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@media(max-width:850px){.visual{z-index:10}.story-text{z-index:6}}
/* Part 02: the same visual language, with deeper source-grounded lessons. */
.learning-phases{display:flex;flex-wrap:wrap;gap:8px;margin-top:23px}.learning-phases span{font-size:12px;padding:4px 8px;border:1px solid var(--line);border-radius:5px;color:var(--muted)}.level-transition{border-top:1px solid var(--mint);padding:70px 0 65px}.level-transition h2{margin:22px 0}.level-transition>p{max-width:700px;font-size:18px}.learning-route{display:flex;flex-wrap:wrap;gap:9px;margin-top:28px}.learning-route a{border:1px solid var(--line);border-radius:5px;padding:8px 12px;font-size:14px;text-decoration:none}.learning-route a:hover{border-color:var(--mint);color:var(--mint)}.deep-chapter{margin-bottom:80px}.lesson{display:grid;grid-template-columns:55px minmax(0,1fr);gap:25px;padding:38px 0;border-top:1px solid var(--line)}.lesson-index{font:16px Consolas,monospace;color:var(--mint);align-self:start;position:sticky;top:115px;opacity:.55;transition:opacity .35s}.lesson.in-view .lesson-index{opacity:1}.lesson>div>h3{font-size:26px;margin-bottom:18px}.lesson>div>p{font-size:17px;line-height:1.9;max-width:880px;margin:18px 0}.lesson a,.section-explain a{color:var(--mint)}.term-note{padding:20px 22px;border:1px solid #89f0c140;background:#89f0c107;margin-top:24px}.term-note>b{color:var(--mint);font-size:15px;font-weight:600}.term-note p{font-size:16px;line-height:1.85;margin-top:7px;color:#bed0c8}.lesson-code{border:1px solid var(--line);border-radius:8px;overflow:hidden;background:#151f21;margin-top:22px}.lesson-code pre{padding:22px;font-size:14px;line-height:1.9;color:#d3e0da;tab-size:2}.lesson-code .card-top{font-size:14px}.code-reading{font-size:15px!important;padding-left:0;margin-top:16px!important}.nested-model{background:#121c1e;padding:18px;border:1px solid var(--line);border-radius:8px;margin:22px 0}.nested-model div{border:1px solid #89f0c130;padding:17px;border-radius:5px}.nested-model div>div{margin-top:12px;background:#89f0c105}.nested-model span{font-size:14px;color:var(--muted)}.nested-model b{display:block;font-size:17px;color:var(--mint);font-weight:500;margin-top:10px}.argument-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin:24px 0}.argument-grid b{font-size:16px;font-weight:500;color:var(--mint)}.argument-grid p{font-size:15px;margin-top:7px;line-height:1.8}.chain-directions{padding:22px;border:1px solid var(--line);border-radius:8px}.chain-directions p{font-size:16px;color:#cedbd6}.chain-directions b{color:var(--mint);font-weight:500;margin-right:20px}.chain-directions p+p{margin-top:12px}.table-wrap{max-width:100%;overflow-x:auto;border:1px solid var(--line);border-radius:8px;margin:24px 0}table{border-collapse:collapse;width:100%;font-size:15px;text-align:left}th{background:#20302e;color:var(--mint);font-weight:500;padding:15px}td{border-top:1px solid var(--line);padding:15px;color:#c3d0cb;vertical-align:top}td code{font-size:13px}td:first-child{white-space:nowrap}.api-shelf,.risk-list{display:flex;flex-wrap:wrap;gap:9px;margin:22px 0}.api-shelf code,.risk-list code,.risk-list span{padding:6px 10px;border:1px solid var(--line);border-radius:5px;font-size:14px}.risk-list code,.risk-list span{color:var(--orange)}.compare-pair{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:22px 0}.compare-pair>div{padding:22px;border:1px solid var(--line);border-radius:8px}.compare-pair b{color:var(--mint);font-weight:500;font-size:18px}.compare-pair p{font-size:16px;line-height:1.9;margin-top:12px}.video-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin:35px 0 55px}.source-video{margin:0;padding:18px;border:1px solid var(--line);border-radius:10px;background:var(--panel)}.video-label{font-size:14px;color:var(--mint);margin-bottom:12px}.source-video video{display:block;width:100%;aspect-ratio:16/10;background:#0d1214;border-radius:5px;object-fit:contain}.source-video figcaption{font-size:14px;color:var(--muted);line-height:1.85;margin-top:15px}.source-video>a{display:inline-block;font-size:13px;color:var(--mint);margin-top:10px;text-underline-offset:3px}.file-map{border:1px solid var(--line);border-radius:8px;overflow:hidden;margin:25px 0}.file-map>div{padding:14px 20px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;gap:20px;align-items:center}.file-map>div:last-child{border:0}.file-map code{font-size:14px}.file-map span{font-size:13px;color:var(--muted);text-align:right;min-width:135px}.file-map .later{background:#ffffff03}.file-map .later code{color:#bbc9c4}.error-message{padding:20px;border:1px solid #ffa57650;background:#ffa57605;border-radius:7px}.error-message code{color:var(--orange);font-size:14px}.module-toolbar{display:flex;justify-content:space-between;align-items:center;gap:20px;margin:28px 0;font-size:14px;color:var(--muted);padding:18px;border:1px solid var(--line);border-radius:7px}.props-map{margin-top:25px;border:1px solid var(--line);border-radius:8px;overflow:hidden}.props-map>div{padding:19px;display:flex;flex-wrap:wrap;gap:20px;border-bottom:1px solid var(--line)}.props-map>div:last-child{border:0}.props-map span{font-size:14px;color:var(--muted);min-width:180px}.props-map code{font-size:14px}.section-explain{font-size:17px;line-height:1.9;margin:25px 0}.test-sequence{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:25px 0}.test-sequence>div{padding:18px;border:1px solid var(--line);border-radius:7px}.test-sequence span{font-size:13px;color:var(--muted);display:block}.test-sequence b{font-size:19px;font-weight:500;color:var(--mint);display:block;margin:10px 0}.test-sequence small{font-size:12px;color:var(--muted);display:block}.debug-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:25px 0}.debug-grid>div{border:1px solid var(--line);border-radius:7px;padding:22px}.debug-grid b{font-size:17px;color:var(--mint);font-weight:500}.debug-grid p{font-size:16px;line-height:1.85;margin-top:10px}.flow-notes{padding:18px 22px;border:1px solid var(--line);border-radius:7px;margin:25px 0}.flow-notes p{font-size:15px;padding:9px 0;border-bottom:1px solid var(--line)}.flow-notes p:last-child{border:0}.flow-notes b{display:inline-block;color:var(--mint);min-width:150px;font-weight:500}.surface-comparison{display:grid;grid-template-columns:1fr 1fr;gap:25px;margin:25px 0}.surface-comparison b{font-size:16px;font-weight:500;color:#d4e0da}.surface-box{display:flex;gap:7px;border:1px solid var(--line);border-radius:5px;padding:13px;min-height:125px;margin:13px 0}.surface-box>span{flex:1;border:1px solid var(--line);padding:18px 10px;font-size:14px;color:var(--muted);display:flex;align-items:center;justify-content:center}.surface-box .pane{color:var(--mint);border-color:#89f0c160;background:#89f0c107}.surface-box.narrow{flex-direction:column}.surface-box.narrow>span{padding:7px}.surface-comparison p{font-size:14px}.idea-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:25px 0}.idea-grid>div{border:1px solid var(--line);border-radius:8px;padding:23px}.idea-grid>div:last-child{grid-column:1/-1}.idea-grid span{font-size:13px;color:var(--muted)}.idea-grid h4{font-size:23px;margin:11px 0}.idea-grid code{font-size:13px}.idea-grid p{font-size:16px;line-height:1.8;margin-top:14px}.mastery-check{border-top:1px solid var(--mint);padding:32px;margin-top:50px;background:#89f0c105;border-radius:0 0 8px 8px}.mastery-check h3{margin:18px 0}.mastery-check ol{padding-left:25px;font-size:17px;color:#c9d7d0;line-height:1.8}.mastery-check li{margin:12px 0}.mastery-check p{font-size:16px;line-height:1.8}
@media(max-width:850px){.lesson{grid-template-columns:30px minmax(0,1fr);gap:14px;padding:30px 0}.lesson-index{font-size:14px;top:100px}.lesson>div>h3{font-size:23px}.lesson>div>p{font-size:16px}.argument-grid{grid-template-columns:1fr;gap:15px}.argument-grid>div{border-bottom:1px solid var(--line);padding-bottom:13px}.lesson-code pre{font-size:13px;padding:18px}.lesson-code .card-top{font-size:12px}.term-note{padding:17px}.term-note p{font-size:15px}.file-map>div{display:block;padding:13px}.file-map span{display:block;text-align:left;margin-top:7px}.file-map code{font-size:12px}.test-sequence{grid-template-columns:1fr}.test-sequence>div{padding:14px;display:grid;grid-template-columns:90px 1fr;gap:0 10px;align-items:center}.test-sequence b{font-size:18px;margin:3px 0}.test-sequence small{grid-column:2}.video-grid{grid-template-columns:1fr}.flow-notes b{display:block;min-width:0;margin-bottom:5px}.surface-comparison{gap:15px}.surface-box{padding:8px;gap:5px}.surface-box>span{font-size:12px;padding:12px 6px}.table-wrap th,.table-wrap td{padding:11px;font-size:14px}td code{font-size:12px}.deep-chapter{margin-bottom:60px}.level-transition{padding:50px 0}.level-transition>p{font-size:16px}.learning-route a{font-size:13px}.module-toolbar{font-size:12px;padding:14px;gap:10px}.props-map>div{gap:8px}.props-map code{font-size:12px}.mastery-check{padding:25px 20px}.mastery-check ol{font-size:16px}.learning-phases{max-width:450px}.idea-grid h4{font-size:21px}.api-shelf code{font-size:12px}.nested-model{padding:10px}.nested-model div{padding:12px}.nested-model span{font-size:12px}.nested-model b{font-size:15px}}
@media(max-width:500px){.lesson{grid-template-columns:minmax(0,1fr);gap:12px}.lesson-index{position:static}.compare-pair,.debug-grid,.idea-grid{grid-template-columns:1fr}.idea-grid>div:last-child{grid-column:auto}.surface-comparison{grid-template-columns:1fr}.chain-directions{padding:15px}.chain-directions p{font-size:13px}.chain-directions b{margin-right:8px}.lesson-code .card-top{align-items:flex-start}.lesson-code pre{font-size:12px;padding:15px;line-height:1.9}.copy-btn{font-size:12px;padding:5px 8px}.test-sequence>div{grid-template-columns:60px 1fr}.table-wrap table{min-width:540px}.video-label{font-size:13px}.module-toolbar{flex-direction:column;align-items:flex-start}.learning-phases span{font-size:11px}.term-note>b{font-size:14px}}
.chart-caption{font-size:12px;color:var(--muted);line-height:1.6;margin-top:8px}.source-screen{margin:27px 0 5px;padding:18px;border:1px solid var(--line);border-radius:9px;background:var(--panel)}.source-screen a{display:block}.source-screen img{display:block;width:100%;height:auto;border-radius:5px}.source-screen figcaption{font-size:15px;line-height:1.85;color:var(--muted);margin-top:17px}.source-screen figcaption b{display:block;color:var(--mint);font-size:14px;font-weight:500;margin-bottom:6px}.source-screen.portrait{max-width:740px;margin-left:auto;margin-right:auto}.manual-copy{width:100%;min-height:180px;background:var(--bg);border:1px solid var(--mint);border-radius:5px;color:var(--ink);padding:15px;font:14px/1.7 Consolas,monospace;resize:vertical;flex-basis:100%}.module-toolbar:has(.manual-copy){flex-wrap:wrap}
@media(max-width:850px){.chart-caption{font-size:11px;margin-top:5px}.source-screen{padding:12px}.source-screen figcaption{font-size:14px}.context-visual .result-note{margin-top:8px}.context-visual .mini-chart{margin-top:8px}}
@media(max-width:850px) and (max-height:650px){.story{display:block;padding-top:0}.visual-wrap{position:relative}.visual{position:relative;top:0;height:auto;min-height:330px;box-shadow:none}.beat{min-height:0;margin-top:32px;padding:15px 0;opacity:1}.story-text{padding-top:15px}}

/* Function-focused additions reuse the existing lesson rhythm. */
.mods-definition{margin-top:34px;max-width:100%;} .mods-definition p{max-width:85ch;}
.reference-line{font-size:13px!important;color:var(--muted);margin-top:18px;}
.adoption-steps{padding-left:24px;line-height:1.8;} .adoption-steps li{margin:14px 0;}
.reference-shelf{padding:90px 0;border-top:1px solid var(--line);} .reference-shelf h2{font-size:clamp(30px,4vw,50px);line-height:1.25;margin:20px 0 30px;}
.reference-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin-bottom:28px;}
.reference-grid a{display:flex;flex-direction:column;gap:10px;padding:24px;border:1px solid var(--line);border-radius:12px;text-decoration:none;background:var(--panel);} .reference-grid a:hover{border-color:var(--mint);}.reference-grid span{color:var(--muted);font-size:13px;line-height:1.7;}
.reference-shelf>p{color:var(--muted);max-width:80ch;line-height:1.8;}
@media(max-width:850px){.reference-grid{grid-template-columns:1fr;}.reference-shelf{padding:60px 0;}.mods-definition{margin-top:24px;}}

.section-infographic{margin:50px 0 32px;border:1px solid var(--line);background:#eeeae1;overflow:hidden;}
.infographic-heading{display:flex;align-items:center;gap:18px;padding:17px 22px;color:#273331;border-bottom:1px solid #27333125;line-height:1.5;}
.infographic-heading>span{font-size:12px;white-space:nowrap;color:#60716c;}.infographic-heading>b{font-size:15px;font-weight:600;}.infographic-heading>a{margin-left:auto;font-size:12px;white-space:nowrap;text-underline-offset:4px;}
.infographic-image-link{display:block;line-height:0;}.section-infographic img{display:block;width:100%;height:auto;aspect-ratio:4/3;object-fit:contain;background:#f2efe6;}
.section-infographic figcaption{padding:17px 22px;margin:0;color:#52615b;font-size:14px;line-height:1.75;border-top:1px solid #27333120;}
@media(max-width:850px){.section-infographic{margin:34px 0 26px;}.infographic-heading{gap:10px;padding:13px 15px;flex-wrap:wrap;}.infographic-heading>b{font-size:14px;flex-basis:calc(100% - 110px);}.infographic-heading>a{margin-left:0;}.section-infographic figcaption{font-size:13px;padding:14px 15px;}}