:root{--navy:#102e4e;--blue:#195a91;--cyan:#28a1b4;--ink:#183148;--muted:#64788c;--line:#dde6ee;--bg:#f3f6fa;--white:#fff;--radius:15px}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;font-size:14px;line-height:1.65}button,input,select,textarea{font:inherit}button,a,input,select,textarea{outline-offset:4px}button{cursor:pointer;border:1px solid var(--line);border-radius:8px;background:white;color:var(--ink);padding:8px 15px;font-weight:550}button:hover{border-color:#5591b8;background:#f3f8fc}button:disabled{opacity:.5;cursor:not-allowed}.primary{background:var(--blue);color:white;border-color:var(--blue)}.primary:hover{background:#124675;color:white}.quiet{font-size:12px;padding:6px 11px}.danger{color:#a13434}.sidebar{position:fixed;inset:0 auto 0 0;width:238px;background:var(--navy);color:#fff;padding:28px 21px;display:flex;flex-direction:column;z-index:5}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:inherit;font-size:23px;font-weight:650;letter-spacing:1px}.brand img{width:48px;height:40px;object-fit:contain;border-radius:6px}.brand small{display:block;font-size:12px;letter-spacing:1px;font-weight:400;color:#b7ccdf}.workspace-label{font-size:11px;letter-spacing:2px;color:#99b6d0;margin:35px 10px 14px}nav{display:grid;gap:7px}nav a{color:#b9cddd;text-decoration:none;display:flex;align-items:center;gap:13px;padding:11px 14px;border-radius:9px;transition:.15s}nav a:hover{background:#ffffff0d;color:white}nav a.active{background:#244c70;color:white}nav svg{width:19px;height:19px;stroke:currentColor;fill:none;stroke-width:1.6}.side-note{margin-top:auto;padding:20px 10px 16px;font-size:12px;color:#c4dae8}.side-note small{display:block;font-size:11px;color:#90adc5;margin-top:6px}.dot{display:inline-block;width:6px;height:6px;background:#5ccabc;border-radius:100%;margin-right:6px}.website{display:flex;align-items:center;justify-content:space-between;gap:7px;border-top:1px solid #ffffff20;padding:18px 0 0;color:white;text-decoration:none;font-size:12px}.website small{display:block;font-size:10px;color:#9db8cc}.website img{height:63px;width:63px;background:white;padding:3px;border-radius:5px}.shell{margin-left:238px;min-height:100vh}.topbar{min-height:72px;background:#ffffffc9;border-bottom:1px solid var(--line);padding:17px 36px;display:flex;gap:12px;align-items:center;justify-content:space-between}.top-actions{display:flex;align-items:center;gap:9px}.status{font-size:11px;color:var(--muted);padding-right:9px}main{max-width:1350px;margin:auto;padding:30px 36px 40px}.bottom{padding:15px 36px 23px;color:var(--muted);font-size:11px;display:flex;justify-content:space-between;gap:15px}.hero{position:relative;background:linear-gradient(110deg,#10385f,#195b7a);color:white;border-radius:18px;padding:31px 36px;min-height:205px;overflow:hidden;margin-bottom:25px}.eyebrow{font-size:11px;letter-spacing:2px;color:#a9d7e8;margin-bottom:7px}.hero h1{font-size:30px;line-height:1.35;margin:0 0 12px;font-weight:600;letter-spacing:.5px}.hero p{max-width:70%;color:#d3e5ee;margin:0 0 17px;font-size:13px}.hero button{border-color:#ffffff50;background:#ffffff16;color:white}.mascot{position:absolute;right:38px;top:10px;width:147px;height:156px;overflow:hidden;filter:drop-shadow(0 8px 12px #001b3055)}.mascot img{position:absolute;width:441px;max-width:none;top:0;left:0}.cards{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:17px;margin-bottom:25px}.metric,.panel,.course-card,.teacher-card{background:white;border:1px solid var(--line);border-radius:var(--radius)}.metric{padding:19px 22px}.metric .label{font-size:12px;color:var(--muted)}.metric .number{font-size:29px;font-weight:650;margin:5px 0;color:var(--navy)}.metric small{font-size:11px;color:var(--muted)}.grid2{display:grid;grid-template-columns:1fr 1fr;gap:22px}.panel{padding:24px;margin-bottom:21px}.panel h2{font-size:17px;margin:0 0 15px}.panel p{color:var(--muted)}.step{display:flex;gap:14px;border-bottom:1px solid #edf1f5;padding:15px 0}.step:last-child{border:0}.step .index{background:#eaf4fa;width:29px;height:29px;text-align:center;border-radius:8px;color:var(--blue);font-size:12px;line-height:29px;flex-shrink:0}.step strong{display:block;font-size:14px}.step small{color:var(--muted);font-size:12px}.head{display:flex;justify-content:space-between;align-items:flex-start;gap:20px;margin-bottom:22px}.head h1{margin:0;font-size:25px;font-weight:650}.head p{margin:7px 0 0;color:var(--muted);font-size:13px}.pill{display:inline-flex;border-radius:5px;background:#eaf3fa;color:#27628b;padding:3px 8px;font-size:11px;white-space:nowrap}.pill.green{background:#e8f5ef;color:#23745c}.pill.amber{background:#fff3df;color:#986c25}.toolbar{display:flex;gap:12px;align-items:center;margin-bottom:22px;flex-wrap:wrap}.toolbar input{flex:1;min-width:160px;max-width:400px}.library{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.course-card,.teacher-card{padding:22px;display:flex;flex-direction:column}.course-card h2,.teacher-card h2{font-size:18px;margin:13px 0 8px;line-height:1.5}.course-card p,.teacher-card p{font-size:12px;color:var(--muted);margin:5px 0}.card-foot{margin-top:auto;padding-top:20px;display:flex;justify-content:space-between;align-items:center;gap:10px}.card-foot button{padding:6px 11px;font-size:12px}.avatar{width:42px;height:42px;border-radius:12px;background:#eaf3fa;color:var(--blue);font-weight:650;font-size:20px;display:grid;place-items:center}.muted{color:var(--muted);font-size:12px}.empty{padding:45px;text-align:center;color:var(--muted);background:white;border:1px dashed #c8d7e4;border-radius:14px;grid-column:1/-1}.empty h2{font-size:18px;color:var(--ink)}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.field{display:flex;flex-direction:column;gap:6px}.field.full{grid-column:1/-1}label{font-size:12px;color:#435e75}input,select,textarea{width:100%;padding:10px 12px;border:1px solid #d2dfe9;border-radius:7px;background:white;color:var(--ink);min-width:0}textarea{resize:vertical;min-height:100px;line-height:1.7}input:focus,select:focus,textarea:focus{border-color:#3f8dba;outline:2px solid #3f8dba22}.actions{display:flex;gap:9px;flex-wrap:wrap;align-items:center;margin-top:20px}.hint{font-size:12px;color:var(--muted);background:#f4f8fb;padding:11px 14px;border-radius:8px;margin-bottom:18px}.output{font-size:13px;min-height:470px;font-family:inherit}.split{display:grid;grid-template-columns:minmax(300px,.9fr) minmax(350px,1.25fr);gap:22px;align-items:start}.check-list{display:grid;gap:10px;margin:13px 0}.check-list label{display:flex;align-items:flex-start;gap:9px;font-size:13px}.check-list input{width:16px;height:16px;margin-top:4px;flex-shrink:0}.progress{height:5px;background:#edf2f6;border-radius:5px;margin:12px 0;overflow:hidden}.progress span{height:100%;display:block;background:var(--cyan)}.table-wrap{overflow:auto}table{width:100%;border-collapse:collapse;font-size:12px}th,td{text-align:left;padding:12px 10px;border-bottom:1px solid var(--line);white-space:nowrap}th{font-weight:500;color:var(--muted);background:#f5f8fb}td button{font-size:11px;padding:4px 8px}dialog{border:0;border-radius:16px;width:min(760px,calc(100vw - 30px));max-height:90vh;padding:28px;box-shadow:0 20px 80px #0b2c4b40;color:var(--ink)}dialog::backdrop{background:#0b233967;backdrop-filter:blur(3px)}dialog h2{margin:0 0 20px;font-size:21px}dialog textarea{min-height:110px}dialog .actions{justify-content:flex-end}#toast{position:fixed;left:50%;bottom:25px;transform:translateX(-50%);background:#173a53;color:white;border-radius:9px;padding:12px 22px;z-index:50;box-shadow:0 7px 20px #0b233930;display:none;max-width:90vw}#conflict{background:#fff1d7;padding:12px 30px;color:#7b521d}#conflict[hidden]{display:none}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:14px}.document-text{white-space:pre-wrap;word-break:break-word;font-size:13px;color:var(--ink)}.version-list{max-height:160px;overflow:auto;font-size:12px}.version-list button{padding:3px 9px;margin:4px}.form-footer{border-top:1px solid var(--line);padding-top:16px;margin-top:18px}.required{color:#a44444}.hidden{display:none!important}@media(min-width:1450px){main{padding-top:40px}.hero{min-height:220px}}@media(max-width:1100px){.library{grid-template-columns:repeat(2,minmax(0,1fr))}.cards{gap:10px}.metric{padding:16px}.split{grid-template-columns:1fr}.hero h1{font-size:26px}.mascot{right:15px}.sidebar{width:210px;padding:24px 16px}.shell{margin-left:210px}}@media(max-width:760px){.sidebar{position:relative;width:100%;padding:15px 18px;display:block}.brand{font-size:19px}.brand small{font-size:11px}.brand img{width:40px;height:34px}.workspace-label,.side-note,.website{display:none}nav{display:flex;overflow-x:auto;gap:5px;margin-top:15px;padding-bottom:2px}nav a{padding:8px 11px;white-space:nowrap;font-size:12px;gap:6px}nav svg{width:15px}.shell{margin-left:0}.topbar{padding:12px 18px;min-height:56px;font-size:12px}.status{display:none}.top-actions{gap:5px}.quiet{padding:5px 8px;font-size:11px}main{padding:20px 18px}.hero{padding:25px 23px;min-height:212px}.hero h1{font-size:25px;max-width:70%}.hero p{max-width:69%;font-size:12px}.mascot{width:100px;height:106px;right:4px;top:20px}.mascot img{width:300px}.cards{grid-template-columns:repeat(2,minmax(0,1fr))}.metric .number{font-size:25px}.grid2,.library,.form-grid,.two-col{grid-template-columns:1fr}.panel{padding:20px}.head{gap:12px}.head h1{font-size:23px}.head button{padding:8px 12px;font-size:12px}.bottom{padding:12px 18px;display:block}.bottom span{display:block}.field.full{grid-column:auto}.output{min-height:400px}dialog{padding:22px}.split{display:block}.toolbar input{max-width:none}.toolbar select{width:auto;max-width:160px}}@media print{.sidebar,.topbar,.bottom,.actions,.toolbar{display:none}.shell{margin:0}main{padding:0}.panel{border:0;box-shadow:none}.output{display:none}.printable{display:block!important}}

.footer-website{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--muted);flex-shrink:0;margin-left:auto}.footer-website img{width:65px;height:65px}.bottom{align-items:center}@media(max-width:760px){.footer-website{justify-content:flex-end;margin-top:12px}.footer-website img{width:65px;height:65px}}

/* Editable course presentation and attributed source library */
.deck-workspace{display:grid;grid-template-columns:minmax(285px,.8fr) minmax(0,1.3fr);gap:23px;align-items:start}.deck-input{padding:22px;min-width:0}.deck-input .form-grid{grid-template-columns:1fr 1fr}.deck-input textarea{min-height:390px;font-size:12px}.deck-input .actions{gap:8px}.deck-input .actions button{font-size:12px;padding:8px 10px}.deck-preview{min-width:0;position:sticky;top:20px}.preview-top{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:14px;font-size:12px;color:var(--muted)}.preview-top button{padding:6px 9px;font-size:12px;margin-left:5px}.slide-canvas{--slide-ink:#123b61;--slide-accent:#188b9c;position:relative;aspect-ratio:16/9;background:white;overflow:hidden;box-shadow:0 12px 32px #173c5b17;container-type:inline-size;color:var(--slide-ink);border:1px solid #d8e3eb}.theme-lake{--slide-ink:#124e5a;--slide-accent:#147d8c}.slide-dark{background:#102e4e;color:white}.slide-dark.theme-lake{background:#104854}.slide-brand{position:absolute;top:4.5%;left:4.3%;right:4%;display:flex;align-items:center;gap:1.5%;font-size:1.15cqw;color:#60788f}.slide-dark .slide-brand{color:#d9eaf2}.slide-brand>img{width:4.5%;height:auto;object-fit:contain}.slide-ip{position:absolute;width:5.2%;aspect-ratio:.94;right:0;top:-10%;overflow:hidden}.slide-ip img{width:300%;max-width:none;position:absolute;left:0;top:0}.slide-content{position:absolute;left:6.2%;right:6.2%;top:15.5%;bottom:17%}.slide-content h2{font-size:3.2cqw;line-height:1.4;margin:0 0 5%;font-weight:650}.slide-lines{font-size:2.1cqw;line-height:1.6;overflow-wrap:anywhere}.slide-lines p{margin:0 0 1.2%;color:inherit;font-size:inherit;white-space:pre-wrap}.slide-lines b{display:inline-block;min-width:7%;color:var(--slide-accent);font-weight:600}.layout-columns .slide-lines{columns:2;column-gap:7%}.layout-columns .slide-lines p{break-inside:avoid}.layout-cover .slide-content{top:25%}.layout-cover h2{font-size:4.2cqw;line-height:1.45;min-height:16cqw;margin:0 0 2%}.layout-cover .slide-lines{font-size:1.8cqw;color:#c6e2ec}.layout-section .slide-content{top:24%}.layout-section h2{font-size:3.6cqw;margin-bottom:8%}.layout-section .slide-lines{font-size:2.2cqw;color:#c6e2ec}.layout-exercise .slide-lines:before{content:'课堂练习';display:block;color:var(--slide-accent);font-size:1.6cqw;margin-bottom:4%}.slide-bottom{position:absolute;bottom:5%;right:4.5%;display:flex;align-items:flex-end;gap:2cqw;color:#60788f;font-size:1cqw}.slide-dark .slide-bottom{color:#d9eaf2}.slide-bottom>div{display:grid;justify-items:center;gap:.4cqw}.slide-bottom img{width:5cqw;height:5cqw}.slide-bottom small{font-size:.8cqw}.slide-thumbnails{display:flex;overflow:auto;gap:8px;margin-top:16px;padding-bottom:10px;max-width:100%}.slide-thumbnails button{flex:0 0 115px;max-width:115px;min-height:77px;padding:9px;font-size:11px;text-align:left;font-weight:400;line-height:1.5}.slide-thumbnails button span{display:block;font-size:10px;color:var(--muted);margin-bottom:5px}.slide-thumbnails .chosen{border-color:var(--cyan);background:#eaf5f8;box-shadow:inset 0 0 0 1px var(--cyan)}.source-links{display:flex;flex-wrap:wrap;gap:9px 14px;margin:15px 0 0;font-size:11px}.source-links a{color:#176380;text-underline-offset:3px}.source-original{white-space:pre-wrap;overflow-wrap:anywhere;font-family:inherit;font-size:12px;line-height:1.85;max-height:52vh;overflow:auto;background:#f4f8fb;border:1px solid var(--line);padding:18px;border-radius:7px}.deck-preview>.muted{margin-top:10px}@media(max-width:1200px){.deck-workspace{grid-template-columns:1fr}.deck-preview{position:static}.deck-input textarea{min-height:260px}}@media(max-width:760px){.deck-input .form-grid{grid-template-columns:1fr}.deck-input .field.full{grid-column:auto}.preview-top{gap:5px}.preview-top button{padding:5px 7px}.deck-workspace{gap:4px}.slide-thumbnails button{flex-basis:100px;min-height:70px}}
.knowledge-summary{display:flex;align-items:center;gap:18px;flex-wrap:wrap;padding:21px 25px;margin-bottom:18px;background:#e9f3f7;border:1px solid #cfe0e9;border-radius:12px}.knowledge-summary strong{color:var(--navy);font-size:18px}.knowledge-summary span{font-size:12px;color:var(--muted)}.knowledge-summary a{font-size:12px;color:#176380;margin-left:auto}.knowledge-snippet{padding:10px;background:#eff6f9;overflow-wrap:anywhere}.method-steps{padding-left:20px;color:#435e75;font-size:12px;line-height:1.8}.method-steps li{margin-bottom:8px}#knowledge-group{width:165px}.sidebar nav{min-height:0;overflow-y:auto}.sidebar .side-note{padding-top:15px}.sidebar .workspace-label{margin-top:23px}@media(max-width:760px){.knowledge-summary{padding:18px;gap:9px}.knowledge-summary a{margin-left:0}.sidebar nav{overflow-y:hidden;overflow-x:auto}}
.top-ip{width:32px;height:34px;position:relative;overflow:hidden;flex-shrink:0}.top-ip img{position:absolute;width:96px;max-width:none;left:0;top:0}@media(max-width:760px){.top-ip{width:26px;height:28px}.top-ip img{width:78px}}
.demo-link{display:inline-flex;align-items:center;justify-content:center;text-decoration:none;border:1px solid var(--line);border-radius:8px;padding:9px 15px;color:var(--ink);font-size:13px;font-weight:550;background:white;white-space:nowrap}.demo-link.primary{background:var(--blue);color:white;border-color:var(--blue)}.demo-link:hover{border-color:var(--cyan)}.demo-feature{display:grid;grid-template-columns:minmax(260px,.9fr) minmax(0,1.2fr);background:white;border:1px solid #cbdfe9;border-radius:16px;overflow:hidden;margin-bottom:25px}.demo-cover{display:flex;align-items:center;background:#e7eef5;padding:22px}.demo-cover img{display:block;width:100%;height:auto;box-shadow:0 8px 24px #0b2c4b20}.demo-feature-copy{padding:26px 28px}.demo-feature h2{font-size:25px;margin:12px 0 9px;line-height:1.45}.demo-feature h2 small,.demo-intro h1 small{display:block;font-size:17px;font-weight:500;margin-top:5px}.demo-feature p{color:var(--muted);margin:7px 0;font-size:13px}.demo-counts{display:flex;flex-wrap:wrap;gap:8px 15px;color:var(--muted);font-size:12px;margin-top:15px}.demo-back{display:flex;justify-content:space-between;gap:12px;margin-bottom:20px;font-size:12px;color:var(--muted)}.demo-back a{color:var(--blue);text-decoration:none}.demo-intro{display:flex;justify-content:space-between;align-items:center;gap:25px;margin-bottom:25px}.demo-intro h1{font-size:30px;line-height:1.4;margin:12px 0}.demo-intro h1 small{font-size:21px}.demo-intro p{color:var(--muted);font-size:13px;line-height:1.8}.demo-body{display:grid;grid-template-columns:205px minmax(0,1fr);gap:23px;align-items:start}.demo-materials h2{font-size:14px;margin:0 0 13px}.demo-tabs{display:grid;gap:9px}.demo-tabs button{text-align:left;padding:14px 16px}.demo-tabs button span,.demo-tabs button small{display:block}.demo-tabs button span{font-size:14px}.demo-tabs button small{color:var(--muted);font-size:11px;margin-top:4px;font-weight:400}.demo-tabs button[aria-selected=true]{border-color:#398cab;background:#e8f4f8;box-shadow:inset 3px 0 var(--cyan)}.demo-usage{margin-top:23px;padding:0 4px}.demo-usage h3{font-size:12px;margin:17px 0 7px}.demo-usage p{font-size:12px;color:var(--muted);line-height:1.85;margin:0 0 12px}.demo-viewer{min-width:0;background:white;border:1px solid var(--line);border-radius:14px;overflow:hidden}.demo-viewer-head{padding:22px 23px 18px;border-bottom:1px solid var(--line)}.demo-viewer-head h2{font-size:19px;margin:0 0 6px}.demo-viewer-head p{font-size:12px;color:var(--muted);margin:0;line-height:1.8}.demo-file-links{display:flex;align-items:center;flex-wrap:wrap;gap:12px;margin-top:15px}.demo-file-links>a:not(.demo-link){font-size:12px;color:var(--blue);text-underline-offset:3px}.demo-pagebar{display:flex;gap:9px;align-items:center;justify-content:center;padding:15px;background:#f7f9fc;flex-wrap:wrap}.demo-pagebar button{font-size:12px;padding:7px 11px}.demo-pagebar select{width:128px;font-size:12px;padding:7px}.demo-pagebar label{font-size:11px}.demo-page{margin:0;padding:20px;background:#e9eff5}.demo-page img{display:block;width:100%;height:auto;background:white;box-shadow:0 4px 18px #18314815}.demo-page a{display:block;cursor:zoom-in}.demo-page.is-document a{max-width:760px;margin:auto}.demo-page figcaption{text-align:center;font-size:11px;color:var(--muted);padding-top:13px}.demo-preview-note{font-size:11px;color:var(--muted);margin:0;padding:13px 20px}.demo-notes{margin-top:25px;padding:21px 25px;background:#eaf3f7;border:1px solid #d2e3eb;border-radius:13px}.demo-notes h2{font-size:15px;margin:0 0 10px}.demo-notes p{font-size:12px;color:#526a7f;margin:7px 0;line-height:1.9}@media(max-width:1100px){.demo-feature{grid-template-columns:1fr 1.1fr}.demo-cover{padding:15px}.demo-feature-copy{padding:21px}.demo-body{grid-template-columns:170px minmax(0,1fr);gap:16px}.demo-intro{align-items:flex-start;flex-wrap:wrap}}@media(max-width:760px){.demo-feature{grid-template-columns:1fr}.demo-cover{padding:18px}.demo-feature h2{font-size:23px}.demo-intro h1{font-size:27px}.demo-intro h1 small{font-size:18px}.demo-intro>.demo-link{width:100%}.demo-body{grid-template-columns:1fr}.demo-tabs{grid-template-columns:1fr 1fr;gap:8px}.demo-tabs button{padding:12px}.demo-usage{display:none}.demo-materials h2{margin-bottom:10px}.demo-viewer-head{padding:18px}.demo-page{padding:10px}.demo-pagebar{gap:6px;padding:12px 8px}.demo-pagebar label{display:none}.demo-pagebar button{padding:7px 9px}.demo-pagebar select{width:117px}.demo-back{font-size:11px}.demo-notes{padding:18px}.demo-feature .actions>.demo-link{flex:1;font-size:12px}}
@media(min-width:761px) and (max-height:850px){nav{gap:3px}nav a{padding:7px 13px;font-size:13px}.sidebar .workspace-label{margin:19px 10px 12px}.sidebar .side-note{padding:13px 10px 14px}.sidebar .website{padding-top:12px}}