/* Allineamento al design system. Si carica per ultimo: porta i componenti
   esistenti sulle regole del sistema (vetro, pulsanti, lavagna) senza
   riscrivere i fogli storici. Solo token, nessun colore letterale. */

body { font-family: var(--font-sans); }

/* --- Pulsanti: un solo primario, in gradiente blu --------------------- */
.primary, .home-simulate, .is-immersive .simulation-bar #run-button, .learn-start, .lesson-next {
  background: linear-gradient(180deg, var(--accent-top), var(--accent));
  color: var(--on-accent);
  border-color: transparent;
  box-shadow: var(--shadow-accent), var(--shadow-glint);
}
/* Al passaggio il gradiente resta lo stesso: si scurisce con un velo interno
   che ha la sua transizione. Cambiare il gradiente con un colore pieno fa
   saltare il pulsante, perche' un gradiente non si interpola. */
.primary, .home-simulate, .is-immersive .simulation-bar #run-button, .learn-start, .lesson-next {
  transition: box-shadow var(--dur-move) var(--ease), color var(--dur-move) var(--ease), opacity var(--dur-move) var(--ease);
}
.primary:hover, .home-simulate:hover, .is-immersive .simulation-bar #run-button:hover, .learn-start:hover, .lesson-next:hover,
.primary:focus-visible, .home-simulate:focus-visible {
  background: linear-gradient(180deg, var(--accent-top), var(--accent));
  box-shadow: inset 0 0 0 100vmax color-mix(in srgb, var(--accent-strong) 22%, transparent), var(--shadow-accent), var(--shadow-glint);
}
.primary:active, .home-simulate:active, .is-immersive .simulation-bar #run-button:active {
  background: linear-gradient(180deg, var(--accent-top), var(--accent));
  box-shadow: inset 0 0 0 100vmax color-mix(in srgb, var(--accent-strong) 45%, transparent), var(--shadow-glint);
}
.home-create, .theme-toggle, .import-button, .workspace-view.is-board #fullscreen-toggle, .workspace-view.is-board .board-controls #scene-parameters, .is-immersive .simulation-bar .scene-parameters {
  background: var(--glass-panel);
  border: 1px solid var(--glass-edge);
  box-shadow: var(--shadow-rest), var(--shadow-glint);
  color: var(--ink);
}
.theme-toggle { border-radius: var(--radius-pill); min-height: 36px; padding-inline: var(--space-16); }

/* --- Navigazione: la voce corrente e' una pillola di vetro ------------- */
.topbar nav a { border-radius: var(--radius-pill); border-bottom: 0; padding: 0 var(--space-16); }
.topbar nav { align-self: center; height: 40px; }
.topbar nav a:hover { background: var(--glass-card); color: var(--ink); }
.topbar nav a[aria-current="page"] { color: var(--accent-strong); background: var(--glass-panel); box-shadow: var(--shadow-rest), var(--shadow-glint); }

/* --- Vetro: tre livelli -------------------------------------------------- */
.catalog-card, .saved-card, .toolbox, .home-model-toggle, .learn-columns section, .learn-atlas-card, .learn-card-link, .learn-lesson {
  background: var(--glass-card);
  border-color: var(--glass-edge);
  -webkit-backdrop-filter: blur(var(--blur-card)); backdrop-filter: blur(var(--blur-card));
}
.catalog-card, .saved-card, .learn-atlas-card { box-shadow: var(--shadow-float), var(--shadow-glint); }
.canvas-pane, .inspector, .lesson-guide, .is-immersive .simulation-bar, .is-immersive.parameters-open .inspector {
  background: var(--glass-panel);
  border-color: var(--glass-edge);
  box-shadow: var(--shadow-panel), var(--shadow-glint);
  -webkit-backdrop-filter: blur(var(--blur-panel)); backdrop-filter: blur(var(--blur-panel));
}
.home-model-menu, #observation-options {
  background: var(--glass-menu);
  border-color: var(--glass-edge);
  box-shadow: var(--shadow-float), var(--shadow-glint);
  -webkit-backdrop-filter: blur(var(--blur-menu)); backdrop-filter: blur(var(--blur-menu));
  border-radius: var(--radius-lg);
}
.is-immersive .simulation-bar { border-radius: var(--radius-pill); }
.is-immersive .simulation-bar #run-button, .is-immersive .simulation-bar .scene-parameters { border-radius: var(--radius-pill); }

/* --- Campi e slider ------------------------------------------------------ */
.experiment-control input, .schedule-controls input, .filters select, .inspector input, .inspector select {
  border-color: var(--line-strong);
  background: var(--surface);
  color: var(--ink);
  border-radius: var(--radius-xs);
  font-variant-numeric: tabular-nums;
}
input[type="range"] { accent-color: var(--accent); }
.is-immersive input[type="range"]::-webkit-slider-runnable-track { background: var(--surface-sunken); box-shadow: inset 0 0 0 1px var(--line); }
.is-immersive input[type="range"]::-webkit-slider-thumb { background: var(--accent); border: 3px solid var(--surface); box-shadow: var(--shadow-rest); }

/* --- Focus da tastiera: uguale ovunque ---------------------------------- */
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }

/* --- Lavagna ------------------------------------------------------------- */
/* Stock: vasca con contorno inchiostro, acqua nel colore dell'acqua. */
.node-stock .node-shape, html[data-look="sky"] .node-stock .node-shape { fill: var(--surface); stroke: var(--ink); stroke-width: var(--stroke-node); }
.stock-level, html[data-look="sky"] .stock-level { fill: var(--water); }
/* Variabile: un calcolo, contorno leggero. */
.node-shape-variable, html[data-look="sky"] .node-variable .node-shape { fill: var(--surface); stroke: var(--ink-faint); }
/* Parametro: si tocca, quindi e' blu come ogni controllo. */
.node-constant .node-shape, .node-shape-constant, html[data-look="sky"] .node-constant .node-shape { fill: var(--accent-soft); stroke: var(--lever); stroke-width: var(--stroke-node); }
.node-constant .node-value { fill: var(--accent-strong); font-weight: 650; }
.node.is-source .node-shape, html[data-look="sky"] .node.is-source .node-shape { stroke: var(--lever); }
/* Valvola: farfalla blu, si regola. */
.node-shape-flow { fill: var(--surface); stroke: var(--ink); }
.flow-valve { fill: var(--accent); }
/* Nuvole fuori dal confine. */
.cloud-shape { fill: var(--surface); stroke: var(--cloud); }
.cloud-pipe-outer { fill: var(--cloud); }
/* Segni sugli archi: il dischetto e' pieno, il segno ha il suo colore. */
.edge .edge-badge, html[data-look="sky"] .edge .edge-badge { fill: var(--surface); }
/* Numeri sulla lavagna e nei grafici: cifre tabellari. */
.node-value, .chart-value, .chart-axis-label, .zoom-level, #time-output, .inspector-value { font-variant-numeric: tabular-nums; }
.chart-value { font-weight: 700; color: var(--accent-strong); }

/* --- Legenda e palette: stessi simboli della lavagna --------------------- */
.constant-shape, .mini.constant { border-color: var(--lever); background: var(--accent-soft); }
.legend-line.positive { background: var(--flow-in); }
.legend-line.negative { background: var(--flow-out); }

@media (prefers-reduced-motion: reduce) {
  .primary, .home-simulate { transition: none; }
}

/* Occhielli: il maiuscoletto lo fa lo stile, non il testo. */
.is-immersive .scene-panel-head span { text-transform: uppercase; font-size: var(--fs-2xs); font-weight: 800; letter-spacing: .14em; }
/* Lo stato del modello si mostra solo quando c'e' qualcosa da correggere. */
.model-status:empty { display: none; }

#run-button { display: inline-flex; align-items: center; justify-content: center; gap: var(--space-8); }

/* Regola: al passaggio del mouse niente si sposta e niente cambia misura.
   Un elemento che sale di 2-3px esce da sotto il puntatore sul bordo, perde
   il :hover, ricade, lo riprende: e' lo sfarfallio. Il riscontro e' fatto
   solo di colore, bordo e ombra, con transizione. */
.home-simulate:hover, .home-create:hover, .catalog-card:hover, .saved-card:hover, .block-palette button:hover,
.learn-lesson:hover, .learn-card-link:hover, .learn-atlas-card:hover, .home-model-toggle:hover { transform: none; }
.catalog-card, .saved-card, .home-create, .theme-toggle, .import-button, .block-palette button, .learn-lesson, .learn-card-link, .learn-back, .learn-bin, .topbar nav a, .zoom-button, .back-link, .quiet, .secondary {
  transition: background-color var(--dur-move) var(--ease), border-color var(--dur-move) var(--ease), box-shadow var(--dur-move) var(--ease), color var(--dur-move) var(--ease);
}
.catalog-card:hover, .saved-card:hover { border-color: color-mix(in srgb, var(--accent) 45%, var(--glass-edge)); box-shadow: var(--shadow-float), var(--shadow-glint), 0 0 0 1px color-mix(in srgb, var(--accent) 25%, transparent); }
.home-create:hover { background: var(--glass-menu); border-color: color-mix(in srgb, var(--accent) 40%, var(--glass-edge)); box-shadow: var(--shadow-panel), var(--shadow-glint); }
.theme-toggle:hover, .import-button:hover { background: var(--glass-menu); color: var(--ink); }
.block-palette button:hover { border-color: var(--accent); background: var(--accent-soft); }
/* Sulla lavagna il passaggio colora il contorno ma non lo ingrossa: un
   contorno piu' spesso allarga la forma sotto il puntatore. */
html[data-look="sky"] .node:hover:not(.is-selected) .node-shape { stroke-width: var(--stroke-node); }

/* La barra in alto resta ferma mentre la pagina scorre: senza un fondo il
   testo le passava sotto e si sovrapponeva al marchio. Vetro leggero. */
.topbar {
  background: color-mix(in srgb, var(--sky) 72%, transparent);
  -webkit-backdrop-filter: blur(var(--blur-panel)) saturate(1.2);
  backdrop-filter: blur(var(--blur-panel)) saturate(1.2);
}
.is-immersive .topbar, html[data-view="home"] .topbar { background: transparent; -webkit-backdrop-filter: none; backdrop-filter: none; }

/* Studio sotto i 1050px: gli elementi stanno in una riga sopra, la lavagna
   prende tutto lo spazio. Una regola a 1250px, scritta dopo, rimetteva tre
   colonne e schiacciava la lavagna a pochi pixel. */
@media (max-width: 1050px) {
  .studio-layout:not(.exploring) { grid-template-columns: minmax(0, 1fr) 270px; }
}

/* Studio senza selezione: il pannello di destra non c'e' e la lavagna prende
   la sua colonna. Torna appena si seleziona qualcosa; il disegno resta fermo
   dov'era (app.js ricalcola solo la cornice, non l'inquadratura). */
.studio-layout.inspector-idle > #scene-inspector { display: none; }
.studio-layout.inspector-idle { grid-template-columns: 190px minmax(0, 1fr); }
.studio-layout.inspector-idle.exploring { grid-template-columns: minmax(0, 1fr); }
@media (max-width: 1250px) { .studio-layout.inspector-idle { grid-template-columns: 164px minmax(0, 1fr); } }
@media (max-width: 1050px) { .studio-layout.inspector-idle, .studio-layout.inspector-idle.exploring { grid-template-columns: minmax(0, 1fr); } }

/* Come si legge la lavagna: un rimando di testo che apre la legenda solo a chi la chiede. */
.canvas-head-start { display: flex; align-items: center; gap: 12px; position: relative; }
.board-help { position: relative; }
.board-help summary { list-style: none; cursor: pointer; color: var(--accent); font-size: var(--fs-xs); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
.board-help summary::-webkit-details-marker { display: none; }
.board-help-body { position: absolute; z-index: 20; top: 28px; left: 0; width: 330px; display: grid; gap: 8px; padding: 16px; border: 1px solid var(--line); border-radius: 12px; background: var(--paper-raised); box-shadow: 0 12px 32px #0003; color: var(--ink-soft); font-size: var(--fs-xs); line-height: 1.4; }
.board-help-body span { display: flex; align-items: center; gap: 10px; }
.board-help-body .toolbox-title { margin: 4px 0 0; }
.board-help-body .toolbox-title:first-child { margin-top: 0; }
.board-help-body i { flex: none; }
.board-help-gesture { margin: 4px 0 0; padding-top: 8px; border-top: 1px solid var(--line); }
.mini.flow { width: 14px; height: 14px; margin: 0 3px; border-radius: 50%; }
.mini.cloud { width: 20px; height: 12px; border-radius: 8px; border-color: var(--cloud, var(--ink-faint)); }
.legend-line.pipe { height: 6px; background: transparent; border-top: 2px solid var(--ink-faint); border-bottom: 2px solid var(--ink-faint); }
.board-help-body .legend-line { flex: none; }
.board-help-body { max-height: min(72vh, 640px); overflow-y: auto; }
.board-help-keys { display: grid; grid-template-columns: auto 1fr; gap: 6px 12px; margin: 0; }
.board-help-keys dt { color: var(--ink); font-weight: 600; white-space: nowrap; }
.board-help-keys dd { margin: 0; }
.board-help-note { margin: 0; }
/* il rettangolo che sceglie gli elementi, con Maiuscole e trascinando sul vuoto */
.selection-box { position: absolute; z-index: 5; border: 1.5px solid var(--accent); border-radius: 2px; background: color-mix(in srgb, var(--accent) 12%, transparent); pointer-events: none; }

/* I campi di testo e i menu a tendina hanno il bordo forte (3,45:1 sul pannello): con il filetto chiaro
   (1,46:1) quasi non si vedevano. Il fuoco tiene il suo colore. */
input:not([type="range"]):not([type="checkbox"]):not([type="radio"]):not([type="color"]):not(:focus), select:not(:focus), textarea:not(:focus) { border-color: var(--line-strong); }