:root {
  --primary: #0d5eba;
  --primary-dark: #093f7c;
  --accent: #3fa152;
  --highlight: #ffcb05;
  --surface: #ffffff;
  --ink: #000000;
  --muted: #606060;
  --line: #d4d4d4;
  --bg-soft: #f4f8ff;
  --bg-deep: #021b3f;
  --radius-lg: 18px;
  --radius-md: 12px;
  --shadow-soft: 0 16px 40px rgba(4, 31, 62, 0.12);
  --shadow-card: 0 8px 20px rgba(9, 63, 124, 0.12);
  --max-width: 1180px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Nunito Sans", Helvetica, Arial, sans-serif;
  color: var(--ink);
  line-height: 1.6;
  background: radial-gradient(circle at 2% 15%, rgba(13, 94, 186, 0.14) 0%, transparent 35%),
    radial-gradient(circle at 98% 88%, rgba(63, 161, 82, 0.14) 0%, transparent 32%),
    linear-gradient(180deg, #ffffff 0%, #f6f9ff 48%, #f3f8f3 100%);
}

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

a {
  color: var(--primary-dark);
}

a:hover {
  color: var(--primary);
}

.sr-only {
  border: 0;
  clip: rect(0 0 0 0);
  height: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  position: absolute;
  width: 1px;
}

.skip-link {
  position: absolute;
  left: 10px;
  top: -40px;
  background: var(--primary);
  color: #fff;
  padding: 8px 12px;
  z-index: 1000;
  text-decoration: none;
  border-radius: 8px;
}

.skip-link:focus {
  top: 10px;
}

.container {
  width: min(var(--max-width), 92%);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(8px);
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid rgba(13, 94, 186, 0.12);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 78px;
  gap: 1rem;
}

.brand-lockup {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  text-decoration: none;
  color: var(--ink);
}

.brand-lockup img {
  width: 42px;
  height: 42px;
  object-fit: contain;
}

.brand-text strong {
  display: block;
  font-family: "Barlow", "Nunito Sans", sans-serif;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand-text span {
  display: block;
  font-size: 0.84rem;
  color: var(--muted);
}

.menu-toggle {
  border: 1px solid rgba(13, 94, 186, 0.2);
  background: #fff;
  color: var(--primary-dark);
  border-radius: 10px;
  padding: 0.55rem 0.8rem;
  font-weight: 700;
  display: none;
}

.primary-nav ul {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
}

.primary-nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 0.48rem 0.7rem;
  text-decoration: none;
  font-weight: 700;
  font-size: 0.92rem;
  letter-spacing: 0.01em;
  color: var(--primary-dark);
  border: 1px solid transparent;
  transition: all 0.22s ease;
}

.primary-nav a:hover {
  border-color: rgba(13, 94, 186, 0.25);
  background: rgba(13, 94, 186, 0.08);
}

.primary-nav a.is-active {
  background: var(--primary);
  color: #fff;
}

.primary-nav a.nav-external {
  border-color: rgba(255, 203, 5, 0.55);
  background: rgba(255, 203, 5, 0.14);
}

.hero {
  padding: 4.3rem 0 3.2rem;
}

.hero-panel {
  position: relative;
  overflow: hidden;
  border-radius: calc(var(--radius-lg) + 6px);
  box-shadow: var(--shadow-soft);
  background: linear-gradient(125deg, rgba(2, 27, 63, 0.9), rgba(13, 94, 186, 0.86)),
    url("../assets/symposia/hero-students.jpg") center/cover no-repeat;
  color: #fff;
  padding: clamp(1.5rem, 4vw, 3rem);
}

.hero-panel::after {
  content: "";
  position: absolute;
  width: 240px;
  height: 240px;
  border-radius: 999px;
  background: radial-gradient(circle, rgba(255, 203, 5, 0.38), rgba(255, 203, 5, 0));
  right: -40px;
  top: -40px;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.3);
  padding: 0.38rem 0.8rem;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 800;
}

.hero h1 {
  font-family: "Barlow", "Nunito Sans", sans-serif;
  font-size: clamp(2rem, 5vw, 3.7rem);
  line-height: 1.06;
  margin: 0.9rem 0 0.7rem;
  letter-spacing: 0.01em;
}

.hero p {
  font-size: clamp(1rem, 2vw, 1.18rem);
  max-width: 70ch;
  margin: 0;
}

.hero-cta-row {
  margin-top: 1.4rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  font-weight: 800;
  letter-spacing: 0.01em;
  text-decoration: none;
  padding: 0.72rem 1rem;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: transform 0.2s ease, background 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--highlight);
  color: #111;
}

.btn-primary:hover {
  background: #ffd84c;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.18);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.35);
}

.btn-ghost {
  background: #fff;
  color: var(--primary-dark);
  border-color: rgba(13, 94, 186, 0.25);
}

.stat-grid {
  margin-top: 1.2rem;
  display: grid;
  gap: 0.8rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.stat-card {
  border: 1px solid rgba(255, 255, 255, 0.25);
  background: rgba(255, 255, 255, 0.14);
  border-radius: var(--radius-md);
  padding: 0.9rem;
}

.stat-card strong {
  display: block;
  font-size: 1rem;
  font-weight: 900;
}

.stat-card span {
  display: block;
  font-size: 0.91rem;
}

.section {
  padding: 2.8rem 0;
}

.section h2 {
  margin: 0 0 0.65rem;
  font-family: "Barlow", "Nunito Sans", sans-serif;
  font-size: clamp(1.6rem, 3vw, 2.35rem);
  line-height: 1.18;
}

.section-intro {
  margin: 0 0 1.5rem;
  max-width: 76ch;
  color: var(--muted);
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.card {
  background: #fff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-card);
  padding: 1rem;
}

.card h3 {
  margin-top: 0.2rem;
  margin-bottom: 0.4rem;
  font-family: "Barlow", "Nunito Sans", sans-serif;
  font-size: 1.2rem;
}

.card p {
  margin: 0;
  color: #2f2f2f;
}

.pill {
  display: inline-flex;
  border-radius: 999px;
  border: 1px solid rgba(13, 94, 186, 0.25);
  color: var(--primary-dark);
  background: rgba(13, 94, 186, 0.08);
  font-weight: 800;
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.34rem 0.66rem;
}

.timeline {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.85rem;
}

.timeline li {
  background: #fff;
  border: 1px solid var(--line);
  border-left: 5px solid var(--primary);
  border-radius: var(--radius-md);
  padding: 0.9rem 0.95rem;
  box-shadow: var(--shadow-card);
}

.timeline strong {
  font-size: 1.03rem;
}

.track-grid,
.offerings-grid,
.year-grid,
.project-grid {
  display: grid;
  gap: 1rem;
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.track-grid,
.offerings-grid,
.year-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.project-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.track-card,
.offering-card,
.year-card,
.project-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: #fff;
  box-shadow: var(--shadow-card);
  padding: 1rem;
}

.video-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: #fff;
  box-shadow: var(--shadow-card);
  padding: 1rem;
}

.video-card h3 {
  margin: 0 0 0.6rem;
  font-family: "Barlow", "Nunito Sans", sans-serif;
  font-size: 1.03rem;
}

.video-frame {
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #000;
  aspect-ratio: 16 / 9;
}

.video-frame iframe {
  width: 100%;
  height: 100%;
  border: 0;
  display: block;
}

.video-meta {
  margin: 0.55rem 0 0;
}

.track-card h3,
.offering-card h3,
.year-card h3,
.project-card h3 {
  margin: 0 0 0.45rem;
  font-family: "Barlow", "Nunito Sans", sans-serif;
}

.track-card p,
.offering-card p,
.year-card p,
.project-card p {
  margin: 0;
  color: #2f2f2f;
}

.keynote-block {
  display: grid;
  grid-template-columns: 170px 1fr;
  gap: 1rem;
  align-items: center;
}

.keynote-photo {
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #fff;
}

.callout {
  border-radius: var(--radius-lg);
  border: 1px solid rgba(13, 94, 186, 0.2);
  background: linear-gradient(140deg, rgba(13, 94, 186, 0.08), rgba(63, 161, 82, 0.06));
  padding: 1rem;
}

.callout strong {
  font-family: "Barlow", "Nunito Sans", sans-serif;
}

.year-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin: 0 0 1rem;
}

.year-filter button {
  border: 1px solid rgba(13, 94, 186, 0.3);
  border-radius: 999px;
  background: #fff;
  color: var(--primary-dark);
  padding: 0.45rem 0.8rem;
  font-weight: 800;
  cursor: pointer;
}

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

.year-card img {
  border-radius: 12px;
  width: 100%;
  height: 220px;
  object-fit: cover;
  margin-bottom: 0.75rem;
}

.year-links,
.special-links,
.directory-list,
.footer-links,
.social-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.year-links,
.special-links {
  margin-top: 0.8rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.year-links a,
.special-links a {
  text-decoration: none;
  font-weight: 700;
  font-size: 0.9rem;
  border: 1px solid rgba(13, 94, 186, 0.22);
  border-radius: 999px;
  padding: 0.35rem 0.68rem;
  background: rgba(13, 94, 186, 0.06);
}

.faq details {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  padding: 0.7rem 0.85rem;
  margin-bottom: 0.7rem;
}

.faq summary {
  cursor: pointer;
  font-weight: 800;
  color: var(--primary-dark);
}

.faq p {
  margin-bottom: 0;
}

.directory {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: #fff;
  box-shadow: var(--shadow-card);
  padding: 1rem;
}

.directory details + details {
  margin-top: 0.75rem;
}

.directory summary {
  font-weight: 800;
  cursor: pointer;
}

.directory-list li {
  margin-top: 0.45rem;
  overflow-wrap: anywhere;
}

.site-footer {
  margin-top: 2.2rem;
  border-top: 1px solid rgba(13, 94, 186, 0.2);
  background: linear-gradient(180deg, #0a2a58 0%, #072147 100%);
  color: #fff;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 1rem;
  padding: 2rem 0;
}

.footer-brand {
  max-width: 48ch;
}

.footer-brand h2 {
  margin-top: 0;
  margin-bottom: 0.55rem;
  font-family: "Barlow", "Nunito Sans", sans-serif;
}

.footer-links li,
.social-links li {
  margin-bottom: 0.38rem;
}

.footer-links a,
.social-links a {
  color: #dce8ff;
  text-decoration: none;
}

.footer-links a:hover,
.social-links a:hover {
  color: #fff;
  text-decoration: underline;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  padding: 0.8rem 0;
  font-size: 0.9rem;
  color: #d3e3ff;
}

.notice {
  border-left: 4px solid var(--highlight);
  background: rgba(255, 203, 5, 0.13);
  padding: 0.8rem;
  border-radius: 10px;
  margin: 1rem 0 0;
}

.abstract-form {
  display: grid;
  gap: 0.85rem;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
}

.abstract-form label {
  display: grid;
  gap: 0.35rem;
  font-weight: 700;
  font-size: 0.93rem;
  color: #1b2a3e;
}

.abstract-form input,
.abstract-form select,
.abstract-form textarea {
  width: 100%;
  border: 1px solid rgba(13, 94, 186, 0.25);
  border-radius: 10px;
  padding: 0.62rem 0.7rem;
  font: inherit;
  color: #1e1e1e;
  background: #fff;
}

.abstract-form textarea {
  resize: vertical;
  min-height: 140px;
}

.abstract-form input:focus,
.abstract-form select:focus,
.abstract-form textarea:focus {
  outline: 3px solid rgba(13, 94, 186, 0.18);
  border-color: var(--primary);
}

.form-span-2 {
  grid-column: 1 / -1;
}

.form-meta {
  color: var(--muted);
  font-size: 0.88rem;
}

.form-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.form-status {
  margin: 0;
  font-size: 0.92rem;
  color: var(--primary-dark);
}

@media (max-width: 1060px) {
  .grid-3,
  .track-grid,
  .offerings-grid,
  .year-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .keynote-block {
    grid-template-columns: 1fr;
  }

  .keynote-photo {
    max-width: 220px;
  }

  .footer-inner {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 820px) {
  .menu-toggle {
    display: inline-flex;
  }

  .primary-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 78px;
    background: #fff;
    border-bottom: 1px solid rgba(13, 94, 186, 0.18);
    box-shadow: 0 10px 24px rgba(4, 31, 62, 0.12);
    display: none;
  }

  .primary-nav.open {
    display: block;
  }

  .primary-nav ul {
    flex-direction: column;
    align-items: stretch;
    padding: 0.75rem;
  }

  .primary-nav a {
    justify-content: flex-start;
  }

  .stat-grid,
  .grid-2,
  .grid-3,
  .track-grid,
  .offerings-grid,
  .year-grid,
  .video-grid,
  .project-grid,
  .footer-inner {
    grid-template-columns: 1fr;
  }

  .form-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 3rem;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .hero-panel,
  .card,
  .track-card,
  .offering-card,
  .year-card,
  .project-card {
    animation: rise-in 0.65s ease both;
  }

  @keyframes rise-in {
    from {
      opacity: 0;
      transform: translateY(10px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
}