

:root{--background:#111318;--foreground:#f2efe7;--panel:#191c22;--line:#2e3138;--muted:#9dA2ac;--accent:#ed785f;--gold:var(--accent);color-scheme:dark}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:28px}body{margin:0;color:var(--foreground);background:var(--background);font:15px/1.65 "Segoe UI","Microsoft YaHei",system-ui,sans-serif;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button,a,summary{-webkit-tap-highlight-color:transparent}button,input,textarea,select{font:inherit}button{cursor:pointer}a:focus-visible,button:focus-visible,summary:focus-visible{outline:2px solid var(--accent);outline-offset:5px}::selection{background:var(--accent);color:var(--background)}.wrap{max-width:1440px;padding:0 48px;margin:auto}.skip-link{position:absolute;left:24px;top:-60px;background:var(--foreground);color:var(--background);padding:8px 16px;z-index:10}.skip-link:focus{top:10px}header{height:72px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid 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var(--line)}summary{cursor:pointer;list-style:none;display:flex;align-items:center;gap:16px}summary::-webkit-details-marker{display:none}summary::after{content:'＋';color:var(--accent);font-weight:400;margin-left:auto;font-size:17px}details[open]>summary::after{content:'−'}.verification-note>summary{color:var(--muted);font-size:12px}.archive{margin-top:23px;background:#191c2280;border:1px solid var(--line);padding:0 20px}.archive>summary{font-size:13px;font-weight:600;padding:16px 0}.archive-count{font:11px ui-monospace,monospace;color:var(--muted);margin-left:9px}.archive-hint{margin-left:auto;color:var(--muted);font-size:11px;font-weight:400}.archive>summary::after{margin-left:0}.retention-note{font-size:11px;color:var(--muted);padding-bottom:15px;margin:0}.history>details{border-top:1px solid var(--line);padding:15px 0}.history summary{font-size:13px}.historic-version{color:var(--accent);font:12px ui-monospace,monospace;min-width:42px}.historic-title{flex:1;min-width:0}.historic-published{display:block;margin-top:4px;color:#7f8793;font-size:10px;font-weight:400;line-height:1.6}.history-body{padding:14px 0 4px 58px}.history-body .summary{margin:0}.history-body .gallery{margin-top:20px}.history-body .release-videos{max-width:640px;margin-top:20px}.gallery{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.gallery figure{margin:0;min-width:0}.gallery img{width:100%;aspect-ratio:1.6;object-fit:cover;display:block;transition:transform .35s}.gallery a:hover img{transform:scale(1.025)}.gallery figcaption{display:flex;align-items:baseline;gap:10px;margin-top:10px;color:var(--muted);font-size:11px;line-height:1.7}.photo-number{font:10px ui-monospace,monospace;color:var(--accent);flex:none}.gallery .image-expand{width:26px;height:26px;right:8px;top:8px;font-size:15px}.getting-started{display:grid;grid-template-columns:1.4fr 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svg{width:17px;height:17px}footer{padding:23px 0 29px;display:flex;justify-content:space-between;border-top:1px solid var(--line);color:#7f8793;font-size:10px;gap:20px;align-items:center}.footer-brand{font-size:22px;letter-spacing:-.06em;font-weight:800;color:#d5d2ca}.footer-brand span{font-weight:400;color:var(--accent);margin-left:10px}footer>span{text-align:right;line-height:1.8}.release-videos{margin:0}.release-videos h4{font-size:10px;color:var(--muted);font-weight:500;margin:0 0 10px;letter-spacing:.1em}.video-grid{display:grid;gap:18px}.video-card{margin:0;background:#171a20}.video-card video{display:block;width:100%;height:auto;aspect-ratio:1.6;background:#090c11}.video-card figcaption{padding:13px 15px}.video-heading{display:flex;gap:14px;align-items:baseline;justify-content:space-between}.video-heading strong{font-size:12px;font-weight:600}.video-heading span{color:var(--accent);font:10px ui-monospace,monospace;white-space:nowrap}.video-card 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var(--accent);outline-offset:1px}.feedback-input::placeholder{color:#6e7786}.feedback-textarea{min-height:118px;resize:vertical}.public-notice{font-size:10px;line-height:1.8;color:var(--muted);margin-bottom:12px}.submit-row{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:12px}.feedback-submit{background:var(--foreground);color:#16181e;border-radius:0;font-size:12px;font-weight:650;min-height:40px;padding:9px 17px;transition:background .18s}.feedback-submit:hover{background:var(--accent)}.feedback-submit:disabled{opacity:.5}.feedback-refresh{color:var(--muted);border-radius:0;font-size:11px;min-height:32px}.feedback-refresh:hover{color:var(--accent);background:transparent}.rate-note{font-size:10px;color:#707b8c;margin-top:10px;margin-bottom:0}.feedback-trap{position:absolute;left:-10000px;width:1px;height:1px;overflow:hidden}.feed-heading{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);padding-bottom:8px;margin-bottom:0}.feed-heading h3{font-size:14px;margin:0}.empty-feedback{min-height:170px;display:grid;align-content:center;justify-items:center;text-align:center;color:var(--muted);font-size:12px;border-bottom:1px solid var(--line);padding:20px}.empty-symbol{font-size:28px;line-height:1.3;color:var(--accent);margin-bottom:12px}.comment-list{list-style:none;margin:0;padding:0;max-height:367px;overflow:auto;scrollbar-width:thin;scrollbar-color:#444b58 transparent}.comment{margin:0;padding:15px 0;border-bottom:1px solid var(--line)}.comment::before{display:none}.comment-meta{display:flex;justify-content:space-between;gap:14px;align-items:baseline}.comment-meta strong{font-size:12px;font-weight:600;overflow-wrap:anywhere}.comment-meta span{font-size:10px;color:var(--accent);flex:none}.comment-body{white-space:pre-wrap;overflow-wrap:anywhere;color:#bcc3ce;font-size:12px;margin:7px 0;line-height:1.8}.comment time{font-size:10px;color:#707b8c}.feedback-more{margin-top:15px;border:1px solid var(--line);border-radius:0;color:var(--muted);background:transparent;font-size:12px}.feedback-error{font-size:12px;color:#ff9b83;margin-top:12px}.feedback-success{font-size:12px;color:#b0cba9;margin-top:12px}.feedback-options{display:flex;align-items:center;justify-content:space-between;gap:20px;margin:15px 0}.feedback-options label{font-size:12px;margin-bottom:8px}.feedback-version{min-width:150px;min-height:36px;border:1px solid var(--line);border-radius:0;color:var(--foreground);font-size:12px;background:#181b21}.feedback-version-menu{background:#1b1f27;color:var(--foreground);border:1px solid #444b57;border-radius:0}.feedback-version-menu [role=option]:focus{background:#333944}.anonymous-control{display:flex;align-items:center;gap:9px;margin-top:20px}.anonymous-control label{margin:0}.anonymous-switch{width:34px!important;height:20px!important;background:#454c58;border:0}.anonymous-switch[data-state=checked]{background:var(--accent)}.anonymous-switch [data-slot=switch-thumb]{background:#111318;width:16px;height:16px}.anonymous-switch[data-state=checked] [data-slot=switch-thumb]{transform:translateX(16px)}
@media(min-width:1500px){.intro{gap:55px}}
@media(max-width:1050px){.wrap{padding:0 30px}.intro{grid-template-columns:300px minmax(0,1fr);gap:26px}h1{font-size:49px}.shot-label{display:block}.shot-label>span:last-child{display:block;margin-top:5px;text-align:left}.release-published br{display:block}.release-published time{margin-left:0}.updates{gap:26px}.guestbook-layout{gap:30px}.gallery{gap:14px}.getting-started{grid-template-columns:1.2fr 1fr;gap:25px}}
@media(max-width:760px){.wrap{padding:0 20px}header{height:auto;min-height:65px;gap:13px;flex-wrap:wrap;padding:16px 0 11px}.logo{font-size:16px}.mark{height:17px;width:17px}.logo-edition{font-size:9px}nav{gap:19px;font-size:12px;width:100%;justify-content:space-between}nav a{padding:3px 0}.intro{grid-template-columns:1fr;gap:23px;padding:26px 0}.intro-copy{display:grid;grid-template-columns:1fr 1.05fr;column-gap:22px;align-items:start}.eyebrow{grid-column:1/-1;font-size:10px;margin-bottom:15px}h1{font-size:45px;margin:0 0 10px}.subhead{font-size:17px;grid-column:1}.releasebox{grid-column:2;grid-row:2/5;margin:0;padding:0;border:0}.version{font-size:14px}.badge{font-size:10px}.download{min-height:45px;padding:9px 10px;margin:9px 0}.download>span{font-size:11px;gap:5px}.download>span svg{width:14px}.download>svg{width:16px}.download-note,.fallback-download{font-size:10px}.release-published{font-size:9px;margin-top:8px}.hero-shot img{aspect-ratio:1.6}.shot-label{display:flex;font-size:9px;gap:12px}.shot-label>span:last-child{text-align:right;margin:0}.section{padding:25px 0}.section-head{margin-bottom:18px;gap:10px}.section-title{gap:12px}h2{font-size:20px}.section-index{font-size:10px}.section-count{font-size:9px}.updates{grid-template-columns:1fr;gap:20px}.latest-media{max-width:none}.latest-media .release-videos h4{display:none}.gallery{grid-template-columns:repeat(2,minmax(0,1fr));gap:17px 12px}.gallery figure:first-child:last-child{grid-column:1/-1}.gallery figcaption{font-size:10px;gap:7px;margin-top:8px}.guestbook-layout{grid-template-columns:1fr;gap:26px}.getting-started{grid-template-columns:1fr;gap:20px}.checksum{display:block;margin-top:17px}.checksum code{display:block;margin-top:4px;font-size:9px}.notice{padding:13px 15px}.comment-list{max-height:340px}.history-body{padding-left:0}.archive{padding:0 14px}.archive>summary{padding:13px 0}.history summary{gap:12px}.history>details{padding:12px 0}.video-card figcaption{padding:12px}.footer-brand{font-size:19px}footer{padding:20px 0 24px;align-items:flex-start}footer>span{font-size:9px}.section-link{font-size:10px;gap:7px}}
@media(max-width:470px){.wrap{padding:0 18px}.intro-copy{display:block}.eyebrow{margin-bottom:14px}h1{font-size:60px;margin:0 0 11px}.subhead{font-size:17px}.subhead br{display:none}.releasebox{margin-top:20px;padding-top:13px;border-top:1px solid var(--line)}.release-top{gap:10px}.version{font-size:16px}.badge{font-size:10px}.download{min-height:46px;margin:10px 0 8px;padding:10px 14px}.download>span{font-size:13px;gap:8px}.download>span svg{width:17px}.download>svg{width:21px}.download-note{font-size:11px}.fallback-download{font-size:10px;margin-top:8px}.release-published{font-size:9px;margin-top:9px}.release-published br{display:none}.release-published time{margin-left:6px}.intro{padding:23px 0;gap:19px}.shot-label{display:block}.shot-label>span:last-child{text-align:left;margin-top:4px}.gallery{grid-template-columns:1fr;gap:20px}.gallery figcaption{font-size:11px}.gallery .image-expand{width:28px;height:28px}.section-count{font-size:8px}.section-title{gap:9px}h2{font-size:19px}.section-index{font-size:9px}.update-heading{gap:10px}h3{font-size:18px}.summary,li{font-size:12px}.steps{gap:12px}.step p{font-size:11px}.step h3{font-size:13px}.archive-hint{font-size:10px}.feedback-input{font-size:16px!important}.feedback-options{gap:10px}.video-heading strong{font-size:11px}}
@media(prefers-reduced-motion:no-preference){.intro-copy{animation:arrive .55s both}.hero-shot{animation:arrive .65s .08s both}@keyframes arrive{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation:none!important;transition:none!important}}
.arrow-up{display:inline-flex;vertical-align:middle}.arrow-up svg{width:13px;height:13px;transform:rotate(-45deg)}.image-expand svg{width:17px;height:17px;transform:rotate(-45deg)}.video-card a{display:inline-flex;align-items:center;gap:5px}.video-card a svg{width:11px;height:11px}.anonymous-switch [data-slot=switch-thumb]{translate:0!important;transform:translateX(2px);background:#111318!important}.anonymous-switch[data-state=checked] [data-slot=switch-thumb]{transform:translateX(16px)}
@media(max-width:470px){h1{font-size:clamp(46px,15vw,60px)}}
nav a{white-space:nowrap}@media(max-width:470px){nav{gap:clamp(8px,3vw,19px)}}

/* Keep the approved tall comparison intact inside the existing gallery frame. */
.gallery img[src$="REBOUND_Ricochet_Comparison.png"]{object-fit:contain}

.feedback-input{display:block;width:100%}.anonymous-switch{padding:0;border-radius:999px;display:inline-flex;align-items:center}button{border:0}.feedback-version{padding:6px}
