:root {
  color-scheme: light;
  --bg: #f7f5f0;
  --paper: #fffdf8;
  --ink: #20242a;
  --muted: #5d6673;
  --line: #ded8cc;
  --accent: #0f766e;
  --accent-soft: #e6f4f1;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.75;
}

.site-header {
  position: sticky;
  top: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 0.9rem clamp(1rem, 4vw, 3rem);
  background: rgba(255, 253, 248, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}

.brand {
  color: var(--ink);
  font-weight: 800;
  text-decoration: none;
  letter-spacing: 0.02em;
}

nav { display: flex; gap: 1rem; flex-wrap: wrap; }
nav a { color: var(--muted); text-decoration: none; font-size: 0.95rem; }
nav a:hover { color: var(--accent); }

main {
  width: min(1080px, calc(100% - 2rem));
  margin: 0 auto;
}

.hero { padding: 4.5rem 0 2rem; }
.eyebrow { color: var(--accent); font-weight: 700; margin: 0 0 0.5rem; }
h1 { font-size: clamp(2.1rem, 6vw, 4.4rem); line-height: 1.12; margin: 0; }
.lead { color: var(--muted); font-size: 1.12rem; max-width: 760px; }
.notice {
  margin-top: 1.5rem;
  padding: 1rem 1.1rem;
  background: var(--accent-soft);
  border: 1px solid #bfe3dd;
  border-radius: 8px;
}

.section { padding: 2rem 0; }
h2 { font-size: 1.65rem; margin: 0 0 1rem; }
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1rem;
}
.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1.1rem;
}
.card h3 { margin-top: 0; }
.card p, .status-list { color: var(--muted); }
.steps { background: var(--paper); border: 1px solid var(--line); border-radius: 8px; padding: 1.2rem 1.2rem 1.2rem 2.4rem; }
.status-list { background: var(--paper); border: 1px solid var(--line); border-radius: 8px; padding: 1.2rem 1.2rem 1.2rem 2.4rem; }
.section-lead { color: var(--muted); max-width: 760px; }
.article-link { color: var(--ink); text-decoration: none; }
.article-link:hover { color: var(--accent); text-decoration: underline; }

/* 記事ページ */
.article {
  max-width: 760px;
  margin: 0 auto;
  padding: 3rem 0 1rem;
}
.article h1 { font-size: clamp(1.7rem, 4.5vw, 2.6rem); line-height: 1.3; }
.article h2 { margin-top: 2.2rem; }
.article h3 { margin: 1.4rem 0 0.4rem; }
.article p, .article li { color: var(--ink); }
.article ul { padding-left: 1.4rem; }
.article li { margin-bottom: 0.4rem; }
.article-note {
  margin-top: 1.2rem;
  padding: 0.9rem 1.1rem;
  background: var(--accent-soft);
  border: 1px solid #bfe3dd;
  border-radius: 8px;
  color: var(--muted);
}
.check-list, .source-list {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1.1rem 1.1rem 1.1rem 2.2rem;
}
.source-list { word-break: break-all; }
.source-list a { color: var(--accent); }
.article-back { margin-top: 2.5rem; }
.article-back a { color: var(--accent); }

.site-footer {
  margin-top: 3rem;
  padding: 2rem clamp(1rem, 4vw, 3rem);
  border-top: 1px solid var(--line);
  color: var(--muted);
}
.site-footer a { color: var(--accent); }

@media (max-width: 640px) {
  .site-header { align-items: flex-start; flex-direction: column; }
  .hero { padding-top: 2.5rem; }
}

.source-note { font-size: 0.78rem; color: var(--muted); line-height: 1.7; }
.pr-note { font-size: 0.78rem; color: var(--muted); line-height: 1.7; }
.source-note a { color: var(--muted); text-decoration: underline; }