:root {
  --night: #0b0f1a;
  --surface: #111827;
  --mid: #1e2d45;
  --line: #2a3a55;
  --mist: #3d5070;
  --foam: #7a9cc0;
  --glow: #a8c4e0;
  --moon: #dde8f4;
  --accent: #4a7fa5;
  --accent-light: #6ba3c8;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--night);
  color: var(--glow);
  font-family: "Noto Sans JP", system-ui, sans-serif;
  font-weight: 400;
  line-height: 1.9;
}

a { color: var(--accent-light); }
a:hover { color: var(--moon); }

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: 880px;
  margin: 0 auto;
  padding: 18px 20px;
  border-bottom: 0.5px solid var(--line);
}

.logo {
  font-family: "Noto Serif JP", serif;
  font-weight: 300;
  font-size: 24px;
  color: var(--moon);
  text-decoration: none;
}

.site-header nav { display: flex; align-items: center; gap: 18px; font-size: 14px; }
.site-header nav a:not(.button) { color: var(--foam); text-decoration: none; }

.button {
  display: inline-block;
  padding: 8px 18px;
  border-radius: 10px;
  background: var(--accent);
  color: #fff !important;
  text-decoration: none;
  font-size: 14px;
}
.button:hover { background: var(--accent-light); }
.button.large { padding: 14px 32px; font-size: 16px; }

main { max-width: 880px; margin: 0 auto; padding: 0 20px 64px; }

.hero { padding: 72px 0 48px; text-align: center; }
.hero h1 {
  font-family: "Noto Serif JP", serif;
  font-weight: 300;
  font-size: clamp(30px, 6vw, 44px);
  line-height: 1.5;
  color: var(--moon);
  margin: 0 0 16px;
}
.hero p { color: var(--foam); margin: 0 0 32px; }

.features { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); margin: 24px 0 48px; }
.card {
  background: var(--surface);
  border: 0.5px solid var(--line);
  border-radius: 14px;
  padding: 20px;
}
.card h3 { margin: 0 0 6px; font-weight: 500; color: var(--moon); font-size: 16px; }
.card p { margin: 0; font-size: 14px; color: var(--foam); line-height: 1.8; }

.channels { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0 0; padding: 0; list-style: none; }
.channels li { padding: 4px 14px; border-radius: 999px; border: 0.5px solid var(--line); font-size: 13px; color: var(--moon); }
.channels .c1 { background: #2d4a6e; }
.channels .c2 { background: #2a4a3e; }
.channels .c3 { background: #4a3520; }
.channels .c4 { background: #3a2a4a; }

.prose { max-width: 680px; margin: 0 auto; padding-top: 40px; }
.prose h1 { font-family: "Noto Serif JP", serif; font-weight: 300; color: var(--moon); font-size: 28px; line-height: 1.5; margin: 0 0 20px; }
.prose h2 { color: var(--moon); font-weight: 500; font-size: 19px; margin: 40px 0 8px; padding-bottom: 6px; border-bottom: 0.5px solid var(--line); }
.prose h3 { color: var(--moon); font-weight: 500; font-size: 16px; margin: 28px 0 4px; }
.prose p, .prose li { font-size: 15.5px; }
.prose .date { color: var(--mist); font-size: 13px; margin: 0; }
.prose .disclaimer { margin-top: 40px; font-size: 13px; color: var(--mist); }
.prose table { border-collapse: collapse; width: 100%; font-size: 14px; }
.prose th, .prose td { border: 0.5px solid var(--line); padding: 8px 12px; text-align: left; vertical-align: top; }
.prose th { background: var(--surface); color: var(--moon); font-weight: 500; width: 30%; }

.cta { margin: 48px 0 0; padding: 24px; text-align: center; background: var(--surface); border: 0.5px solid var(--line); border-radius: 14px; }
.cta p { margin: 0 0 14px; color: var(--moon); }

.article-list { list-style: none; margin: 16px 0; padding: 0; display: grid; gap: 12px; }
.article-list a {
  display: block;
  padding: 16px 18px;
  background: var(--surface);
  border: 0.5px solid var(--line);
  border-radius: 14px;
  text-decoration: none;
}
.article-list a:hover { border-color: var(--accent); }
.article-list strong { display: block; color: var(--moon); font-weight: 500; }
.article-list .date { display: block; color: var(--mist); font-size: 12px; }
.article-list .desc { display: block; color: var(--foam); font-size: 13.5px; line-height: 1.7; }

.pr { display: inline-block; font-size: 11px; padding: 0 6px; border: 0.5px solid var(--mist); border-radius: 4px; color: var(--foam); margin-right: 6px; }

.site-footer { max-width: 880px; margin: 0 auto; padding: 24px 20px 48px; border-top: 0.5px solid var(--line); font-size: 13px; color: var(--mist); }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-bottom: 12px; }
.site-footer a { color: var(--foam); }
.site-footer .note { margin: 0 0 8px; line-height: 1.8; }
.site-footer .copy { margin: 0; }

.logo, .site-header nav a, .button { white-space: nowrap; }

@media (max-width: 520px) {
  .site-header { padding: 14px 16px; }
  .site-header nav { gap: 12px; }
  .site-header nav a:not(.button) { display: none; }
  main { padding: 0 16px 56px; }
}