:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --surface-2: #eef3f8;
  --text: #10213d;
  --text-soft: #42516b;
  --brand: #0b1f3a;
  --accent: #1f4f8a;
  --highlight: #8faed1;
  --border: #d7e0ea;
  --shadow: 0 10px 30px rgba(7, 28, 59, 0.1);
  --radius: 16px;
}

html[data-theme="dark"] {
  --bg: #071120;
  --surface: #0e1b2f;
  --surface-2: #14253f;
  --text: #f3f7fc;
  --text-soft: #c7d3e2;
  --brand: #e6eef8;
  --accent: #5f8fc9;
  --highlight: #aac3e2;
  --border: #1f3350;
  --shadow: 0 14px 36px rgba(0, 0, 0, 0.45);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Outfit", "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 90% -10%, rgba(31, 79, 138, 0.18), transparent 40%),
    radial-gradient(circle at 0% 10%, rgba(143, 174, 209, 0.22), transparent 35%),
    var(--bg);
  color: var(--text);
  line-height: 1.6;
}

img, iframe { max-width: 100%; }
a { color: var(--accent); text-decoration-thickness: 1.5px; }
a:hover { text-decoration: none; }

.container { width: min(1120px, 92%); margin: 0 auto; }
.section { padding: 4.5rem 0; }
.section h2 {
  font-size: clamp(1.7rem, 3vw, 2.3rem);
  margin: 0 0 1rem;
  color: var(--brand);
}
.section-intro { color: var(--text-soft); margin-top: 0; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: 0.75rem 1rem;
  z-index: 999;
}
.skip-link:focus { left: 0.5rem; top: 0.5rem; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: color-mix(in srgb, var(--bg) 84%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-wrap {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  min-height: 72px;
}
.brand { display: inline-flex; align-items: center; gap: 0.6rem; text-decoration: none; color: var(--brand); font-weight: 700; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(130deg, var(--accent), var(--highlight));
  color: #fff;
  font-weight: 800;
}
.brand-text { font-size: 0.95rem; }

.site-nav {
  margin-left: auto;
  display: none;
  flex-direction: column;
  width: 100%;
  padding: 0.5rem 0 1rem;
}
.site-nav.open { display: flex; }
.site-nav a {
  color: var(--text-soft);
  text-decoration: none;
  padding: 0.45rem 0;
  font-weight: 500;
}
.site-nav a.active { color: var(--accent); }

.nav-toggle {
  margin-left: auto;
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  padding: 0.5rem;
}
.nav-toggle span { width: 18px; height: 2px; background: var(--text); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0.7rem 1.1rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn:focus-visible, a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, summary:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent), white 15%);
  outline-offset: 2px;
}
.btn-primary { background: linear-gradient(120deg, var(--accent), color-mix(in srgb, var(--accent), #fff 20%)); color: #fff; box-shadow: var(--shadow); }
.btn-secondary { background: var(--surface); color: var(--brand); border-color: var(--border); }
.btn-ghost { background: transparent; border-color: var(--border); color: var(--text); }
.icon-btn { width: 40px; height: 40px; padding: 0; }

.hero-grid { display: grid; gap: 1.4rem; align-items: start; }
.eyebrow { text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-soft); font-size: 0.79rem; font-weight: 600; }
h1 {
  margin: 0;
  font-size: clamp(2rem, 6vw, 3.3rem);
  line-height: 1.08;
  color: var(--brand);
  font-family: "Instrument Serif", Georgia, serif;
  font-style: italic;
}
.hero-subtitle { font-size: clamp(1rem, 2.8vw, 1.2rem); color: var(--text-soft); max-width: 58ch; }
.hero-meta p { margin: 0.3rem 0; }
.btn-row { display: flex; flex-wrap: wrap; gap: 0.65rem; margin: 1rem 0 1.2rem; }
.open-banner {
  display: inline-flex;
  border-radius: 999px;
  padding: 0.35rem 0.9rem;
  border: 1px solid color-mix(in srgb, var(--highlight), transparent 55%);
  background: color-mix(in srgb, var(--highlight), transparent 88%);
  color: color-mix(in srgb, var(--text), var(--highlight) 35%);
  font-weight: 600;
  font-size: 0.92rem;
}

.hero-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.5rem 0.7rem 0.35rem;
  box-shadow: var(--shadow);
}
.hero-card img {
  display: block;
  width: min(100%, 400px);
  margin: 0 auto;
  border-radius: 14px;
  border: 1px solid var(--border);
  aspect-ratio: 5 / 4;
  object-position: center top;
  object-fit: cover;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  box-shadow: var(--shadow);
}
.card h3 { margin-top: 0; color: var(--brand); }
.icon-label {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}
.icon {
  width: 1.05rem;
  height: 1.05rem;
  flex: 0 0 auto;
  vertical-align: -0.125em;
}
.icon-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}
.visual-strip figure { margin: 0; }
.visual-strip img { border-radius: 12px; border: 1px solid var(--border); }
.visual-strip figcaption { margin-top: 0.55rem; font-weight: 600; color: var(--text-soft); }

.two-col { display: grid; gap: 1rem; }
.card-grid { display: grid; gap: 1rem; }
.three, .four, .two { grid-template-columns: 1fr; }

.chip-list, .badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  margin: 0.35rem 0 0;
  padding: 0;
  list-style: none;
}
.chip, .badge {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  padding: 0.22rem 0.58rem;
  font-size: 0.78rem;
  font-weight: 600;
}
.badge {
  background: color-mix(in srgb, var(--accent), transparent 88%);
  border-color: color-mix(in srgb, var(--accent), transparent 70%);
}

.timeline {
  display: grid;
  gap: 0.9rem;
  margin-bottom: 1rem;
}
.year {
  margin: 0;
  color: var(--highlight);
  font-weight: 700;
}
.membership-list {
  display: grid;
  gap: 0.7rem;
  margin-top: 0.5rem;
}
.membership-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.65rem 0.8rem;
}
.membership-head {
  display: flex;
  gap: 0.7rem;
  justify-content: space-between;
  align-items: baseline;
}
.membership-item h4 {
  margin: 0;
  color: var(--brand);
  font-size: 1rem;
}
.membership-cred {
  margin: 0;
  color: var(--text-soft);
  white-space: nowrap;
}
.membership-meta {
  margin: 0.18rem 0 0;
  color: var(--text-soft);
}

.section-head { margin-bottom: 1rem; }
.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}
.filter-chip { cursor: pointer; }
.filter-chip.active {
  background: var(--accent);
  color: #fff;
  border-color: transparent;
}

.talk {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}
.video-frame {
  position: relative;
  width: 100%;
  border-radius: 12px;
  overflow: hidden;
  background: linear-gradient(120deg, color-mix(in srgb, var(--accent), #000 25%), color-mix(in srgb, var(--brand), #000 10%));
}
.video-frame::before {
  content: "";
  display: block;
  padding-top: 56.25%;
}
.video-frame iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}
.video-frame::after {
  content: "▶";
  position: absolute;
  right: 0.7rem;
  bottom: 0.5rem;
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.9);
  pointer-events: none;
}

.pub-list {
  display: grid;
  gap: 0.8rem;
  padding-left: 1.2rem;
}
.pub-list span { color: var(--text-soft); font-size: 0.9rem; }

.steps { padding-left: 1rem; }
.steps li { margin-bottom: 0.5rem; }
.tags, .muted { color: var(--text-soft); font-size: 0.92rem; }

.copy-status { min-height: 1.2rem; margin-bottom: 0; }

.site-footer {
  border-top: 1px solid var(--border);
  padding: 1rem 0 1.7rem;
}
.footer-wrap {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  color: var(--text-soft);
}
.footer-wrap p { margin: 0; }

.back-top {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}
.back-top.show { opacity: 1; pointer-events: auto; }

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}
.reveal.visible { opacity: 1; transform: none; }

@media (min-width: 760px) {
  .nav-toggle { display: none; }
  .site-nav {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 0.8rem;
    width: auto;
    margin-left: auto;
    padding: 0;
  }
  .site-nav a { padding: 0.2rem 0.1rem; }
  .hero-grid, .two-col { grid-template-columns: 1.25fr 1fr; gap: 1.1rem; }
  .three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .four { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .contact-cards { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer-wrap { flex-direction: row; justify-content: space-between; align-items: center; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
  .reveal { opacity: 1; transform: none; }
}