:root {
  color-scheme: light;
  --bg: #f6f7fb;
  --ink: #111827;
  --muted: #5b6675;
  --accent: #1f5bff;
  --accent-2: #0f3f9e;
  --card: #ffffff;
  --stroke: rgba(17, 24, 39, 0.12);
  --shadow: 0 18px 40px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "IBM Plex Sans", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  min-height: 100vh;
}

.grain {
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120' viewBox='0 0 120 120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='120' height='120' filter='url(%23n)' opacity='.08'/%3E%3C/svg%3E");
  pointer-events: none;
  mix-blend-mode: multiply;
  opacity: 0.25;
  z-index: 0;
}

.hero {
  position: relative;
  padding: 110px 8vw 100px;
  overflow: hidden;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  z-index: 3;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  padding: 18px 8vw;
  background: rgba(246, 247, 251, 0.98);
  border-bottom: 1px solid var(--stroke);
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.06);
  backdrop-filter: blur(12px);
}

.brand {
  font-family: "Bodoni Moda", serif;
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  font-size: 0.9rem;
}

.nav-links a {
  text-decoration: none;
  color: var(--ink);
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: border-color 0.2s ease;
}

.nav-links a:hover {
  border-color: var(--accent);
}

.hero-content {
  margin-top: 70px;
  max-width: 680px;
  position: relative;
  z-index: 2;
  animation: fadeUp 0.9s ease forwards;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 0.75rem;
  color: var(--accent-2);
  font-weight: 600;
  margin-bottom: 12px;
}

.hero h1 {
  font-family: "Bodoni Moda", serif;
  font-size: clamp(2.6rem, 5vw, 4.4rem);
  line-height: 1.05;
  margin: 0 0 18px;
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--muted);
  margin-bottom: 26px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--ink);
}

.hero-meta span {
  padding: 6px 12px;
  background: #ffffff;
  border-radius: 999px;
  border: 1px solid var(--stroke);
}

.hero-shapes span {
  position: absolute;
  border-radius: 50%;
  opacity: 0.2;
  filter: blur(0.5px);
  animation: float 16s ease-in-out infinite;
}

.hero-shapes span:nth-child(1) {
  width: 280px;
  height: 280px;
  background: #dbe6ff;
  top: -120px;
  right: -80px;
}

.hero-shapes span:nth-child(2) {
  width: 180px;
  height: 180px;
  background: #c7d6ff;
  top: 140px;
  right: 120px;
  animation-delay: -5s;
}

.hero-shapes span:nth-child(3) {
  width: 220px;
  height: 220px;
  background: #e7edff;
  bottom: -120px;
  left: -80px;
  animation-delay: -9s;
}

main {
  display: flex;
  flex-direction: column;
  gap: 40px;
  padding: 0 8vw 120px;
  position: relative;
  z-index: 1;
}

.panel {
  background: var(--card);
  border: 1px solid var(--stroke);
  border-radius: 28px;
  padding: 36px;
  box-shadow: var(--shadow);
  animation: fadeUp 0.9s ease forwards;
}

.panel-heading h2 {
  font-family: "Bodoni Moda", serif;
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  margin-top: 0;
}

.panel-heading p {
  margin-bottom: 0;
  color: var(--muted);
}

.panel-content {
  margin-top: 28px;
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.stat {
  padding: 18px;
  border-radius: 18px;
  border: 1px solid rgba(17, 24, 39, 0.08);
  background: #f8faff;
}

.stat-label {
  text-transform: uppercase;
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  color: var(--muted);
  display: block;
  margin-bottom: 8px;
}

.stat-value {
  font-weight: 600;
}

.topic-grid {
  list-style: none;
  padding: 0;
  margin: 24px 0 0;
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.topic-grid li {
  padding: 16px 18px;
  background: #f8faff;
  border-radius: 16px;
  border: 1px solid rgba(17, 24, 39, 0.08);
  font-weight: 500;
}

.highlight {
  background: linear-gradient(135deg, rgba(31, 91, 255, 0.08), rgba(15, 63, 158, 0.05));
  border-radius: 20px;
  padding: 24px;
}

.card {
  padding: 22px;
  border-radius: 18px;
  background: #f8faff;
  border: 1px solid rgba(17, 24, 39, 0.08);
}

.card h3 {
  margin-top: 0;
}

#call-for-papers .panel-content {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  align-items: start;
}

#call-for-papers .card {
  background: #ffffff;
  border: 1px solid rgba(31, 91, 255, 0.18);
  box-shadow: 0 14px 28px rgba(15, 23, 42, 0.08);
}

#call-for-papers .card h3 {
  position: relative;
  padding-left: 14px;
}

#call-for-papers .card h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 4px;
  height: 22px;
  border-radius: 999px;
  background: var(--accent);
}

.dates-list,
.requirements {
  margin: 12px 0 0;
  padding-left: 18px;
  color: var(--muted);
}

.dates-list li,
.requirements li {
  margin-bottom: 6px;
}

.dates-note {
  margin: 14px 0 0;
  padding: 10px 12px;
  background: rgba(31, 91, 255, 0.08);
  border-radius: 12px;
  border: 1px solid rgba(31, 91, 255, 0.2);
  color: var(--muted);
  font-size: 0.9rem;
}

.schedule {
  margin-top: 24px;
  display: grid;
  gap: 18px;
}

.schedule-row {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 16px;
  align-items: start;
  padding: 14px;
  background: #ffffff;
  border-radius: 16px;
  border: 1px solid rgba(17, 24, 39, 0.08);
}

.time {
  font-weight: 700;
  color: var(--accent-2);
}

.schedule-item h3 {
  margin: 0 0 6px;
}

.speaker-grid {
  display: grid;
  gap: 20px;
  margin-top: 24px;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.speaker-card {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 16px;
  padding: 20px;
  border-radius: 16px;
  border: 1px solid rgba(17, 24, 39, 0.08);
  background: #ffffff;
  align-items: start;
}

.speaker-photo {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid rgba(31, 91, 255, 0.12);
  box-shadow: 0 10px 20px rgba(15, 23, 42, 0.12);
}

.speaker-card h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
}

.speaker-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.speaker-card .speaker-affiliation {
  margin: 0 0 12px;
  font-size: 0.9rem;
  color: var(--muted);
  font-weight: 500;
}

.speaker-bio {
  margin: 0;
}

.speaker-bio summary {
  cursor: pointer;
  list-style: none;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
}

.speaker-bio summary::-webkit-details-marker {
  display: none;
}

.speaker-bio summary::after {
  content: "+";
  display: inline-block;
  margin-left: 8px;
}

.speaker-bio[open] summary::after {
  content: "-";
}

.speaker-bio p {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.contact {
  align-items: center;
}

.cta-group {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 24px;
  border-radius: 999px;
  background: var(--accent);
  color: white;
  font-weight: 600;
  text-decoration: none;
  box-shadow: 0 12px 20px rgba(31, 91, 255, 0.25);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 24px rgba(31, 91, 255, 0.3);
}

.footer {
  padding: 40px 8vw 70px;
  text-align: center;
  color: var(--muted);
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(20px);
  }
}

@media (max-width: 700px) {
  .speaker-card {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .speaker-photo {
    margin: 0 auto;
  }
}

@media (max-width: 900px) {
  .hero {
    padding-top: 100px;
    padding-bottom: 80px;
  }

  .nav-links {
    gap: 12px;
  }

  .schedule-row {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .hero {
    padding: 100px 6vw 70px;
  }

  main {
    padding: 0 6vw 90px;
  }

  .panel {
    padding: 26px;
  }

  .hero-meta {
    flex-direction: column;
    align-items: flex-start;
  }

  .cta-group {
    width: 100%;
  }

  .cta-group .cta {
    flex: 1 1 100%;
  }
}