/* ==========================================================================
   Paint Studio — application shell layout
   ========================================================================== */

.app {
  display: grid;
  grid-template-rows: var(--h-top) var(--h-options) 1fr var(--h-status);
  height: 100dvh;
  min-height: 0;
  background: var(--bg-0);
  animation: app-in var(--t-slow) both;
}

@keyframes app-in {
  from {
    opacity: 0;
    transform: scale(0.995);
  }
}

/* ------------------------------- top bar --------------------------------- */

.topbar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 10px 0 12px;
  background: var(--bg-1);
  border-bottom: 1px solid var(--stroke);
  box-shadow: var(--sh-1);
  z-index: 30;
  min-width: 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  padding-right: 4px;
  flex: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 9px;
  color: #fff;
  background: linear-gradient(140deg, var(--accent), var(--accent-2));
  box-shadow: 0 2px 10px var(--accent-glow), var(--sh-inset);
}

.brand-mark .icon {
  width: 17px;
  height: 17px;
  stroke-width: 2;
}

.brand-mark.lg {
  width: 52px;
  height: 52px;
  border-radius: 16px;
}

.brand-mark.lg .icon {
  width: 28px;
  height: 28px;
}

.brand-name {
  font-size: 14px;
  font-weight: 650;
  letter-spacing: -0.2px;
  white-space: nowrap;
}

.brand-name em {
  font-style: normal;
  font-weight: 450;
  color: var(--text-2);
}

.menubar {
  display: flex;
  align-items: center;
  gap: 1px;
  flex: 0 1 auto;
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: none;
}

.menubar::-webkit-scrollbar {
  display: none;
}

.topbar-doc {
  display: flex;
  align-items: baseline;
  gap: 8px;
  min-width: 0;
  flex: 1 1 auto;
  justify-content: center;
}

.doc-title {
  max-width: 240px;
  min-width: 60px;
  padding: 4px 8px;
  font-size: 12.5px;
  font-weight: 550;
  text-align: right;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  transition: background var(--t-fast), border-color var(--t-fast);
  field-sizing: content;
}

.doc-title:hover {
  background: var(--bg-2);
}

.doc-title:focus {
  background: var(--bg-2);
  border-color: var(--accent);
  text-align: left;
}

.doc-meta {
  font-size: 11px;
  color: var(--text-3);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: none;
}

/* ----------------------------- options bar ------------------------------- */

.optionsbar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 10px;
  background: linear-gradient(var(--bg-1), var(--bg-1)) padding-box;
  border-bottom: 1px solid var(--stroke);
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  z-index: 20;
  min-width: 0;
}

.optionsbar::-webkit-scrollbar {
  display: none;
}

.opt-title {
  display: flex;
  align-items: center;
  gap: 7px;
  padding-right: 6px;
  font-weight: 600;
  white-space: nowrap;
  flex: none;
}

.opt-title .icon {
  width: 17px;
  height: 17px;
  color: var(--accent);
}

/* ------------------------------ workspace -------------------------------- */

.workspace {
  display: grid;
  grid-template-columns: var(--w-rail) minmax(0, 1fr) var(--w-side);
  min-height: 0;
  min-width: 0;
}

.workspace.side-collapsed {
  grid-template-columns: var(--w-rail) minmax(0, 1fr) 0;
}

.workspace.side-collapsed .sidebar {
  display: none;
}

/* -------------------------------- rail ----------------------------------- */

.rail {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 8px 6px;
  background: var(--bg-1);
  border-right: 1px solid var(--stroke);
  overflow-y: auto;
  overflow-x: hidden;
  z-index: 15;
}

.rail-group {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 4px;
}

.rail-group + .rail-group {
  padding-top: 6px;
  border-top: 1px solid var(--stroke);
}

.rail-label {
  grid-column: 1 / -1;
  font-size: 9.5px;
  font-weight: 700;
  letter-spacing: 0.7px;
  text-transform: uppercase;
  color: var(--text-3);
  padding: 1px 2px 2px;
}

/* -------------------------------- stage ---------------------------------- */

.stage {
  position: relative;
  min-width: 0;
  min-height: 0;
  background: var(--stage);
  overflow: hidden;
  touch-action: none;
}

.view-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

/* holds DOM-based overlays positioned in stage space (text editor, handles) */
.stage-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.stage-hud {
  position: absolute;
  right: 14px;
  bottom: 14px;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
  pointer-events: none;
  z-index: 5;
}

.zoombar {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 4px;
  border-radius: var(--r-full);
  background: var(--glass);
  backdrop-filter: blur(14px) saturate(160%);
  border: 1px solid var(--stroke-2);
  box-shadow: var(--sh-2);
  pointer-events: auto;
}

.zoom-value {
  min-width: 54px;
  padding: 3px 4px;
  font-size: 11.5px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--text);
  border-radius: var(--r-sm);
  transition: background var(--t-fast);
}

.zoom-value:hover {
  background: var(--bg-3);
}

.dropzone {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  z-index: 8;
  background: rgba(10, 11, 15, 0.6);
  backdrop-filter: blur(3px);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--t-med);
}

.dropzone.is-active {
  opacity: 1;
}

.dropzone-card {
  display: grid;
  justify-items: center;
  gap: 6px;
  padding: 34px 52px;
  border-radius: var(--r-xl);
  border: 2px dashed var(--accent);
  background: var(--bg-1);
  box-shadow: var(--sh-3);
  text-align: center;
  transform: scale(0.96);
  transition: transform var(--t-med);
}

.dropzone.is-active .dropzone-card {
  transform: scale(1);
}

.dropzone-card .icon {
  width: 34px;
  height: 34px;
  color: var(--accent);
}

.dropzone-card strong {
  font-size: 15px;
}

.dropzone-card span {
  font-size: 11.5px;
  color: var(--text-3);
}

/* ------------------------------- sidebar --------------------------------- */

.sidebar {
  display: flex;
  flex-direction: column;
  min-height: 0;
  min-width: 0;
  background: var(--bg-1);
  border-left: 1px solid var(--stroke);
  z-index: 15;
}

.panel {
  border-bottom: 1px solid var(--stroke);
  flex: none;
}

.panel-head {
  display: flex;
  align-items: center;
  gap: 6px;
  height: 32px;
  padding: 0 8px 0 12px;
}

.panel-head h2 {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--text-3);
  flex: 1 1 auto;
}

.tabs {
  display: flex;
  gap: 2px;
  padding: 6px 6px 0;
  flex: none;
}

.tab {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  flex: 1 1 0;
  min-width: 0;
  padding: 7px 4px;
  font-size: 11.5px;
  font-weight: 550;
  color: var(--text-2);
  border-radius: var(--r-sm) var(--r-sm) 0 0;
  border-bottom: 2px solid transparent;
  transition: color var(--t-fast), background var(--t-fast),
    border-color var(--t-fast);
}

.tab .icon {
  width: 15px;
  height: 15px;
}

.tab:hover {
  color: var(--text);
  background: var(--bg-2);
}

.tab.is-active {
  color: var(--text);
  border-bottom-color: var(--accent);
  background: var(--bg-2);
}

.tab-panels {
  position: relative;
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  border-top: 1px solid var(--stroke);
}

.tab-panel {
  display: none;
  flex-direction: column;
  min-height: 0;
  width: 100%;
}

.tab-panel.is-active {
  display: flex;
  animation: panel-in var(--t-med) both;
}

@keyframes panel-in {
  from {
    opacity: 0;
    transform: translateY(3px);
  }
}

.panel-hint {
  padding: 8px 12px 12px;
  font-size: 11px;
  line-height: 1.5;
  color: var(--text-3);
  border-top: 1px solid var(--stroke);
}

.panel-actions {
  display: flex;
  gap: 6px;
  padding: 8px 10px;
  border-top: 1px solid var(--stroke);
}

.panel-actions .btn {
  flex: 1 1 0;
  justify-content: center;
}

/* ------------------------------ status bar ------------------------------- */

.statusbar {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 0 12px;
  font-size: 11px;
  color: var(--text-3);
  background: var(--bg-1);
  border-top: 1px solid var(--stroke);
  z-index: 20;
  overflow: hidden;
  white-space: nowrap;
}

.status-item {
  font-variant-numeric: tabular-nums;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.status-item:empty {
  display: none;
}

#statusTool {
  color: var(--text);
  font-weight: 600;
}

/* ------------------------------ responsive ------------------------------- */

@media (max-width: 1180px) {
  :root {
    --w-side: 262px;
  }
}

@media (max-width: 980px) {
  :root {
    --w-rail: 46px;
    --h-top: 46px;
  }

  .rail-group {
    grid-template-columns: 1fr;
  }

  .rail-label {
    display: none;
  }

  .brand-name,
  .topbar-doc {
    display: none;
  }
}

@media (max-width: 760px) {
  .workspace {
    grid-template-columns: var(--w-rail) minmax(0, 1fr);
  }

  .sidebar {
    position: fixed;
    top: calc(var(--h-top) + var(--h-options));
    right: 0;
    bottom: var(--h-status);
    width: min(320px, 88vw);
    box-shadow: var(--sh-3);
    transform: translateX(101%);
    transition: transform var(--t-slow);
    z-index: 40;
  }

  .sidebar.is-open {
    transform: none;
  }

  .statusbar {
    gap: 10px;
  }

  #statusHint {
    display: none;
  }

  /* keep undo/redo and Export reachable: the rest lives in the menus */
  .topbar {
    padding: 0 6px 0 8px;
    gap: 4px;
  }

  #themeBtn,
  #helpBtn,
  .topbar-actions .sep {
    display: none;
  }

  .menu-btn {
    padding: 0 7px;
  }
}

@media (max-width: 520px) {
  .brand {
    display: none;
  }

  .btn-primary#exportBtn span {
    display: none;
  }

  #exportBtn {
    padding: 0 9px;
  }
}