.qd-root {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  outline: none;
  background: #fbf9f4;
  touch-action: none;
  border-radius: inherit;
  transition: background 320ms ease;
  container-type: inline-size;

  /* light-theme chrome */
  --qd-bar-bg: rgba(255, 255, 255, 0.88);
  --qd-pop-bg: rgba(255, 255, 255, 0.94);
  --qd-border: rgba(28, 27, 24, 0.12);
  --qd-bar-shadow: 0 4px 16px rgba(28, 27, 24, 0.14);
  --qd-pop-shadow: 0 8px 28px rgba(28, 27, 24, 0.2);
  --qd-ink: rgba(28, 27, 24, 0.82);
  --qd-ink-strong: rgba(28, 27, 24, 0.94);
  --qd-ink-soft: rgba(28, 27, 24, 0.55);
  --qd-ink-faint: rgba(28, 27, 24, 0.4);
  --qd-hover: rgba(28, 27, 24, 0.07);
  --qd-hover-strong: rgba(28, 27, 24, 0.1);
  --qd-active: rgba(28, 27, 24, 0.12);
  --qd-on-bg: #211d14;
  --qd-on-ink: #fbf9f4;
  --qd-divider: rgba(28, 27, 24, 0.14);
  --qd-menu-div: rgba(28, 27, 24, 0.1);
  --qd-seg-bg: rgba(28, 27, 24, 0.07);
  --qd-dot-ring: rgba(28, 27, 24, 0.12);
}
.qd-root[data-qd-theme='dark'] {
  background: #191713;

  /* dark-theme chrome: the original dark glass */
  --qd-bar-bg: rgba(19, 17, 13, 0.72);
  --qd-pop-bg: rgba(19, 17, 13, 0.85);
  --qd-border: rgba(255, 255, 255, 0.14);
  --qd-bar-shadow: 0 4px 16px rgba(10, 8, 4, 0.25);
  --qd-pop-shadow: 0 8px 28px rgba(10, 8, 4, 0.35);
  --qd-ink: rgba(255, 255, 255, 0.85);
  --qd-ink-strong: rgba(255, 255, 255, 0.95);
  --qd-ink-soft: rgba(255, 255, 255, 0.62);
  --qd-ink-faint: rgba(255, 255, 255, 0.4);
  --qd-hover: rgba(255, 255, 255, 0.1);
  --qd-hover-strong: rgba(255, 255, 255, 0.12);
  --qd-active: rgba(255, 255, 255, 0.22);
  --qd-on-bg: rgba(255, 255, 255, 0.92);
  --qd-on-ink: #211d14;
  --qd-divider: rgba(255, 255, 255, 0.16);
  --qd-menu-div: rgba(255, 255, 255, 0.1);
  --qd-seg-bg: rgba(255, 255, 255, 0.08);
  --qd-dot-ring: rgba(255, 255, 255, 0.12);
}

/* snapshot of the outgoing theme, faded out by the editor on setTheme() */
.qd-theme-fade {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 20; /* over canvas + overlay, under the floating chrome */
  pointer-events: none;
  opacity: 1;
  transition: opacity 320ms ease;
}

.qd-canvas, .qd-overlay {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.qd-overlay { pointer-events: none; }

/* ---- floating chrome ---- */
/* The theme switch rides these transitions; hovers use the same clock, which
   at 140–320ms still reads as instant. */
.qd-ui { position: absolute; inset: 0; pointer-events: none; z-index: 40; }
.qd-ui.qd-hidden { display: none; }
.qd-ui button { -webkit-tap-highlight-color: transparent; }

.qd-dock {
  position: absolute;
  left: 50%;
  bottom: 10px;
  transform: translateX(-50%);
  transform-origin: 50% 100%;
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 5px 7px;
  border-radius: 999px;
  background: var(--qd-bar-bg);
  border: 1px solid var(--qd-border);
  box-shadow: var(--qd-bar-shadow);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  pointer-events: auto;
  transition: background 320ms ease, border-color 320ms ease, box-shadow 320ms ease;
}

/* history + selection actions: a vertical pill hugging the left edge.
   Hosts with their own chrome there can move it via the custom props. */
.qd-actions {
  position: absolute;
  left: var(--qd-actions-left, 10px);
  top: var(--qd-actions-top, 50%);
  transform: translateY(var(--qd-actions-shift, -50%));
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 6px 4px;
  border-radius: 999px;
  background: var(--qd-bar-bg);
  border: 1px solid var(--qd-border);
  box-shadow: var(--qd-bar-shadow);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  pointer-events: auto;
  transition: background 320ms ease, border-color 320ms ease, box-shadow 320ms ease;
}
.qd-actions button svg { width: 17px; height: 17px; display: block; }
.qd-actions .qd-div { width: 18px; height: 1px; margin: 3px 0; }
.qd-actions button:hover { background: var(--qd-hover); }
.qd-actions button:disabled { opacity: 0.32; pointer-events: none; }
.qd-actions .qd-tool { width: 30px; height: 30px; }

.qd-tool, .qd-dock button {
  width: 32px;
  height: 32px;
  flex: none;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: 9px;
  background: transparent;
  color: var(--qd-ink);
  cursor: pointer;
  padding: 0;
  transition: background 140ms ease, color 140ms ease;
}
.qd-dock button svg { width: 19px; height: 19px; display: block; }
.qd-dock button:hover { background: var(--qd-hover); }
.qd-dock button.on { background: var(--qd-on-bg); color: var(--qd-on-ink); }
.qd-dock button:disabled { opacity: 0.32; pointer-events: none; }
.qd-div { width: 1px; height: 20px; margin: 0 3px; background: var(--qd-divider); flex: none; transition: background 320ms ease; }
.qd-dock.qd-compact { gap: 2px; }

.qd-geo-btn { position: relative; }
.qd-geo-btn::after {
  content: '';
  position: absolute;
  right: 3px;
  bottom: 3px;
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-bottom: 4px solid currentColor;
  opacity: 0.65;
}

.qd-style-btn { position: relative; }
.qd-style-dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2.5px solid var(--qd-on-bg);
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.2);
  transition: border-color 320ms ease;
}
.qd-style-btn.on .qd-style-dot { border-color: var(--qd-on-ink); }

/* ---- popovers ---- */
.qd-popover {
  position: absolute;
  bottom: 54px;
  left: 50%;
  border-radius: 13px;
  background: var(--qd-pop-bg);
  border: 1px solid var(--qd-border);
  box-shadow: var(--qd-pop-shadow);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  pointer-events: auto;
  padding: 8px;
  max-width: calc(100% - 16px);
  box-sizing: border-box;
  transition: background 320ms ease, border-color 320ms ease, box-shadow 320ms ease;
  /* rise out of the dock: a short fade + lift + settle */
  transform-origin: 50% 100%;
  animation: qd-pop-in 160ms cubic-bezier(0.2, 0.9, 0.3, 1.15);
}
@keyframes qd-pop-in {
  from { opacity: 0; transform: translateY(7px) scale(0.96); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
@media (prefers-reduced-motion: reduce) {
  .qd-popover { animation: none; }
}

/* every popover tool icon needs the explicit size — an unsized svg falls back
   to its intrinsic 300×150 and overflows the 32px button (invisible on iOS) */
.qd-popover .qd-tool svg { width: 19px; height: 19px; display: block; }

.qd-geo-pop { display: flex; gap: 2px; flex-wrap: wrap; }
.qd-geo-pop .qd-tool { color: var(--qd-ink); }

/* overflow tools ("more" flyout / folded kit) */
.qd-grid-pop { display: grid; grid-template-columns: repeat(4, 32px); gap: 2px; }
.qd-grid-pop .qd-tool { color: var(--qd-ink); }
.qd-grid-pop .qd-tool.on { background: var(--qd-on-bg); color: var(--qd-on-ink); }

.qd-style-pop { width: 196px; }
.qd-row { display: flex; align-items: center; justify-content: space-between; }
.qd-row + .qd-row { margin-top: 7px; padding-top: 7px; border-top: 1px solid var(--qd-menu-div); }
.qd-colors { display: grid; grid-template-columns: repeat(6, 1fr); gap: 3px; }
.qd-dot {
  width: 26px;
  height: 26px;
  border-radius: 8px;
  border: none;
  background: transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  padding: 0;
  transition: background 140ms ease;
}
.qd-dot::before {
  content: '';
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--dot);
  box-shadow: 0 0 0 1px var(--qd-dot-ring);
}
.qd-dot:hover { background: var(--qd-hover); }
.qd-dot.on { background: var(--qd-active); }

.qd-opt {
  width: 40px;
  height: 30px;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--qd-ink);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  padding: 0;
  transition: background 140ms ease, color 140ms ease;
}
.qd-opt svg { width: 20px; height: 20px; }
.qd-opt:hover { background: var(--qd-hover); }
.qd-opt.on { background: var(--qd-on-bg); color: var(--qd-on-ink); }
.qd-size-pip {
  width: var(--pip);
  height: var(--pip);
  border-radius: 50%;
  background: currentColor;
}

.qd-menu-pop { display: flex; flex-direction: column; min-width: 232px; padding: 6px; }
.qd-menu-item {
  display: flex;
  align-items: center;
  gap: 10px;
  border: none;
  background: transparent;
  color: var(--qd-ink-strong);
  text-align: left;
  font: 500 12.5px -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  padding: 7px 10px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 140ms ease, color 140ms ease;
}
.qd-menu-item:hover { background: var(--qd-hover); }
.qd-mi-ico { display: flex; flex: 0 0 16px; color: var(--qd-ink-soft); }
.qd-mi-ico svg { width: 16px; height: 16px; }
.qd-menu-item:hover .qd-mi-ico { color: inherit; }
.qd-mi-label { flex: 1 1 auto; white-space: nowrap; }
.qd-mi-key {
  flex: 0 0 auto;
  color: var(--qd-ink-faint);
  font-size: 11px;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
}
.qd-menu-div { display: block; height: 1px; margin: 5px 4px; background: var(--qd-menu-div); }

/* labelled rows of mutually exclusive icon buttons (grid, theme) */
.qd-menu-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 4px 10px 4px 10px;
  color: var(--qd-ink-strong);
  font: 500 12.5px -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}
.qd-menu-row + .qd-menu-row { margin-top: 2px; }
.qd-seg {
  display: flex;
  gap: 2px;
  padding: 2px;
  border-radius: 9px;
  background: var(--qd-seg-bg);
  transition: background 320ms ease;
}
.qd-seg-btn {
  width: 30px;
  height: 26px;
  border: none;
  border-radius: 7px;
  background: transparent;
  color: var(--qd-ink);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  padding: 0;
  transition: background 120ms ease, color 120ms ease;
}
.qd-seg-btn svg { width: 16px; height: 16px; }
.qd-seg-btn:hover { background: var(--qd-hover-strong); color: var(--qd-ink-strong); }
.qd-seg-btn.on { background: var(--qd-on-bg); color: var(--qd-on-ink); }

/* nested dropdown (grid backdrop): a flyout beside the parent row */
.qd-mi-value { flex: 0 0 auto; color: var(--qd-ink-faint); font-size: 11.5px; }
.qd-mi-chev, .qd-mi-check { flex: 0 0 14px; display: flex; color: var(--qd-ink-faint); }
.qd-mi-chev svg, .qd-mi-check svg { width: 14px; height: 14px; }
.qd-mi-check { color: var(--qd-ink); }
.qd-has-sub { position: relative; }
.qd-has-sub.sub-open { background: var(--qd-hover); }
.qd-submenu {
  position: absolute;
  left: calc(100% + 2px);
  top: -7px; /* first sub-row lines up with the parent row */
  display: none;
  flex-direction: column;
  min-width: 148px;
  padding: 6px;
  border-radius: 13px;
  background: var(--qd-pop-bg);
  border: 1px solid var(--qd-border);
  box-shadow: var(--qd-pop-shadow);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  animation: qd-sub-in 130ms ease;
}
.qd-has-sub.sub-open .qd-submenu { display: flex; }
.qd-submenu.qd-sub-left { left: auto; right: calc(100% + 2px); }
@keyframes qd-sub-in {
  from { opacity: 0; transform: translateX(-4px); }
  to { opacity: 1; transform: none; }
}
.qd-submenu.qd-sub-left { animation-name: qd-sub-in-left; }
@keyframes qd-sub-in-left {
  from { opacity: 0; transform: translateX(4px); }
  to { opacity: 1; transform: none; }
}
@media (prefers-reduced-motion: reduce) {
  .qd-submenu { animation: none; }
}


/* ---- text editing ---- */
.qd-text-edit {
  position: absolute;
  z-index: 30;
  background: transparent;
  border: none;
  outline: 1.5px dashed rgba(110, 140, 200, 0.55);
  outline-offset: 3px;
  border-radius: 2px;
  resize: none;
  overflow: hidden;
  padding: 0;
  margin: 0;
  white-space: pre-wrap;
  caret-color: currentColor;
  -webkit-user-select: text;
  user-select: text;
}
/* 页面级样式 */
html, body { margin: 0; height: 100%; }
#board { position: fixed; inset: 0; }
.theme-toggle {
  position: fixed; top: 10px; right: 10px; z-index: 50;
  font: 500 13px system-ui, "PingFang SC", "Microsoft YaHei", sans-serif;
  padding: 6px 12px; border-radius: 999px;
  border: 1px solid rgba(0,0,0,0.15); background: #fff; cursor: pointer;
}
/* 关于弹窗 */
.qd-about-pop { width: 252px; padding: 12px 14px; }
.qd-about-title {
  font: 600 13px system-ui, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--qd-ink-strong); margin-bottom: 6px;
}
.qd-about-body p {
  margin: 0 0 6px;
  font: 400 12px/1.6 system-ui, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--qd-ink-soft);
}
.qd-about-body p:last-child { margin-bottom: 0; }
.qd-about-link {
  display: block; margin-top: 8px;
  font: 500 12px system-ui, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--qd-ink-strong); text-decoration: none;
}
.qd-about-link:hover { text-decoration: underline; }