/* Scheda «Strutture» nella cassetta dello Studio.
   Usa solo i token del design system: vetro, accento, raggi e spazi. */

.toolbox-tabs { display: flex; gap: 2px; padding: 3px; margin: 0 0 var(--space-12, 12px); border-radius: var(--radius-pill); background: var(--surface-sunken, rgba(0,0,0,.05)); border: 1px solid var(--glass-edge, var(--line)); }
.toolbox-tabs [role="tab"] { flex: 1; min-height: 32px; padding: 0 var(--space-8, 8px); border: 0; border-radius: var(--radius-pill); background: transparent; color: var(--ink-soft); font: 650 13px/1 var(--font-sans); cursor: pointer; transition: background-color var(--dur-move, .2s) var(--ease, ease), color var(--dur-move, .2s) var(--ease, ease), box-shadow var(--dur-move, .2s) var(--ease, ease); }
.toolbox-tabs [role="tab"]:hover { color: var(--ink); }
.toolbox-tabs [role="tab"][aria-selected="true"] { background: var(--surface, #fff); color: var(--accent-strong); box-shadow: var(--shadow-rest), var(--shadow-glint); }
.toolbox-tabs [role="tab"]:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
.toolbox-panel[hidden] { display: none !important; }

.structure-palette { display: grid; gap: var(--space-8, 8px); }
.structure-palette button { display: flex; align-items: center; gap: var(--space-12, 12px); min-height: 54px; padding: var(--space-8, 8px); border: 1px solid var(--glass-edge, var(--line)); border-radius: var(--radius-sm); background: var(--glass-card); color: var(--ink); text-align: left; cursor: grab; touch-action: none; transition: background-color var(--dur-tap, .12s) var(--ease, ease), border-color var(--dur-tap, .12s) var(--ease, ease), transform var(--dur-tap, .12s) var(--ease, ease); }
.structure-palette button:hover { background: var(--glass-panel); border-color: var(--accent); }
.structure-palette button:active { cursor: grabbing; }
.structure-palette button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.structure-curve { flex: none; width: 34px; height: 28px; padding: 4px 3px; border-radius: var(--radius-xs, 6px); background: var(--accent-soft); color: var(--accent-strong); }
.structure-curve path { fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.structure-palette span { display: grid; gap: 2px; min-width: 0; }
.structure-palette b { font: 650 13px/1.25 var(--font-sans); }
.structure-palette small { color: var(--ink-faint); font: 500 11.5px/1.3 var(--font-sans); }
.structure-target { margin: var(--space-4, 4px) 0 0; padding: var(--space-8, 8px); border-radius: var(--radius-sm); color: var(--ink-faint); font: 500 12px/1.4 var(--font-sans); border: 1px dashed var(--line); }
.structure-target.is-ready { color: var(--accent-strong); border-style: solid; border-color: color-mix(in srgb, var(--accent) 35%, transparent); background: var(--accent-soft); }

@media (max-width: 1250px) {
  .structure-palette small { display: none; }
}
@media (max-width: 1050px) {
  .toolbox > div.toolbox-tabs { display: flex; flex: none; margin: 0; flex-direction: column; border-radius: var(--radius-sm); }
  .toolbox-tabs [role="tab"] { border-radius: var(--radius-xs, 6px); }
  .toolbox { min-width: 0; }
  .toolbox-panel { flex: 1; display: flex; align-items: center; gap: 8px; min-width: 0; overflow-x: auto; scrollbar-width: thin; }
  .toolbox-panel > div:first-child, .toolbox-panel .toolbox-guide, .toolbox-panel .legend { display: none; }
  .structure-palette { display: flex; }
  .structure-palette button { flex: none; }
  .structure-target { display: none; }
}

/* Famiglie di strutture */
.structure-group { display: grid; gap: var(--space-8, 8px); }
.structure-group-title { margin: var(--space-8, 8px) 0 0; color: var(--ink-faint); font: 800 12px/1.2 var(--font-sans); letter-spacing: .12em; text-transform: uppercase; }
.structure-target { margin: 0 0 var(--space-4, 4px); }
#toolbox-structures { max-height: calc(100vh - 260px); overflow-y: auto; overflow-x: hidden; scrollbar-width: thin; padding-right: 2px; }
.structure-group > button { width: 100%; min-width: 0; }
.structure-palette b, .structure-palette small { overflow-wrap: break-word; hyphens: manual; }
/* Con le Strutture aperte la cassetta si allarga: in 175 px i nomi andavano a
   capo col trattino («par-te», «scar-to») e le schede diventavano alte. */
@media (min-width: 1051px) {
  .studio-layout:not(.exploring):has(#toolbox-tab-structures[aria-selected="true"]) { grid-template-columns: 244px minmax(560px, 1fr) 286px; }
  .studio-layout.inspector-idle:not(.exploring):has(#toolbox-tab-structures[aria-selected="true"]) { grid-template-columns: 244px minmax(0, 1fr); }
}
@media (min-width: 1051px) and (max-width: 1250px) {
  .studio-layout:not(.exploring):has(#toolbox-tab-structures[aria-selected="true"]) { grid-template-columns: 224px minmax(480px, 1fr) 260px; }
  .studio-layout.inspector-idle:not(.exploring):has(#toolbox-tab-structures[aria-selected="true"]) { grid-template-columns: 224px minmax(0, 1fr); }
}
@media (max-width: 1050px) {
  .structure-group { display: flex; align-items: center; }
  .structure-group-title { display: none; }
  #toolbox-structures { max-height: none; overflow: visible; padding-right: 0; }
  .structure-group > button { width: auto; }
}

/* Navigazione e schede come testo con un filetto sotto la voce attiva, non pillole. */
.topbar nav a, .topbar nav a:hover, .topbar nav a[aria-current="page"] { border-radius: 0; background: transparent; box-shadow: none; }
.topbar nav a[aria-current="page"] { text-decoration: underline; text-decoration-thickness: 2px; text-underline-offset: 8px; }
.toolbox-tabs { padding: 0; border: 0; border-bottom: 1px solid var(--line); border-radius: 0; background: transparent; }
.toolbox-tabs [role="tab"], .toolbox-tabs [role="tab"][aria-selected="true"] { border-radius: 0; background: transparent; box-shadow: none; }
.toolbox-tabs [role="tab"][aria-selected="true"] { box-shadow: inset 0 -2px 0 var(--accent); }

/* Schede dei sistemi pronti: il livello e' testo, non un'etichetta a pillola. */
.catalog-card .status { padding: 0; border-radius: 0; background: none; color: var(--ink-soft); font-weight: 600; }
.catalog-card .tags:empty { display: none; }
.library-intro { max-width: 60ch; color: var(--ink-soft); }

/* Il bersaglio della struttura e' una frase, non un campo: niente riquadro. */
.structure-target, .structure-target.is-ready { padding: 0; border: 0; border-radius: 0; background: none; }
.structure-target.is-ready { color: var(--accent-strong); font-weight: 600; }

/* Lavagna a schermo intero: la cassetta e' una colonna, l'elenco scorre fino
   in fondo (prima si fermava a un'altezza fissa e sotto restava il vuoto) e
   sfuma ai bordi invece di tagliare le righe sotto le schede. */
.workspace-view.is-fullscreen .studio-layout:not(.exploring) > .toolbox { display: flex; flex-direction: column; overflow: hidden; }
.workspace-view.is-fullscreen .toolbox > .toolbox-panel:not([hidden]) { flex: 1; min-height: 0; overflow-y: auto; scrollbar-width: thin; }
.workspace-view.is-fullscreen #toolbox-structures { max-height: none; }
#toolbox-structures, .workspace-view.is-fullscreen .toolbox > .toolbox-panel:not([hidden]) {
  -webkit-mask-image: linear-gradient(transparent, #000 14px, #000 calc(100% - 14px), transparent);
  mask-image: linear-gradient(transparent, #000 14px, #000 calc(100% - 14px), transparent);
  padding-top: 8px; padding-bottom: 14px;
}
@media (max-width: 1050px) {
  #toolbox-structures, .workspace-view.is-fullscreen .toolbox > .toolbox-panel:not([hidden]) { -webkit-mask-image: none; mask-image: none; padding-top: 0; padding-bottom: 0; }
}

/* «Torna al simulatore» e' un rimando, non un pulsante a pillola: testo con
   la freccia indietro, come «Impara» nell'Atlante. */
.workspace-view.is-board #fullscreen-toggle { display: inline-flex; align-items: center; gap: 6px; border: 0; border-radius: 0; padding: 6px 2px; background: none; box-shadow: none; color: var(--accent-strong); font-weight: 600; }
.workspace-view.is-board #fullscreen-toggle::before { content: ""; width: 16px; height: 16px; background: currentColor; -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M19 12H5m6-6-6 6 6 6'/%3E%3C/svg%3E") center / contain no-repeat; mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M19 12H5m6-6-6 6 6 6'/%3E%3C/svg%3E") center / contain no-repeat; }
.workspace-view.is-board #fullscreen-toggle:hover { text-decoration: underline; text-underline-offset: 4px; }

/* Sistemi pronti: la scheda e' alta quanto il suo testo (prima 300 px fissi,
   con un vuoto sopra «Apri»); sugli schermi larghi quattro colonne. */
.catalog-card { min-height: 0; }
.catalog-card > footer { margin-top: auto; padding-top: 16px; }
@media (min-width: 1600px) { .catalog-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); } }