:root {
  --bg: #f7f8fc;
  --surface: #ffffff;
  --surface-soft: #f2f5ff;
  --text: #101327;
  --muted: #4f5875;
  --primary: #2f5fff;
  --primary-soft: #dfe7ff;
  --border: #d8dff2;
  --shadow: 0 16px 40px rgba(22, 34, 79, 0.12);
  --radius-lg: 18px;
  --radius-md: 14px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #f9fafe 0%, #f5f7ff 50%, #f7f8fc 100%);
  line-height: 1.65;
}

h1,
h2,
h3 {
  font-family: "Source Serif 4", Georgia, "Times New Roman", serif;
  line-height: 1.2;
  margin: 0 0 0.65em;
  color: #091133;
}

h1 {
  font-size: clamp(2rem, 4.8vw, 3.6rem);
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
}

h3 {
  font-size: 1.2rem;
}

p {
  margin: 0 0 1rem;
}

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

.container {
  width: min(1120px, 92%);
  margin: 0 auto;
}

.narrow {
  width: min(860px, 92%);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(10px);
  background: rgba(247, 248, 252, 0.86);
  border-bottom: 1px solid rgba(216, 223, 242, 0.7);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 1rem;
}

.brand {
  font-weight: 800;
  letter-spacing: 0.02em;
  text-decoration: none;
  color: #111a47;
}

.site-nav {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.site-nav a {
  text-decoration: none;
  font-weight: 500;
  color: #2b3151;
}

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

.hero {
  padding: 6.2rem 0 4.2rem;
  position: relative;
  overflow: hidden;
}

.hero-inner {
  position: relative;
  z-index: 1;
}

.hero-glow {
  position: absolute;
  width: 680px;
  height: 680px;
  border-radius: 50%;
  right: -240px;
  top: -220px;
  background: radial-gradient(circle at center, rgba(66, 108, 255, 0.24), rgba(66, 108, 255, 0));
}

.eyebrow {
  display: inline-block;
  padding: 0.3rem 0.8rem;
  border-radius: 999px;
  background: var(--primary-soft);
  color: #1f3aa4;
  font-weight: 600;
  letter-spacing: 0.02em;
  margin-bottom: 0.9rem;
}

.subtitle {
  font-size: 1.2rem;
  font-weight: 600;
  color: #202d64;
}

.hero-meta {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
  margin: 1.2rem 0 1.5rem;
}

.hero-meta span {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 0.95rem;
  color: #273057;
}

.hero-cta {
  display: flex;
  gap: 0.85rem;
  flex-wrap: wrap;
}

.button {
  text-decoration: none;
  font-weight: 600;
  border-radius: 12px;
  padding: 0.7rem 1rem;
  border: 1px solid transparent;
}

.button.primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 10px 24px rgba(47, 95, 255, 0.26);
}

.button.ghost {
  background: var(--surface);
  color: #18234e;
  border-color: var(--border);
}

.section {
  padding: 4.1rem 0;
}

.section.alt {
  background: linear-gradient(180deg, #f1f5ff 0%, #f6f8ff 100%);
  border-top: 1px solid #e6ebff;
  border-bottom: 1px solid #e6ebff;
}

.cards {
  display: grid;
  gap: 1rem;
  margin-top: 1.4rem;
}

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

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.15rem 1.2rem;
  box-shadow: var(--shadow);
}

.card ul {
  margin: 0.5rem 0 0;
  padding-left: 1.1rem;
}

.speaker-list {
  display: grid;
  gap: 1rem;
  margin-top: 1.1rem;
}

.speaker-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1rem 1.1rem;
}

.speaker-item h3 {
  font-size: 1.08rem;
  margin-bottom: 0.45rem;
}

.speaker-item p {
  margin: 0;
  color: #2a3155;
}

.grid {
  display: grid;
  gap: 1rem;
}

.people-grid {
  margin-top: 1.2rem;
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.organizers {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.person-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  text-align: center;
  padding: 1rem 0.8rem;
}

.person-card h3 {
  margin: 0.5rem 0 0.25rem;
  font-size: 1.08rem;
}

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

.avatar {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  margin: 0 auto;
  display: grid;
  place-items: center;
  font-weight: 700;
  color: #16308b;
  background: linear-gradient(135deg, #d9e4ff, #e8edff);
  border: 1px solid #bfd0ff;
  overflow: hidden;
}

.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.timeline {
  margin-top: 1.3rem;
  display: grid;
  gap: 0.9rem;
}

.timeline-item {
  display: grid;
  grid-template-columns: 132px 1fr;
  gap: 0.9rem;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.6rem 1rem;
}

.time {
  font-weight: 700;
  color: #193187;
  white-space: nowrap;
}

.timeline-item h3 {
  margin: 0;
  font-size: 1.05rem;
}

.timeline-item p {
  margin: 0;
  color: var(--muted);
}

.notice {
  margin-top: 1.2rem;
  background: #0f1f57;
  color: #e7edff;
  border-radius: var(--radius-lg);
  padding: 1.1rem 1.2rem;
}

.notice p {
  margin: 0 0 0.45rem;
}

.notice p:last-child {
  margin-bottom: 0;
}

.notice a {
  color: #ffffff;
  font-weight: 600;
}

.muted {
  color: var(--muted);
}

.site-footer {
  border-top: 1px solid var(--border);
  background: #edf2ff;
  padding: 1rem 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer-inner p {
  margin: 0;
  color: #2e3a6e;
}

@media (max-width: 1080px) {
  .people-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (max-width: 760px) {
  .cards.two {
    grid-template-columns: 1fr;
  }

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

  .site-header {
    position: static;
  }
}

@media (max-width: 470px) {
  .people-grid,
  .organizers {
    grid-template-columns: 1fr;
  }
}