*{box-sizing:border-box}body{margin:0;background:#fffdf7;color:#161616;font-family:"BIZ UDPGothic","Hiragino Sans",Meiryo,sans-serif;font-size:16px;line-height:1.8}.skip-link{position:absolute;left:12px;top:-100px;z-index:100;background:white;padding:12px;color:#1f4e79}.skip-link:focus{top:8px}.breadcrumb{max-width:980px;margin:16px auto 0;padding:0 20px;font-size:16px}.breadcrumb ol{display:flex;flex-wrap:wrap;gap:6px 10px;list-style:none;margin:0;padding:0}.breadcrumb li+li::before{content:'›';margin-right:10px;color:#666}.breadcrumb a{color:#1f4e79}.breadcrumb a:focus-visible{outline:3px solid #6a1b9a;outline-offset:4px}
.sk-main{max-width:980px;margin:0 auto;padding:24px 20px 56px;font-size:18px;line-height:1.85;overflow-wrap:anywhere;color:#161616;font-family:"BIZ UDPGothic","Hiragino Sans",Meiryo,sans-serif}
.sk-main h1{font-size:clamp(32px,6vw,48px);line-height:1.4;margin:12px 0 24px}
.sk-main h2{font-size:clamp(23px,3vw,29px);line-height:1.55;margin:12px 0 20px}
.sk-main h3{font-size:21px;line-height:1.6;margin:6px 0 12px}
.sk-main section{margin-bottom:32px}.sk-main p{margin:12px 0}.sk-main a{color:#1f4e79;text-underline-offset:4px}
.sk-hero{background:#fff4b8;border:3px solid #161616;border-radius:20px;padding:32px;box-shadow:7px 7px 0 #161616}
.sk-kicker{font-weight:700;color:#6a1b9a;font-size:16px}.sk-lead{font-weight:700;font-size:clamp(22px,4vw,30px);line-height:1.65}
.sk-panel{padding:24px;border:2px solid #161616;border-radius:16px;background:#fff;box-shadow:4px 4px 0 #e8dcf0}
.sk-actions{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin:22px 0}
.sk-main button,.sk-button,.sk-pill{font:inherit;font-weight:700;padding:12px 18px;min-height:48px;border:2px solid #161616;border-radius:10px;cursor:pointer;line-height:1.5;background:#ffe14d;color:#161616;display:inline-flex;align-items:center;justify-content:center;text-align:center;text-decoration:none}
.sk-main a.sk-button{color:#161616}.sk-main a.sk-pill{font-size:16px;background:#f4edf9;color:#512071}
.sk-main .sk-secondary{background:#fff}.sk-main button:hover,.sk-main .sk-button:hover{background:#fff4b8}
.sk-main :focus-visible{outline:3px solid #6a1b9a;outline-offset:4px}
.sk-main button[aria-pressed=true]{background:#6a1b9a;color:white;border-color:#6a1b9a}
.sk-chapters{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.sk-main a.sk-chapter{color:#161616;text-decoration:none;display:flex;gap:16px;border:2px solid #161616;border-radius:14px;padding:22px;background:#fff}
.sk-main a.sk-chapter:hover{background:#fff4b8}.sk-chapter p{font-size:16px;margin:5px 0}.sk-chapter span:last-child{font-size:16px;color:#6a1b9a;font-weight:700}
.sk-number{font-size:26px!important;font-weight:800;color:#6a1b9a;line-height:1.5}.sk-route{display:flex;flex-wrap:wrap;gap:12px;margin:20px 0}.sk-route span{padding:8px 12px;background:#f4edf9;border-radius:8px;font-size:16px}
.sk-tiles{display:flex;justify-content:center;gap:16px;margin:26px 0}.sk-tiles span{padding:12px 20px;background:#efe0f9;border:2px solid #6a1b9a;border-radius:8px;font-weight:700;font-size:26px}.sk-tiles span:nth-child(2){background:#fff4b8;border-style:dashed;border-color:#161616}
.sk-main details{border:2px solid #d9c4e6;border-radius:10px;margin:20px 0;padding:0 18px;background:#faf7fc}.sk-main summary{font-size:18px;cursor:pointer;font-weight:700;padding:14px 0;min-height:48px;color:#512071}.sk-main details[open]{padding-bottom:18px}
.sk-math{font-family:inherit;font-weight:650;line-height:2.1;overflow-wrap:anywhere}.sk-math sup{font-size:.8em;line-height:0}.sk-frac{display:inline-flex;vertical-align:middle;flex-direction:column;align-items:stretch;text-align:center;line-height:1.45;margin:3px 4px;font-size:1em}.sk-frac>span{padding:1px 7px}.sk-frac>span:first-child{border-bottom:2px solid currentColor}
.sk-equation{font-size:22px;background:#f4edf9;padding:16px;border-radius:10px}.sk-prompt{font-size:23px;line-height:1.9}.sk-small-heading{font-size:18px!important;color:#6a1b9a}
.sk-answer{padding:14px 18px;background:#fff4b8;border-radius:10px;font-size:21px}.sk-note{border-left:5px solid #6a1b9a;padding:12px 16px;background:#f4edf9;margin:24px 0;font-size:18px}
.sk-steps{padding-left:26px}.sk-steps li{margin:12px 0;padding-left:8px}.sk-question-list{list-style:none;padding:0}.sk-question-list>li{padding:20px 0;border-bottom:1px solid #d7cadc}.sk-question-list>li>a{font-size:21px;font-weight:700;display:inline-block;min-height:44px;padding:6px 0}.sk-question-list p{margin:8px 0}.sk-level{display:inline-block;background:#f4edf9;color:#512071;padding:2px 9px;border-radius:6px;margin-left:12px;font-size:16px}
.sk-main input[type=number]{width:90px;min-height:46px;padding:8px;font:inherit;border:2px solid #6a1b9a;border-radius:8px}
.sk-selfcheck{margin:24px 0 0;padding:16px;border:1px solid #b597c8;border-radius:8px}.sk-selfcheck button{margin:8px 4px 0 0;font-size:16px}.sk-selfcheck legend{font-size:16px;font-weight:700}.sk-status{font-size:16px}.sk-feedback{font-weight:700;color:#512071}
.sk-writing-space{height:110px;border-bottom:1px dashed #888}.sk-paper-problem{margin:20px 0;break-inside:avoid}.sk-paper-section{margin-top:40px}.sk-paper-answers>summary{padding:16px}
@media(max-width:640px){.sk-main{padding:18px 16px 40px}.sk-hero{padding:22px 18px}.sk-panel{padding:20px 16px}.sk-chapters{grid-template-columns:1fr}.sk-main a.sk-chapter{padding:18px}.sk-actions>*{max-width:100%}.sk-prompt{font-size:21px}.sk-tiles{gap:10px}.sk-tiles span{padding:10px 16px}.sk-selfcheck button{width:100%;margin-right:0}.sk-equation{font-size:19px;padding:12px}}
@media print{body{background:white!important;color:black!important}body>header,body>nav,body>footer,.breadcrumb,.skip-link,.sk-print-controls,.sk-print-help,.sk-status,.sk-selfcheck{display:none!important}.sk-main{max-width:none;padding:0;font-size:16px;line-height:1.7}.sk-main h1{font-size:28px}.sk-paper-section{break-before:page}.sk-paper-section:first-child{break-before:auto}.sk-main .sk-paper-questions{display:block}.sk-main .sk-paper-answers{display:none}.sk-main h2{font-size:22px}.sk-main h3{font-size:18px}.sk-writing-space{height:72px}.sk-paper-problem p{margin:6px 0}.sk-paper-problem{margin:14px 0}.sk-steps li{margin:4px 0}body[data-print-mode=answers] .sk-paper-questions{display:none}body[data-print-mode=answers] .sk-paper-answers{display:block;border:0;background:white;padding:0}body[data-print-mode=answers] .sk-paper-answers>summary{display:none}.sk-math{line-height:1.7}@page{size:A4;margin:16mm}}