:root {
  --page-bg: #f4f7fb;
  --surface: #ffffff;
  --text: #172033;
  --muted: #64748b;
  --line: #dbe3ee;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --shadow: 0 14px 38px rgba(30, 55, 90, 0.09);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--page-bg);
  color: var(--text);
  font-family:
    -apple-system,
    BlinkMacSystemFont,
    "Hiragino Sans",
    "Yu Gothic",
    "Meiryo",
    sans-serif;
  line-height: 1.7;
}

a {
  color: inherit;
}

.site-header {
  background:
    radial-gradient(
      circle at 85% 15%,
      rgba(255, 255, 255, 0.23),
      transparent 28%
    ),
    linear-gradient(135deg, #164e63 0%, #2563eb 100%);
  color: #ffffff;
  padding: 30px 24px 28px;
}

.header-inner {
  width: min(1180px, 100%);
  margin: 0 auto;
}

.eyebrow {
  margin: 0 0 8px;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.2em;
  opacity: 0.82;
}

.site-header h1 {
  margin: 0;
  font-size: clamp(1.9rem, 4vw, 2.55rem);
  line-height: 1.2;
  letter-spacing: 0.02em;
}

.header-description {
  max-width: 760px;
  margin: 7px 0 0;
  font-size: 0.98rem;
  line-height: 1.6;
  opacity: 0.94;
}

.summary-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 17px;
}

.summary-item {
  display: flex;
  align-items: baseline;
  gap: 8px;
  min-width: 142px;
  padding: 7px 14px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(6px);
}

.summary-value {
  font-size: 1.15rem;
  font-weight: 800;
}

.summary-label {
  font-size: 0.85rem;
  opacity: 0.9;
}

.main-content {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 34px 0 60px;
}

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

.intro-section h2 {
  margin: 0 0 6px;
  font-size: 1.65rem;
}

.intro-section p {
  margin: 0;
  color: var(--muted);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.database-card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 300px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--surface);
  box-shadow: var(--shadow);
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease;
}

.database-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 46px rgba(30, 55, 90, 0.14);
}

.database-card::before {
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  height: 6px;
  content: "";
  background: var(--card-accent, #2563eb);
}

.card-icon {
  display: grid;
  place-items: center;
  width: 68px;
  height: 46px;
  margin: 23px 24px 0;
  border-radius: 14px;
  background: var(--card-soft, #dbeafe);
  color: var(--card-accent, #2563eb);
  font-size: 1rem;
  font-weight: 900;
}

.card-content {
  display: flex;
  flex: 1;
  flex-direction: column;
  padding: 14px 24px 22px;
}

.card-category {
  margin: 0 0 3px;
  color: var(--card-accent, #2563eb);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.card-content h2 {
  margin: 0;
  font-size: 1.35rem;
  line-height: 1.4;
}

.card-description {
  flex: 1;
  margin: 11px 0 17px;
  color: var(--muted);
  font-size: 0.94rem;
}

.card-links {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.primary-link,
.secondary-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 44px;
  border-radius: 11px;
  padding: 9px 14px;
  text-decoration: none;
  font-weight: 700;
}

.primary-link {
  background: var(--card-accent, #2563eb);
  color: #ffffff;
}

.primary-link:hover {
  filter: brightness(0.95);
}

.secondary-link {
  border: 1px solid var(--line);
  background: #f8fafc;
  color: #334155;
}

.secondary-link:hover {
  border-color: var(--card-accent, #2563eb);
  color: var(--card-accent, #2563eb);
}

.period-card {
  --card-accent: #2563eb;
  --card-soft: #dbeafe;
}

.rainfall-card {
  --card-accent: #0369a1;
  --card-soft: #e0f2fe;
}

.rain-days-card {
  --card-accent: #0f766e;
  --card-soft: #ccfbf1;
}

.sunshine-card {
  --card-accent: #d97706;
  --card-soft: #fef3c7;
}

.sunny-days-card {
  --card-accent: #ea580c;
  --card-soft: #ffedd5;
}

.station-card {
  --card-accent: #7c3aed;
  --card-soft: #ede9fe;
}

.guide-section {
  margin-top: 34px;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.guide-label {
  margin: 0;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.guide-section > div > h2 {
  margin: 3px 0 22px;
  font-size: 1.45rem;
}

.guide-columns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.guide-item {
  padding: 18px;
  border-radius: 15px;
  background: #f8fafc;
}

.guide-item h3 {
  margin: 0 0 7px;
  font-size: 1rem;
}

.guide-item p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.site-footer {
  padding: 25px 20px 38px;
  color: var(--muted);
  text-align: center;
  font-size: 0.86rem;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 980px) {
  .card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 700px) {
  .site-header {
    padding: 48px 20px 44px;
  }

  .main-content {
    width: min(100% - 28px, 1180px);
    padding-top: 36px;
  }

  .card-grid,
  .guide-columns {
    grid-template-columns: 1fr;
  }

  .database-card {
    min-height: auto;
  }

  .summary-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
  }

  .summary-item {
    display: block;
    min-width: 0;
    padding: 10px;
    text-align: center;
  }

  .summary-value,
  .summary-label {
    display: block;
  }

  .card-icon {
    margin-top: 25px;
  }

  .guide-section {
    padding: 24px 20px;
  }
}


.update-section {
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr);
  gap: 28px;
  margin-top: 22px;
  padding: 27px 30px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.update-heading h2 {
  margin: 3px 0 0;
  font-size: 1.35rem;
}

.update-list {
  margin: 0;
}

.update-item {
  display: grid;
  grid-template-columns: 115px minmax(0, 1fr);
  gap: 17px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}

.update-item:first-child {
  padding-top: 0;
}

.update-item:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.update-item dt {
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 700;
}

.update-item dd {
  margin: 0;
  color: #334155;
  font-size: 0.91rem;
}

@media (max-width: 700px) {
  .update-section {
    grid-template-columns: 1fr;
    gap: 17px;
    padding: 23px 20px;
  }

  .update-item {
    grid-template-columns: 1fr;
    gap: 2px;
  }
}