/* FALCON project site — NYU color theme */
:root {
  --violet: #57068c;        /* NYU Violet */
  --violet-deep: #330662;   /* Deep violet */
  --violet-ultra: #8900e1;  /* Ultra violet */
  --violet-light: #eee6f3;  /* Light violet tint */
  --violet-mid: #c9b3d9;
  --ink: #1d1626;
  --ink-soft: #4a4257;
  --muted: #6d6578;
  --line: #e4dde9;
  --bg: #ffffff;
  --bg-alt: #f7f4f9;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(30, 10, 50, .06), 0 8px 24px rgba(30, 10, 50, .08);
  --maxw: 1140px;
  --font: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-display: "Source Serif 4", Georgia, serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--violet); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--violet-ultra); }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- Header / nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, .94);
  backdrop-filter: saturate(160%) blur(8px);
  border-top: 4px solid var(--violet);
  border-bottom: 1px solid var(--line);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--ink); }
.brand-mark {
  width: 38px; height: 38px; border-radius: 9px;
  background: var(--violet); display: grid; place-items: center;
}
.brand-mark svg { width: 24px; height: 24px; }
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-name { font-weight: 800; letter-spacing: .08em; font-size: 19px; color: var(--violet); }
.brand-sub { font-size: 11.5px; color: var(--muted); letter-spacing: .04em; text-transform: uppercase; }

.nav-links { display: flex; gap: 6px; list-style: none; margin: 0; padding: 0; }
.nav-links a {
  display: block; padding: 8px 16px; border-radius: 8px;
  text-decoration: none; color: var(--ink-soft); font-weight: 600; font-size: 15px;
}
.nav-links a:hover { background: var(--violet-light); color: var(--violet); }
.nav-links a[aria-current="page"] { color: var(--violet); background: var(--violet-light); }

.nav-toggle {
  display: none; background: none; border: 1px solid var(--line); border-radius: 8px;
  width: 42px; height: 42px; cursor: pointer; color: var(--violet);
}
.nav-toggle svg { width: 22px; height: 22px; margin: auto; }

@media (max-width: 720px) {
  .nav-toggle { display: grid; place-items: center; }
  .nav-links {
    display: none; position: absolute; left: 0; right: 0; top: 72px;
    flex-direction: column; background: #fff; padding: 8px 16px 16px;
    border-bottom: 1px solid var(--line); box-shadow: var(--shadow);
  }
  .nav-links.open { display: flex; }
  .brand-sub { display: none; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden; color: #fff;
  background:
    radial-gradient(1200px 500px at 85% -10%, rgba(137, 0, 225, .55), transparent 60%),
    radial-gradient(800px 400px at 0% 110%, rgba(137, 0, 225, .25), transparent 60%),
    linear-gradient(135deg, var(--violet-deep) 0%, var(--violet) 70%);
  padding: 88px 0 180px;
}
.hero::after { /* subtle signal-wave texture */
  content: ""; position: absolute; inset: 0; pointer-events: none; opacity: .12;
  background-image: repeating-radial-gradient(circle at 90% 20%, #fff 0 1px, transparent 1px 38px);
}
.hero .container { position: relative; z-index: 1; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase;
  padding: 6px 12px; border-radius: 999px;
  background: rgba(255, 255, 255, .12); border: 1px solid rgba(255, 255, 255, .25);
}
.hero h1 {
  font-size: clamp(54px, 9vw, 96px); line-height: 1; margin: 24px 0 12px;
  letter-spacing: .06em; font-weight: 800;
}
.hero .tagline {
  font-family: var(--font-display); font-size: clamp(21px, 2.6vw, 28px);
  margin: 0 0 22px; color: #f1e6fa; max-width: 760px; line-height: 1.35;
}
.hero .tagline b { color: #fff; font-weight: 700; }
.hero .lede { font-size: 18.5px; max-width: 700px; color: rgba(255, 255, 255, .86); margin: 0 0 32px; }
.btn-row { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 12px 22px; border-radius: 10px;
  font-weight: 700; font-size: 15.5px; text-decoration: none; transition: transform .15s, background .15s;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: #fff; color: var(--violet); }
.btn-primary:hover { color: var(--violet-deep); }
.btn-ghost { color: #fff; border: 1px solid rgba(255, 255, 255, .45); }
.btn-ghost:hover { background: rgba(255, 255, 255, .1); color: #fff; }

/* Architecture figure overlapping the hero */
.figure-wrap { margin-top: -130px; position: relative; z-index: 2; }
.figure-card {
  background: #fff; border-radius: 18px; box-shadow: 0 20px 60px rgba(40, 6, 70, .22);
  padding: 28px 28px 20px; border: 1px solid var(--line);
}
.figure-scroll { overflow-x: auto; }
.figure-card svg { width: 100%; min-width: 640px; height: auto; display: block; }
.figure-card figcaption { font-size: 14.5px; color: var(--muted); margin-top: 14px; text-align: center; }

/* Overview video */
.video-frame {
  aspect-ratio: 16 / 9; max-width: 900px; border-radius: 18px; overflow: hidden;
  background: var(--violet-deep); box-shadow: 0 20px 60px rgba(40, 6, 70, .22);
}
.video-frame iframe { width: 100%; height: 100%; border: 0; display: block; }

/* ---------- Page header (inner pages) ---------- */
.page-hero {
  color: #fff; padding: 64px 0 56px;
  background:
    radial-gradient(900px 300px at 90% -20%, rgba(137, 0, 225, .5), transparent 60%),
    linear-gradient(135deg, var(--violet-deep), var(--violet));
}
.page-hero h1 { margin: 10px 0 8px; font-size: clamp(36px, 5vw, 50px); line-height: 1.1; }
.page-hero p { margin: 0; color: rgba(255, 255, 255, .85); max-width: 720px; font-size: 18px; }
.page-hero .eyebrow { font-size: 12px; }

/* ---------- Sections ---------- */
section { padding: 80px 0; }
.section-alt { background: var(--bg-alt); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-label {
  font-size: 13px; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; color: var(--violet-ultra);
  margin: 0 0 10px;
}
h2 { font-size: clamp(30px, 3.6vw, 40px); line-height: 1.15; margin: 0 0 18px; color: var(--violet-deep); }
h3 { font-size: 20px; line-height: 1.3; margin: 0 0 8px; color: var(--ink); }
.section-intro { color: var(--ink-soft); max-width: 760px; font-size: 18px; margin: 0 0 40px; }

.two-col { display: grid; grid-template-columns: 1.15fr 1fr; gap: 56px; align-items: start; }
@media (max-width: 900px) { .two-col { grid-template-columns: 1fr; gap: 32px; } }
.prose p { margin: 0 0 16px; color: var(--ink-soft); }
.prose strong { color: var(--ink); }

.callout {
  border-left: 4px solid var(--violet); background: var(--violet-light); border-radius: 0 var(--radius) var(--radius) 0;
  padding: 22px 26px; font-family: var(--font-display); font-size: 19px; line-height: 1.5; color: var(--violet-deep);
}
.callout em { font-style: normal; font-weight: 700; color: var(--violet); }

.pill-list { display: grid; gap: 14px; }
.pill {
  display: flex; gap: 16px; align-items: flex-start; background: #fff; border: 1px solid var(--line);
  border-radius: var(--radius); padding: 18px 20px;
}
.pill .icon {
  flex: none; width: 44px; height: 44px; border-radius: 11px; background: var(--violet-light);
  color: var(--violet); display: grid; place-items: center;
}
.pill .icon svg { width: 24px; height: 24px; }
.pill h3 { font-size: 17px; margin-bottom: 4px; }
.pill p { margin: 0; font-size: 15.5px; color: var(--ink-soft); }

/* Use-case cards */
.cards-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
@media (max-width: 760px) { .cards-2 { grid-template-columns: 1fr; } }
.cards-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
@media (max-width: 860px) { .cards-3 { grid-template-columns: 1fr; } }
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px; box-shadow: var(--shadow);
}
.card .tag {
  display: inline-block; font-size: 12px; font-weight: 800; letter-spacing: .1em; text-transform: uppercase;
  color: var(--violet); background: var(--violet-light); padding: 4px 10px; border-radius: 999px; margin-bottom: 14px;
}
.card p { margin: 0; color: var(--ink-soft); font-size: 16px; }
.card .partners { margin-top: 14px; font-size: 14px; color: var(--muted); }

/* Thrusts */
.thrusts { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
@media (max-width: 860px) { .thrusts { grid-template-columns: 1fr; } }
.thrust {
  position: relative; background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px 28px 26px; box-shadow: var(--shadow); overflow: hidden;
}
.thrust::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 5px;
  background: linear-gradient(90deg, var(--violet), var(--violet-ultra));
}
.thrust-num {
  font-size: 13px; font-weight: 800; letter-spacing: .14em; color: var(--violet-ultra); text-transform: uppercase;
}
.thrust h3 { font-size: 22px; margin: 6px 0 10px; color: var(--violet-deep); }
.thrust > p { margin: 0 0 16px; color: var(--ink-soft); font-size: 16px; }
.subthrusts { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line); }
.subthrusts li {
  display: flex; justify-content: space-between; gap: 16px; padding: 10px 0; border-bottom: 1px solid var(--line);
  font-size: 15px;
}
.subthrusts li span:first-child { font-weight: 600; color: var(--ink); }
.subthrusts li span:last-child { color: var(--muted); text-align: right; white-space: nowrap; }
@media (max-width: 480px) {
  .subthrusts li { flex-direction: column; gap: 2px; }
  .subthrusts li span:last-child { text-align: left; }
}

/* Keywords */
.keywords { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 24px; }
.keywords span {
  font-size: 13.5px; font-weight: 600; color: var(--violet); background: #fff;
  border: 1px solid var(--violet-mid); padding: 5px 12px; border-radius: 999px;
}

/* ---------- Team ---------- */
.org-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
@media (max-width: 900px) { .org-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .org-grid { grid-template-columns: 1fr; } }
.org {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
  display: flex; flex-direction: column; box-shadow: var(--shadow);
}
.org-logo {
  height: 120px; display: grid; place-items: center; padding: 20px 28px;
  background: #fff; border-bottom: 1px solid var(--line);
}
.org-logo.dark { background: var(--violet-deep); }
.org-logo img.padded-logo { max-height: 110px; } /* square logos with built-in whitespace */
.org-logo img { max-height: 76px; max-width: 100%; width: auto; object-fit: contain; }
.org-logo.wordmark span {
  font-weight: 800; font-size: 22px; letter-spacing: .02em; color: var(--violet-deep); text-align: center; line-height: 1.15;
}
.org-logo.wordmark small { display: block; font-size: 11px; letter-spacing: .14em; color: var(--muted); font-weight: 700; margin-top: 4px; }
.org-body { padding: 18px 20px 20px; flex: 1; }
.org-type {
  font-size: 11.5px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; color: var(--violet-ultra);
}
.org-body h3 { font-size: 18px; margin: 4px 0 6px; }
.org-body p { margin: 0; font-size: 14.5px; color: var(--ink-soft); }

.org-section { margin-top: 56px; }
.org-section-head {
  display: flex; align-items: center; gap: 16px; padding-bottom: 14px; margin-bottom: 20px;
  border-bottom: 2px solid var(--violet-light);
}
.org-section-head img { height: 40px; width: auto; }
.org-section-head .mini-wordmark {
  height: 40px; min-width: 40px; padding: 0 10px; border-radius: 8px; background: var(--violet-light);
  color: var(--violet); font-weight: 800; display: grid; place-items: center; font-size: 14px;
}
.org-section-head h3 { margin: 0; font-size: 22px; color: var(--violet-deep); }
.org-section-head .count { margin-left: auto; color: var(--muted); font-size: 14px; }

.people { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 16px; }
@media (max-width: 400px) { .people { grid-template-columns: 1fr; } }
.person {
  display: flex; gap: 16px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 18px;
}
.avatar {
  flex: none; width: 56px; height: 56px; border-radius: 50%;
  background: linear-gradient(135deg, var(--violet), var(--violet-ultra));
  color: #fff; display: grid; place-items: center; font-weight: 800; font-size: 18px; letter-spacing: .03em;
}
.person h4 { margin: 0; font-size: 17px; }
.role-badge {
  display: inline-block; font-size: 11.5px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase;
  padding: 2px 8px; border-radius: 6px; margin: 4px 0 8px; background: var(--violet-light); color: var(--violet);
}
.role-badge.lead { background: var(--violet); color: #fff; }
.person p { margin: 0; font-size: 14.5px; color: var(--ink-soft); line-height: 1.5; }

/* ---------- Publications ---------- */
.empty-state {
  text-align: center; border: 2px dashed var(--violet-mid); border-radius: 18px; padding: 64px 24px;
  background: var(--bg-alt);
}
.empty-state .icon {
  width: 64px; height: 64px; margin: 0 auto 18px; border-radius: 16px; background: var(--violet-light);
  color: var(--violet); display: grid; place-items: center;
}
.empty-state .icon svg { width: 32px; height: 32px; }
.empty-state h2 { font-size: 26px; margin-bottom: 8px; }
.empty-state p { color: var(--ink-soft); margin: 0 auto; max-width: 560px; }

.pub-list { list-style: none; padding: 0; margin: 0; }
.pub { padding: 18px 0; border-bottom: 1px solid var(--line); }
.pub .title { font-weight: 700; }
.pub .authors, .pub .venue { color: var(--ink-soft); font-size: 15.5px; }

/* ---------- News ---------- */
.news-list { list-style: none; padding: 0; margin: 0; }
.news-item {
  display: grid; grid-template-columns: 130px 1fr; gap: 24px; padding: 24px 0; border-bottom: 1px solid var(--line);
}
.news-item:first-child { padding-top: 0; }
.news-item time { font-weight: 700; color: var(--violet); font-size: 15px; padding-top: 2px; }
.news-source {
  font-size: 12px; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; color: var(--violet-ultra);
}
.news-item h3 { margin: 4px 0 6px; }
.news-item h3 a { color: var(--ink); text-decoration: none; }
.news-item h3 a:hover { color: var(--violet); text-decoration: underline; }
.news-item p { margin: 0; color: var(--ink-soft); font-size: 16px; }
@media (max-width: 600px) { .news-item { grid-template-columns: 1fr; gap: 4px; } }

/* ---------- Footer ---------- */
.site-footer { background: var(--violet-deep); color: rgba(255, 255, 255, .78); padding: 48px 0 36px; font-size: 15px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 32px; align-items: start; }
@media (max-width: 720px) { .footer-grid { grid-template-columns: 1fr; } }
.site-footer h4 { color: #fff; margin: 0 0 8px; font-size: 16px; letter-spacing: .06em; }
.site-footer p { margin: 0 0 8px; }
.site-footer a { color: #fff; }
.footer-links { list-style: none; padding: 0; margin: 0; display: flex; gap: 20px; flex-wrap: wrap; }
.footer-bottom { border-top: 1px solid rgba(255, 255, 255, .15); margin-top: 32px; padding-top: 18px; font-size: 13.5px; }

@media (max-width: 600px) {
  body { font-size: 16px; }
  .container { padding: 0 16px; }
  section { padding: 56px 0; }
  .hero { padding: 64px 0 150px; }
  .figure-card { padding: 14px 10px 12px; }
}