@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Manrope:wght@400;500;600;700;800&display=swap');
:root{--ink:#132e33;--muted:#647779;--bg:#f3f6f6;--line:#dce5e4;--lime:#d6ef68;--green:#176b57;--white:#fff}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 'DM Sans',sans-serif}h1,h2,h3,.brand{font-family:Manrope,sans-serif}h1{font-size:34px;line-height:1.25;letter-spacing:-1px;margin:0 0 12px}h2{font-size:23px;line-height:1.35;margin:0 0 16px}h3{font-size:18px;line-height:1.4;margin:0 0 10px}p{margin:0 0 16px}a{color:inherit;text-underline-offset:4px}button,input,select,textarea{font:inherit}button,.button{display:inline-flex;align-items:center;justify-content:center;gap:10px;border:1px solid var(--line);border-radius:9px;background:white;color:var(--ink);padding:12px 19px;cursor:pointer;text-decoration:none;font-weight:600;min-height:46px}button:hover,.button:hover{border-color:var(--green);filter:brightness(.98)}button:disabled{opacity:.5;cursor:not-allowed}.primary{background:var(--ink);border-color:var(--ink);color:white}.lime{background:var(--lime);border-color:var(--lime);color:var(--ink)}.text-button{border:0;padding:5px 0;background:transparent;color:var(--green)}:focus-visible{outline:3px solid #318fce;outline-offset:3px}.sidebar{position:fixed;inset:0 auto 0 0;width:245px;background:#102c31;color:#c5d6d7;padding:34px 22px;display:flex;flex-direction:column}.brand{display:flex;gap:12px;align-items:center;color:white;text-decoration:none;font-size:24px;font-weight:800;letter-spacing:1px}.brand-icon{background:var(--lime);color:var(--ink);border-radius:9px;width:41px;height:45px;text-align:center;font-size:36px;line-height:45px}.brand b{color:var(--lime)}.brand small{display:block;font:10px/1.8 'DM Sans',sans-serif;letter-spacing:2px;color:#afc4c5}.nav-label{font-size:12px;letter-spacing:2px;color:#97b0b1;margin:48px 12px 15px}nav{display:grid;gap:7px}nav a{display:flex;gap:13px;align-items:center;padding:12px 14px;text-decoration:none;border-radius:8px;font-size:18px}nav a span{font-size:14px;font-weight:500}nav a.active{background:#274447;color:#e4f79e}nav a:hover{background:#203c41}.side-bottom{margin-top:auto;padding:28px 12px 0;border-top:1px solid #385155}.side-bottom strong,.side-bottom small{display:block;margin-top:15px}.side-bottom small{color:#aac0c2;font-size:13px}.pill{font-size:12px;letter-spacing:.5px;border-radius:5px;padding:5px 8px;background:#284749;color:#e3edc4;font-weight:700}.workspace{margin-left:245px}header{height:81px;display:flex;align-items:center;justify-content:space-between;padding:0 42px;border-bottom:1px solid var(--line);background:#fff;font-size:14px}.header-label{font-size:11px;letter-spacing:2px;color:var(--muted)}main{max-width:1340px;margin:auto;padding:38px 42px 60px;min-height:calc(100vh - 150px)}.eyebrow{font-size:12px;font-weight:700;color:var(--green);letter-spacing:1.7px;margin-bottom:10px}.muted,small{color:var(--muted)}.intro{margin-bottom:28px}.hero-study{display:grid;grid-template-columns:1.5fr 1fr;background:#173a3e;color:white;border-radius:15px;overflow:hidden;margin-bottom:25px}.hero-copy{padding:32px}.hero-copy h2{font-size:27px;max-width:440px}.hero-copy p{color:#c0d4d5;max-width:420px}.hero-copy .eyebrow{color:var(--lime)}.hero-art{border-left:1px solid #39595c;padding:30px;display:flex;flex-direction:column;justify-content:center;background:linear-gradient(140deg,#21464a,#16383b)}.formula{font:600 35px Manrope,sans-serif;color:var(--lime);margin:12px 0}.hero-art small{color:#bad1d1}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:32px}.stat{background:white;border:1px solid var(--line);padding:21px 24px;border-radius:12px}.stat strong{font:800 28px Manrope,sans-serif;display:block}.stat span{font-size:14px;color:var(--muted)}.section-heading{display:flex;justify-content:space-between;align-items:center;gap:15px;margin:28px 0 17px}.section-heading h2{margin:0}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}.card{background:white;border:1px solid var(--line);border-radius:12px;padding:24px;min-width:0}.card p{color:var(--muted);font-size:14px}.card .number{font:700 13px Manrope,sans-serif;color:var(--green);margin-bottom:18px}.card a.text-button{font-size:14px}.row{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.spread{justify-content:space-between}.badge{display:inline-block;font-size:12px;padding:4px 9px;background:#eef4f1;border-radius:5px;color:#286854}.note{padding:16px 20px;border-left:3px solid #b7cc5e;background:#edf3db;border-radius:0 8px 8px 0;font-size:14px;margin:20px 0}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:22px 0}label{display:block;font-size:14px;font-weight:600}select,input[type=number],input[type=search],textarea{width:100%;padding:11px 12px;border:1px solid #c6d4d4;border-radius:7px;background:white;color:var(--ink);margin-top:7px}input[type=checkbox]{width:18px;height:18px;accent-color:var(--green)}.check{display:flex;gap:10px;align-items:center;margin:12px 0;font-weight:400}.question{max-width:860px;margin:auto}.question-title{font-size:22px;line-height:1.65;margin:25px 0;white-space:pre-line}.answers{display:grid;gap:12px}.answer{width:100%;justify-content:flex-start;text-align:left;font-weight:400;padding:15px 18px;line-height:1.5}.answer b{flex-shrink:0;display:grid;place-items:center;width:32px;height:32px;border:1px solid var(--line);border-radius:6px;font-size:14px}.answer.selected{background:#eef4dd;border-color:#7e993a}.answer.correct{border-color:#208061;background:#e7f6ed}.answer.wrong{border-color:#b9554c;background:#fff0ec}.explanation{padding:22px;border-radius:10px;background:#eef5f2;border:1px solid #bfd9cd;margin:22px 0}.explanation p{margin-bottom:8px}.progress-track{height:7px;border-radius:8px;background:#e1e9e7;overflow:hidden;margin:16px 0}.progress-track span{display:block;height:100%;background:var(--green)}.question-nav{display:flex;flex-wrap:wrap;gap:6px;margin:22px 0}.question-nav button{padding:4px;min-height:35px;width:35px;font-size:13px}.question-nav .done{background:#dae8e2}.question-nav .current{outline:2px solid var(--green)}details{border:1px solid var(--line);background:white;border-radius:10px;padding:18px 22px;margin:13px 0}summary{cursor:pointer;font-weight:700}details p{margin:15px 0}ul,ol{padding-left:23px}.lesson{max-width:890px}.lesson li{margin-bottom:9px}.formula-box{padding:19px 24px;background:#163a3e;color:#e4f6a7;border-radius:9px;font-size:19px;margin:22px 0;white-space:pre-line}.resource{display:flex;gap:18px;align-items:flex-start}.resource-icon{flex-shrink:0;display:grid;place-items:center;background:#edf2ea;color:var(--green);width:43px;height:43px;border-radius:8px;font-size:24px}.resource h3{font-size:16px}.resource p{font-size:13px;margin-bottom:6px}.table-wrap{overflow:auto}table{width:100%;border-collapse:collapse;font-size:14px;text-align:left}th,td{padding:13px;border-bottom:1px solid var(--line)}th{color:var(--muted)}.score{font:800 66px Manrope,sans-serif;color:var(--green)}.empty{padding:40px 20px;text-align:center;color:var(--muted)}footer{padding:18px 42px;border-top:1px solid var(--line);font-size:12px;color:var(--muted)}#toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);background:var(--ink);color:white;padding:12px 22px;border-radius:9px;display:none;z-index:9;max-width:90vw}.skip{position:absolute;top:-100px}.skip:focus{top:10px;z-index:10;background:white;padding:15px}.hidden{display:none!important}.backup{margin-top:28px;border-top:1px solid var(--line);padding-top:22px}.mono{font-variant-numeric:tabular-nums}
.answer:disabled{opacity:1;cursor:default}
@media(min-width:1500px){main{padding-top:50px}.hero-copy{padding:38px}.hero-study{min-height:270px}}@media(max-width:1100px){.sidebar{width:210px;padding:28px 15px}.workspace{margin-left:210px}main{padding:30px 25px}header{padding:0 25px}.grid{grid-template-columns:repeat(2,minmax(0,1fr))}.hero-art{padding:22px}.hero-copy{padding:26px}.formula{font-size:28px}}@media(max-width:760px){.sidebar{position:static;width:auto;padding:18px 20px}.brand{font-size:22px}.brand small{font-size:9px}.nav-label,.side-bottom{display:none}nav{display:flex;overflow:auto;margin:18px -10px -5px;gap:5px;padding:3px 3px 6px}nav a{white-space:nowrap;padding:9px 11px}nav a span{font-size:13px}.workspace{margin:0}header{height:52px;padding:0 20px;font-size:12px}.header-label{display:none}main{padding:25px 20px 40px}h1{font-size:28px}.hero-study{grid-template-columns:1fr}.hero-copy{padding:26px}.hero-art{display:none}.stats{gap:8px}.stat{padding:15px 12px}.stat strong{font-size:23px}.stat span{font-size:12px}.grid,.grid.two{grid-template-columns:1fr}.card{padding:21px}.form-grid{grid-template-columns:1fr;gap:14px}.section-heading h2{font-size:21px}.question-title{font-size:19px}.answer{padding:12px}.score{font-size:50px}footer{padding:18px 20px}.section-heading a{font-size:13px}.intro{margin-bottom:23px}}@media(prefers-reduced-motion:no-preference){button,a{transition:background .15s,border-color .15s}}