:root{color-scheme:dark;--bg:#11171b;--panel:#182126;--surface:#202b30;--line:#334046;--text:#eff3f1;--muted:#9fadb0;--world:#70d9e2;--china:#f3ab77;--ink:#152126;--paper:#f0f3f1;font-family:"Microsoft YaHei UI","Microsoft YaHei","PingFang SC",system-ui,sans-serif}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-size:14px;line-height:1.6}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button{color:inherit;border:0;background:none}a{color:inherit;text-decoration:none}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:2px solid var(--world);outline-offset:4px}button:disabled{opacity:.5;cursor:not-allowed}svg.lucide{width:18px;height:18px;flex:none;stroke-width:1.65}button svg{pointer-events:none}[hidden]{display:none!important}h1,h2,h3,p{margin:0}h1{font-size:24px;line-height:1.5;font-weight:600}h2{font-size:23px;line-height:1.5}h3{font-size:17px;font-weight:600}small{font-size:12px}.muted{color:var(--muted)}.eyebrow{font-size:11px;letter-spacing:1.3px;color:var(--muted)}.masthead{height:86px;padding:0 42px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);gap:24px}.brand{display:flex;align-items:center;gap:14px;flex:none}.brand-mark{font-size:25px;font-weight:800;border:1px solid #58676c;width:48px;height:46px;text-align:center;line-height:44px}.brand-mark span{color:var(--china)}.brand b{font-size:22px;letter-spacing:5px;display:block;line-height:1.3}.brand small{display:block;font-size:11px;color:var(--muted);letter-spacing:1.3px;margin-top:4px}.mode-switch{display:flex;background:#0d1316;padding:4px;border:1px solid #2b373b;border-radius:7px}.mode-switch button{display:flex;align-items:center;gap:8px;padding:9px 19px;color:var(--muted);border-radius:4px}.mode-switch button.active{background:#344348;color:#fff}.header-actions{display:flex;gap:18px;align-items:center}.quiet-button{display:flex;align-items:center;gap:7px;color:#cad3d3}.icon-button{height:34px;min-width:34px;display:inline-flex;align-items:center;justify-content:center;border-radius:4px}.icon-button:hover{background:#354248}.quiet-button:hover{color:var(--world)}main{max-width:1800px;margin:auto;padding:28px 42px 0}.workspace-heading{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;margin-bottom:25px}.workspace-heading .eyebrow{letter-spacing:1px;margin-bottom:9px}.eyebrow span{padding:0 9px;color:#5f7479}.edition{font-size:11px;color:var(--muted);white-space:nowrap;border-left:1px solid var(--line);padding-left:16px;margin-bottom:7px}.toolbar{display:flex;align-items:center;gap:12px;padding:0 0 19px}.search-field{display:flex;align-items:center;gap:11px;border:1px solid var(--line);border-radius:5px;padding:8px 12px;background:#1b252a;max-width:420px;flex:1}.search-field svg{color:var(--muted)}.search-field input{width:100%;min-width:100px;color:var(--text);border:0;outline:0;background:none;font-size:13px}.search-field input::placeholder{color:#a3b0b3}.search-field kbd{color:#84969b;border:1px solid #4c5b60;border-radius:3px;padding:0 5px;font:11px/17px inherit}.select-control{display:flex;gap:9px;align-items:center;color:var(--muted);font-size:12px;flex:none}.select-control select{color:var(--text);border:1px solid var(--line);background:#1b252a;padding:9px 28px 9px 10px;border-radius:5px;font-size:12px;max-width:225px}.timeline-stage{position:relative;background:linear-gradient(180deg,#1b262b,#192227 49%,#231f20);border:1px solid #3b474b;border-radius:7px;overflow:hidden}.stage-topline,.stage-bottomline{display:flex;justify-content:space-between;align-items:center;padding:10px 20px;gap:12px}.stage-topline{border-bottom:1px solid #344146;background:#182126}.range-readout{display:flex;gap:12px;align-items:center}.range-readout>span{font-size:17px;font-variant-numeric:tabular-nums;font-weight:600;letter-spacing:1px}.range-readout small{color:var(--muted);margin-left:8px}.range-readout>svg{color:var(--world)}.zoom-tools{display:flex;align-items:center;gap:5px;flex:none}.fit-button{display:flex;align-items:center;gap:7px;font-size:12px;border-left:1px solid #405055;padding:0 2px 0 15px;margin-left:7px}.lane-heading{display:flex;align-items:center;gap:10px;padding:15px 23px 4px;min-height:43px}.lane-dot{width:7px;height:7px;border-radius:50%;background:var(--world);box-shadow:0 0 14px #70d9e242}.lane-heading b{font-weight:600;font-size:13px;color:var(--world)}.lane-heading small{color:#90a0a5;font-size:11px;margin-left:4px}.lane-en{font-size:10px;letter-spacing:1.7px;color:#88a7ad;margin-left:2px}.china-heading{padding-top:0;padding-bottom:14px}.china-heading .lane-dot{background:var(--china);box-shadow:0 0 14px #f3ab7730}.china-heading b{color:var(--china)}.china-heading .lane-en{color:#be9e89}.stage-bottomline{border-top:1px solid #4a3c37;color:#a9b3b4;font-size:11px;background:#1b2023;min-height:39px}.stage-bottomline>span{display:flex;align-items:center;gap:8px}.stage-bottomline svg{width:13px;height:13px}.separator{margin:0 5px;color:#536369}.shared-axis-note{height:23px;background:#10191d;border-top:1px solid #344c53;border-bottom:1px solid #413c37;display:flex;align-items:center;justify-content:center;gap:10px;font-size:9px;letter-spacing:2px;color:#8b9b9f}.shared-axis-note svg{width:11px;height:11px}.vis-timeline{border:0;font-family:inherit}.vis-panel.vis-center,.vis-panel.vis-top,.vis-panel.vis-bottom{border-color:#405058}.vis-time-axis .vis-text{color:#a8b9bc;font-size:11px;padding-left:7px}.vis-time-axis .vis-text.vis-major{color:#d8e4e4;font-size:11px}.vis-time-axis .vis-grid.vis-minor{border-color:#ffffff08}.vis-time-axis .vis-grid.vis-major{border-color:#ffffff14}.vis-item{border:1px solid #4b636a;background:#24353c;color:var(--text);border-radius:4px;font-size:12px;box-shadow:0 3px 8px #0002;cursor:pointer;transition:border-color .15s,background .15s}.vis-item:hover,.vis-item.vis-selected{background:#2d4952;border-color:var(--world);z-index:5}.china-timeline .vis-item{border-color:#6c5445;background:#352c28}.china-timeline .vis-item:hover,.china-timeline .vis-item.vis-selected{background:#503b30;border-color:var(--china)}.vis-item.vis-box .vis-item-content{padding:0;white-space:normal}.vis-item.vis-dot{border-color:var(--world)}.china-timeline .vis-item.vis-dot{border-color:var(--china)}.vis-item.vis-line{border-color:#52717c}.china-timeline .vis-item.vis-line{border-color:#80624e}.timeline-item{width:186px;min-height:87px;padding:9px 11px 10px;position:relative;overflow:hidden}.item-meta{display:flex;justify-content:space-between;align-items:center;font-size:9px;color:#9fbcc1;margin-bottom:5px;gap:6px}.china-timeline .item-meta{color:#d8ad8e}.item-year{font-variant-numeric:tabular-nums;letter-spacing:1px;font-size:11px;font-weight:600;color:var(--world)}.china-timeline .item-year{color:var(--china)}.timeline-item strong{display:block;font-weight:500;line-height:1.55;font-size:12px;max-width:166px}.item-play{width:13px;height:13px;display:inline-flex;align-items:center;justify-content:center;margin-left:5px;border:1px solid #a8c4c8;border-radius:50%;font-size:7px;vertical-align:middle}.vis-item.course-highlight{box-shadow:0 0 0 1px #f2d99c}.vis-item.course-muted{opacity:.27}.china-timeline .vis-time-axis .vis-text{display:none}.china-timeline .vis-panel.vis-top{border:0}.no-results{position:absolute;inset:103px 0 39px;background:#172125eF;display:flex;flex-direction:column;align-items:center;justify-content:center;z-index:8;color:var(--muted);gap:9px}.no-results b{font-size:19px;color:var(--text)}.no-results>svg{width:30px;height:30px}.no-results button{color:var(--world);border-bottom:1px solid var(--world);padding:5px;margin-top:5px}.overview-strip{display:flex;align-items:center;gap:15px;color:#85969b;font-size:10px;margin:11px 0 32px}.overview-dots{position:relative;flex:1;height:24px;background:linear-gradient(transparent 46%,#3a484d 47%,#3a484d 51%,transparent 52%)}.overview-dots button{position:absolute;top:5px;width:7px;height:7px;border:0;border-radius:50%;background:var(--world);transform:translateX(-50%);padding:0}.overview-dots button.china{top:15px;background:var(--china)}.overview-dots button:after{content:"";position:absolute;inset:-5px}.overview-dots button:hover{box-shadow:0 0 0 4px #ffffff28}.overview-dots .overview-window{position:absolute;top:0;height:28px;border:1px solid #b8ced255;background:#a6ccd215;pointer-events:none;border-radius:2px}.section-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:18px}.section-heading .eyebrow{font-size:9px;letter-spacing:1.8px}.section-heading h2{font-size:21px;margin-top:5px}.section-heading>.muted{font-size:11px;margin-bottom:4px}.story-cards{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:15px}.story-card{display:block;text-align:left;min-width:0;padding:0;position:relative}.story-image{position:relative;width:100%;aspect-ratio:1.52;background:#24373c;overflow:hidden;border-radius:4px;border:1px solid #334a51;isolation:isolate}.story-image>img{width:100%;height:100%;object-fit:cover;transition:transform .4s;opacity:.78}.story-card:hover .story-image>img{transform:scale(1.05);opacity:1}.story-image:after{content:"";position:absolute;inset:0;background:linear-gradient(transparent 45%,#071014a0);pointer-events:none}.story-date{position:absolute;left:12px;top:11px;font-size:10px;letter-spacing:2px;padding:2px 7px;background:#0e181bc9;color:#e8f4f3;z-index:2}.story-play{position:absolute;bottom:9px;right:10px;width:26px;height:26px;background:#d4ebeae5;color:#17272b;display:flex;align-items:center;justify-content:center;border-radius:50%;z-index:2}.story-play svg{width:14px;height:14px;fill:currentColor}.story-card strong{display:block;font-size:12px;margin-top:10px;line-height:1.6;font-weight:500}.story-card small{display:block;color:var(--muted);font-size:10px;margin-top:4px}.story-complete{position:absolute;right:9px;top:9px;background:#122c25;color:#bce2cb;font-size:9px;padding:2px 6px;z-index:3}.fallback-visual{width:100%;height:100%;display:flex;align-items:center;justify-content:center;gap:8px;background:radial-gradient(ellipse at 70% 10%,#43707955,transparent 65%),#1f3037}.fallback-visual span{font-size:40px;letter-spacing:3px;font-weight:300;color:#bcd7d9}.story-card[data-story="resnet"] .fallback-visual,.story-card[data-story="deepseek"] .fallback-visual,.story-card[data-story="guizhou"] .fallback-visual{background:radial-gradient(ellipse at 70% 10%,#a2613e66,transparent 70%),#342d2a}.thinking-strip{margin:33px 0 29px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:22px 0;display:flex;justify-content:space-between;align-items:center;gap:24px}.thinking-strip>div:first-child{display:flex;align-items:center;gap:13px}.thinking-strip>div>svg{color:var(--world);width:25px;height:25px}.thinking-strip b{font-weight:500;font-size:13px;display:block}.thinking-strip small{color:var(--muted);display:block;margin-top:3px;font-size:11px}.lab-buttons{display:flex;gap:10px}.lab-buttons button{border:1px solid #435458;display:flex;align-items:center;gap:15px;padding:9px 12px;border-radius:4px;font-size:11px}.lab-buttons button:hover{border-color:var(--world);background:#24353b}.lab-buttons svg{width:14px;height:14px}footer{max-width:1800px;margin:0 auto;padding:0 42px 25px;display:flex;justify-content:space-between;gap:20px;align-items:flex-start;color:#839397;font-size:10px}footer>span{white-space:nowrap}footer p{max-width:720px}footer button{display:flex;align-items:center;gap:5px;white-space:nowrap;font-size:10px}.classroom-route{border-top:1px solid #405358;border-bottom:1px solid #405358;padding:15px 0 12px;margin:0 0 18px;display:flex;flex-wrap:wrap;align-items:center;gap:12px}.route-label{display:flex;align-items:center;gap:8px;color:var(--world);font-size:12px}.week-buttons{display:flex;gap:8px;flex:1}.week-buttons button{font-size:12px;border-bottom:2px solid transparent;padding:7px 9px;color:var(--muted);white-space:nowrap}.week-buttons button.active{color:#f4ddb2;border-color:#e7c184}.classroom-route p{flex-basis:100%;color:#c8d2d3;font-size:12px;margin-left:102px}.classroom-route p span{color:var(--muted);margin-left:12px}
/* Reading panels deliberately switch to a light, quiet evidence surface. */
dialog{color:var(--ink);background:var(--paper);border:0;border-radius:9px;padding:0;box-shadow:0 25px 120px #0008;max-height:92vh;max-height:92dvh;overscroll-behavior:contain}dialog::backdrop{background:#071014c7;backdrop-filter:blur(7px)}dialog button{color:var(--ink)}.event-dialog{width:1080px;max-width:calc(100% - 40px)}.sources-dialog{width:920px;max-width:calc(100% - 40px)}.lab-dialog{width:780px;max-width:calc(100% - 40px)}.dialog-shell{position:relative;padding:35px 38px}.dialog-close{position:absolute;right:15px;top:14px;z-index:12;background:#e1e7e3}.dialog-close:hover{background:#c7d5d0}.dialog-shell .eyebrow{color:#637e81;letter-spacing:1.4px}.detail-header{padding-right:35px;margin-bottom:25px}.detail-header h2{font-size:29px;margin:7px 0 12px;max-width:850px}.detail-tags{display:flex;align-items:center;gap:12px;color:#637478;font-size:12px}.detail-tags span:first-child{padding:2px 8px;background:#dae6e2;color:#31554f;border-radius:3px}.detail-grid{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(230px,1fr);gap:30px}.event-lead{font-size:15px;line-height:1.9;color:#2c4248;margin-bottom:21px}.story-player{position:relative;background:#152329;border-radius:5px;overflow:hidden}.story-player video{display:block;width:100%;aspect-ratio:16/9;background:#152329;object-fit:contain}.video-label{font-size:10px;color:#c7d6d5;background:#24373c;padding:7px 12px;display:flex;align-items:center;gap:6px}.video-label svg{width:12px;height:12px}.chapter-indicators{display:flex;gap:4px;margin:8px 0 0}.chapter-indicators span{height:3px;background:#cbd6d0;flex:1}.chapter-indicators span.played{background:#39827f}.video-caption{font-size:11px;color:#617977;margin-top:7px}.quiz-box{border-top:1px solid #b9cac3;margin-top:18px;padding-top:16px}.quiz-box h3{font-size:14px;margin:5px 0 11px}.quiz-box .eyebrow{font-size:9px}.quiz-answers{display:flex;flex-direction:column;gap:7px}.quiz-answer{border:1px solid #becdc6;padding:10px 11px;border-radius:4px;text-align:left;background:#f9fbf9;font-size:12px;display:flex;gap:9px;line-height:1.5}.quiz-answer:hover{border-color:#387976}.quiz-answer .answer-letter{color:#6b827e;flex:none}.quiz-answer.correct{border-color:#387967;background:#dcece3}.quiz-answer.wrong{border-color:#bb7b65;background:#f2e1d9}.quiz-feedback{font-size:12px;line-height:1.8;margin-top:11px;color:#315a50}.quiz-feedback.retry{color:#8a4935}.detail-aside{padding-left:3px}.reading-section{margin-bottom:22px}.reading-section h3{font-size:13px;display:flex;align-items:center;gap:8px;margin-bottom:8px}.reading-section h3 svg{width:15px;height:15px;color:#4e7473}.reading-section p{font-size:12px;line-height:1.9;color:#4b6266}.source-link{display:block;border-top:1px solid #c8d6cf;padding:14px 0;color:#216c70;font-size:12px;overflow-wrap:anywhere}.source-link span{font-size:10px;color:#6c8383;display:block;margin-bottom:5px}.source-link svg{width:12px;height:12px;display:inline;vertical-align:middle;margin-left:4px}.next-lesson{border-top:1px solid #cad7d0;padding-top:17px;display:flex;gap:9px;align-items:center;flex-wrap:wrap;font-size:11px;color:#6b827e}.secondary-button{display:inline-flex;align-items:center;justify-content:center;gap:7px;background:#dbe5df;border:1px solid #b7cbc0;border-radius:4px;padding:9px 12px;font-size:12px}.secondary-button:hover{background:#c9ddd2}.event-visual{width:100%;aspect-ratio:16/9;object-fit:cover;display:block;border-radius:4px;background:#dce6df}.visual-credit{font-size:10px;color:#6b837c;margin-top:6px}.text-event{border-left:2px solid #75a79a;padding:18px 23px;background:#e3ebe5;margin:19px 0}.text-event b{display:block;font-size:25px;font-weight:400;line-height:1.6;color:#41695e}.text-event small{display:block;margin-top:10px;color:#6d837d}.source-intro{line-height:1.9;color:#496268;margin:17px 0;font-size:13px}.notice{display:flex;gap:12px;background:#dfe8e1;border-left:2px solid #6d9284;padding:14px 16px;margin:18px 0 23px}.notice svg{flex:none;width:18px;height:18px;color:#4f7a6c}.notice p{font-size:12px;line-height:1.8;color:#4b645c}.source-list{border-top:1px solid #bfd0c8;margin-bottom:25px}.source-row{display:grid;grid-template-columns:56px 1fr 20px;gap:13px;align-items:start;border-bottom:1px solid #d0dbd4;padding:12px 0;color:#365a5c}.source-row>span{font-size:11px;color:#739085}.source-row b{font-size:12px;font-weight:500}.source-row small{display:block;color:#718784;font-size:10px;margin-top:3px}.source-row>svg{width:14px;height:14px;margin-top:3px}.sources-dialog .muted{font-size:11px;line-height:1.9;color:#72867e;margin:15px 0}.sources-dialog #assetCredits{font-size:11px;line-height:1.9;color:#5c7770;margin-top:10px}.sources-dialog #assetCredits a{text-decoration:underline}.lab-dialog h2{margin:8px 0 12px}.lab-intro{font-size:13px;color:#5b746c;line-height:1.8;margin-bottom:25px}.lab-diagram{background:#dae7df;border:1px solid #bfd2c6;padding:28px;border-radius:5px;margin:18px 0}.neuron-formula{font-size:25px;text-align:center;color:#2d6355;font-variant-numeric:tabular-nums;line-height:1.8}.neuron-sub{display:block;font-size:11px;color:#637f73;text-align:center;margin-top:8px}.slider-row{display:grid;grid-template-columns:130px 1fr 40px;gap:14px;align-items:center;margin:18px 0;font-size:12px}.slider-row input{accent-color:#377e6a;width:100%}.slider-row output{font-variant-numeric:tabular-nums;text-align:right}.neuron-inputs{display:flex;gap:15px;justify-content:center;margin-bottom:17px}.neuron-inputs label{font-size:12px}.lab-result{padding:13px 17px;background:#d6e8df;color:#30634e;font-size:13px;border-radius:4px;margin-top:17px}.lab-note{font-size:11px;color:#71877d;line-height:1.9;margin-top:17px}.attention-tokens{display:flex;gap:9px;margin:18px 0}.attention-token{flex:1;border-bottom:4px solid #5a9682;background:#dae7e0;padding:16px 6px;text-align:center;font-size:15px;transition:background .2s}.attention-token small{display:block;margin-top:5px;font-size:10px;color:#547367}.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(20px);padding:10px 18px;background:#dae6df;color:#214c3c;border:1px solid #8faf9f;border-radius:5px;box-shadow:0 8px 40px #0004;opacity:0;pointer-events:none;transition:.2s;z-index:999;font-size:12px;max-width:90vw}.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
@media(min-width:1600px){.timeline-item{width:210px;min-height:90px}.timeline-item strong{max-width:188px;font-size:13px}.story-card strong{font-size:14px}.story-card small{font-size:11px}.story-image{aspect-ratio:1.7}}
@media(max-width:1100px){.masthead{padding:0 24px}.header-actions{gap:7px}main{padding:24px 24px 0}.workspace-heading h1{font-size:21px}.edition span{display:none}.range-readout small{display:none}.story-cards{grid-template-columns:repeat(3,minmax(0,1fr));gap:22px 18px}.story-image{aspect-ratio:1.9}.thinking-strip{flex-direction:column;align-items:flex-start;gap:17px}.thinking-strip .lab-buttons{width:100%}.lab-buttons button{flex:1;justify-content:space-between}footer{padding-left:24px;padding-right:24px;flex-wrap:wrap}.week-buttons{gap:0}.week-buttons button{font-size:11px;padding:7px}.classroom-route p{margin-left:0}.timeline-item{width:168px;min-height:87px}.timeline-item strong{max-width:146px;font-size:11px}.detail-grid{gap:24px}.dialog-shell{padding:30px}}
@media(max-width:700px){.masthead{height:auto;min-height:76px;padding:15px 17px;gap:10px;flex-wrap:wrap}.brand{gap:10px}.brand-mark{width:38px;height:37px;line-height:35px;font-size:21px}.brand b{font-size:19px}.brand small{font-size:9px}.header-actions{margin-left:auto}.header-actions .quiet-button span{display:none}.mode-switch{order:3;width:100%;margin-top:5px}.mode-switch button{flex:1;justify-content:center;font-size:12px;padding:7px 10px}.header-actions .icon-button{display:none}main{padding:22px 15px 0}.workspace-heading{margin-bottom:17px}.workspace-heading h1{font-size:20px;max-width:320px;line-height:1.65}.workspace-heading .eyebrow{font-size:9px;letter-spacing:.5px}.workspace-heading .eyebrow span{padding:0 3px}.edition{display:none}.toolbar{flex-wrap:wrap;gap:10px;padding-bottom:15px}.search-field{flex-basis:100%;max-width:none;padding:9px 12px}.select-control{flex:1;min-width:0;gap:5px;font-size:10px}.select-control select{max-width:100%;width:100%;min-width:0;padding:8px 16px 8px 7px;font-size:10px}.toolbar>.icon-button{height:29px;min-width:27px}.toolbar>.icon-button svg{width:15px}.stage-topline{padding:7px 10px;gap:3px}.range-readout{gap:6px}.range-readout>span{font-size:13px;letter-spacing:0}.range-readout>svg{width:15px}.zoom-tools{gap:0}.zoom-tools .icon-button{min-width:29px;height:30px}.fit-button{font-size:10px;padding-left:7px;margin-left:2px;gap:3px}.fit-button svg{width:13px}.lane-heading{padding-left:12px;gap:7px}.lane-heading small{display:none}.lane-heading b{font-size:11px}.lane-en{font-size:8px}.timeline-item{width:139px;min-height:87px;padding:8px 9px}.timeline-item strong{max-width:120px;font-size:11px;line-height:1.55}.item-meta{font-size:8px}.item-year{font-size:10px}.stage-bottomline{font-size:9px;padding:9px 10px}.stage-bottomline>span:first-child{max-width:240px;flex-wrap:wrap;gap:4px}.stage-bottomline .separator{display:none}.stage-bottomline #eventCount{white-space:nowrap;font-size:9px}.overview-strip{margin-bottom:26px}.section-heading{display:block;margin-bottom:15px}.section-heading h2{font-size:19px}.section-heading>.muted{display:block;margin-top:8px;font-size:10px}.story-cards{grid-template-columns:repeat(2,minmax(0,1fr));gap:19px 12px}.story-image{aspect-ratio:1.4}.story-card strong{font-size:12px}.story-card small{font-size:9px}.story-date{top:8px;left:8px;font-size:9px}.story-play{width:23px;height:23px;right:8px;bottom:7px}.thinking-strip{margin:25px 0 20px}.thinking-strip b{font-size:12px}.thinking-strip small{font-size:10px}.lab-buttons{flex-wrap:wrap;gap:7px}.lab-buttons button{font-size:10px;gap:8px;white-space:nowrap;padding:8px 9px}.lab-buttons button:last-child{flex-basis:100%}footer{padding:0 15px 22px;gap:10px;font-size:9px}footer p{order:3;font-size:9px}.classroom-route{padding:9px 0;gap:5px}.route-label{font-size:10px;margin-right:8px}.week-buttons{overflow-x:auto;flex-basis:100%;padding:2px 0 5px;gap:4px}.week-buttons button{font-size:10px;padding:6px}.classroom-route p{font-size:11px}.classroom-route p span{margin-left:0;display:block;font-size:10px}.dialog-shell{padding:27px 21px}.event-dialog,.sources-dialog,.lab-dialog{max-width:calc(100% - 18px);max-height:95dvh}.dialog-close{right:10px;top:10px;width:29px;height:29px;min-width:29px}.detail-header{padding-right:20px;margin-bottom:19px}.detail-header h2{font-size:23px}.detail-grid{grid-template-columns:1fr;gap:25px}.detail-aside{padding:0}.event-lead{font-size:13px}.detail-tags{font-size:10px}.source-row{grid-template-columns:42px 1fr 13px;gap:10px}.source-row b{font-size:11px}.source-row small{font-size:9px}.sources-dialog h2,.lab-dialog h2{font-size:22px;padding-right:20px}.source-intro{font-size:12px}.slider-row{grid-template-columns:97px 1fr 28px;gap:9px;font-size:10px}.lab-diagram{padding:21px 10px}.neuron-formula{font-size:19px}.attention-tokens{gap:5px}.attention-token{font-size:12px;padding:14px 3px}.attention-token small{font-size:9px}}
/* The standalone library injects base CSS on execution. Scoped selectors keep
   our accessible visual styling independent of that injection order. */
.history-timeline .vis-timeline{border:0;font-family:inherit}
.history-timeline .vis-loading-screen{display:none;pointer-events:none}
.history-timeline .vis-item{border:1px solid #4b636a;background:#24353c;color:var(--text);border-radius:4px;font-size:12px;text-align:left}
.history-timeline .vis-item:hover,.history-timeline .vis-item.vis-selected{background:#2d4952;border-color:var(--world)}
.china-timeline.history-timeline .vis-item{border-color:#6c5445;background:#352c28}
.china-timeline.history-timeline .vis-item:hover,.china-timeline.history-timeline .vis-item.vis-selected{background:#503b30;border-color:var(--china)}
.history-timeline .vis-item.vis-box .vis-item-content{padding:0;white-space:normal}
.history-timeline .vis-item.vis-dot{border-color:var(--world);background:var(--world)}
.china-timeline.history-timeline .vis-item.vis-dot{border-color:var(--china);background:var(--china)}
.history-timeline .vis-item.vis-line{border-color:#52717c}
.china-timeline.history-timeline .vis-item.vis-line{border-color:#80624e}
.history-timeline .vis-panel.vis-center,.history-timeline .vis-panel.vis-top,.history-timeline .vis-panel.vis-bottom{border-color:#34464c}
.history-timeline .vis-time-axis .vis-grid.vis-minor{border-color:#ffffff07}
.history-timeline .vis-time-axis .vis-grid.vis-major{border-color:#ffffff12}
.history-timeline .vis-time-axis .vis-text{color:#a8b9bc;font-size:11px}
.history-timeline .vis-time-axis .vis-text.vis-major{color:#d8e4e4;font-size:11px}
.history-timeline .cluster-label{padding:12px 15px;font-size:11px;color:var(--text)}
.history-timeline .vis-item.vis-box{text-align:left}
.history-timeline .timeline-item{min-height:68px}
.select-control>span{white-space:nowrap;flex:none}
.video-transcript{font-size:11px;color:#5b756d;margin-top:10px}
.video-transcript summary{cursor:pointer;color:#2d6b64;padding:4px 0}
.video-transcript p{padding:4px 0;line-height:1.8}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important}}