:root{--bg:#fff;--bg-soft:#f7f6f2;--ink:#23211e;--muted:#6b6960;--line:#ece9e1;--teal:#0f6e56;--teal-2:#1d9e75;--teal-bg:#e8f5ef;--amber:#b9791b;--amber-bg:#fbf1df;--maxw:1080px;--readw:740px;--radius:14px;--shadow:0 1px 2px rgba(0,0,0,.04),0 8px 24px rgba(0,0,0,.06)}*{box-sizing:border-box}body,html{margin:0;padding:0}body{font-family:Helvetica Neue,Arial,Hiragino Kaku Gothic ProN,Yu Gothic,Noto Sans JP,sans-serif;color:var(--ink);background:var(--bg-soft);line-height:1.85;font-size:16px;-webkit-font-smoothing:antialiased}a{color:var(--teal);text-decoration:none}a:hover{text-decoration:underline}.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}.site-head{position:-webkit-sticky;position:sticky;top:0;z-index:50;background:hsla(0,0%,100%,.92);-webkit-backdrop-filter:saturate(1.2) blur(8px);backdrop-filter:saturate(1.2) blur(8px);border-bottom:1px solid var(--line)}.site-head .wrap{display:flex;align-items:center;justify-content:space-between;height:62px}.brand{font-weight:700;font-size:19px;color:var(--ink);letter-spacing:.02em}.brand small{display:block;font-size:10px;font-weight:500;color:var(--teal);letter-spacing:.18em;margin-top:-2px}.nav a{margin-left:20px;font-size:14px;color:var(--muted);font-weight:500}.nav a:hover{color:var(--teal);text-decoration:none}@media(max-width:640px){.nav a{margin-left:12px;font-size:12px}.brand{font-size:16px}}.hero{background:linear-gradient(180deg,var(--teal-bg),transparent);border-bottom:1px solid var(--line)}.hero .wrap{padding:46px 20px 34px}.hero .eyebrow{display:inline-block;font-size:12px;font-weight:700;color:var(--teal);background:#fff;border:1px solid var(--teal);border-radius:999px;padding:4px 14px;letter-spacing:.04em}.hero h1{font-size:30px;font-weight:700;margin:14px 0 10px;line-height:1.4;letter-spacing:.01em}.hero p{color:var(--muted);margin:0;max-width:680px;font-size:15px}@media(max-width:640px){.hero 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12px;padding-left:12px;border-left:4px solid var(--teal-2)}.article h3{font-size:16px;font-weight:700;margin:22px 0 8px}.article li,.article p{font-size:15.5px}.article img{max-width:100%;height:auto;border:1px solid var(--line);border-radius:12px}.article em{color:var(--muted);font-style:normal;font-size:13px;display:block;margin-top:6px}.article table{width:100%;border-collapse:collapse;margin:18px 0;font-size:14px;overflow:hidden;border-radius:10px;border:1px solid var(--line)}.article td,.article th{border-bottom:1px solid var(--line);padding:9px 12px;text-align:left;vertical-align:top}.article th{background:var(--bg-soft);font-weight:700}.article tr:last-child td{border-bottom:0}.article blockquote{border-left:3px solid var(--teal-2);background:var(--teal-bg);margin:16px 0;padding:12px 16px;color:#2c3b36;border-radius:0 8px 8px 0}.hero-img{display:block;margin:18px 0 6px}.hero-img img{width:100%;max-width:440px;height:auto;border:1px solid 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14px;font-size:14px;font-weight:600}.related a:hover{border-color:var(--teal);text-decoration:none}.site-foot{border-top:1px solid var(--line);margin-top:30px;padding:26px 0;color:var(--muted);font-size:13px;background:#fff}.site-foot p{margin:4px 0}