:root{--bg:#f5f6f8;--card:#fff;--soft:#f9fafb;--line:#e1e5eb;--line2:#edf0f4;--fg:#172033;--muted:#64748b;--accent:#2b4c7e;--accentsoft:#e8eef8;--gold:#ad8026;--goldsoft:#f8f0dd;--sidebar:#fff;--hover:#f0f3f8;--blue:#3c78aa;--green:#16835e;--red:#b34a4a;--shadow:0 14px 45px rgba(30,47,75,.045);color-scheme:light}
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var(--line);vertical-align:top;text-align:left}.fig-picker{display:flex;gap:5px;flex-wrap:wrap;margin-bottom:15px}.fig-picker button{border:1px solid var(--line);background:var(--card);border-radius:7px;padding:5px 9px;color:var(--fg);font-size:11px}.fig-picker button.selected{border-color:var(--gold);background:var(--goldsoft)}.badge{display:inline-block;padding:4px 8px;border-radius:6px;font-size:10px;font-weight:750;background:var(--accentsoft);color:var(--accent)}@media(max-width:1260px){.threecols{grid-template-columns:220px minmax(0,1fr)}.lesson-panel.glossary-right{grid-column:1/-1;position:static}.gallery{grid-template-columns:repeat(3,1fr)}}@media(max-width:980px){#app{grid-template-columns:1fr}.sidebar{display:none;position:fixed;top:0;left:0;width:280px;box-shadow:0 0 0 200vw rgba(0,0,0,.4)}.sidebar.open{display:flex}.mobile-menu{display:block}.topbar{min-height:66px}.cards{grid-template-columns:repeat(2,1fr)}.threecols{grid-template-columns:1fr}.lesson-panel{position:static}.lesson-panel.glossary-right{grid-column:auto}.step-list{grid-template-columns:repeat(2,1fr)}.hero{grid-template-columns:1fr 220px}.reader-wrap{grid-template-columns:1fr}.chapter-index{position:static;max-height:180px}.part-hero{grid-template-columns:1fr 140px}}@media(max-width:660px){#main{padding-top:24px}.topbar{padding:11px 15px;gap:8px}.breadcrumb{display:none}.hero,.part-hero{grid-template-columns:1fr}.hero-img{max-width:280px}.cards,.chapters{grid-template-columns:1fr}.strip{grid-template-columns:repeat(2,1fr)}.gallery{grid-template-columns:repeat(2,1fr)}.part-hero img{max-height:170px;width:230px}.top-actions{gap:5px}.seg button{padding:6px 7px;font-size:10px}.control-grid{grid-template-columns:1fr}.lesson-controls{flex-direction:column}.btn{width:100%}.title-xl{font-size:32px}.part-card{min-height:190px}}@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}

/* ===== Part I master lesson v1.1 ===== */
.p1-master{display:grid;gap:18px}.p1-head{display:flex;align-items:flex-start;justify-content:space-between;gap:24px;padding:4px 2px}.p1-head h1{font-size:32px;line-height:1.3;margin:6px 0 10px;letter-spacing:-.02em}.p1-head p{margin:0;color:var(--muted);line-height:1.8;max-width:900px}.p1-badge{min-width:78px;height:78px;border-radius:20px;border:1px solid var(--gold);background:var(--goldsoft);display:grid;place-items:center;color:var(--gold);font-weight:850;font-size:18px}.p1-map{display:grid;grid-template-columns:repeat(12,minmax(70px,1fr));gap:6px;overflow:auto;padding:4px 0 8px}.p1-map button{border:1px solid var(--line);background:var(--card);color:var(--muted);border-radius:10px;padding:10px 8px;min-height:68px;text-align:left;display:flex;flex-direction:column;gap:5px;cursor:pointer}.p1-map button b{font-size:10px;color:var(--gold)}.p1-map button span{font-size:10px;line-height:1.4}.p1-map button.active{border-color:var(--gold);background:var(--goldsoft);color:var(--fg);box-shadow:0 0 0 1px color-mix(in srgb,var(--gold) 20%,transparent)}.p1-map button.done{background:var(--accentsoft);color:var(--fg)}.p1-layout{display:grid;grid-template-columns:290px minmax(0,1fr) 260px;gap:16px;align-items:start}.p1-teacher,.p1-gloss{position:sticky;top:92px}.p1-teacher h2{font-size:20px;line-height:1.45;margin:7px 0 14px}.p1-explain{border-left:3px solid var(--gold);background:var(--goldsoft);border-radius:9px;padding:12px 13px;margin:10px 0}.p1-explain.second{border-left-color:var(--accent);background:var(--accentsoft)}.p1-explain b{font-size:11px}.p1-explain p{font-size:12px;line-height:1.85;margin:7px 0 0}.p1-source{display:block;margin-top:14px;color:var(--accent);font-size:12px;font-weight:750;text-decoration:none}.p1-source:hover{text-decoration:underline}.p1-stage{min-width:0}.p1-stage h2{font-size:21px;margin:5px 0 12px}.p1-canvas{min-height:320px}.p1-canvas svg{max-height:390px}.p1-click{cursor:pointer}.p1-click:hover{filter:brightness(1.1)}.p1-formula-card{margin-top:14px;padding:15px;border:1px solid var(--line);background:var(--soft);border-radius:12px}.p1-formula-card>p{font-size:11px;line-height:1.75;color:var(--muted);margin:8px 0 0}.p1-formula{font-size:1.12rem;overflow:auto;padding:10px 4px;min-height:48px;display:flex;align-items:center;justify-content:center}.p1-formula mjx-container{margin:.4em 0!important}.p1-term{border:1px solid var(--line);border-radius:10px;background:var(--soft);padding:11px;margin:10px 0}.p1-term>strong{font-size:13px}.p1-term p,.p1-term details{font-size:11px;line-height:1.8}.p1-term p{margin:6px 0}.p1-term summary{cursor:pointer;color:var(--accent);font-weight:750}.p1-check{margin-top:14px;border:1px dashed var(--gold);background:var(--goldsoft);border-radius:12px;padding:14px}.p1-check>strong{font-size:12px}.p1-check>p{font-size:13px;line-height:1.7}.p1-static-control{font-size:12px;line-height:1.8;color:var(--muted);padding:4px}.p1-source-strip{display:flex;justify-content:space-between;gap:18px;align-items:center}.p1-source-strip p{margin:5px 0 0;color:var(--muted);font-size:12px;line-height:1.75}.original mjx-container[display="true"]{overflow-x:auto;overflow-y:hidden;padding:6px 0}.original .math-block{font-size:1.03rem;min-height:44px;display:block}.original .math-inline{font-size:inherit;padding:0;background:transparent}.math-block .tex-source{white-space:pre-wrap}.math-render-check{font-family:Georgia,"Times New Roman",serif}.canvas text{user-select:none}
@media(max-width:1500px){.p1-layout{grid-template-columns:250px minmax(0,1fr)}.p1-gloss{grid-column:1/-1;position:static;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.p1-gloss>h3,.p1-gloss>.kicker,.p1-gloss>p,.p1-gloss>.notice{grid-column:1/-1}.p1-term{margin:0}}
@media(max-width:1100px){.p1-layout{grid-template-columns:1fr}.p1-teacher,.p1-gloss{position:static}.p1-map{grid-template-columns:repeat(6,minmax(95px,1fr))}.p1-teacher{display:grid;grid-template-columns:1fr 1fr;gap:10px}.p1-teacher>.kicker,.p1-teacher>h2,.p1-teacher>.course-note,.p1-teacher>.p1-source{grid-column:1/-1}.p1-explain{margin:0}.p1-gloss{grid-template-columns:1fr 1fr}}
@media(max-width:700px){.p1-head{display:block}.p1-badge{width:68px;height:58px;border-radius:14px;margin-top:12px}.p1-head h1{font-size:27px}.p1-map{grid-template-columns:repeat(12,100px)}.p1-teacher,.p1-gloss{display:block}.p1-source-strip{display:block}.p1-source-strip .btn{margin-top:12px}.p1-canvas{min-height:250px}.p1-formula{font-size:1rem}.p1-layout .panel{padding:15px}}
.p1-symbols{display:grid;grid-template-columns:repeat(auto-fit,minmax(145px,1fr));gap:8px;margin:8px 0 4px}.p1-symbols>div{border:1px solid var(--line);background:var(--card);border-radius:9px;padding:9px}.p1-symbols span{display:block;font-weight:800;color:var(--gold);min-height:28px}.p1-symbols small{display:block;color:var(--muted);line-height:1.55}.p1-extension{display:flex;align-items:center;gap:6px;flex-wrap:wrap}.p1-extension>span{font-size:10px;color:var(--muted);margin-right:3px}.p1-extension a{width:27px;height:27px;display:grid;place-items:center;border-radius:7px;border:1px solid var(--line);color:var(--fg);text-decoration:none;font-size:10px;background:var(--card)}.p1-extension a:hover{border-color:var(--gold);color:var(--gold)}

/* Part II master lesson v1.2 */
.p2-map{display:grid;grid-template-columns:repeat(14,minmax(74px,1fr));gap:6px;overflow:auto;padding:4px 0 8px}.p2-map button{border:1px solid var(--line);background:var(--card);color:var(--muted);border-radius:10px;padding:10px 8px;min-height:68px;text-align:left;display:flex;flex-direction:column;gap:5px;cursor:pointer}.p2-map button b{font-size:10px;color:var(--gold)}.p2-map button span{font-size:10px;line-height:1.4}.p2-map button.active{border-color:var(--gold);background:var(--goldsoft);color:var(--fg);box-shadow:0 0 0 1px color-mix(in srgb,var(--gold) 20%,transparent)}.p2-map button.done{background:var(--accentsoft);color:var(--fg)}.p2-master .p1-canvas svg{max-height:420px}.p2-master select{width:100%;border:1px solid var(--line);background:var(--card);color:var(--fg);border-radius:8px;padding:9px 10px}.p2-master .control+.control{margin-top:10px}@media(max-width:1100px){.p2-map{grid-template-columns:repeat(7,minmax(95px,1fr))}}@media(max-width:700px){.p2-map{grid-template-columns:repeat(14,105px)}}
.p2-bookfig{margin-top:12px;border-top:1px solid var(--line);padding-top:10px}.p2-bookfig summary{cursor:pointer;color:var(--accent);font-size:11px;font-weight:750}.p2-bookfig-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:10px;margin-top:10px}.p2-bookfig figure{margin:0;border:1px solid var(--line);background:var(--card);border-radius:10px;overflow:hidden}.p2-bookfig img{display:block;width:100%;height:auto}.p2-bookfig figcaption{font-size:10px;color:var(--muted);padding:6px 8px}
/* v1.3 Part III master lesson */
.p3-map{grid-template-columns:repeat(16,minmax(74px,1fr))}
.p3-master .p1-canvas svg{max-height:430px}
.p3-master select{width:100%;border:1px solid var(--line);background:var(--card);color:var(--fg);border-radius:8px;padding:9px 10px}
.p3-master .control{display:block}
.p3-master .control>span{display:block;color:var(--muted);font-size:11px;margin-bottom:7px}
.p3-master .control input[type=range]{width:100%;accent-color:var(--gold)}
.p3-master .control+.control{margin-top:10px}
@media(max-width:1100px){.p3-map{grid-template-columns:repeat(8,minmax(95px,1fr))}}
@media(max-width:700px){.p3-map{grid-template-columns:repeat(16,105px)}}

/* v1.4 Part IV */
.p4-map{grid-template-columns:repeat(18,minmax(78px,1fr))}.p4-master .p1-canvas svg{max-height:440px}.p4-master select{width:100%;border:1px solid var(--line);background:var(--card);color:var(--fg);border-radius:8px;padding:9px 10px}@media(max-width:1100px){.p4-map{grid-template-columns:repeat(9,minmax(95px,1fr))}}@media(max-width:700px){.p4-map{grid-template-columns:repeat(18,108px)}}

.p5-map{grid-template-columns:repeat(20,minmax(76px,1fr))}.p5-master .p1-canvas svg{max-height:440px}.p5-master select{width:100%;border:1px solid var(--line);background:var(--card);color:var(--fg);border-radius:8px;padding:9px 10px}@media(max-width:1100px){.p5-map{grid-template-columns:repeat(10,minmax(92px,1fr))}}@media(max-width:700px){.p5-map{grid-template-columns:repeat(20,108px)}}

/* v1.6 Part VI */
.p6-map{grid-template-columns:repeat(22,minmax(76px,1fr))}.p6-master .p1-canvas svg{max-height:440px}.p6-master select{width:100%;border:1px solid var(--line);background:var(--card);color:var(--fg);border-radius:8px;padding:9px 10px}.p6-master .control{display:block}.p6-master .control>span{display:block;color:var(--muted);font-size:11px;margin-bottom:7px}.p6-master .control input[type=range]{width:100%;accent-color:var(--gold)}.p6-master .control+.control{margin-top:10px}@media(max-width:1100px){.p6-map{grid-template-columns:repeat(11,minmax(92px,1fr))}}@media(max-width:700px){.p6-map{grid-template-columns:repeat(22,108px)}}

/* ===== v1.8 Learning center / school integration ===== */
.progress-chip{display:inline-flex;align-items:center;justify-content:center;min-width:78px;padding:7px 10px;border:1px solid var(--line);border-radius:9px;background:var(--soft);color:var(--muted);font-size:10px;font-weight:800;text-decoration:none}.progress-chip:hover{border-color:var(--gold);color:var(--gold)}
.school-hero{display:grid;grid-template-columns:minmax(0,1fr) 230px;gap:28px;align-items:center;padding:18px 0 8px}.school-score{display:grid;grid-template-columns:auto 1fr;gap:9px 12px;align-items:center}.school-score strong{font-size:29px;letter-spacing:-.04em;color:var(--gold)}.school-score span{font-size:11px;line-height:1.55;color:var(--muted)}
.school-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.school-tile{display:block;min-height:185px;padding:20px;border:1px solid var(--line);background:var(--card);border-radius:14px;color:var(--fg);text-decoration:none;box-shadow:var(--shadow);transition:.18s transform,.18s border-color}.school-tile:hover{transform:translateY(-3px);border-color:var(--gold)}.school-tile>b{font-size:11px;color:var(--gold);letter-spacing:.12em}.school-tile h3{font-size:17px;margin:18px 0 8px}.school-tile p{font-size:12px;line-height:1.8;color:var(--muted);margin:0}
.knowledge-scroll{overflow:auto;padding:12px;margin-top:20px}.knowledge-svg{min-width:1180px;width:100%;height:auto}.k-edges line{stroke:var(--line);stroke-width:1.5}.k-node rect{fill:var(--card);stroke:var(--line);stroke-width:1.2}.k-node:hover rect{stroke:var(--gold);stroke-width:2}.k-node.mastered rect{fill:var(--goldsoft);stroke:var(--gold)}.k-node text{fill:var(--fg);font-size:10px;font-weight:750}.k-node .k-sub{fill:var(--muted);font-size:9px;font-weight:500}.concept-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:13px;margin-top:18px}.concept-card{box-shadow:none}.concept-card.mastered{border-color:var(--gold);background:linear-gradient(180deg,var(--card),var(--goldsoft))}.concept-card h3{margin-top:13px}.concept-card p{font-size:12px;line-height:1.8}.concept-card details{border-top:1px solid var(--line2);padding-top:9px}.concept-card summary{cursor:pointer;color:var(--accent);font-size:11px;font-weight:750}.mini-check{border:1px solid var(--line);background:var(--soft);color:var(--muted);padding:6px 9px;border-radius:8px;font-size:10px}.mini-check:hover{border-color:var(--gold);color:var(--gold)}
.routes-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-top:22px}.route-card{min-width:0}.progress-ring{display:grid;place-items:center;width:48px;height:48px;border:2px solid var(--gold);border-radius:50%;color:var(--gold);font-size:11px;font-weight:850;flex:0 0 auto}.route-steps{display:grid;gap:8px;margin-top:15px}.route-step{display:grid;grid-template-columns:38px minmax(0,1fr);gap:10px;align-items:start;border:1px solid var(--line2);border-radius:10px;padding:10px;background:var(--soft)}.route-step.done{border-color:color-mix(in srgb,var(--green) 55%,var(--line));background:color-mix(in srgb,var(--green) 8%,var(--card))}.route-check{width:32px;height:32px;border-radius:50%;border:1px solid var(--line);background:var(--card);color:var(--gold);font-size:10px;font-weight:850}.route-step.done .route-check{border-color:var(--green);color:var(--green)}.route-step a{text-decoration:none;color:var(--fg)}.route-step strong{font-size:12px}.route-step p{font-size:10px;line-height:1.6;color:var(--muted);margin:4px 0 0}
.topic-timeline{max-width:880px;margin-top:22px;display:grid;gap:0}.topic-stop{display:grid;grid-template-columns:46px minmax(0,1fr);gap:14px;position:relative;padding:0 0 18px}.topic-stop:before{content:"";position:absolute;left:22px;top:38px;bottom:0;width:1px;background:var(--line)}.topic-stop:last-child:before{display:none}.topic-stop>span{width:44px;height:44px;border:1px solid var(--gold);border-radius:50%;display:grid;place-items:center;background:var(--card);color:var(--gold);font-size:10px;font-weight:800;z-index:1}.topic-stop>div{border:1px solid var(--line);border-radius:12px;background:var(--card);padding:13px 15px}.topic-stop b{font-size:13px}.topic-stop p{font-size:11px;color:var(--muted);line-height:1.7;margin:6px 0}.topic-stop a{font-size:11px;font-weight:750;text-decoration:none}
.revisit-list{display:grid;gap:14px;margin-top:20px}.revisit-card{display:grid;grid-template-columns:minmax(0,1fr) minmax(310px,.8fr);gap:20px;align-items:center}.revisit-card h3{font-size:14px;line-height:1.7;margin:10px 0 5px}.revisit-track{display:flex;align-items:center;justify-content:flex-end;gap:5px;overflow:auto;padding:5px}.revisit-track>a{min-width:62px;text-align:center;border:1px solid var(--line);background:var(--soft);border-radius:10px;padding:8px;text-decoration:none;color:var(--fg)}.revisit-track>a:hover{border-color:var(--gold)}.revisit-track b{display:block;color:var(--gold);font-size:11px}.revisit-track span{display:block;color:var(--muted);font-size:9px;margin-top:3px}.revisit-track i{font-style:normal;color:var(--muted)}
.progress-lessons{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}.progress-lesson{display:grid;grid-template-columns:42px minmax(0,1fr) auto;gap:10px;align-items:center;border:1px solid var(--line);background:var(--card);border-radius:11px;padding:12px;color:var(--fg);text-decoration:none}.progress-lesson.done{border-color:color-mix(in srgb,var(--green) 45%,var(--line));background:color-mix(in srgb,var(--green) 6%,var(--card))}.progress-lesson b{color:var(--gold);font-size:11px}.progress-lesson span{font-size:11px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.progress-lesson em{font-size:9px;font-style:normal;color:var(--muted)}.progress-lesson.done em{color:var(--green)}
@media(max-width:1050px){.school-grid,.concept-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.routes-grid{grid-template-columns:1fr}.revisit-card{grid-template-columns:1fr}.revisit-track{justify-content:flex-start}}
@media(max-width:700px){.progress-chip{display:none}.school-hero{grid-template-columns:1fr}.school-score{max-width:330px}.school-grid,.concept-grid,.progress-lessons{grid-template-columns:1fr}.school-tile{min-height:145px}.knowledge-scroll{padding:6px}.revisit-track{min-width:0}.route-card{padding:15px}}
.lesson-bridge{margin-top:22px;display:flex;align-items:center;justify-content:space-between;gap:20px}.lesson-bridge h3{margin:4px 0 7px}.lesson-bridge p{font-size:11px;color:var(--muted);line-height:1.7;margin:0;max-width:650px}.lesson-bridge .row{justify-content:flex-end}@media(max-width:850px){.lesson-bridge{display:block}.lesson-bridge .row{margin-top:13px;justify-content:flex-start}.lesson-bridge .btn{width:auto}}@media(max-width:600px){.lesson-bridge .btn{width:100%}}

/* ===== v1.9 Shared public mathematics laboratories ===== */
.lab-home-hero,.lab-hero{display:grid;grid-template-columns:minmax(0,1fr) 180px;gap:28px;align-items:center;padding:18px 0 26px}.lab-home-mark,.lab-badge{width:138px;height:138px;margin-left:auto;border:1px solid var(--gold);border-radius:32px;display:grid;place-items:center;background:linear-gradient(145deg,var(--goldsoft),var(--card));color:var(--gold);font-size:46px;font-weight:850;box-shadow:var(--shadow)}.lab-home-mark{font-size:58px}.lab-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin:18px 0 28px}.lab-card{position:relative;display:block;min-height:220px;border:1px solid var(--line);background:var(--card);border-radius:16px;padding:24px;color:var(--fg);text-decoration:none;box-shadow:var(--shadow);transition:.18s transform,.18s border-color}.lab-card:hover{transform:translateY(-3px);border-color:var(--gold)}.lab-card .lab-icon{position:absolute;right:22px;top:20px;width:42px;height:42px;border:1px solid var(--line);border-radius:12px;display:grid;place-items:center;color:var(--gold);background:var(--soft);font-size:20px}.lab-card>b{font-size:10px;letter-spacing:.12em;color:var(--gold)}.lab-card h3{font-size:18px;margin:30px 54px 9px 0}.lab-card p{font-size:12px;line-height:1.8;color:var(--muted);min-height:66px}.lab-card>span:last-child{font-size:11px;font-weight:800;color:var(--accent)}
.lab-layout{display:grid;grid-template-columns:minmax(250px,.68fr) minmax(0,1.7fr);gap:16px;align-items:start;margin:10px 0 18px}.lab-teacher{position:sticky;top:78px}.lab-teacher h3{font-size:14px;margin:18px 0 7px}.lab-teacher p{font-size:12px;line-height:1.8;color:var(--muted)}.lab-formula{overflow:auto;margin:16px 0;padding:11px;border:1px solid var(--line2);border-radius:10px;background:var(--soft)}.lab-stage h2{font-size:18px}.lab-scope{margin:16px 0}.lab-controls{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:18px 0}.lab-controls.three{grid-template-columns:repeat(3,minmax(0,1fr))}.lab-controls label{display:block;border:1px solid var(--line2);background:var(--soft);border-radius:10px;padding:11px}.lab-controls label>span{display:block;font-size:10px;color:var(--muted);margin-bottom:8px}.lab-controls input[type=range],.lab-controls input[type=number],.lab-controls select{width:100%;box-sizing:border-box}.lab-controls input[type=range]{accent-color:var(--gold)}.lab-controls input[type=number],.lab-controls select{border:1px solid var(--line);background:var(--card);color:var(--fg);border-radius:8px;padding:8px}.lab-tools{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0 10px}.snapshot-row{display:flex;flex-wrap:wrap;gap:6px;margin:10px 0 20px}.snapshot-chip{border:1px solid var(--line);background:var(--soft);color:var(--muted);border-radius:999px;padding:6px 9px;font-size:9px;cursor:pointer}.snapshot-chip:hover{border-color:var(--gold);color:var(--gold)}
.spectrum-grid{display:grid;grid-template-columns:repeat(9,minmax(0,1fr));gap:6px;margin:14px 0}.spectrum-cell{position:relative;min-height:58px;border:1px solid var(--line2);border-radius:9px;background:var(--soft);color:var(--muted);padding:6px;display:flex;flex-direction:column;align-items:center;justify-content:center}.spectrum-cell b{font-size:10px;color:var(--fg)}.spectrum-cell span{font-size:10px}.spectrum-cell i{position:absolute;right:5px;top:3px;color:var(--gold);font-size:8px}.spectrum-cell.atom{cursor:pointer;border-color:color-mix(in srgb,var(--gold) 40%,var(--line))}.spectrum-cell.ray{background:color-mix(in srgb,var(--accent) 11%,var(--card));box-shadow:inset 0 -3px 0 color-mix(in srgb,var(--accent) 65%,transparent)}.spectrum-cell.selected{border-color:var(--gold);box-shadow:0 0 0 2px var(--goldsoft)}.spectrum-cell:disabled{opacity:.86}.lab-legend{display:flex;flex-wrap:wrap;gap:14px;font-size:10px;color:var(--muted)}.dot{display:inline-block;width:8px;height:8px;border-radius:50%;margin-right:5px}.atom-dot{background:var(--gold)}.ray-dot{background:var(--accent)}
.horizon-line{display:grid;grid-template-columns:28px 1fr 64px;gap:9px;align-items:center;font-size:10px;color:var(--muted);margin:12px 0 18px}.horizon-line i{position:relative;height:5px;border-radius:5px;background:var(--line)}.horizon-line i:after{content:"";position:absolute;left:0;top:0;height:100%;width:var(--pct);border-radius:inherit;background:var(--gold)}.horizon-grid{display:grid;grid-template-columns:repeat(9,minmax(0,1fr));gap:6px}.horizon-cell{min-height:48px;border:1px solid var(--line2);background:var(--soft);color:var(--fg);border-radius:9px;padding:4px;cursor:pointer}.horizon-cell b,.horizon-cell span{display:block}.horizon-cell b{font-size:10px}.horizon-cell span{font-size:8px;color:var(--muted);margin-top:3px}.horizon-cell.prime{border-color:color-mix(in srgb,var(--gold) 38%,var(--line))}.horizon-cell.prime span{color:var(--gold)}.horizon-cell.selected{box-shadow:0 0 0 2px var(--accentsoft);border-color:var(--accent)}
.relation-plane{border:1px solid var(--line2);background:var(--soft);border-radius:12px;padding:6px;overflow:auto}.relation-plane svg{display:block;width:100%;height:auto;min-width:560px}.pair-list{display:flex;flex-wrap:wrap;gap:6px}.pair-list span{border:1px solid var(--line2);background:var(--soft);border-radius:999px;padding:5px 8px;font-size:9px;color:var(--muted)}
.crt-stack{display:grid;gap:9px;margin:16px 0}.crt-level{border:1px solid var(--line2);border-radius:11px;padding:12px;background:var(--soft)}.crt-level>b{display:block;font-size:11px;margin-bottom:8px}.crt-level div{display:flex;gap:8px;flex-wrap:wrap}.crt-level span{font-size:10px;border-radius:7px;padding:5px 7px}.crt-level .forbid{background:color-mix(in srgb,#c85a5a 11%,var(--card));color:#b35757}.crt-level .allow{background:color-mix(in srgb,var(--accent) 11%,var(--card));color:var(--accent)}.crt-survivors{border:1px solid var(--gold);border-radius:12px;padding:13px;background:var(--goldsoft)}.crt-survivors>b{font-size:11px}.crt-survivors>div{display:flex;flex-wrap:wrap;gap:5px;margin-top:8px}.crt-survivors span{min-width:26px;text-align:center;border:1px solid color-mix(in srgb,var(--gold) 35%,var(--line));background:var(--card);border-radius:6px;padding:4px;font-size:9px}
@media(max-width:1050px){.lab-layout{grid-template-columns:1fr}.lab-teacher{position:static}.spectrum-grid,.horizon-grid{grid-template-columns:repeat(7,minmax(0,1fr))}}
@media(max-width:700px){.lab-home-hero,.lab-hero{grid-template-columns:1fr}.lab-home-mark,.lab-badge{margin:0;width:82px;height:82px;border-radius:22px;font-size:28px}.lab-grid{grid-template-columns:1fr}.lab-card{min-height:175px}.lab-controls,.lab-controls.three{grid-template-columns:1fr}.spectrum-grid,.horizon-grid{grid-template-columns:repeat(5,minmax(0,1fr))}.lab-tools .btn{width:100%}}
/* ===== v2.0 Advanced shared mathematics laboratories ===== */
.lab-section-title{display:flex;align-items:end;gap:12px;margin:28px 0 12px}.lab-section-title span{font-size:11px;color:var(--gold);font-weight:800;letter-spacing:.12em}.lab-section-title h2{font-size:18px;margin:0}.ledger-flow{display:grid;grid-template-columns:1fr auto 1fr auto 1fr;gap:10px;align-items:center;margin:18px 0}.ledger-flow>div{border:1px solid var(--line);background:var(--soft);border-radius:12px;padding:18px;text-align:center}.ledger-flow b{display:block;font-size:30px;color:var(--gold)}.ledger-flow span{font-size:11px;color:var(--muted)}.ledger-flow i{font-style:normal;color:var(--muted);font-weight:800;font-size:18px}.lab-detail{margin-top:14px;border:1px solid var(--line);border-radius:10px;background:var(--soft);padding:10px 12px}.lab-detail summary{cursor:pointer;color:var(--accent);font-size:11px;font-weight:800}.table-scroll{overflow:auto;margin-top:10px}.lab-table{width:100%;border-collapse:collapse;font-size:11px;min-width:580px}.lab-table th,.lab-table td{padding:9px 10px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}.lab-table th{color:var(--muted);font-size:10px;letter-spacing:.04em}.lab-table td small{display:block;color:var(--muted);margin-top:3px}.method-table tr.method-primary{background:color-mix(in srgb,var(--gold) 7%,transparent)}.method-table tr.method-related{background:color-mix(in srgb,var(--accent) 5%,transparent)}.method-legend{display:flex;gap:8px;flex-wrap:wrap;margin:8px 0 12px}.capability{display:inline-block;border:1px solid var(--line);border-radius:999px;padding:4px 8px;font-size:9px;font-weight:800}.capability.primary{border-color:var(--gold);color:var(--gold);background:var(--goldsoft)}.capability.related{border-color:var(--accent);color:var(--accent);background:var(--accentsoft)}.capability.other{color:var(--muted);background:var(--soft)}.v-ladder{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:6px;margin:16px 0}.v-step{border:1px solid var(--line);background:var(--soft);color:var(--muted);border-radius:10px;min-height:78px;padding:8px;cursor:pointer;text-align:left}.v-step b{display:block;color:var(--fg);font-size:13px;margin-bottom:6px}.v-step span{font-size:9px;line-height:1.5}.v-step.attained{border-bottom:3px solid var(--green)}.v-step.selected{border-color:var(--gold);box-shadow:0 0 0 2px var(--goldsoft);color:var(--fg)}.verify-explain{border:1px solid var(--line);background:var(--soft);border-radius:12px;padding:14px;margin:10px 0}.verify-explain p{font-size:11px;color:var(--muted);line-height:1.8}.json-view{white-space:pre-wrap;overflow:auto;max-height:360px;border:1px solid var(--line);background:var(--soft);color:var(--fg);border-radius:10px;padding:14px;font:11px/1.65 ui-monospace,SFMono-Regular,Consolas,monospace}.rsl-editor{width:100%;min-height:310px;resize:vertical;box-sizing:border-box;border:1px solid var(--line);background:var(--soft);color:var(--fg);border-radius:10px;padding:14px;font:11px/1.65 ui-monospace,SFMono-Regular,Consolas,monospace;tab-size:2}.rsl-editor:focus{outline:2px solid var(--goldsoft);border-color:var(--gold)}
@media(max-width:900px){.v-ladder{grid-template-columns:repeat(3,minmax(0,1fr))}.ledger-flow{grid-template-columns:1fr}.ledger-flow i{transform:rotate(90deg);justify-self:center}}
@media(max-width:540px){.v-ladder{grid-template-columns:repeat(2,minmax(0,1fr))}}

/* Batch 12 · chapter-level teaching enhancer v2.1 */
.chapter-teach{margin:18px 0 28px;display:grid;gap:14px}.chapter-teach-head{display:flex;align-items:flex-start;justify-content:space-between;gap:18px;padding:20px;border:1px solid var(--line);border-radius:14px;background:var(--card);box-shadow:var(--shadow)}.chapter-teach-head h2{margin:0;font-size:21px}.chapter-teach-head p{margin:9px 0 0;line-height:1.85;color:var(--muted);max-width:920px}.chapter-curated .chapter-teach-head{border-color:color-mix(in srgb,var(--gold) 72%,var(--line));background:linear-gradient(135deg,var(--goldsoft),var(--card) 46%)}.chapter-teach-grid{display:grid;grid-template-columns:1.05fr 1fr 1fr;gap:14px;align-items:start}.chapter-teacher-card p{font-size:12px;line-height:1.85}.chapter-check{margin-top:14px;border:1px dashed var(--gold);background:var(--goldsoft);padding:13px;border-radius:10px}.chapter-check>b{font-size:11px;color:var(--gold)}.chapter-check p{font-size:13px;color:var(--fg)}.chapter-check summary{cursor:pointer;color:var(--accent);font-weight:750;font-size:12px}.chapter-check details p{font-size:12px}.chapter-prereq{margin-top:14px;padding-top:12px;border-top:1px solid var(--line);display:flex;gap:7px;align-items:center;flex-wrap:wrap;font-size:11px}.chapter-prereq a{border:1px solid var(--line);border-radius:999px;padding:5px 8px;text-decoration:none;color:var(--accent);background:var(--soft)}.chapter-formula{display:grid;grid-template-columns:28px minmax(0,1fr);align-items:start;gap:8px;border-bottom:1px solid var(--line);padding:8px 0}.chapter-formula:last-child{border-bottom:0}.chapter-formula>span{font-size:9px;color:var(--gold);font-weight:850;padding-top:10px}.chapter-formula>div{overflow:auto;min-width:0}.chapter-formula mjx-container[display="true"]{margin:.35em 0!important}.chapter-term{border:1px solid var(--line);border-radius:10px;background:var(--soft);padding:11px;margin:8px 0}.chapter-term>strong{font-size:12px}.chapter-term p,.chapter-term details{font-size:11px;line-height:1.75}.chapter-term p{margin:7px 0}.chapter-term summary{cursor:pointer;color:var(--accent);font-weight:750}.chapter-resource-row{display:grid;grid-template-columns:1.15fr .85fr;gap:14px}.chapter-figs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}.chapter-figs a{border:1px solid var(--line);border-radius:9px;padding:7px;text-decoration:none;color:var(--fg);background:var(--soft)}.chapter-figs img{width:100%;height:105px;object-fit:contain;background:#fff;border-radius:6px}.chapter-figs span{display:block;font-size:10px;line-height:1.45;color:var(--muted);margin-top:5px}.chapter-lab-links{display:flex;gap:7px;flex-wrap:wrap}.chapter-path{display:flex;justify-content:space-between;align-items:center;gap:18px}.chapter-path p{margin:5px 0 0}.chapter-link{position:relative}.chapter-link em{font-style:normal;font-size:9px;padding:2px 5px;border:1px solid var(--gold);border-radius:99px;color:var(--gold);margin-left:auto}.chapter-link i{font-style:normal;color:var(--green);font-weight:850}.chapter-link[data-deep="true"]{border-color:color-mix(in srgb,var(--gold) 55%,var(--line))}.chapter-link[data-done="true"]{background:var(--accentsoft)}.chapter-hub-hero{display:grid;grid-template-columns:minmax(0,1fr) 140px;gap:28px;align-items:center}.chapter-hub-mark{width:130px;height:130px;border-radius:30px;display:grid;place-items:center;border:1px solid var(--gold);background:var(--goldsoft);color:var(--gold);font-size:34px;font-weight:900;letter-spacing:-.05em}.chapter-deep-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.chapter-deep-card{display:block;text-decoration:none;color:var(--fg);border:1px solid var(--line);background:var(--card);border-radius:13px;padding:17px;box-shadow:var(--shadow)}.chapter-deep-card:hover{border-color:var(--gold);transform:translateY(-2px)}.chapter-deep-card>span{font-size:10px;color:var(--gold);font-weight:850;letter-spacing:.08em}.chapter-deep-card h3{font-size:15px;line-height:1.5;margin:8px 0}.chapter-deep-card p{font-size:11px;line-height:1.75;color:var(--muted);margin:0 0 10px}.chapter-deep-card em{font-style:normal;color:var(--accent);font-size:11px;font-weight:750}.chapter-deep-card.done{background:var(--accentsoft);border-color:var(--green)}.school-score{display:grid;grid-template-columns:auto 1fr;gap:5px 13px;min-width:230px}.school-score strong{font-size:25px;color:var(--gold)}.school-score span{font-size:10px;color:var(--muted);align-self:center}
@media(max-width:1180px){.chapter-teach-grid{grid-template-columns:1fr 1fr}.chapter-teach-grid>.panel:last-child{grid-column:1/-1}.chapter-resource-row{grid-template-columns:1fr}.chapter-deep-grid{grid-template-columns:1fr}}
@media(max-width:760px){.chapter-teach-head,.chapter-path{display:block}.chapter-teach-head .btn,.chapter-path .row{margin-top:12px}.chapter-teach-grid{grid-template-columns:1fr}.chapter-teach-grid>.panel:last-child{grid-column:auto}.chapter-figs{grid-template-columns:1fr 1fr}.chapter-hub-hero{grid-template-columns:1fr}.chapter-hub-mark{width:96px;height:72px;border-radius:18px}.chapter-deep-grid{grid-template-columns:1fr}}

/* Batch 13 · second deep-dive set v2.2 */
.teacher-five{border:1px solid color-mix(in srgb,var(--gold) 62%,var(--line));background:linear-gradient(145deg,var(--goldsoft),var(--card) 42%);border-radius:14px;padding:16px;box-shadow:var(--shadow)}
.teacher-five-head{display:flex;align-items:end;gap:18px;justify-content:space-between;margin-bottom:12px}.teacher-five-head h3{margin:2px 0;font-size:18px}.teacher-five-head p:last-child{max-width:720px;color:var(--muted);font-size:11px;line-height:1.7;margin:0}.teacher-five-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:9px}.teacher-five-grid article{min-width:0;border:1px solid var(--line);background:color-mix(in srgb,var(--card) 90%,transparent);border-radius:11px;padding:12px}.teacher-five-grid article>b{display:block;color:var(--gold);font-size:10px;letter-spacing:.04em;margin-bottom:8px}.teacher-five-grid article p{font-size:11px;line-height:1.75;color:var(--muted);margin:0}.teacher-five-grid details{margin-top:8px;border-top:1px solid var(--line);padding-top:7px}.teacher-five-grid summary{cursor:pointer;color:var(--accent);font-size:10px;font-weight:800}.teacher-five-grid details p{margin-top:7px;color:var(--fg)}.formula-birth-card{grid-column:span 2}.formula-birth-card details{background:var(--soft);border:1px solid var(--line);border-radius:8px;padding:7px 8px;margin-top:7px}.formula-birth-card details[open]{border-color:color-mix(in srgb,var(--gold) 52%,var(--line))}.birth-formula{overflow:auto;min-width:0}.birth-formula mjx-container[display="true"]{margin:.35em 0!important}.trap-card{border-color:color-mix(in srgb,#d97706 45%,var(--line))!important}.predict-card{border-color:color-mix(in srgb,var(--accent) 45%,var(--line))!important}.lab-task-card{border-color:color-mix(in srgb,var(--green) 45%,var(--line))!important}.lab-task-card .btn{margin-top:10px;width:100%;box-sizing:border-box;text-align:center}.chapter-curated:has(.teacher-five) .chapter-teach-head{box-shadow:0 0 0 1px color-mix(in srgb,var(--gold) 28%,transparent),var(--shadow)}
@media(max-width:1180px){.teacher-five-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.formula-birth-card{grid-column:span 2}.teacher-five-grid article:last-child{grid-column:1/-1}}
@media(max-width:720px){.teacher-five-head{display:block}.teacher-five-head p:last-child{margin-top:8px}.teacher-five-grid{grid-template-columns:1fr}.formula-birth-card,.teacher-five-grid article:last-child{grid-column:auto}}
\n\n/* Batch 14 · third deep-dive set v2.3 */
.teacher-seven{border:1px solid color-mix(in srgb,var(--accent) 45%,var(--gold) 35%,var(--line));background:linear-gradient(145deg,var(--goldsoft),var(--accentsoft) 38%,var(--card) 78%);border-radius:14px;padding:16px;box-shadow:var(--shadow)}
.teacher-seven-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:9px}.teacher-seven-grid article{min-width:0;border:1px solid var(--line);background:color-mix(in srgb,var(--card) 92%,transparent);border-radius:11px;padding:12px}.teacher-seven-grid article>b{display:block;color:var(--gold);font-size:10px;letter-spacing:.04em;margin-bottom:8px}.teacher-seven-grid article p{font-size:11px;line-height:1.75;color:var(--muted);margin:0}.teacher-seven-grid details{margin-top:8px;border-top:1px solid var(--line);padding-top:7px}.teacher-seven-grid summary{cursor:pointer;color:var(--accent);font-size:10px;font-weight:800}.teacher-seven-grid details p{margin-top:7px;color:var(--fg)}.teacher-seven-grid .formula-birth-card{grid-column:span 2}.wrong-path-card{border-color:color-mix(in srgb,#dc2626 45%,var(--line))!important;background:color-mix(in srgb,#dc2626 5%,var(--card))!important}.parameter-card{border-color:color-mix(in srgb,#7c3aed 42%,var(--line))!important}.teacher-seven .lab-task-card{border-color:color-mix(in srgb,var(--green) 50%,var(--line))!important}.teacher-seven .lab-task-card .btn{margin-top:10px;width:100%;box-sizing:border-box;text-align:center}
@media(max-width:1180px){.teacher-seven-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.teacher-seven-grid .formula-birth-card{grid-column:span 2}}
@media(max-width:720px){.teacher-seven-grid{grid-template-columns:1fr}.teacher-seven-grid .formula-birth-card{grid-column:auto}}

/* Batch 15 · fourth deep-dive set v2.4 */
.teacher-b4{border-top:1px solid color-mix(in srgb,var(--gold) 45%,transparent)}
.teacher-b4 .teacher-five-head{background:linear-gradient(135deg,color-mix(in srgb,var(--gold) 10%,transparent),transparent)}

/* v2.5 Batch 16 deep-dive accent */
.teacher-b5{border-color:color-mix(in srgb,var(--gold) 42%,var(--line));}
.teacher-b5 .teacher-five-head{background:linear-gradient(135deg,color-mix(in srgb,var(--gold) 10%,transparent),transparent);}

/* v2.6 Batch 17 deep-dive accent */
.teacher-b6{border-color:color-mix(in srgb,var(--gold) 76%,var(--accent) 24%);background:linear-gradient(180deg,var(--card),color-mix(in srgb,var(--goldsoft) 68%,var(--card) 32%))}.teacher-b6 .teacher-five-head{border-bottom:1px solid color-mix(in srgb,var(--gold) 36%,var(--line) 64%)}

/* v2.7 Batch 18 deep-dive accent */
.teacher-b7{border-color:color-mix(in srgb,var(--gold) 82%,var(--accent) 18%);background:linear-gradient(180deg,var(--card),color-mix(in srgb,var(--goldsoft) 76%,var(--card) 24%))}.teacher-b7 .teacher-five-head{border-bottom:1px solid color-mix(in srgb,var(--gold) 42%,var(--line) 58%)}
.teacher-b8{border-color:color-mix(in srgb,var(--gold) 88%,var(--accent) 12%);background:linear-gradient(180deg,var(--card),color-mix(in srgb,var(--goldsoft) 82%,var(--card) 18%))}.teacher-b8 .teacher-five-head{border-bottom:1px solid color-mix(in srgb,var(--gold) 48%,var(--line) 52%)}

.teacher-b9{border-color:color-mix(in srgb,var(--gold) 92%,var(--accent) 8%);background:linear-gradient(180deg,var(--card),color-mix(in srgb,var(--goldsoft) 88%,var(--card) 12%))}.teacher-b9 .teacher-five-head{border-bottom:1px solid color-mix(in srgb,var(--gold) 58%,var(--line) 42%)}

.teacher-b10{border-color:color-mix(in srgb,var(--gold) 96%,var(--accent) 4%);background:linear-gradient(180deg,var(--card),color-mix(in srgb,var(--goldsoft) 92%,var(--card) 8%))}.teacher-b10 .teacher-five-head{border-bottom:1px solid color-mix(in srgb,var(--gold) 66%,var(--line) 34%)}

.teacher-b11{border-color:color-mix(in srgb,var(--gold) 98%,var(--accent) 2%);background:linear-gradient(180deg,var(--card),color-mix(in srgb,var(--goldsoft) 95%,var(--card) 5%))}.teacher-b11 .teacher-five-head{border-bottom:1px solid color-mix(in srgb,var(--gold) 72%,var(--line) 28%)}

.teacher-b12{border-color:color-mix(in srgb,var(--gold) 100%,var(--accent) 0%);background:linear-gradient(180deg,var(--card),color-mix(in srgb,var(--goldsoft) 97%,var(--card) 3%))}.teacher-b12 .teacher-five-head{border-bottom:1px solid color-mix(in srgb,var(--gold) 78%,var(--line) 22%)}

.teacher-b13{border-color:color-mix(in srgb,var(--gold) 100%,var(--accent) 0%);background:linear-gradient(180deg,var(--card),color-mix(in srgb,var(--goldsoft) 99%,var(--card) 1%))}.teacher-b13 .teacher-five-head{border-bottom:1px solid color-mix(in srgb,var(--gold) 84%,var(--line) 16%)}

.teacher-b14{border-color:color-mix(in srgb,var(--gold) 100%,var(--accent) 0%);background:linear-gradient(180deg,var(--card),color-mix(in srgb,var(--goldsoft) 99%,var(--card) 1%))}.teacher-b14 .teacher-five-head{border-bottom:1px solid color-mix(in srgb,var(--gold) 90%,var(--line) 10%)}

.teacher-b15{border-color:color-mix(in srgb,var(--gold) 100%,var(--accent) 0%);background:linear-gradient(180deg,var(--card),color-mix(in srgb,var(--goldsoft) 99%,var(--card) 1%))}.teacher-b15 .teacher-five-head{border-bottom:1px solid color-mix(in srgb,var(--gold) 94%,var(--line) 6%)}

.teacher-b16{border-color:color-mix(in srgb,var(--gold) 100%,var(--accent) 0%);background:linear-gradient(180deg,var(--card),color-mix(in srgb,var(--goldsoft) 99%,var(--card) 1%))}.teacher-b16 .teacher-five-head{border-bottom:1px solid color-mix(in srgb,var(--gold) 96%,var(--line) 4%)}

.teacher-b17{border-color:color-mix(in srgb,var(--gold) 100%,var(--accent) 0%);background:linear-gradient(180deg,var(--card),color-mix(in srgb,var(--goldsoft) 99%,var(--card) 1%))}.teacher-b17 .teacher-five-head{border-bottom:1px solid color-mix(in srgb,var(--gold) 96%,var(--line) 4%)}

/* Batch 29 / deep-dive batch 18: same restrained visual family, distinct audit hook. */
.teacher-b18{position:relative}
.teacher-b18 .teacher-five-head{border-inline-start:3px solid var(--gold);padding-inline-start:14px}

.teacher-b19{position:relative}
.teacher-b19 .teacher-five-head{border-inline-start:3px solid var(--gold);padding-inline-start:14px}

.teacher-b20{position:relative}
.teacher-b20 .teacher-five-head{border-inline-start:3px solid var(--gold);padding-inline-start:14px}

.teacher-b21{position:relative}
.teacher-b21 .teacher-five-head{border-inline-start:3px solid var(--gold);padding-inline-start:14px}

.teacher-b22{position:relative}
.teacher-b22 .teacher-five-head{border-inline-start:3px solid var(--gold);padding-inline-start:14px}

/* v5.0 read-time layout corrections; source content is untouched. */
.reader-wrap,.reader-wrap>.panel,.reader-wrap>.original,.chapter-teach-grid>*,.chapter-resource-row>*{min-width:0}
.reader-wrap>.original{overflow-wrap:anywhere;line-height:1.85}
.original>p,.original>ul,.original>ol,.original>blockquote{max-width:100%;line-height:1.9}
.original ul,.original ol{padding-inline-start:1.65em;margin:1em 0}
.original li{padding-left:.15em;margin:.36em 0}
.original li>p{margin:.3em 0}
.original blockquote{border-left:3px solid var(--gold);margin:1.1em 0;padding:.5em 1em;background:var(--soft)}
.original pre{max-width:100%;overflow:auto;white-space:pre;font-size:.86em;border:1px solid var(--line);background:var(--soft);padding:1rem;border-radius:10px}
.original code{overflow-wrap:anywhere}
.original pre code{overflow-wrap:normal}
.original table{width:100%;border-collapse:collapse;font-size:.91em;min-width:max-content}
.original th,.original td{border:1px solid var(--line);padding:9px 12px;text-align:left;vertical-align:top;max-width:440px;white-space:normal}
.original thead th{background:var(--soft);font-weight:750}
.original tbody tr:nth-child(even){background:color-mix(in srgb,var(--soft) 60%,transparent)}
.original .md-table-scroll{max-width:100%;overflow:auto;overscroll-behavior-inline:contain;margin:1.2em 0;border-radius:10px}
.original .math-block,.original .source-equation{max-width:100%;overflow-x:auto;overflow-y:hidden;padding:10px 6px;margin:16px 0;text-align:center}
.original mjx-container[display="true"]{max-width:100%;width:max-content!important;min-width:min-content;margin:.35em auto!important}
.chapter-formula,.birth-formula,.teacher-five-grid article{min-width:0;max-width:100%}
.chapter-formula mjx-container[display="true"],.birth-formula mjx-container[display="true"]{max-width:none;width:max-content!important}
@media(max-width:900px){.reader-wrap{grid-template-columns:minmax(0,1fr)!important}.reader-wrap .chapter-index{position:static!important;max-height:200px!important}.chapter-teach-grid,.chapter-resource-row{grid-template-columns:minmax(0,1fr)!important}.chapter-teach-head{flex-wrap:wrap}.teacher-five-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:560px){.teacher-five-grid{grid-template-columns:minmax(0,1fr)}.formula-birth-card{grid-column:span 1}.original{padding:14px!important}.original table{font-size:.85em}.chapter-teach-head{padding:14px}}



/* v5.0.2 · chapter formula reliability and layout */
.chapter-formula-math,.birth-formula{min-width:0;max-width:100%;overflow-x:auto;overflow-y:hidden;overscroll-behavior-inline:contain;padding-bottom:2px}
.chapter-formula-math .ght-tex-source,.birth-formula .ght-tex-source{display:block;min-height:2.2em}
.chapter-formula-math mjx-container[display="true"],.birth-formula mjx-container[display="true"]{width:max-content!important;min-width:min-content;max-width:none;margin:.35em auto!important;padding-inline:2px}
.chapter-formula{align-items:center}
.chapter-formula>span{padding-top:0;align-self:start;margin-top:.8em}
@media(max-width:1180px){.chapter-teach-grid{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}.chapter-teach-grid>.panel:nth-child(3){grid-column:1/-1}}
@media(max-width:720px){.chapter-teach-grid{grid-template-columns:minmax(0,1fr)}.chapter-teach-grid>.panel:nth-child(3){grid-column:auto}.chapter-formula{grid-template-columns:24px minmax(0,1fr);gap:6px}.chapter-formula-math,.birth-formula{padding-bottom:5px}}


/* v5.0.2 · RenSpectrum lockup copied from the v3.4 workbench display rules. */
:root{--brand-ink:#111827;--brand-accent:#2563eb;--brand-accent-2:#0ea5e9;--brand-grid:#dcdfe4}
html[data-theme="dark"]{--brand-ink:#e5e7eb;--brand-accent:#60a5fa;--brand-accent-2:#22d3ee;--brand-grid:#273244}
.sidebar .brand-block{display:flex;align-items:center;gap:10px;margin-bottom:18px}
.sidebar .brand-mark{width:44px;height:44px;flex:0 0 44px;display:block;transition:transform .18s ease}
.sidebar .brand-text{min-width:0}
.sidebar .brand-name{font-weight:850;font-size:18px;letter-spacing:-.02em;margin:0;color:var(--fg)}
.sidebar .brand-cn{font-size:12px;color:var(--muted);margin-top:1px}
.sidebar .brand-version{font-size:10px;color:var(--muted);margin-top:2px;line-height:1.3}
.sidebar .logo-ink{stroke:var(--brand-ink)}
.sidebar .logo-accent{stroke:var(--brand-accent);fill:var(--brand-accent)}
.sidebar .logo-accent-2{stroke:var(--brand-accent-2);fill:var(--brand-accent-2)}
.sidebar .logo-grid{stroke:var(--brand-grid)}
.sidebar .brand-logo-link{display:block;color:inherit}
.sidebar .brand-logo-link:hover .brand-mark{transform:translateY(-1px)}


/* v5.1.0 · RenSpectrum screenshot / collaboration preview */
.workbench-preview-card{margin-top:22px}
.workbench-preview-head{align-items:flex-start;margin-bottom:12px}
.workbench-shot-viewport{max-height:72vh;overflow:auto;overscroll-behavior:contain;border:1px solid var(--line);border-radius:12px;background:var(--soft);box-shadow:inset 0 0 0 1px color-mix(in srgb,var(--card) 65%,transparent)}
.workbench-shot-viewport img{display:block;width:100%;height:auto;max-width:none;background:#fff}
.workbench-shot-viewport.secondary{max-height:56vh}
.workbench-secondary-shot{margin-top:16px}
.workbench-secondary-shot summary{cursor:pointer;font-weight:800;color:var(--fg)}
.collaboration-access{margin-top:18px}
.collaboration-access h2{margin:.2em 0 .6em;font-size:clamp(20px,2vw,28px)}
.collaboration-access p,.collaboration-access li{line-height:1.9}
.collaboration-access ol{padding-inline-start:1.45em}
.collaboration-access li{margin:.45em 0}
@media(max-width:720px){.workbench-preview-head{display:block}.workbench-preview-head .btn{margin-top:8px;width:100%}.workbench-shot-viewport{max-height:68vh}.collaboration-access{padding:17px}}

/* v5.1.1 bilingual book PDF links */
.header-book-link{display:inline-flex;align-items:center;justify-content:center;white-space:nowrap;text-decoration:none;border:1px solid var(--line);background:var(--card);color:var(--fg);border-radius:9px;padding:8px 11px;font-size:11px;font-weight:750}
.header-book-link:hover,.footer-book-link:hover{border-color:var(--gold);color:var(--accent)}
.footer-book-link{display:inline-flex;align-items:center;gap:6px;font-weight:750;text-decoration:none;border-bottom:1px solid currentColor}
.collaboration-access{margin:20px 0}.workbench-preview-card{margin-top:16px}.workbench-secondary-shot{margin-top:16px}
@media(max-width:760px){.header-book-link{font-size:10px;padding:7px 8px}.top-actions{flex-wrap:wrap;justify-content:flex-end}}
@media(max-width:520px){.header-book-link{order:5;width:100%;max-width:150px}.progress-chip{display:none}}

/* merged portal release: project/about collaboration panel */
.collaboration-card{margin-top:18px}.collaboration-card h2{margin:.2em 0 .7em}.collaboration-card ol{padding-left:1.5rem;line-height:1.75}.collaboration-card li{margin:.55rem 0}.collaboration-card a{overflow-wrap:anywhere}

/* v1.0.2 portal return */
.portal-return-wrap{margin-top:10px}.portal-return-btn{display:inline-flex;align-items:center;justify-content:center;padding:9px 14px;border:1px solid var(--line);border-radius:999px;text-decoration:none;font-weight:800;transition:.2s}.portal-return-btn:hover{transform:translateY(-1px)}html[lang="zh-CN"] .portal-return-en{display:none}html[lang="en"] .portal-return-zh{display:none}