/* v4 materials: clear floating controls, quiet content, bounded optical effects. */
:root{--ink:#202735;--glass-tint:rgba(249,252,255,.48);--glass-edge:rgba(255,255,255,.92);--glass-shadow:0 12px 36px #26365314,0 2px 6px #29374c0a;--surface:rgba(255,255,255,.64);--glass-blue:#205bd6;color-scheme:light}
body{color:var(--ink);background-color:#eef1f6;background-image:radial-gradient(ellipse at 90% 28%,#bad0fb70 0,transparent 55%),radial-gradient(ellipse at 8% 75%,#d4c5eb48 0,transparent 50%);background-attachment:fixed}
:where(.topbar,.category-nav,.demo-dock,.toolbar){isolation:isolate;border:1px solid var(--glass-edge);background:linear-gradient(128deg,#ffffffa3,#f6faff52 52%,#e9f0ff6e);-webkit-backdrop-filter:blur(22px) saturate(1.65);backdrop-filter:blur(22px) saturate(1.65);box-shadow:var(--glass-shadow),inset 0 1px 1px #fff,inset 0 -1px 2px #ffffffa8;border-radius:30px}
:where(.topbar,.category-nav,.demo-dock,.toolbar)::before{content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;z-index:-1;background:radial-gradient(ellipse at var(--glass-x,25%) 0%,#ffffffbd 0%,#ffffff12 48%,transparent 74%),linear-gradient(160deg,#fff8,transparent 25%,transparent 74%,#d5e1f54d);box-shadow:inset 1px 1px 1px #fff,inset -1px -1px 1px #fff8}
/* Refraction belongs to the rim, never glyphs or file contents. Chromium can
   refract the real backdrop; other engines retain the same clear material. */
html.glass-optics :where(.topbar,.demo-dock)::after{content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;z-index:-2;backdrop-filter:url(#glass481-rim);mask-image:linear-gradient(#000,transparent 8px,transparent calc(100% - 8px),#000);opacity:.5}
.topbar{position:relative}.topbar .brand{white-space:nowrap}.master-tabs{gap:3px;padding:5px;background:#e5ebf333;border:1px solid #fff8;border-radius:28px;box-shadow:inset 0 1px 3px #2636530a;min-width:0}
.master-tabs button{font-size:13px;line-height:1.25;white-space:normal;padding:12px 16px;min-height:42px;border:1px solid transparent;border-radius:23px;color:#394456;background:transparent;box-shadow:none;transition:background .18s,box-shadow .18s,transform .18s}
.master-tabs button[aria-selected=true],.category-nav button.active{background:linear-gradient(155deg,#ffffffed,#f5f8ff9c);color:#192536;border-color:#ffffffd9;box-shadow:0 3px 10px #243d6424,inset 0 1px 1px #fff,inset 0 -1px 1px #b5c4d142}
.master-tabs button:hover,.category-nav button:hover{background-color:#ffffff6e}
:where(button,a,input,select,summary):focus-visible{outline:3px solid #2563eb;outline-offset:3px}
:where(button,.primary){transition:background-color .16s,box-shadow .16s,transform .16s}button:active:not(:disabled){transform:scale(.98)}
:where(button.primary,#connect,#next){background:linear-gradient(160deg,#3478ee,#205bd6);color:white;box-shadow:0 4px 12px #1c5bdc26,inset 0 1px 1px #a9cdff99;border:1px solid #2360d540}
:where(.topbar select,.topbar button,.live-connection select){border-radius:24px}
.live-connection{display:flex;align-items:center;gap:12px;margin:0 0 20px;color:#58667b;font-size:13px}.live-connection select{font:inherit;padding:10px 35px 10px 15px;background-color:#ffffffa8;border:1px solid white;color:#202735;box-shadow:0 2px 8px #2636530c;min-height:40px}
:where(.tile,.orientation,.starting-path,.card,section.card,.mix-panel){background:var(--surface);border:1px solid #ffffffbc;box-shadow:0 3px 20px #23365305;border-radius:24px}
.category-nav{position:sticky}.category-nav button{border-radius:24px;border:1px solid transparent;color:#455166;transition:background .18s,box-shadow .18s}
.tile{position:relative}.new-badge{display:inline-block;margin:0 0 12px;color:#2756ac;font-size:10px;font-weight:750;letter-spacing:.11em}.new-lessons{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:30px 0 20px}.new-lesson{display:flex;align-items:center;text-align:left;gap:18px;padding:22px;border-radius:22px;border:1px solid #fff;background:linear-gradient(135deg,#ffffffbd,#f9fbff70);color:var(--ink);box-shadow:0 3px 18px #26365308;min-height:112px}.new-lesson strong{display:block;font-size:17px;letter-spacing:-.025em}.new-lesson small{display:block;font-size:13px;line-height:1.5;color:#53617a;margin-top:8px}.new-play{margin-left:auto;flex:0 0 28px;width:28px;height:28px;border-radius:50%;padding:7px;background:#2563eb0e;color:#205bd6}.new-play svg{width:100%;height:100%;fill:currentColor}.new-note{font-size:13px;color:#5b687b;line-height:1.6}.release-details{padding:18px 0;border-top:1px solid #dce3ed}.release-details summary{font-size:14px;font-weight:650;cursor:pointer}.release-details ul{padding-left:22px;color:#53617a;font-size:14px;line-height:1.65}.release-details li+li{margin-top:8px}.whats-new{scroll-margin-top:105px}.whats-new h1{margin-top:8px}
.finder{background:#f8faff8c;border:1px solid #fff;box-shadow:0 14px 60px #25395b12;border-radius:24px;overflow:hidden}.finder>aside{background:linear-gradient(165deg,#f7faffb8,#e5ecf799);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);border-right:1px solid #ffffffd9}.finder .toolbar{border-radius:0;border-left:0;border-right:0;position:relative;box-shadow:inset 0 1px #fff,0 1px 8px #26365306}.finder .browser{background:#ffffff75}.finder .side.selected{background:#d2e1f6b0;color:#234971;box-shadow:inset 0 1px #ffffffa6}.finder .side-bottom #setup{font-size:11px;white-space:normal;text-align:left;line-height:1.5}.finder table tbody tr:hover{background:#e6eefc7a}dialog{border:1px solid #fff!important;border-radius:26px!important;background:#f8fafff5!important;box-shadow:0 25px 100px #192c4f38!important}dialog::backdrop{background:#1d2a412b;backdrop-filter:blur(5px)}
/* Wizard headings/progress remain opaque enough to scan at any phase. */
.card{background:linear-gradient(130deg,#ffffffdb,#f7faffb8)}.card h1{letter-spacing:-.045em}.status{background:#e6edf7a8}progress{accent-color:#235edc}
@supports not ((backdrop-filter:blur(1px)) or (-webkit-backdrop-filter:blur(1px))){:where(.topbar,.category-nav,.demo-dock,.toolbar,.finder>aside){background:#f4f7fc}}
@media(max-width:1100px){.topbar{gap:10px;padding:14px 18px}.master-tabs button{padding:10px 12px;font-size:12px}.topbar .brand span{display:none}}
@media(max-width:780px){.topbar{border-radius:25px;flex-wrap:wrap}.master-tabs{order:3;width:100%;overflow:visible;display:grid;grid-template-columns:repeat(4,minmax(0,1fr))}.master-tabs button{font-size:11px;padding:9px 5px}.new-lessons{grid-template-columns:1fr}.new-lesson{min-height:98px;padding:18px}.category-nav{border-radius:24px;overflow:auto}.finder .toolbar{border-radius:0}.live-connection{justify-content:flex-start}.new-lesson strong{font-size:16px}}
@media(prefers-reduced-motion:reduce){:where(button,.primary,.category-nav button){transition:none!important}button:active{transform:none!important}}
@media(prefers-reduced-transparency:reduce),(prefers-contrast:more){:where(.topbar,.category-nav,.demo-dock,.toolbar,.finder>aside,.card,.tile,.orientation,.starting-path,.mix-panel){background:#f8faff!important;backdrop-filter:none!important;-webkit-backdrop-filter:none!important;border-color:#b5c0d0!important}html.glass-optics :where(.topbar,.demo-dock)::after{display:none}.new-lesson{background:white;color:#172135}.new-lesson small,.new-note{color:#34435b}}
@media(forced-colors:active){:where(.topbar,.category-nav,.demo-dock,.toolbar,.tile,.new-lesson,.card,.finder){background:Canvas!important;border:1px solid CanvasText!important;box-shadow:none!important}.master-tabs button[aria-selected=true],.category-nav button.active{outline:2px solid Highlight}.new-play{color:LinkText}}
@media(max-width:780px){.master-tabs{grid-template-columns:1fr 1.2fr .8fr 1.8fr}.master-tabs button{padding-inline:5px}}