:root {
  --bg: #f4f6f9; --card: #ffffff; --ink: #1c2733; --sub: #64748b;
  --accent: #2563eb; --accent-soft: #eff6ff; --danger: #dc2626;
  --line: #e2e8f0; --radius: 14px;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: "Hiragino Sans", "Noto Sans JP", system-ui, sans-serif; font-size: 15.5px; line-height: 1.9; }
.wrap { max-width: 760px; margin: 0 auto; padding: 28px 16px 80px; }
header.site { display: flex; align-items: center; gap: 12px; margin-bottom: 24px; }
.logo { width: 44px; height: 44px; background: url('/logo.svg') no-repeat center / contain; display: block; font-size: 0; text-decoration: none; }
.site-name { font-size: 18px; font-weight: 800; color: var(--ink); text-decoration: none; }
.site-sub { font-size: 12px; color: var(--sub); }
article { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px 26px; }
h1 { font-size: 24px; line-height: 1.5; margin: 0 0 6px; }
.date { font-size: 12.5px; color: var(--sub); margin-bottom: 22px; }
h2 { font-size: 18.5px; margin: 34px 0 10px; padding-left: 12px; border-left: 4px solid var(--accent); }
h3 { font-size: 16px; margin: 22px 0 6px; }
p { margin: 10px 0; }
ul, ol { padding-left: 24px; }
li { margin: 6px 0; }
.point { background: var(--accent-soft); border: 1px solid #bfdbfe; border-radius: 10px; padding: 14px 18px; margin: 16px 0; }
.alert { background: #fef2f2; border: 1px solid #fecaca; border-radius: 10px; padding: 14px 18px; margin: 16px 0; }
.cta { display: block; text-align: center; background: var(--accent); color: #fff; font-weight: 700; text-decoration: none; padding: 14px; border-radius: 10px; margin: 28px 0 8px; }
.cta small { display: block; font-weight: 400; font-size: 12px; opacity: .85; }
table { border-collapse: collapse; width: 100%; margin: 14px 0; font-size: 14px; }
th, td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; }
th { background: #f8fafc; }
.related { margin-top: 28px; padding-top: 18px; border-top: 1px solid var(--line); }
.related h2 { border: 0; padding: 0; font-size: 15px; color: var(--sub); }
.related a { display: block; color: var(--accent); text-decoration: none; margin: 8px 0; }
footer.site { margin-top: 26px; font-size: 12px; color: var(--sub); text-align: center; }
footer.site a { color: var(--sub); }