:root {
  --color-primary: #0066cc;
  --color-primary-hover: #004ea0;
  --color-ink: #101828;
  --color-slate: #475467;
  --color-line: #d9e2ec;
  --color-surface: #ffffff;
  --color-cloud: #f5f8fc;
  --color-soft: #eef4fb;
  --color-panel: #0f172a;
  --color-panel-soft: #182338;
  --radius: 8px;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 48px;
  --space-6: 64px;
  --shadow-soft: 0 18px 40px rgba(16, 24, 40, 0.08);
  --max-width: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Noto Sans JP", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--color-ink);
  background:
    radial-gradient(circle at top left, rgba(0, 102, 204, 0.1), transparent 26%),
    radial-gradient(circle at bottom right, rgba(0, 102, 204, 0.06), transparent 24%),
    linear-gradient(180deg, #f8fbff 0%, #f3f7fc 100%);
}

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

.page-shell {
  min-height: 100vh;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  width: min(calc(100% - 32px), var(--max-width));
  margin: 0 auto;
  padding: 20px 0;
  transition: all 180ms ease;
}

.site-header[data-scrolled="true"] {
  margin-top: 12px;
  padding: 12px 16px;
  border: 1px solid rgba(217, 226, 236, 0.92);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.84);
  backdrop-filter: blur(16px);
}

.brand {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.site-nav {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.site-nav a {
  color: var(--color-slate);
  font-size: 14px;
  font-weight: 700;
}

.site-nav a:hover,
.social-link:hover,
.site-link:hover,
.topic-link:hover,
.featured-link:hover {
  color: var(--color-primary);
}

main,
.site-footer {
  width: min(calc(100% - 32px), var(--max-width));
  margin: 0 auto;
}

main {
  padding-bottom: var(--space-6);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, 420px);
  gap: var(--space-4);
  align-items: stretch;
  padding: var(--space-5) 0 var(--space-4);
}

.hero-copy,
.featured-panel,
.site-card,
.topic-card,
.update-card,
.faq-item,
.editorial-card {
  border: 1px solid var(--color-line);
  border-radius: calc(var(--radius) + 4px);
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow-soft);
}

.hero-copy {
  padding: 40px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.98), rgba(239, 247, 255, 0.96));
}

.featured-panel {
  padding: 28px;
  background:
    linear-gradient(180deg, rgba(15, 23, 42, 0.98), rgba(24, 35, 56, 0.96));
  color: #eff6ff;
  border-color: #22324b;
}

.eyebrow,
.panel-label,
.update-label,
.site-category,
.site-domain {
  margin: 0 0 var(--space-2);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.eyebrow,
.update-label,
.site-category {
  color: var(--color-primary);
}

.panel-label {
  color: #8bc0ff;
}

h1,
h2,
h3 {
  margin: 0;
  letter-spacing: -0.03em;
}

h1 {
  font-size: clamp(40px, 6vw, 64px);
  line-height: 1.02;
}

h2 {
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.1;
}

h3 {
  font-size: 20px;
  line-height: 1.3;
}

p,
li,
summary,
span {
  line-height: 1.7;
}

.hero-description,
.section-note,
.site-card p,
.topic-card p,
.update-card p,
.faq-item p,
.footer-copy {
  color: var(--color-slate);
}

.hero-description {
  margin: var(--space-3) 0 0;
  font-size: 18px;
  max-width: 58ch;
}

.hero-actions {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  margin-top: var(--space-4);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 20px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 800;
  transition: transform 160ms ease, background-color 160ms ease, border-color 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

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

.button.primary:hover {
  background: var(--color-primary-hover);
}

.button.secondary {
  background: rgba(255, 255, 255, 0.92);
  border-color: var(--color-line);
}

.metric-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.metric-card {
  padding: 16px;
  border-radius: 16px;
  border: 1px solid rgba(217, 226, 236, 0.92);
  background: rgba(255, 255, 255, 0.8);
}

.metric-card strong {
  display: block;
  font-size: 28px;
  line-height: 1;
}

.metric-card span {
  display: block;
  margin-top: 6px;
  color: var(--color-slate);
  font-size: 13px;
  font-weight: 700;
}

.featured-domain {
  margin: 8px 0 0;
  color: #8bc0ff;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.06em;
}

.featured-description {
  margin: var(--space-3) 0 0;
  color: rgba(239, 246, 255, 0.86);
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: var(--space-3);
}

.tag-chip {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 10px;
  border-radius: 999px;
  background: rgba(0, 102, 204, 0.1);
  color: var(--color-primary);
  font-size: 12px;
  font-weight: 800;
}

.featured-panel .tag-chip {
  background: rgba(139, 192, 255, 0.14);
  color: #d9ecff;
}

.featured-link {
  display: inline-flex;
  align-items: center;
  margin-top: var(--space-4);
  color: #fff;
  font-weight: 800;
}

.section {
  padding-top: var(--space-5);
}

.section-heading {
  max-width: 760px;
  margin-bottom: var(--space-3);
}

.directory-grid,
.topic-grid,
.update-list {
  display: grid;
  gap: var(--space-3);
}

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

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

.site-card,
.topic-card,
.update-card {
  padding: 24px;
}

.site-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.site-domain {
  margin: 0;
  color: var(--color-slate);
  letter-spacing: 0.02em;
}

.site-note {
  margin: var(--space-2) 0 0;
  font-size: 14px;
}

.site-link {
  display: inline-flex;
  align-items: center;
  margin-top: var(--space-3);
  color: var(--color-primary);
  font-weight: 800;
}

.topic-links {
  display: grid;
  gap: 10px;
  margin-top: var(--space-3);
}

.topic-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 48px;
  padding: 0 14px;
  border-radius: 14px;
  border: 1px solid var(--color-line);
  background: var(--color-cloud);
  font-weight: 700;
}

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

.update-card {
  background: rgba(255, 255, 255, 0.92);
}

.faq-list {
  display: grid;
  gap: var(--space-2);
}

.faq-item {
  padding: 0 24px;
}

.faq-item summary {
  cursor: pointer;
  padding: 24px 0;
  font-weight: 800;
  list-style: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item p {
  margin: 0 0 24px;
}

.site-footer {
  display: grid;
  gap: var(--space-2);
  padding: var(--space-5) 0 var(--space-4);
}

.footer-title {
  margin: 0;
  font-size: 16px;
  font-weight: 800;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.social-link {
  color: var(--color-primary);
  font-weight: 700;
}

@media (max-width: 980px) {
  .hero,
  .directory-grid,
  .topic-grid,
  .update-list {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .site-header,
  .site-header[data-scrolled="true"],
  main,
  .site-footer {
    width: calc(100% - 24px);
  }

  .site-header[data-scrolled="true"] {
    border-radius: 24px;
  }

  .site-nav {
    display: none;
  }

  .hero {
    padding-top: var(--space-4);
  }

  .hero-copy,
  .featured-panel,
  .site-card,
  .topic-card,
  .update-card {
    padding: 20px;
  }

  .metric-row {
    grid-template-columns: 1fr;
  }

  .site-card-head {
    flex-direction: column;
    align-items: flex-start;
  }
}