:root {
  --color-bg: #f4f5f7;
  --color-panel: #ffffff;
  --color-card: #f8f9fb;
  --color-border: #dfe2e8;
  --color-text: #1d2330;
  --color-muted: #697386;
  --color-accent: #5b4fd6;
  --color-accent-soft: rgb(91 79 214 / 0.12);
  --color-accent-text: #ffffff;
  --color-danger: #c8463d;
  --color-on-axis: #ffffff;
  --color-overlay: rgb(15 18 25 / 0.45);
  --shadow-pop: 0 6px 24px rgb(0 0 0 / 0.16);

  /* assi: X rosso, Y verde, Z blu (UI e scena) */
  --color-axis-x: #d63c3c;
  --color-axis-y: #2a9a4a;
  --color-axis-z: #2f6fed;

  /* colori della scena 3D, letti dai moduli JS */
  --color-scene-bg: #eceef2;
  --color-solid: #c9d3e3;
  --color-edge: #3a4252;
  --color-curve-soft: #7a6fe0;
  --color-edge-hover: #f2a024;
  --color-edge-selected: #e8590c;
  --color-node: #ffffff;
  --color-junction: #3a4252;
  --color-node-outline: #3a4252;
  --color-anchor-active: #e8590c;
  --color-connect: #d6336c;
  --color-handle: #e8590c;
  --color-handle-line: #e8590c;
  --color-plane: #5b4fd6;
  --color-select: #5b4fd6;
  --color-quote: #3a4252;

  /* piano di lavoro */
  --color-plane-surface: #ffffff;
  --plane-surface-opacity: 0.6;
  --color-grid-minor: #b4bbc8;
  --grid-minor-opacity: 0.5;
  --color-grid-major: #8a93a3;
  --grid-major-opacity: 0.85;

  /* cubo di orientamento */
  --color-viewcube-face: #f4f6fa;
  --color-viewcube-edge: #9aa1ae;
  --color-viewcube-text: #3a4252;
  --color-viewcube-hover: #5b4fd6;

  --color-tag-bg: rgb(255 255 255 / 0.96);

  /* altri oggetti attenuati in Modifica forma */
  --dim-solid-opacity: 0.22;
  --dim-solid-lighten: 0.45;
  --dim-line-opacity: 0.25;

  /* alleggerimento della scena in modalita' B */
  --fade-solid-opacity: 0.32;
  --fade-solid-lighten: 0.35;
  --fade-dim-opacity: 0.2;
  --fade-ms: 220;

  --radius-sm: 6px;
  --radius-md: 10px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --panel-width: 280px;
  --menubar-height: 34px;
  --viewcube-size: 110px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

[data-theme="dark"] {
  --color-bg: #15181e;
  --color-panel: #1b1f27;
  --color-card: #222732;
  --color-border: #313847;
  --color-text: #e3e7ef;
  --color-muted: #8f98aa;
  --color-accent: #8c82ff;
  --color-accent-soft: rgb(140 130 255 / 0.16);
  --color-accent-text: #0d1117;
  --color-danger: #e5675e;
  --color-on-axis: #0d1117;
  --color-overlay: rgb(0 0 0 / 0.55);
  --shadow-pop: 0 6px 24px rgb(0 0 0 / 0.5);

  --color-axis-x: #ff6b6b;
  --color-axis-y: #51cf66;
  --color-axis-z: #5c9dff;

  --color-scene-bg: #191c23;
  --color-solid: #6d7a92;
  --color-edge: #d6dbe5;
  --color-curve-soft: #b1a8ff;
  --color-edge-hover: #ffc04d;
  --color-edge-selected: #ff8a3d;
  --color-node: #1b1f27;
  --color-junction: #d6dbe5;
  --color-node-outline: #d6dbe5;
  --color-anchor-active: #ff8a3d;
  --color-connect: #f06595;
  --color-handle: #ff8a3d;
  --color-handle-line: #ff8a3d;
  --color-plane: #8c82ff;
  --color-select: #a49cff;
  --color-quote: #d6dbe5;

  --color-plane-surface: #2a303c;
  --plane-surface-opacity: 0.55;
  --color-grid-minor: #3a4252;
  --grid-minor-opacity: 0.6;
  --color-grid-major: #566078;
  --grid-major-opacity: 0.9;

  --color-viewcube-face: #2a303c;
  --color-viewcube-edge: #6b7590;
  --color-viewcube-text: #e3e7ef;
  --color-viewcube-hover: #8c82ff;

  --color-tag-bg: rgb(34 39 50 / 0.96);

  --dim-solid-opacity: 0.2;
  --dim-solid-lighten: 0.15;
  --dim-line-opacity: 0.22;
}

/* Senza tema salvato lo script anti-flash segue gia' prefers-color-scheme;
   questo blocco copre il caso in cui lo script non giri. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #15181e;
    --color-panel: #1b1f27;
    --color-card: #222732;
    --color-border: #313847;
    --color-text: #e3e7ef;
    --color-muted: #8f98aa;
    --color-scene-bg: #191c23;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
}

body {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  overflow: hidden;
  background: var(--color-bg);
  color: var(--color-text);
  font: 14px/1.45 var(--font);
}

kbd {
  font: 11px/1 var(--font);
  padding: 2px 5px;
  border: 1px solid var(--color-border);
  border-bottom-width: 2px;
  border-radius: 4px;
  background: var(--color-panel);
  color: var(--color-text);
}

/* --- barra menu ------------------------------------------------------------------- */

.menubar {
  position: relative;
  z-index: 30;
  display: flex;
  align-items: center;
  gap: var(--space-4);
  height: var(--menubar-height);
  padding: 0 var(--space-3);
  background: var(--color-panel);
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}

.app-title {
  margin: 0;
  font-size: 13px;
  font-weight: 700;
}

.title-short { display: none; }

.menus {
  display: flex;
  gap: 2px;
}

.menu { position: relative; }

.menu-button {
  font: inherit;
  font-size: 13px;
  padding: 4px 10px;
  color: var(--color-text);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.menu-button:hover,
.menu-button[aria-expanded="true"] { background: var(--color-accent-soft); }
.menu-button:focus-visible { outline: 2px solid var(--color-accent); outline-offset: -2px; }

.menu-list {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  display: flex;
  flex-direction: column;
  min-width: 240px;
  padding: var(--space-1);
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-pop);
}

.menu-list[hidden] { display: none; }

.menu-item {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-4);
  width: 100%;
  padding: 6px 10px 6px 30px;
  font: inherit;
  font-size: 13px;
  color: var(--color-text);
  text-align: left;
  text-decoration: none;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.menu-item:hover,
.menu-item:focus { background: var(--color-accent-soft); outline: none; }
.menu-item:focus-visible { box-shadow: inset 0 0 0 2px var(--color-accent); }
.menu-item[aria-disabled="true"] { opacity: 0.45; cursor: default; }
.menu-item[aria-disabled="true"]:hover { background: transparent; }

.menu-item[aria-checked="true"]::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 50%;
  width: 5px;
  height: 10px;
  border: solid var(--color-accent);
  border-width: 0 2px 2px 0;
  transform: translateY(-62%) rotate(45deg);
}

.menu-label { flex: 1; }
.menu-key { color: var(--color-muted); font-size: 12px; }

.menu-sep {
  height: 1px;
  margin: var(--space-1) 6px;
  background: var(--color-border);
}

/* --- layout e pannello ------------------------------------------------------------------- */

.layout {
  display: grid;
  grid-template-columns: var(--panel-width) minmax(0, 1fr);
  min-height: 0;
}

.panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  min-height: 0;
  padding: var(--space-4);
  overflow-y: auto;
  background: var(--color-panel);
  border-right: 1px solid var(--color-border);
}

.panel > * { flex-shrink: 0; }
.panel > [hidden] { display: none; }

h2 {
  margin: 0 0 var(--space-2);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.card {
  padding: var(--space-3);
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.card-sub { margin-top: var(--space-4); }

.mode-title {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  overflow-wrap: anywhere;
}

.mode-card .btn { margin-top: var(--space-3); }

.info { margin: 0 0 var(--space-3); }

.label {
  margin: 0 0 var(--space-1);
  font-size: 12px;
  color: var(--color-muted);
}

.hint {
  margin: var(--space-2) 0 0;
  font-size: 12px;
  color: var(--color-muted);
}

.segmented { display: flex; gap: var(--space-2); }
.segmented .btn { flex: 1; padding: 6px 4px; font-size: 13px; }
.segmented + .field, .segmented + .segmented { margin-top: var(--space-3); }

.btn {
  font: inherit;
  color: var(--color-text);
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  cursor: pointer;
}

.btn:hover:not(:disabled) { border-color: var(--color-accent); }
.btn:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 1px; }
.btn-block { width: 100%; }
.btn-small { font-size: 12px; padding: 3px 6px; }

.btn.is-active, .btn[aria-pressed="true"], .btn-primary {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-accent-text);
}

.btn[aria-pressed="true"] kbd, .btn-primary kbd { color: var(--color-text); }

/* preset colorati con l'asse della normale */
.preset-x { --axis: var(--color-axis-x); }
.preset-y { --axis: var(--color-axis-y); }
.preset-z { --axis: var(--color-axis-z); }
.preset { border-bottom: 3px solid var(--axis); }
.preset:hover:not(:disabled) { border-color: var(--axis); }
.preset.is-active {
  background: var(--axis);
  border-color: var(--axis);
  color: var(--color-on-axis);
}

.field {
  display: grid;
  grid-template-columns: 74px 1fr 56px;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-2);
  font-size: 12px;
}

.field label { color: var(--color-muted); }
.field input[type="range"] { width: 100%; accent-color: var(--color-accent); }

.field input[type="number"], .field select {
  width: 100%;
  font: inherit;
  color: var(--color-text);
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 3px 4px;
}

.field-snap {
  grid-template-columns: 74px 1fr;
  margin-top: var(--space-3);
}

.mode-panel { margin-top: var(--space-3); }
.mode-panel[hidden] { display: none; }

.walls { margin: var(--space-2) 0 0; font-size: 13px; }

.axis-x { --axis: var(--color-axis-x); }
.axis-y { --axis: var(--color-axis-y); }
.axis-z { --axis: var(--color-axis-z); }

.axis-tag {
  display: inline-block;
  padding: 1px 6px;
  margin-right: var(--space-1);
  border-radius: var(--radius-sm);
  background: var(--axis);
  color: var(--color-on-axis);
  font-weight: 600;
  font-size: 12px;
}

.status {
  margin: 0;
  padding: var(--space-2) var(--space-3);
  min-height: 2.2em;
  font-size: 13px;
  background: var(--color-card);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius-sm);
}

.status.is-error { border-left-color: var(--color-danger); }

/* --- libreria dei solidi ------------------------------------------------------------------- */

.library {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(72px, 1fr));
  gap: var(--space-2);
}

.lib-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-1);
  font: inherit;
  font-size: 12px;
  color: var(--color-text);
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: grab;
  touch-action: none;
  user-select: none;
}

.lib-item:hover { border-color: var(--color-accent); }
.lib-item:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 1px; }
.is-placing .lib-item { cursor: grabbing; }

.lib-icon {
  width: 30px;
  height: 30px;
  fill: none;
  stroke: var(--color-accent);
  stroke-width: 1.5;
  stroke-linejoin: round;
  stroke-linecap: round;
}

/* --- vista 3D ------------------------------------------------------------------------------- */

.viewport {
  position: relative;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  background: var(--color-scene-bg);
}

.viewport > canvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
}

.viewport.is-hover > canvas { cursor: grab; }
.viewport.is-edit.is-hover > canvas { cursor: pointer; }
.viewport.is-connect > canvas { cursor: crosshair; }
.viewport.is-dragging > canvas { cursor: grabbing; }

/* cubo di orientamento */
.viewcube {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.viewcube-canvas {
  width: var(--viewcube-size);
  height: var(--viewcube-size);
}

.viewcube-canvas canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.viewcube-canvas canvas.is-hover { cursor: pointer; }

.viewcube-actions { display: flex; gap: var(--space-1); }
.viewcube-actions .btn { flex: 1; }

/* ispettore fisso in basso a destra */
.inspector {
  position: absolute;
  right: var(--space-3);
  bottom: var(--space-3);
  z-index: 3;
  width: 230px;
  font-size: 12px;
  background: var(--color-tag-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-pop);
}

.inspector[hidden] { display: none; }

.insp-head {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 6px 6px 6px 10px;
  border-bottom: 1px solid var(--color-border);
}

.insp-titles {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-width: 0;
}

.insp-title, .insp-sub {
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.insp-title { font-size: 13px; }
.insp-sub { font-size: 11px; color: var(--color-muted); }

.insp-toggle {
  position: relative;
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.insp-toggle:hover { border-color: var(--color-border); }
.insp-toggle:focus-visible { outline: 2px solid var(--color-accent); }

.insp-toggle::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 7px;
  height: 7px;
  border: solid var(--color-muted);
  border-width: 0 2px 2px 0;
  transform: translate(-50%, -70%) rotate(45deg);
}

.inspector.is-compact .insp-head { border-bottom: none; }
.inspector.is-compact .insp-body { display: none; }
.inspector.is-compact .insp-toggle::before { transform: translate(-50%, -25%) rotate(-135deg); }

.insp-body {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: 6px var(--space-2) var(--space-2);
}

#insp-groups {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.insp-group {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.insp-group[hidden] { display: none; }

.insp-group-title {
  margin: 0;
  font-size: 10px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.coord {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: 1px 6px 1px 4px;
  background: var(--color-panel);
  border: 1px solid var(--axis, var(--color-border));
  border-left-width: 3px;
  border-radius: var(--radius-sm);
}

.coord-name {
  min-width: 2.2em;
  font-weight: 700;
  color: var(--axis, var(--color-muted));
}

.coord-input, .coord-value {
  flex: 1;
  min-width: 0;
  padding: 1px 3px;
  font: inherit;
  font-variant-numeric: tabular-nums;
  text-align: right;
  color: var(--color-text);
}

.coord-input {
  background: transparent;
  border: 1px solid transparent;
  border-radius: 4px;
  cursor: text;
}

.coord-input:hover { border-color: var(--color-border); }

.coord-input:focus {
  outline: none;
  border-color: var(--color-accent);
  background: var(--color-panel);
}

.unit { color: var(--color-muted); font-size: 11px; }

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

.chip {
  padding: 1px 5px;
  border-radius: 4px;
  background: var(--axis);
  color: var(--color-on-axis);
  font-size: 11px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

/* tooltip che segue il cursore durante i trascinamenti */
.cursor-tip {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 4;
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: 3px 6px;
  font-size: 12px;
  white-space: nowrap;
  pointer-events: none;
  background: var(--color-tag-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  box-shadow: 0 1px 4px rgb(0 0 0 / 0.18);
  transform: translate(var(--x, -9999px), var(--y, -9999px));
}

.cursor-tip[hidden] { display: none; }

.tip-dist {
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

/* --- riquadro Comandi ----------------------------------------------------------------------------- */

.overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  padding: var(--space-4);
  background: var(--color-overlay);
}

.overlay[hidden] { display: none; }

.dialog {
  display: flex;
  flex-direction: column;
  width: min(640px, 100%);
  max-height: calc(100vh - 2 * var(--space-4));
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-pop);
}

.dialog-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.dialog-head h2 {
  margin: 0;
  font-size: 15px;
  letter-spacing: 0;
  text-transform: none;
  color: var(--color-text);
}

.dialog-body {
  padding: var(--space-1) var(--space-4) var(--space-4);
  overflow-y: auto;
}

.dialog-body h3 {
  margin: var(--space-3) 0 6px;
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.dialog-body dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-1) var(--space-3);
  margin: 0;
  font-size: 13px;
}

.dialog-body dt { font-weight: 600; white-space: nowrap; }
.dialog-body dd { margin: 0; color: var(--color-muted); }

/* --- schermi stretti ---------------------------------------------------------------------------------- */

@media (max-width: 760px) {
  :root { --viewcube-size: 84px; }
  .title-full { display: none; }
  .title-short { display: inline; }
  .menubar { gap: var(--space-2); padding: 0 var(--space-2); }
  .menu-button { padding: 4px 7px; }
  .menu-list { min-width: 210px; }
  .menu:last-child .menu-list { left: auto; right: 0; }
  .layout {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: auto minmax(0, 1fr);
  }
  .panel {
    max-height: 40vh;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
  }
  .inspector { width: 200px; right: var(--space-2); bottom: var(--space-2); }
  .dialog-body dl { grid-template-columns: 1fr; }
  .dialog-body dt { white-space: normal; }
}