; color: var(--ink-2); }
.area ul { list-style: none; margin: 6px 0 0; padding: 14px 0 0; border-top: 1px solid var(--line); display: flex; flex-direction: column; gap: 8px; }
.area li { font-size: 14px; color: var(--ink); padding-left: 18px; position: relative; }
.area li::before { content: ''; position: absolute; left: 0; top: 9px; width: 8px; height: 2px; background: var(--gold); }

/* Abstracts */
.abstract-list { display: grid; gap: 16px; margin-top: 40px; }
.abstract { background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 24px 28px; }
.abstract-tags { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 10px; }
.tag { font: 600 11px/1 var(--sans); letter-spacing: .08em; text-transform: uppercase; padding: 6px 10px; border-radius: 999px; background: #eef2f8; color: var(--navy); }
.tag-status { background: #f6efdc; color: #7a5c14; }
.tag-status.accepted, .tag-status.presented, .tag-status.published { background: #e3f3ea; color: #1d6b42; }
.abstract h3 { font-size: 20px; font-weight: 600; line-height: 1.35; }
.abstract .authors { margin: 8px 0 0; font-size: 14px; color: var(--muted); }
.abstract details { margin-top: 12px; }
.abstract summary { cursor: pointer; font-weight: 600; font-size: 14px; color: var(--navy); list-style: none; display: inline-flex; align-items: center; gap: 6px; }
.abstract summary::-webkit-details-marker { display: none; }
.abstract summary::after { content: '+'; font-size: 16px; color: var(--gold-2); }
.abstract details[open] summary::after { content: '–'; }
.abstract details p { margin: 10px 0 0; color: var(--ink-2); max-width: 860px; }

/* Publications */
.pub-list { list-style: none; margin: 40px 0 0; padding: 0; border-top: 1px solid var(--line); counter-reset: pub; }
.pub { display: grid; grid-template-columns: 64px 1fr; gap: 18px; padding: 22px 0; border-bottom: 1px solid var(--line); }
.pub-year { font: 600 20px var(--serif); color: var(--gold-2); }
.pub-title { font: 600 18px/1.4 var(--serif); color: var(--navy); margin: 0; }
.pub-meta { margin: 6px 0 0; font-size: 14px; color: var(--muted); }
.pub-links { margin-top: 8px; display: flex; gap: 16px; font-size: 13.5px; font-weight: 600; }
.pub-empty { padding: 34px 0; color: var(--muted); border-bottom: 1px solid var(--line); }

/* About */
.about-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 64px; align-items: start; }
.about-text { font-size: 17.5px; margin: 18px 0 0; color: #c9d3e3; }
.pillars { display: grid; gap: 14px; }
.pillar { border: 1px solid rgba(255,255,255,.12); border-radius: 14px; padding: 22px 24px; display: grid; grid-template-columns: 46px 1fr; column-gap: 8px; }
.pillar-n { grid-row: span 2; font: 600 18px var(--serif); color: var(--gold); }
.pillar h3 { font-size: 19px; }
.pillar p { margin: 4px 0 0; font-size: 14.5px; color: #aebad0; }
.contact { margin-top: 56px; }
.contact-box { display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap; padding: 26px 30px; border-radius: 14px; background: rgba(201,165,76,.1); border: 1px solid rgba(201,165,76,.35); }
.contact-box h3 { font-size: 21px; }
.contact-box p { margin: 4px 0 0; color: #c9d3e3; font-size: 15px; }
.contact-actions { display: flex; gap: 10px; flex-wrap: wrap; }

/* Join page */
.join-hero { background: var(--navy); color: #fff; position: relative; }
.join-hero::after { content: ''; position: absolute; inset: auto 0 0 0; height: 4px; background: var(--gold); }
.join-hero .wrap { padding-top: 64px; padding-bottom: 60px; }
.join-hero h1 { color: #fff; font-size: clamp(32px, 4vw, 46px); font-weight: 600; }
.join-grid { display: grid; grid-template-columns: 1fr 1.6fr; gap: 56px; align-items: start; }
.join-side h2 { font-size: 24px; }
.join-side ul { list-style: none; padding: 0; margin: 18px 0 0; display: grid; gap: 14px; }
.join-side li { padding-left: 22px; position: relative; color: var(--ink-2); }
.join-side li::before { content: ''; position: absolute; left: 0; top: 11px; width: 10px; height: 2px; background: var(--gold); }
.apply { border: 1px solid var(--line); border-radius: 14px; padding: 32px; background: #fff; display: grid; gap: 18px; }
.apply-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.fld { display: grid; gap: 6px; }
.fld > span { font-weight: 600; font-size: 14px; color: var(--ink); }
.fld > span em { font-style: normal; color: var(--gold-2); }
.fld small { color: var(--muted); font-size: 12.5px; }
.fld input, .fld select, .fld textarea { font: 15px var(--sans); color: var(--ink); padding: 11px 12px; border: 1px solid #cfd6e1; border-radius: 8px; background: #fff; width: 100%; }
.fld textarea { min-height: 110px; resize: vertical; }
.fld input:focus, .fld select:focus, .fld textarea:focus { outline: none; border-color: var(--navy); box-shadow: 0 0 0 3px rgba(19,41,75,.12); }
.checks { display: flex; flex-wrap: wrap; gap: 8px; }
.checks label { display: inline-flex; align-items: center; gap: 8px; border: 1px solid #cfd6e1; border-radius: 999px; padding: 7px 14px; font-size: 14px; cursor: pointer; }
.checks label:has(input:checked) { border-color: var(--navy); background: #eef2f8; }
.hp { position: absolute; left: -9999px; }
.apply-foot { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.apply-foot .btn { border: 0; cursor: pointer; }
.apply-msg { font-size: 14.5px; }
.apply-msg.err { color: #b42318; }
.apply-done { border: 1px solid #b9dfc8; background: #f0faf4; border-radius: 14px; padding: 32px; }
.apply-done h2 { font-size: 26px; }
@media (max-width: 900px) { .join-grid { grid-template-columns: 1fr; gap: 32px; } }
@media (max-width: 560px) { .apply { padding: 22px 18px; } .apply-row { grid-template-columns: 1fr; } }

/* Footer */
.site-footer { background: var(--navy-2); border-top: 1px solid rgba(255,255,255,.08); color: #8f9bb3; }
.footer-row { display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap; padding-top: 28px; padding-bottom: 28px; }
.logo-footer .logo-text strong { color: #fff; font-size: 17px; }
.logo-footer .logo-text span { color: #8f9bb3; }
.footer-meta { margin: 0; font-size: 13.5px; }
.footer-meta a { color: #c9d3e3; }

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; padding-top: 56px; padding-bottom: 64px; }
  .hero-art { display: none; }
  .area-grid, .about-grid { grid-template-columns: 1fr; }
  .about-grid { gap: 36px; }
  .section { padding: 68px 0; }
  .site-nav { display: none; position: absolute; top: 70px; left: 0; right: 0; background: #fff; border-bottom: 1px solid var(--line); flex-direction: column; align-items: stretch; gap: 0; padding: 8px 16px 16px; }
  .site-nav.open { display: flex; }
  .site-nav a:not(.btn) { padding: 12px 4px; border-bottom: 1px solid var(--line); }
  .site-nav .btn { margin-top: 12px; justify-content: center; }
  .nav-toggle { display: block; }
  .stats-row { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stat { padding: 22px 18px; border-bottom: 1px solid var(--line); }
  .stat:nth-child(2n) { border-right: 0; }
  .stat:nth-last-child(-n+2) { border-bottom: 0; }
}
@media (max-width: 560px) {
  .wrap { padding: 0 16px; }
  .area, .abstract { padding: 22px 20px; }
  .pub { grid-template-columns: 1fr; gap: 4px; }
  .logo-text span { display: none; }
}
.fld-group { border: 0; padding: 0; margin: 0; min-width: 0; }