:root{--bg:#f4f5ef;--paper:#fff;--ink:#1e302d;--muted:#6a7771;--green:#194f47;--line:#dce3d9;--lime:#dbeab3;--soft:#eaf1e9;--warn:#895d21;--warnbg:#fff4dc;--bad:#ad4545;--badbg:#fff0ed;--goodbg:#e9f4e9;--r:18px;--reader:17px;--shadow:0 16px 50px #163f3010}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:ui-sans-serif,-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;line-height:1.65;-webkit-tap-highlight-color:transparent}button,input,select,textarea{font:inherit}button,a,input,select,textarea{touch-action:manipulation}button{color:inherit;cursor:pointer}button:disabled{cursor:default;opacity:.4}button,a{transition:background .15s,color .15s,border .15s}button{border:0;background:none}a{color:var(--green);text-decoration:none}a:hover{text-decoration:underline}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #8faf4c;outline-offset:3px}h1,h2,h3,p{margin-top:0}h1{font-size:32px;line-height:1.3;letter-spacing:-.04em;margin-bottom:12px}h2{font-size:23px;line-height:1.4;letter-spacing:-.025em}h3{font-size:18px;line-height:1.5;margin-bottom:8px}p{margin-bottom:14px}.muted{color:var(--muted)}.small{font-size:13px}.mono{font-family:ui-monospace,SFMono-Regular,monospace;letter-spacing:.02em}.eyebrow{font-size:11px;letter-spacing:.14em;font-weight:750;color:var(--muted);text-transform:uppercase}.icon{width:21px;height:21px;display:inline-block;vertical-align:middle;flex-shrink:0;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}.shell{display:grid;grid-template-columns:158px minmax(0,1fr);min-height:100dvh}.sidebar{position:sticky;top:0;height:100dvh;border-right:1px solid var(--line);padding:30px 16px 20px;background:var(--bg);display:flex;flex-direction:column;z-index:20}.brand{display:flex;align-items:center;gap:10px;padding:0 6px;margin-bottom:38px}.brandmark{font-size:21px;line-height:1.3;font-weight:850;letter-spacing:-.1em;color:var(--green);border:1.5px solid var(--green);border-radius:11px;padding:7px 8px 7px 6px}.brandlabel{font-size:13px;font-weight:700;line-height:1.5}.nav{display:grid;gap:8px}.nav button{display:flex;align-items:center;gap:12px;text-align:left;padding:12px;border-radius:12px;font-size:14px;font-weight:600}.nav button.active{background:var(--green);color:#fff}.nav button:not(.active):hover{background:var(--soft)}.sidebottom{margin-top:auto;padding:18px 8px 0}.sidebottom button{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--muted);padding:10px 0}.sideline{width:28px;height:3px;background:#aec483;margin-bottom:10px}.workspace{min-width:0}.topbar{height:78px;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:0 36px;border-bottom:1px solid var(--line);background:var(--bg);position:sticky;top:0;z-index:15}.breadcrumb{font-size:13px;white-space:nowrap;display:flex;gap:12px;align-items:center}.breadcrumb span{color:var(--muted)}.toptools{display:flex;align-items:center;gap:8px}.search-trigger{display:flex;align-items:center;gap:9px;border:1px solid var(--line);background:var(--paper);border-radius:10px;color:var(--muted);padding:8px 12px;font-size:13px}.search-trigger .icon{width:17px}.iconbtn{width:38px;height:38px;display:grid;place-items:center;border:1px solid var(--line);border-radius:10px;background:var(--paper)}.iconbtn:hover{background:var(--soft)}.online-dot{width:6px;height:6px;border-radius:99px;background:#6a8f40;display:inline-block;margin-right:6px}.main{padding:32px 36px 60px;max-width:1640px;margin:0 auto}.pagehead{display:flex;gap:18px;align-items:flex-start;justify-content:space-between;margin-bottom:24px}.pagehead h1{font-size:29px}.pagehead p{color:var(--muted);font-size:14px;margin:7px 0 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var(--line);border-radius:8px;padding:6px;background:var(--paper);color:var(--ink)}.bottomnav{display:none}.modal{position:fixed;inset:0;background:#132b26a8;backdrop-filter:blur(5px);z-index:100;display:flex;align-items:flex-start;justify-content:center;padding:8dvh 20px 30px;overflow:auto}.modal[hidden]{display:none}.modalbox{width:min(720px,100%);background:var(--bg);border:1px solid var(--line);border-radius:20px;padding:24px;box-shadow:0 30px 100px #0003}.modalhead{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:20px}.modalhead h2{margin:0;font-size:20px}.searchinput{width:100%;border:1px solid var(--line);border-radius:12px;padding:14px 18px;background:var(--paper);color:var(--ink);font-size:17px;outline-color:var(--green)}.search-results{margin-top:20px;max-height:60dvh;overflow:auto}.search-result{display:block;width:100%;text-align:left;padding:14px 0;border-bottom:1px solid var(--line)}.search-result strong{font-size:15px;display:block;margin:4px 0}.search-result p{font-size:12px;color:var(--muted);margin:0}.zoom-modal{padding:14px;align-items:stretch;background:#12201ef5;backdrop-filter:none}.zoom-shell{display:flex;flex-direction:column;width:100%;min-width:0;color:white}.zoom-toolbar{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;padding-bottom:12px}.zoom-toolbar .btn{background:#ffffff12;color:white;border-color:#ffffff40;min-height:40px}.zoom-viewport{flex:1;overflow:auto;background:#e5e7e2;border-radius:10px;min-height:0;touch-action:pan-x pan-y pinch-zoom;text-align:center}.zoom-viewport img{display:block;margin:auto;max-width:none;height:auto;object-fit:contain;cursor:zoom-in}.zoom-toolbar a{color:#cde3ac}.toast{position:fixed;z-index:150;bottom:28px;left:50%;transform:translateX(-50%);background:var(--ink);color:#fff;padding:12px 22px;border-radius:12px;font-size:13px;max-width:90vw;box-shadow:0 8px 35px #0002}.toast[hidden]{display:none}.boot{padding:40px}.printonly{display:none}body.night{--bg:#172522;--paper:#1e302b;--ink:#e1eadb;--muted:#a2b49f;--green:#b9d69a;--line:#3d5043;--lime:#445b33;--soft:#293d30;--warn:#e7c88e;--warnbg:#443921;--bad:#f19c93;--badbg:#4e302c;--goodbg:#2b442d}body.night .hero,body.night .nav button.active,body.night .btn.primary,body.night .chip.active{background:#315f4e;color:#fff}body.night .brandmark{color:#d8e9c7}body.night .segmented{background:#263b30}body.night .essay-thumb{background:#304032}body.night .option.selected .option-letter,body.night .check.done{background:#587441;color:white}body.night .zoom-shell{color:white}
@media(min-width:1450px){.study-layout{grid-template-columns:275px minmax(0,1fr)}.reader{padding:32px 40px}.essay-thumb{height:180px}}
@media(max-width:1180px){.shell{grid-template-columns:132px minmax(0,1fr)}.sidebar{padding:25px 10px 18px}.brand{gap:6px;padding:0 3px}.brandlabel{font-size:11px}.brandmark{font-size:17px}.nav button{padding:11px 10px;font-size:12px;gap:8px}.topbar{padding:0 25px}.main{padding:25px 25px 50px}.homegrid{grid-template-columns:minmax(0,1.2fr) minmax(260px,1fr);gap:16px}.hero{padding:25px 28px;gap:15px}.hero h1{font-size:30px}.hero-right{padding-left:10px}.hero-item{gap:6px}.hero-item b{font-size:12px}.study-layout{grid-template-columns:210px minmax(0,1fr);gap:18px}.reader.panel{padding:24px}.quiz-layout{grid-template-columns:minmax(0,1fr) 170px;gap:17px}.essay-layout{gap:17px}.essay-answer{padding:18px}.question{padding:23px}.stats{gap:9px}.stat{padding:12px;gap:7px}.sourcegallery{grid-template-columns:repeat(3,1fr)}}
@media(max-width:900px){.breadcrumb span{display:none}.search-trigger span{display:none}.search-trigger{padding:9px}.homegrid,.quiz-setup{grid-template-columns:1fr}.homegrid>aside{display:grid;grid-template-columns:1fr 1fr;gap:14px}.homegrid>aside>.panel:first-child{grid-column:1/-1}.hero{grid-template-columns:1.1fr 1fr;padding:25px}.hero h1{font-size:28px}.hero-item small{display:none}.study-layout{grid-template-columns:180px minmax(0,1fr)}.study-index button{padding:10px 8px;font-size:12px}.reader h1{font-size:26px}.quiz-layout{grid-template-columns:1fr}.quiz-aside{position:static}.quiz-aside .panel{display:none}.essay-layout{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}.pagehead h1{font-size:25px}.sourcegallery img{height:160px}.book-layout{grid-template-columns:160px minmax(0,1fr)}.reader.panel{padding:21px}.materials-grid{grid-template-columns:1fr}}
@media(max-width:680px){.shell{display:block}.sidebar{display:none}.topbar{height:62px;padding:0 18px;gap:6px}.breadcrumb{font-size:12px;gap:6px}.breadcrumb strong{font-size:13px}.toptools{gap:5px}.toptools>.small{display:none}.iconbtn{width:34px;height:34px}.search-trigger{padding:7px}.main{padding:22px 17px calc(92px + env(safe-area-inset-bottom));width:100%}.pagehead{margin-bottom:20px;gap:10px}.pagehead h1{font-size:25px;margin-bottom:8px}.pagehead p{font-size:13px}.pagehead>.btn{font-size:11px;padding:7px 10px;min-height:36px}.hero{padding:24px;display:block;border-radius:18px}.hero h1{font-size:30px;margin:13px 0 11px}.hero p{font-size:13px;line-height:1.9}.hero-right{margin-top:20px;padding:12px 0 0;border-left:0;border-top:1px solid #ffffff24;display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.hero-item{display:block;padding:0}.hero-item .hero-num{font-size:16px;display:block}.hero-item b{font-size:11px;display:block;line-height:1.6}.hero-item .icon{display:none}.stats{grid-template-columns:repeat(2,1fr);gap:8px;margin:12px 0 22px}.stat{padding:10px 14px}.stat b{font-size:20px}.stat span{font-size:11px}.homegrid>aside{display:block}.homegrid>aside>.panel{margin-bottom:16px}.panel{padding:20px;border-radius:14px}.sectiontitle{margin-top:24px}.sectiontitle h2{font-size:18px}.segmented{width:100%;justify-content:space-between}.segmented button{padding:7px 8px;font-size:11px}.route-item{gap:9px;padding:13px 0}.route-title{font-size:13px}.check{width:24px;height:24px}.route-item>.small{font-size:11px}.bottomnav{display:grid;grid-template-columns:repeat(5,1fr);position:fixed;bottom:0;left:0;right:0;z-index:30;border-top:1px solid var(--line);background:var(--paper);padding:7px 7px calc(7px + env(safe-area-inset-bottom));box-shadow:0 -4px 30px #1a3d2010}.bottomnav button{display:grid;justify-items:center;gap:3px;font-size:10px;padding:5px 3px;color:var(--muted);border-radius:9px}.bottomnav button.active{background:var(--soft);color:var(--green);font-weight:700}.bottomnav .icon{width:21px;height:21px}.study-layout{display:block}.study-index{display:none}.mobile-picker{display:block}.toolbar{gap:10px}.filterrow{gap:5px}.chip{padding:6px 9px;font-size:11px}.reader.panel{padding:21px}.reader h1{font-size:26px;line-height:1.5;margin-bottom:17px}.keybox{padding:15px 17px;font-size:var(--reader);margin:17px 0 22px}.study-section p{line-height:2}.reader-footer>.btn{padding:9px 12px;font-size:12px}.essay-catalog{grid-template-columns:1fr;gap:14px}.essay-card{display:grid;grid-template-columns:106px minmax(0,1fr)}.essay-thumb{height:100%;min-height:165px;border:0;border-right:1px solid var(--line);padding:10px}.essay-desc{padding:17px 15px}.essay-desc h3{font-size:16px}.essay-desc p{font-size:12px}.essay-layout{display:block}.diagram-column{position:static;margin-bottom:22px}.diagram-stage img{max-height:44dvh}.prompt{font-size:13px;padding:15px}.draft{min-height:240px}.essay-answer{padding:21px}.question{padding:21px 17px}.question h2{font-size:19px;line-height:1.9;margin:18px 0}.question-image{height:230px}.option{padding:12px 13px;font-size:15px;gap:11px}.quiz-footer .btn{font-size:12px;padding:10px 12px}.quiztype button{padding:14px 11px}.quiztype button.active{padding:13px 10px}.quiztype b{font-size:16px}.result-grid{gap:9px}.result-grid div{padding:15px 8px;font-size:12px}.result-grid b{font-size:25px}.sourcegallery{grid-template-columns:repeat(2,1fr);gap:10px}.sourcegallery img{height:180px}.book-layout{display:block}.booktext{line-height:2}.modal{padding:15px 12px;align-items:flex-start}.modalbox{padding:20px;border-radius:15px}.zoom-modal{padding:8px;align-items:stretch}.toast{bottom:calc(90px + env(safe-area-inset-bottom));width:max-content;max-width:90%;text-align:center}.book-pagebar{gap:7px}.book-pagebar .btn{font-size:12px;padding:8px 11px}.source-line{font-size:11px}.reader-footer .row{width:100%;justify-content:space-between}.notice{font-size:12px;padding:12px 14px}}
@media(max-width:360px){.topbar{padding:0 12px}.main{padding-left:12px;padding-right:12px}.hero{padding:21px}.hero h1{font-size:28px}.option{font-size:14px}.quiztype{gap:6px}.essay-card{grid-template-columns:88px minmax(0,1fr)}}
@media print{body{background:white;color:#000}.sidebar,.topbar,.bottomnav,.toolbar,.study-index,.reader-footer,.mobile-picker,.diagram-column,.draft,.draft-label,.answer-toggle,.rubric,.btn,.quiz-aside{display:none!important}.shell,.study-layout,.essay-layout,.book-layout{display:block}.main{padding:0;max-width:none}.panel,.essay-answer{border:0;padding:0}.reader,.essay-answer{font-size:12pt}.reader h1{font-size:22pt}.study-section,.essay-answer section{break-inside:avoid}.keybox{border:1px solid #aaa;background:white}.essay-answer[hidden]{display:block}.pagehead{margin:0}.printonly{display:block}}
.table-scroll{overflow-x:auto;max-width:100%;border:1px solid var(--line);border-radius:10px}.point-table{border-collapse:collapse;width:100%;min-width:575px;font-size:13px;text-align:left;line-height:1.8}.point-table th{background:var(--soft);color:var(--green);font-weight:700;font-size:12px}.point-table th,.point-table td{padding:11px 13px;border-bottom:1px solid var(--line);vertical-align:top}.point-table tr:last-child td{border:0}.point-table td:nth-child(3){white-space:nowrap}.point-select{padding:8px 11px;border:1px solid var(--line);border-radius:8px;background:var(--paper);color:var(--ink);min-width:95px}.point-totals{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:20px 0}.point-totals>div{border:1px solid var(--line);border-radius:10px;padding:12px 18px;display:flex;justify-content:space-between;background:var(--soft);font-size:14px}.point-totals b{font-size:20px}.lab-correct{background:var(--goodbg)}.lab-wrong{background:var(--badbg)}
@media(max-width:680px){.point-lab .table-scroll{border:0;overflow:visible}.point-lab .point-table{display:block;min-width:0}.point-lab .point-table thead{display:none}.point-lab .point-table tbody{display:block}.point-lab .point-table tr{display:grid;grid-template-columns:minmax(0,1fr) 110px;gap:6px 10px;padding:16px;border:1px solid var(--line);border-radius:12px;margin-bottom:10px}.point-lab .point-table td{padding:0;border:0}.point-lab .point-table td:first-child{color:var(--muted);font-size:12px;grid-column:1}.point-lab .point-table td:nth-child(2){grid-column:1;grid-row:2;font-size:15px}.point-lab .point-table td:nth-child(3){grid-column:2;grid-row:1/3;align-self:center}.point-lab .point-table td:nth-child(4){grid-column:1/-1;font-size:12px;color:var(--muted)}.point-lab .point-table td:nth-child(5){grid-column:1/-1;font-size:12px;font-weight:bold}.point-select{font-size:15px;min-height:44px}.point-totals{gap:7px}.point-totals>div{padding:10px;display:block;text-align:center;font-size:12px}.point-totals b{display:block;font-size:21px}}
.pagehead>.btn{flex-shrink:0;white-space:nowrap}.thumbstrip{overflow-y:hidden;padding-bottom:3px}
@media(max-width:680px){.pagehead{display:block}.pagehead>.btn{margin-top:12px}.pagehead>div{width:100%}.pagehead>.pill{margin-top:10px}}