:root{color-scheme:light;--ink:#172b2a;--muted:#627572;--teal:#0f766e;--line:#dce9e6;--bg:#f7f9f8}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.85 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;-webkit-font-smoothing:antialiased}
header,main,footer{width:min(100% - 40px,780px);margin-inline:auto}header{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:30px 0;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;font-size:20px;font-weight:650;white-space:nowrap}nav{display:flex;flex-wrap:wrap;gap:4px}nav a{font-size:14px;padding:7px 10px;border-radius:8px;text-decoration:none}nav a[aria-current]{background:#e0f1ec;color:var(--teal);font-weight:650}main{padding-block:46px 28px}h1{font-size:clamp(30px,6vw,42px);letter-spacing:-.04em;line-height:1.25;margin:0 0 12px}h2{font-size:21px;line-height:1.45;margin:34px 0 10px;letter-spacing:-.015em}p{margin:0 0 16px;overflow-wrap:anywhere}.date{font-size:14px;color:var(--muted)}.intro{font-size:19px;line-height:1.7;margin:28px 0;padding-bottom:28px;border-bottom:1px solid var(--line)}a{color:var(--teal);text-underline-offset:4px}a:hover{text-decoration:underline}a:focus-visible{outline:3px solid var(--teal);outline-offset:4px}footer{padding:22px 0 36px;border-top:1px solid var(--line);font-size:14px;color:var(--muted)}@media(max-width:560px){header{align-items:flex-start;flex-direction:column;gap:16px;padding-block:22px}main{padding-top:32px}nav a{padding:9px 12px}body{font-size:16px}}@media print{body{background:white;color:black;font-size:11pt}header nav{display:none}header,main,footer{width:100%}a{color:inherit}section{break-inside:avoid}}

h3{font-size:20px;line-height:1.5;margin:28px 0 10px}.part{font-size:28px;padding-top:28px;border-top:1px solid var(--line);scroll-margin-top:24px}.contents{gap:10px;margin:20px 0 30px}.contents a{border:1px solid var(--line);background:#e0f1ec;padding:10px 18px;font-size:16px}