:root{--green:#245a40;--green2:#347454;--green3:#e5f0e9;--green4:#f4f8f5;--paper:#fffdf7;--orange:#e67d3f;--ink:#29362f;--muted:#78847c;--line:#dce4df;--violet:#6d6087;--violet2:#f0edf5;font-family:"Microsoft YaHei","PingFang SC",sans-serif;color:var(--ink);background:#edf1ee}*{box-sizing:border-box}html,body{margin:0;min-width:1180px;height:100%;overflow:hidden}button,textarea{font:inherit;color:inherit}button{cursor:pointer}.app-shell{height:100vh;display:flex;flex-direction:column}.topbar{height:78px;flex:0 0 78px;background:#fff;border-bottom:1px solid var(--line);display:grid;grid-template-columns:315px 1fr 260px;align-items:center;padding:0 22px;z-index:20}.brand{display:flex;gap:11px;align-items:center}.brand-seal{width:42px;height:46px;display:grid;place-items:center;border:1px solid #9dbba9;background:var(--green4);font:700 22px SimSun;color:var(--green)}.brand small{font-size:10px;letter-spacing:.08em;color:#8a968e}.brand h1{margin:4px 0 0;font-size:18px;color:#183d2b}.brand h1 em{font-style:normal;font-weight:500;color:#66746b}.stage-nav{justify-self:center;display:flex;align-items:center}.stage-nav button{border:0;background:transparent;display:flex;align-items:center;gap:8px;padding:8px 12px}.stage-nav button>b{width:28px;height:28px;display:grid;place-items:center;border:1px solid #bac6be;font:700 10px Georgia;color:#829087}.stage-nav button span,.stage-nav button small{display:block;text-align:left}.stage-nav button span{font-size:12px;font-weight:700}.stage-nav button small{font-size:9px;font-weight:400;color:#8c9890;margin-top:3px}.stage-nav button.is-active>b{background:var(--green);border-color:var(--green);color:#fff}.stage-nav button.is-disabled{opacity:.35;cursor:not-allowed}.stage-nav i{width:30px;height:1px;background:#d4ddd7}.top-actions{justify-self:end;display:flex;align-items:center;gap:9px}.demo-tag{background:#fff0e6;color:var(--orange);border:1px solid #f0c9ad;padding:5px 7px;font-size:10px;font-weight:700}.top-actions button{border:0;background:transparent;color:#65736a;font-size:11px}.research-layout{flex:1;min-height:0;display:grid;grid-template-columns:218px minmax(510px,1fr) 495px}.book-nav{min-height:0;background:#fff;border-right:1px solid var(--line);padding:17px 13px;overflow:hidden}.panel-title small,.guide-heading small{display:block;font:700 9px Georgia;letter-spacing:.16em;color:#9ba69f}.panel-title h2,.guide-heading h2{font-size:16px;margin:4px 0 13px;color:#183d2b}.nav-tabs{display:grid;grid-template-columns:1fr 1fr;padding:3px;background:#edf2ee}.nav-tabs button{border:0;background:transparent;padding:8px;font-size:11px}.nav-tabs button.is-active{background:#fff;color:var(--green);font-weight:700;box-shadow:0 1px 4px #173f2e18}.nav-panel{display:none;height:calc(100% - 79px);overflow:auto;padding-top:12px;scrollbar-width:thin}.nav-panel.is-active{display:block}.lesson-meta{display:flex;align-items:center;gap:9px;padding:4px 5px 13px;border-bottom:1px solid var(--line);margin-bottom:9px}.lesson-meta>span{width:42px;height:36px;display:grid;place-items:center;background:#fff0e6;border:1px solid #f1c9ab;color:var(--orange);font-size:11px;font-weight:700}.lesson-meta b,.lesson-meta small{display:block}.lesson-meta b{font:700 16px SimSun;margin-bottom:4px}.lesson-meta small{font-size:9px;color:#8d9891}.page-card{width:100%;display:grid;grid-template-columns:50px 1fr 10px;gap:9px;align-items:center;border:1px solid transparent;background:transparent;padding:7px;text-align:left}.page-card:hover{background:var(--green4)}.page-card.is-active{background:var(--green4);border-color:#a9c5b3}.mini-page{height:65px;background:#fff;border:1px solid #d6ded9;padding:7px;display:flex;flex-direction:column;gap:6px}.mini-page b{font:700 13px SimSun;color:var(--green)}.mini-page i{height:2px;background:#cfd7d1}.page-card>div b,.page-card>div small{display:block}.page-card>div b{font-size:11px;margin-bottom:4px}.page-card>div small{font-size:9px;color:#8b9690;line-height:1.5}.page-card>em{width:7px;height:7px;border-radius:50%;background:#cbd5ce}.page-card.is-active>em{background:var(--orange);box-shadow:0 0 0 3px #fde8da}.html-note{display:flex;gap:8px;margin:14px 3px;padding:11px;background:var(--paper);border-left:3px solid #d2ad79}.html-note>span{color:var(--green2);font-size:12px}.html-note p{margin:0;font-size:9px;line-height:1.6;color:#7a7c72}.html-note b{display:block;color:#5c604f;margin-bottom:3px}.content-group{border-bottom:1px solid #edf0ee;padding:4px 0}.content-group>button{width:100%;border:0;background:transparent;text-align:left;padding:8px 6px;font-size:11px;font-weight:700}.content-group>button span{float:right;color:#9ca69f}.content-links{display:grid;padding:0 0 6px 17px}.content-links button{border:0;border-left:1px solid #dbe3de;background:transparent;text-align:left;padding:6px 8px;font-size:10px;color:#748078}.content-links button:hover{color:var(--green);background:var(--green4);border-left-color:var(--green2)}.textbook-area{min-width:0;min-height:0;display:flex;flex-direction:column;background:#e5e9e6}.textbook-toolbar{height:47px;flex:0 0 47px;display:flex;align-items:center;justify-content:space-between;padding:0 15px;background:#f8faf8;border-bottom:1px solid #d6ddd8}.textbook-toolbar>div{display:flex;align-items:center;gap:6px}.textbook-toolbar button{border:0;background:transparent;padding:5px 7px;color:#617067}.textbook-toolbar span{font-size:10px;color:#77837b}.textbook-toolbar b{color:var(--green)}.interactive-state{display:flex;align-items:center;gap:6px}.interactive-state i{width:7px;height:7px;border-radius:50%;background:#59a878;box-shadow:0 0 0 3px #dceee3}.document-scroll{position:relative;flex:1;min-height:0;overflow:auto;padding:20px 30px 70px;scrollbar-width:thin;scroll-behavior:smooth}.interaction-tip{position:sticky;top:0;z-index:12;width:max-content;max-width:90%;margin:0 auto 13px;padding:8px 11px;background:#1e4935;color:#dcebe2;box-shadow:0 7px 20px #183c2a24;font-size:9px}.interaction-tip span{color:#ffc38f;font-weight:700;margin-right:7px}.interaction-tip button{border:0;background:transparent;color:#fff;margin-left:8px}.textbook-page{--text-scale:1;width:650px;min-height:980px;margin:0 auto 25px;background:var(--paper);box-shadow:0 12px 32px #213b2c20;padding:34px 54px 24px;position:relative;overflow:hidden}.page-topline{display:flex;justify-content:space-between;align-items:center}.page-topline span{padding:6px 14px;background:#ffe0c7;color:#8a4a22;font:700 14px SimSun;letter-spacing:.35em}.page-topline small{font-size:9px;color:#a19b8e}.lesson-title{width:max-content;margin:12px auto 6px;display:flex;align-items:center;gap:13px;padding:4px 10px}.lesson-title>b{width:42px;height:42px;border:3px solid var(--orange);border-radius:50%;display:grid;place-items:center;color:var(--orange);font:700 25px Georgia}.lesson-title h1{margin:0;font:400 calc(31px * var(--text-scale)) KaiTi,STKaiti,serif;letter-spacing:.28em}.lesson-title sup{font:10px SimSun;letter-spacing:0}.tide-photo{margin:0 -54px 23px;overflow:hidden;position:relative;background:#eee}.tide-photo img{display:block;width:100%;height:auto}.tide-photo.second{margin-top:-34px}.lesson-body{font-size:calc(17px * var(--text-scale));font-family:KaiTi,STKaiti,serif;line-height:2.05}.lesson-body p{margin:0 0 13px;text-indent:2em;text-align:justify}.lesson-body p.lead{text-indent:0;margin-left:2em}.mapped-block{position:relative;border-radius:2px;transition:background .18s,box-shadow .18s;cursor:pointer}.mapped-block:hover{background:#edf6f0;box-shadow:0 0 0 3px #edf6f0}.mapped-block:hover:after{content:"查看对应";position:absolute;right:0;top:-17px;background:var(--green2);color:#fff;padding:3px 6px;font:8px "Microsoft YaHei";letter-spacing:0}.mapped-block.is-source-active{background:#fff0cb;box-shadow:inset 3px 0 var(--orange),0 0 0 4px #fff0cb}[data-anchor].is-precise-active{background:#ffe6a6;box-shadow:inset 0 -2px #e67d3f;border-radius:2px}.mapped-block.is-precise-active{box-shadow:inset 3px 0 #e67d3f,0 0 0 4px #ffe6a6}.mapped-block.is-source-active:after{content:"当前对应";position:absolute;right:0;top:-18px;background:var(--orange);color:#fff;padding:3px 6px;font:8px "Microsoft YaHei"}.word{border-bottom:1px dashed var(--green2);cursor:help}.page-foot{position:absolute;left:54px;right:54px;bottom:20px;display:flex;justify-content:space-between;align-items:end;color:#8f8c82;font-size:9px}.page-foot b{color:#3f4942;font:15px Georgia}.page-three-body{padding-top:3px}.textbook-bubble{width:245px;margin:5px 0 13px auto;padding:16px 18px;background:#fff7ed;border:2px solid #ee935b;border-radius:48%;font-family:KaiTi,STKaiti,serif;color:#765742}.textbook-bubble:before,.textbook-bubble:after{content:"";position:absolute;border:2px solid #ee935b;border-radius:50%;background:#fff7ed}.textbook-bubble:before{width:12px;height:12px;left:-18px;bottom:18px}.textbook-bubble:after{width:6px;height:6px;left:-30px;bottom:9px}.textbook-bubble p{font-size:13px;line-height:1.8;text-indent:0;margin:0}.textbook-bubble button{display:block;margin:6px auto 0;border:0;background:transparent;color:var(--orange);font:8px "Microsoft YaHei"}.character-zone{margin-top:22px;padding-top:12px;border-top:2px solid #54b8e9;font-family:KaiTi,STKaiti,serif}.character-zone>div{display:flex;flex-wrap:wrap;gap:5px;margin-bottom:8px;align-items:center}.character-zone small{width:45px;font:9px "Microsoft YaHei";color:#4ba7d5}.character-zone span{width:29px;height:29px;display:grid;place-items:center;border:1px solid #8bd1ef;background:#fff;font-size:18px}.exercise-page{padding-top:48px}.exercise-list{display:grid;gap:14px}.exercise{display:grid;grid-template-columns:22px 1fr;gap:7px;font:16px/1.8 KaiTi,STKaiti,serif}.exercise>span{color:#df7656}.exercise p{margin:0}.poem{width:420px;margin:24px auto;text-align:center;padding:10px}.poem h2{margin:0 0 6px;font:700 19px KaiTi,STKaiti,serif;letter-spacing:.18em}.poem small{font:12px SimSun;color:#716e67}.poem p{font:17px/2.05 KaiTi,STKaiti,serif}.resource-box{margin-top:23px;padding:35px 25px 22px;border:2px solid #83aee2;background:#eaf3ff;min-height:300px}.resource-label{position:absolute;left:13px;top:-18px;padding:5px 13px;background:#fff;border:2px solid #83aee2;border-radius:16px;color:#397fc1;font-size:15px;font-weight:700}.resource-box p{font:15px/2 KaiTi,STKaiti,serif;text-align:justify;margin:0}.bay-map{float:right;width:250px;height:auto;margin:0 0 12px 18px;border:1px solid #a7cbd0;display:block}.bay-map:before{content:"";position:absolute;left:-20px;bottom:-35px;width:210px;height:110px;background:#f4e9b8;border-radius:50% 60% 0 0;transform:rotate(-10deg)}.bay-map b,.bay-map i,.bay-map em{position:absolute;z-index:1;font-style:normal;font-size:10px}.bay-map b{top:30px;left:100px}.bay-map i{bottom:35px;right:30px;color:#3f8bb4}.bay-map em{bottom:20px;left:85px;color:#76633f}.guide-panel{min-width:0;min-height:0;background:#fff;border-left:1px solid var(--line);display:flex;flex-direction:column}.guide-heading{height:50px;flex:0 0 50px;display:flex;align-items:center;justify-content:space-between;padding:0 14px;border-bottom:1px solid var(--line)}.guide-heading h2{margin-bottom:0}.guide-heading button{border:1px solid #ccd7d0;background:#fff;padding:6px 8px;color:#617067;font-size:9px}.mapping-tabs{height:61px;display:grid;grid-template-columns:1fr 1fr;gap:6px;padding:6px 8px;border-bottom:1px solid var(--line);background:#f8faf8}.mapping-tabs button{border:1px solid transparent;background:transparent;text-align:left;padding:6px 10px}.mapping-tabs b,.mapping-tabs small{display:block}.mapping-tabs b{font-size:11px}.mapping-tabs small{font-size:8px;color:#909b94;margin-top:3px}.mapping-tabs button.is-active{background:#fff;border-color:#a6c4b1;box-shadow:0 1px 5px #14392412}.mapping-tabs button.is-active b{color:var(--green)}.guide-main{flex:1;min-height:0;display:grid;grid-template-columns:180px 1fr}.guide-tree{min-height:0;overflow:auto;padding:8px;background:#fafbfa;border-right:1px solid var(--line);scrollbar-width:thin}.tree-overview{width:100%;border:0;background:var(--green);color:#fff;padding:10px;text-align:left}.tree-overview small,.tree-overview b{display:block}.tree-overview small{font:7px Georgia;letter-spacing:.12em;opacity:.7}.tree-overview b{font-size:11px;margin:4px 0}.tree-overview p{font-size:8px;line-height:1.5;margin:0;opacity:.8}.tree-separator{display:flex;align-items:center;gap:5px;margin:9px 4px 5px;color:#9ba49e;font-size:7px}.tree-separator:after{content:"";flex:1;height:1px;background:#dce3de}.tree-group{margin-bottom:4px}.tree-group>span{display:block;padding:7px 5px 4px;color:#5c6b62;font-size:9px;font-weight:700}.tree-item{width:100%;border:0;border-left:1px solid #dce3de;background:transparent;text-align:left;padding:6px 7px;margin-left:6px;color:#748078;font-size:9px;line-height:1.4}.tree-item.level2{padding-left:15px}.tree-item:hover{background:var(--green4);color:var(--green)}.tree-item.is-active{background:#e5f0e9;color:var(--green);border-left:3px solid var(--green2);font-weight:700}.guide-detail{min-width:0;min-height:0;overflow:auto;padding:14px 15px 30px;scrollbar-width:thin}.breadcrumb{font-size:8px;color:#99a39c;margin-bottom:9px}.detail-title{border-bottom:1px solid #e4e9e6;padding-bottom:10px;margin-bottom:12px}.detail-title small{color:var(--orange);font-size:8px;letter-spacing:.08em}.detail-title h3{margin:5px 0 0;font:700 16px/1.45 SimSun;color:#193e2c}.original-text{border-left:3px solid #b4ccbc;padding-left:11px}.original-text p{margin:0 0 10px;font-size:11px;line-height:1.85;color:#4f5c54;text-align:justify}.detail-tabs{display:grid;grid-template-columns:1fr 1fr;border-bottom:1px solid var(--line);margin-bottom:12px}.detail-tabs button{border:0;border-bottom:2px solid transparent;background:transparent;padding:7px;font-size:9px;color:#7f8a83}.detail-tabs button.is-active{color:var(--green);font-weight:700;border-bottom-color:var(--green2)}.flow-summary{padding:9px 10px;background:var(--green4);border-left:3px solid var(--green2);font-size:9px;line-height:1.6;color:#5d6b62;margin-bottom:11px}.flow-list{display:grid}.flow-step{display:grid;grid-template-columns:22px 1fr;gap:8px;padding-bottom:9px;position:relative}.flow-step-button{width:100%;border:1px solid transparent;background:transparent;text-align:left;padding:5px 4px;cursor:pointer}.flow-step-button:hover{background:#f4f8f5;border-color:#d4e2d8}.flow-step-button.is-flow-active{background:#fff5df;border-color:#e8b77f}.flow-step:not(:last-child):after{content:"";position:absolute;left:10px;top:22px;bottom:0;width:1px;background:#c9d9cf}.flow-step>span{width:21px;height:21px;display:grid;place-items:center;border:1px solid #9ab7a4;background:#fff;color:var(--green);font:700 8px Georgia;z-index:1}.flow-step b{font-size:10px}.flow-step p{font-size:8px;color:#808a84;line-height:1.5;margin:3px 0 0}.source-foot{margin-top:13px;padding-top:9px;border-top:1px dashed #dce3de;display:flex;justify-content:space-between;color:#98a29c;font-size:8px}.source-foot button{border:0;background:transparent;color:var(--green2);font-size:8px}.relation-popover{position:fixed;z-index:80;width:280px;background:#fff;border:1px solid #a9c5b3;border-top:3px solid var(--green2);box-shadow:0 18px 45px #173f2e2b;padding:10px}.relation-popover>div{display:flex;justify-content:space-between;align-items:center;margin-bottom:6px}.relation-popover>div b{font-size:10px}.relation-popover>div button{border:0;background:transparent}.relation-popover section{display:grid;gap:5px}.relation-choice{border:1px solid #dde5df;background:#fff;padding:8px;text-align:left}.relation-choice:hover{background:var(--green4);border-color:#a9c5b3}.relation-choice small,.relation-choice b{display:block}.relation-choice small{font-size:7px;color:var(--orange);margin-bottom:3px}.relation-choice b{font-size:9px}.selection-tools{position:fixed;z-index:90;display:flex;align-items:center;background:#183e2c;color:#fff;box-shadow:0 10px 30px #173f2e35;padding:4px}.selection-tools>span{max-width:125px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:#c8dbcf;font-size:8px;padding:0 7px}.selection-tools button{border:0;border-left:1px solid #476654;background:transparent;color:#fff;padding:7px 8px;font-size:8px}.selection-tools button:hover{background:#315d45}.word-popover{position:fixed;z-index:95;width:230px;background:#fff;border:1px solid #b4cbbc;border-top:3px solid var(--green2);box-shadow:0 15px 38px #173f2e28;padding:11px;pointer-events:none}.word-popover b{font:700 15px SimSun;color:var(--green)}.word-popover p{font-size:10px;line-height:1.65;color:#55635a;margin:6px 0}.word-popover small{font-size:7px;color:#9ba59e}.ai-fab{position:fixed;right:24px;bottom:20px;z-index:60;display:flex;align-items:center;gap:8px;border:1px solid #cec7d9;background:#fff;padding:7px 11px 7px 7px;box-shadow:0 8px 25px #493e6024}.ai-fab>span{width:32px;height:32px;display:grid;place-items:center;background:var(--violet);color:#fff;font:700 9px Georgia}.ai-fab b,.ai-fab small{display:block;text-align:left}.ai-fab b{font-size:9px;color:#50475c}.ai-fab small{font-size:7px;color:#978da4;margin-top:2px}.ai-drawer{position:fixed;right:17px;bottom:17px;z-index:100;width:355px;height:min(600px,calc(100vh - 100px));display:flex;flex-direction:column;background:#fff;border:1px solid #ccc5d7;box-shadow:0 22px 55px #302a3b3b;transform:translateX(calc(100% + 35px));opacity:0;transition:.22s}.ai-drawer.is-open{transform:translateX(0);opacity:1}.ai-drawer>header{height:57px;display:flex;align-items:center;justify-content:space-between;padding:0 13px;background:#50465f;color:#fff}.ai-drawer>header>div{display:flex;align-items:center;gap:8px}.ai-drawer>header>div>span{width:30px;height:30px;display:grid;place-items:center;border:1px solid #81758e;font:700 8px Georgia}.ai-drawer header b,.ai-drawer header small{display:block}.ai-drawer header b{font-size:11px}.ai-drawer header small{font-size:7px;color:#c9c0d3;margin-top:3px}.ai-drawer header button{border:0;background:transparent;color:#fff;font-size:21px}.ai-selection{padding:9px 11px;background:var(--violet2);border-bottom:1px solid #ddd7e5;position:relative}.ai-selection small{font-size:7px;color:var(--violet);font-weight:700}.ai-selection p{font-size:9px;line-height:1.55;color:#5d5368;margin:4px 23px 0 0;max-height:44px;overflow:hidden}.ai-selection button{position:absolute;right:8px;top:16px;border:0;background:transparent;color:#8d8298;font-size:8px}.chat-list{flex:1;min-height:0;overflow:auto;padding:13px;display:flex;flex-direction:column;gap:10px}.chat{display:flex;gap:7px;align-items:flex-start}.chat>span{flex:0 0 24px;height:24px;display:grid;place-items:center;background:var(--violet);color:#fff;font:700 7px Georgia}.chat p{margin:0;max-width:270px;padding:8px 9px;background:#f3f0f6;color:#5b5266;font-size:9px;line-height:1.65}.chat.user{justify-content:flex-end}.chat.user p{background:var(--green);color:#fff}.suggestions{padding:0 11px 7px;display:flex;gap:5px;overflow:hidden}.suggestions button{white-space:nowrap;border:1px solid #d8d2df;background:#fff;color:#756a80;padding:5px 7px;font-size:7px}.ai-drawer form{display:grid;grid-template-columns:1fr 50px;gap:6px;padding:9px 11px;border-top:1px solid #e4dfe8}.ai-drawer textarea{height:48px;resize:none;border:1px solid #d7d1df;padding:7px;font-size:8px}.ai-drawer form button{border:0;background:var(--violet);color:#fff;font-size:8px}.simulation-note{text-align:center;color:#a299a8;font-size:7px;padding-bottom:7px}.modal{position:fixed;inset:0;z-index:120;display:grid;place-items:center;background:#173f2e8c}.modal[hidden]{display:none}.modal>section{position:relative;width:620px;background:#fff;border-top:4px solid var(--green2);padding:30px 36px;box-shadow:0 24px 70px #173f2e4d}.modal-close{position:absolute;right:12px;top:9px;border:0;background:transparent;font-size:22px;color:#89958d}.modal>section>small{color:var(--orange);font-size:8px;font-weight:700}.modal h2{margin:6px 0 17px;font-size:21px}.feature-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.feature-grid p{margin:0;padding:12px;background:#f6f9f7;color:#77827b;font-size:9px;line-height:1.6}.feature-grid b{display:block;color:#405249;margin-bottom:4px}.source-modal>section{width:min(950px,88vw);height:min(720px,86vh);padding:0;border-top:0}.source-modal section>header{height:60px;display:flex;align-items:center;justify-content:space-between;padding:0 18px;border-bottom:1px solid var(--line)}.source-modal header small{color:var(--green2);font-size:8px}.source-modal header h2{margin:3px 0 0;font-size:14px}.source-body{height:calc(100% - 60px);display:grid;grid-template-columns:135px 1fr}.source-body nav{overflow:auto;padding:10px;background:#f0f3f1}.source-body nav button{width:100%;border:2px solid transparent;background:#fff;padding:3px;margin-bottom:7px}.source-body nav button.is-active{border-color:var(--green2)}.source-body nav img{display:block;width:100%}.source-body>div{overflow:auto;background:#e5e9e6;padding:18px;text-align:center}.source-body>div>img{width:650px;height:auto;box-shadow:0 8px 24px #173f2e2b}.toast{position:fixed;z-index:160;left:50%;bottom:25px;transform:translate(-50%,15px);background:#193e2c;color:#fff;padding:8px 13px;font-size:9px;opacity:0;transition:.18s;pointer-events:none}.toast.is-visible{opacity:1;transform:translate(-50%,0)}@media(max-width:1360px){.topbar{grid-template-columns:275px 1fr 220px}.stage-nav i{width:15px}.stage-nav button{padding:7px}.research-layout{grid-template-columns:200px minmax(480px,1fr) 450px}.guide-main{grid-template-columns:165px 1fr}.textbook-page{width:590px;min-height:900px;padding-left:48px;padding-right:48px}.tide-photo{margin-left:-48px;margin-right:-48px}.lesson-body{font-size:calc(15.5px * var(--text-scale))}.tide-photo img{top:-87px}}