* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Noto Sans JP", sans-serif;
  background: #f4f1ea;
  color: #222;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 22px 6vw;
  background: rgba(244, 241, 234, 0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid #ddd6c8;
}

.logo {
  font-weight: 800;
  letter-spacing: 0.03em;
}

nav {
  display: flex;
  gap: 24px;
  font-weight: 700;
}

.hero {
  min-height: 72vh;
  padding: 100px 6vw;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background:
    radial-gradient(circle at 80% 20%, #0b8cff 0, #0b8cff 13%, transparent 13%),
    linear-gradient(135deg, #f4f1ea 0%, #fff 100%);
}

.hero.small {
  min-height: auto;
  padding: 72px 6vw 40px;
}

.label {
  margin: 0 0 12px;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.14em;
  color: #0b8cff;
}

h1 {
  margin: 0;
  font-size: clamp(48px, 9vw, 120px);
  line-height: 0.95;
  letter-spacing: -0.06em;
}

h2 {
  margin: 0;
  font-size: 32px;
}

.hero p,
.about p {
  max-width: 640px;
  font-size: 18px;
  line-height: 1.9;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  margin-top: 32px;
  flex-wrap: wrap;
}

.main-button,
.sub-button {
  display: inline-block;
  padding: 16px 24px;
  border-radius: 999px;
  font-weight: 800;
}

.main-button {
  background: #0b8cff;
  color: white;
}

.sub-button {
  border: 2px solid #222;
}

.about {
  padding: 80px 6vw;
}

.page {
  padding-bottom: 80px;
}

.event-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
  padding: 24px 6vw 80px;
}

.event-card {
  position: relative;
  padding: 28px;
  min-height: 260px;
  border-radius: 28px;
  background: white;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.08);
  overflow: hidden;
}

.event-card::after {
  content: "→";
  position: absolute;
  right: 24px;
  bottom: 24px;
  width: 72px;
  height: 72px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: #0b8cff;
  color: white;
  font-size: 34px;
}

.event-top {
  display: flex;
  gap: 10px;
  margin-bottom: 24px;
  align-items: center;
}

.time {
  font-size: 28px;
  font-weight: 900;
}

.category {
  padding: 6px 12px;
  border-radius: 999px;
  background: #f4f1ea;
  font-size: 13px;
  font-weight: 800;
}

.venue {
  margin: 12px 0 0;
  color: #666;
  font-weight: 700;
}

.description {
  max-width: 72%;
  line-height: 1.8;
  color: #444;
}

.open-label,
.closed-label {
  display: inline-block;
  margin-top: 18px;
  padding: 8px 12px;
  border-radius: 999px;
  font-weight: 800;
  font-size: 13px;
}

.open-label {
  background: #e7f3ff;
  color: #0b64b9;
}

.closed-label {
  background: #eee;
  color: #666;
}

.event-card.closed {
  opacity: 0.62;
}

.site-footer {
  padding: 32px 6vw;
  color: #777;
  border-top: 1px solid #ddd6c8;
}

@media (max-width: 760px) {
  .site-header {
    align-items: flex-start;
    gap: 12px;
    flex-direction: column;
  }

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

  .description {
    max-width: 100%;
  }

  .event-card::after {
    width: 56px;
    height: 56px;
    font-size: 26px;
  }
}