:root {
  --bg: #e9ebee;
  --panel: #ffffff;
  --border: #d7dbe0;
  --text: #1f2430;
  --muted: #6b7280;
  --accent: #2f6fed;
  --accent-hover: #1f5bd1;
  --danger: #e0433d;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  font-size: 14px;
}

#topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  padding: 10px 16px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
}

#topbar-left, #topbar-tools {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.btn {
  background: #f3f4f6;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 7px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  line-height: 1.2;
}
.btn:hover { background: #e9ebef; }
.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 600;
}
.btn.primary:hover { background: var(--accent-hover); }
.btn.tool.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.muted { color: var(--muted); font-size: 13px; }

.sep {
  width: 1px;
  height: 22px;
  background: var(--border);
  margin: 0 4px;
}

#fontSize {
  width: 56px;
  padding: 6px;
  border: 1px solid var(--border);
  border-radius: 6px;
}
#fontColor {
  width: 32px;
  height: 32px;
  padding: 2px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: none;
  cursor: pointer;
}

.hidden { display: none !important; }

#workspace {
  padding: 24px;
  min-height: calc(100vh - 54px);
  display: flex;
  justify-content: center;
}

#emptyState {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding-top: 6vh;
}
.empty-card h1 { margin: 0 0 8px; font-size: 1.5em; }
.seo-content { max-width: 720px; margin: 48px auto 32px; color: var(--muted); line-height: 1.6; }
.seo-content h2 { color: var(--text); font-size: 1.2em; margin: 28px 0 8px; }
.seo-content h3 { color: var(--text); font-size: 1em; margin: 16px 0 4px; }
.seo-content ul, .seo-content ol { padding-left: 22px; }
.empty-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 40px 48px;
  text-align: center;
  max-width: 520px;
}
.empty-card h2 { margin: 0 0 8px; }
.empty-card p { color: var(--muted); line-height: 1.5; margin-bottom: 20px; }

#pagesContainer {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.page-wrap {
  position: relative;
  background: #fff;
  box-shadow: 0 1px 4px rgba(0,0,0,0.15), 0 0 0 1px rgba(0,0,0,0.04);
}

.page-wrap canvas.bg-canvas {
  display: block;
}

.page-number {
  position: absolute;
  top: -22px;
  left: 0;
  font-size: 12px;
  color: var(--muted);
}

.overlay-layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  cursor: text;
}

.edit-layer {
  position: absolute;
  top: 0;
  left: 0;
  pointer-events: none;
}

/* No border/padding: the box's content area must line up exactly with the
   text underneath, so outlines are used for hover/selection feedback. */
.text-box {
  position: absolute;
  border: 0;
  outline: 1px dashed transparent;
  cursor: text;
  white-space: pre;
  user-select: none;
  padding: 0;
  margin: 0;
  line-height: 1.2;
}
.text-box:hover {
  outline-color: rgba(47,111,237,0.6);
}
.text-box.selected {
  outline-color: var(--accent);
  background: rgba(47,111,237,0.06);
}
.text-box.editing {
  outline: 1px solid var(--accent);
  user-select: text;
  z-index: 5;
}

.btn.toggle.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
#fontFamily, #textAlign {
  padding: 6px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
  font-size: 13px;
}

.erase-drag-preview {
  position: absolute;
  border: 1.5px dashed var(--danger);
  background: rgba(224, 67, 61, 0.12);
  pointer-events: none;
}

#deleteHandle {
  position: fixed;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--danger);
  color: #fff;
  font-size: 12px;
  align-items: center;
  justify-content: center;
  text-align: center;
  cursor: pointer;
  display: none;
  z-index: 1000;
  box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}

#toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: #1f2430;
  color: #fff;
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 13px;
  z-index: 100;
  box-shadow: 0 4px 14px rgba(0,0,0,0.25);
}

.spinner-overlay {
  position: fixed;
  inset: 0;
  background: rgba(255,255,255,0.65);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  font-size: 15px;
  font-weight: 600;
}