:root{--ink:#183b3b;--muted:#587370;--teal:#0d7377;--line:#dce8e5;--bg:#f3f8f6}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:22px}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.85 -apple-system,BlinkMacSystemFont,'Segoe UI','Malgun Gothic',sans-serif}a{color:var(--teal);text-underline-offset:4px}a:hover{color:#08494c}a:focus-visible{outline:3px solid #dcad27;outline-offset:4px}main{max-width:1040px;margin:auto;padding:28px 24px 50px}.topnav{display:flex;flex-wrap:wrap;gap:8px 22px;margin-bottom:24px;font-size:14px}.topnav a{font-weight:650}.hero{padding:26px 0 30px}.eyebrow{font-size:13px;letter-spacing:.05em;font-weight:700;color:var(--teal)}h1{font-size:clamp(29px,4vw,42px);line-height:1.35;margin:12px 0 16px;letter-spacing:-.04em}h2{font-size:25px;line-height:1.45;margin:0 0 15px;letter-spacing:-.025em}h3{font-size:18px;margin:24px 0 10px}.hero p{max-width:720px;margin:0 0 16px;color:var(--muted)}.meta{font-size:13px;color:var(--muted)}.layout{display:grid;grid-template-columns:220px minmax(0,1fr);gap:26px}.toc{align-self:start;position:sticky;top:20px;border-top:2px solid var(--teal);padding-top:15px}.toc ol{padding-left:20px}.toc a{font-size:14px;text-decoration:none}.toc li{margin:8px 0}.topic{background:#fff;border:1px solid var(--line);border-radius:18px;padding:30px;margin-bottom:24px;scroll-margin-top:20px}.topic p{margin:0 0 16px}.lead{font-size:17px;font-weight:600;color:#345a56}.example{border-left:3px solid #78aeaa;padding:15px 18px;background:#f1f8f7;font-size:17px;line-height:1.8;overflow-wrap:anywhere}.practice{border-top:1px solid var(--line);padding-top:17px;color:#365d58}.source{font-size:12px;color:var(--muted)}.table-scroll{overflow-x:auto;margin:20px 0}table{border-collapse:collapse;width:100%;font-size:14px}th,td{border:1px solid var(--line);padding:12px;text-align:left;vertical-align:top}th{background:#edf5f3;white-space:nowrap}td{min-width:90px}.phrase-list{padding-left:20px}.phrase-list li{margin:16px 0}.phrase-list span{font-size:18px;font-weight:650}.phrase-list small{display:block;color:var(--muted);font-size:14px;margin-top:5px}.groups{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.group{padding:26px;background:#fff;border:1px solid var(--line);border-radius:18px}.group h2{font-size:23px}.group p{color:var(--muted);font-size:14px}.group ol{padding-left:20px;font-size:14px}.group li{margin:10px 0}.group>a{font-weight:700}.reading-note{margin:26px 0;color:var(--muted);font-size:14px}.site-nav{border-top:1px solid var(--line);padding-top:22px;margin-top:32px;display:flex;flex-wrap:wrap;gap:8px 20px;font-size:14px}.practice-link{display:inline-block;background:var(--teal);color:#fff;padding:9px 18px;border-radius:9px;text-decoration:none;margin-top:10px}.practice-link:hover{color:#fff;background:#08494c}.learning-strip{max-width:820px;margin:18px auto;padding:18px 20px;border-top:1px solid var(--line,#dce8e5);font-size:14px}.learning-strip strong{display:block;margin-bottom:9px}.learning-strip nav{display:flex;flex-wrap:wrap;gap:10px 18px}@media(max-width:760px){main{padding:18px 16px 36px}.layout{grid-template-columns:1fr;gap:18px}.toc{position:static;padding:16px;background:#eaf4f1;border-radius:12px;border-top:0}.toc ol{display:grid;grid-template-columns:1fr 1fr;gap:4px 20px;margin-bottom:0}.toc li{margin:5px 0}.topic{padding:23px 20px}h2{font-size:23px}.groups{grid-template-columns:1fr}.hero{padding:20px 0}.table-scroll{margin-left:-4px;margin-right:-4px}td{min-width:100px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
.layout>*{min-width:0}.toc a{overflow-wrap:anywhere}@media(max-width:760px){.layout{grid-template-columns:minmax(0,1fr)}.toc ol{grid-template-columns:repeat(2,minmax(0,1fr))}}