:root {
  color-scheme: dark;
  --space: #040b11;
  --paper: #f5f0e5;
  --gold: #dcb36c;
  --muted: #9aadb1;
  --line: rgba(220, 179, 108, .2);
  --center-x: 62%;
  --satellite-radius: min(18.5vw, 267px);
  --serif: "Yu Mincho", "Hiragino Mincho ProN", Georgia, serif;
  --sans: Inter, "Yu Gothic UI", "Hiragino Kaku Gothic ProN", sans-serif;
}

* { box-sizing: border-box; }
html, body { min-width: 320px; min-height: 100%; }
body { margin: 0; overflow: hidden; color: var(--paper); background: var(--space); font-family: var(--sans); }
body::before { position: fixed; z-index: -3; inset: 0; background: url("assets/cosmic-atlas-backdrop.png") center / cover no-repeat; content: ""; }
button, a { font: inherit; -webkit-tap-highlight-color: transparent; }
button { color: inherit; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; }
.space-haze { position: fixed; z-index: -2; inset: 0; pointer-events: none; background: linear-gradient(90deg, rgba(3,10,15,.88) 0%, rgba(3,10,15,.58) 34%, rgba(3,10,15,.28) 70%, rgba(3,10,15,.48) 100%), linear-gradient(0deg, rgba(3,10,15,.75), transparent 45%); }
#starfield { position: fixed; z-index: -1; inset: 0; width: 100%; height: 100%; pointer-events: none; }

.site-header, .site-footer { position: fixed; z-index: 30; right: 0; left: 0; display: flex; align-items: center; justify-content: space-between; background: rgba(3,10,15,.38); backdrop-filter: blur(8px); }
.site-header { top: 0; padding: 1.35rem clamp(1.2rem,3vw,3rem); border-bottom: 1px solid var(--line); }
.site-header > p, .site-footer { color: var(--muted); font-size: .56rem; letter-spacing: .22em; }
.wordmark { display: flex; align-items: center; color: inherit; text-decoration: none; }
.wordmark > span:last-child { display: grid; line-height: 1.2; letter-spacing: .15em; }
.wordmark strong { color: var(--gold); font-size: .72rem; }
.wordmark small { color: var(--muted); font-family: var(--serif); font-size: .53rem; letter-spacing: .1em; }

.universe { position: relative; width: 100vw; height: 100svh; min-height: 580px; overflow: hidden; }
.system-stage { position: absolute; inset: 0; }
.orbit { position: absolute; z-index: 0; top: 50%; left: var(--center-x); aspect-ratio: 1; border: 1px solid rgba(220,179,108,.17); border-radius: 50%; transform: translate(-50%,-50%); pointer-events: none; transition: border-color .6s ease; }
.orbit-one { width: min(27vw, 390px); }
.orbit-two { width: min(46vw, 660px); }
.orbit-three { width: min(66vw, 950px); }
.orbit-detail { z-index: 7; width: calc(var(--satellite-radius) * 2); border-color: rgba(211,225,237,.3); border-style: dashed; visibility: hidden; }
.orbit-detail::before { position: absolute; inset: 7%; border: 1px solid rgba(211,225,237,.1); border-radius: 50%; content: ""; }

.celestial { position: absolute; z-index: 5; padding: 0; border: 0; background: transparent; cursor: pointer; }
.celestial:focus-visible { outline: 1px solid var(--gold); outline-offset: 10px; border-radius: 50%; }
.core-star { top: 50%; left: var(--center-x); width: clamp(190px,17vw,250px); aspect-ratio: 1; transform: translate(-50%,-50%); transition: left 1.35s cubic-bezier(.16,.78,.2,1), width 1.35s cubic-bezier(.16,.78,.2,1), transform 1.35s cubic-bezier(.16,.78,.2,1); }
.star-corona { position: absolute; inset: -10%; border-radius: 50%; background: transparent; opacity: .58; animation: coronaTurn 42s linear infinite; }
.star-corona::before, .star-corona::after { position: absolute; border: 1px solid rgba(174,53,56,.34); border-radius: 50%; content: ""; }
.star-corona::before { inset: 2% -8% 34% 19%; border-right-color: transparent; border-bottom-color: transparent; transform: rotate(31deg); }
.star-corona::after { inset: 38% 12% -9% -5%; border-top-color: transparent; border-left-color: transparent; transform: rotate(-24deg); }
.star-body { position: absolute; inset: 9%; border-radius: 50%; background: transparent; }
.solar-ring { position: absolute; inset: 0; display: block; border: 1px solid var(--solar-ring-color); border-radius: 50%; background: transparent; }
.solar-ring-one { --solar-ring-color: rgba(192,58,55,.76); transform: translate(-5%,1%); }
.solar-ring-two { --solar-ring-color: rgba(152,39,50,.68); transform: translate(4%,-3%); }
.solar-ring-three { --solar-ring-color: rgba(220,83,66,.56); transform: translate(1%,5%); }
.solar-ring-four { --solar-ring-color: rgba(116,31,45,.72); transform: translate(-2%,-5%); }
.solar-ring-five { --solar-ring-color: rgba(177,48,43,.46); transform: translate(6%,2%); }
.solar-ring-six { --solar-ring-color: rgba(231,111,91,.38); transform: translate(-6%,-2%); }
.core-copy { position: absolute; z-index: 2; inset: 0; display: grid; align-content: center; justify-items: center; text-align: center; pointer-events: none; }
.core-copy small, .core-copy em { color: rgba(225,129,119,.88); font-size: clamp(.4rem,.55vw,.52rem); font-style: normal; letter-spacing: .16em; }
.core-copy strong { margin: .25rem 0; color: var(--paper); font-family: var(--serif); font-size: clamp(1.05rem,1.6vw,1.5rem); line-height: 1.05; text-shadow: 0 1px 5px rgba(2,7,13,.9); }
.core-copy em { visibility: hidden; }

.planet-system { position: absolute; inset: 0; }
.planet-cluster { position: absolute; z-index: 6; width: 0; height: 0; transition: opacity .5s ease, transform 1s cubic-bezier(.2,.8,.2,1); }
.planet { top: 0; left: 0; width: var(--planet-size); aspect-ratio: 1; transform: translate(-50%,-50%); transition: width 1s cubic-bezier(.2,.8,.2,1), transform 1s cubic-bezier(.2,.8,.2,1); }
.cluster-game { --planet-size: clamp(88px,8vw,116px); --mini-orbit: clamp(68px,6.2vw,90px); }
.cluster-archive { --planet-size: clamp(78px,7vw,102px); --mini-orbit: clamp(61px,5.6vw,82px); }
.cluster-life { --planet-size: clamp(70px,6.2vw,92px); --mini-orbit: clamp(55px,5vw,74px); }
.planet-surface { position: absolute; inset: 0; overflow: hidden; border: 1px solid rgba(219,232,244,.62); border-radius: 50%; background: rgba(5,14,21,.06); }
.planet-game .planet-surface { border-color: rgba(151,196,235,.72); }
.planet-archive .planet-surface { border-color: rgba(199,169,231,.72); }
.planet-life .planet-surface { border-color: rgba(137,211,206,.72); }
.planet-ring { display: none; }
.celestial-label { position: absolute; top: 50%; left: calc(100% + .85rem); display: grid; min-width: max-content; text-align: left; transform: translateY(-50%); pointer-events: none; }
.planet-archive .celestial-label { right: calc(100% + .85rem); left: auto; text-align: right; }
.celestial-label small { color: var(--gold); font-size: .6rem; letter-spacing: .13em; }
.celestial-label strong { font-family: var(--serif); font-size: clamp(1rem,1.35vw,1.2rem); font-weight: 500; letter-spacing: .065em; }
.celestial-label em { margin-top: .12rem; color: var(--muted); font-size: .54rem; font-style: normal; letter-spacing: .11em; }

.cluster-satellites { position: absolute; z-index: 7; top: 0; left: 0; width: 0; height: 0; pointer-events: none; }
.satellite { top: 0; left: 0; width: calc(clamp(11px,.9vw,15px) * var(--sat-size,1)); aspect-ratio: 1; color: inherit; text-decoration: none; pointer-events: none; animation: satelliteOrbit var(--sat-duration) linear infinite var(--sat-direction,normal); }
.satellite-content { position: absolute; inset: 0; animation: satelliteCounterOrbit var(--sat-duration) linear infinite var(--sat-direction,normal); }
.satellite-art { position: absolute; inset: 0; overflow: hidden; border: 1px solid var(--satellite-line, rgba(220,235,247,.58)); border-radius: 50%; background: rgba(5,14,21,.04); transition: transform .25s ease; }
.satellite:hover .satellite-art, .satellite:focus-visible .satellite-art { transform: scale(1.06); }
.satellite:hover, .satellite:focus-visible, .satellite.is-paused, .satellite:hover .satellite-content, .satellite:focus-visible .satellite-content, .satellite.is-paused .satellite-content { animation-play-state: paused; }
.satellite .celestial-label { display: none; top: calc(100% + .65rem); left: 50%; text-align: center; transform: translateX(-50%); }
.tone-oath { --satellite-line: rgba(180,196,244,.72); }
.tone-metropolis { --satellite-line: rgba(224,190,126,.72); }
.tone-rune { --satellite-line: rgba(208,166,220,.72); }
.tone-vault { --satellite-line: rgba(213,190,142,.72); }
.tone-bousai { --satellite-line: rgba(141,215,202,.72); }
.tone-moon { --satellite-line: rgba(178,190,230,.76); }
.tone-strategy { --satellite-line: rgba(126,183,211,.76); }
.tone-banknote { --satellite-line: rgba(155,195,148,.76); }
.tone-autodouga { --satellite-line: rgba(200,142,179,.76); }

.system-guide { position: absolute; z-index: 12; top: 50%; left: clamp(1.5rem,5vw,5rem); width: min(35vw,470px); padding-left: 1.25rem; border-left: 1px solid rgba(220,179,108,.48); transform: translateY(-50%); }
.guide-index { margin: 0 0 .75rem; color: var(--gold); font-size: .64rem; letter-spacing: .17em; }
.system-guide h2 { margin: 0; font-family: var(--serif); font-size: clamp(1.6rem,2.7vw,2.8rem); font-weight: 400; line-height: 1.3; }
.system-guide h2 span { white-space: nowrap; }
.system-guide > p:last-of-type { max-width: none; margin: 1rem 0; color: #bdc8c7; font-family: var(--serif); font-size: .9rem; line-height: 1.9; white-space: nowrap; }
.back-button { margin-top: .6rem; padding: .55rem 0; color: var(--gold); background: none; border: 0; font-size: .72rem; cursor: pointer; }
.back-button span { margin-right: .55rem; }
.coordinate { position: absolute; z-index: 10; right: clamp(1.2rem,3vw,3rem); bottom: 3.4rem; margin: 0; color: rgba(184,199,200,.65); font-size: .48rem; line-height: 1.8; letter-spacing: .13em; text-align: right; }
.site-footer { bottom: 0; padding: .75rem clamp(1.2rem,3vw,3rem); border-top: 1px solid var(--line); }

body.is-focused .core-star { position: fixed; z-index: 5; left: calc(180% - clamp(220px,22vw,320px)); width: 160vw; transform: translate(-50%,-50%); }
body.is-focused .core-star::after { position: absolute; top: 50%; left: clamp(18px,3vw,44px); width: clamp(16px,2vw,28px); aspect-ratio: 1; border: 1px solid rgba(244,207,144,.68); border-radius: 50%; content: ""; transform: translate(-35%,-50%); animation: returnPulse 2.4s ease-in-out infinite; }
body.is-focused .core-copy { inset: 0 auto 0 0; width: auto; padding-left: clamp(52px,6vw,88px); align-content: center; justify-items: start; text-align: left; transform: none; }
body.is-focused .core-copy small, body.is-focused .core-copy strong { visibility: hidden; }
body.is-focused .core-copy em { visibility: visible; color: var(--gold); }
body.is-focused .orbit-detail { visibility: visible; }
body.is-focused .orbit-detail { border-color: rgba(48,27,13,.34); }
body.is-focused .orbit-detail::before { border-color: rgba(48,27,13,.16); }
body.is-focused .satellite .celestial-label, body.is-focused .planet.is-selected .celestial-label { color: var(--paper); text-shadow: 0 1px 5px rgba(2,7,13,.9); }
body.is-focused .satellite .celestial-label small, body.is-focused .satellite .celestial-label em, body.is-focused .planet.is-selected .celestial-label small, body.is-focused .planet.is-selected .celestial-label em { color: var(--gold); }
body.is-focused .planet-cluster:not(:has(.planet.is-selected)) { opacity: 0; pointer-events: none; transform: scale(.55); }
body.is-focused .planet-cluster { transition: left 1s cubic-bezier(.2,.8,.2,1), top 1s cubic-bezier(.2,.8,.2,1), opacity .5s ease, transform 1s cubic-bezier(.2,.8,.2,1); }
body.is-focused .planet.is-selected { z-index: 8; width: clamp(122px,11vw,158px); pointer-events: none; }
body.is-focused .planet.is-selected .celestial-label { top: calc(100% + .5rem); right: auto; left: 50%; text-align: center; transform: translateX(-50%); }
body.is-focused .planet.is-selected + .cluster-satellites { pointer-events: auto; }
body.is-focused .planet-cluster:has(.planet.is-selected) { --mini-orbit: var(--satellite-radius); }
body.is-focused .planet.is-selected + .cluster-satellites .satellite { width: calc(clamp(42px,3.8vw,56px) * var(--sat-size,1)); pointer-events: auto; }
body.is-focused .planet.is-selected + .cluster-satellites .satellite .celestial-label { display: grid; }

@keyframes satelliteOrbit { from { transform: translate(-50%,-50%) rotate(var(--sat-start)) translateX(calc(var(--mini-orbit) + var(--sat-orbit-offset,0px))); } to { transform: translate(-50%,-50%) rotate(calc(var(--sat-start) + 360deg)) translateX(calc(var(--mini-orbit) + var(--sat-orbit-offset,0px))); } }
@keyframes satelliteCounterOrbit { from { transform: rotate(var(--sat-counter-start)); } to { transform: rotate(calc(var(--sat-counter-start) - 360deg)); } }
@keyframes coronaTurn { to { transform: rotate(360deg); } }
@keyframes returnPulse { 0%,100% { opacity: .28; box-shadow: 0 0 0 0 rgba(224,176,103,.22); transform: translate(-35%,-50%) scale(.8); } 50% { opacity: .9; box-shadow: 0 0 0 14px rgba(224,176,103,0); transform: translate(-35%,-50%) scale(1.16); } }

@media (max-width: 860px) {
  :root { --center-x: 55%; --satellite-radius: min(30vw, 225px); }
  .orbit-one { width: min(46vw,390px); }
  .orbit-two { width: min(72vw,610px); }
  .orbit-three { width: min(105vw,850px); }
  .system-guide { top: auto; right: 1.2rem; bottom: 3.5rem; left: 1.2rem; width: auto; transform: none; }
  .system-guide h2 { font-size: 1.35rem; }
  .system-guide > p:last-of-type { display: none; }
  .coordinate { display: none; }
}

@media (max-width: 600px) {
  :root { --center-x: 50%; --satellite-radius: min(34vw, 145px); }
  .site-header > p { display: none; }
  .universe { min-height: 640px; }
  .core-star { width: 165px; }
  body.is-focused .core-star { left: calc(180% - 140px); width: 160vw; }
  .cluster-game { --planet-size: 76px; --mini-orbit: 54px; }
  .cluster-archive { --planet-size: 68px; --mini-orbit: 49px; }
  .cluster-life { --planet-size: 61px; --mini-orbit: 44px; }
  .celestial-label, .planet-archive .celestial-label { top: calc(100% + .4rem); right: auto; left: 50%; text-align: center; transform: translateX(-50%); }
  .celestial-label em { display: none; }
  .satellite { width: calc(9px * var(--sat-size,1)); }
  body.is-focused .planet.is-selected + .cluster-satellites .satellite { width: calc(40px * var(--sat-size,1)); }
  .satellite .celestial-label { width: 128px; min-width: 0; }
  .celestial-label small { font-size: .55rem; }
  .celestial-label strong { font-size: .94rem; }
  .celestial-label em { font-size: .5rem; }
  .satellite .celestial-label strong { overflow-wrap: anywhere; font-size: .72rem; line-height: 1.25; }
  .system-guide { bottom: 3rem; }
  .guide-index { margin-bottom: .25rem; }
  .system-guide h2 { font-size: 1.15rem; }
  .system-guide h2 span { white-space: nowrap; }
  .site-footer span:first-child { display: none; }
  .site-footer { justify-content: flex-end; }
}

@media (prefers-reduced-motion: reduce) { *,*::before,*::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; } }