:root{--ink:#172C22;--dim:#4C6155;--green:#146E53;--line:#C6D6CA;--paper:#F5F4EE;--white:#fff;--soft:#E8F2E9}*{box-sizing:border-box}html{scroll-padding-top:125px}body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.8 system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif}a{color:var(--green);text-underline-offset:4px}a:hover{text-decoration-thickness:2px}a:focus-visible{outline:3px solid #A45B17;outline-offset:4px}h1,h2,p{margin-top:0}h1{font-size:clamp(30px,5vw,52px);line-height:1.25;letter-spacing:-.03em;max-width:18em;margin-bottom:22px}h2{font-size:clamp(22px,3vw,28px);line-height:1.45;margin-bottom:14px}.skip{position:absolute;top:-100px;left:16px;background:#fff;padding:12px;z-index:100}.skip:focus{top:12px}.topbar{position:sticky;top:0;z-index:10;background:#0E2018;color:#fff;padding:16px max(22px,calc((100vw - 1080px)/2));display:flex;align-items:center;gap:32px;justify-content:space-between}.brand{display:block;flex:none}.brand img{display:block;max-width:128px;height:auto;filter:brightness(0) invert(1)}.topbar nav{display:flex;flex-wrap:wrap;gap:12px 22px;font-size:14px}.topbar nav a{display:inline-flex;align-items:center;min-height:44px;padding:0 4px;color:#DFEBE2;text-decoration:none}.topbar nav a[aria-current]{text-decoration:underline;font-weight:700}main{max-width:1000px;padding:62px 24px 52px;margin:auto}.eyebrow{font-size:13px;font-weight:700;letter-spacing:.1em;color:var(--green);margin-bottom:14px}.lead{font-size:20px;color:var(--dim);max-width:42em}.status{padding:24px 28px;border:1px solid #9BB7A3;border-left:5px solid var(--green);border-radius:14px;background:var(--soft);margin:30px 0 32px}.status strong{display:block;font-size:21px;margin-bottom:10px}.status p:last-child{margin-bottom:0}.contents{display:grid;grid-template-columns:1fr 1fr;gap:10px 24px;padding:20px 0 30px}.contents a{display:flex;align-items:center;min-height:44px;padding:8px 0;font-size:15px}.lessons{display:grid;gap:20px}.lesson{padding:28px 30px;border:1px solid var(--line);border-radius:16px;background:var(--white);scroll-margin-top:120px}.lesson p{color:var(--dim)}.source{display:inline-flex;align-items:center;min-height:44px;font-size:14px}.sources{margin-top:42px;padding:30px;background:#EAF0E6;border-radius:18px;border:1px solid var(--line)}.sources ul{padding:0;list-style:none}.sources li{padding:16px 0;border-bottom:1px solid var(--line)}.sources li a{display:inline-flex;align-items:center;min-height:44px}.sources li span{display:block;font-size:14px;color:var(--dim);margin-top:4px}.button{display:inline-block;margin-top:12px;padding:12px 20px;border-radius:10px;background:var(--green);color:#fff;text-decoration:none;font-weight:700}.scope{font-size:14px;margin:20px 0 0}.next{margin-top:44px}.next>a{display:inline-block;min-height:44px;padding:8px 0;margin:6px 24px 6px 0;font-size:15px}footer{max-width:1000px;margin:auto;padding:28px 24px 45px;border-top:1px solid var(--line);font-size:13px;color:var(--dim)}footer a{display:inline-flex;align-items:center;min-height:44px}footer p{margin:8px 0}@media(max-width:600px){body{font-size:16px}.topbar{position:relative;align-items:flex-start;flex-direction:column;gap:16px;padding:18px 22px}.topbar nav{gap:10px 18px}main{padding:36px 20px}.lead{font-size:18px}.status{padding:20px;margin-top:24px}.status strong{font-size:19px}.contents{grid-template-columns:1fr;padding-top:4px;gap:12px}.lesson,.sources{padding:22px}.next>a{display:block}html{scroll-padding-top:20px}}