/**
 * layout.css
 * ----------
 * Structural layout (header / sidebar / canvas / controls grid) plus
 * component-specific styling for the sidebar list, control rows, palette
 * editor, and postfx bar. Colors/spacing/radii all come from tokens.css —
 * this file is about POSITION AND STRUCTURE, not color choices.
 */

body {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

/* ==================== HEADER ==================== */

.app-header {
  height: var(--header-height);
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: 0 var(--space-4);
  background: var(--surface-app-alt);
  border-bottom: 1px solid var(--glass-border);
  z-index: 10;
}

.app-brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 700;
  font-size: var(--fs-lg);
  white-space: nowrap;
}
.app-brand-icon { color: var(--accent); font-size: var(--fs-lg); }
.app-brand-accent { color: var(--accent); }

.aspect-bar {
  display: flex;
  gap: var(--space-1);
  overflow-x: auto;
  scrollbar-width: none;
}
.aspect-bar::-webkit-scrollbar { display: none; }

.aspect-preset-btn {
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  font-size: var(--fs-xs);
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  border: 1px solid transparent;
  white-space: nowrap;
}
.aspect-preset-btn:hover { background: rgba(255,255,255,0.06); color: var(--text-primary); }
.aspect-preset-btn.active {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: var(--accent);
}

.custom-size-inputs {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  flex-shrink: 0;
}
.size-input { width: 64px; text-align: center; }
.size-x { color: var(--text-tertiary); }

.app-header-right { margin-left: auto; flex-shrink: 0; }
.free-badge {
  font-size: var(--fs-xs);
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid rgba(52, 209, 127, 0.3);
  padding: 4px 10px;
  border-radius: 999px;
  font-weight: 600;
  white-space: nowrap;
}

/* ==================== APP BODY GRID ==================== */

.app-body {
  flex: 1;
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr var(--controls-width);
  gap: var(--space-3);
  padding: var(--space-3);
  min-height: 0;
}

/* ==================== LEFT SIDEBAR ==================== */

.tools-sidebar {
  display: flex;
  flex-direction: column;
  min-height: 0;
  padding: var(--space-3);
}

.sidebar-search-wrap { margin-bottom: var(--space-3); flex-shrink: 0; }
.sidebar-search-input { width: 100%; }

.tools-sidebar-nav {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.sidebar-category-header {
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  padding: var(--space-3) var(--space-2) var(--space-1);
  text-transform: uppercase;
}

.sidebar-tool-item {
  text-align: left;
  padding: var(--space-2);
  border-radius: var(--radius-sm);
  font-size: var(--fs-md);
  font-weight: 500;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.sidebar-tool-item:hover { background: rgba(255,255,255,0.05); color: var(--text-primary); }
.sidebar-tool-item.active {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 700;
}

/* ==================== CENTER CANVAS WORKSPACE ==================== */

.canvas-workspace {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  min-height: 0;
  min-width: 0;
}

.canvas-toolbar {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.active-tool-info {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
}
.active-tool-name { font-size: var(--fs-lg); font-weight: 700; }
.active-tool-meta { font-size: var(--fs-xs); color: var(--text-tertiary); font-family: var(--font-mono); }

.canvas-stage {
  flex: 1;
  min-height: 0;
  border-radius: var(--radius-lg);
  border: 1px solid var(--glass-border);
  /* Checkerboard pattern behind the (possibly transparent) canvas, matching the reference screenshot's dark grid workspace. */
  background-color: var(--surface-app);
  background-image:
    linear-gradient(45deg, rgba(255,255,255,0.035) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(255,255,255,0.035) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(255,255,255,0.035) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(255,255,255,0.035) 75%);
  background-size: 24px 24px;
  background-position: 0 0, 0 12px, 12px -12px, -12px 0px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

#main-canvas {
  box-shadow: 0 4px 40px rgba(0,0,0,0.5);
  border-radius: 2px;
}

/* ---- Bottom bar: postfx sliders + randomize/reset/export ---- */

.postfx-bar-wrap {
  flex-shrink: 0;
  padding: var(--space-3) var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-5);
  flex-wrap: wrap;
}

.postfx-bar {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex: 1;
  flex-wrap: wrap;
  min-width: 0;
}

.postfx-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-width: 140px;
}
.postfx-label { font-size: var(--fs-xs); color: var(--text-secondary); white-space: nowrap; }
.postfx-value {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--text-tertiary);
  width: 28px;
  text-align: right;
  flex-shrink: 0;
}

.bottom-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

.export-format-select { padding: 8px 10px; }

/* ==================== RIGHT CONTROLS PANEL ==================== */

.controls-sidebar {
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.controls-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-4) var(--space-3);
  border-bottom: 1px solid var(--glass-border);
  flex-shrink: 0;
}
.controls-header-title {
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
}

.preset-actions { display: flex; gap: var(--space-2); }
.preset-btn { font-size: var(--fs-xs); color: var(--text-secondary); font-weight: 600; }
.preset-btn:hover { color: var(--accent); }
.preset-btn-danger:hover { color: var(--danger); }

.controls-panel-body {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-2) var(--space-4) var(--space-5);
}

.panel-section-header {
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  text-transform: uppercase;
  margin: var(--space-4) 0 var(--space-2);
}
.panel-section-header:first-child { margin-top: var(--space-2); }

.control-row {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) 0;
  min-height: 32px;
}

.control-label {
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  flex: 1;
  min-width: 0;
}

.control-slider { flex: 1.4; min-width: 0; }
.control-value {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--text-tertiary);
  width: 32px;
  text-align: right;
  flex-shrink: 0;
}

.control-select { flex: 1.4; }

.control-none-btn {
  width: 20px; height: 20px;
  border-radius: 50%;
  color: var(--text-tertiary);
  font-size: 14px;
  line-height: 1;
  border: 1px solid var(--glass-border-strong);
}
.control-none-btn:hover { color: var(--danger); border-color: var(--danger); }

/* ---- Palette editor ---- */

.control-palette { align-items: flex-start; flex-direction: column; }
.palette-editor { width: 100%; display: flex; flex-direction: column; gap: var(--space-2); }
.palette-preset-select { width: 100%; }

.palette-slots {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.palette-slot {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 4px 0;
}
.palette-slot-label { font-size: var(--fs-xs); color: var(--text-tertiary); flex: 1; }

.palette-remove-btn {
  width: 20px; height: 20px;
  border-radius: 50%;
  color: var(--text-tertiary);
  font-size: 14px;
  line-height: 1;
  border: 1px solid var(--glass-border-strong);
  flex-shrink: 0;
}
.palette-remove-btn:hover { color: var(--danger); border-color: var(--danger); }

.palette-add-btn {
  font-size: var(--fs-xs);
  font-weight: 700;
  color: var(--accent);
  text-align: left;
  padding: var(--space-1) 0;
}
.palette-add-btn:hover { text-decoration: underline; }

/* ==================== RESPONSIVE ====================
 * Below ~1100px, collapse to a single-column stack (canvas on top, both
 * panels below) so the tool remains usable on tablets. A true mobile-first
 * redesign is out of scope for v1 but this keeps things from breaking. */
@media (max-width: 1100px) {
  .app-body {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto 1fr;
    overflow-y: auto;
  }
  .tools-sidebar { max-height: 220px; }
  .canvas-stage { min-height: 320px; }
}