:root { color-scheme: light; font-family: Georgia, "Times New Roman", serif; color: #202823; background: #fff; }
* { box-sizing: border-box; letter-spacing: 0; } body { margin: 0; } [hidden] { display: none !important; }
a { color: #095e68; text-underline-offset: 3px; } a:hover { color: #8b1014; } a:focus-visible, input:focus-visible, button:focus-visible { outline: 3px solid #096e80; outline-offset: 3px; }
.site-header, main, footer { max-width: 1120px; margin: 0 auto; padding-left: 28px; padding-right: 28px; } .site-header { padding-top: 24px; padding-bottom: 20px; border-bottom: 1px solid #d9dfdc; } .site-header img { display: block; width: 280px; max-width: 100%; height: auto; } .site-header p { margin: 3px 0 0; font-size: 14px; font-style: italic; }
.article-heading { padding: 28px 0 22px; } .eyebrow { font: 700 11px Arial, sans-serif; text-transform: uppercase; color: #4a6258; margin: 0 0 12px; } .eyebrow span { margin-left: 12px; padding-left: 12px; border-left: 1px solid #bbc9c1; color: #8b1014; }
h1 { font-size: 34px; line-height: 1.15; margin: 0 0 10px; overflow-wrap: break-word; } h2 { font-size: 24px; line-height: 1.25; margin: 0 0 12px; } h3 { font-size: 18px; margin: 0 0 12px; } p { line-height: 1.6; margin: 0 0 16px; } .intro { color: #546058; font-size: 18px; } .equation { font-size: 23px; margin-bottom: 8px; } .conditions, .small { color: #546058; font-size: 14px; }
.explorer { border-top: 1px solid #bbc9c1; border-bottom: 1px solid #d9dfdc; padding: 24px 0; } .controls { display: grid; grid-template-columns: minmax(0,1fr) 260px; gap: 34px; align-items: start; } .controls label, .mass-panel label { font-size: 17px; } input[type="range"] { width: 100%; margin: 13px 0 5px; accent-color: #12655a; cursor: pointer; } .range-ends { display: flex; justify-content: space-between; font: 12px Arial, sans-serif; color: #546058; } .orbit-kind h2 { font-size: 20px; margin: 0 0 8px; } .orbit-kind p { font-size: 14px; color: #546058; margin: 0; }
.scene-wrap { display: grid; grid-template-columns: minmax(0,1fr) 235px; gap: 24px; align-items: stretch; margin-top: 22px; } canvas { width: 100%; height: 430px; display: block; border: 1px solid #d0ddd6; background: #f5f8f6; } aside { border-left: 2px solid #cbd9d1; padding: 6px 0 0 18px; } aside h2 { font-size: 18px; } dl { font-family: Arial, sans-serif; margin: 0; } dt { color: #546058; font-size: 12px; margin-top: 16px; } dd { font-size: 17px; margin: 4px 0 0; font-variant-numeric: tabular-nums; }
.time-controls { display: grid; grid-template-columns: auto auto auto minmax(100px,1fr) auto; align-items: center; gap: 12px; margin: 18px 0; font: 14px Arial, sans-serif; } button { border: 1px solid #81968b; background: #fff; color: #1c332a; padding: 7px 12px; font: 14px Arial, sans-serif; cursor: pointer; border-radius: 3px; } button:hover { background: #edf5f0; } .time-controls input { margin: 0; }
.mass-panel { display: grid; grid-template-columns: minmax(250px, .8fr) minmax(0,1.2fr); gap: 28px; padding: 18px; border: 1px solid #d0ddd6; background: #f8faf8; } .mass-panel p { margin: 0 0 8px; font-size: 14px; } #mass-note { color: #546058; font-size: 13px; } .explorer-foot { display: flex; flex-wrap: wrap; gap: 14px 24px; margin: 17px 0 0; font: 13px Arial, sans-serif; color: #546058; }
.reference, .derivation { padding: 30px 0; border-bottom: 1px solid #d9dfdc; } .reference p, .derivation p { max-width: 900px; } .reference img { display: block; width: 100%; max-width: 980px; height: auto; margin: 12px auto; } .display { font-size: 20px; padding: 12px 16px; border-left: 3px solid #14756e; background: #f5f8f6; }
.reproduce { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; padding: 30px 0; } .download { display: inline-block; background: #12655a; color: #fff; font: 14px Arial, sans-serif; padding: 12px 15px; text-decoration: none; border-radius: 3px; } .download:hover { color: #fff; background: #104e47; } .download span { opacity: .85; font-size: 12px; margin-left: 9px; } footer { border-top: 1px solid #d9dfdc; padding-top: 20px; padding-bottom: 24px; font-size: 13px; }
@media (max-width: 700px) { .site-header, main, footer { padding-left: 18px; padding-right: 18px; } h1 { font-size: 28px; } .controls, .scene-wrap, .mass-panel, .reproduce { grid-template-columns: 1fr; gap: 20px; } aside { border-left: 0; border-top: 2px solid #cbd9d1; padding: 16px 0 0; } canvas { height: 340px; } .time-controls { grid-template-columns: auto auto 1fr; } .time-controls label { grid-column: 1; } .time-controls input { grid-column: 2 / 4; } .time-controls output { grid-column: 3; grid-row: 1; text-align: right; } .display { font-size: 17px; overflow-wrap: anywhere; } }