:root{color-scheme:light;--navy:#142c46;--blue:#1764c0;--bg:#f4f6fa;--line:#dce3ec}*{box-sizing:border-box}body{margin:0;font:17px/1.65 system-ui,-apple-system,Segoe UI,sans-serif;color:var(--navy);background:var(--bg)}a{color:var(--blue);text-underline-offset:4px}header{background:#fff;padding:24px max(5vw,20px);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:flex;align-items:center;gap:14px;font-size:36px;font-weight:800;text-decoration:none;color:var(--navy)}.brand span{font-size:18px}.brand small{display:block;font-size:10px;letter-spacing:3px;color:#617086}nav{display:flex;flex-wrap:wrap;align-items:center;gap:22px}nav a{font-size:15px;text-decoration:none}nav form{margin:0}main{max-width:1120px;margin:64px auto;padding:0 24px;min-height:65vh}h1{font-size:clamp(32px,4.3vw,56px);letter-spacing:-1.8px;line-height:1.15;max-width:900px;margin:16px 0 24px}h2{font-size:25px;line-height:1.35;letter-spacing:-.5px}.lead{font-size:21px;max-width:780px;color:#52647c;margin-bottom:40px}.eyebrow{font-size:11px;letter-spacing:2px;color:var(--blue);font-weight:750}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px}.card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:30px;margin:24px 0;box-shadow:0 8px 35px #18365105}.grid .card{margin:0}.narrow{max-width:560px}.prose{max-width:850px;line-height:1.9}form{margin-top:22px}label{display:block;font-weight:600;margin:18px 0;font-size:15px}input,textarea,select{display:block;width:100%;font:inherit;line-height:1.5;padding:12px;border:1px solid #a6b6ca;border-radius:8px;background:#fff;color:var(--navy);margin-top:7px}textarea{min-height:150px}input:focus,textarea:focus,select:focus{outline:3px solid #a9d2ff;outline-offset:2px}.check{display:flex;align-items:flex-start;gap:10px;font-weight:400}.check input{width:18px;flex-shrink:0;margin-top:6px}button,.button{display:inline-block;background:var(--blue);color:#fff;border:0;border-radius:8px;padding:13px 20px;font:600 15px/1.4 system-ui;cursor:pointer;text-decoration:none}button:hover,.button:hover{background:#104c96}.link{background:transparent;color:var(--blue);padding:0;font-weight:400}.notice{padding:18px;background:#e6f5ed;border-left:4px solid #238761;border-radius:7px}.tabs{background:#e7edf6;padding:18px;border-radius:10px}.lesson{padding:15px 0;border-bottom:1px solid var(--line)}summary{cursor:pointer;font-weight:650}details form{padding-top:12px}footer{padding:28px max(5vw,20px);border-top:1px solid var(--line);font-size:13px;color:#687a91}progress{width:100%;accent-color:var(--blue)}@media(max-width:700px){header{align-items:flex-start;flex-direction:column}main{margin-top:36px}.card{padding:22px}nav{gap:14px}.brand span{font-size:16px}}