/* Pluto & Moons */
:root{--bg:#050710;--bg2:#080c17;--card:rgba(14,21,36,.78);--card2:#0f1625;--text:#f1f5ff;--muted:#aab5ca;--line:rgba(255,255,255,.115);--accent:#91b9ff;--accent2:#cbd7ff;--max:1180px;--radius:24px;color-scheme:dark}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--text);background:radial-gradient(circle at 12% 8%,rgba(57,91,163,.22),transparent 28rem),radial-gradient(circle at 91% 28%,rgba(108,73,145,.16),transparent 31rem),linear-gradient(180deg,#04060c 0%,#090e19 48%,#050711 100%);min-height:100vh;line-height:1.65}
body::before{content:"";position:fixed;inset:0;pointer-events:none;opacity:.28;background-image:radial-gradient(circle,rgba(255,255,255,.65) 0 1px,transparent 1.25px),radial-gradient(circle,rgba(255,255,255,.25) 0 1px,transparent 1.25px);background-size:101px 101px,157px 157px;background-position:7px 15px,49px 83px;mask-image:linear-gradient(to bottom,#000,transparent 72%)}
a{color:inherit}img{max-width:100%;display:block}.container{width:min(calc(100% - 40px),var(--max));margin-inline:auto}.skip{position:absolute;left:-9999px}.skip:focus{left:16px;top:16px;z-index:999;background:white;color:black;padding:10px 14px;border-radius:8px}.eyebrow{text-transform:uppercase;letter-spacing:.18em;color:var(--accent);font-size:.76rem;font-weight:850}.section{padding:44px 0 72px}.section-heading{margin-bottom:24px}.section-heading h2,.panel h2,.resources-grid h2{font-size:clamp(1.65rem,3vw,2.35rem);line-height:1.1;letter-spacing:-.03em;margin:.2em 0}.split-heading{display:grid;grid-template-columns:.9fr 1.1fr;gap:42px;align-items:end}.split-heading>p{color:var(--muted);margin:0;max-width:48rem}
.site-header{position:sticky;top:0;z-index:80;background:rgba(4,6,12,.8);backdrop-filter:blur(18px);border-bottom:1px solid var(--line)}.header-inner{display:grid;grid-template-columns:auto 1fr;align-items:center;gap:30px;min-height:84px}.brand-row{display:flex;align-items:center;justify-content:space-between;gap:16px}.brand{display:flex;align-items:center;gap:11px;text-decoration:none;font-weight:850;letter-spacing:.02em;white-space:nowrap}.nav-toggle{display:none;background:none;color:var(--text);border:1px solid var(--line);padding:8px 11px;border-radius:10px;font:inherit}.nav-levels{display:grid;grid-template-columns:auto 1fr;gap:18px;align-items:center}.tier-label{display:block;color:#7f8ca5;text-transform:uppercase;letter-spacing:.12em;font-size:.64rem;font-weight:800;margin-bottom:4px}.primary-link{display:flex;align-items:baseline;gap:9px;text-decoration:none;border:1px solid rgba(145,185,255,.3);background:rgba(145,185,255,.09);padding:9px 13px;border-radius:13px;font-weight:820}.primary-link small{color:var(--muted);font-weight:600}.primary-link[aria-current=page]{background:rgba(145,185,255,.18);border-color:rgba(145,185,255,.55)}.moon-tier{border-left:1px solid var(--line);padding-left:18px}.moon-links{display:flex;gap:5px;flex-wrap:wrap}.moon-links a{text-decoration:none;color:var(--muted);padding:7px 10px;border-radius:10px;font-size:.91rem}.moon-links a:hover,.moon-links a[aria-current=page]{background:rgba(255,255,255,.08);color:var(--text)}
.hero{padding:70px 0 42px}.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:58px;align-items:center}.context-path{display:flex;align-items:center;gap:8px;color:#8794aa;font-size:.84rem;margin-bottom:14px}.context-parent{color:#bac8df;text-underline-offset:3px}h1{font-size:clamp(3.4rem,8vw,7rem);line-height:.86;letter-spacing:-.06em;margin:.12em 0 .22em}.lede{font-size:clamp(1.1rem,2.2vw,1.42rem);color:var(--muted);max-width:44rem;margin:0 0 28px}.actions{display:flex;flex-wrap:wrap;gap:12px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;text-decoration:none;font-weight:760;padding:11px 16px;border-radius:12px;border:1px solid var(--line);background:rgba(255,255,255,.055)}.btn:hover{background:rgba(255,255,255,.1)}.btn.primary{background:var(--text);color:#070a12;border-color:transparent}.hero-media{position:relative;margin:0}.hero-frame{background:linear-gradient(145deg,rgba(255,255,255,.09),rgba(255,255,255,.02));border:1px solid var(--line);padding:14px;border-radius:32px;box-shadow:0 28px 82px rgba(0,0,0,.4)}.hero-frame img{width:100%;aspect-ratio:1/1;object-fit:contain;background:#020307;border-radius:22px}.hero-frame img.moon-image{padding:10%}.caption{margin:10px 6px 0;color:#8490a7;font-size:.77rem}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:18px auto 58px}.stat{padding:19px;border:1px solid var(--line);border-radius:16px;background:rgba(255,255,255,.035)}.stat strong{display:block;font-size:1.04rem;margin-top:2px}.stat span{color:var(--muted);font-size:.76rem;text-transform:uppercase;letter-spacing:.08em}.section-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}.panel{border:1px solid var(--line);background:var(--card);border-radius:var(--radius);padding:clamp(24px,4vw,38px)}.accent-panel{background:linear-gradient(145deg,rgba(55,83,137,.22),rgba(14,21,36,.78))}.panel p,.resources-grid p{color:var(--muted)}.notice{margin-top:18px;padding:14px 16px;border-left:3px solid var(--accent);background:rgba(145,185,255,.07);color:var(--muted);border-radius:8px}
.model-section{padding-top:28px}.eyes-card{border:1px solid var(--line);border-radius:26px;overflow:hidden;background:#02040a;box-shadow:0 25px 80px rgba(0,0,0,.38)}.eyes-topbar{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:15px 18px;background:linear-gradient(90deg,#0e1627,#0a101d);border-bottom:1px solid var(--line)}.eyes-topbar strong,.eyes-topbar span{display:block}.eyes-topbar span{color:var(--muted);font-size:.76rem}.eyes-actions{display:flex;align-items:center;gap:14px;flex-wrap:wrap;justify-content:flex-end}.eyes-actions>a{font-size:.82rem;text-decoration:none;color:var(--accent2)}.live-time{font-variant-numeric:tabular-nums}.eyes-frame-wrap{position:relative;aspect-ratio:16/9;min-height:500px;background:#000}.eyes-frame{position:absolute;inset:0;width:100%;height:100%;border:0;background:#000}.eyes-help{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border-top:1px solid var(--line)}.eyes-help span{background:#0a101b;padding:11px 13px;color:#96a2b7;font-size:.75rem}.eyes-help kbd{font:inherit;color:#dce6fa;font-weight:750;background:rgba(255,255,255,.06);padding:2px 5px;border-radius:5px}.model-note{color:#7f8ba1;font-size:.8rem;margin:11px 4px 0}
.hierarchy-card{border:1px solid var(--line);border-radius:var(--radius);background:radial-gradient(circle at 50% 0%,rgba(145,185,255,.11),transparent 34rem),rgba(10,15,26,.75);padding:32px}.body-node{text-decoration:none;border:1px solid var(--line);background:rgba(255,255,255,.035);border-radius:16px;display:flex;align-items:center;gap:13px;transition:transform .2s ease,background .2s ease,border-color .2s ease}.body-node:hover{transform:translateY(-2px);background:rgba(255,255,255,.07)}.body-node strong{display:block}.body-node small{display:block;color:var(--muted);font-size:.72rem}.body-node.is-current{border-color:rgba(145,185,255,.7);box-shadow:0 0 0 1px rgba(145,185,255,.18),0 12px 35px rgba(51,86,147,.16)}.pluto-node{width:min(100%,390px);margin-inline:auto;padding:18px 20px;background:linear-gradient(145deg,rgba(145,185,255,.13),rgba(255,255,255,.035));font-size:1.08rem}.hierarchy-trunk{width:1px;height:30px;background:linear-gradient(var(--line),rgba(145,185,255,.55));margin:0 auto;position:relative}.hierarchy-trunk::after{content:"";position:absolute;left:50%;bottom:0;transform:translateX(-50%);width:75%;max-width:760px;min-width:280px;height:1px;background:var(--line)}.moon-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:10px;padding-top:18px}.moon-node{padding:13px}.scale-note{text-align:center;color:#748097;font-size:.73rem;margin:20px 0 0}
.resources-section{padding-top:18px}.resources-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:35px;align-items:center}.resource-links{display:grid;grid-template-columns:1fr 1fr;gap:12px}.resource-card{text-decoration:none;border:1px solid var(--line);border-radius:16px;padding:17px;background:rgba(255,255,255,.035)}.resource-card:hover{background:rgba(255,255,255,.07)}.resource-card span,.resource-card small{display:block;color:var(--muted);font-size:.74rem}.resource-card strong{display:block;margin:3px 0;font-size:1.06rem}footer{border-top:1px solid var(--line);padding:31px 0 48px;color:#8995aa;font-size:.85rem}.footer-grid{display:flex;justify-content:space-between;gap:22px;align-items:flex-start}.footer-grid p{margin:.25em 0}.footer-links{display:flex;gap:14px;flex-wrap:wrap}.footer-links a{color:#bdc9dd}
@media(max-width:900px){.header-inner{grid-template-columns:1fr;gap:0;min-height:68px}.brand-row{min-height:68px}.nav-toggle{display:block}.nav-levels{display:none;grid-template-columns:1fr;gap:13px;padding:0 0 16px}.nav-levels.open{display:grid}.moon-tier{border-left:0;border-top:1px solid var(--line);padding:12px 0 0}.hero{padding-top:48px}.hero-grid,.section-grid,.split-heading,.resources-grid{grid-template-columns:1fr}.hero-grid{gap:32px}.hero-media{max-width:650px;width:100%;margin-inline:auto}.stats{grid-template-columns:1fr 1fr}.split-heading{gap:10px;align-items:start}.moon-grid{grid-template-columns:repeat(3,1fr)}.hierarchy-trunk::after{min-width:180px;width:65%}.eyes-frame-wrap{min-height:430px}.eyes-help{grid-template-columns:1fr 1fr}}
@media(max-width:600px){.container{width:min(calc(100% - 24px),var(--max))}.hero{padding-top:34px}.stats{gap:9px;margin-bottom:42px}.stat{padding:15px}.moon-links{display:grid;grid-template-columns:1fr 1fr}.primary-link{justify-content:space-between}.eyes-topbar{align-items:flex-start;flex-direction:column}.eyes-actions{justify-content:flex-start}.eyes-frame-wrap{aspect-ratio:auto;height:68vh;min-height:440px}.eyes-help{grid-template-columns:1fr}.hierarchy-card{padding:20px 14px}.moon-grid{grid-template-columns:1fr 1fr}.hierarchy-trunk::after{display:none}.resource-links{grid-template-columns:1fr}.footer-grid{flex-direction:column}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.body-node{transition:none}}

/* v4: real astronomical imagery in branding and system hierarchy */
.brand-image{width:40px;height:40px;object-fit:cover;border-radius:50%;background:#020307;box-shadow:0 0 20px rgba(145,185,255,.18);flex:0 0 auto}
.nav-levels{justify-self:end}
.body-thumb{flex:0 0 auto;width:42px;height:42px;display:grid;place-items:center;background:#020307;border:1px solid rgba(255,255,255,.08);border-radius:12px;overflow:hidden}
.body-thumb img{width:100%;height:100%;object-fit:contain;display:block}
.pluto-node .body-thumb{width:58px;height:58px;border-radius:50%}
.pluto-node .body-thumb img{object-fit:cover}
@media(max-width:900px){.nav-levels{justify-self:stretch}.brand-image{width:36px;height:36px}}

/* v5: clearer current-object emphasis in the desktop/mobile system navigation */
.primary-link:not([aria-current="page"]){
  background:transparent;
  border-color:transparent;
  color:#a8b4c8;
  box-shadow:none;
}
.primary-link:not([aria-current="page"]) small{color:#7f8ca5}
.primary-link:not([aria-current="page"]):hover{background:rgba(255,255,255,.045);border-color:var(--line);color:var(--text)}
.moon-links a{border:1px solid transparent}
.moon-links a[aria-current="page"]{
  background:rgba(145,185,255,.18);
  color:var(--text);
  border-color:rgba(145,185,255,.55);
  box-shadow:0 0 0 1px rgba(145,185,255,.10),0 8px 24px rgba(51,86,147,.15);
  font-weight:800;
}