/* Host controls for Claude's unmodified Delivery A scene. */
.scene-lab{scroll-margin-top:145px;border:1px solid var(--hairline);border-radius:24px;overflow:hidden;background:var(--surface);box-shadow:0 10px 35px #173f3308}
.scene-stage{position:relative;height:clamp(530px,62vw,660px);background:#e7f5f2}
.scene-mount{position:absolute;inset:0}
.scene-overlay-top{position:absolute;z-index:2;left:20px;right:20px;top:18px;display:flex;align-items:center;justify-content:space-between;gap:15px;pointer-events:none}
.scene-views{display:flex;gap:3px;padding:5px;border-radius:30px;border:1px solid #c9ded8;background:#fffffff0;box-shadow:0 3px 14px #173f330b;pointer-events:auto}
.scene-views button{min-height:44px;border:0;background:transparent;border-radius:23px;padding:10px 18px;color:#42665e;font-size:14px}
.scene-views button[aria-pressed=true]{background:#e3f2ed;color:#087974;font-weight:700}
.scene-facts{font-size:13px;color:#3b6860;background:#ffffffb8;border:1px solid #d5e7df;padding:11px 15px;border-radius:22px}
.scene-stage-hint{position:absolute;pointer-events:none;left:18px;right:18px;bottom:16px;text-align:center;font-size:13px;color:#496e67}
.scene-loading{position:absolute;inset:42% 20px auto;text-align:center;color:#42665e;font-size:16px;pointer-events:none}
.scene-toolbar{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:8px;padding:17px 20px 10px;border-top:1px solid var(--hairline)}
.scene-toolbar>button,.scene-zoom button{display:inline-flex;align-items:center;justify-content:center;gap:7px;min-height:44px;padding:10px 13px;border:1px solid var(--line);border-radius:11px;background:var(--surface);color:var(--teal);font-size:14px;transition:background .16s}
.scene-toolbar button:hover{background:var(--mint)}
.scene-toolbar button[aria-pressed=true]{background:var(--mint);border-color:color-mix(in srgb,var(--teal) 30%,var(--line))}
.scene-toolbar button:disabled,.scene-views button:disabled{opacity:.45}
.scene-zoom{display:flex;gap:4px}.scene-zoom button{width:44px;font-size:22px;padding:5px}
.scene-status{display:flex;justify-content:space-between;gap:15px;margin:0 24px;padding:5px 0 16px;font-size:13px;color:var(--muted);border-bottom:1px solid var(--hairline)}
.scene-explanation{padding:25px 27px;display:flex;align-items:flex-start;gap:20px;min-height:161px}
.scene-explanation-symbol{width:58px;height:58px;display:grid;place-items:center;border-radius:18px;flex-shrink:0;background:var(--mint);color:var(--teal);font:28px Georgia,serif;box-shadow:inset 0 1px 2px #fff5}
.scene-explanation>div{flex:1;min-width:0}
.scene-explanation .eyebrow{font-size:12px;margin:0 0 7px}
.scene-explanation h2{font-size:26px;letter-spacing:-.025em;margin:0 0 10px}
.scene-explanation-body{font-size:16px;line-height:1.8;color:var(--ink)}
.scene-explanation-more{font-size:14px;line-height:1.8;color:var(--muted);margin-top:5px}
.scene-explanation[data-part=proton] .scene-explanation-symbol{background:#f9e4bc;color:#86500c}
.scene-explanation[data-part=neutron] .scene-explanation-symbol{background:#dce5ec;color:#405564}
.scene-explanation[data-part=electron] .scene-explanation-symbol{background:var(--blue);color:#2e6be6}
.scene-listen{font-size:13px}
.scene-parts{display:flex;align-items:center;flex-wrap:wrap;gap:7px;padding:0 27px 22px}
.scene-parts>span{font-size:13px;color:var(--muted);margin-right:5px}
.scene-parts button{min-height:44px;padding:9px 12px;border:1px solid var(--hairline);border-radius:24px;font-size:13px;background:var(--bg);color:var(--ink)}
.scene-parts button:hover,.scene-parts button[aria-pressed=true]{border-color:var(--teal);color:var(--teal);background:var(--mint)}
.scene-model-note{margin:0 27px 20px;border-top:1px solid var(--hairline);padding-top:9px}
.scene-model-note summary{font-size:13px;cursor:pointer;color:var(--muted);min-height:44px;padding:12px 0}
.scene-model-note p{font-size:14px;line-height:1.8;color:var(--muted);margin:6px 0 12px}
.scene-error{margin:10px 25px;padding:13px 16px;background:var(--gold);font-size:15px;border-radius:10px}
.scene-load-fallback{display:grid;place-items:center;height:100%;font:50px Georgia,serif;color:#0b7772}
:root[data-theme=dark] .scene-stage{background:#0c232a}
:root[data-theme=dark] .scene-views{background:#16352bf2;border-color:#426b60;box-shadow:0 3px 14px #0003}
:root[data-theme=dark] .scene-views button{color:#bddecf}
:root[data-theme=dark] .scene-views button[aria-pressed=true]{background:#2c5b4c;color:#b1f2dd}
:root[data-theme=dark] .scene-facts{background:#16352bd9;color:#bddcce;border-color:#426b60}
:root[data-theme=dark] .scene-stage-hint{color:#a6c7bd}
@media(max-width:680px){
 .scene-lab{border-radius:19px;scroll-margin-top:130px}
 .scene-stage{height:610px}
 .scene-overlay-top{left:10px;right:10px;top:12px;justify-content:center;flex-wrap:wrap;gap:8px}
 .scene-views{width:100%;justify-content:space-between;padding:4px}.scene-views button{padding:9px 10px;font-size:13px;flex:1;white-space:nowrap}
 .scene-facts{font-size:12px;padding:7px 12px}
 .scene-stage-hint{font-size:13px;bottom:14px}
 .scene-toolbar{display:grid;grid-template-columns:1fr 1fr;gap:7px;padding:14px 13px 10px}
 .scene-toolbar>button{font-size:13px;padding:10px 8px;min-height:46px}.scene-zoom{justify-content:center}.scene-zoom button{flex:1}
 .scene-status{margin:0 15px;font-size:12px;gap:10px;padding-bottom:13px}
 .scene-explanation{padding:21px 16px;gap:13px;flex-wrap:wrap;min-height:0}
 .scene-explanation-symbol{width:42px;height:42px;font-size:23px;border-radius:13px}
 .scene-explanation h2{font-size:24px;line-height:1.2}.scene-explanation-body{font-size:16px;line-height:1.8}
 .scene-explanation>div{flex:1 1 calc(100% - 55px)}
 .scene-explanation .scene-listen{margin-left:55px;font-size:13px}
 .scene-parts{padding:0 16px 18px;gap:7px}.scene-parts>span{width:100%;margin-bottom:2px}.scene-parts button{font-size:13px;padding:9px 11px}
 .scene-model-note{margin:0 16px 15px}.scene-model-note summary{font-size:13px}.scene-error{margin:10px 16px;font-size:14px}
}

.scene-science-note{font-size:13px;line-height:1.8;color:var(--muted);padding:15px 27px 0;max-width:940px}
@media(max-width:680px){.scene-science-note{padding:13px 16px 0;font-size:13px}}

.guided-tour-details{border:1px solid var(--hairline);border-radius:15px;background:var(--surface);margin:0 0 18px;overflow:hidden}
.guided-tour-details>summary{display:flex;align-items:center;justify-content:space-between;gap:14px;list-style:none;cursor:pointer;min-height:53px;padding:13px 21px;font-size:14px;color:var(--teal)}
.guided-tour-details>summary::-webkit-details-marker{display:none}
.guided-tour-details>summary>span:first-child{font-weight:700}.guided-tour-details>summary>span:last-child{font-size:13px;color:var(--muted)}
.guided-tour-details summary b{font-weight:400;font-size:17px;margin-left:13px}.guided-tour-details[open] summary b{display:inline-block;transform:rotate(45deg)}
.guided-tour-details .guided-tour{border:0;border-top:1px solid var(--hairline);border-radius:0;margin:0;padding-top:18px}