.rr-page {margin:0;font-family:"BIZ UDPGothic","Hiragino Sans","Yu Gothic",Meiryo,sans-serif;font-size:16px;line-height:1.85;color:#161616;background:#fffdf3}
.rr-page .main,.rr-page .main *{box-sizing:border-box}
.rr-page .skip-link{position:absolute;left:-9999px;top:0;z-index:100;background:white;padding:12px;border:3px solid #161616}.rr-page .skip-link:focus{left:10px;top:10px}
.rr-page .breadcrumb{max-width:1080px;padding:8px 24px;margin:auto;font-size:16px;box-sizing:border-box}.rr-page .breadcrumb ol{display:flex;flex-wrap:wrap;gap:6px;list-style:none;padding:0;margin:0}.rr-page .breadcrumb li+li:before{content:"＞";margin-right:6px;color:#555}.rr-page .breadcrumb a{display:inline-flex;min-height:44px;align-items:center;color:#1f4e79}
.rr-page .main {max-width:1080px;margin:0 auto;padding:28px 24px 56px}
.rr-page .main h1,.rr-page .main h2,.rr-page .main h3 {line-height:1.5;color:#1f4e79;overflow-wrap:anywhere}
.rr-page h1 {font-size:clamp(30px,5vw,48px);margin:8px 0 24px}.rr-page h2{font-size:25px;margin-top:40px}.rr-page h3{font-size:20px}
.rr-page .main a{color:#1f4e79;text-underline-offset:4px}.rr-page p{overflow-wrap:anywhere}
.rr-hero{display:grid;grid-template-columns:1.4fr 1fr;gap:30px;background:#ffe14d;border:3px solid #161616;border-radius:18px;box-shadow:7px 7px 0 #161616;padding:36px;margin-bottom:32px}
.rr-hero h1{color:#161616;margin:8px 0 14px}.rr-kicker{font-weight:700;color:#61400a;margin:0}.rr-catch{font-size:clamp(24px,3.1vw,36px);font-weight:800;line-height:1.55;margin:10px 0 20px}
.rr-hero-art{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px}.rr-hero-art span{display:block;background:#fff;border:3px solid #161616;border-radius:10px;padding:8px 14px;font-size:clamp(17px,2vw,23px);font-weight:700;box-shadow:3px 3px 0 #161616;white-space:nowrap}.rr-hero-art img{margin-top:12px}.rr-hero-art b{font-size:21px}
.rr-actions{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin:22px 0}.rr-btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:10px 18px;border:2px solid #161616;border-radius:10px;background:white;box-shadow:3px 3px 0 #161616;color:#161616!important;font:inherit;font-weight:700;text-decoration:none;cursor:pointer;line-height:1.5}.rr-btn:hover{background:#fff4b8}.rr-primary{background:#161616;color:#fff!important}.rr-primary:hover{background:#3b3b3b}.rr-btn:focus-visible,.rr-page summary:focus-visible,.rr-page input:focus-visible,.rr-page textarea:focus-visible{outline:3px solid #1f4e79;outline-offset:4px}
.rr-bubble{display:flex;align-items:center;gap:20px;margin:30px 0}.rr-bubble img{flex:0 0 88px}.rr-bubble p{background:#fff;border:2px solid #161616;border-radius:16px;padding:18px 22px;margin:0;font-weight:700}
.rr-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;list-style:none;padding:0!important;margin:24px 0}.rr-card{position:relative;background:white;border:2px solid #161616;border-radius:14px;box-shadow:4px 4px 0 #e9ddaa;padding:24px;min-width:0}.rr-card h3{margin:10px 0}.rr-card p{margin:10px 0}.rr-number{font-size:25px;font-weight:800;color:#9c5e00}.rr-tag{display:inline-block;background:#fff4b8;border-radius:6px;padding:2px 9px;font-weight:700;font-size:16px}
.rr-start,.rr-note,.rr-reflect,.rr-lab{border:2px solid #161616;border-radius:14px;padding:24px;margin:28px 0;background:#fff4b8}.rr-start h2,.rr-note h2,.rr-reflect h2,.rr-lab h2{margin-top:0}.rr-note{background:#f4f7fb;border-color:#1f4e79}.rr-reflect{background:#fff7d1}.rr-lab{background:white}
.rr-problem{background:white;border:3px solid #161616;border-radius:16px;padding:30px;box-shadow:5px 5px 0 #ead791}.rr-statement{font-size:21px;font-weight:700;line-height:1.9}.rr-equations{border-left:5px solid #d08000;background:#fffaf0;padding:8px 24px;margin:24px 0}.rr-eq{font-size:clamp(19px,2.8vw,25px);font-weight:700;line-height:2;margin:8px 0;overflow-wrap:anywhere}
.rr-stage{border:2px solid #7b6b48;border-radius:12px;margin:16px 0;background:#fff}.rr-stage summary{padding:15px 18px;font-weight:700;font-size:18px;cursor:pointer;min-height:48px;box-sizing:border-box;background:#fff8de;border-radius:10px}.rr-stage>div{padding:6px 22px 20px}.rr-stage[open]{border-color:#161616}.rr-calc{padding-left:28px}.rr-calc li{padding:10px 2px;overflow-wrap:anywhere;border-bottom:1px solid #e7dfcf}.rr-answer,.rr-emphasis{font-size:21px;font-weight:700;background:#fff4b8;padding:16px;border-radius:8px}
.rr-page table{width:100%;border-collapse:collapse;table-layout:fixed;background:white;font-size:16px;margin:16px 0}.rr-page th,.rr-page td{border:1px solid #988968;padding:10px 8px;text-align:left;overflow-wrap:anywhere}.rr-page th{background:#fff4b8}.rr-table-wrap{width:100%}.rr-frac{display:inline-flex;vertical-align:middle;flex-direction:column;text-align:center;line-height:1.3;margin:0 3px;font-size:1em}.rr-frac>span:first-child{border-bottom:1px solid currentColor;padding:0 3px}.rr-frac>span:last-child{padding:0 3px}
.rr-form{border:2px dashed #9c5e00;padding:20px;border-radius:12px;background:#fffdf3;margin:24px 0}.rr-inputs{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:16px 0}.rr-inputs label{font-weight:700}.rr-page input[type=text],.rr-page textarea{display:block;width:100%;max-width:100%;box-sizing:border-box;padding:12px;border:2px solid #6d624d;border-radius:8px;font:inherit;font-size:18px;background:#fff;color:#161616}.rr-page textarea{resize:vertical;margin:8px 0}.rr-writing{display:block;margin:20px 0;font-weight:700}.rr-feedback{min-height:1.6em;font-weight:700}.rr-feedback[data-result=correct]{color:#215c28}.rr-feedback[data-result=wrong]{color:#9a3229}.rr-page input[type=range]{width:100%;min-height:44px;accent-color:#9c5e00}.rr-lab output{display:block;font-size:20px;font-weight:700;border:2px solid #161616;border-radius:8px;background:#fff4b8;padding:16px}.rr-dot-row{font-size:28px;display:flex;gap:10px;flex-wrap:wrap;margin:18px 0;letter-spacing:normal}.rr-dot-row span{overflow-wrap:anywhere}
.rr-page [hidden]{display:none!important}
@media(max-width:700px){.rr-page .main{padding:18px 16px 40px}.rr-hero{grid-template-columns:1fr;padding:24px;gap:12px}.rr-hero-art{flex-direction:row;flex-wrap:wrap;gap:10px}.rr-hero-art img{width:80px;height:80px}.rr-hero-art b{font-size:18px}.rr-grid{grid-template-columns:1fr}.rr-card{padding:20px}.rr-problem{padding:18px}.rr-bubble{gap:12px;align-items:flex-start}.rr-bubble img{width:60px;height:60px;flex-basis:60px}.rr-bubble p{padding:14px}.rr-stage>div{padding:6px 14px 18px}.rr-start,.rr-note,.rr-lab,.rr-reflect{padding:18px}.rr-page th,.rr-page td{padding:8px 5px}.rr-inputs{gap:10px}.rr-equations{padding:8px 14px}.rr-page h2{font-size:23px}}