:root{color-scheme:light}*{box-sizing:border-box}body{margin:0;font-family:system-ui,sans-serif;line-height:1.75;color:#1e293b;background:#f8fafc}header,main,footer{max-width:1100px;margin:auto;padding:24px}header{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;border-bottom:1px solid #dbe3ef}nav{display:flex;gap:20px;flex-wrap:wrap}.brand{font-size:1.4rem;font-weight:800;color:#172554}a{color:#1d4ed8;text-underline-offset:3px}a:focus-visible{outline:3px solid #0284c7;outline-offset:4px}h1{font-size:clamp(1.8rem,5vw,2.7rem);line-height:1.2;color:#172554}h2,h3{line-height:1.4;color:#172554}article,.card{background:white;border:1px solid #dbe3ef;border-radius:16px;padding:24px}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,290px),1fr));gap:20px}.eyebrow,.crumbs{font-size:.9rem;color:#475569}.lead{font-size:1.2rem}.button{display:inline-block;background:#172554;color:white;padding:12px 20px;border-radius:9px;margin:12px 0}figure{margin:24px 0}img{display:block;max-width:100%;height:auto;margin:auto}figcaption,footer{font-size:.9rem;color:#475569}.math{overflow-x:auto}ol,ul{padding-left:26px}.notice{border-left:4px solid #0284c7;padding:12px 20px;background:#eff6ff}footer{border-top:1px solid #dbe3ef}.skip{position:absolute;left:-9999px}.skip:focus{left:16px;top:16px;background:white;padding:12px;z-index:2}
.quiz-question{background:white;border:1px solid #dbe3ef;border-radius:16px;padding:24px;margin:24px 0}fieldset{border:0;padding:0;min-width:0}legend{font-weight:700;font-size:1.15rem;line-height:1.5;margin-bottom:16px}.quiz-choice{display:flex;align-items:flex-start;gap:10px;border:1px solid #cbd5e1;border-radius:10px;padding:12px;margin:10px 0;cursor:pointer}.quiz-choice input{margin-top:7px;flex:none;accent-color:#172554}.quiz-choice:has(input:checked){background:#eff6ff;border-color:#2563eb}.quiz-choice:focus-within{outline:3px solid #0284c7;outline-offset:2px}summary{cursor:pointer;color:#1d4ed8;font-weight:600;padding:12px 0}.quiz-right{border-left:5px solid #15803d}.quiz-wrong{border-left:5px solid #b45309}.quiz-actions{display:flex;gap:16px;flex-wrap:wrap;align-items:center}button{font:inherit;cursor:pointer}button[hidden]{display:none}.quiz-actions button[type=reset]{padding:12px 20px;border:1px solid #64748b;border-radius:9px;background:white;color:#172554}#quiz-result:not(:empty){padding:20px;border-left:4px solid #0284c7;background:#eff6ff;font-weight:600}.table-wrap{overflow-x:auto}table{border-collapse:collapse;width:100%;margin:24px 0;background:white}caption{text-align:left;font-weight:700}th,td{border:1px solid #cbd5e1;padding:12px;text-align:left;vertical-align:top}th{background:#eff6ff}[id]{scroll-margin-top:24px}