:root{--blue:#1260db;--navy:#142f53;--line:#dce5ef;--soft:#f2f6fb;--muted:#52667c}*{box-sizing:border-box}body{margin:0;color:var(--navy);font:16px/1.7 system-ui,-apple-system,"Segoe UI",sans-serif;background:#fff}a{color:#075dc8;text-underline-offset:3px;overflow-wrap:anywhere}button,input,select,textarea{font:inherit}button,.button{display:inline-block;border:1px solid #b6c9df;border-radius:9px;background:#fff;color:var(--navy);padding:9px 15px;cursor:pointer;text-decoration:none;line-height:1.5}button.primary,.button.primary{background:var(--blue);border-color:var(--blue);color:white}button:disabled{opacity:.55;cursor:wait}button:hover,.button:hover{box-shadow:0 2px 8px #133a6d20}:focus-visible{outline:3px solid #ffbd4c;outline-offset:3px}.wrap{max-width:1220px;margin:auto;padding:0 28px}.skip{position:absolute;left:-9999px}.skip:focus{left:10px;top:10px;background:white;padding:10px;z-index:9}header{border-bottom:1px solid var(--line);background:#fff}header .header{display:flex;align-items:center;gap:24px;flex-wrap:wrap;padding-top:18px;padding-bottom:18px}.brand{font-size:23px;font-weight:750;text-decoration:none;white-space:nowrap}.brand span{display:block;color:var(--muted);font-size:12px;font-weight:500}nav{display:flex;gap:18px;flex-wrap:wrap;flex:1}nav a{font-size:14px;text-decoration:none}#account{font-size:14px;max-width:100%;overflow-wrap:anywhere}main{min-height:60vh}h1{font-size:clamp(29px,4vw,46px);line-height:1.18;letter-spacing:-.03em}h2{font-size:25px;line-height:1.35}h3{font-size:19px;line-height:1.4}p{margin:12px 0 18px}.eyebrow,.meta{font-size:12px;color:var(--muted);letter-spacing:.06em}.hero{display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:30px;padding:48px 0 28px}.hero img{width:100%;height:auto;border-radius:16px}.hero .intro{font-size:19px;color:var(--muted)}.actions{display:flex;gap:10px;flex-wrap:wrap;align-items:center}.notice,.case-note{padding:16px 20px;background:#edf4ff;border:1px solid #d2e2fb;border-radius:10px;margin:20px 0}.warn{background:#fff7e7;border-color:#efd4a3}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;margin:24px 0}.card{border:1px solid var(--line);border-radius:13px;padding:22px;min-width:0}.card h2,.card h3{margin-top:6px}.card a.title{text-decoration:none}.card p{color:var(--muted)}.stats{display:flex;gap:28px;flex-wrap:wrap;margin:20px 0}.stats b{font-size:27px;display:block}.stats span{font-size:13px;color:var(--muted)}.toolbar{display:flex;gap:12px;flex-wrap:wrap;margin:24px 0}.toolbar input{flex:1;min-width:180px}.toolbar input,.toolbar select,input,textarea,select{padding:10px;border:1px solid #a9bfd6;border-radius:7px;max-width:100%;background:white;color:var(--navy)}.breadcrumbs{padding-top:24px;color:var(--muted);font-size:13px}.reading{display:grid;grid-template-columns:230px minmax(0,1fr);gap:34px;margin:32px 0}.toc{align-self:start;position:sticky;top:14px;background:var(--soft);border-radius:12px;padding:18px;font-size:14px}.toc a{display:block;margin:8px 0}.article{min-width:0;max-width:870px}.article h2{margin-top:35px}.article p{overflow-wrap:anywhere}.article pre{white-space:pre-wrap;overflow-wrap:anywhere}.formula{padding:18px;background:#f3f7fd;border-left:3px solid var(--blue);overflow-x:auto;margin:18px 0}.formula .katex-display{margin:0}.formula p{font-size:13px;color:var(--muted);margin-bottom:0}details{border:1px solid var(--line);border-radius:9px;padding:13px 16px;margin:14px 0}summary{cursor:pointer;font-weight:650}.tabs{display:flex;gap:8px;flex-wrap:wrap;border-bottom:1px solid var(--line);padding-bottom:14px;margin:20px 0}.tabs a,.tabs button{border:1px solid var(--line);border-radius:7px;padding:7px 13px;text-decoration:none;font-size:14px}.tabs .active{background:var(--blue);color:#fff}.review{border:1px solid #cadcf1;border-radius:12px;padding:18px;margin:30px 0;background:#f8fbff}.review h3{margin:0}.review p{font-size:14px}.review textarea{width:100%;min-height:100px;margin:12px 0}.review .status{font-size:13px}.muted{color:var(--muted)}.quiz-item{border:1px solid var(--line);border-radius:12px;margin:20px 0;padding:20px}.quiz-item legend{font-weight:700;padding:0 7px}.quiz-item label{display:flex;gap:10px;padding:8px 0;align-items:flex-start}.quiz-item input{margin-top:7px}.quiz-item:target,.review-focus{outline:3px solid #edb443}.answer{background:#edf6ef;border-radius:8px;padding:13px;margin-top:12px}.case-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.case-grid label{display:block;font-size:14px}.case-grid input,.case-grid select{width:100%;display:block;margin-top:6px}.case-results{border:1px solid var(--line);border-radius:12px;padding:20px;margin:22px 0;min-width:0}.table-scroll{overflow:auto;max-width:100%}table{width:100%;border-collapse:collapse;font-size:14px}th,td{padding:11px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}svg{max-width:100%;height:auto}.diagram{background:#f8fbff;padding:18px;overflow:auto;border-radius:10px}.diagram svg{min-width:560px;display:block;width:100%}.svt{font:12px sans-serif;fill:#28415f}.svkecil{font:10px sans-serif;fill:#355373}.svair{fill:#dceefd;stroke:#4f8cc3}.svbeton{fill:#e5e9ee;stroke:#526b85}.svmedia{fill:#b7d5e7}.svgaris,.svpipa{stroke:#1e62ac;fill:none;stroke-width:2}.svtanah{stroke:#826d4d;stroke-dasharray:5 3;fill:none}.svgalat{fill:#a83b29}.svok{fill:#226b40}.progress{height:7px;background:#e3ebf5;border-radius:7px;overflow:hidden}.progress span{display:block;height:100%;background:var(--blue)}.audio{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin:15px 0}.audio label{font-size:13px}li{margin:7px 0}footer{border-top:1px solid var(--line);margin-top:55px!important;padding-top:24px!important;padding-bottom:35px!important;color:var(--muted);font-size:13px}.error{color:#a52a25}.ok{color:#216842}.print-only{display:none}[hidden]{display:none!important}@media(max-width:850px){.grid{grid-template-columns:repeat(2,minmax(0,1fr))}.reading{grid-template-columns:1fr}.toc{position:static}.hero{grid-template-columns:1fr}.hero img{max-height:330px;object-fit:contain}.case-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:520px){.wrap{padding-left:18px;padding-right:18px}.header{gap:15px!important}.grid,.case-grid{grid-template-columns:1fr}.hero{padding-top:28px}.card{padding:18px}.stats{gap:18px}.toolbar>*{width:100%}.toc{font-size:13px}h1{font-size:32px}.formula{padding:12px}.quiz-item{padding:14px}}@media print{header,footer,.toc,.review,.tabs,.audio,.no-print,.toolbar{display:none!important}.wrap{max-width:none;padding:0}.reading{display:block}.article{max-width:none}.print-only{display:block}.print-chapter{break-before:page}.print-article{break-before:page}h1{font-size:27pt}h2{font-size:19pt;break-after:avoid}h3,summary{break-after:avoid}.formula,table{break-inside:avoid}.formula{overflow:visible}.diagram svg{min-width:0}.card{break-inside:avoid}.print-cover{padding:20mm 0}body{font-size:10.5pt;line-height:1.55}a{color:inherit;text-decoration:none}details{border:0;padding:0}.notice{border:1px solid #aaa;background:#f5f5f5}}