*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#f7f5ef;color:#213b34;font:16px/1.75 system-ui,sans-serif}main{max-width:1120px;padding:0 44px;margin:auto}nav{display:flex;justify-content:space-between;align-items:center;padding:28px 0;border-bottom:1px solid #d8ded4}nav span,small{font-size:13px;letter-spacing:.12em;color:#60766b}.hero{padding:90px 0 85px;max-width:850px}h1{font-size:clamp(42px,6vw,76px);line-height:1.28;letter-spacing:-.04em;margin:25px 0}h1 em{font-style:normal;color:#64806b}.hero p{max-width:570px;font-size:19px;color:#536a60}.hero a{display:inline-flex;gap:40px;padding:12px 22px;margin-top:22px;background:#244d3d;color:#fff;text-decoration:none;border-radius:5px}.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;padding:30px 0 65px}.cards article{border-top:2px solid #becfbc;padding:22px 0}.cards span{font-size:12px;color:#678471}h2{font-size:24px}p{color:#526b60}#start{background:#e9eee3;border-radius:12px;padding:36px 44px}li{padding:5px 0}.muted{font-size:13px}footer{padding:35px 0;color:#69806e;font-size:13px}@media(max-width:700px){main{padding:0 24px}.hero{padding:55px 0}.cards{grid-template-columns:1fr;gap:0}#start{padding:24px}nav span{display:none}}a{color:inherit}button,.button{display:inline-block;background:#244d3d;color:#fff;border:1px solid #244d3d;border-radius:7px;padding:12px 22px;font:inherit;cursor:pointer;text-decoration:none}button:disabled{opacity:.5;cursor:default}button.quiet{background:transparent;color:#385c49;border-color:#cad5c9}.brand-link{text-decoration:none;font-weight:700}.nav-links{display:flex;gap:24px}.nav-links a{text-decoration:none}.nav-links a[aria-current]{border-bottom:2px solid #64806b}.workspace{max-width:780px;margin:60px auto;min-height:60vh}.workspace h1{font-size:clamp(30px,4vw,48px)}.welcome{padding:24px 0 60px}.welcome p{max-width:620px}.lesson-heading,.actions,.library article{display:flex;justify-content:space-between;align-items:center;gap:15px}.actions{justify-content:flex-start;flex-wrap:wrap;margin-top:18px}.exercise{margin-top:30px}.source{font-size:14px}.example,.feedback,.answer-saved,.hint{background:#edf1e7;border-radius:12px;padding:24px 30px;margin:26px 0}.example blockquote,.feedback blockquote{margin:16px 0;color:#254837;font-size:21px}.exercise p,.exercise blockquote{white-space:pre-wrap;overflow-wrap:anywhere}.prompt{font-size:19px;color:#213b34}.exercise textarea{width:100%;resize:vertical;border:1px solid #a9baa7;border-radius:8px;padding:18px;background:#fffefa;font:18px/1.6 system-ui;color:#213b34}.feedback{border-left:3px solid #65846a}.error{background:#f9e8df;padding:15px 22px;border-radius:8px;margin-top:20px}.error p{color:#793e2c}.working{padding:18px 0}.library article{border-bottom:1px solid #d8ded4;padding:20px 0}.library h2{font-size:21px;margin:0}.account-data{margin-top:65px;border-top:1px solid #d8ded4;padding-top:30px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}button:focus-visible,a:focus-visible,textarea:focus-visible{outline:3px solid #94ac78;outline-offset:4px}@media(max-width:700px){.nav-links{gap:13px;font-size:14px}.workspace{margin:35px auto}.example,.feedback,.answer-saved{padding:20px}.library article{align-items:flex-start}}
