:root{--bg:#f7f5ef;--paper:#fff;--ink:#2f3431;--muted:#68736d;--main:#6a8f7b;--dark:#3f6252;--line:#e3e7e2;--soft:#eef6f1;--accent:#f1b86a}
*{box-sizing:border-box}
body{margin:0;background:linear-gradient(180deg,#fffdf8 0%,#f3f8f5 55%,#f7f5ef 100%);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Hiragino Kaku Gothic ProN","Hiragino Sans","Yu Gothic",Meiryo,sans-serif;line-height:1.95}
a{color:var(--dark);text-decoration:none}a:hover{text-decoration:underline}
.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line)}
.header-inner{width:min(1080px,calc(100% - 32px));min-height:68px;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:18px}
.brand{font-weight:900;color:var(--dark);font-size:1.18rem}.back{padding:9px 14px;border-radius:999px;background:var(--soft);font-weight:800;font-size:.9rem}
.hero{padding:58px 0 38px;background:radial-gradient(circle at 85% 10%,rgba(241,184,106,.18),transparent 28%),radial-gradient(circle at 10% 30%,rgba(106,143,123,.14),transparent 30%);border-bottom:1px solid var(--line)}
.hero-inner,main{width:min(900px,calc(100% - 32px));margin:auto}.series{color:var(--dark);font-weight:900;letter-spacing:.08em;font-size:.9rem;margin-bottom:12px}
h1{font-size:clamp(2rem,5vw,3.45rem);line-height:1.35;margin:0;letter-spacing:.02em}.lead{font-size:1.04rem;color:var(--muted);margin:20px 0 0}.meta{margin-top:15px;color:#7a817d;font-size:.9rem}
main{margin-top:40px;margin-bottom:72px}article{background:var(--paper);border:1px solid var(--line);border-radius:24px;padding:clamp(26px,5vw,58px);box-shadow:0 14px 40px rgba(61,82,72,.07)}
#third-body p{margin:0 0 1.4em}#third-body h2{font-size:clamp(1.4rem,3vw,1.95rem);line-height:1.5;color:#465a50;margin:2.1em 0 .8em;padding-left:16px;border-left:5px solid var(--main)}
#third-body .highlight{margin:30px 0;padding:21px 24px;background:linear-gradient(135deg,#eef7f3,#fff8e9);border:1px solid #dbe9e1;border-radius:18px;font-size:1.12rem;font-weight:800;color:#35584d}
#third-body .separator{text-align:center;color:#9a9187;letter-spacing:.45em;margin:34px 0}#third-body ul{margin:0 0 1.5em;padding-left:1.4em}#third-body li+li{margin-top:.45em}
#third-body blockquote{margin:28px 0;padding:18px 22px;border-left:5px solid var(--accent);background:#fff9ef;border-radius:0 14px 14px 0;color:#5f584c}
.note{margin-top:34px;padding-top:20px;border-top:1px solid var(--line);color:var(--muted);font-size:.9rem}.preparing{padding:36px;text-align:center;background:#f5faf7;border:1px dashed #b9d0c3;border-radius:18px;color:var(--muted)}
footer{border-top:1px solid var(--line);background:#fff;text-align:center;padding:28px 16px;color:#777;font-size:.86rem}
@media(max-width:640px){.header-inner{min-height:60px}.brand{font-size:1.03rem}.back{font-size:.82rem;padding:8px 11px}.hero{padding-top:38px}main{margin-top:24px}article{padding:24px 20px;border-radius:16px}body{line-height:1.9}}