:root {
  --bg: #ffffff;
  --bg-alt: #f4f7fb;
  --text: #1c2430;
  --muted: #5d6b7a;
  --brand: #002d72;
  --brand-2: #2f6db2;
  --accent: #00a676;
  --line: #dce4ef;
  --card: #ffffff;
  --shadow: 0 16px 40px rgba(0, 45, 114, 0.12);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

a { color: var(--brand-2); text-decoration: none; font-weight: 650; }
a:hover { text-decoration: underline; }

code {
  background: #eef4fb;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.1rem 0.35rem;
}

pre {
  overflow-x: auto;
  background: #0f172a;
  color: #e2e8f0;
  border-radius: 16px;
  padding: 1.2rem;
  box-shadow: var(--shadow);
}

pre code {
  background: transparent;
  border: 0;
  padding: 0;
  color: inherit;
}

.hero {
  min-height: 72vh;
  background:
    radial-gradient(circle at 10% 20%, rgba(0,166,118,0.18), transparent 30%),
    radial-gradient(circle at 90% 10%, rgba(47,109,178,0.22), transparent 34%),
    linear-gradient(135deg, #f8fbff 0%, #eef5ff 100%);
  border-bottom: 1px solid var(--line);
}

.nav {
  max-width: 1160px;
  margin: 0 auto;
  padding: 1.2rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  color: var(--brand);
  font-weight: 850;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.95rem;
}

.nav-links a { color: var(--text); font-weight: 650; }

.hero-content {
  max-width: 980px;
  margin: 0 auto;
  padding: 5rem 1.25rem 6rem;
  text-align: center;
}

.eyebrow {
  margin: 0 0 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--accent);
  font-weight: 850;
  font-size: 0.82rem;
}

h1 {
  margin: 0;
  color: var(--brand);
  font-size: clamp(2.3rem, 6vw, 5rem);
  line-height: 1.04;
  letter-spacing: -0.06em;
}

.subtitle {
  max-width: 780px;
  margin: 1.5rem auto 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.35rem);
}

.button-row {
  margin-top: 2rem;
  display: flex;
  justify-content: center;
  gap: 0.9rem;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.82rem 1.1rem;
  border-radius: 999px;
  border: 1px solid var(--brand-2);
  color: var(--brand);
  background: #fff;
  box-shadow: 0 8px 20px rgba(0,45,114,0.08);
}

.button.primary {
  background: var(--brand);
  color: #fff;
  border-color: var(--brand);
}

.note {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 1.25rem;
}

.section {
  max-width: 1160px;
  margin: 0 auto;
  padding: 4.5rem 1.25rem;
}

.section.alt {
  max-width: none;
  background: var(--bg-alt);
  padding-left: max(1.25rem, calc((100vw - 1160px) / 2 + 1.25rem));
  padding-right: max(1.25rem, calc((100vw - 1160px) / 2 + 1.25rem));
}

h2 {
  color: var(--brand);
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  line-height: 1.15;
  letter-spacing: -0.04em;
  margin: 0 0 1rem;
}

h3 { color: var(--brand); line-height: 1.25; margin-top: 0; }

.cards, .materials-grid {
  display: grid;
  gap: 1rem;
  margin-top: 1.75rem;
}

.cards.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.materials-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.card, .material {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 1.35rem;
  box-shadow: 0 10px 30px rgba(0,45,114,0.06);
}

.timeline {
  display: grid;
  gap: 1rem;
  margin-top: 1.5rem;
}

.slot {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 1rem;
  align-items: start;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 1.25rem;
}

.slot.break { background: #fafff7; border-color: rgba(0,166,118,0.28); }

.time {
  color: var(--accent);
  font-weight: 850;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.9rem;
}

.details ul { margin-bottom: 0; padding-left: 1.25rem; }

.link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1rem;
}

.link-row a {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.45rem 0.75rem;
  background: #f8fbff;
}

.speaker {
  text-align: center;
}

.speaker-photo {
  width: 180px;
  height: 180px;
  min-width: 180px;
  min-height: 180px;
  max-width: 180px;
  max-height: 180px;

  display: block;
  margin: 0 auto 1rem auto;

  object-fit: cover;
  object-position: center;

  border-radius: 50%;
  border: 4px solid #fff;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  margin: 0 auto 1rem;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: #fff;
  font-weight: 850;
}

.speaker-affiliation {
  font-size: 0.92rem;
  line-height: 1.45;
  color: #555;
  margin-top: 0.5rem;
}

.speaker h3 {
  margin-bottom: 0.6rem;
}

.resource-list { padding-left: 1.25rem; }
.footer {
  border-top: 1px solid var(--line);
  text-align: center;
  color: var(--muted);
  padding: 2rem 1rem;
  background: #fff;
}

/* ==========================================
   Graphical Abstract
   ========================================== */

.graphical-abstract {
    max-width: 900px;      /* match overview text width */
    margin: 2rem auto 0 auto;
    text-align: center;
}

.graphical-abstract img {
    width: 100%;
    height: auto;
    display: block;

    /* optional */
    border-radius: 8px;

    /* remove card-like styling */
    padding: 0;
    background: transparent;
    box-shadow: none;
}

.legend-sampling {
    color: #8BC34A;
    font-weight: 600;
}

.legend-model {
    color: #B39DDB;
    font-weight: 600;
}

.legend-loss {
    color: #E57373;
    font-weight: 600;
}

.legend-prior {
    color: #64B5F6;
    font-weight: 600;
}

.figure-caption {
    margin-top: 0.75rem;
    font-size: 0.95rem;
    line-height: 1.5;
    color: #666;
}

.figure-caption {
    margin-top: 1rem;
    font-size: 0.95rem;
    color: #666;
    line-height: 1.5;
}

@media (max-width: 820px) {
  .nav { align-items: flex-start; flex-direction: column; }
  .cards.three, .materials-grid { grid-template-columns: 1fr; }
  .slot { grid-template-columns: 1fr; }
  .hero-content { padding-top: 3rem; }
}