:root {
  color-scheme: light;
  --win-bg: #008080;
  --win-face: #c0c0c0;
  --win-face-light: #dfdfdf;
  --win-text: #000000;
  --win-title: #000080;
  --win-title-text: #ffffff;
  --win-highlight: #ffffff;
  --win-shadow: #808080;
  --win-dark-shadow: #000000;
  
  --border-outset: 
    inset 1px 1px var(--win-highlight),
    inset -1px -1px var(--win-dark-shadow),
    inset 2px 2px var(--win-face-light),
    inset -2px -2px var(--win-shadow);
    
  --border-inset: 
    inset 1px 1px var(--win-shadow),
    inset -1px -1px var(--win-highlight),
    inset 2px 2px var(--win-dark-shadow),
    inset -2px -2px var(--win-face-light);
    
  --border-window:
    inset 1px 1px var(--win-highlight),
    inset -1px -1px var(--win-dark-shadow),
    inset 2px 2px var(--win-face-light),
    inset -2px -2px var(--win-shadow),
    0 0 0 1px var(--win-dark-shadow);
}

* {
  box-sizing: border-box;
}

html, body {
  min-height: 100%;
}

body {
  margin: 0;
  overflow-x: hidden;
  background: var(--win-bg);
  color: var(--win-text);
  font-family: "MS Sans Serif", "Microsoft Sans Serif", Tahoma, sans-serif;
  -webkit-font-smoothing: none;
  font-smooth: never;
}

button, input, select {
  font: inherit;
  color: var(--win-text);
}

button {
  border: 0;
  cursor: pointer;
  background: var(--win-face);
  box-shadow: var(--border-outset);
  padding: 4px 8px;
}

button:active, button.active {
  box-shadow: var(--border-inset);
  padding: 5px 7px 3px 9px; /* Desplaza el contenido al hundirse */
}

button:focus-visible, input:focus-visible, select:focus-visible, canvas:focus-visible {
  outline: 1px dotted var(--win-text);
  outline-offset: -4px;
}

/* Escritorio */
.desktop {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

/* Ventanas Clásicas */
.win-window {
  background: var(--win-face);
  box-shadow: var(--border-window);
  padding: 2px;
  display: flex;
  flex-direction: column;
}

.app-shell {
  width: 100%;
  max-width: 1024px;
  height: calc(100vh - 32px);
}

:fullscreen .desktop {
  padding: 0;
  background: #000000;
}

:fullscreen .app-shell {
  max-width: none;
  height: 100vh;
  border-radius: 0;
}

.win-titlebar {
  background: var(--win-title);
  color: var(--win-title-text);
  padding: 2px 2px 2px 4px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: bold;
  font-size: 14px;
  height: 24px;
}

.win-title {
  display: flex;
  align-items: center;
  gap: 6px;
}

.win-icon {
  width: 14px;
  height: 14px;
  background: var(--win-face);
  box-shadow: var(--border-outset);
  display: inline-block;
}

.win-controls {
  display: flex;
  gap: 2px;
}

.win-btn {
  width: 20px;
  height: 20px;
  font-weight: bold;
  font-size: 12px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

.win-btn:active {
  padding: 1px 0 0 1px;
}

/* Menubar */
.win-menubar {
  display: flex;
  padding: 2px;
  border-bottom: 1px solid var(--win-shadow);
  margin-bottom: 2px;
}

.menu-btn {
  background: var(--win-face);
  box-shadow: var(--border-outset);
  padding: 4px 12px;
  font-weight: bold;
  margin-right: 2px;
}

.menu-btn:hover {
  /* En win3.1 el hover no cambia el color de los botones normales */
}

.menu-btn:active {
  padding: 5px 11px 3px 13px; /* Hundir al hacer click */
  box-shadow: var(--border-inset);
  background: var(--win-face);
  color: var(--win-text);
}

.win-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 4px;
  gap: 4px;
  min-height: 0;
}

/* Tool Buttons */
.project-stage {
  flex: 1;
  display: flex;
  min-height: 0;
}

.workspace {
  display: flex;
  width: 100%;
  gap: 4px;
  align-items: stretch;
}

/* Toolbar */
.toolbar {
  width: 48px;
  padding: 4px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  background: var(--win-face);
  box-shadow: var(--border-outset);
}

.tool-button {
  width: 100%;
  aspect-ratio: 1;
  font-size: 18px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tool-button.active {
  background: var(--win-face-light);
  /* En win3.1 un botón activo de toolbar tiene textura de dither o queda hundido */
}

.toolbar-separator {
  height: 2px;
  background: var(--win-shadow);
  border-bottom: 1px solid var(--win-highlight);
  margin: 4px 2px;
}

/* Canvas Area */
.canvas-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.canvas-container {
  flex: 1;
  background: #000000;
  box-shadow: var(--border-inset);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 2px;
}

#stage {
  width: 100%;
  height: 100%;
  cursor: crosshair;
  background: #000000;
}

/* Palette */
.palette-strip {
  padding: 4px;
  background: var(--win-face);
  box-shadow: var(--border-outset);
}

.palette {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 4px;
}

.swatch-button {
  height: 36px;
  box-shadow: var(--border-inset);
  border: 1px solid var(--win-dark-shadow);
  padding: 0;
  position: relative;
}

.swatch-button.active {
  box-shadow: 
    inset 2px 2px #000, 
    inset -2px -2px #000,
    inset 3px 3px #fff,
    inset -3px -3px #fff;
  padding: 0;
}

/* Status Bar */
.win-statusbar {
  display: flex;
  margin-top: 2px;
  box-shadow: var(--border-inset);
  padding: 2px;
  gap: 4px;
  font-size: 12px;
}

.status-panel {
  box-shadow: var(--border-inset);
  padding: 2px 6px;
  flex: 1;
}

/* Drawers & Dialogs */
.settings-drawer {
  position: absolute;
  top: 50px;
  right: 24px;
  width: 320px;
  max-height: calc(100vh - 100px);
  z-index: 50;
  display: none;
}

.settings-drawer.open {
  display: flex;
}

.drawer-body {
  overflow-y: auto;
  padding: 8px;
}

fieldset.config-section {
  border: 1px solid var(--win-shadow);
  border-radius: 0;
  padding: 8px;
  margin: 0 0 8px 0;
  box-shadow: 1px 1px var(--win-highlight);
}

legend {
  padding: 0 4px;
}

.control-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 4px;
}

.field-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 4px;
}

.field-grid label {
  display: flex;
  flex-direction: column;
}

input[type="range"] {
  width: 100%;
  margin-bottom: 8px;
}

.win-input {
  box-shadow: var(--border-inset);
  border: 0;
  padding: 2px 4px;
  background: #ffffff;
}

.wide-button {
  width: 100%;
}

.config-note {
  font-size: 11px;
  margin-top: 8px;
}

.info-panel {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 400px;
  z-index: 60;
  display: none;
}

.info-panel.open {
  display: flex;
}

.info-card {
  padding: 16px;
  background: var(--win-face);
}

.info-card p {
  margin: 0 0 12px 0;
}

.backdrop {
  display: none;
}

@media (max-width: 600px) {
  .desktop {
    padding: 0;
  }
  .app-shell {
    height: 100vh;
  }
  .workspace {
    flex-direction: column;
  }
  .toolbar {
    width: 100%;
    flex-direction: row;
    height: auto;
    overflow-x: auto;
  }
  .tool-button {
    width: 44px;
    height: 44px;
    flex-shrink: 0;
  }
  .win-menubar {
    flex-wrap: wrap;
    gap: 4px;
    padding: 4px;
  }
  .menu-btn {
    flex: 1 1 auto;
    font-size: 12px;
    padding: 4px 6px;
  }
  .settings-drawer {
    right: 0;
    top: 24px;
    width: 100%;
    max-height: calc(100vh - 24px);
  }
  .info-panel {
    width: 95%;
  }
  .win-titlebar {
    font-size: 12px;
  }
  .palette {
    gap: 2px;
  }
}

.swatch-button span {
  position: absolute;
  right: 2px;
  bottom: 2px;
  background: var(--win-face);
  color: var(--win-text);
  font-size: 10px;
  font-weight: bold;
  padding: 1px 2px;
  border: 1px solid var(--win-dark-shadow);
  box-shadow: 1px 1px var(--win-highlight);
  pointer-events: none;
}

/* Start Screen */
.start-screen {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: #008080;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
}

.start-box {
  width: 320px;
  max-width: 90%;
}