*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  --bg: #0a0a0a;
  --surface: #141414;
  --surface-2: #1c1c1c;
  --border: #2a2a2a;
  --text: #e8e8e8;
  --text-muted: #888;
  --accent: #fff;
  --sidebar-w: 200px;
  --header-h: 48px;
  --font: "SF Pro Text", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

html,
body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  overflow: hidden;
}

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  padding: 0 16px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}

.logo {
  font-weight: 600;
  font-size: 12px;
}

.header-actions {
  display: flex;
  gap: 8px;
}

.btn {
  border: none;
  border-radius: 6px;
  padding: 8px 14px;
  font: inherit;
  cursor: pointer;
  transition: opacity 0.15s;
}

.btn:hover:not(:disabled) {
  opacity: 0.85;
}

.btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.btn-ghost {
  background: var(--surface-2);
  color: var(--text);
}

.btn-export {
  background: var(--accent);
  color: #000;
  font-weight: 600;
  margin-left: auto;
}

.workspace {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr var(--sidebar-w);
  height: calc(100vh - var(--header-h));
}

.sidebar {
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: 12px;
  overflow-y: auto;
}

.sidebar-right {
  border-right: none;
  border-left: 1px solid var(--border);
}

.panel-title {
  margin: 0 0 12px;
  font-size: 10px;
  color: var(--text-muted);
  font-weight: 500;
}

.layer-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.layer {
  display: grid;
  grid-template-columns: 52px 1fr 24px;
  align-items: center;
  gap: 8px;
  padding: 6px;
  border-radius: 8px;
  border: 1px solid transparent;
}

.layer-active {
  background: var(--surface-2);
  border-color: var(--border);
}

.layer-thumb {
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #000;
  cursor: pointer;
  overflow: hidden;
  width: 52px;
  height: 52px;
}

.layer-thumb:disabled {
  cursor: default;
  opacity: 0.5;
}

.layer-thumb-canvas {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.layer-name {
  font-size: 10px;
}

.layer-eye {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 14px;
  padding: 4px;
  line-height: 1;
}

.layer-eye.active {
  color: var(--text);
}

.hint {
  margin-top: 16px;
  color: var(--text-muted);
  font-size: 9px;
  line-height: 1.5;
  text-transform: none;
  letter-spacing: 0;
}

.canvas-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  background: var(--bg);
  overflow: hidden;
}

.canvas-area.drag-over {
  outline: 2px dashed var(--text-muted);
  outline-offset: -8px;
}

.canvas-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 0;
  padding: 24px;
  position: relative;
}

.canvas-wrap.bg-checker {
  background-image:
    linear-gradient(45deg, #1a1a1a 25%, transparent 25%),
    linear-gradient(-45deg, #1a1a1a 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #1a1a1a 75%),
    linear-gradient(-45deg, transparent 75%, #1a1a1a 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
  background-color: #111;
}

.canvas-wrap.bg-black {
  background: #000;
}

.canvas-wrap.bg-white {
  background: #fff;
}

.preview-canvas {
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  image-rendering: auto;
}

.preview-canvas.hidden {
  display: none;
}

.empty-state {
  text-align: center;
  color: var(--text-muted);
  pointer-events: none;
}

.empty-state.hidden {
  display: none;
}

.empty-sub {
  font-size: 10px;
  margin-top: 8px;
  text-transform: none;
  letter-spacing: 0;
}

.canvas-toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  margin-bottom: 20px;
  min-width: 320px;
}

.toolbar-select {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 6px;
  padding: 6px 10px;
  font: inherit;
  cursor: pointer;
}

.toolbar-format {
  color: var(--text-muted);
  padding: 0 4px;
}

.ctrl-panel.hidden {
  display: none;
}

.btn-full {
  width: 100%;
  text-align: center;
}

.control {
  margin-bottom: 20px;
}

.control label,
.control-label {
  display: block;
  margin-bottom: 8px;
  color: var(--text-muted);
  font-size: 10px;
}

.control input[type="range"] {
  width: calc(100% - 36px);
  vertical-align: middle;
  accent-color: var(--accent);
}

.control-value {
  display: inline-block;
  width: 28px;
  text-align: right;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.control-toggle .toggle-group {
  display: flex;
  gap: 4px;
}

.toggle {
  flex: 1;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text-muted);
  border-radius: 6px;
  padding: 8px 6px;
  font: inherit;
  font-size: 9px;
  cursor: pointer;
}

.toggle.active {
  background: var(--text);
  color: #000;
  border-color: var(--text);
}

@media (max-width: 720px) {
  .workspace {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr auto;
  }

  .sidebar-left,
  .sidebar-right {
    border: none;
    border-bottom: 1px solid var(--border);
  }

  :root {
    --sidebar-w: 100%;
  }
}