:root {
  --bg: #f5f5f4;
  --panel: #ffffff;
  --ink: #1a1a1a;
  --ink-soft: #555;
  --line: #e2e0dc;
  --accent: #1a1a1a;
  --accent-fg: #fff;
  --hover: #f0efec;
  --canvas-bg: #d9d6d0;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  font: 13px/1.4 -apple-system, BlinkMacSystemFont, "Helvetica Neue", Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
}

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

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 18px;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
  flex: 0 0 auto;
}

.brand h1 {
  margin: 0;
  font-size: 16px;
  letter-spacing: -0.01em;
}

.brand .tag {
  margin: 2px 0 0;
  color: var(--ink-soft);
  font-size: 11px;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink);
  font: inherit;
  cursor: pointer;
  user-select: none;
  transition: background .12s, border-color .12s;
}

.btn:hover:not(:disabled) { background: var(--hover); }
.btn:disabled { opacity: .4; cursor: not-allowed; }

.btn.primary {
  background: var(--accent);
  color: var(--accent-fg);
  border-color: var(--accent);
}

.btn.primary:hover:not(:disabled) {
  background: #333;
}

.btn.small { padding: 4px 10px; font-size: 12px; }

.layout {
  flex: 1 1 auto;
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 0;
}

.sidebar {
  background: var(--panel);
  border-right: 1px solid var(--line);
  overflow-y: auto;
  padding: 8px;
}

.group {
  border: 1px solid var(--line);
  border-radius: 6px;
  margin-bottom: 8px;
  background: #fafaf8;
}

.group > summary {
  padding: 8px 12px;
  font-weight: 600;
  cursor: pointer;
  user-select: none;
  list-style: none;
  font-size: 12px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.group > summary::-webkit-details-marker { display: none; }
.group > summary::before {
  content: "+";
  display: inline-block;
  width: 14px;
  color: var(--ink-soft);
}
.group[open] > summary::before { content: "−"; }

.group > .row,
.group > label.row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  font-size: 12px;
}

.row + .row { border-top: 1px solid var(--line); }

[hidden] { display: none !important; }

.row input[type="number"],
.row input[type="text"],
.row select {
  width: 110px;
  padding: 4px 6px;
  border: 1px solid var(--line);
  border-radius: 4px;
  font: inherit;
  background: white;
}

.row input[type="text"] { width: 130px; }

.row input[type="color"] {
  width: 40px;
  height: 24px;
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 0;
  background: white;
  cursor: pointer;
}

.row input[type="checkbox"] {
  margin-right: auto;
  margin-left: 0;
}

.row.inline {
  padding: 0;
  border: 0;
  gap: 6px;
}

.help {
  margin: 0;
  padding: 6px 12px 10px;
  font-size: 11px;
  color: var(--ink-soft);
}

.preview-pane {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.preview-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
  font-size: 12px;
}

.preview-bar .sep {
  flex: 1;
}

.preview-bar input[type="range"] {
  width: 120px;
}

.page-size {
  color: var(--ink-soft);
  font-variant-numeric: tabular-nums;
}

.canvas-wrap {
  flex: 1 1 auto;
  background: var(--canvas-bg);
  overflow: auto;
  display: grid;
  place-items: center;
  padding: 24px;
  position: relative;
}

#previewCanvas {
  background: white;
  box-shadow: 0 6px 24px rgba(0,0,0,0.18);
  display: none;
}

.canvas-wrap.has-pdf #previewCanvas { display: block; }
.canvas-wrap.has-pdf #emptyState { display: none; }

.empty {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  pointer-events: none;
  color: var(--ink-soft);
}

.canvas-wrap.dragover .empty {
  background: rgba(255,255,255,0.4);
  outline: 2px dashed var(--accent);
  outline-offset: -16px;
}

.empty-inner {
  text-align: center;
  pointer-events: auto;
}

.empty-icon {
  font-size: 40px;
  font-weight: 200;
  color: var(--line);
  line-height: 1;
  margin-bottom: 8px;
}

.status {
  padding: 6px 14px;
  font-size: 11px;
  color: var(--ink-soft);
  background: var(--panel);
  border-top: 1px solid var(--line);
  min-height: 22px;
}

.status.error { color: #c0392b; }