:root{color-scheme:dark;--bg:#080d1c;--ink:#f2f6ff;--muted:#a8b8ce;--cyan:#65e9ed;--purple:#b6a0fb;--line:#293448}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:28px}body{margin:0;background:var(--bg);color:var(--ink);font-family:Arial,Helvetica,sans-serif;line-height:1.6;background-image:radial-gradient(ellipse at 75% 8%,#25224388,transparent 35%)}a{color:inherit;text-decoration:none}a:hover{color:var(--cyan)}a:focus-visible{outline:3px solid var(--cyan);outline-offset:6px}img{max-width:100%;display:block}.wrap{width:min(1160px,calc(100% - 64px));margin-inline:auto}.skip{position:absolute;top:-80px;z-index:9;background:var(--cyan);color:var(--bg);padding:12px}.skip:focus{top:0}.nav{display:flex;align-items:center;justify-content:space-between;padding:30px 0}.brand{display:flex;align-items:center;gap:12px;font-weight:700;font-size:18px;letter-spacing:-.5px}.brand img{border-radius:10px}.nav nav{display:flex;gap:32px;font-size:13px;align-items:center}.nav-cta{border-bottom:1px solid var(--line);padding:8px 0}.hero{display:grid;grid-template-columns:1.15fr 1fr;gap:32px;align-items:center;padding:64px 0 96px;min-height:690px}.eyebrow{font-size:10px;letter-spacing:2.2px;font-weight:700;color:var(--cyan);display:flex;align-items:center;gap:10px}.status{display:inline-block;width:6px;height:6px;border-radius:100%;background:var(--cyan);box-shadow:0 0 14px var(--cyan)}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(45px,5.8vw,76px);line-height:1.06;letter-spacing:-3.8px;margin:26px 0}h1 em{font-style:normal;color:var(--purple)}.lead{font-size:18px;max-width:410px;color:var(--muted);margin:26px 0 35px}.actions{display:flex;align-items:center;gap:25px}.button{display:inline-flex;justify-content:center;align-items:center;gap:28px;background:var(--cyan);color:#08151d;border-radius:8px;padding:15px 22px;font-size:13px;font-weight:700}.button:hover{color:#08151d;background:#affaff}.platforms{font-size:9px;color:var(--muted);letter-spacing:1px;line-height:1.8}.platforms strong{font-size:12px;font-weight:400;letter-spacing:0;color:var(--ink)}.hero-notes{display:flex;gap:25px;margin-top:44px;color:var(--muted);font-size:11px}.hero-notes span:before{content:'✦';color:var(--purple);margin-right:8px}.hero-art{position:relative;height:500px;display:flex;align-items:center;justify-content:center}.hero-art img{height:100%;width:100%;object-fit:cover;border-radius:46% 46% 18% 18%;mask-image:linear-gradient(black 82%,transparent);opacity:.9}.orbit{position:absolute;border:1px solid #a99fff26;border-radius:50%;pointer-events:none;z-index:1}.orbit-one{width:110%;height:70%;transform:rotate(-32deg)}.orbit-two{width:105%;height:55%;transform:rotate(28deg)}.art-caption{position:absolute;bottom:-20px;display:flex;align-items:center;gap:10px;font-size:8px;letter-spacing:2px;color:var(--muted)}.ticker{display:flex;justify-content:center;gap:38px;align-items:center;padding:22px 24px;border-block:1px solid var(--line);font-size:10px;letter-spacing:2px;color:var(--muted);overflow:hidden;white-space:nowrap}.ticker b{color:var(--purple)}.section{padding:100px 0}.section-title h2,h2{font-size:clamp(32px,4vw,48px);line-height:1.16;letter-spacing:-1.9px;margin-bottom:23px}.section-title>p:last-child,.journey p{color:var(--muted);max-width:440px;font-size:15px}.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:38px;margin-top:56px}.steps article{border-top:1px solid var(--line);padding-top:18px}.step{color:var(--muted);font-size:10px;letter-spacing:2px}.steps h3,.particles h3{font-size:19px;letter-spacing:-.5px;margin-bottom:12px}.steps p,.particles p{color:var(--muted);font-size:13px;max-width:280px}.diagram{height:110px;position:relative;display:flex;align-items:center;justify-content:center;margin:15px 0}.spark i,.chain i,.chain b,.chain em{display:block;border-radius:50%;width:15px;height:15px;background:var(--cyan);box-shadow:0 0 30px #65e9ed55;position:absolute}.spark b{width:76px;height:76px;border:1px solid #65e9ed80;border-radius:50%;box-shadow:0 0 0 18px #65e9ed0c}.chain i{left:30%}.chain b{left:49%;background:var(--purple);box-shadow:0 0 0 25px #b6a0fb14}.chain em{left:70%;width:10px;height:10px;background:#ffd477}.goal{font-size:75px;color:#c5edac}.particle-section{background:#101627;border-block:1px solid #1d293e}.particles{display:grid;grid-template-columns:repeat(3,1fr);gap:46px 60px;margin-top:52px}.particles img{width:85px;height:85px;margin:0 0 22px}.particles span{font-size:8px;letter-spacing:1.6px;color:var(--purple)}.science-note{font-size:11px;color:var(--muted);margin:50px 0 0;border-top:1px solid var(--line);padding-top:24px}.journey{display:grid;grid-template-columns:1fr 1fr;gap:80px;align-items:center}.tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:27px}.tags span{font-size:10px;color:var(--muted);border:1px solid var(--line);border-radius:30px;padding:6px 12px}.constellation svg{width:100%;filter:drop-shadow(0 0 10px #65e9ed60)}.constellation path{fill:none;stroke:#b6a0fb70;stroke-width:1;stroke-dasharray:5 6}.constellation circle{fill:var(--cyan);stroke:#080d1c;stroke-width:6}.constellation circle:nth-child(3n){fill:var(--purple)}.constellation span{display:block;text-align:center;font-size:8px;letter-spacing:2px;color:var(--muted)}.launch{text-align:center;border:1px solid var(--line);border-radius:24px;padding:70px 24px;background:radial-gradient(ellipse at 50% 0,#30324d66,transparent 75%);margin-bottom:85px}.launch .eyebrow{justify-content:center}.launch p{font-size:14px;color:var(--muted)}.launch h2{font-size:clamp(36px,5vw,60px)}.secondary{background:transparent;border:1px solid #526079;color:var(--ink);margin-top:12px}.secondary:hover{background:#1d2b40;color:var(--ink)}footer{display:flex;justify-content:space-between;align-items:start;padding-bottom:36px;gap:20px}footer .brand{font-size:13px}footer p{font-size:11px;color:var(--muted);margin:0}footer>div{display:flex;gap:20px;align-items:center;font-size:10px;color:var(--muted)}.legal{max-width:740px;padding:55px 0 90px}.legal h1{font-size:46px;letter-spacing:-2px}.legal h2{font-size:23px;letter-spacing:-.6px;margin-top:35px}.legal p,.legal li{font-size:15px;color:var(--muted)}.legal a{text-decoration:underline;color:var(--cyan)}@media(max-width:850px){.hero{min-height:0;gap:5px}h1{letter-spacing:-2.5px}.hero-art{height:390px}.hero-notes{gap:12px}.actions{gap:16px}.journey{gap:30px}footer{flex-wrap:wrap}.particles{gap:40px 25px}.ticker{justify-content:flex-start}}@media(max-width:720px){.wrap{width:calc(100% - 40px)}.nav{padding:22px 0}.brand{font-size:15px}.nav nav{gap:14px}.nav nav>a:not(.nav-cta){display:none}.hero{grid-template-columns:1fr;padding:42px 0 50px}.hero-copy{z-index:2}.hero h1{font-size:51px}.lead{font-size:16px}.hero-art{height:355px;width:88%;margin:35px auto 25px}.hero-art img{object-position:center 45%}.art-caption{bottom:-13px}.section{padding:65px 0}.steps{grid-template-columns:1fr;gap:26px;margin-top:35px}.steps article{display:grid;grid-template-columns:100px 1fr;gap:0 18px}.step{grid-column:1/-1}.diagram{grid-row:2/4;margin:0}.steps h3{margin-top:20px}.steps p{max-width:none}.particles{grid-template-columns:1fr 1fr;gap:38px 22px}.particles img{width:70px;height:70px}.particles h3{font-size:18px}.particles span{font-size:7px;letter-spacing:1px}.particles p{font-size:12px}.journey{grid-template-columns:1fr;gap:35px}.constellation{max-width:370px;margin:auto}.launch{padding:50px 20px;margin-bottom:50px}.ticker{gap:25px;font-size:8px}footer{display:block}footer p{margin:10px 0 20px}footer>div{flex-wrap:wrap;gap:16px}.legal h1{font-size:36px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

.button{white-space:nowrap}
/* Keep tester download actions centered and contained on narrow screens. */
.launch .actions{justify-content:center;flex-wrap:wrap;margin:24px 0}
.launch .actions .secondary{margin-top:0}
@media(max-width:720px){
 .launch .actions{flex-direction:column;align-items:stretch;gap:12px}
 .launch .actions .button{width:100%;min-width:0;white-space:normal;gap:12px;padding:15px 16px}
}

/* Current feature overview shares the particle-card rhythm. */
.feature-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:32px;margin-top:40px}.feature-grid article{border-top:1px solid var(--line);padding-top:24px}.feature-symbol{display:block;font-size:32px;color:var(--purple);margin-bottom:14px}.feature-grid h3{font-size:19px;line-height:1.3}.feature-grid p,.guide-note,.score-guide p{font-size:14px;color:var(--muted)}.difficulty-key{display:flex;flex-wrap:wrap;gap:12px;margin:28px 0 20px}.difficulty-key span{border:1px solid currentColor;border-radius:30px;padding:5px 14px;font-size:12px}.easy{color:#9de6a8}.medium{color:#7eb8ff}.hard{color:#ffdc78}.very-hard{color:#ff9295}.guide-note{max-width:720px;margin-top:32px}.score-guide{border-top:1px solid var(--line);padding-top:24px;margin-top:26px;max-width:720px}.score-guide h3{font-size:19px}.journey-details{grid-column:1/-1}.journey-details>p{max-width:none}
@media(max-width:720px){.feature-grid{grid-template-columns:1fr;gap:24px}.feature-symbol{float:left;width:48px;margin:0 12px 8px 0}.feature-grid h3{margin-top:3px}.feature-grid p{clear:both}.hero h1{font-size:clamp(39px,13vw,51px)}.button{max-width:100%}.nav .brand{font-size:14px}.nav nav{gap:8px}}

/* Decorative orbits never widen the mobile document. */
.hero-art{overflow:hidden}

/* The player contacts YouTube only after an explicit play action. */
.video-frame{aspect-ratio:16/9;background:#101627;border:1px solid var(--line);border-radius:16px;overflow:hidden;margin-top:36px}.video-frame iframe{display:block;width:100%;height:100%;border:0}.video-poster{display:block;position:relative;width:100%;height:100%;padding:0;border:0;background:#101627;color:var(--ink);cursor:pointer;font:inherit}.video-poster img{width:100%;height:100%;object-fit:cover}.video-play{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);display:grid;place-items:center;width:72px;height:72px;background:var(--cyan);color:#080d1c;border-radius:50%;font-size:28px;padding-left:4px;box-shadow:0 0 40px #080d1c}.video-label{position:absolute;bottom:0;left:0;right:0;padding:28px 12px 14px;background:linear-gradient(transparent,#080d1cf2);font-size:14px}.video-poster:focus-visible{outline:4px solid var(--cyan);outline-offset:-5px}.video-note{font-size:13px;color:var(--muted);margin:14px 0}.video-note a{text-decoration:underline;color:var(--cyan)}.particles p{max-width:none}.particles article{border-top:1px solid var(--line);padding-top:24px}.tools-guide{padding-top:0}.tools-guide>p:not(.eyebrow){color:var(--muted);max-width:760px}.launch p a{text-decoration:underline}
@media(max-width:480px){.particles{grid-template-columns:1fr;gap:24px}.particles article{display:grid;grid-template-columns:64px minmax(0,1fr);column-gap:18px}.particles img{width:64px;height:64px;grid-row:1/3;margin:0}.particles h3{margin:0 0 8px}.particles p{font-size:13px;margin-bottom:0}.video-play{width:48px;height:48px;font-size:20px}.video-label{font-size:11px;padding-bottom:8px}.video-frame{border-radius:10px}}

@media(max-width:480px){.hero .actions{align-items:flex-start;flex-direction:column;gap:14px}.platforms br{display:none}.platforms strong{display:block}}

/* Searchable guides share the existing visual language. */
.guide-page{max-width:1000px}.guide-page h1{font-size:clamp(32px,6vw,56px);line-height:1.15;max-width:900px;overflow-wrap:anywhere}.guide-page h2{font-size:28px;margin-top:42px}.guide-page>p{max-width:760px;color:var(--muted);line-height:1.8}.guide-page a:not(.button),.guide-links a{text-decoration:underline;text-underline-offset:4px}.guide-download{margin-top:56px;padding:28px 0;border-top:1px solid var(--line)}.guide-nav{display:flex;gap:20px;flex-wrap:wrap;margin-top:40px}.guide-page .particles{margin-top:40px}.guide-page .particles p{line-height:1.7}.guide-page .video-frame{margin-top:32px}@media(max-width:480px){.guide-page h2{font-size:24px}.guide-page .button{white-space:normal;max-width:100%}.guide-nav{gap:14px}.guide-page .particles article{display:block}.guide-page .particles img{float:left;margin:0 16px 12px 0}.guide-page .particles p{clear:both}}

/* Sourced physics stories: long-form reading without changing gameplay cards. */
.science-page{max-width:880px}.breadcrumbs{font-size:13px;margin-bottom:32px;display:flex;flex-wrap:wrap;gap:8px;color:var(--muted)}.science-hero img{display:block;margin-bottom:24px}.science-page article p{font-size:17px;line-height:1.9;color:var(--muted);max-width:74ch}.science-page article h2{line-height:1.3}.science-boundary{border-left:3px solid var(--purple);padding:4px 0 4px 24px;margin-top:36px}.science-boundary h2{margin-top:18px}.science-sources{border-top:1px solid var(--line);margin-top:40px}.science-sources li{margin:16px 0;line-height:1.7}.science-sources p,.science-status{font-size:13px!important;color:var(--muted)}.science-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:32px;margin-top:44px}.science-grid article{border-top:1px solid var(--line);padding-top:24px}.science-grid img{margin-bottom:12px}.science-grid h2{font-size:23px;margin:0 0 10px}.science-grid p{color:var(--muted);line-height:1.7}.source-link{font-size:.85em}.particle-story-link{font-weight:600;margin-top:14px!important}.science-page .actions{flex-wrap:wrap}.science-page .secondary{margin-top:0}.science-page a{overflow-wrap:anywhere}@media(max-width:720px){.science-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:480px){.science-grid{grid-template-columns:1fr}.science-page article p{font-size:16px}.science-boundary{padding-left:16px}.science-page .actions{flex-direction:column;align-items:stretch}.science-page .actions .button{white-space:normal}.particles .particle-story-link{grid-column:2}.science-hero img{width:88px;height:88px}}