:root {
  --bg: #eef2f7;
  --paper: rgba(250, 252, 255, 0.84);
  --paper-strong: #ffffff;
  --ink: #18212d;
  --muted: #5d6776;
  --line: rgba(24, 33, 45, 0.12);
  --accent: #285ea8;
  --accent-deep: #173b72;
  --accent-soft: #d9e7fb;
  --gold: #c58e2d;
  --shadow: 0 28px 64px rgba(33, 53, 85, 0.12);
  --radius: 24px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Space Grotesk", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(197, 142, 45, 0.14), transparent 24%),
    radial-gradient(circle at top right, rgba(40, 94, 168, 0.16), transparent 22%),
    linear-gradient(180deg, #f7faff 0%, #e7edf6 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(24, 33, 38, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(24, 33, 38, 0.03) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.5), transparent 85%);
}

.page-shell {
  width: min(1160px, calc(100% - 32px));
  margin: 0 auto;
  padding: 24px 0 48px;
}

.site-header {
  position: sticky;
  top: 16px;
  z-index: 20;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  margin-bottom: 24px;
  padding: 14px 18px;
  background: rgba(249, 252, 255, 0.8);
  backdrop-filter: blur(18px);
  border: 1px solid rgba(255, 255, 255, 0.55);
  border-radius: 999px;
  box-shadow: 0 16px 32px rgba(24, 33, 38, 0.08);
}

.brand,
.site-nav a,
.button,
.organizer-grid a {
  text-decoration: none;
}

.brand {
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent-deep);
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.site-nav a {
  color: var(--muted);
  font-size: 0.95rem;
}

.hero,
.card,
.site-footer {
  position: relative;
  overflow: hidden;
  background: var(--paper);
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 64px 48px 40px;
  margin-bottom: 24px;
  text-align: center;
  isolation: isolate;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, rgba(245, 248, 255, 0.9), rgba(244, 247, 253, 0.94)),
    url("assets/hero-network-bg.jpeg") center/cover no-repeat;
  background-position: center center;
  opacity: 0.96;
  z-index: -1;
}

.hero::after,
.card::after {
  content: "";
  position: absolute;
  inset: auto -10% -40% auto;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(40, 94, 168, 0.16), transparent 68%);
}

.eyebrow,
.section-tag,
.hero-code {
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.eyebrow,
.section-tag {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 700;
}

.hero h1,
.card h2,
.card h3 {
  font-family: "Source Serif 4", serif;
  margin: 0;
}

.hero h1 {
  max-width: none;
  margin: 0 auto;
  font-size: clamp(1.15rem, 1.85vw, 1.75rem);
  line-height: 1.16;
  text-align: center;
}

.hero h1 span {
  display: block;
  white-space: nowrap;
}

.hero-code {
  margin: 16px 0 0;
  color: var(--gold);
  font-weight: 700;
  text-align: center;
}

.hero-text {
  max-width: 760px;
  margin: 24px auto 0;
  font-size: 1.12rem;
  line-height: 1.75;
  color: var(--muted);
  text-align: center;
}

.hero-actions,
.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
  justify-content: center;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 999px;
  font-weight: 700;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-deep));
  box-shadow: 0 16px 28px rgba(40, 94, 168, 0.24);
}

.button-secondary {
  color: var(--accent-deep);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
}

.hero-meta {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
}

.hero-meta li {
  padding: 18px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(24, 33, 38, 0.08);
  border-radius: 20px;
}

.hero-meta span {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 0.82rem;
}

.hero-meta strong {
  font-size: 1rem;
}

.grid-layout {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 24px;
  margin-bottom: 24px;
}

.card {
  padding: 32px;
  margin-bottom: 24px;
}

.card-wide {
  min-height: 100%;
}

.card p,
.card li,
.site-footer p {
  color: var(--muted);
  line-height: 1.75;
}

.card h2 {
  margin-bottom: 18px;
  font-size: clamp(1.9rem, 3vw, 2.7rem);
  line-height: 1.05;
}

.card h3 {
  margin-bottom: 8px;
  font-size: 1.2rem;
}

.highlight-card {
  background:
    linear-gradient(180deg, rgba(40, 94, 168, 0.96), rgba(23, 59, 114, 0.98)),
    var(--paper);
}

.highlight-card .section-tag,
.highlight-card h2,
.highlight-card li {
  color: #f7f6f1;
}

.check-list,
.topic-columns ul {
  margin: 0;
  padding-left: 20px;
}

.info-grid,
.organizer-grid,
.topic-columns {
  display: grid;
  gap: 18px;
}

.info-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 24px;
}

.info-grid > div,
.organizer-grid article {
  padding: 20px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
  border-radius: 20px;
}

.inline-link {
  display: inline-block;
  max-width: 100%;
  overflow-wrap: anywhere;
  word-break: break-word;
  line-height: 1.7;
}

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

.date-list {
  display: grid;
  gap: 14px;
  margin: 0;
}

.date-list div {
  padding: 18px 20px;
  background: var(--paper-strong);
  border: 1px solid var(--line);
  border-radius: 18px;
}

.date-list dt {
  font-weight: 700;
}

.date-list dd {
  margin: 8px 0 0;
  color: var(--muted);
}

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

.organizer-grid a {
  color: var(--accent);
  font-weight: 700;
}

.support-block {
  margin-top: 28px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.support-logo-card {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 10px;
  padding: 28px 24px;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid rgba(24, 33, 45, 0.08);
  border-radius: 22px;
}

.support-logo {
  display: block;
  width: min(100%, 520px);
  height: auto;
}

.contact-card {
  text-align: center;
}

.site-footer {
  padding: 18px 24px;
  text-align: center;
}

@media (max-width: 920px) {
  .site-header,
  .grid-layout,
  .hero-meta,
  .info-grid,
  .organizer-grid,
  .topic-columns {
    grid-template-columns: 1fr;
  }

  .site-header {
    position: static;
    flex-direction: column;
    align-items: flex-start;
    border-radius: 24px;
  }

  .hero {
    padding: 40px 24px 28px;
  }

  .card {
    padding: 24px;
  }
}

@media (max-width: 640px) {
  .page-shell {
    width: min(100% - 20px, 1160px);
    padding-top: 12px;
  }

  .hero h1 {
    max-width: 16ch;
  }

  .hero h1 span {
    white-space: normal;
  }

  .site-nav {
    gap: 12px;
  }

  .site-nav a,
  .hero-text,
  .card p,
  .card li {
    font-size: 0.98rem;
  }
}