:root {
  --bg: #f6f3ee;
  --ink: #1c1a17;
  --muted: #5c574f;
  --accent: #0f6b5c;
  --card: #fffdf9;
  --line: #ddd4c6;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "IBM Plex Sans JP", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 10% -10%, #d9efe9 0%, transparent 55%),
    radial-gradient(900px 400px at 100% 0%, #f0e2d0 0%, transparent 50%),
    var(--bg);
  line-height: 1.7;
}
a { color: var(--accent); }
.wrap { width: min(920px, 92vw); margin: 0 auto; padding: 1.5rem 0 3rem; }
header.site {
  display: flex; justify-content: space-between; align-items: baseline;
  border-bottom: 1px solid var(--line); padding: 1.25rem 0; margin-bottom: 1.5rem;
}
.brand { font-weight: 700; font-size: 1.35rem; text-decoration: none; color: var(--ink); }
.tagline { color: var(--muted); font-size: 0.95rem; }
nav a { margin-left: 1rem; text-decoration: none; color: var(--muted); }
.hero h1 { font-size: clamp(1.6rem, 3vw, 2.2rem); margin: 0 0 0.5rem; }
.list { list-style: none; padding: 0; }
.list li {
  background: var(--card); border: 1px solid var(--line);
  border-radius: 12px; padding: 1rem 1.1rem; margin: 0.75rem 0;
}
.meta { color: var(--muted); font-size: 0.85rem; }
article.post { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 1.4rem; }
.pr-banner {
  background: #eef7f4; border: 1px solid #b9d9d0; border-radius: 10px;
  padding: 0.75rem 1rem; margin: 0 0 1.25rem; font-size: 0.92rem;
}
footer { margin-top: 2.5rem; color: var(--muted); font-size: 0.85rem; border-top: 1px solid var(--line); padding-top: 1rem; }