.orbit-note{--orbit-ink:#334b43;--orbit-green:#5b745b;--orbit-gold:#c38b28;--orbit-red:#bf6651}.orbit-note .lesson-part{scroll-margin-top:88px}.orbit-note .note-prose{line-height:1.95}.orbit-core{margin:26px 0 36px;padding:20px 26px;border-left:4px solid #91a07c;background:#edf0e5;border-radius:0 16px 16px 0}.orbit-core strong{font-size:1.12rem;color:var(--orbit-ink)}.orbit-core p{margin:8px 0 0;color:#64705e}.orbit-lab{margin:26px 0 34px;padding:20px;border:1px solid #cbd2bf;border-radius:22px;background:#fafbf5;box-shadow:0 8px 28px #56654408;scroll-margin-top:90px}.orbit-lab-heading{display:flex;gap:16px;justify-content:space-between;align-items:center}.orbit-lab-heading span{font-size:.8rem;color:#77836e}.orbit-lab-heading h3{margin:5px 0 0;color:#334b43;font-size:1.25rem}.orbit-note button{font:inherit;cursor:pointer}.orbit-lab button{border:1px solid #ccd3c2;background:#fffef8;color:#52634b;border-radius:9px;padding:7px 12px;min-height:38px}.orbit-lab button:hover{background:#edf0e4}.orbit-lab button[aria-pressed=true]{background:#647854;color:white;border-color:#647854}.orbit-lab .lab-observation{display:flex;gap:14px;align-items:baseline;margin:16px 0;padding:12px 16px;background:#edf0e5;border-radius:11px;font-size:.94rem;line-height:1.6}.orbit-lab .lab-observation strong{white-space:nowrap;color:#556c49}.orbit-control-row{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;margin:0 0 10px}.orbit-presets,.tilt-options{display:flex;gap:5px}.orbit-location{color:#6a7764;font-size:.85rem;display:flex;align-items:center;gap:5px}.orbit-stage{display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:12px}.orbit-stage canvas{display:block;width:100%;height:auto;min-width:0;aspect-ratio:700/440}.orbit-plots canvas{aspect-ratio:640/440}.orbit-readouts{display:grid;grid-template-columns:repeat(3,1fr);margin:8px 0 14px;border-top:1px solid #e2e5d9;border-bottom:1px solid #e2e5d9;padding:12px 0;gap:12px}.orbit-readouts div{text-align:center}.orbit-readouts span{display:block;font-size:.8rem;color:#73806b;margin-bottom:4px}.orbit-readouts strong{font-size:1.14rem;color:#435844;font-variant-numeric:tabular-nums}.orbit-slider-row{display:flex;align-items:center;gap:14px}.orbit-slider-row label{display:flex;flex-direction:column;font-size:.72rem;color:#73806b;white-space:nowrap;min-width:68px}.orbit-slider-row output{font-size:.95rem;font-weight:700;color:#435844;font-variant-numeric:tabular-nums}.orbit-slider-row input{flex:1;min-width:60px;accent-color:#657a55;cursor:pointer}.orbit-slider-row button{white-space:nowrap;font-size:.86rem}.orbit-model-caption{font-size:.83rem;line-height:1.6;color:#72806b;margin:14px 0 0;text-align:center}.orbit-comparison{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:25px 0}.orbit-comparison article{background:#eff1e8;padding:24px;border-radius:16px}.orbit-comparison article+article{background:#f4eee3}.orbit-comparison span{font-size:.85rem;color:#758367}.orbit-comparison h3{margin:8px 0;color:#435642}.orbit-comparison p{line-height:1.75;margin:0}.orbit-note .next-note{margin-top:36px}.orbit-note .sources-line{flex-wrap:wrap}.orbit-lab.expanded{position:fixed;inset:0;z-index:1000;margin:0;border:0;border-radius:0;padding:22px max(22px,calc((100vw - 1680px)/2));overflow:auto;background:#fafbf5;display:flex;flex-direction:column}.orbit-lab.expanded .orbit-stage{flex:1;min-height:0;max-height:calc(100dvh - 300px)}.orbit-lab.expanded .orbit-stage canvas{max-height:calc(100dvh - 310px);object-fit:contain}.orbit-lab.expanded .orbit-plots{min-height:0}.orbit-lab.expanded .orbit-lab-heading h3{font-size:1.4rem}.orbit-lab.expanded .orbit-model-caption{margin-top:8px}body.orbit-expanded{overflow:hidden}.orbit-note .primer-jumps{flex-wrap:wrap}#orbit-notebook{max-width:780px}#orbit-notebook h2{font-size:1.4rem;line-height:1.6}#orbit-notebook .explanation-paper p{line-height:1.9}#orbit-notebook .orbit-answer{font-weight:650;color:#3d583d;font-size:1.05rem}#orbit-notebook .orbit-diagram{width:100%;height:auto;display:block;margin:22px auto}#orbit-notebook .formula-equation{font-size:1.35rem;background:#edf1e5;padding:20px;border-radius:12px;text-align:center;margin:20px 0}#orbit-notebook dl{display:grid;grid-template-columns:auto 1fr;gap:10px 16px;line-height:1.6}#orbit-notebook dd{margin:0}#orbit-notebook dt{font-weight:bold;color:#546948}#orbit-notebook details{margin-top:20px}#orbit-notebook summary{cursor:pointer;color:#5d704e}#orbit-notebook button:focus-visible,.orbit-note button:focus-visible,.orbit-note input:focus-visible{outline:3px solid #bf9e47;outline-offset:3px}
@media(min-width:1450px){.orbit-stage{min-height:320px}}
@media(max-width:700px){.orbit-lab{padding:14px;border-radius:16px}.orbit-lab-heading h3{font-size:1.06rem}.orbit-lab-heading .orbit-expand{font-size:.75rem;padding:6px 9px}.orbit-stage{grid-template-columns:1fr;gap:0}.orbit-stage>canvas{max-height:280px;object-fit:contain}.orbit-plots canvas{max-height:280px;object-fit:contain}.orbit-lab .lab-observation{display:block;padding:10px 12px}.orbit-lab .lab-observation strong{display:block;margin-bottom:3px}.orbit-control-row{gap:9px}.orbit-lab button{font-size:.8rem;padding:6px 10px}.orbit-location{font-size:.76rem}.orbit-readouts{gap:6px}.orbit-readouts span{font-size:.7rem}.orbit-readouts strong{font-size:.95rem}.orbit-slider-row{flex-wrap:wrap;gap:8px}.orbit-slider-row input{order:4;flex-basis:100%;width:100%;margin:6px 0}.orbit-slider-row label{margin-right:auto}.orbit-comparison{grid-template-columns:1fr}.orbit-core{padding:16px}.orbit-core strong{font-size:1rem}.orbit-lab.expanded{padding:15px}.orbit-lab.expanded .orbit-stage{max-height:none;flex:none}.orbit-lab.expanded .orbit-stage canvas{max-height:290px}.orbit-model-caption{text-align:left}}
@media(prefers-reduced-motion:reduce){.orbit-note *{scroll-behavior:auto!important}}

@media(min-width:701px){.orbit-lab.expanded>.orbit-stage{flex:1 1 0;min-height:160px;max-height:none;overflow:hidden;align-items:stretch}.orbit-lab.expanded>:not(.orbit-stage){flex-shrink:0}.orbit-lab.expanded .orbit-stage>canvas,.orbit-lab.expanded .orbit-plots canvas{width:100%;height:100%;max-height:100%;object-fit:contain}.orbit-lab.expanded .orbit-plots{height:100%;min-height:0;overflow:hidden}}

@media(min-width:701px){.orbit-lab.expanded .orbit-stage{position:relative;display:block}.orbit-lab.expanded .orbit-stage>canvas{position:absolute;left:0;top:0;width:49.5%;height:100%;aspect-ratio:auto}.orbit-lab.expanded .orbit-plots{position:absolute;right:0;top:0;width:49.5%;height:100%}.orbit-lab.expanded .orbit-plots canvas{position:absolute;inset:0;aspect-ratio:auto}}
.season-sky-panel canvas{aspect-ratio:700/440}.season-hour-row{margin-top:12px;padding-top:12px;border-top:1px dashed #d4dcc8}.season-hour-hint{color:#7d8a72;font-size:.75rem}.season-year-chart{border-top:1px solid #dce2d2;margin-top:12px;padding-top:10px}.season-year-chart summary{cursor:pointer;font-size:.9rem;color:#526b48;padding:4px 0}.season-year-chart canvas{display:block;width:100%;height:280px;object-fit:contain}.season-year-chart p{font-size:.85rem;text-align:center;color:#74816d}.orbit-lab.expanded .season-hour-row{margin-top:6px;padding-top:6px}.orbit-lab.expanded .season-year-chart{margin-top:6px;padding-top:5px}.orbit-lab.expanded .orbit-model-caption{font-size:.76rem}.orbit-lab.expanded:has(.season-year-chart[open]) .orbit-stage{flex:none;height:320px}.orbit-lab.expanded:has(.season-year-chart[open]){overflow-y:auto}
@media(max-width:700px){.season-hour-hint{display:none}.season-year-chart canvas{height:auto}.season-sky-panel canvas{max-height:none}.orbit-lab.expanded .season-sky-panel canvas{max-height:none}.orbit-lab.expanded:has(.season-year-chart[open]) .orbit-stage{height:auto}}

.season-controls{display:grid;grid-template-columns:1fr 1fr;gap:20px}.season-controls .season-hour-row{margin:0;padding:0;border:0}.season-controls .orbit-slider-row{gap:9px}.season-controls .orbit-slider-row label{min-width:64px}.season-controls .orbit-slider-row button{padding:7px 9px;font-size:.8rem}.orbit-lab.expanded .orbit-readouts{padding:8px 0;margin:5px 0 10px}.orbit-lab.expanded .orbit-readouts strong{font-size:1.05rem}.orbit-lab.expanded .season-year-chart{order:8}.orbit-lab.expanded .season-hour-row{padding:0;margin:0}@media(max-width:900px){.season-controls{grid-template-columns:1fr;gap:14px}}

/* Shared summary-notebook rhythm from notes 1–3. */
.orbit-note .lesson-part{padding-top:27px;margin-top:32px}
.orbit-note .lesson-part>h2{font-size:24px;line-height:1.5;margin-bottom:20px}
.orbit-note .lesson-part>h3{font-size:18px;line-height:1.7;margin-top:26px;margin-bottom:12px}
.orbit-note .note-prose{font-size:16px;line-height:1.95}
.orbit-note .primer-jumps{margin-bottom:12px}
.orbit-core{margin:0 0 28px var(--heading-indent);padding:16px 20px;border-left:3px solid #a3b68b;border-radius:0 7px 7px 0;background:#f0f3e7;color:#53664c}
.orbit-core strong{font-size:14px}.orbit-core p{font-size:15px;line-height:1.9;margin:7px 0}
.orbit-lab{margin:24px 0 28px var(--heading-indent);padding:0;border:1px solid #c5cdb8;border-radius:7px;background:#fffdf5;box-shadow:0 4px 0 #e6e5d5;overflow:hidden}
.orbit-lab-heading{padding:14px 18px;background:#eff2e4;border-bottom:1px solid #d3dcc3;gap:12px}
.orbit-lab-heading span{font-size:11px;color:#7b886d}.orbit-lab-heading h3{font-size:15px;line-height:1.7;margin:3px 0 0;color:#4c6840}
.orbit-lab button:not(.notebook-kind-button){font-family:var(--ad-font);border-radius:5px;min-height:36px;font-size:12px}
.orbit-lab .lab-observation{gap:10px;margin:0;padding:12px 18px;border-radius:0;border-bottom:1px solid #dce2d1;background:#f4f5eb;font:500 14px/1.75 var(--ad-font);color:#4d6044}
.orbit-lab .lab-observation strong{font-size:12px}
.orbit-control-row{margin:16px 18px 8px}.orbit-stage{margin:0 12px}
.orbit-readouts{margin:8px 18px 14px;padding:12px 0}.orbit-readouts strong{font-size:17px}.orbit-readouts span{font-size:12px}
.orbit-lab>.orbit-slider-row,.season-controls{margin:0 18px 16px}.orbit-model-caption{margin:12px 18px 16px;font-size:13px;line-height:1.8}
.season-year-chart{margin:0 18px 16px}.season-year-chart summary{font-size:13px}
.orbit-comparison{margin:22px 0 24px var(--heading-indent);gap:20px}.orbit-comparison article{border-radius:5px;padding:18px;border-block:1px solid #d9ddcc;background:#f1f3e7}.orbit-comparison h3{font-size:18px}.orbit-comparison p{font-size:15px;line-height:1.85}
.orbit-note .quiz-paper{margin-left:var(--heading-indent)}
#orbit-notebook{max-width:780px}#orbit-notebook h2{font-size:24px;line-height:1.6;margin-bottom:22px}
#orbit-notebook .orbit-answer{font-size:15px;font-weight:600;line-height:1.95}#orbit-notebook .orbit-diagram{margin:12px auto;max-height:260px}
#orbit-notebook .formula-equation{font-size:22px;border-radius:7px;margin:18px 0 20px var(--heading-indent);overflow-wrap:anywhere}
#orbit-notebook .formula-symbols{display:block;margin-left:var(--heading-indent)}#orbit-notebook .formula-symbols>div{display:grid;grid-template-columns:minmax(40px,auto) 1fr;gap:16px;padding:9px 0;border-bottom:1px solid #e0e4d5;font-size:14px}
#orbit-notebook details{margin:20px 0 0 var(--heading-indent);padding-top:12px;border-top:1px dashed #ccd5be}#orbit-notebook summary{font-size:14px}#orbit-notebook details p{font-size:14px;color:#617451}
.orbit-lab.expanded{margin:0;padding:0;border:0;border-radius:0;box-shadow:none}.orbit-lab.expanded .orbit-lab-heading{padding:12px 20px}.orbit-lab.expanded .orbit-lab-heading h3{font-size:18px}.orbit-lab.expanded .orbit-model-caption{font-size:12px;margin:6px 18px 10px}.orbit-lab.expanded .orbit-control-row{margin-top:12px}.orbit-lab.expanded .season-controls{margin-bottom:6px}
@media(max-width:700px){.orbit-note .lesson-part>h2{font-size:22px}.orbit-note .note-prose{font-size:15px}.orbit-core,.orbit-lab,.orbit-comparison,.orbit-note .quiz-paper{margin-left:0}.orbit-lab{padding:0;border-radius:7px}.orbit-lab-heading{padding:12px}.orbit-lab-heading h3{font-size:14px}.orbit-lab .lab-observation{display:block;padding:11px 13px;font-size:13px}.orbit-control-row{margin-inline:12px}.orbit-stage{margin-inline:5px}.orbit-readouts{margin-inline:12px}.orbit-lab>.orbit-slider-row,.season-controls{margin-inline:12px}.orbit-model-caption{text-align:center;margin-inline:12px}.orbit-lab.expanded{padding:0}#orbit-notebook h2{font-size:21px}#orbit-notebook .formula-equation,#orbit-notebook .formula-symbols,#orbit-notebook details{margin-left:0}.orbit-core p{font-size:14px}.orbit-comparison article{padding:16px}}

.orbit-note .orbit-lab .orbit-lab-heading h3{margin:0;font-size:15px;line-height:1.7}
.orbit-lab-heading>div>span{display:none}
.orbit-note .orbit-lab.expanded .orbit-lab-heading h3{font-size:18px}
@media(max-width:700px){.orbit-note .orbit-lab .orbit-lab-heading h3{font-size:14px}.orbit-lab-heading>div{min-width:0}#orbit-notebook .explanation-paper>.sun-heading{white-space:normal;word-break:keep-all;overflow-wrap:anywhere;overflow:visible}}

/* Transparent science illustrations: captions remain real, accessible text. */
.orbit-science-figure{margin:24px 0 30px var(--heading-indent);padding:0;text-align:center}
.orbit-science-figure img{display:block;width:100%;height:auto;max-height:380px;object-fit:contain;margin:auto}
.orbit-science-figure figcaption{max-width:760px;margin:12px auto 0;color:#617451;font-size:14px;line-height:1.85}
.orbit-science-figure figcaption strong{display:block;font-size:16px;font-weight:600;color:#4c6542}
.orbit-science-figure figcaption>span{display:block}.orbit-science-figure .orbit-art-labels{max-width:630px;display:grid;grid-template-columns:1fr 1fr 1fr;gap:18px}
.orbit-spin-figure img{max-height:340px}
#orbit-notebook .orbit-notebook-art{border:0;padding:0;margin-top:20px}#orbit-notebook .orbit-notebook-art img{max-height:300px}#orbit-notebook .orbit-notebook-art figcaption{text-align:center}
@media(max-width:700px){.orbit-science-figure{margin-left:0}.orbit-science-figure img{max-height:none}.orbit-science-figure .orbit-art-labels{gap:8px;font-size:12px}.orbit-science-figure figcaption strong{font-size:14px}.orbit-spin-figure figcaption{font-size:13px}#orbit-notebook .orbit-notebook-art{margin-left:0}}

/* Distance comparison notebook: readable labels stay in HTML. */
#orbit-notebook .orbit-distance-figure{margin:24px 0 24px var(--heading-indent);padding:0;border:0}
.orbit-distance-pair{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.orbit-distance-pair article{padding:18px;background:#eff1e7;border-radius:8px;min-width:0;color:#425740}
.orbit-distance-pair h3{font-size:17px;margin:0 0 10px}.orbit-distance-pair p{font-size:14px;line-height:1.6;margin:6px 0}
.orbit-distance-pair svg{width:100%;height:auto;display:block}.orbit-distance-pair article>span{font-size:14px}
.distance-energy-track{margin:8px 0 14px;background:#e0e5d6;border-radius:5px;height:30px;overflow:hidden}.distance-energy-track>div{background:#d8b85d;height:100%;text-align:right;padding-right:8px;box-sizing:border-box;line-height:30px;color:#453b22}
.orbit-distance-pair .distance-season{padding-top:8px;border-top:1px solid #d8dfcc}
#orbit-notebook .orbit-distance-figure figcaption{font-size:15px;text-align:center;margin-top:16px;color:#546948;line-height:1.7}
@media(max-width:700px){#orbit-notebook .orbit-distance-figure{margin-left:0}.orbit-distance-pair{gap:9px}.orbit-distance-pair article{padding:12px 9px}.orbit-distance-pair h3{font-size:15px}.orbit-distance-pair p{font-size:13px}}

.orbit-distance-pair .distance-science-art{display:block;width:100%;height:auto;object-fit:contain;margin:14px auto 18px;max-width:none;max-height:none;border:0;background:transparent}

.season-distance-strip{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;margin:0 20px 12px;padding:10px 0;border-block:1px solid #e0e5d5}.season-distance-strip p{margin:0;font-size:13px;color:#68775b;line-height:1.7}.season-distance-strip strong{color:#435844;font-variant-numeric:tabular-nums}.season-distance-strip .orbit-presets button{font-size:13px}
@media(max-width:700px){.season-distance-strip{margin-inline:12px;gap:8px}.season-distance-strip p{font-size:12px}}

.orbit-comparison article{text-align:center;min-width:0}.orbit-comparison .cycle-comparison-art{margin:16px 0 18px;padding:0;border:0;background:transparent}.orbit-comparison .cycle-comparison-art img{display:block;width:100%;height:auto;aspect-ratio:3/2;max-height:260px;object-fit:contain;margin:auto;background:transparent;border:0}.orbit-comparison article>p{max-width:420px;margin-inline:auto;text-wrap:pretty;word-break:keep-all}