:root{--bg:#f5f5f0;--ink:#252e29;--muted:#7c837c;--line:#dfe3d9;--green:#506b54;--pale:#e9eee3;--white:#fffefa;--red:#9f5148;--red-bg:#f8eee8}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--bg);font:14px/1.6 -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif}button,input,select,textarea{font:inherit}button,a,label.file-label{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:wait;opacity:.55}button:focus-visible,a:focus-visible,select:focus-visible,input:focus-visible{outline:3px solid #9eb08e;outline-offset:3px}button{color:inherit}a{color:inherit;text-decoration:none}.app-shell{max-width:1760px;margin:auto;display:grid;grid-template-columns:236px minmax(0,1fr);min-height:100vh}.sidebar{position:sticky;top:0;height:100vh;padding:38px 23px 28px;border-right:1px solid var(--line);display:flex;flex-direction:column}.brand{display:flex;align-items:center;gap:12px;font-size:23px;font-weight:650;letter-spacing:3px}.brand 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@media(min-width:1500px){main{padding-inline:74px}.question-card{min-height:470px}}@media(max-width:1150px){main{padding-inline:30px}.app-shell{grid-template-columns:195px minmax(0,1fr)}.sidebar{padding-inline:18px}.practice-layout{grid-template-columns:minmax(0,1fr) 190px}.workspace-controls{gap:15px;flex-wrap:wrap}.question-card{padding:24px}.question-prompt{font-size:17px}.practice-aside .panel{padding:20px 16px}}@media(max-width:900px){.practice-layout{grid-template-columns:1fr}.practice-aside{display:none}.management-layout{grid-template-columns:1fr}.stat{padding-left:18px}.stat-number{font-size:25px}}@media(max-width:680px){.app-shell{display:block}.sidebar{position:relative;width:100%;height:auto;padding:18px 20px 0;border-right:0;border-bottom:1px solid var(--line)}.brand{font-size:20px}.brand-mark{width:34px;height:34px;font-size:19px}.brand small{font-size:8px}.nav-caption,.sidebar-bottom{display:none}nav{display:flex;margin-top:20px;gap:4px}.nav-item{flex:1;text-align:center;font-size:12px;padding:10px 3px;border-radius:5px 5px 0 0}.nav-item span{width:20px;font-size:15px}main{padding-inline:18px}.topbar{height:49px;font-size:10px}.page-heading{padding:29px 0 24px}h1{font-size:25px;letter-spacing:0}.date-stamp{display:none}.workspace-controls{gap:12px;padding-block:14px}.workspace-controls label{flex:1 1 45%;display:grid;gap:4px}.workspace-controls select{width:100%;font-size:11px;max-width:100%}.stats-grid{padding-block:23px}.stat{padding-left:12px}.stat-label{font-size:10px}.stat-number{font-size:22px}.stat-number small{display:none}.question-card{padding:22px 18px;min-height:0}.question-prompt{font-size:17px;margin:21px 0}.option{padding:12px;font-size:12px}.question-actions{flex-wrap:wrap}.last-correct{align-items:flex-start;padding:13px;font-size:11px}.last-correct button{font-size:10px;padding:7px}.panel{padding:23px 20px}.list-question{padding:15px;gap:10px}.search{font-size:11px}.question-meta{font-size:9px}.draft-header{flex-wrap:wrap}.draft-header input{max-width:100%;width:100%}footer{padding-top:30px}.local-badge{font-size:9px}}
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[hidden]{display:none!important}
.source-note{flex-basis:100%;margin:0 0 8px;color:#9f634b;font-size:12px;line-height:1.8}.last-correct{margin:0 0 16px}
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.bootstrap-loading{position:fixed;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:15px;background:var(--bg);z-index:10;color:var(--muted);font-size:12px}.bootstrap-loading .brand-mark{animation:breathe 1.6s ease-in-out infinite}@keyframes breathe{50%{opacity:.45}}
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.explanation-chat{margin-top:15px}.chat-messages{display:grid;gap:14px}.chat-message{min-width:0}.chat-user{padding:12px 14px;background:#ffffffa6;border:1px solid #decfc4;border-radius:6px;margin-top:5px}.chat-role{display:block;font-size:10px;letter-spacing:1px;color:var(--muted);margin-bottom:5px}.markdown-content{font-size:13px;line-height:1.85;overflow-wrap:anywhere}.markdown-content>:first-child{margin-top:0}.markdown-content>:last-child{margin-bottom:0}.markdown-content h1,.markdown-content h2,.markdown-content h3,.markdown-content h4{font-family:inherit;font-size:14px;line-height:1.7;margin:14px 0 7px;font-weight:600;letter-spacing:0}.markdown-content p{margin:8px 0}.markdown-content ul,.markdown-content ol{padding-left:21px;margin:8px 0}.markdown-content li{margin:3px 0}.markdown-content code{font-size:11px;padding:2px 4px;background:#ffffffa1;border-radius:3px;white-space:pre-wrap}.markdown-content pre{padding:12px;background:#fffaf3;overflow:auto;border-radius:5px;line-height:1.65}.markdown-content pre code{padding:0;background:none;white-space:pre}.markdown-content blockquote{margin:12px 0;padding:3px 13px;border-left:3px solid #b4c2a9;color:#677260}.markdown-content table{display:block;max-width:100%;overflow:auto;border-collapse:collapse;margin:12px 0;font-size:12px}.markdown-content td,.markdown-content th{padding:7px 10px;border:1px solid #d8d9ca;text-align:left}.markdown-content a{color:#3f6545;text-decoration:underline;text-underline-offset:3px}.explanation-form{margin-top:18px;padding-top:14px;border-top:1px solid #dfd6ca}.chat-input-row{display:flex;gap:10px;align-items:flex-end;margin-top:7px}.chat-input-row textarea{resize:vertical;flex:1;min-width:0;min-height:60px;font-size:12px;background:#fffef9;line-height:1.7}.chat-input-row button{flex-shrink:0}.explanation-chat>.feedback-source{display:block;margin-top:13px;font-size:10px}.study-card .option:not(:disabled){cursor:pointer}@media(max-width:680px){.chat-input-row{gap:7px}.chat-input-row button{padding:9px 12px}.markdown-content{font-size:12px}.markdown-content pre{max-width:100%;font-size:11px}}