/* Studio shell (PR3): 3D scenes, parallax, glow, worlds, Download Center, Py teacher additions. */
.studio { --px: 0; --py: 0; position: relative; width: 100%; height: clamp(240px, 38vw, 400px); margin: 14px 0 8px; border-radius: 18px; overflow: hidden; isolation: isolate;
  background: radial-gradient(120% 90% at 50% 100%, color-mix(in srgb, var(--acc) 38%, #0a0c1c), #0a0c1c 70%); border: 1px solid color-mix(in srgb, var(--acc) 55%, var(--line)); box-shadow: 0 0 0 1px color-mix(in srgb, var(--acc) 18%, transparent), 0 18px 50px color-mix(in srgb, var(--acc) 22%, transparent); contain: layout paint; }
.studio-poster, .studio-canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.studio-svg { width: 100%; height: 100%; display: block; }
.studio-canvas[hidden] { display: none; }
.studio.is-gl .studio-poster { visibility: hidden; }
.studio-glow { position: absolute; inset: 0; pointer-events: none; mix-blend-mode: screen; opacity: .55;
  background: radial-gradient(60% 50% at calc(50% + var(--px) * 8%) calc(40% + var(--py) * 6%), color-mix(in srgb, var(--acc) 55%, transparent), transparent 70%); }
.studio-title { position: absolute; left: 16px; bottom: 12px; margin: 0; padding: 4px 12px; border-radius: 99px; background: rgba(8, 10, 24, .62); color: #fff; font: 700 .9rem "Atkinson Hyperlegible", system-ui, sans-serif; backdrop-filter: blur(4px); }
.studio-badge { position: absolute; right: 10px; top: 10px; display: flex; align-items: center; gap: 6px; padding: 3px 10px; border-radius: 99px; background: rgba(8, 10, 24, .62); color: #fff; font: 600 .72rem "IBM Plex Mono", monospace; }
.sb-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--acc); box-shadow: 0 0 8px var(--acc); }
.studio-note { margin: 6px 0 16px; }
/* flat tier: three poster layers move at different depths */
.studio.is-flat .pl { transition: transform 120ms linear; }
.studio.is-flat .pl1 { transform: translate(calc(var(--px) * -3px), calc(var(--py) * -2px)); }
.studio.is-flat .pl2 { transform: translate(calc(var(--px) * -9px), calc(var(--py) * -5px)); }
.studio.is-flat .pl3 { transform: translate(calc(var(--px) * -18px), calc(var(--py) * -9px)) scale(1.03); }
.studio:not(.is-flat):not(.is-gl) .pl { animation: pl-drift 14s ease-in-out infinite alternate; }
.studio:not(.is-flat):not(.is-gl) .pl3 { animation-duration: 9s; }
@keyframes pl-drift { to { transform: translateX(-8px); } }
html[data-theme="contrast"] .studio { border-color: #fff; box-shadow: none; }
@media (prefers-reduced-motion: reduce) { .studio .pl { animation: none !important; transition: none !important; transform: none !important; } .studio-glow { opacity: .35; } }
/* home hero: the CSS cube stays until the WebGL lobby is ready (and for tiers off/flat) */
.hero3d .studio-compact { display: none; position: relative; height: 100%; min-height: 280px; margin: 0; }
.hero3d .studio-compact.is-gl { display: block; }
.hero3d:has(.studio-compact.is-gl) .stage3d { display: none; }
.hero3d .studio-compact .studio-badge { top: auto; bottom: 10px; }
/* worlds */
.lvl-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 12px; margin: 12px 0 18px; }
.lvl-card { position: relative; display: grid; gap: 4px; padding: 14px 14px 12px; border-radius: 16px; text-decoration: none; color: var(--ink); background: linear-gradient(160deg, color-mix(in srgb, var(--acc) 22%, var(--bg-elev)), var(--bg-elev) 62%); border: 1px solid color-mix(in srgb, var(--acc) 55%, var(--line)); transform: none; transition: transform 140ms, box-shadow 200ms; }
.lvl-card:hover, .lvl-card:focus-visible { box-shadow: 0 0 22px color-mix(in srgb, var(--acc) 45%, transparent); }
.lvl-n { position: absolute; right: 12px; top: 6px; font: 800 2.4rem "Fraunces", Georgia, serif; color: color-mix(in srgb, var(--acc) 70%, transparent); line-height: 1; }
.lvl-glyph { color: var(--acc); display: inline-flex; } .lvl-glyph svg { width: 28px; height: 28px; }
.lvl-name { font: 700 1.05rem "Fraunces", Georgia, serif; }
.lvl-blurb { font-size: .86rem; color: var(--muted); }
.lvl-meta { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 4px; }
.pill-ok { border-color: var(--ok); color: var(--ok); }
.lvl-two { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 14px; margin: 14px 0; }
.h1-glyph svg { width: .8em; height: .8em; vertical-align: -.05em; }
/* download center */
.dc-tools { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin: 12px 0 4px; }
.dc-tools input { flex: 1 1 220px; min-height: 44px; padding: 8px 12px; border-radius: 12px; border: 1px solid var(--line); background: var(--bg-elev); color: var(--ink); font: inherit; }
.dc-fmts { display: flex; flex-wrap: wrap; gap: 6px; }
.dc-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 420px), 1fr)); gap: 16px; margin: 12px 0 18px; }
.dc-card { display: flex; flex-direction: column; border-radius: 18px; overflow: hidden; background: var(--bg-elev); border: 1px solid color-mix(in srgb, var(--acc) 55%, var(--line)); transform: none; transition: transform 140ms, box-shadow 200ms; }
.dc-card[hidden] { display: none; }
.dc-card.is-focus, .dc-card:hover { box-shadow: 0 0 26px color-mix(in srgb, var(--acc) 40%, transparent); }
.dc-cover { position: relative; aspect-ratio: 16 / 9; background: linear-gradient(135deg, var(--acc), #12142b); } .dc-cover img { width: 100%; height: 100%; display: block; object-fit: cover; }
.dc-brand-stamp { position: absolute; right: 10px; bottom: 8px; display: inline-flex; align-items: center; gap: 6px; padding: 3px 10px 3px 6px; border-radius: 99px; background: rgba(18, 12, 44, 0.86); color: #fde68a; border: 1.5px solid #f4b942; font: 700 0.72rem "IBM Plex Mono", monospace; pointer-events: none; box-shadow: 0 2px 8px rgba(0, 0, 0, 0.35); }
.dc-brand-banner { margin: 8px 0 6px; }
.cm-brand-pill { display: inline-flex; align-items: center; gap: 10px; padding: 6px 14px 6px 8px; border-radius: 999px; background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 18%, var(--bg-elev)), var(--bg-elev)); border: 1.5px solid var(--accent); color: var(--ink); text-decoration: none; box-shadow: 0 4px 14px rgba(0, 0, 0, 0.12); }
.cm-brand-meta { display: flex; flex-direction: column; line-height: 1.15; }
.cm-brand-title { font-size: 0.86rem; font-weight: 800; }
.cm-brand-domain { font-size: 0.74rem; font-weight: 700; color: var(--accent-2); font-family: "IBM Plex Mono", monospace; }
.pill-brand { border-color: #f4b942; font-weight: 700; }
.wl-zodiac { display: flex; flex-direction: column; align-items: center; gap: 2px; }
.wl-domain { font-size: 0.62rem; font-weight: 700; color: var(--accent-2); font-family: "IBM Plex Mono", monospace; line-height: 1; }
.wl-brand-inline { font-size: 0.78rem; font-weight: 700; color: var(--accent-2); }
.dc-body { padding: 14px 16px 16px; } .dc-body h2 { margin: 6px 0; }
.dc-files { list-style: none; padding: 0; margin: 10px 0; display: grid; gap: 8px; }
.dc-file[hidden] { display: none; }
.dc-btn { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 10px; min-height: 48px; padding: 8px 12px; border-radius: 12px; text-decoration: none; color: var(--ink); background: color-mix(in srgb, var(--acc) 16%, var(--bg)); border: 1px solid color-mix(in srgb, var(--acc) 60%, var(--line)); font-weight: 700; position: relative; z-index: 2; touch-action: manipulation; scroll-margin-top: 96px; scroll-margin-bottom: 220px; }
.dc-btn:hover, .dc-btn:focus-visible { background: color-mix(in srgb, var(--acc) 32%, var(--bg)); }
.dc-chip { font: 800 .72rem "IBM Plex Mono", monospace; padding: 3px 7px; border-radius: 6px; background: var(--acc); color: #10142a; }
.dc-size { font-weight: 400; color: var(--muted); font-size: .85rem; }
.dc-desc { display: block; margin: 3px 4px 0; font-size: .86rem; color: var(--muted); }
.dc-fn { display: block; font: .72rem "IBM Plex Mono", monospace; opacity: .8; word-break: break-all; }
.dc-sums code { font-size: .68rem; word-break: break-all; }
@media (hover: hover) and (pointer: fine) {
  .dc-card.is-tilting, .lvl-card.is-tilting { transform: perspective(900px) rotateX(var(--tx, 0deg)) rotateY(var(--ty, 0deg)); }
}
@media (max-width: 899px) {
  /* The bot sits in the lower-right corner. Keep the whole download control to its left so a finger on the right edge still hits the link. */
  .dc-files { padding-right: calc(114px * var(--py-s, 1.18) + 22px); }
}
@media (prefers-reduced-motion: reduce) { .lvl-card, .dc-card { transform: none !important; transition: none; } }
/* Py teacher */
.bp-bot { margin: 0 0 8px; padding: 6px 10px; border-radius: 10px; background: color-mix(in srgb, #ffd43b 22%, var(--bg-elev)); font-size: .85rem; font-weight: 700; }
.bp-teach { margin: 10px 0; padding-top: 4px; border-top: 1px dashed var(--line); }
.bp-rung { margin: 6px 0; padding: 8px 10px; border-radius: 10px; background: color-mix(in srgb, var(--accent) 12%, var(--bg-elev)); border: 1px solid var(--line); font-size: .88rem; }
.bp-rung p, .bp-rung ol { margin: 4px 0; padding-left: 0; } .bp-rung ol { padding-left: 1.2em; }
.bp-code { margin: 4px 0; padding: 8px; border-radius: 8px; background: var(--code-bg); overflow: auto; font-size: .78rem; }
.bp-note { font-size: .78rem; color: var(--muted); margin: 4px 0; }
.bp-socratic { margin: 4px 0; font-style: italic; }
.bot-mood { position: absolute; left: 50%; top: 2px; transform: translateX(-50%); min-width: 26px; padding: 1px 8px; border-radius: 99px; background: #fff; color: #10233a; border: 2px solid #ff5da2; font: 800 .8rem "IBM Plex Mono", monospace; text-align: center; pointer-events: none; z-index: 3; }
.bot-mood:empty { display: none; }
.bot[data-mood="cheer"] .bot-figure { animation: bot-cheer 600ms ease 3; filter: drop-shadow(0 0 14px #34d399) drop-shadow(0 0 22px #ffd43b); }
.bot[data-mood="puzzled"] .bot-figure { animation: bot-puzzle 700ms ease 2; }
.bot[data-mood="drag"] .bot-figure { transform: rotate(-8deg) scale(1.06); animation: none; }
.bot[data-mood="think"] .bot-figure { filter: drop-shadow(0 0 10px #22d3ee); }
@keyframes bot-cheer { 0%, 100% { transform: translateY(0); } 40% { transform: translateY(-16px) rotate(-6deg); } 70% { transform: translateY(-6px) rotate(5deg); } }
@keyframes bot-puzzle { 0%, 100% { transform: rotate(0); } 30% { transform: rotate(-9deg); } 70% { transform: rotate(8deg); } }
@media (prefers-reduced-motion: reduce) { .bot[data-mood] .bot-figure { animation: none !important; transform: none !important; } }
.quality { margin: 8px 0; display: flex; flex-wrap: wrap; gap: 6px; } .quality-h { flex-basis: 100%; margin: 0; font-size: .78rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); } .quality-note { flex-basis: 100%; margin: 2px 0 0; font-size: .74rem; color: var(--muted); }
/* Audio lessons & challenge cards */
.audio-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 14px; margin: 12px 0 20px; }
.audio-card { padding: 14px 16px; border-radius: 16px; border: 1px solid var(--line); background: linear-gradient(155deg, color-mix(in srgb, var(--accent) 14%, var(--bg-elev)), var(--bg-elev)); display: flex; flex-direction: column; gap: 8px; }
.audio-card h3 { margin: 0; font-size: 1.05rem; }
.audio-card p { margin: 0; font-size: 0.9rem; color: var(--muted); }
.audio-card audio { width: 100%; max-width: 100%; height: 38px; margin-top: 4px; }
.challenge-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 14px; margin: 12px 0 20px; }
.challenge-card { padding: 16px; border-radius: 16px; border: 1px solid color-mix(in srgb, var(--accent) 55%, var(--line)); background: var(--bg-elev); display: flex; flex-direction: column; gap: 8px; }
.challenge-card h3 { margin: 0; font-size: 1.08rem; }
.challenge-card pre { margin: 4px 0; padding: 10px; border-radius: 10px; background: var(--code-bg); overflow-x: auto; font-size: 0.82rem; }
/* howto additions */
.howto-steps { display: flex; gap: 8px; margin: 0 0 10px; flex-wrap: wrap; } .howto-steps span { padding: 4px 10px; border-radius: 99px; background: color-mix(in srgb, var(--accent) 22%, var(--bg-elev)); font-weight: 700; font-size: .82rem; }
@media (max-width: 899px) { .top-links a[href="#/worlds"] { display: none; } }
@media print { .studio { display: none; } }

.studio-floor { margin: 18px 0 8px; }
.studio-host { display: flex; gap: 16px; align-items: center; }
.cm-host-svg { flex: 0 0 auto; animation: host-bob 3.2s ease-in-out infinite; }
.station-stage { display: grid; grid-template-columns: repeat(auto-fit, minmax(148px, 1fr)); gap: 12px; perspective: 900px; margin: 8px 0 18px; }
.station {
  display: flex; flex-direction: column; gap: 6px; min-height: 96px; padding: 14px;
  border-radius: 16px; text-decoration: none; color: var(--ink);
  background: linear-gradient(160deg, color-mix(in srgb, var(--accent) 22%, var(--bg-elev)), var(--bg-elev));
  border: 1px solid color-mix(in srgb, var(--accent) 45%, var(--line));
  transform: rotateX(8deg) rotateY(-8deg);
  transition: transform 160ms ease;
}
.station:hover, .station:focus-visible { transform: rotateX(0) rotateY(0) translateY(-2px); }
.concept-grid, .example-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; }
.concept, .studio-example { padding: 12px; border: 1px solid var(--line); border-radius: 14px; background: var(--bg-elev); }
.stack-view { display: flex; flex-direction: column-reverse; gap: 6px; min-height: 72px; margin: 8px 0; }
.stack-view span, .list-view li { padding: 6px 8px; border-radius: 8px; background: color-mix(in srgb, var(--accent) 18%, var(--bg)); }
.list-view { margin: 8px 0; padding-left: 1.2rem; }
.studio-out { min-height: 2.4rem; white-space: pre-wrap; }
@keyframes host-bob { 50% { transform: translateY(-4px); } }
@media (prefers-reduced-motion: reduce) {
  .cm-host-svg, .station { animation: none; transform: none; }
}