:root{--green:#159947;--dark:#142a3d;--muted:#657689;--line:#e2e9ee;--bg:#f7faf9;--white:#fff;--red:#bc3c43}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,system-ui,-apple-system,"Segoe UI",Arial,sans-serif;background:var(--bg);color:var(--dark);line-height:1.6}a{color:#087a37;text-decoration:none}a:hover{text-decoration:underline}.container{max-width:1180px;margin:0 auto;padding:0 22px}.site-header{background:#fff;border-bottom:1px solid var(--line)}.nav{display:flex;justify-content:space-between;align-items:center;min-height:76px;gap:20px}.brand{font-weight:850;font-size:22px;color:var(--dark)}.brand-x{color:var(--green);font-size:32px;margin-right:3px}.nav nav{display:flex;align-items:center;gap:22px;font-size:14px}.button{display:inline-flex;justify-content:center;align-items:center;padding:11px 19px;border:1px solid var(--green);border-radius:9px;background:var(--green);color:#fff;font-weight:750;cursor:pointer;font:inherit;font-weight:750}.button:hover{background:#087c36;color:#fff;text-decoration:none}.button-small{padding:8px 14px}.button-wide{width:100%}.button-outline{color:#087a37;background:#fff}.button-outline:hover{background:#effaf3;color:#087a37}.breadcrumbs{padding:24px 0 16px;font-size:12px;color:var(--muted)}.breadcrumbs a{color:#087a37}.intro{margin-bottom:25px}.intro h1{font-size:clamp(30px,4vw,42px);line-height:1.15;margin:13px 0}.intro p{color:var(--muted);margin:0 0 12px}.eyebrow{display:inline-block;color:#087a37;background:#eaf7ef;border-radius:25px;padding:5px 10px;font-size:12px;font-weight:800}.count,.tag{display:inline-block;background:#eef5f0;color:#087a37;border-radius:7px;padding:5px 9px;font-size:12px;font-weight:750}.layout{display:grid;grid-template-columns:minmax(0,1.65fr) minmax(260px,.85fr);gap:22px;align-items:start}.main-column,.sidebar{min-width:0}.sidebar{display:grid;gap:20px}.card{background:#fff;border:1px solid var(--line);border-radius:15px;padding:22px;box-shadow:0 5px 18px rgba(18,45,55,.035);margin-bottom:22px}.card h2{font-size:21px;margin:0 0 15px}.question-item{padding:18px 0;border-top:1px solid var(--line)}.question-item h3{font-size:17px;font-weight:650;line-height:1.55;margin:7px 0}.question-item h3 a{color:var(--dark)}.question-item h3 a:hover{color:#087a37}.small{font-size:12px}.muted{color:var(--muted)}.text-link{font-size:13px;font-weight:800}.pagination{display:flex;align-items:center;justify-content:space-between;gap:12px;border-top:1px solid var(--line);padding-top:20px}.pagination span{font-size:13px;color:var(--muted)}.category-title{margin:20px 0 5px;font-size:14px}.link-list{display:grid}.link-list a{padding:10px 0;border-bottom:1px solid var(--line);font-size:13px;overflow-wrap:anywhere}.signup{background:#f1fbf4}.signup .button{width:100%}.question-detail h1{font-size:clamp(24px,3vw,34px);line-height:1.25;margin:14px 0 23px}.question-top{display:flex;justify-content:space-between;align-items:center}.question-body{font-size:17px;line-height:1.85;margin:22px 0 28px;overflow-wrap:anywhere}.question-body img,.alternative img,.explanation img{max-width:100%;height:auto}.question-body table,.alternative table{max-width:100%;display:block;overflow-x:auto;border-collapse:collapse}.question-body td,.question-body th{border:1px solid var(--line);padding:8px}.answer-form,.answer-list{display:grid;gap:12px}.alternative{display:flex;align-items:flex-start;gap:12px;padding:14px;border:1px solid var(--line);border-radius:10px;cursor:pointer}.alternative:has(input:checked){border-color:var(--green);background:#f0fbf4}.alternative input{margin-top:7px;accent-color:var(--green)}.alternative-letter{flex:0 0 28px;height:28px;border-radius:50%;background:#eef4f1;color:#087a37;display:grid;place-items:center;font-size:13px;font-weight:800}.alternative-content{flex:1;min-width:0;overflow-wrap:anywhere}.alternative-content p{margin:0 0 7px}.alternative-content p:last-child{margin-bottom:0}.metadata{display:grid;gap:9px}.metadata>div{padding:11px;background:#f5f9f7;border-radius:8px}.metadata span{display:block;font-size:11px;color:var(--muted);font-weight:750}.metadata a{display:block;font-size:13px;font-weight:650;overflow-wrap:anywhere}.related a{color:var(--dark)}.signup-inline{padding:24px;border-radius:13px;background:#eefaf2;margin-top:30px}.signup-inline h2{margin:0 0 6px;font-size:21px}.signup-inline p{margin:0 0 15px;color:#4c6959}.result-success{color:#087a37}.result-error{color:var(--red)}.is-correct{background:#effaf3;border-color:#62bd7c}.is-wrong{background:#fff2f2;border-color:#e4a0a0}.answer-label{display:block;margin-top:8px;font-size:12px}.explanation{margin-top:25px;border-top:1px solid var(--line);padding-top:20px}.action-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}.notice{padding:15px;background:#fff7e9;border-radius:8px}.footer{border-top:1px solid var(--line);padding:35px 0;margin-top:45px;color:var(--muted);font-size:13px}.footer a{margin-left:15px}
@media(max-width:800px){.layout{grid-template-columns:1fr}.sidebar{grid-template-columns:1fr 1fr}.nav nav{gap:10px}.card{padding:18px}}@media(max-width:570px){.container{padding:0 14px}.sidebar{grid-template-columns:1fr}.nav nav a:not(.button){display:none}.brand{font-size:19px}.question-body{font-size:16px}.action-row .button{width:100%}.pagination{flex-wrap:wrap}}