:root{--ink:#183e43;--muted:#718082;--green:#236759;--paper:#fafaf7;--line:#e3e8e2}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.65 system-ui,-apple-system,sans-serif}button,a,textarea{-webkit-tap-highlight-color:transparent}button{font:inherit;cursor:pointer}a{color:inherit;text-decoration:none}header{height:82px;max-width:1180px;margin:auto;padding:0 28px;display:flex;align-items:center;justify-content:space-between}header>span{font-size:10px;letter-spacing:3px;color:var(--muted)}.brand{display:flex;align-items:center;gap:8px;font-size:23px;font-weight:750}main{max-width:1124px;margin:auto;padding:0 28px}.hero{height:470px;position:relative;border-radius:24px;overflow:hidden;background:#19464b;color:white}.hero>img{width:100%;height:100%;object-fit:cover;object-position:center 45%}.hero-shade{position:absolute;inset:0;background:linear-gradient(90deg,rgba(9,40,45,.87),rgba(9,40,45,.44) 48%,rgba(9,40,45,.04))}.hero-copy{position:absolute;left:48px;top:46px}.hero small{letter-spacing:2px;font-size:11px;color:#e2e9d3}h1{font-size:54px;line-height:1.17;letter-spacing:-2px;font-weight:650;margin:20px 0}p{margin:14px 0}.hero p{color:#e3eae5;max-width:390px}.primary{border:0;border-radius:10px;padding:15px 24px;background:#dcefad;color:#234638;font-weight:700;margin-top:12px;min-height:50px}.primary span{margin-left:30px}.location{position:absolute;right:25px;bottom:22px;font-size:9px;letter-spacing:2px}.stats{display:grid;grid-template-columns:repeat(3,1fr);padding:28px 0;border-bottom:1px solid var(--line);margin-bottom:44px}.stats div{text-align:center;border-right:1px solid var(--line)}.stats div:last-child{border:0}.stats b{display:block;font-size:28px;font-weight:650}.stats span{font-size:12px;color:var(--muted)}.section-title{display:flex;align-items:center;justify-content:space-between;gap:12px}small{font-size:11px;letter-spacing:1px}.section-title small{color:var(--green);font-weight:700}h2{font-size:26px;letter-spacing:-.7px;margin:8px 0}.section-title button,.secondary{border:1px solid #cedbd4;padding:11px 18px;background:white;border-radius:10px;font-size:14px;color:var(--ink)}.muted{color:var(--muted);font-size:14px}.units{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:26px 0 46px}.unit{border:1px solid var(--line);background:white;border-radius:16px;padding:25px;text-align:left;color:var(--ink);position:relative;min-height:174px;transition:transform .15s,border-color .15s}.unit:hover:not(:disabled){transform:translateY(-3px);border-color:#76a594}.unit:disabled{cursor:default;background:#f3f5f1;color:#697b78}.unit-num{font-size:12px;letter-spacing:2px;color:var(--green);display:flex;justify-content:space-between}.unit h3{font-size:20px;margin:16px 0 9px;font-weight:650}.unit p{font-size:12px;color:var(--muted);margin:0}.unit.active{border:2px solid #4a8271;background:#f3f8eb}.unit .status{position:absolute;right:24px;bottom:24px;font-size:20px}.practice{display:grid;grid-template-columns:1fr 1fr;gap:30px;padding:32px;border-radius:18px;background:#edf1eb;margin-bottom:25px}.practice p{font-size:14px}.practice textarea{width:100%;min-height:120px;padding:14px;border:1px solid #cbd8cd;border-radius:10px;font:inherit}.practice small{display:block}.guide{padding:22px 0;border-top:1px solid var(--line);font-size:13px}.guide a{text-decoration:underline}summary{cursor:pointer;font-weight:600}footer{max-width:1124px;margin:38px auto;padding:24px 28px;border-top:1px solid var(--line);font-size:12px;color:var(--muted)}footer p{margin:6px 0}footer small{font-size:10px;letter-spacing:0}#lesson{max-width:760px;margin:30px auto 80px}.lesson-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px}.lesson-top button{background:none;border:0;color:var(--muted);padding:12px}progress{width:100%;height:8px;accent-color:var(--green);border:0;border-radius:10px;margin-bottom:35px}.question{font-size:28px;margin:18px 0 26px;line-height:1.5}.answers{display:grid;gap:12px}.answer{padding:18px 22px;display:flex;gap:16px;align-items:center;border:1px solid #d9e0d9;border-radius:12px;background:white;color:var(--ink);text-align:left;min-height:64px}.answer span{font-size:12px;border:1px solid #dce3db;border-radius:7px;padding:3px 9px}.answer:hover:not(:disabled){background:#edf4e7}.answer.correct{border:2px solid #26785a;background:#edf6e9}.answer.wrong{border:2px solid #b95b49;background:#fff1ea}.feedback{padding:22px;border-radius:12px;background:#edf2e9;margin-top:24px}.result{text-align:center;padding:30px 0}.score{font-size:72px;color:var(--green);line-height:1.2;margin:24px}.result .primary{display:block;margin:20px auto}.result p{max-width:520px;margin:18px auto}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #bc8432;outline-offset:4px}[hidden]{display:none!important}@media(max-width:650px){header{height:68px;padding:0 20px}header>span{display:none}main{padding:0 16px}.hero{height:480px;border-radius:18px}.hero-copy{left:25px;top:35px;right:20px}h1{font-size:44px}.hero-shade{background:linear-gradient(90deg,rgba(9,40,45,.85),rgba(9,40,45,.27))}.hero p{font-size:14px;max-width:270px}.hero>img{object-position:60%}.stats{margin-bottom:28px}.stats b{font-size:24px}.stats span{font-size:10px}h2{font-size:21px}.section-title{align-items:flex-end}.section-title button{font-size:12px;padding:9px;white-space:nowrap}.units{grid-template-columns:1fr;gap:12px}.unit{min-height:143px;padding:21px}.unit h3{margin:11px 0 5px}.practice{grid-template-columns:1fr;padding:24px;gap:12px}.question{font-size:24px}#lesson{margin-top:16px}.answer{padding:16px}.location{font-size:8px}.section-title small{font-size:9px}}@media(prefers-reduced-motion:reduce){*{transition:none!important}}
