:root{--bg:#f7f5f2;--ink:#24231f;--muted:#65645d;--line:#d5d0c6;--accent:#b43f2b;--sans:'Noto Sans JP',sans-serif;--brand:Arial,'Noto Sans JP','Hiragino Sans','Yu Gothic',sans-serif;--serif:'Libre Baskerville',Georgia,serif;--mono:'IBM Plex Mono',monospace}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.85;-webkit-font-smoothing:antialiased}
html[lang=ko]{--sans:'Noto Sans KR',sans-serif;--brand:Arial,'Noto Sans KR',sans-serif}
html[lang=zh-Hant]{--sans:'Noto Sans TC',sans-serif;--brand:Arial,'Noto Sans TC',sans-serif}
a{color:inherit;text-underline-offset:.22em}
a:focus-visible{outline:3px solid var(--accent);outline-offset:5px}
header,main,footer{max-width:1160px;margin:auto}
header{height:80px;display:flex;gap:28px;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}
.brand{font-family:var(--brand);font-size:28px;font-weight:800;line-height:1;text-decoration:none;display:flex;align-items:center;gap:9px;letter-spacing:-.065em;white-space:nowrap}
.brand::before{content:'🍌';font-size:22px;line-height:1;letter-spacing:0}
.brand-logo{display:none;width:30px;height:30px;object-fit:contain;background:transparent}
.brand sup{align-self:flex-start;margin-top:1px;border:1px solid var(--line);border-radius:999px;padding:3px 6px;font-size:10px;font-weight:600;line-height:1;letter-spacing:0;color:var(--muted)}
.section-name{font-family:var(--brand);font-size:12px;font-weight:600;line-height:1.4;letter-spacing:0;margin-left:8px;border-left:1px solid var(--line);padding-left:16px;color:var(--muted)}
.header-actions{display:flex;align-items:center;gap:24px}
.product-link{font-family:var(--sans);font-size:12px;font-weight:700;text-decoration:none;white-space:nowrap}
.product-link:hover{text-decoration:underline;color:var(--accent)}
nav{display:flex;gap:18px;font-size:12px}
nav a{text-decoration:none;white-space:nowrap}
nav a[aria-current]{text-decoration:underline;color:var(--accent)}
.intro{padding:66px 0 48px;max-width:900px}
.eyebrow{font:500 12px var(--mono);letter-spacing:.08em;color:var(--accent);text-transform:uppercase}
.eyebrow span{margin-left:20px;color:var(--muted)}
h1{font-size:clamp(30px,4.2vw,54px);font-weight:700;line-height:1.45;letter-spacing:-.035em;margin:24px 0;white-space:pre-line;text-wrap:balance}
.lead{font-size:18px;max-width:720px}
.scope,.note{font-size:13px;color:var(--muted);max-width:800px}
.text-link{display:inline-block;font-size:14px;margin-top:12px;font-weight:700}
.case{border-top:1px solid var(--line);padding:40px 0 48px}
.case-head{display:flex;gap:25px;align-items:baseline}
.number{font:400 45px var(--serif);color:var(--accent)}
h2{font-size:clamp(23px,2.6vw,32px);line-height:1.5;letter-spacing:-.025em;margin:10px 0 20px}
.case-intro{max-width:860px;color:var(--muted);font-size:14px}
.pair{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin:28px 0}
figure{margin:0;min-width:0}
figure a{display:block}
img{width:100%;height:auto;display:block;background:#e7e2d8}
figcaption{font-size:13px;color:var(--muted);padding:12px 0;line-height:1.7}
dl{margin:18px 0 0;max-width:960px}
dl>div{display:grid;grid-template-columns:145px 1fr;gap:18px;padding:14px 0;border-bottom:1px solid var(--line)}
dt{font-size:13px;font-weight:700}
dd{font-size:14px;margin:0}
.method,.record,.next{padding:38px 0;border-top:1px solid var(--line)}
.method ol{max-width:920px;padding-left:1.5em}
.method li{margin-bottom:12px;padding-left:8px;font-size:15px}
.record>p,.next>p{max-width:850px;font-size:14px}
.metrics{display:grid;grid-template-columns:repeat(3,1fr);max-width:760px;margin:30px 0;border-block:1px solid var(--line);padding:24px 0}
.metrics>div{display:flex;flex-direction:column;gap:12px;padding:0 20px;border-right:1px solid var(--line)}
.metrics>div:first-child{padding-left:0}
.metrics>div:last-child{border:0}
.metrics strong{font:400 46px var(--serif)}
.metrics span{font-size:12px}
.next{margin-bottom:38px}
footer{border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:20px;padding:28px 0 45px;color:var(--muted);font-size:12px}
.skip{position:absolute;left:16px;top:-80px;padding:8px;background:white}
.skip:focus{top:8px}
@media(max-width:1220px){header,main,footer{margin-inline:28px}}
@media(max-width:660px){header{height:auto;align-items:flex-start;flex-direction:column;gap:18px;padding:22px 0}.brand{font-size:24px}.brand::before{font-size:20px}.section-name{font-size:10px;padding-left:12px;margin-left:3px}.header-actions{width:100%;justify-content:space-between;gap:14px}header,main,footer{margin-inline:20px}.intro{padding:40px 0 32px}.lead{font-size:16px}nav{gap:22px}.pair{gap:12px}.case-head{gap:15px}.number{font-size:32px}dl>div{grid-template-columns:1fr;gap:4px}figcaption{font-size:11px}.metrics>div{padding-inline:12px}.metrics strong{font-size:34px}.metrics span{font-size:11px}footer{flex-direction:column;gap:8px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}