/* The science notebook shares the album's quiet colors and geometric marks. */
:root{--ink:#244b40;--teal:#244b40;--teal-dark:#193c31;--mint:#eaf0e6;--paper:#faf9f2;--line:#dce1d6;--muted:#6c7971}
.header-inner{justify-content:space-between;gap:24px}.brand{white-space:nowrap;flex:none;letter-spacing:0;gap:10px}.brand-symbol{display:block;width:32px;height:32px;flex:none;object-fit:contain;border:0;border-radius:0;background:none}.brand small{font-size:10px;letter-spacing:1.2px;line-height:1.6;font-weight:400;margin-top:1px}.site-header nav{gap:26px;flex-wrap:wrap;justify-content:flex-end}.site-header nav a{white-space:nowrap;font-size:14px}.site-header nav a[aria-current=page]:after{bottom:-22px;height:2px}
.home-intro h1,.lab-heading h1,.notebook-header h1,.topic-dialog h2{font-family:Georgia,'Songti SC',serif}.home-intro h1{letter-spacing:.02em}.home-intro{padding-top:48px}.home-intro p{line-height:1.9}.intro-aside{border-color:var(--line)}.section-line{flex-wrap:wrap;gap:12px}.section-line h2{margin:0}.section-line span{line-height:1.7}.topic-card{border-radius:12px}.card-copy p{min-height:3.5em}.card-number{font-family:inherit;font-size:11px;letter-spacing:1px}.how-to{background:#eff2e8;border-radius:10px}.btn{min-height:44px}.btn svg{flex:none}.lab-heading{align-items:flex-start}.topic-picker{flex:none;gap:12px;white-space:nowrap;margin-top:8px}.topic-picker span{font-size:18px}.breadcrumb{padding:25px 0 18px}.experiment{border-radius:12px}.stage-wrap svg{display:block;aspect-ratio:640/370;min-height:0;max-height:400px}.stage-caption{flex-wrap:wrap;line-height:1.6;gap:5px 14px}.stage-caption span{max-width:100%}.stage-caption strong{white-space:normal}.zoom-scene{min-height:36px}.control-panel{display:block;background:#fffefb}.control-panel>summary{list-style:none;cursor:pointer;font-size:15px;font-weight:650;letter-spacing:0;display:flex;gap:10px;align-items:center;justify-content:space-between}.control-panel>summary::-webkit-details-marker{display:none}.control-panel>summary:after{content:'＋';font-size:19px;font-weight:400}.control-panel[open]>summary:after{content:'−'}.control-panel>summary small{display:block;font-size:12px;font-weight:400;color:var(--muted);margin-top:4px}.control-body{display:flex;flex-direction:column;gap:20px;margin-top:20px}.control-panel:not([open])>.control-body{display:none}.reset-params{align-self:flex-start;min-height:30px;text-decoration:underline;text-underline-offset:4px}.control-group label{gap:12px;flex-wrap:wrap}.control-group output{white-space:nowrap}.check-control{line-height:1.6}.check-control input{flex:none}.player{gap:8px;padding:15px 16px}.player-speed{margin-left:0}.player .sound-toggle{margin-left:auto}.player .time{font-variant-numeric:tabular-nums}.steps{display:flex;overflow-x:auto;gap:8px;padding:3px 1px 8px;scroll-padding:8px}.step-button{flex:1;white-space:nowrap;min-height:46px}.explanation{padding-top:4px}.source-details{line-height:1.8}.notes-bottom{flex-wrap:wrap}.notes-textarea{font-size:16px}.home-search{margin:0 0 24px;max-width:560px}.search-field{display:block}.search-field>span{display:block;font-size:13px;color:var(--muted);margin:0 0 8px}.search-field input{width:100%;min-width:0;min-height:48px;border:1px solid #b9c8bb;border-radius:8px;background:white;color:var(--ink);padding:11px 14px;font-size:16px}.search-field input:focus{outline-color:#8b9f65}.search-empty{padding:30px 0;line-height:1.8;color:var(--muted)}
.topic-dialog{width:min(720px,calc(100vw - 32px));max-height:min(760px,90dvh);border:1px solid var(--line);border-radius:16px;padding:28px;background:var(--paper);color:var(--ink);overflow:auto;overscroll-behavior:contain}.topic-dialog::backdrop{background:#193c3180;backdrop-filter:blur(4px)}.topic-dialog-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:18px;margin-bottom:22px}.topic-dialog-heading .eyebrow{font-size:11px;letter-spacing:1.5px;margin:0 0 8px}.topic-dialog h2{font-size:25px;line-height:1.5;margin:0}.topic-dialog-heading button{flex:none}.catalog-count{font-size:12px;color:var(--muted);margin:16px 0 8px}.catalog-list{display:grid;gap:9px}.catalog-item{display:grid;grid-template-columns:36px minmax(0,1fr) 24px;gap:12px;align-items:center;background:#fffefb;border:1px solid var(--line);border-radius:8px;padding:14px}.catalog-item:hover,.catalog-item[aria-current=page]{background:var(--mint);border-color:#9ab5a0}.catalog-number{font:italic 21px Georgia,serif;color:var(--accent)}.catalog-item strong{font-size:16px;display:block;line-height:1.6}.catalog-item small{font-size:12px;color:var(--muted);display:block;margin-top:3px}.catalog-arrow{text-align:right}.memory-embedded .topic-picker{display:none}
@media(max-width:1000px) and (min-width:741px){.experiment-grid{grid-template-columns:minmax(0,1fr) 265px}.player .btn{padding:8px 12px}.control-panel{padding:18px}.step-button{font-size:12px;gap:5px}}
@media(max-width:740px){
  .header-inner{display:flex;flex-direction:column;align-items:stretch;padding:17px 18px 0;gap:12px}.brand{font-size:21px;align-self:flex-start}.brand-symbol{width:32px;height:32px}.brand small{font-size:10px}.site-header nav{margin:0;justify-content:space-between;gap:16px}.site-header nav a{padding:10px 0 14px;font-size:13px}.site-header nav a[aria-current=page]:after{bottom:0}.site-header nav a:first-child{margin-right:auto}main{padding:0 16px}.home-intro{padding:30px 0}.home-intro h1{font-size:36px;line-height:1.4;margin:12px 0}.home-intro p{font-size:15px}.home-intro p br{display:none}.section-line{display:block;margin-bottom:18px}.section-line h2{font-size:20px;margin:0 0 5px}.section-line span{font-size:12px}.card-scene{height:190px}.card-copy{padding:20px}.card-copy h3{font-size:23px}.card-copy p{min-height:0;font-size:14px}.card-bottom{margin-top:17px}.home-search{margin-bottom:18px}.breadcrumb{font-size:12px;padding:19px 0 14px}.lab-heading{display:flex;gap:14px;margin-bottom:20px}.lab-heading>div{min-width:0;flex:1}.lab-heading .tag{font-size:11px;line-height:1.5;display:block}.lab-heading h1{font-size:27px;line-height:1.45;margin:5px 0 6px}.lab-heading p{font-size:14px;line-height:1.75}.topic-picker{padding:7px 10px;font-size:12px;gap:5px;margin-top:0;min-height:40px}.topic-picker span{font-size:14px}.experiment-grid{display:block}.experiment-top{padding:13px 14px;flex-wrap:wrap;gap:5px}.experiment-top strong{font-size:14px}.sim-label{font-size:10px}.stage-wrap{padding:35px 9px 0}.stage-wrap svg{width:100%;height:auto;aspect-ratio:360/310;max-height:none;min-height:0}.stage-caption{margin:5px 14px 14px;font-size:11px;display:block}.stage-caption strong{display:block;font-size:12px;margin-top:5px}.zoom-scene{top:7px;right:10px;padding:4px 8px;min-height:30px;font-size:11px}.player{display:grid;grid-template-columns:1fr 1fr 1fr 1fr;gap:8px;padding:13px 12px}.player .btn{min-height:44px;font-size:13px;padding:8px 5px;white-space:nowrap;gap:4px}.player #play{grid-column:1/4;grid-row:1}.player #mute{grid-column:4;grid-row:1;width:100%;margin:0}.player #replay{grid-column:2/4;grid-row:2}.player #previous{grid-column:1;grid-row:2}.player #next{grid-column:4;grid-row:2}.player-speed{grid-column:1/3;grid-row:3;gap:8px;font-size:12px}.player-speed select{min-height:38px;min-width:67px}.player .time{grid-column:3/5;grid-row:3;text-align:right;margin:0;font-size:12px}.player .finish-tip{grid-column:1/-1;grid-row:4;margin:0;font-size:12px}.timeline{padding:0 12px 14px;gap:7px}.timeline button{height:8px}.steps{margin:17px 0 12px;gap:7px}.step-button{flex:0 0 auto;flex-direction:row;font-size:12px;gap:7px;padding:9px 11px;min-height:44px}.step-button b{width:22px;height:22px;font-size:11px}.explanation{display:block;padding:6px 1px 22px}.explanation .eyebrow{font-size:10px}.explanation h2{font-size:22px;margin:6px 0 10px}.explanation p{font-size:15px;line-height:1.9}.watch-for{font-size:13px!important}.control-panel{margin:0 0 24px;padding:18px;border:1px solid var(--line);border-radius:10px}.control-body{gap:18px;margin-top:19px}.control-group label{font-size:14px}.param-insight{margin:0;padding-top:16px}.param-insight p{font-size:14px}.learning-bottom{gap:16px;margin-top:0}.learning-card{padding:20px 18px}.learning-card h2{font-size:20px}.learning-card .section-kicker{font-size:10px}.notes-bottom .save-status{width:100%;font-size:12px}.notes-bottom .btn{width:100%}.source-details{font-size:12px}.topic-dialog{padding:20px 17px;width:calc(100vw - 24px);max-height:88dvh;border-radius:12px}.topic-dialog h2{font-size:21px}.topic-dialog-heading{gap:10px}.topic-dialog-heading button{padding:7px 11px}.catalog-item{padding:13px 11px;gap:8px;grid-template-columns:27px minmax(0,1fr) 18px}.catalog-item strong{font-size:15px}.catalog-item small{font-size:12px}.memory-embedded main{padding:0 13px 24px}.memory-embedded .lab-heading{padding-top:16px}.memory-embedded .lab-heading h1{font-size:25px}.memory-embedded .control-panel{margin-bottom:20px}
}
@media(prefers-reduced-motion:reduce){.steps{scroll-behavior:auto}}
@media(max-width:740px){.stage-wrap svg{max-width:430px;margin:0 auto}}