/* ==========================================================================
   layout.css — App Shell Grid Layout (Figma-style design tool)
   Business Card Generator
   ========================================================================== */

/* ---------- App Shell — 3-column, 2-row grid ----------
   ┌─────────────────────────────────────────────────┐
   │                  toolbar-top                     │
   ├──────┬──────────────────────────┬────────────────┤
   │ left │                          │   panel-right  │
   │ tool │      canvas-area         │   (layers /    │
   │ bar  │                          │   properties)  │
   ├──────┴──────────────────────────┴────────────────┤
   │                  status-bar                      │
   └─────────────────────────────────────────────────┘
*/

.app-shell {
  display: grid;
  grid-template-columns: 48px 1fr 280px;
  grid-template-rows: 40px 1fr 24px;
  grid-template-areas:
    "toolbar-top   toolbar-top   toolbar-top"
    "toolbar-left  canvas-area   panel-right"
    "status-bar    status-bar    status-bar";
  height: 100vh;
  width: 100vw;
  overflow: hidden;
}

/* ---------- Top Toolbar ---------- */

.toolbar-top {
  grid-area: toolbar-top;
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: var(--space-xs);
  padding: 0 var(--space-sm);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 10;
  user-select: none;
}

.toolbar-top__group {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

/* Divider between button groups */
.toolbar-top__divider {
  width: 1px;
  height: 20px;
  background: var(--border-subtle);
  margin: 0 var(--space-xs);
  flex-shrink: 0;
}

.toolbar-top__spacer {
  flex: 1;
}

.toolbar-top__title {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  letter-spacing: 0.5px;
  text-transform: uppercase;
  margin-right: var(--space-md);
}

/* Top toolbar buttons */
.toolbar-top__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  height: 28px;
  padding: 0 var(--space-sm);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-family: var(--font-ui);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition:
    background var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast);
  white-space: nowrap;
}

.toolbar-top__btn:hover {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border-color: var(--border-subtle);
}

.toolbar-top__btn:active {
  background: var(--bg-panel);
}

.toolbar-top__btn--accent {
  color: var(--accent-cyan);
}

.toolbar-top__btn--accent:hover {
  color: var(--accent-cyan);
  box-shadow: var(--glow-cyan);
  border-color: rgba(0, 240, 255, 0.2);
}

.toolbar-top__btn--accent[aria-pressed="true"] {
  background: rgba(0, 240, 255, 0.15);
  border-color: var(--accent-cyan);
  box-shadow: var(--glow-cyan);
}

/* JPG quality slider */
.toolbar-top__quality-group {
  align-items: center;
  gap: 6px;
}

.toolbar-top__quality-label {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  white-space: nowrap;
}

.toolbar-top__quality-slider {
  width: 64px;
  height: 4px;
  accent-color: var(--accent-cyan);
  cursor: pointer;
}

/* Zoom display */
.toolbar-top__zoom {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  min-width: 48px;
  text-align: center;
}

/* ---------- Left Toolbar (Vertical Icon Bar) ---------- */

.toolbar-left {
  grid-area: toolbar-left;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: var(--space-xs) 0;
  background: var(--bg-surface);
  border-right: 1px solid var(--border-subtle);
  z-index: 10;
  user-select: none;
}

.toolbar-left__btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 16px;
  transition:
    background var(--transition-fast),
    color var(--transition-fast);
  position: relative;
}

.toolbar-left__btn:hover {
  background: var(--bg-elevated);
  color: var(--text-primary);
}

.toolbar-left__btn--active {
  background: var(--bg-elevated);
  color: var(--accent-cyan);
}

.toolbar-left__btn--active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--accent-cyan);
  border-radius: 0 1px 1px 0;
  box-shadow: 0 0 6px rgba(0, 240, 255, 0.5);
}

.toolbar-left__divider {
  width: 24px;
  height: 1px;
  background: var(--border-subtle);
  margin: var(--space-xs) 0;
}

/* Tooltip for tool buttons */
.toolbar-left__btn[title] {
  position: relative;
}

/* ---------- Canvas Area ---------- */

.canvas-area {
  grid-area: canvas-area;
  position: relative;
  overflow: hidden;
  background: var(--bg-deep);
}

/* ---------- Right Panel ---------- */

.panel-right {
  grid-area: panel-right;
  display: flex;
  flex-direction: column;
  background: var(--bg-panel);
  border-left: 1px solid var(--border-subtle);
  overflow-y: auto;
  overflow-x: hidden;
  z-index: 10;
  user-select: none;
}

.panel-right__section {
  display: flex;
  flex-direction: column;
  border-bottom: 1px solid var(--border-subtle);
}

.panel-right__section:last-child {
  border-bottom: none;
}

.panel-right__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-sm);
  cursor: pointer;
  user-select: none;
  transition: background var(--transition-fast);
}

.panel-right__header:hover {
  background: rgba(255, 255, 255, 0.02);
}

.panel-right__header-title {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  font-weight: 600;
}

.panel-right__header-chevron {
  color: var(--text-muted);
  font-size: 10px;
  transition: transform var(--transition-fast);
}

.panel-right__section--collapsed
  .panel-right__header-chevron {
  transform: rotate(-90deg);
}

.panel-right__section--collapsed
  .panel-right__content {
  display: none;
}

.panel-right__content {
  padding: 0 var(--space-sm) var(--space-sm);
}

/* ---------- Status Bar ---------- */

.status-bar {
  grid-area: status-bar;
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: 0 var(--space-sm);
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  user-select: none;
}

.status-bar__item {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.status-bar__spacer {
  flex: 1;
}

.status-bar__indicator {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 4px rgba(0, 240, 255, 0.5);
}