:root{font-family:system-ui,-apple-system,"Noto Sans KR",sans-serif;color:#173d33;background:#f5f7ef;line-height:1.65;font-synthesis:none}*{box-sizing:border-box}body{margin:0}a{color:#176c56;text-underline-offset:4px}header{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:20px max(22px,calc((100vw - 1260px)/2));border-bottom:1px solid #d9e4d6;background:#fff}header nav{display:flex;gap:18px;flex-wrap:wrap}.brand{font-size:20px;font-weight:850;text-decoration:none;white-space:nowrap}.brand span{font-weight:500;font-size:15px;margin-left:9px}main{max-width:1304px;margin:0 auto;padding:34px 22px 70px}h1{font-size:clamp(28px,4vw,42px);line-height:1.3;letter-spacing:-.04em;margin:12px 0 18px}h2{font-size:23px;line-height:1.45;margin:0 0 15px}h3{font-size:17px;margin:0 0 12px}p{margin:10px 0}.muted,.hint{color:#61766c}.hint{font-size:13px}.eyebrow{color:#4b8067;font-size:13px;font-weight:800;letter-spacing:.04em}.hero{padding:28px 32px;background:#e6efde;border:1px solid #d2e1c5;border-radius:24px;margin-bottom:25px}.hero p{max-width:850px}.stats{display:flex;flex-wrap:wrap;gap:9px;margin:20px 0 0}.badge{display:inline-block;font-size:12px;font-weight:750;padding:4px 10px;border-radius:99px;background:#e9f1e4;color:#386650}.stats .badge{background:#fff;padding:7px 12px}.filters{display:grid;grid-template-columns:minmax(180px,1fr) 165px 210px;gap:15px;align-items:end;margin:24px 0}.filters label,.control-grid label{display:grid;gap:6px;font-size:13px;font-weight:700}input,select,textarea,button{font:inherit}input,select,textarea{border:1px solid #b8cabe;border-radius:10px;background:#fff;padding:10px 12px;color:#163c30;min-width:0;width:100%}textarea{resize:vertical;min-height:95px;line-height:1.6}button,.button{display:inline-flex;align-items:center;justify-content:center;border:1px solid #bfd0c4;background:#fff;color:#176c56;border-radius:10px;padding:10px 15px;cursor:pointer;text-decoration:none;font-size:14px;font-weight:700;gap:7px}button:hover,.button:hover{background:#edf3e8}button.primary,.button.primary{color:#fff;background:#176c56;border-color:#176c56}button:disabled{opacity:.5;cursor:not-allowed}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid #d49b2e;outline-offset:3px}[hidden]{display:none!important}.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.card{padding:21px;background:#fff;border:1px solid #d7e2d4;border-radius:17px;display:flex;flex-direction:column;gap:8px}.card h2{font-size:19px;margin:0}.card a.title{color:#214b3d;text-decoration:none}.card .bottom{margin-top:auto;padding-top:13px}.card p{font-size:14px;color:#61766c}.card small{color:#6c7c73}.crumb{font-size:13px;margin-bottom:15px}.layout{display:grid;grid-template-columns:275px minmax(0,1fr);gap:22px;align-items:start}.panel{background:#fff;border:1px solid #d7e2d4;border-radius:19px;padding:23px;margin-bottom:20px}.side{position:sticky;top:18px}.side a.activity{display:block;padding:10px 12px;border-radius:9px;text-decoration:none;font-size:14px;margin-bottom:5px}.side a.activity[aria-current="page"]{background:#e4eedc;font-weight:800;color:#214b3d}.unit-title{font-size:18px}.controls{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin:19px 0}.controls select{flex:1;min-width:170px}.check{display:flex;align-items:center;gap:8px;font-size:14px}.check input{width:18px;height:18px}.compare-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.sentence-box{background:#f3f6ee;border:1px solid #dbe6d3;border-radius:15px;padding:19px;min-height:145px}.sentence-box.result{background:#ebf4ed;border-color:#bdd8c5}.sentence-box .label{font-size:12px;font-weight:800;color:#64816f;margin-bottom:13px}.sentence-text{font-size:clamp(18px,2.3vw,25px);line-height:1.8;overflow-wrap:anywhere;white-space:pre-wrap}.sentence-text mark{background:#cde3b3;color:#1b462b;border-radius:4px;padding:0 2px}.rule{border-left:3px solid #77a488;margin:18px 0 5px;padding:12px 16px;background:#f6f9f3;line-height:1.8}.feedback{min-height:25px;font-size:14px;margin:10px 0;color:#346849}.practice{margin-top:24px;border-top:1px solid #e0e7db;padding-top:22px}.practice label{font-size:14px;font-weight:750;display:block;margin-bottom:8px}.button-row{display:flex;gap:9px;flex-wrap:wrap;margin-top:13px}.pin{margin-top:18px;padding:16px;border:1px dashed #9dbda6;border-radius:12px;background:#f7f9f1}.pin p{font-size:15px}.section-list{padding-left:20px;font-size:13px}.source-link{font-size:13px}.control-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:13px}.tokens{display:flex;gap:8px;flex-wrap:wrap;margin:20px 0}.token{display:flex;flex-direction:column;border:1px solid #c5d9c6;background:#edf4e8;border-radius:10px;min-width:60px;text-align:center;padding:8px 12px;font-size:20px}.token small{font-size:11px;font-weight:700;color:#5c7865;border-top:1px solid #d1dfca;padding-top:4px;margin-top:4px}.timeline{width:100%;height:auto;background:#f6f8f0;border-radius:12px;margin:12px 0}.timeline text{fill:#57715e;font-family:inherit}.count-line{margin:18px 0;color:#61766c;font-size:14px}details summary{cursor:pointer;font-weight:700;font-size:14px}details p{font-size:13px}.empty{padding:35px;text-align:center;background:#fff;border-radius:18px}footer{border-top:1px solid #d6e3d3;padding:22px;text-align:center;color:#748578;font-size:12px}.order-row{display:flex;gap:8px;align-items:center;background:#f3f6ec;border-radius:10px;padding:10px;margin:8px 0}.order-row span{flex:1}.order-row button{padding:6px 12px}.assembly{display:flex;gap:6px;flex-wrap:wrap;margin:13px 0}.assembly button{padding:6px 10px;font-weight:500}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}.reading-audio{font-size:13px;margin:14px 0}.case-count{font-size:12px;color:#5b7864}#lesson-list{scroll-margin-top:20px}@media(max-width:1000px){.cards{grid-template-columns:repeat(2,minmax(0,1fr))}.layout{grid-template-columns:235px minmax(0,1fr)}.control-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:700px){header{align-items:flex-start;flex-direction:column;padding:16px 20px}header nav{font-size:13px;gap:14px}.brand{font-size:19px}main{padding:25px 16px 45px}.hero{padding:22px}.filters{grid-template-columns:1fr 1fr}.filters label:first-child{grid-column:1/-1}.cards{grid-template-columns:1fr}.layout{grid-template-columns:1fr}.side{position:static}.side .activities{display:flex;gap:6px;overflow:auto}.side a.activity{flex-shrink:0;max-width:230px;margin:0;border:1px solid #d7e4d1}.side .section-list,.side details{display:none}.compare-grid{grid-template-columns:1fr}.panel{padding:18px}.control-grid{grid-template-columns:1fr 1fr}.sentence-text{font-size:20px}.token{font-size:17px}.controls{gap:9px}.controls .check{width:100%}}

.side .activities{max-height:58vh;overflow:auto} @media(max-width:700px){.side .activities{max-height:none}}

.layout>*{min-width:0}.side .activities{max-width:100%}.panel,.control-grid>label,.compare-grid>*{min-width:0}.compare-grid{grid-template-columns:repeat(2,minmax(0,1fr))}@media(max-width:700px){.layout{grid-template-columns:minmax(0,1fr)}.compare-grid{grid-template-columns:minmax(0,1fr)}}