:root {
  --color-primary: #0f766e;
  --color-primary-dark: #115e59;
  --color-accent: #f59e0b;
  --color-text: #24313a;
  --color-muted: #60707a;
  --color-bg: #ffffff;
  --color-soft: #f1f7f6;
  --color-border: #dce8e6;
  --shadow: 0 12px 30px rgba(15, 77, 71, 0.09);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--color-text);
  background: var(--color-bg);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  line-height: 1.8;
}

a {
  color: inherit;
}

.container {
  width: min(100% - 40px, 960px);
  margin-inline: auto;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 88px 0 80px;
  color: #fff;
  text-align: center;
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
}

.hero::before,
.hero::after {
  position: absolute;
  width: 300px;
  height: 300px;
  border: 60px solid rgba(255, 255, 255, 0.06);
  border-radius: 50%;
  content: "";
}

.hero::before {
  top: -190px;
  left: -130px;
}

.hero::after {
  right: -180px;
  bottom: -220px;
}

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

.eyebrow,
.section-label {
  margin: 0 0 6px;
  color: var(--color-accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.18em;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2.2rem, 8vw, 4.2rem);
  line-height: 1.28;
  letter-spacing: 0.05em;
}

.hero-date {
  margin: 20px 0 28px;
  font-size: clamp(1.1rem, 4vw, 1.4rem);
  font-weight: 700;
}

.button {
  display: inline-block;
  padding: 12px 24px;
  border: 2px solid var(--color-primary);
  border-radius: 999px;
  color: #fff;
  background: var(--color-primary);
  font-weight: 700;
  line-height: 1.5;
  text-decoration: none;
  transition: transform 0.2s, background-color 0.2s;
}

.button:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
}

.button-light {
  border-color: #fff;
  color: var(--color-primary-dark);
  background: #fff;
}

.button-light:hover {
  color: #fff;
}

.congestion-guide {
  padding: 34px 0;
  color: #3d2a04;
  background: linear-gradient(135deg, #fff2bd, #ffd66b);
  box-shadow: 0 8px 24px rgba(118, 78, 0, 0.16);
}

.congestion-guide-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.congestion-label {
  margin: 0 0 4px;
  color: #8a4b00;
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.congestion-guide h2 {
  margin: 0;
  font-size: clamp(1.5rem, 4vw, 2rem);
  line-height: 1.4;
}

.congestion-guide p:last-child {
  margin: 8px 0 0;
}

.button-congestion {
  flex: 0 0 auto;
  padding: 16px 28px;
  border-color: #9a4f00;
  background: #9a4f00;
  box-shadow: 0 6px 16px rgba(99, 50, 0, 0.22);
  font-size: 1.05rem;
}

.button-congestion:hover {
  background: #713900;
}

.section {
  padding: 72px 0;
}

.section-tinted {
  background: var(--color-soft);
}

.section-heading {
  margin-bottom: 28px;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(1.6rem, 5vw, 2.1rem);
  line-height: 1.4;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.info-card {
  padding: 24px;
  border: 1px solid var(--color-border);
  border-radius: 14px;
  box-shadow: var(--shadow);
}

.info-card h3 {
  margin: 0 0 6px;
  color: var(--color-muted);
  font-size: 0.85rem;
}

.info-card p {
  margin: 0;
  font-weight: 700;
}

.lead {
  max-width: 760px;
  margin: 32px 0 0;
  font-size: 1.05rem;
}

.venue-list {
  margin: 0;
  border-top: 1px solid var(--color-border);
}

.venue-list div {
  display: grid;
  grid-template-columns: minmax(240px, 1fr) 1fr;
  gap: 24px;
  padding: 18px 4px;
  border-bottom: 1px solid var(--color-border);
}

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

.venue-list dd {
  margin: 0;
  color: var(--color-muted);
}

.notice {
  padding: 36px 40px;
  border-left: 5px solid var(--color-accent);
  border-radius: 8px;
  background: #fffaf0;
}

.notice ul {
  margin: 0;
  padding-left: 1.4em;
}

.notice li + li {
  margin-top: 10px;
}

.contact {
  text-align: center;
  background: var(--color-soft);
}

.contact-number {
  margin: 18px 0 28px;
  color: var(--color-primary-dark);
  font-size: 1.5rem;
  font-weight: 700;
}

.contact-number a {
  text-decoration: none;
}

.contact-number small {
  color: var(--color-muted);
  font-size: 0.8rem;
  font-weight: 400;
}

footer {
  padding: 24px 0;
  color: #c9d7d5;
  text-align: center;
  background: #163b38;
}

@media (max-width: 680px) {
  .hero {
    padding: 64px 0 60px;
  }

  .section {
    padding: 52px 0;
  }

  .congestion-guide-inner {
    align-items: stretch;
    flex-direction: column;
    gap: 20px;
  }

  .button-congestion {
    text-align: center;
  }

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

  .venue-list div {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .notice {
    padding: 28px 24px;
  }
}