* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

html, body {
  height: 100%;
}

body {
  display: flex;
  height: 100vh;
  height: 100dvh; /* corretto su mobile con barre indirizzo dinamiche */
  background-color: #1a1a1a;
  color: #ffffff;
  overflow: hidden;
  user-select: none;
  padding-top: env(safe-area-inset-top, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
}

/* Topbar mobile: nascosta di default (solo desktop) */
#mobile-topbar {
  display: none;
}

#sidebar-overlay {
  display: none;
}

/* Sidebar */
#sidebar {
  width: 250px;
  min-width: 250px;
  background-color: #121212;
  border-right: 1px solid #282828;
  display: flex;
  flex-direction: column;
}

.sidebar-header {
  padding: 20px 16px;
  font-size: 15px;
  font-weight: bold;
  color: #e0e0e0;
  border-bottom: 1px solid #222222;
}

.menu-list {
  list-style: none;
  margin-top: 10px;
}

.menu-item {
  padding: 14px 18px;
  font-size: 13px;
  color: #888888;
  cursor: pointer;
  border-left: 3px solid transparent;
  transition: background 0.15s ease, color 0.15s ease;
}

.menu-item:hover {
  background-color: #1c1c1c;
  color: #ffffff;
}

.menu-item.active {
  background-color: #242424;
  color: #ffffff;
  font-weight: 600;
  border-left: 3px solid #007acc;
}

/* Contenuto Principale */
#main-content {
  flex: 1;
  height: 100%;
  position: relative;
  min-width: 0;
}

.page {
  display: none;
  width: 100%;
  height: 100%;
}

.page.active {
  display: flex;
}

/* Home */
#page-home {
  flex-direction: column;
  padding: 40px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.home-title {
  font-size: 22px;
  font-weight: bold;
  margin-bottom: 8px;
}

.home-sub {
  font-size: 13px;
  color: #777777;
  margin-bottom: 25px;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 16px;
  max-width: 850px;
}

.card-btn {
  background: #222222;
  border: 1px solid #333333;
  border-radius: 5px;
  padding: 20px;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}

.card-btn:hover {
  background: #282828;
  border-color: #007acc;
}

.card-btn h3 {
  font-size: 15px;
  margin-bottom: 8px;
  color: #ffffff;
}

.card-btn p {
  font-size: 12px;
  color: #aaaaaa;
  line-height: 1.4;
}

/* Moduli */
.module-container {
  display: flex;
  width: 100%;
  height: 100%;
}

.panel-controls {
  width: 320px;
  min-width: 300px;
  background-color: #1d1d1d;
  border-right: 1px solid #282828;
  padding: 20px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.mobile-controls-toggle {
  display: none;
}

.controls-inner {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.panel-controls h2 {
  font-size: 14px;
  color: #ffffff;
  border-bottom: 1px solid #333333;
  padding-bottom: 8px;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.control-label {
  font-size: 13px;
  color: #cccccc;
  display: flex;
  justify-content: space-between;
}

.control-label b {
  color: #ffffff;
}

input[type="range"] {
  width: 100%;
  accent-color: #007acc;
  background: #333333;
  height: 5px;
  border-radius: 3px;
  outline: none;
  cursor: pointer;
  touch-action: pan-y;
}

.hint {
  color: #777777;
  font-size: 11px;
}

.checkbox-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.checkbox-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: #cccccc;
  cursor: pointer;
}

.checkbox-item input {
  accent-color: #007acc;
  cursor: pointer;
}

.info-box {
  font-size: 12px;
  line-height: 1.45;
  color: #d8d8d8;
  background: #141414;
  padding: 12px;
  border-radius: 4px;
  border: 1px solid #2a2a2a;
}

.info-box b {
  color: #ffffff;
}

/* Viewports */
.viewport-container {
  flex: 1;
  height: 100%;
  background-color: #0d0d0d;
  position: relative;
  overflow: hidden;
}

.split-viewport {
  display: flex;
  flex-direction: row;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

.canvas-panel {
  position: relative;
  height: 100%;
  overflow: hidden;
  flex-grow: 0;
  flex-shrink: 0;
}

#cil-panel-left {
  width: calc(60% - 6px);
  min-width: 150px;
}

#cil-panel-right {
  width: calc(40% - 6px);
  min-width: 150px;
}

/* Splitter ben visibile e cliccabile */
.resizer {
  width: 12px;
  height: 100%;
  background-color: #222222;
  cursor: col-resize;
  flex-shrink: 0;
  flex-grow: 0;
  position: relative;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  user-select: none;
  border-left: 1px solid #333;
  border-right: 1px solid #333;
}

.resizer::after {
  content: "";
  width: 2px;
  height: 32px;
  background-color: #777;
  border-radius: 1px;
}

.resizer:hover, .resizer.dragging {
  background-color: #007acc;
  border-color: #339af0;
}

.resizer:hover::after, .resizer.dragging::after {
  background-color: #ffffff;
}

/* Quando si trascina, evitiamo che il canvas mangi gli eventi */
body.dragging-splitter,
body.dragging-splitter * {
  cursor: col-resize !important;
  user-select: none !important;
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none; /* il pinch/zoom e il pan sui canvas li gestiamo noi in JS,
                          altrimenti il browser farebbe uno zoom di pagina invece
                          che aggiornare lo slider */
}

/* =====================================================
   RESPONSIVE / MOBILE (PWA su telefono)
   ===================================================== */
@media (max-width: 820px) {

  #mobile-topbar {
    display: flex;
    align-items: center;
    gap: 14px;
    height: 52px;
    min-height: 52px;
    padding: 0 12px;
    padding-top: env(safe-area-inset-top, 0px);
    background-color: #121212;
    border-bottom: 1px solid #282828;
    position: relative;
    z-index: 40;
  }

  #menu-toggle {
    width: 34px;
    height: 34px;
    background: transparent;
    border: none;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    cursor: pointer;
    padding: 0;
  }

  #menu-toggle span {
    display: block;
    height: 2px;
    width: 22px;
    background: #ffffff;
    border-radius: 2px;
  }

  #mobile-title {
    font-size: 14px;
    font-weight: 600;
    color: #eeeeee;
  }

  body {
    flex-direction: column;
  }

  #main-content {
    flex: 1;
    min-height: 0;
  }

  /* Sidebar diventa un pannello off-canvas sopra il contenuto */
  #sidebar {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    width: 78vw;
    max-width: 300px;
    z-index: 60;
    transform: translateX(-100%);
    transition: transform 0.22s ease;
    padding-top: env(safe-area-inset-top, 0px);
    box-shadow: 2px 0 16px rgba(0,0,0,0.5);
  }

  #sidebar.open {
    transform: translateX(0);
  }

  #sidebar-overlay {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 55;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
  }

  #sidebar-overlay.visible {
    opacity: 1;
    pointer-events: auto;
  }

  /* I moduli si impilano verticalmente: pannello parametri sopra, grafico sotto */
  .module-container {
    flex-direction: column;
  }

  .panel-controls {
    width: 100%;
    min-width: 0;
    max-height: 40vh;
    border-right: none;
    border-bottom: 1px solid #282828;
    padding: 0;
    flex: 0 0 auto;
  }

  .mobile-controls-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 12px 16px;
    background: #1d1d1d;
    color: #ffffff;
    border: none;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
  }

  .mobile-controls-toggle .chevron {
    transition: transform 0.2s ease;
  }

  .panel-controls.collapsed .mobile-controls-toggle .chevron {
    transform: rotate(-90deg);
  }

  .controls-inner {
    padding: 16px;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  .panel-controls.collapsed .controls-inner {
    display: none;
  }

  .viewport-container {
    flex: 1;
    min-height: 0;
  }

  /* Il grafico Cilindro: campo di moto sopra, Cp sotto, niente splitter trascinabile */
  .split-viewport {
    flex-direction: column;
  }

  #cil-panel-left,
  #cil-panel-right {
    width: 100% !important;
    height: 50%;
    min-width: 0;
  }

  .resizer {
    display: none;
  }

  .cards-grid {
    grid-template-columns: 1fr;
  }

  #page-home {
    padding: 20px;
  }
}