:root {
  --bg: #05070f;
  --bg2: #0c1020;
  --panel: #121830;
  --text: #e8ecf5;
  --muted: #9aa4bf;
  --accent: #ffb347;
  --line: #2a3352;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: radial-gradient(ellipse at top, var(--bg2), var(--bg) 60%);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.55;
}
.visually-hidden { position:absolute; width:1px; height:1px; overflow:hidden; clip:rect(0 0 0 0); }

.site-header { text-align: center; padding: 2.5rem 1rem 1rem; }
.site-header h1 { margin: 0; font-size: clamp(2rem, 5vw, 3.2rem); letter-spacing: .08em; text-transform: uppercase; font-weight: 600; }
.tagline { color: var(--muted); margin: .5rem auto 0; max-width: 40rem; }

main { max-width: 1240px; margin: 0 auto; padding: 0 1rem 3rem; }
h2 { font-weight: 500; letter-spacing: .04em; margin: 2.5rem 0 .75rem; color: var(--accent); }

.map-controls { display: flex; flex-wrap: wrap; gap: 1rem 1.5rem; align-items: center; font-size: .9rem; color: var(--muted); margin: .5rem 0; }
.map-controls label { cursor: pointer; }
.map-controls .note { margin-left: auto; font-style: italic; }

.date-controls { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: .9rem 1.25rem; margin: .75rem 0; }
.date-row { display: flex; flex-wrap: wrap; gap: .6rem 1rem; align-items: center; }
.date-heading { margin-right: auto; }
.date-heading strong { color: var(--accent); font-weight: 600; }
.date-controls input[type=date], .date-controls select, .date-controls button {
  background: var(--bg2); color: var(--text); border: 1px solid var(--line); border-radius: 6px; padding: .35rem .6rem; font: inherit; font-size: .9rem; }
.date-controls button { cursor: pointer; }
.date-controls button:hover { border-color: var(--accent); }
.play { cursor: pointer; }
#date-slider { width: 100%; margin: .9rem 0 .2rem; accent-color: var(--accent); }
.slider-ends { display: flex; justify-content: space-between; font-size: .75rem; color: var(--muted); }
.map-wrap { background: #030509; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
#map { width: 100%; height: auto; display: block; }
#map .orbit { fill: none; stroke: #2c3555; stroke-width: 1; }
#map .body { cursor: pointer; transition: filter .15s; }
#map .body:hover, #map .body:focus { filter: brightness(1.35) drop-shadow(0 0 6px rgba(255,255,255,.5)); outline: none; }
#map .body.selected .planet { stroke: #fff; stroke-width: 2; }
#map .label { fill: var(--text); font-size: 13px; pointer-events: none; text-anchor: middle; }
#map .belt-label { fill: var(--muted); font-size: 12px; pointer-events: none; text-anchor: middle; font-style: italic; }
#map .hitring { fill: none; stroke: transparent; stroke-width: 22; cursor: pointer; }
#map .hitring:hover { stroke: rgba(255,255,255,.06); }
body.no-labels #map .label, body.no-labels #map .belt-label { display: none; }

.info-panel { margin-top: 1rem; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 1.25rem 1.5rem; }
.info-panel h3 { margin: 0 0 .5rem; font-size: 1.4rem; }
.info-panel p { margin: 0 0 .75rem; }
.facts { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: .5rem 1rem; margin: 0; }
.facts div { background: rgba(255,255,255,.04); border-radius: 8px; padding: .5rem .75rem; }
.facts dt { font-size: .75rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
.facts dd { margin: 0; font-weight: 500; }
.info-moons { margin: .75rem 0 0; color: var(--muted); }
.info-moons:empty { display: none; }
.card h4 { margin: 1rem 0 .4rem; font-size: .8rem; text-transform: uppercase; letter-spacing: .08em; color: var(--accent); font-weight: 600; }
.card ul.moons { list-style: none; padding: 0; }
.card ul.moons li { padding: .45rem 0; border-top: 1px solid var(--line); }
.card ul.moons strong { color: var(--text); }
.card ul.moons .dia { font-size: .78rem; color: var(--muted); margin-left: .3rem; }
#map .moon { pointer-events: none; }
.more-link { display: inline-block; margin-top: .75rem; color: var(--accent); }
.more-link[hidden] { display: none; }

.scale-bar { position: relative; height: 110px; margin: 1rem 0 2rem; border-top: 2px solid var(--line); }
.scale-bar .tick { position: absolute; top: -6px; width: 10px; height: 10px; border-radius: 50%; transform: translateX(-50%); }
.scale-bar .tick::after { content: ""; position: absolute; left: 4px; top: 10px; width: 1px; background: var(--line); height: var(--h, 8px); }
.scale-bar .tick span { position: absolute; left: 6px; top: calc(var(--h, 8px) + 8px); white-space: nowrap; font-size: .75rem; color: var(--muted); }
.scale-bar .tick.end span { left: auto; right: 6px; }
.scale-bar .row0 { --h: 8px; } .scale-bar .row1 { --h: 26px; } .scale-bar .row2 { --h: 44px; } .scale-bar .row3 { --h: 62px; } .scale-bar .row4 { --h: 80px; }

.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1.25rem; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 1.25rem 1.5rem; scroll-margin-top: 1rem; }
.card header { display: flex; align-items: center; gap: .9rem; margin-bottom: .6rem; }
.card .swatch { width: 40px; height: 40px; border-radius: 50%; flex: none; box-shadow: 0 0 12px rgba(255,255,255,.15); }
.card h3 { margin: 0; font-size: 1.25rem; }
.card .kind { color: var(--muted); font-size: .85rem; }
.card p { margin: .5rem 0; }
.card ul { padding-left: 1.2rem; margin: .5rem 0; color: var(--muted); font-size: .92rem; }
.card:target { border-color: var(--accent); }

/* nav */
.site-nav { display: flex; justify-content: center; gap: 2rem; padding: 1rem; border-bottom: 1px solid var(--line); font-size: .9rem; letter-spacing: .1em; text-transform: uppercase; }
.site-nav a { color: var(--muted); text-decoration: none; padding: .25rem 0; border-bottom: 2px solid transparent; }
.site-nav a:hover, .site-nav a.active { color: var(--text); border-color: var(--accent); }

/* trivia */
.trivia-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 1.25rem; }
.fact-box, .quiz-box { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 1.25rem 1.5rem; }
.fact-box h3, .quiz-box h3 { margin: 0 0 .5rem; font-size: .8rem; text-transform: uppercase; letter-spacing: .08em; color: var(--accent); }
#fact-text { font-size: 1.15rem; min-height: 4.5rem; }
.trivia-section button { background: var(--bg2); color: var(--text); border: 1px solid var(--line); border-radius: 6px; padding: .5rem .9rem; font: inherit; cursor: pointer; }
.trivia-section button:hover:not(:disabled) { border-color: var(--accent); }
.quiz-progress { color: var(--muted); font-size: .85rem; margin: 0 0 .25rem; }
.quiz-q { font-size: 1.15rem; margin: 0 0 .75rem; }
.quiz-answers { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: .5rem; margin-bottom: .75rem; }
.quiz-answers button { text-align: left; }
.quiz-answers button.right { border-color: #4fc27a; background: rgba(79,194,122,.15); }
.quiz-answers button.wrong { border-color: #e0564f; background: rgba(224,86,79,.15); }
.quiz-why { color: var(--muted); min-height: 2.5rem; margin: 0 0 .5rem; }

/* blog */
.post-list { display: grid; gap: 1.25rem; max-width: 800px; }
.post-list.compact { max-width: none; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.post-card { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 1.25rem 1.5rem; }
.post-card h2, .post-card h3 { margin: .25rem 0 .5rem; font-size: 1.3rem; }
.post-card a { color: var(--text); text-decoration: none; }
.post-card a:hover { color: var(--accent); }
.post-card .more-link { color: var(--accent); }
.post-meta { color: var(--muted); font-size: .85rem; margin: 0; }
.tag { color: var(--accent); text-transform: uppercase; letter-spacing: .06em; font-size: .75rem; }
.post-header h1 { text-transform: none; letter-spacing: 0; font-size: clamp(1.7rem, 4vw, 2.6rem); max-width: 40rem; margin: .5rem auto 0; }
.post { max-width: 720px; font-size: 1.05rem; }
.post h2 { font-size: 1.35rem; margin-top: 2rem; }
.post a { color: var(--accent); }
.post .back { margin-top: 3rem; color: var(--muted); }

.site-footer { text-align: center; color: var(--muted); font-size: .85rem; padding: 2rem 1rem; border-top: 1px solid var(--line); }

@media (max-width: 640px) {
  .map-controls .note { margin-left: 0; }
  #map .label { font-size: 18px; }
}
@media (prefers-reduced-motion: reduce) {
  #map .rotor { animation: none !important; }
}