:root{--green:#185b4b;--dark:#193c33;--muted:#7b827b;--bg:#f6f7f2;--line:#e4e8df;--lime:#dcecae;--paper:#fff;--orange:#b96839}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:#283d34;font:15px/1.7 "Microsoft YaHei","PingFang SC",sans-serif}button,input,textarea{font:inherit}button,a,input,textarea{outline-offset:5px}button{cursor:pointer}button{transition:background .18s,transform .18s}button:hover{filter:brightness(.97)}a{color:inherit}.sidebar{position:fixed;width:254px;inset:0 auto 0 0;background:#fbfcf8;border-right:1px solid var(--line);padding:36px 22px;display:flex;flex-direction:column;z-index:3}.brand{display:flex;align-items:center;gap:11px;text-decoration:none;font-size:23px;font-weight:bold;letter-spacing:1px;white-space:nowrap}.brand small{display:block;font:8px/2 sans-serif;letter-spacing:2px;color:#81897f}.brand-icon{background:var(--green);border-radius:12px;width:42px;height:46px;color:#e7f0c5;font:32px/44px 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@media(min-width:1500px){main{padding-top:44px}.hero{padding:40px}.hero h2{font-size:32px}}
@media(max-width:1150px){.sidebar{width:215px;padding:30px 16px}.workspace{margin-left:215px}main{padding:28px}.topbar{padding:0 28px}.hero{padding:27px}.hero h2{font-size:25px}.stat{padding:14px;gap:10px}.brand{font-size:20px}.brand small{font-size:7px}.hero-art svg{min-height:170px}}
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.top-actions{display:flex;gap:8px}.heading-row>div{min-width:0}
.difficulty-bar{display:flex;justify-content:space-between;align-items:center;gap:18px;background:#eef3e5;border:1px solid #d9e3cb;border-radius:10px;padding:16px 20px;margin-bottom:26px}.difficulty-bar strong{font-size:13px}.difficulty-bar p{margin:3px 0 0;color:#65755c;font-size:11px}.difficulty-buttons{display:flex;flex-shrink:0;gap:5px;background:#fff;padding:4px;border:1px solid #d9e3cb;border-radius:8px}.difficulty-buttons button{border:0;border-radius:5px;padding:9px 15px;background:transparent;color:#62745c;font-size:12px;white-space:nowrap}.difficulty-buttons button[aria-pressed="true"]{background:var(--green);color:white}.difficulty-tag{display:inline-block;font-size:10px;padding:1px 7px;border:1px solid #d9dec5;background:#f2f5e7;color:#708048;border-radius:4px;margin-right:5px}
@media(max-width:760px){.difficulty-bar{align-items:flex-start;flex-direction:column;padding:14px;gap:10px;margin-bottom:20px}.difficulty-buttons{width:100%}.difficulty-buttons button{flex:1}.q-head p{overflow-wrap:anywhere}}
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