:root{--bg:#10141a;--panel:#171d25;--panel2:#1c2430;--text:#eef2f7;--muted:#9da8b7;--accent:#72c9f4;--purple:#a743a7;--line:#303b49;--max:1180px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font:16px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--bg);color:var(--text)}a{color:var(--accent);text-decoration:none}a:hover{color:#b7e7ff}.topbar{height:92px;position:sticky;top:0;z-index:20;background:#0e1319;border-bottom:1px solid var(--line);display:flex;align-items:center;padding:8px 28px;gap:30px}.logo-link{width:205px;flex:0 0 205px;display:flex;align-items:center}.logo-link img{display:block;width:100%;height:70px;object-fit:contain}.topnav{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.topnav a{color:#dbe2eb;padding:8px 11px;border-radius:7px;font-size:14px;font-weight:600}.topnav a:hover,.topnav a.active{background:#202a35;color:#fff;text-decoration:none}.layout{display:grid;grid-template-columns:296px minmax(0,1fr);min-height:calc(100vh - 92px)}.side{position:sticky;top:92px;height:calc(100vh - 92px);overflow:auto;background:var(--panel);border-right:1px solid var(--line);padding:18px 15px}.side-title{font-weight:800;font-size:15px;margin:0 5px 12px;color:#fff}.search{width:100%;padding:10px 11px;border-radius:8px;border:1px solid var(--line);background:#10151b;color:white;margin-bottom:14px}.nav-section{margin:10px 0}.nav-title{font-size:13px;color:#f0f3f7;font-weight:800;margin:8px 7px 4px}.nav a{display:block;padding:4px 8px;border-radius:6px;color:#aeb9c7;font-size:13px}.nav a.active{background:var(--panel2);color:#fff;font-weight:700}.content{padding:34px 50px 80px}.article{max-width:var(--max);margin:0 auto}.article h1{font-size:38px;line-height:1.15;margin:0 0 18px}.article h2{font-size:24px;margin-top:38px;border-bottom:1px solid var(--line);padding-bottom:7px}.article h3{font-size:19px;margin-top:28px}.article p,.article li{color:#d8dee7}.article strong{color:#fff}.article code{background:#242d38;border:1px solid #364352;padding:.12em .35em;border-radius:4px}.article pre{background:#0b0f14;border:1px solid var(--line);padding:16px;border-radius:9px;overflow:auto}.article pre code{border:0;background:none;padding:0}.article blockquote{margin:20px 0;padding:10px 18px;border-left:4px solid var(--purple);background:#181e27}.article table{border-collapse:collapse;width:100%;margin:20px 0}.article th,.article td{border:1px solid var(--line);padding:8px 10px;text-align:left}.article img{max-width:100%}.crumb{color:#8995a4;font-size:13px;margin-bottom:13px}.footer{margin-top:60px;padding-top:20px;border-top:1px solid var(--line);color:#747f8d;font-size:13px}.results{display:none;margin:-8px 0 12px;background:#10151b;border:1px solid var(--line);border-radius:8px;max-height:280px;overflow:auto}.results a{display:block;padding:7px 10px;font-size:13px}.results a:hover{background:#222b36;text-decoration:none}.hero{padding:8px 0 10px}.hero-kicker{color:var(--accent);font-weight:800;letter-spacing:.08em;text-transform:uppercase;font-size:13px}.hero h1{font-size:44px;margin:7px 0 12px}.hero p{font-size:18px;max-width:850px;color:#b9c3d0}.tiles{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:28px 0 38px}.tile{display:block;background:var(--panel);border:1px solid var(--line);border-radius:11px;padding:18px 18px 20px;min-height:142px;transition:.15s transform,.15s border-color,.15s background}.tile:hover{transform:translateY(-2px);border-color:#526477;background:#1b232d;text-decoration:none}.tile h3{margin:0 0 7px;font-size:18px;color:var(--accent)}.tile p{margin:0;color:#aeb8c5;font-size:14px;line-height:1.5}.home-intro{border-top:1px solid var(--line);padding-top:8px}@media(max-width:1050px){.tiles{grid-template-columns:repeat(2,1fr)}.topbar{height:auto;position:relative;align-items:flex-start}.layout{min-height:0}.side{top:0;height:auto;position:relative}.topnav{padding-top:8px}}@media(max-width:820px){.layout{display:block}.side{border-right:0;border-bottom:1px solid var(--line)}.content{padding:28px 22px}.nav{columns:2}.topbar{display:block}.logo-link{width:180px}.tiles{grid-template-columns:1fr}.hero h1{font-size:35px}}@media(max-width:520px){.nav{columns:1}.topnav{display:block}.topnav a{display:inline-block}.content{padding:24px 16px}}

.home-showcase{margin:22px 0 30px}.home-showcase img{display:block;width:100%;height:auto;border:1px solid var(--line);border-radius:12px;box-shadow:0 14px 36px rgba(0,0,0,.28)}
.module-figure{margin:22px 0 30px;padding:16px;background:#131920;border:1px solid var(--line);border-radius:12px}.module-figure img{display:block;width:auto;max-width:100%;max-height:760px;margin:0 auto;border-radius:8px}.module-figure figcaption{margin-top:10px;text-align:center;color:var(--muted);font-size:13px;font-style:italic}

/* Module browser */
.module-browser-intro{max-width:900px;margin-bottom:10px}.module-categories{display:flex;gap:5px;flex-wrap:wrap;margin:12px 0 5px;padding-bottom:6px;border-bottom:1px solid var(--line)}.module-category,.module-pick{appearance:none;border:1px solid #3b4857;background:#171e27;color:#dce4ed;border-radius:6px;font:inherit;font-weight:700;cursor:pointer;transition:.12s;line-height:1}.module-category{padding:6px 14px;font-size:13px;min-height:27px}.module-category:hover,.module-category.active{background:#273443;border-color:#60768c;color:#fff}.module-button-area{margin-bottom:8px}.module-buttons{display:none;grid-template-columns:repeat(10,minmax(58px,1fr));gap:4px;margin:0 0 8px}.module-buttons.active{display:grid}.module-pick{padding:5px 5px;font-size:11px;min-height:25px;white-space:nowrap}.module-pick:hover,.module-pick.active{background:#2b3542;border-color:var(--accent);color:#fff}.module-detail{display:none;border-top:1px solid var(--line);padding-top:12px}.module-detail.active{display:grid;grid-template-columns:minmax(0,1fr) minmax(240px,38%);grid-template-areas:"head figure" "copy figure";column-gap:28px;align-items:start}.module-detail-head{grid-area:head;display:flex;align-items:flex-end;justify-content:space-between;padding-top:3px}.module-detail h2{border:0;margin:0 0 7px;padding:0;font-size:28px}.module-group-label{text-transform:uppercase;letter-spacing:.1em;color:var(--accent);font-size:10px;font-weight:800}.module-detail .module-figure{grid-area:figure;margin:0;justify-self:end;width:80%;max-width:430px}.module-detail .module-figure img{width:100%;height:auto;max-height:520px;object-fit:contain}.module-detail .module-figure figcaption{font-size:11px;margin-top:5px}.module-copy{grid-area:copy}.module-copy p:first-child{margin-top:4px}.module-copy h2{font-size:21px;margin-top:24px;border-bottom:1px solid var(--line);padding-bottom:5px}@media(max-width:1250px){.module-buttons{grid-template-columns:repeat(8,minmax(58px,1fr))}.module-detail.active{grid-template-columns:minmax(0,1fr) minmax(220px,36%);column-gap:22px}.module-detail .module-figure{width:80%}}@media(max-width:900px){.module-buttons{grid-template-columns:repeat(5,minmax(58px,1fr))}.module-detail.active{display:block}.module-detail .module-figure{width:80%;max-width:420px;margin:8px auto 14px}.module-detail{padding-top:10px}}@media(max-width:520px){.module-buttons{grid-template-columns:repeat(3,minmax(58px,1fr))}.module-category{padding:5px 9px;font-size:12px}.module-detail .module-figure{width:90%}}

/* Collapsible left navigation */
.nav-title.collapsible-title{cursor:pointer;display:flex;align-items:center;gap:6px;user-select:none}
.nav-title.collapsible-title::before{content:'▾';display:inline-block;width:10px;color:#8e9aa8;font-size:10px;transition:transform .12s ease}
.nav-section.collapsed .nav-title.collapsible-title::before{transform:rotate(-90deg)}
.nav-links{display:block}
.nav-section.collapsed .nav-links{display:none}
.nav-title.collapsible-title:hover{color:#fff}

/* Engine browser */
.engine-categories{display:flex;gap:5px;flex-wrap:wrap;margin:12px 0 5px;padding-bottom:6px;border-bottom:1px solid var(--line)}.engine-category,.engine-pick{appearance:none;border:1px solid #3b4857;background:#171e27;color:#dce4ed;border-radius:6px;font:inherit;font-weight:700;cursor:pointer;transition:.12s;line-height:1}.engine-category{padding:6px 14px;font-size:13px;min-height:27px}.engine-category:hover,.engine-category.active{background:#273443;border-color:#60768c;color:#fff}.engine-button-area{margin-bottom:8px}.engine-buttons{display:none;grid-template-columns:repeat(10,minmax(58px,1fr));gap:4px;margin:0 0 8px}.engine-buttons.active{display:grid}.engine-pick{padding:5px;font-size:11px;min-height:25px;white-space:nowrap}.engine-pick:hover,.engine-pick.active{background:#2b3542;border-color:var(--accent);color:#fff}.engine-detail{display:none;border-top:1px solid var(--line);padding-top:14px}.engine-detail.active{display:block}.engine-detail h2{margin:2px 0 8px;border:0;padding:0}.engine-detail h3{margin-top:22px}@media(max-width:1250px){.engine-buttons{grid-template-columns:repeat(8,minmax(58px,1fr))}}@media(max-width:900px){.engine-buttons{grid-template-columns:repeat(5,minmax(58px,1fr))}}@media(max-width:520px){.engine-buttons{grid-template-columns:repeat(3,minmax(58px,1fr))}.engine-category{padding:5px 9px;font-size:12px}}

.engine-intro{max-width:980px;margin-bottom:18px}.engine-intro h2{margin-bottom:8px}.engine-intro p{margin:8px 0}.engine-example{margin:12px 0;padding:10px 14px;border:1px solid rgba(168,85,247,.35);border-radius:8px;background:rgba(168,85,247,.06);line-height:1.8}.engine-example code{white-space:nowrap}

/* Day / Night module fronts: identical boxes, opacity-only crossfade. */
.module-visual-stack{position:relative;width:100%;line-height:0}.module-visual-stack img{display:block;width:100%;height:auto}.module-visual-stack .module-night{position:absolute;inset:0;opacity:0;animation:rfmNightFade 10s ease-in-out infinite}.module-visual-stack:hover .module-night{animation-play-state:paused}@keyframes rfmNightFade{0%,20%{opacity:0}40%,60%{opacity:1}80%,100%{opacity:0}}@media(prefers-reduced-motion:reduce){.module-visual-stack .module-night{animation:none;opacity:0}}

.home-app-fade{position:relative;overflow:hidden;background:#000}.home-app-fade img{display:block;width:100%;height:auto;border:0;border-radius:0;box-shadow:none}.home-app-fade .home-app-night{position:absolute;inset:0;width:100%;height:100%;object-fit:fill;opacity:0;animation:homeNightFade 10s ease-in-out infinite}.home-app-fade:hover .home-app-night{animation-play-state:paused}@keyframes homeNightFade{0%,20%{opacity:0}40%,60%{opacity:1}80%,100%{opacity:0}}@media (prefers-reduced-motion:reduce){.home-app-fade .home-app-night{animation:none;opacity:0}}

/* Getting Started illustrations */
.getting-started-figure img{max-height:720px;width:auto;max-width:100%;object-fit:contain}.getting-started-wide img{width:100%;max-width:1100px;height:auto;object-fit:contain}.signal-path{font-size:1.12rem;letter-spacing:.02em}.article ol{line-height:1.75;padding-left:1.5rem}

/* Concept illustrations and global breadcrumbs */
.concept-figure{margin:1.7rem 0 2rem}.concept-figure img{display:block;max-width:100%;max-height:720px;width:auto;height:auto;border-radius:8px}.concept-wide img{width:100%;max-height:none}.concept-figure figcaption{margin-top:.65rem;color:var(--muted,#91a0af);font-size:.92rem;line-height:1.45}.crumb a{color:inherit;text-decoration:none}.crumb a:hover{color:#6ed7ff}.crumb-sep{opacity:.45;margin:0 .35rem}.crumb span:last-child{opacity:.75}.concept-links{line-height:1.8}

/* Guide/topic pages */
.section-lead{max-width:980px;font-size:17px}.topic-filter{display:flex;flex-wrap:wrap;gap:6px;margin:18px 0 20px;padding-bottom:10px;border-bottom:1px solid var(--line)}.topic-filter button{appearance:none;border:1px solid #3b4857;background:#171e27;color:#dce4ed;border-radius:6px;padding:7px 12px;font:inherit;font-size:12px;font-weight:800;cursor:pointer}.topic-filter button:hover,.topic-filter button.active{background:#273443;border-color:#60768c;color:#fff}.guide-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin:0 0 34px}.guide-card{display:block;background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:15px 16px;min-height:145px}.guide-card:hover{background:#1b232d;border-color:#526477;text-decoration:none}.guide-card>span{font-size:10px;letter-spacing:.09em;font-weight:800;color:var(--muted)}.guide-card h3{margin:4px 0 7px;font-size:17px;color:var(--accent)}.guide-card p{margin:0;font-size:13px;line-height:1.5;color:#aeb8c5}.patch-placeholder{margin:22px 0;padding:24px;border:1px dashed #526477;border-radius:10px;background:#131920;text-align:center;color:#dbe5ef}.patch-placeholder strong{display:block;font-size:16px}.patch-placeholder span{display:block;margin-top:4px;color:var(--muted);font-size:13px}.callout{margin:18px 0;padding:13px 16px;border-left:4px solid var(--accent);background:#151d26;color:#cbd5df}@media(max-width:1000px){.guide-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:600px){.guide-grid{grid-template-columns:1fr}}