/* ==========================================================================
   layout.css — Estructura principal de la aplicación.

   ┌──────────────────── topbar ────────────────────┐
   │ toolbar │        workspace          │ sidebar  │
   │         │  (barra · vista · estado) │ (paneles)│
   └─────────┴───────────────────────────┴──────────┘
   ========================================================================== */

.app {
  display: grid;
  height: 100%; /* html y body miden 100 %: se adapta también a barras del sistema */
  grid-template-columns: var(--toolbar-w) minmax(0, 1fr) var(--sidebar-w);
  grid-template-rows: var(--topbar-h) minmax(0, 1fr);
  grid-template-areas:
    "top top top"
    "tools work side";
}

/* ------------------------------ Encabezado ------------------------------ */
.topbar {
  grid-area: top;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 0 var(--space-3);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  min-width: 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-width: 0;
  margin-right: auto;
}

.brand__logo {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  border-radius: 6px;
  /* Carita pixelada hecha solo con CSS */
  background:
    linear-gradient(#fff, #fff) 6px 10px / 5px 4px no-repeat,
    linear-gradient(#fff, #fff) 17px 10px / 5px 4px no-repeat,
    linear-gradient(#143b38, #143b38) 9px 18px / 10px 3px no-repeat,
    linear-gradient(var(--accent), var(--accent));
  box-shadow: inset 0 -4px 0 rgba(0, 0, 0, 0.18);
}

.brand__title {
  font-size: var(--text-lg);
  font-weight: 700;
  letter-spacing: -0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topbar__file,
.topbar__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* ------------------------- Barra de herramientas ------------------------ */
.toolbar {
  grid-area: tools;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-2);
  background: var(--surface);
  border-right: 1px solid var(--border);
  overflow-y: auto;
}

.toolbar__group {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--border);
}

.toolbar__group:last-child {
  border-bottom: 0;
}

/* ---------------------------- Área de trabajo --------------------------- */
.workspace {
  grid-area: work;
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
}

.workspace__bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.tool-options {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-4);
  margin-left: auto;
}

.viewport {
  position: relative;
  flex: 1;
  min-height: 0;
  background: var(--viewport-bg);
  overflow: hidden;
}

.viewport__canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  touch-action: none; /* los gestos táctiles los maneja el editor */
  cursor: crosshair;
}

.viewport__canvas.is-grabbing {
  cursor: grabbing;
}

.workspace[data-tool="picker"] .viewport__canvas {
  cursor: copy;
}

.viewport__overlay {
  position: absolute;
  display: flex;
  gap: var(--space-1);
  pointer-events: none;
}

.viewport__overlay > * {
  pointer-events: auto;
}

.viewport__views {
  top: var(--space-3);
  left: var(--space-3);
  flex-wrap: wrap;
  max-width: calc(100% - 80px);
}

.viewport__zoom {
  right: var(--space-3);
  top: var(--space-3);
  flex-direction: column;
}

.viewport__hint {
  position: absolute;
  left: 50%;
  bottom: var(--space-3);
  transform: translateX(-50%);
  max-width: calc(100% - 24px);
  padding: 4px 10px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--surface) 85%, transparent);
  color: var(--text-muted);
  font-size: var(--text-xs);
  text-align: center;
  pointer-events: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.statusbar {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  height: var(--statusbar-h);
  padding: 0 var(--space-3);
  background: var(--surface);
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: var(--text-xs);
  white-space: nowrap;
  overflow: hidden;
}

.statusbar__spacer {
  flex: 1;
}

.statusbar__save::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-right: 6px;
  border-radius: 50%;
  background: var(--success);
  vertical-align: 1px;
}

.statusbar__save:empty {
  display: none;
}

.statusbar__save.is-off::before {
  background: var(--warning);
}

/* ------------------------------ Panel lateral --------------------------- */
/* El borde arrastrable comparte el área "side" y se alinea a su izquierda. */
.sidebar-resizer {
  grid-area: side;
  justify-self: start;
  position: relative;
  z-index: 6;
  width: 10px;
  height: 100%;
  margin-left: -5px;
  cursor: col-resize;
  touch-action: none;
}

.sidebar-resizer::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 4px;
  width: 2px;
  background: transparent;
  transition: background var(--transition);
}

.sidebar-resizer:hover::after,
.sidebar-resizer:focus-visible::after,
.is-resizing-sidebar .sidebar-resizer::after {
  background: var(--accent);
}

.sidebar-resizer:focus-visible {
  outline: none;
}

/* Mientras se arrastra: sin selección de texto y cursor fijo en toda la página. */
.is-resizing-sidebar,
.is-resizing-sidebar * {
  cursor: col-resize !important;
  user-select: none;
}

.sidebar {
  grid-area: side;
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border-left: 1px solid var(--border);
  overflow-y: auto;
  overscroll-behavior: contain;
}

/* ------------------------------- Responsivo ----------------------------- */
@media (max-width: 1100px) {
  .brand__title span {
    font-size: var(--text-md);
  }
}

@media (max-width: 880px) {
  body {
    overflow: auto;
  }

  .app {
    height: auto;
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: auto auto auto auto;
    grid-template-areas:
      "top"
      "tools"
      "work"
      "side";
  }

  .topbar {
    flex-wrap: wrap;
    padding: var(--space-2) var(--space-3);
  }

  .brand {
    flex: 1 1 0;
  }

  .topbar__actions {
    order: 2;
  }

  .topbar__file {
    order: 3;
    flex: 1 1 100%;
    flex-wrap: wrap;
  }

  .filename {
    flex: 1 1 140px;
  }

  .toolbar {
    position: sticky;
    top: 0;
    z-index: 5;
    flex-direction: row;
    overflow-x: auto;
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }

  .toolbar__group {
    flex-direction: row;
    padding: 0 var(--space-2) 0 0;
    border-bottom: 0;
    border-right: 1px solid var(--border);
  }

  #tool-buttons {
    flex-direction: row;
  }

  .workspace {
    height: 72vh;
    min-height: 420px;
  }

  .tool-options {
    margin-left: 0;
  }

  .sidebar {
    border-left: 0;
    border-top: 1px solid var(--border);
    overflow: visible;
  }

  .sidebar-resizer {
    display: none;
  }
}

@media (max-width: 520px) {
  .brand__title {
    font-size: var(--text-md);
  }

  .topbar__actions {
    gap: 2px;
  }

  .viewport__hint {
    display: none;
  }
}

@media (max-width: 520px) {
  .btn--agent {
    width: 36px;
    padding: 0;
  }

  .btn--agent span {
    display: none;
  }
}