/* ------------------------------------------------------------------
   Shell dei demo WebXR del Lab — contorno comune a tutte le pagine
   immersive: loader, back-button, pannello impostazioni, HUD.

   La pagina definisce solo --accent (e ciò che è specifico del mondo);
   tutto il resto vive qui. Caricato come <link>, quindi 'self': la CSP
   del sito lo consente senza whitelist aggiuntive.
   ------------------------------------------------------------------ */

:root {
    --accent: #00d4ff;
    --panel-bg: rgba(7, 10, 17, 0.84);
    --panel-border: rgba(255, 255, 255, 0.16);
}

* { box-sizing: border-box; }

body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    background: #000;
    font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
    color: #e8edf5;
}

#canvas-container { width: 100vw; height: 100vh; }

/* z-index massimo: da un demo a schermo intero si deve sempre poter uscire */
.back-btn {
    position: fixed; top: 14px; left: 14px; z-index: 2147483647;
    font: 600 14px/1 system-ui, -apple-system, sans-serif;
    color: #fff; background: rgba(10, 12, 16, .6);
    backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, .25); border-radius: 9px;
    padding: 9px 13px; text-decoration: none;
    box-shadow: 0 4px 18px rgba(0, 0, 0, .35);
}

#loader {
    position: fixed; inset: 0; z-index: 500;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    gap: 14px; background: #000;
    transition: opacity .6s ease;
}
#loader.hidden { opacity: 0; pointer-events: none; }
#loader .dot {
    width: 10px; height: 10px; border-radius: 50%;
    background: var(--accent); animation: pulse 1.2s ease-in-out infinite;
}
@keyframes pulse { 0%,100% { transform: scale(.6); opacity: .4 } 50% { transform: scale(1); opacity: 1 } }
#loader p { margin: 0; font-size: 14px; color: #9fb0c3; }
#loader a { color: var(--accent); }

#settings-toggle {
    position: fixed; top: 14px; right: 14px; z-index: 300;
    font: 600 13px/1 system-ui, sans-serif; color: #fff;
    background: var(--panel-bg); border: 1px solid var(--panel-border);
    border-radius: 9px; padding: 9px 13px; cursor: pointer;
    backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
#settings-toggle:hover { border-color: var(--accent); }

#panel {
    position: fixed; top: 56px; right: 14px; z-index: 290;
    width: 274px; max-height: calc(100vh - 80px); overflow-y: auto;
    background: var(--panel-bg); border: 1px solid var(--panel-border);
    border-radius: 12px; padding: 16px;
    backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
    opacity: 0; visibility: hidden; transform: translateY(-8px);
    transition: all .3s ease;
}
#panel.visible { opacity: 1; visibility: visible; transform: translateY(0); }
#panel h2 {
    margin: 0 0 12px; font-size: 13px; font-weight: 600;
    letter-spacing: .08em; text-transform: uppercase; color: #9fb0c3;
}

.row { margin-bottom: 13px; }
.row label {
    display: flex; justify-content: space-between;
    font-size: 12.5px; margin-bottom: 5px; color: #cdd7e3;
}
.row label span { color: var(--accent); font-variant-numeric: tabular-nums; }
.row.check label {
    justify-content: flex-start; gap: 8px; align-items: center;
    margin: 0; cursor: pointer;
}
.row.check input { accent-color: var(--accent); }
.row input[type=range] { width: 100%; accent-color: var(--accent); }
.row select {
    width: 100%; padding: 6px 8px; border-radius: 7px;
    background: #0d1320; color: #e8edf5;
    border: 1px solid var(--panel-border); font: 12.5px system-ui, sans-serif;
}

.btn-row { display: flex; gap: 8px; margin-top: 4px; }
.btn-row button {
    flex: 1; padding: 8px 0; border-radius: 8px; cursor: pointer;
    background: rgba(255, 255, 255, .08); color: #fff;
    border: 1px solid var(--panel-border); font: 600 12.5px system-ui, sans-serif;
}
.btn-row button:hover { border-color: var(--accent); }

#panel .hint {
    margin: 14px 0 0; font-size: 11.5px; line-height: 1.6; color: #8494a8;
    border-top: 1px solid var(--panel-border); padding-top: 11px;
}

#status {
    position: fixed; bottom: 14px; left: 14px; z-index: 200;
    font: 11px/1.6 ui-monospace, monospace; color: #6d7d92;
    background: rgba(7, 10, 17, .55); border-radius: 8px; padding: 7px 11px;
    backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
    pointer-events: none;
}
#status b { color: #9fb0c3; font-weight: 600; }

@media (max-width: 600px) {
    #panel { width: calc(100vw - 28px); }
    #status { display: none; }
}