:root {
  color-scheme: light;
  --paper: #f4f1e8;
  --card: #fbf9f2;
  --ink: #293b2f;
  --muted: #67725f;
  --line: #d8dbcc;
  --soft: #e8ecdd;
  --gold: #a5814d;
  --serif: Georgia, "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --sans: Arial, "Microsoft YaHei", sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 28px; }
body { margin: 0; color: var(--ink); background: var(--paper); font: 14px/1.8 var(--sans); -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
button { color: inherit; font: inherit; cursor: pointer; }
button, a { -webkit-tap-highlight-color: transparent; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--gold); outline-offset: 5px; }
button:disabled { cursor: default; }
svg, canvas { display: block; max-width: 100%; }
h1, h2, h3, p, figure { margin: 0; }
h1, h2, h3 { font-family: var(--serif); font-weight: 400; }
.shell { width: min(100% - 100px, 1120px); margin-inline: auto; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; top: -100px; left: 20px; z-index: 10; padding: 12px 18px; background: var(--ink); color: var(--paper); }
.skip-link:focus { top: 12px; }
.site-header { min-height: 106px; display: flex; align-items: center; gap: 36px; border-bottom: 1px solid var(--line); }
.brand { display: flex; flex: 0 0 auto; align-items: center; gap: 11px; font: 23px/1.1 var(--serif); }
.brand-mark { display: grid; place-items: center; width: 38px; height: 43px; border: 1px solid var(--ink); border-radius: 20px 20px 3px 3px; font-size: 24px; }
.brand small { display: block; margin-top: 7px; color: var(--muted); font: 7px/1 var(--sans); letter-spacing: 1.8px; }
.site-nav { display: flex; align-items: center; gap: 30px; margin-left: auto; font-size: 13px; }
.site-nav a { position: relative; display: flex; align-items: center; min-height: 44px; }
.site-nav a::after { position: absolute; content: ""; bottom: 3px; left: 0; right: 0; height: 1px; background: var(--ink); transform: scaleX(0); transform-origin: left; transition: transform .2s; }
.site-nav a:hover::after, .site-nav a[aria-current="page"]::after { transform: scaleX(1); }
.header-note { padding-left: 30px; border-left: 1px solid var(--line); font-size: 10px; color: var(--muted); letter-spacing: 1px; }
.hero { display: grid; grid-template-columns: 1.04fr 1fr; align-items: center; gap: 38px; padding: 66px 0 62px; }
.eyebrow { color: var(--muted); font-size: 10px; letter-spacing: 1.9px; line-height: 1.8; }
.hero .eyebrow { display: flex; align-items: center; gap: 10px; }
.tiny-star { color: var(--gold); font-size: 19px; line-height: 1; }
h1 { margin: 21px 0 21px; font-size: clamp(40px, 4.4vw, 57px); line-height: 1.42; letter-spacing: .4px; }
h1 em { color: #73825b; font-style: normal; }
.hero-description { color: var(--muted); font-size: 13px; line-height: 2.1; }
.mobile-break { display: none; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 23px; margin-top: 30px; font-size: 12px; }
.button { display: inline-flex; align-items: center; gap: 30px; min-height: 49px; padding: 12px 19px; background: var(--ink); color: var(--paper); border: 1px solid var(--ink); border-radius: 3px; transition: background .2s; }
.button:hover { background: #42563e; }
.text-link { display: inline-flex; align-items: center; min-height: 44px; gap: 18px; font-size: 12px; }
.text-link:hover { text-decoration: underline; text-underline-offset: 6px; }
.desk-illustration { align-self: center; }
.desk-drawing { width: 100%; height: auto; }
.desk-illustration figcaption { display: flex; justify-content: center; align-items: center; gap: 14px; margin: 0 0 0 17px; font-size: 10px; letter-spacing: 1px; color: var(--muted); }
.caption-line { display: inline-block; height: 1px; width: 28px; background: #a2ae91; }
.daily-section { border-top: 1px solid var(--line); padding-top: 25px; }
.section-kicker { display: flex; justify-content: space-between; gap: 20px; align-items: center; }
.section-kicker h2 { font-size: 17px; }
.section-kicker > span { color: var(--muted); font-size: 8px; letter-spacing: 1.6px; }
.daily-routes { display: grid; grid-template-columns: repeat(3, 1fr); padding-top: 31px; }
.route { display: flex; flex-direction: column; padding: 0 35px 5px; border-left: 1px solid var(--line); }
.route:first-child { padding-left: 0; border: 0; }
.route:last-child { padding-right: 0; }
.route-number { color: var(--muted); font-size: 9px; letter-spacing: 1.7px; }
.route-title { display: flex; align-items: center; justify-content: space-between; gap: 18px; margin: 11px 0; }
.route-title h3 { font-size: 27px; }
.route-title > span { display: grid; place-items: center; width: 32px; height: 32px; border: 1px solid var(--line); border-radius: 50%; color: var(--muted); transition: background .2s, color .2s; }
.route:hover .route-title > span { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.route p { font-size: 12px; line-height: 2; color: var(--muted); }
.route-action { display: flex; align-items: center; justify-content: space-between; gap: 15px; font-size: 11px; margin-top: 23px; }
.route:hover .route-action, .blackhole-entry:hover .route-action { text-decoration: underline; text-underline-offset: 5px; }
.explore-section { padding: 66px 0 0; margin-top: 58px; border-top: 1px solid var(--line); }
.section-heading { display: flex; align-items: flex-end; justify-content: space-between; gap: 32px; margin-bottom: 30px; }
.section-heading h2 { font-size: 33px; margin-top: 10px; line-height: 1.65; }
.section-heading > p { font-size: 12px; color: var(--muted); line-height: 2; }
.experiment-layout { display: grid; grid-template-columns: 1.55fr 1fr; gap: 24px; }
.particle-experiment { position: relative; min-width: 0; color: #e5eadb; background: #263d31; border: 1px solid #263d31; border-radius: 4px; overflow: hidden; }
.experiment-meta { display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 21px 24px; font-size: 10px; letter-spacing: 1px; line-height: 1.5; }
.particle-experiment .experiment-meta { color: #c3cdb7; }
.meta-divider { padding: 0 10px; opacity: .55; }
#form-name { font: 8px/1.5 var(--sans); letter-spacing: 2px; }
.universe { height: 275px; position: relative; }
#universe { width: 100%; height: 100%; }
.canvas-cross { position: absolute; color: #829779; font: 14px var(--sans); pointer-events: none; }
.cross-one { left: 27px; top: 35px; }
.cross-two { right: 27px; bottom: 35px; }
.particle-controls { display: flex; justify-content: space-between; gap: 12px; align-items: center; padding: 16px 20px; border-top: 1px solid #52634c; }
.modes { display: flex; align-items: center; gap: 7px; }
.modes button { min-width: 58px; min-height: 44px; border: 1px solid transparent; border-radius: 3px; background: none; font-size: 12px; }
.modes button:hover { background: #3f5541; }
.modes button[aria-pressed="true"] { border-color: #9caf87; background: #3b513c; }
.motion-toggle { display: inline-flex; align-items: center; gap: 7px; min-height: 44px; padding: 0 4px; border: 0; background: none; color: #cbd4be; font-size: 10px; }
.motion-toggle:hover { color: #fff; }
.motion-symbol { font-size: 16px; }
.blackhole-entry { display: flex; flex-direction: column; min-width: 0; border: 1px solid var(--line); border-radius: 4px; background: #ebeede; overflow: hidden; }
.blackhole-entry .experiment-meta { color: var(--muted); }
.blackhole-art { position: relative; height: 156px; margin: 4px 0 6px; overflow: hidden; }
.blackhole-grid { position: absolute; width: 210px; height: 210px; border: 1px solid #d2d9c5; border-radius: 50%; top: -27px; left: calc(50% - 105px); }
.blackhole-grid::after, .blackhole-grid::before { content: ""; position: absolute; background: #d2d9c5; }
.blackhole-grid::after { width: 1px; height: 210px; left: 50%; }
.blackhole-grid::before { width: 210px; height: 1px; top: 50%; }
.blackhole-core { position: absolute; width: 87px; height: 87px; left: calc(50% - 43.5px); top: 35px; border-radius: 50%; background: #344a37; box-shadow: 0 0 0 7px #c6cfb2, 0 0 0 8px #a7b58e, 0 0 0 14px #e2e6d3; }
.blackhole-orbit { position: absolute; z-index: 1; width: 236px; height: 62px; left: calc(50% - 118px); top: 49px; border: 1px solid #a58d5b; border-radius: 50%; transform: rotate(-21deg); }
.orbit-two { width: 270px; height: 84px; left: calc(50% - 135px); top: 38px; border-color: #b9c3a2; }
.blackhole-star { position: absolute; color: #899874; right: 50px; top: 15px; font-size: 19px; }
.blackhole-copy { padding: 0 27px 22px; }
.blackhole-copy h3 { font-size: 26px; }
.blackhole-copy p { margin-top: 6px; font-size: 12px; line-height: 1.9; color: var(--muted); }
.blackhole-copy .route-action { margin-top: 20px; }
.experiment-note { color: var(--muted); margin-top: 17px; font-size: 10px; }
.about-section { display: grid; grid-template-columns: 1.25fr 1fr; gap: 52px; align-items: center; padding: 57px 0 60px; margin-top: 60px; border-top: 1px solid var(--line); }
.about-copy h2 { font-size: 29px; line-height: 1.6; margin: 12px 0 18px; }
.about-copy > p:not(.eyebrow) { color: var(--muted); font-size: 12px; line-height: 2.1; margin-top: 12px; }
.about-copy .text-link { margin-top: 15px; }
.ripple-panel { position: relative; min-height: 270px; border-left: 1px solid var(--line); }
#ripples { width: 100%; height: 240px; }
.ripple-caption { position: absolute; width: 100%; top: 78px; text-align: center; pointer-events: none; font: 22px/1.8 var(--serif); }
.ripple-caption small { display: block; color: var(--muted); font: 9px/2 var(--sans); letter-spacing: 2px; }
#ripple-trigger { display: flex; min-height: 44px; align-items: center; justify-content: center; gap: 24px; margin: -7px auto 0; border: 0; background: none; color: var(--muted); font-size: 11px; }
#ripple-trigger:hover { color: var(--ink); }
.site-footer { padding-top: 26px; padding-bottom: 24px; border-top: 1px solid var(--line); }
.footer-top { display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.footer-brand { font: 22px var(--serif); }
.footer-brand small { margin-left: 9px; color: var(--muted); font: 7px var(--sans); letter-spacing: 2px; }
.footer-top p, .back-top { color: var(--muted); font-size: 10px; }
.back-top { display: inline-flex; min-height: 44px; align-items: center; gap: 14px; }
.footer-bottom { display: flex; flex-wrap: wrap; align-items: center; gap: 21px; margin-top: 14px; color: var(--muted); font-size: 9px; }
.footer-time { margin-left: auto; }
.footer-time time { margin-left: 5px; font-variant-numeric: tabular-nums; }
.footer-icp:hover { text-decoration: underline; text-underline-offset: 4px; }
@media (max-width: 1000px) {
  .shell { width: calc(100% - 64px); }
  .header-note { display: none; }
  .hero { gap: 20px; padding-top: 52px; }
  h1 { font-size: 44px; }
  .route { padding-inline: 25px; }
  .route-title h3 { font-size: 24px; }
  .experiment-layout { grid-template-columns: 1.4fr 1fr; gap: 18px; }
  .particle-controls { padding-inline: 13px; gap: 4px; }
  .modes { gap: 2px; }
  .modes button { min-width: 49px; }
  .blackhole-copy { padding-inline: 23px; }
  .about-section { gap: 25px; }
}
@media (max-width: 720px) {
  .shell { width: calc(100% - 44px); }
  .site-header { min-height: 88px; gap: 22px; }
  .brand { font-size: 21px; gap: 9px; }
  .brand-mark { width: 34px; height: 39px; font-size: 22px; }
  .site-nav { gap: 22px; font-size: 12px; }
  .hero { grid-template-columns: 1fr; gap: 18px; padding: 40px 0 36px; }
  h1 { font-size: clamp(37px, 6.5vw, 51px); margin-top: 17px; }
  .hero-description { font-size: 12px; }
  .hero-actions { margin-top: 24px; }
  .desk-illustration { width: min(100%, 420px); margin: 0 auto; }
  .desk-illustration figcaption { font-size: 9px; margin-top: -2px; }
  .daily-section { padding-top: 22px; }
  .daily-routes { grid-template-columns: 1fr; padding-top: 8px; }
  .route, .route:first-child, .route:last-child { padding: 24px 0; border: 0; border-bottom: 1px solid var(--line); }
  .route:last-child { border-bottom: 0; padding-bottom: 0; }
  .route-title { margin: 5px 0 7px; }
  .route-title h3 { font-size: 27px; }
  .route-action { margin-top: 14px; }
  .section-kicker h2 { font-size: 16px; }
  .section-kicker > span { font-size: 7px; letter-spacing: 1.1px; }
  .explore-section { padding-top: 36px; margin-top: 40px; }
  .section-heading { display: block; margin-bottom: 23px; }
  .section-heading h2 { font-size: 28px; }
  .section-heading > p { margin-top: 13px; font-size: 11px; }
  .experiment-layout { grid-template-columns: 1fr; gap: 19px; }
  .universe { height: 255px; }
  .experiment-meta { padding: 18px 20px; }
  .particle-controls { padding: 13px 17px; }
  .modes { gap: 6px; }
  .modes button { min-width: 53px; }
  .blackhole-entry { display: grid; grid-template-columns: 1fr 1fr; }
  .blackhole-entry .experiment-meta { grid-column: 1 / -1; }
  .blackhole-art { height: 170px; margin: 0; }
  .blackhole-grid { width: 170px; height: 170px; top: 0; left: calc(50% - 85px); }
  .blackhole-grid::after { height: 170px; }
  .blackhole-grid::before { width: 170px; }
  .blackhole-core { width: 65px; height: 65px; left: calc(50% - 32.5px); top: 53px; }
  .blackhole-orbit { width: 157px; height: 43px; left: calc(50% - 78.5px); top: 64px; }
  .orbit-two { width: 178px; height: 62px; left: calc(50% - 89px); top: 53px; }
  .blackhole-star { right: 20px; top: 25px; }
  .blackhole-copy { padding: 12px 19px 22px 9px; }
  .blackhole-copy h3 { font-size: 23px; }
  .blackhole-copy p { font-size: 11px; }
  .experiment-note { line-height: 1.9; }
  .about-section { grid-template-columns: 1fr; gap: 20px; padding: 36px 0; margin-top: 40px; }
  .about-copy h2 { font-size: 27px; }
  .ripple-panel { border-left: 0; border-top: 1px solid var(--line); padding-top: 10px; min-height: 260px; }
  .ripple-caption { top: 87px; }
  .footer-top { gap: 15px; flex-wrap: wrap; }
  .footer-top p { display: none; }
  .footer-bottom { gap: 12px 20px; }
  .footer-icp { flex-basis: 100%; }
}
@media (max-width: 360px) {
  .shell { width: calc(100% - 44px); }
  .site-header { gap: 15px; }
  .site-nav { gap: 17px; }
  h1 { font-size: 34px; }
  .eyebrow { font-size: 9px; letter-spacing: 1.5px; }
  .hero-description { font-size: 11px; }
  .mobile-break { display: inline; }
  .hero-actions { gap: 15px; }
  .button { padding-inline: 15px; gap: 20px; }
  .text-link { font-size: 11px; gap: 10px; }
  .section-kicker > span { letter-spacing: .5px; }
  .section-heading h2 { font-size: 25px; }
  .particle-controls { padding-inline: 10px; }
  .modes { gap: 2px; }
  .modes button { min-width: 47px; }
  .motion-toggle { font-size: 9px; gap: 4px; }
  .blackhole-copy h3 { font-size: 20px; }
  .blackhole-copy { padding-right: 14px; }
  .about-copy h2 { font-size: 25px; }
  .about-copy > p:not(.eyebrow) { font-size: 11px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}