/* Lumen — layout.css : app shell (topbar, workspace, toolbar, canvas area, right panel frame, statusbar, responsive) */
/* ============ APP LAYOUT ============ */
.app {
  display: grid;
  grid-template-rows: 56px 1fr 30px;
  height: 100vh;
  background: var(--bg-grad);
}
/* ============ TOPBAR ============ */
.topbar {
  display: flex;
  align-items: center;
  padding: 0 14px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  gap: 6px;
  z-index: 30;
  position: relative;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-right: 14px;
  margin-right: 6px;
  border-right: 1px solid var(--border);
  height: 36px;
}
.brand-logo {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), #ff9a35);
  display: grid;
  place-items: center;
  box-shadow: 0 4px 14px var(--accent-glow);
  position: relative;
  overflow: hidden;
}
.brand-logo::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.5), transparent 50%);
}
.brand-logo svg {
  width: 18px;
  height: 18px;
  color: #fff;
  position: relative;
  z-index: 1;
}
.brand-name {
  font-family: 'Bricolage Grotesque', sans-serif;
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -0.02em;
}
.brand-name span {
  color: var(--accent);
}
.tb-group {
  display: flex;
  gap: 2px;
  padding: 0 6px;
  position: relative;
}
.tb-group + .tb-group::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 1px;
  height: 22px;
  background: var(--border);
}
.tb-btn {
  height: 34px;
  padding: 0 10px;
  border-radius: 7px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-muted);
  font-weight: 500;
  font-size: 12.5px;
  transition: all 0.15s;
  white-space: nowrap;
}
.tb-btn:hover {
  background: var(--panel-2);
  color: var(--text);
}
.tb-btn:active {
  transform: scale(0.96);
}
.tb-btn svg {
  width: 16px;
  height: 16px;
}
.tb-btn.primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 14px -2px var(--accent-glow);
}
.tb-btn.primary:hover {
  background: var(--accent-hover);
}
.tb-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
.tb-btn.icon-only {
  padding: 0;
  width: 34px;
  justify-content: center;
}
.tb-spacer {
  flex: 1;
}
.zoom-control {
  display: flex;
  align-items: center;
  background: var(--panel-2);
  border-radius: 8px;
  padding: 2px;
  gap: 1px;
}
.zoom-control button {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  display: grid;
  place-items: center;
  color: var(--text-muted);
}
.zoom-control button:hover {
  background: var(--panel-3);
  color: var(--text);
}
.zoom-control button svg {
  width: 14px;
  height: 14px;
}
.zoom-value {
  min-width: 52px;
  text-align: center;
  font-size: 12px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--text);
}
.theme-toggle {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  color: var(--text-muted);
  transition: all 0.2s;
}
.theme-toggle:hover {
  background: var(--panel-2);
  color: var(--text);
}
.theme-toggle svg {
  width: 17px;
  height: 17px;
}
/* ============ WORKSPACE ============ */
.workspace {
  display: grid;
  grid-template-columns: 68px 1fr 320px;
  overflow: hidden;
  min-height: 0;
}
/* ============ LEFT TOOLBAR ============ */
.left-toolbar {
  background: var(--panel);
  border-right: 1px solid var(--border);
  padding: 10px 8px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  scrollbar-width: thin;
}
.left-toolbar::-webkit-scrollbar {
  width: 0;
}
.tool-btn {
  width: 52px;
  height: 52px;
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  color: var(--text-muted);
  position: relative;
  transition: all 0.18s ease;
  margin: 0 auto;
}
.tool-btn svg {
  width: 19px;
  height: 19px;
  transition: transform 0.2s;
}
.tool-btn .tool-label {
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  opacity: 0.85;
}
.tool-btn:hover {
  background: var(--panel-2);
  color: var(--text);
}
.tool-btn:hover svg {
  transform: scale(1.08);
}
.tool-btn.active {
  background: var(--accent-soft);
  color: var(--accent);
}
.tool-btn.active::before {
  content: '';
  position: absolute;
  left: -8px;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 22px;
  background: var(--accent);
  border-radius: 0 3px 3px 0;
}
.tool-btn .badge {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}
/* Tooltip */
.tool-btn[data-tip]::after {
  content: attr(data-tip);
  position: absolute;
  left: calc(100% + 12px);
  top: 50%;
  transform: translateY(-50%) translateX(-6px);
  background: var(--panel-3);
  color: var(--text);
  padding: 5px 10px;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 500;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: all 0.18s;
  z-index: 100;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-md);
}
.tool-btn[data-tip]:hover::after {
  opacity: 1;
  transform: translateY(-50%) translateX(0);
}
/* ============ CANVAS AREA ============ */
.canvas-area {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(45deg, rgba(255, 255, 255, 0.012) 25%, transparent 25%, transparent 75%, rgba(255, 255, 255, 0.012) 75%),
    linear-gradient(45deg, rgba(255, 255, 255, 0.012) 25%, transparent 25%, transparent 75%, rgba(255, 255, 255, 0.012) 75%),
    var(--bg);
  background-size: 24px 24px;
  background-position: 0 0, 12px 12px;
}
[data-theme="light"] .canvas-area {
  background:
    linear-gradient(45deg, rgba(0, 0, 0, 0.025) 25%, transparent 25%, transparent 75%, rgba(0, 0, 0, 0.025) 75%),
    linear-gradient(45deg, rgba(0, 0, 0, 0.025) 25%, transparent 25%, transparent 75%, rgba(0, 0, 0, 0.025) 75%),
    var(--bg);
  background-size: 24px 24px;
  background-position: 0 0, 12px 12px;
}
.canvas-wrap {
  position: absolute;
  inset: 0;
  overflow: hidden;
}
/*
 * Centered via left/top 50% + translate(-50%,-50%) rather than grid
 * place-items:center — grid centering miscomputes when the item's
 * pre-transform layout box (e.g. a tall portrait image before its
 * fit-to-screen scale is applied) is much larger than the container,
 * pushing it off-center instead of centering the scaled-down result.
 * The JS-driven pan/zoom transform (Engine.applyZoom) builds on top of
 * this base position, see js/core/engine.js.
 */
.canvas-stage {
  position: absolute;
  left: 50%;
  top: 50%;
  transform-origin: center;
  transition: transform 0.08s ease-out;
  box-shadow: 0 20px 60px -10px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(255, 255, 255, 0.04);
  background: #fff;
  border-radius: 2px;
}
.canvas-stage canvas {
  display: block;
  position: absolute;
  top: 0;
  left: 0;
}
.canvas-stage #overlayCanvas {
  z-index: 2;
}
.canvas-stage #gridCanvas {
  z-index: 3;
  pointer-events: none;
}

/* Rulers (view-only aids — never part of the exported image) */
.ruler {
  position: absolute;
  background: var(--panel);
  z-index: 20;
  display: none;
}
/*
 * width/height use calc() rather than left+right/top+bottom because
 * <canvas> is a CSS "replaced element" — absolutely-positioned replaced
 * elements size to their intrinsic dimensions, not by stretching between
 * opposite offsets the way a <div> would, so left:20px;right:0 alone
 * silently collapses the canvas to its tiny default 300x150 intrinsic box.
 */
.ruler-h { top: 0; left: 20px; width: calc(100% - 20px); height: 20px; border-bottom: 1px solid var(--border); }
.ruler-v { top: 20px; left: 0; width: 20px; height: calc(100% - 20px); border-right: 1px solid var(--border); }
.ruler-corner {
  position: absolute;
  top: 0; left: 0;
  width: 20px; height: 20px;
  background: var(--panel);
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  z-index: 21;
  display: none;
}
.show-rulers .ruler, .show-rulers .ruler-corner { display: block; }
/* Empty state */
.empty-state {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 18px;
  text-align: center;
  padding: 24px;
}
.empty-state.hidden {
  display: none;
}
.empty-illustration {
  width: 130px;
  height: 130px;
  border-radius: 28px;
  background: linear-gradient(135deg, var(--accent-soft), var(--teal-soft));
  border: 1.5px dashed var(--border-strong);
  display: grid;
  place-items: center;
  position: relative;
  animation: float 4s ease-in-out infinite;
}
.empty-illustration svg {
  width: 54px;
  height: 54px;
  color: var(--accent);
}
@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-8px);
  }
}
.empty-state h2 {
  font-family: 'Bricolage Grotesque', sans-serif;
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.empty-state p {
  color: var(--text-muted);
  max-width: 420px;
  line-height: 1.55;
  font-size: 13.5px;
}
.empty-actions {
  display: flex;
  gap: 10px;
  margin-top: 6px;
  flex-wrap: wrap;
  justify-content: center;
}
.empty-actions button {
  padding: 10px 18px;
  border-radius: 9px;
  font-weight: 600;
  font-size: 13px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s;
}
.empty-actions button.primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 8px 22px -6px var(--accent-glow);
}
.empty-actions button.primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}
.empty-actions button.secondary {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
}
.empty-actions button.secondary:hover {
  background: var(--panel-3);
}
.empty-actions button svg {
  width: 15px;
  height: 15px;
}
.empty-hint {
  margin-top: 16px;
  font-size: 11.5px;
  color: var(--text-dim);
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  justify-content: center;
}
.empty-hint kbd {
  background: var(--panel-2);
  border: 1px solid var(--border);
  padding: 2px 7px;
  border-radius: 5px;
  font-family: 'Manrope', sans-serif;
  font-weight: 600;
  font-size: 10.5px;
  margin: 0 2px;
}
/* Drop overlay */
.drop-overlay {
  position: absolute;
  inset: 0;
  background: var(--accent-soft);
  backdrop-filter: blur(4px);
  border: 2.5px dashed var(--accent);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 50;
  pointer-events: none;
}
.drop-overlay.active {
  display: flex;
}
.drop-overlay .drop-inner {
  background: var(--panel);
  padding: 30px 50px;
  border-radius: 16px;
  text-align: center;
  box-shadow: var(--shadow-lg);
}
.drop-overlay svg {
  width: 56px;
  height: 56px;
  color: var(--accent);
  margin-bottom: 12px;
}
.drop-overlay h3 {
  font-size: 18px;
  font-family: 'Bricolage Grotesque', sans-serif;
}
.drop-overlay p {
  color: var(--text-muted);
  margin-top: 4px;
  font-size: 12.5px;
}
/* Floating canvas controls */
.canvas-controls {
  position: absolute;
  bottom: 14px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 4px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 4px;
  box-shadow: var(--shadow-md);
  z-index: 10;
}
.canvas-controls button {
  width: 30px;
  height: 30px;
  border-radius: 7px;
  display: grid;
  place-items: center;
  color: var(--text-muted);
  transition: all 0.15s;
}
.canvas-controls button:hover {
  background: var(--panel-2);
  color: var(--text);
}
.canvas-controls button svg {
  width: 14px;
  height: 14px;
}
.canvas-controls button.active {
  background: var(--accent-soft);
  color: var(--accent);
}
/* Navigator */
.navigator {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 160px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px;
  box-shadow: var(--shadow-md);
  z-index: 10;
}
.navigator.hidden {
  display: none;
}
.navigator-title {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 6px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.navigator-title button {
  width: 16px;
  height: 16px;
  display: grid;
  place-items: center;
  color: var(--text-dim);
}
.navigator-canvas {
  width: 100%;
  aspect-ratio: 1;
  background: #fff;
  border-radius: 5px;
  position: relative;
  overflow: hidden;
}
.navigator-canvas canvas {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.navigator-canvas .nav-rect {
  position: absolute;
  border: 1.5px solid var(--accent);
  background: var(--accent-soft);
  pointer-events: none;
}
/* ============ RIGHT PANEL ============ */
.right-panel {
  background: var(--panel);
  border-left: 1px solid var(--border);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}
.right-panel::-webkit-scrollbar {
  width: 6px;
}
.right-panel::-webkit-scrollbar-track {
  background: transparent;
}
.right-panel::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 3px;
}
.panel-header {
  padding: 16px 18px 12px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--panel);
  z-index: 5;
}
.panel-title {
  font-family: 'Bricolage Grotesque', sans-serif;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 8px;
}
.panel-title svg {
  width: 17px;
  height: 17px;
  color: var(--accent);
}
.panel-subtitle {
  font-size: 11.5px;
  color: var(--text-muted);
  margin-top: 3px;
}
.panel-section {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
}
.panel-section:last-child {
  border-bottom: none;
}
.section-label {
  font-size: 10.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.section-label .reset-link {
  color: var(--text-dim);
  font-size: 10px;
  text-transform: none;
  letter-spacing: 0;
  font-weight: 600;
}
.section-label .reset-link:hover {
  color: var(--accent);
}
/* Status bar */
.statusbar {
  background: var(--panel);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 14px;
  font-size: 11px;
  color: var(--text-muted);
  gap: 18px;
  font-variant-numeric: tabular-nums;
}
.status-item {
  display: flex;
  align-items: center;
  gap: 5px;
}
.status-item svg {
  width: 11px;
  height: 11px;
}
.status-item strong {
  color: var(--text);
  font-weight: 600;
}
.status-spacer {
  flex: 1;
}
.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 6px var(--success);
}
/* Responsive */
@media (max-width: 1024px) {
  .workspace {
    grid-template-columns: 60px 1fr 280px;
  }
  .right-panel {
    width: 280px;
  }
}
@media (max-width: 768px) {
  .app {
    grid-template-rows: 52px 1fr 50px 30px;
  }
  .workspace {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr;
  }
  .left-toolbar {
    display: none;
  }
  .mobile-toolbar {
    display: flex;
    position: fixed;
    bottom: 30px;
    left: 0;
    right: 0;
    background: var(--panel);
    border-top: 1px solid var(--border);
    padding: 6px 8px;
    gap: 2px;
    overflow-x: auto;
    z-index: 30;
  }
  .mobile-toolbar .tool-btn {
    width: 48px;
    height: 42px;
    flex-shrink: 0;
  }
  .mobile-toolbar .tool-btn .tool-label {
    font-size: 8.5px;
  }
  .right-panel {
    position: fixed;
    bottom: 80px;
    left: 0;
    right: 0;
    width: auto;
    max-height: 50vh;
    border-left: none;
    border-top: 1px solid var(--border);
    border-radius: 14px 14px 0 0;
    transform: translateY(100%);
    transition: transform 0.3s;
    z-index: 25;
  }
  .right-panel.open {
    transform: translateY(0);
  }
  .navigator {
    width: 110px;
    top: 8px;
    right: 8px;
  }
  .topbar {
    padding: 0 10px;
    gap: 2px;
  }
  .brand {
    padding-right: 8px;
    margin-right: 2px;
  }
  .brand-name {
    display: none;
  }
  .tb-btn span {
    display: none;
  }
  .tb-btn {
    padding: 0;
    width: 34px;
    justify-content: center;
  }
  .tb-btn.primary span {
    display: inline;
  }
  .tb-btn.primary {
    padding: 0 10px;
  }
  .zoom-control {
    padding: 1px;
  }
  .zoom-control button {
    width: 26px;
    height: 26px;
  }
  .zoom-value {
    min-width: 42px;
    font-size: 11px;
  }
}
.mobile-toolbar {
  display: none;
}
@media (max-width: 768px) {
  .mobile-toolbar {
    display: flex;
  }
}
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}