:root{--paper:#f7f7f2;--ink:#25392f;--green:#466354;--muted:#59665d;--line:#dde1d7}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;display:flex;flex-direction:column;height:100vh;height:100dvh}button,input,select{font:inherit}a{color:inherit;text-decoration:none}button{padding:9px 13px;font-size:12px;border:1px solid var(--line);border-radius:6px;background:#fdfdf9;color:var(--ink);cursor:pointer}button:hover{background:#eaf0e5}button:disabled{opacity:.5;cursor:wait}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:2px solid var(--green);outline-offset:3px}.reader-header{display:flex;align-items:center;gap:24px;padding:15px 24px;border-bottom:1px solid var(--line);flex-shrink:0}.back{font-size:12px;color:var(--muted)}.reader-title{display:flex;align-items:center;gap:14px;flex:1}.reader-title strong{font-size:20px;font-weight:500;font-family:"Songti SC","SimSun",serif;letter-spacing:2px}.reader-title span{font-size:11px;color:var(--muted)}#downloadBook{padding:9px 13px;border:1px solid var(--green);border-radius:6px;background:var(--green);color:white;font-size:12px;cursor:pointer}#downloadBook[aria-disabled=true]{opacity:.5;cursor:wait}.reader-controls{display:flex;gap:15px;align-items:center;flex-wrap:wrap;padding:12px 24px;border-bottom:1px solid var(--line);flex-shrink:0}.reader-controls label{display:flex;align-items:center;gap:8px;font-size:11px;color:var(--muted)}select,input{background:white;border:1px solid var(--line);color:var(--ink);padding:8px 10px;border-radius:5px;font-size:12px}select{max-width:225px}#pageForm{display:flex;gap:7px;align-items:center}#printedPage{width:78px}#pageForm button{padding:8px 10px}.reading-status{display:flex;justify-content:space-between;gap:15px;padding:8px 24px;font-size:11px;color:var(--muted);flex-shrink:0}.reading-status small{font-size:10px}.reader-main{position:relative;flex:1;min-height:0;background:#dfe3df}iframe{width:100%;height:100%;border:0;display:block}.loading-overlay{position:absolute;inset:0;display:grid;place-items:center;background:var(--paper);z-index:5;padding:25px}.loading-card{width:min(430px,100%);text-align:center;border:1px solid var(--line);border-radius:15px;padding:40px 30px;background:#fdfdf9}.loading-mark{font-family:"Songti SC","SimSun",serif;font-size:65px;color:#a9945b}.loading-card h1{font-family:"Songti SC","SimSun",serif;font-size:24px;font-weight:500;margin:23px 0 15px}.loading-card p{font-size:13px;line-height:1.9;color:var(--muted);margin:0 0 20px}.loading-card small{font-size:11px;color:var(--muted);line-height:1.9;display:block;margin-top:17px}.loading-card progress{width:100%;height:6px;accent-color:var(--green)}#retryButton{margin-top:20px}[hidden]{display:none!important}@media(max-width:780px){.topic-select{display:none}.reader-controls{gap:10px;padding:10px 16px}.reader-header{padding:12px 16px;gap:15px}.reading-status{padding:8px 16px}.reading-status small{display:none}.reader-title span{display:none}.reader-title strong{font-size:18px}.reader-controls select{max-width:180px}}@media(max-width:480px){.reader-controls{gap:9px}.reader-controls label{font-size:10px}.reader-controls select{max-width:160px}.reader-title strong{font-size:16px}.back{font-size:11px}#downloadBook{font-size:11px;padding:8px 10px}#bookmarkButton,#gotoBookmark{font-size:11px;padding:8px 10px}#pageForm label{font-size:10px}#printedPage{width:69px}.loading-card{padding:28px 20px}}

.reader-title{min-width:0}.reader-header .back,#downloadBook,.outline-toggle{flex-shrink:0}.outline-toggle{white-space:nowrap;min-height:34px}.outline-toggle[aria-expanded=true]{border-color:var(--green);background:#eaf0e5}.outline-toggle:disabled{cursor:default}@media(max-width:480px){.reader-header{gap:8px;padding:12px 14px}.reader-title{gap:8px}.reader-title strong{font-size:15px;letter-spacing:1px}.outline-toggle{font-size:11px;padding:8px 9px}#downloadBook{padding:8px 9px}}

.reader-main{display:flex}.reader-main>iframe{flex:1;min-width:0;width:0}.study-sidebar{display:flex;flex-direction:column;flex:0 0 330px;width:330px;min-height:0;height:100%;background:var(--paper);border-right:1px solid var(--line)}.sidebar-heading{display:flex;align-items:center;gap:8px;padding:12px 12px 8px}.sidebar-tabs{display:flex;flex:1;gap:4px}.sidebar-tabs button{flex:1;border-color:transparent;background:transparent;font-size:13px;padding:10px 6px}.sidebar-tabs button[aria-selected=true]{background:#eaf0e5;border-color:var(--green);font-weight:600}#sidebarClose{font-size:22px;padding:2px 9px;line-height:1.4;min-width:34px}.sidebar-search{display:grid;gap:5px;padding:4px 14px 10px;font-size:11px;color:var(--muted)}.sidebar-search input{width:100%;min-width:0}.sidebar-progress{display:grid;gap:5px;padding:0 14px 10px;font-size:11px;color:var(--muted)}.sidebar-progress progress{width:100%;height:5px;accent-color:var(--green)}.sidebar-progress small{font-size:10px}.sidebar-results{padding:0 14px 8px;font-size:10px;color:var(--muted)}.study-panel{flex:1;min-height:0;overflow:auto;overscroll-behavior:contain;padding:0 12px 16px}.study-topic{border:1px solid var(--line);border-radius:8px;margin-bottom:8px;background:#fdfdf9}.study-topic.is-current{border-color:var(--green)}.study-topic>summary{cursor:pointer;padding:12px;font-size:12px;line-height:1.65}.study-topic>summary strong{font-weight:500}.study-topic>summary small{float:right;font-size:10px;color:var(--muted);margin-left:7px}.study-code{font-size:10px;color:var(--green);margin-right:8px}.study-topic-body{padding:0 12px 12px;font-size:12px;line-height:1.75}.study-hours{font-size:11px;color:var(--muted);margin:0 0 8px}.study-targets{display:grid;gap:5px}.sidebar-jump{text-align:left;width:100%;padding:8px;font-size:11px;border-color:#ccd8ca}.sidebar-jump small{display:block;font-size:10px;margin-top:3px;line-height:1.5;color:var(--muted)}.study-topic-body h3{font-size:12px;font-weight:600;margin:14px 0 8px}.reader-goal{display:flex;align-items:flex-start;gap:8px;margin:9px 0}.reader-goal input{flex-shrink:0;margin-top:4px;width:16px;height:16px;padding:0;accent-color:var(--green)}.reader-goal input:checked+span{color:var(--muted)}.study-more{margin-top:14px;border-top:1px solid var(--line);padding-top:9px}.study-more>summary{font-size:11px;color:var(--green);cursor:pointer}.study-more h4{font-size:11px;margin:12px 0 5px}.study-more ol{padding-left:20px}.study-more pre{white-space:pre-wrap;overflow-wrap:anywhere;font:inherit;font-size:11px;line-height:1.8}.toc-entry{display:block;text-align:left;width:100%;border:0;border-bottom:1px solid var(--line);border-radius:0;background:transparent;padding:9px 10px;font-size:12px;line-height:1.6}.toc-entry small{display:block;font-size:10px;color:var(--muted)}.toc-level-0{font-weight:600;background:#eff3ed}.toc-level-1{padding-left:20px}.toc-level-2{padding-left:30px}.toc-level-3{padding-left:40px}.toc-entry[aria-current=page]{border-left:3px solid var(--green);background:#eaf0e5}.sidebar-empty,.sidebar-notice{font-size:11px;line-height:1.7;padding:0 14px;color:var(--muted)}.sidebar-notice:empty{display:none}.sidebar-backdrop{display:none}@media(max-width:760px){.study-sidebar{position:absolute;inset:0 auto 0 0;z-index:4;width:min(340px,calc(100% - 40px));box-shadow:5px 0 20px #25392f33}.sidebar-backdrop{display:block;position:absolute;inset:0;z-index:3;border:0;border-radius:0;background:#25392f33}.sidebar-backdrop:hover{background:#25392f33}}

.sidebar-handle{position:absolute;left:0;top:70px;z-index:6;writing-mode:vertical-rl;letter-spacing:3px;padding:12px 7px;min-height:66px;border-radius:0 7px 7px 0;border-left:0;background:var(--paper);box-shadow:2px 2px 6px #25392f1a}.sidebar-open .sidebar-handle{left:330px}.toc-actions{display:flex;gap:8px;padding:0 0 10px}.toc-actions button{flex:1;padding:7px;font-size:11px}.toc-branch>summary{display:flex;align-items:flex-start;cursor:pointer;list-style:none;border-bottom:1px solid var(--line)}.toc-branch>summary::-webkit-details-marker{display:none}.toc-branch>summary:before{content:'▸';flex-shrink:0;width:18px;padding-top:11px;text-align:center;color:var(--green);font-size:12px}.toc-branch[open]>summary:before{content:'▾'}.toc-branch>summary>.toc-entry{flex:1;min-width:0;border-bottom:0}.toc-children{margin-left:14px;border-left:1px solid var(--line);padding-left:3px}.toc-entry{overflow-wrap:anywhere}.toc-branch>summary:focus-visible{outline:2px solid var(--green);outline-offset:-2px}@media(max-width:760px){.sidebar-open .sidebar-handle{left:min(340px,calc(100% - 40px))}.sidebar-handle{padding:12px 7px;font-size:11px}}