*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#f4f3ef;color:#222b2c;font:16px/1.7 Arial,"Malgun Gothic",sans-serif}a{color:inherit}header{padding:20px max(24px,calc((100vw - 1120px)/2));background:#202a2b;color:#fff;display:flex;justify-content:space-between;align-items:center;gap:20px}header>a:last-child{font-size:13px;color:#dae2dd}.brand{text-decoration:none}.brand small{font-size:10px;letter-spacing:2px;color:#e4bc67;display:block}.brand strong{font-size:20px}main{max-width:1120px;margin:auto;padding:0 24px}.hero{padding:66px 0 42px}.eyebrow{font-size:11px;letter-spacing:2px;color:#806228;font-weight:bold}h1{font-size:44px;line-height:1.3;letter-spacing:-1.5px;margin:17px 0}p{color:#626c6b}.hero p{font-size:16px}.stats{display:flex;gap:34px;flex-wrap:wrap;margin-top:30px;font-size:12px;color:#687370}.stats b{font-size:24px;color:#233b36;margin-right:5px}.tabs{display:flex;gap:12px;border-bottom:1px solid #cad0ca;padding-bottom:18px}.tabs a{text-decoration:none;background:#fff;padding:10px 18px;border:1px solid #bfc9c4;border-radius:5px;font-weight:bold}.tabs span{color:#73847b;font-size:12px;margin-left:10px}.grade-group{scroll-margin-top:20px;margin:38px 0}.group-title{display:flex;align-items:center;justify-content:space-between;gap:12px}.group-title h2{font-size:24px}.group-title>span{color:#738078;font-size:12px}.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.book{background:#fff;border:1px solid #d6dcd5;padding:23px;display:flex;flex-direction:column;border-radius:7px}.book h3{font-size:20px;margin:12px 0 17px}.pill{font-size:10px;letter-spacing:.3px;color:#506d60;background:#eef3ed;padding:3px 8px;border-radius:3px;align-self:start}.lessons{flex:1}.lessons p{display:flex;gap:12px;font-size:13px;margin:11px 0}.lessons b{font-size:16px;color:#b38a3e}.lessons small{display:block;font-size:11px;color:#88908b;margin-top:4px}.open{display:flex;justify-content:space-between;margin-top:22px;padding:10px 0;border-top:1px solid #dbe0da;text-decoration:none;font-size:13px;font-weight:bold;color:#244a3a}.open:hover{color:#946713}.guide{border-top:1px solid #cdd4cd;padding-top:20px;margin-top:50px}.guide h2{font-size:23px}.guide>div{display:grid;grid-template-columns:repeat(3,1fr);gap:25px;font-size:13px}.guide b{color:#263b33}.scope{padding:20px;background:#e9ede6;font-size:13px;margin:28px 0 45px}footer{padding:25px;text-align:center;border-top:1px solid #d1d7cf;font-size:11px;color:#7c857f}a:focus-visible{outline:3px solid #bd932c;outline-offset:4px}.source{max-width:900px;padding-top:35px}.source h1{font-size:30px}.source table{border-collapse:collapse;width:100%;font-size:13px}.source td,.source th{border:1px solid #cfd6ce;padding:10px;vertical-align:top;text-align:left}.source section{scroll-margin-top:25px;margin:35px 0}.source li{margin:8px 0}.source code{overflow-wrap:anywhere}@media(max-width:900px){.cards{grid-template-columns:repeat(2,1fr)}}@media(max-width:600px){header{padding:16px}.brand strong{font-size:17px}main{padding:0 17px}.hero{padding:35px 0 30px}h1{font-size:32px}.stats{gap:14px}.stats b{font-size:20px}.cards{grid-template-columns:1fr}.guide>div{grid-template-columns:1fr;gap:0}.tabs a{padding:9px 12px;font-size:13px}.group-title h2{font-size:21px}.source table{font-size:11px}.source td,.source th{padding:6px}}
.tabs{flex-wrap:wrap}
