/* Concept diagrams describe course content. */
.entity-label{display:block;font:11px var(--mono);letter-spacing:1.3px;color:var(--muted);margin-bottom:12px}.diagram-area{max-width:480px;width:100%;margin:auto}.diagram-caption{text-align:center;color:var(--muted);font-size:13px;line-height:1.7;margin:15px 0 0}.object-model{border:1px solid #bdd0fc;border-radius:9px;overflow:hidden}.object-model-title{background:var(--pale);padding:20px 24px;border-bottom:1px solid #cbd8fa}.object-model-title>span{font:11px var(--mono);letter-spacing:1.5px;color:var(--blue)}.object-model-title h3{font-size:30px;margin:8px 0 4px}.object-model-title p{margin:0;color:var(--muted);font-size:13px}.model-row{display:grid;grid-template-columns:1fr 1fr;gap:20px;padding:18px 24px;line-height:1.85}.model-row+ .model-row{border-top:1px solid var(--line)}.model-row>span{font-size:13px;color:var(--muted)}.model-row>div{font-size:17px}.model-row code{font-size:15px;color:var(--blue)}.class-box{border:1px solid #bbccf5;border-radius:8px;background:var(--pale);text-align:center;padding:19px 24px;width:min(280px,100%);margin:auto}.class-box .entity-label{color:var(--blue);margin-bottom:7px}.class-box h3{font-size:29px;margin:4px 0 11px}.class-box>div{border-top:1px solid #c5d4f7;padding-top:11px;font-size:15px;line-height:1.9}.branch{height:52px;position:relative;margin:auto;width:50%;border-bottom:1px solid #9cb5ee}.branch::before{content:"";position:absolute;left:50%;top:0;height:100%;border-left:1px solid #9cb5ee}.branch span{position:absolute;top:13px;left:calc(50% + 10px);font-size:12px;color:var(--muted);white-space:nowrap}.instances{display:grid;grid-template-columns:1fr 1fr;gap:28px;padding-top:21px}.instances>div{position:relative;border:1px solid var(--line);border-radius:7px;text-align:center;padding:16px}.instances>div::before{content:"";position:absolute;left:50%;top:-22px;height:21px;border-left:1px solid #9cb5ee}.instances span{font:10px var(--mono);letter-spacing:1px;color:var(--muted);display:block}.instances strong{display:block;margin:8px 0;font-size:23px}.instances p{font-size:13px;color:var(--muted);margin:0}.message-flow{display:grid;grid-template-columns:1fr 1.2fr 1fr;gap:25px;align-items:center;margin:22px 0 34px}.message-object{border:1px solid var(--line);border-radius:8px;text-align:center;padding:32px 12px;background:#f8faff}.message-object>span{color:var(--muted);font-size:12px}.message-object strong{display:block;font-size:26px;margin:12px 0}.message-object p{font-size:13px;color:var(--muted);margin:0}.message-object.receiver{background:var(--pale);border-color:#bdcefc}.message-connection{text-align:center;min-width:0}.message-connection code{font-size:18px;color:var(--blue)}.connector-line{height:2px;background:#91abef;margin:18px 0 12px;position:relative}.connector-line::after{content:"";position:absolute;right:0;top:-4px;border-style:solid;border-width:5px 0 5px 7px;border-color:transparent transparent transparent #91abef}.message-connection>span{font-size:12px;color:var(--muted)}.message-bottom{display:grid;grid-template-columns:1fr 1fr;gap:40px;border-top:1px solid var(--line);padding-top:22px}.message-bottom h3{font-size:19px;margin-bottom:8px}.message-bottom p{font-size:15px;color:var(--muted);margin:0}.abstraction-flow{display:grid;grid-template-columns:1fr 1.65fr 1fr;gap:30px;align-items:center;margin:12px 0 25px}.abstract-examples>div{background:#f4f6fb;border:1px solid var(--line);padding:11px 17px;margin-bottom:7px;text-align:center;border-radius:5px;font-size:16px}.abstract-filter{border-left:1px solid #bbccf5;border-right:1px solid #bbccf5;padding:20px 23px;text-align:center}.abstract-filter>div{display:grid;grid-template-columns:1fr 1fr;gap:9px}.abstract-filter>div span{background:var(--pale);padding:10px 7px;border-radius:4px;font-size:15px;color:var(--blue)}.abstract-filter p{font-size:12px;color:var(--muted);margin:12px 0 0}.abstract-result{text-align:center;background:var(--blue);color:white;padding:32px 15px;border-radius:8px}.abstract-result .entity-label{color:#d8e2ff}.abstract-result h3{font-size:39px;margin:15px 0}.abstract-result p{font-size:14px;margin:0;color:#d8e2ff}.abstract-explanation{height:auto;border-top:1px solid var(--line);padding-top:20px}.abstract-explanation h3{font-size:18px;margin:0 0 6px}.abstract-explanation p{font-size:14px;color:var(--muted);margin:0}.encapsulation-model{max-width:440px;width:100%;margin:auto}.outside-label{text-align:center;color:var(--muted);font-size:15px;margin-bottom:26px;position:relative}.outside-label::after{content:"";position:absolute;left:50%;top:100%;height:26px;border-left:1px solid #91abef}.interface-bar{padding:20px 23px;background:var(--blue);color:white;border-radius:8px 8px 0 0;display:flex;flex-direction:column;gap:12px;text-align:center}.interface-bar>span{font-size:13px;opacity:.8}.interface-bar code{font-size:16px}.inside-model{border:1px dashed #9db6ee;border-top:0;background:#f8faff;border-radius:0 0 8px 8px;padding:24px}.inside-model>div{display:flex;justify-content:space-between;gap:14px;margin-bottom:17px}.inside-model span{font-size:13px;color:var(--muted)}.inside-model strong{font-size:15px;font-weight:500}.inside-model p{text-align:center;color:var(--muted);font-size:12px;border-top:1px solid var(--line);padding-top:14px;margin:15px 0 0}.inheritance-diagram{width:100%;max-width:440px;margin:auto}.inheritance-diagram .class-box{width:100%;max-width:300px;padding:17px 23px}.inheritance-diagram .class-box h3{font-size:25px;margin:4px 0 8px}.inheritance-diagram .class-box>div{font-size:14px}.inheritance-line{position:relative;height:49px;text-align:center}.inheritance-line::before{content:"";position:absolute;left:50%;height:100%;border-left:1px solid #95ace0}.inheritance-line span{position:absolute;left:calc(50% + 12px);top:14px;font-size:12px;color:var(--muted)}.class-box.derived{background:#f9fbff;border-color:#c8d5f4}.class-box.derived strong{color:var(--blue)}.poly-interface{text-align:center;padding:15px 0 20px}.poly-interface code{font:500 30px var(--mono);color:var(--blue)}.poly-interface p{font-size:13px;color:var(--muted);margin:10px 0 0}.poly-branches{display:grid;grid-template-columns:repeat(3,1fr);gap:30px;margin:15px 0 0;border-top:1px solid #adc2f2;padding-top:24px;position:relative}.poly-branches::before{content:"";position:absolute;top:-23px;left:50%;height:23px;border-left:1px solid #adc2f2}.poly-branches>div{position:relative;text-align:center;background:#f6f8fd;border-radius:7px;padding:20px 10px}.poly-branches>div::before{content:"";position:absolute;left:50%;top:-25px;height:24px;border-left:1px solid #adc2f2}.shape-diagram{height:60px;width:70px;stroke:var(--blue);stroke-width:2;fill:#e5edff}.poly-branches h3{font-size:20px;margin:13px 0 7px}.poly-branches p{font-size:13px;color:var(--muted);margin:0}
.timeline{display:grid;grid-template-columns:repeat(4,1fr);gap:25px;margin:24px 0 35px}.timeline-step{position:relative}.timeline-step::before{content:"";position:absolute;top:52px;left:4px;width:calc(100% + 25px);height:1px;background:#ced9ef}.timeline-step:last-child::before{width:calc(100% - 4px)}.timeline-year{font:400 30px var(--mono);color:var(--ink);letter-spacing:-1px}.timeline-dot{width:9px;height:9px;border-radius:50%;background:#bccbef;margin:17px 0 22px;position:relative;z-index:1}.timeline-step.featured .timeline-year{color:var(--blue)}.timeline-step.featured .timeline-dot{background:var(--blue);box-shadow:0 0 0 5px var(--pale)}.timeline-step h3{font-size:17px;line-height:1.6;margin-bottom:11px}.timeline-step p{font-size:13px;line-height:1.9;color:var(--muted);margin:0}.standard-strip{display:flex;align-items:center;justify-content:space-between;gap:15px;padding:22px;background:var(--pale);border-radius:7px;flex-wrap:wrap}.standard-strip>span{font-size:12px;color:var(--muted)}.standard-strip strong{font:500 17px var(--mono);color:var(--blue)}.standard-strip i{height:14px;width:1px;background:#ccd9f8}.small-note{font-size:12px;color:var(--muted);margin:13px 0 0}.applications-layout{height:auto}.feature-row{display:grid;grid-template-columns:30px 1fr;gap:13px;padding:9px 0 13px}.feature-row>span{font:11px var(--mono);padding-top:6px;color:var(--blue)}.feature-row h3{font-size:18px;margin:0 0 5px}.feature-row p{font-size:14px;color:var(--muted);margin:0}.applications{padding-left:30px;border-left:1px solid var(--line);display:grid;grid-template-columns:1fr 1fr;gap:15px}.applications>.slide-label{grid-column:1/-1;margin-bottom:0}.applications>div{background:#f4f7fe;padding:18px 16px;border-radius:6px}.applications>div>span{font:11px var(--mono);color:var(--blue)}.applications h3{font-size:17px;margin:10px 0 6px}.applications p{font-size:13px;color:var(--muted);margin:0;line-height:1.7}.build-pipeline{display:grid;grid-template-columns:repeat(5,1fr);gap:20px;margin:15px 0 28px}.build-pipeline>div{padding:17px 15px 18px;background:#f5f7fc;border-top:2px solid #acbce1;position:relative}.build-pipeline>div:last-child{background:var(--pale);border-color:var(--blue)}.build-pipeline>div:not(:last-child)::after{content:"›";position:absolute;right:-16px;top:50%;color:#8da3d4;font-size:25px}.build-pipeline>div>span{font:11px var(--mono);color:var(--muted)}.build-pipeline h3{font-size:23px;margin:10px 0 8px}.build-pipeline p{font-size:12px;color:var(--muted);line-height:1.65;margin-bottom:12px}.build-pipeline code{font-size:11px;color:var(--blue)}.table-wrap{overflow:auto;max-width:100%}.lesson-table{border-collapse:collapse;width:100%;font-size:15px;line-height:1.7;text-align:left}.lesson-table th{font-weight:600;background:#f4f7fe;color:#47618c;font-size:13px;white-space:nowrap}.lesson-table th,.lesson-table td{border-bottom:1px solid var(--line);padding:13px 18px;vertical-align:middle}.lesson-table td:first-child{white-space:nowrap}.lesson-table.compact{font-size:14px}.lesson-table.compact th,.lesson-table.compact td{padding:9px 16px}.manipulators td{padding:13px 18px;font-size:14px}.manipulators th{padding:12px 18px}.namespace-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.namespace-grid h3{font-size:18px;margin-bottom:17px}.namespace-grid .code-panel pre{font-size:12px;padding:14px 10px}.namespace-grid .line-number{margin-right:.7em;width:1.5em}.namespace-grid .code-header{padding:10px 11px;font-size:11px}.namespace-grid .copy-btn>span{display:none}.io-grid{display:grid;grid-template-columns:1fr 1fr;gap:35px}.io-block{border-top:2px solid var(--blue);padding-top:20px}.io-title{display:flex;align-items:center;justify-content:space-between;margin:12px 0}.io-title h3{font:600 56px var(--mono);margin:0;color:var(--blue)}.io-title>span{font:400 45px var(--mono);color:#a2b8f7;letter-spacing:-9px;padding-right:8px}.io-block>p{font-size:14px;color:var(--muted);margin-bottom:20px}.io-caption{display:flex;align-items:center;gap:14px;justify-content:center;color:var(--muted);font-size:13px;padding-top:19px}.io-caption i{width:40px;height:1px;background:#a4b7e4;position:relative}.io-caption i::after{content:"";border:4px solid transparent;border-left-color:#a4b7e4;position:absolute;right:-4px;top:-3.5px}.average-formula{background:var(--pale);border-radius:6px;padding:16px 19px;margin-bottom:19px}.average-formula>span{display:block;font-size:12px;color:var(--muted);margin-bottom:9px}.average-formula strong{font:400 23px var(--mono);letter-spacing:-.8px;color:var(--blue)}.average-explanation .point-list li{margin-bottom:14px}.average-explanation .point-list li span{font-size:12px}.summary-layout{display:grid;grid-template-columns:1fr 1fr;gap:40px}.summary-concepts{border-right:1px solid var(--line);padding-right:30px}.summary-concepts h3{font-size:31px;margin:18px 0}.summary-concepts>p{font-size:15px;color:var(--muted);line-height:1.9}.summary-four{display:flex;gap:10px;flex-wrap:wrap;margin:22px 0}.summary-four span{padding:8px 15px;background:var(--pale);color:var(--blue);font-size:14px;border-radius:4px}.summary-path{display:flex;align-items:center;gap:9px;color:var(--muted);font-size:12px;padding-top:12px;flex-wrap:wrap}.summary-path i{width:8px;height:1px;background:#a4b7e4}.summary-practice>div{border-bottom:1px solid var(--line);padding:17px 0}.summary-practice>div:last-child{border-bottom:0}.summary-practice strong{font-size:17px}.summary-practice p{font-size:14px;color:var(--muted);line-height:1.8;margin:8px 0 0}.chapter-closing{border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;margin-top:30px;padding-top:21px;gap:20px}.chapter-closing>span{font:11px var(--mono);letter-spacing:1px;color:var(--blue)}.chapter-closing strong{font-size:16px;font-weight:500}
:fullscreen .sidebar{display:none}:fullscreen .workspace{grid-template-columns:1fr}:fullscreen .main{padding-left:6vw;padding-right:6vw}:fullscreen .progress-track{margin-left:-6vw;margin-right:-6vw}:fullscreen .slide-title{font-size:clamp(30px,3vw,50px)}:fullscreen .cover h1{font-size:clamp(40px,4.5vw,75px)}
@media(min-width:1550px){.model-row>div{font-size:22px}.model-row>span{font-size:16px}.class-box>div{font-size:19px}.class-box h3{font-size:35px}.timeline-step h3{font-size:22px}.timeline-step p{font-size:16px}.feature-row h3{font-size:22px}.feature-row p{font-size:17px}.applications h3{font-size:21px}.applications p{font-size:16px}.lesson-table{font-size:18px}.manipulators td,.lesson-table.compact{font-size:17px}.lesson-table th{font-size:16px}.namespace-grid .code-panel pre{font-size:15px}.namespace-grid h3{font-size:22px}.build-pipeline h3{font-size:30px}.build-pipeline p{font-size:16px}.build-pipeline code{font-size:14px}.summary-concepts h3{font-size:39px}.summary-concepts>p{font-size:19px}.summary-practice p{font-size:18px}}
@media(max-height:720px) and (min-width:821px){.model-row{padding:13px 20px}.object-model-title{padding:14px 20px}.object-model-title h3{font-size:26px}.class-box{padding:12px 20px}.class-box>div{font-size:13px}.class-box h3{font-size:24px}.inheritance-diagram .class-box{padding:12px 20px}.inheritance-line{height:38px}.diagram-caption{font-size:11px;margin-top:10px}.message-flow{margin:10px 0 22px}.message-object{padding:23px 12px}.message-bottom{padding-top:17px}.abstract-examples>div{padding:8px 14px}.abstract-result{padding:24px 12px}.abstract-filter{padding:14px 20px}.abstract-filter>div span{padding:8px 5px}.abstract-explanation{padding-top:13px}.abstraction-flow{margin-bottom:18px}.inside-model{padding:19px}.poly-interface{padding:4px 0 15px}.poly-interface code{font-size:25px}.poly-branches{padding-top:18px;margin-top:10px}.poly-branches>div{padding:13px 10px}.shape-diagram{height:47px}.poly-branches h3{font-size:17px}.timeline{margin:10px 0 22px;gap:22px}.timeline-step p{font-size:12px}.timeline-year{font-size:26px}.timeline-step::before{top:48px}.timeline-step h3{font-size:15px}.standard-strip{padding:17px}.standard-strip strong{font-size:14px}.feature-row{padding:5px 0 8px}.feature-row h3{font-size:16px}.feature-row p{font-size:13px}.applications{gap:10px}.applications>div{padding:13px}.applications h3{font-size:15px}.applications p{font-size:12px}.build-pipeline{margin:7px 0 20px;gap:16px}.build-pipeline>div{padding:12px}.build-pipeline>div:not(:last-child)::after{right:-13px}.build-pipeline h3{font-size:20px}.build-pipeline p{font-size:11px}.lesson-table.compact th,.lesson-table.compact td{padding:7px 13px;font-size:12px}.manipulators td,.manipulators th{font-size:12px;padding:10px 13px}.namespace-grid .code-panel pre{font-size:11px;line-height:1.7}.namespace-grid .code-line{min-height:1.7em}.namespace-grid h3{font-size:16px;margin-bottom:12px}.io-title h3{font-size:45px}.io-block{padding-top:15px}.io-block>p{font-size:13px}.io-grid{gap:26px}.io-title{margin:8px 0}.average-formula{padding:12px 15px;margin-bottom:15px}.average-formula strong{font-size:21px}.average-explanation .point-list li{margin-bottom:9px}.output{margin-top:12px;padding:10px 13px}.output pre{font-size:11px}.summary-concepts h3{font-size:27px;margin:12px 0}.summary-concepts>p{font-size:14px}.summary-four{margin:16px 0}.summary-four span{padding:6px 11px}.summary-practice>div{padding:13px 0}.summary-practice strong{font-size:15px}.summary-practice p{font-size:12px}.chapter-closing{margin-top:22px;padding-top:17px}.chapter-closing strong{font-size:14px}}
@media(max-width:1100px){.namespace-grid{gap:12px}.namespace-grid h3{font-size:16px}.namespace-grid .code-panel pre{font-size:10px;padding:12px 8px}.namespace-grid .line-number{margin-right:.5em}.namespace-grid .code-header{font-size:10px;padding:9px}.class-box{padding:15px 18px}.class-box>div{font-size:13px}.model-row{padding:15px 19px}.timeline{gap:18px}.timeline-step p{font-size:12px}.timeline-step h3{font-size:15px}.standard-strip{gap:10px}.standard-strip strong{font-size:14px}.build-pipeline{gap:13px}.build-pipeline>div{padding:13px 10px}.build-pipeline>div:not(:last-child)::after{right:-12px}.build-pipeline h3{font-size:20px}.applications{padding-left:20px}.applications>div{padding:13px}.applications h3{font-size:15px}.average-formula strong{font-size:19px}.summary-layout{gap:24px}.summary-concepts{padding-right:20px}.summary-concepts h3{font-size:25px}.summary-path{font-size:11px;gap:6px}.chapter-closing strong{font-size:14px}}
@media(max-width:600px){.diagram-area{max-width:360px}.model-row>div{font-size:17px}.message-flow{grid-template-columns:1fr;margin:0 0 24px;gap:22px}.message-object{padding:22px}.message-connection{padding:0 20px}.message-connection code{font-size:17px}.message-bottom{grid-template-columns:1fr;gap:20px}.abstraction-flow{grid-template-columns:1fr;gap:20px;margin:0 0 23px}.abstract-examples{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.abstract-examples>.entity-label{grid-column:1/-1}.abstract-filter{border:1px solid #bbccf5;border-radius:6px}.abstract-result{padding:20px}.abstract-result h3{margin:8px 0;font-size:31px}.abstract-explanation{display:grid;grid-template-columns:1fr;gap:18px}.poly-branches{gap:9px}.poly-branches>div{padding:13px 5px}.poly-branches h3{font-size:14px;margin:10px 0 5px}.poly-branches p{font-size:11px;line-height:1.6}.shape-diagram{height:45px;width:50px}.poly-interface code{font-size:26px}.timeline{grid-template-columns:1fr;gap:19px;margin:6px 0 24px}.timeline-step{padding-left:25px;border-left:1px solid #c5d2ef}.timeline-year{font-size:24px}.timeline-dot{position:absolute;top:4px;left:-5px;margin:0}.timeline-step::before{display:none}.timeline-step h3{font-size:18px;margin:10px 0 6px}.timeline-step p{font-size:14px}.standard-strip{justify-content:flex-start;gap:14px}.standard-strip>span{width:100%}.standard-strip strong{font-size:15px}.standard-strip i{display:none}.applications{border:0;border-top:1px solid var(--line);padding:24px 0 0}.applications h3{font-size:17px}.applications p{font-size:13px}.feature-row h3{font-size:18px}.feature-row p{font-size:14px}.build-pipeline{grid-template-columns:1fr;gap:13px}.build-pipeline>div{display:grid;grid-template-columns:24px 60px 1fr;gap:8px;align-items:center;border-top:0;border-left:2px solid #acbce1;padding:16px 12px}.build-pipeline>div:last-child{border-left-color:var(--blue)}.build-pipeline h3{font-size:18px;margin:0}.build-pipeline p{font-size:12px;margin:0}.build-pipeline code{grid-column:3;font-size:12px}.build-pipeline>div:not(:last-child)::after{display:none}.lesson-table th,.lesson-table td{padding:11px 12px;font-size:13px}.lesson-table.compact th,.lesson-table.compact td{padding:10px;font-size:12px}.lesson-table.compact td:first-child{white-space:normal}.manipulators{min-width:500px}.namespace-grid{grid-template-columns:1fr;gap:25px}.namespace-grid h3{font-size:20px}.namespace-grid .code-panel pre{font-size:13px;padding:16px}.namespace-grid .code-header{font-size:12px;padding:12px 15px}.namespace-grid .copy-btn>span{display:inline}.io-grid{grid-template-columns:1fr;gap:30px}.io-title h3{font-size:50px}.io-block>p{font-size:14px}.io-caption{font-size:14px}.summary-layout{grid-template-columns:1fr;gap:25px}.summary-concepts{border:0;border-bottom:1px solid var(--line);padding:0 0 22px}.summary-concepts h3{font-size:28px}.summary-path{font-size:12px}.summary-practice p{font-size:14px}.chapter-closing{display:block;margin-top:24px}.chapter-closing>span{display:block;margin-bottom:12px}.chapter-closing strong{font-size:17px;line-height:1.7}:fullscreen .main{padding-left:12px;padding-right:12px}:fullscreen .progress-track{margin:0 -12px}}
@media(max-height:720px) and (min-width:821px){.code-panel pre{line-height:1.55}.code-line{min-height:1.55em}}
.reading #slides{grid-template-columns:minmax(0,1fr)}.slide,.slide-body,.two-col>*{min-width:0}

/* Preserve instructional diagrams and provide the complete source slide. */
.build-flow{margin:0;width:100%}.build-flow img{display:block;width:100%;height:auto}.source-detail{margin-top:12px;border-top:1px solid var(--line);padding-top:12px;font-size:14px;line-height:1.75;color:var(--muted)}.source-detail summary{cursor:pointer;color:var(--blue);font-weight:500}.source-detail p{margin:12px 0 0}.source-detail .table-wrap{margin-top:14px}.source-diagram{display:block;width:100%;max-width:850px;height:auto;margin:16px auto 0;border:1px solid var(--line);border-radius:5px}.stdio-source{max-width:550px}.footer-resources{display:flex;align-items:center;gap:12px}#source-dialog{width:min(1200px,95vw);max-width:95vw;padding:22px}#source-dialog .dialog-heading{margin-bottom:14px}.source-view{overflow:auto;max-height:75dvh}.source-view img{display:block;width:100%;height:auto}.build-detail .slide-deck{margin-bottom:12px}.build-detail .slide-body{flex:0}.build-detail .file-reference{margin-bottom:12px}
@media(max-width:600px){.build-flow{overflow-x:auto;padding-bottom:8px}.build-flow img{min-width:780px}.build-flow::after{content:"横向滑动查看完整流程图";display:block;color:var(--muted);font-size:12px;margin-top:8px}.footer-resources{gap:5px}.footer-resources .text-btn{font-size:12px}#source-dialog{padding:12px}.source-view img{min-width:1000px}.source-detail{font-size:14px}}
@media(max-height:720px) and (min-width:821px){.build-detail{padding-bottom:18px}.build-detail .file-reference{margin-top:8px;padding-top:8px;margin-bottom:4px}}