/* Desktop companion to the existing back-to-top control. */
.floating-calculator { color: var(--ink); font-size: 14px; }
.floating-calculator [hidden], .floating-calculator[hidden] { display: none !important; }
.calculator-launcher {
  position: fixed; z-index: 16; right: max(12px, env(safe-area-inset-right));
  bottom: max(116px, calc(104px + env(safe-area-inset-bottom)));
  width: 44px; height: 44px; display: grid; place-items: center;
  padding: 0; border: 1px solid var(--accent); border-radius: 50%;
  color: var(--accent-deep); background: var(--surface); cursor: pointer;
}
.calculator-launcher:hover, .calculator-launcher[aria-expanded="true"] { color: var(--surface); background: var(--accent-deep); }
.calculator-panel {
  position: fixed; z-index: 17; right: max(68px, calc(56px + env(safe-area-inset-right))); bottom: 12px;
  width: 276px; max-height: calc(100dvh - 24px); overflow-y: auto; overscroll-behavior: contain;
  padding: 12px; border-radius: var(--radius); background: var(--surface); box-shadow: 0 12px 40px rgba(21,32,51,.22);
  scrollbar-color: var(--accent) var(--paper); scrollbar-width: thin;
}
.calculator-heading { display: flex; align-items: center; justify-content: space-between; gap: 6px; }
.calculator-heading { cursor: grab; touch-action: none; user-select: none; }
.calculator-heading.is-dragging { cursor: grabbing; }
.calculator-heading h2 { flex: 1; margin: 0; font: inherit; font-size: 16px; font-weight: 700; }
.floating-calculator button { font-family: inherit; font-size: 13px; cursor: pointer; touch-action: manipulation; }
.calculator-panel button { min-height: 32px; border: 1px solid var(--line); border-radius: 6px; background: var(--paper); color: var(--ink); padding: 4px; }
.calculator-heading button { display: grid; place-items: center; width: 32px; background: transparent; }
.calculator-modes { display: flex; justify-content: space-between; gap: 6px; margin: 6px 0 8px; }
.calculator-modes button { color: var(--accent-deep); padding-inline: 10px; }
.calculator-label { display: block; font-size: 12px; color: var(--muted); }
#calculator-expression { display: block; width: 100%; min-height: 32px; border: 1px solid var(--line); border-radius: 6px; padding: 8px; background: var(--paper); color: var(--ink); font: inherit; font-size: 16px; caret-color: var(--accent); }
#calculator-expression::placeholder { color: var(--muted); }
.calculator-result { display: block; min-height: 40px; padding: 6px 0; text-align: right; font-size: 22px; font-weight: 650; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.calculator-result.calculator-error { color: #a12d22; font-size: 14px; text-align: left; }
.calculator-keys, .calculator-science { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 4px; }
.calculator-science { margin-bottom: 8px; }
.calculator-keys [data-action="delete"] { display: grid; place-items: center; }
.calculator-science button { color: var(--accent-deep); }
.calculator-keys [data-action="equals"] { grid-column: span 3; background: var(--accent-deep); color: var(--surface); border-color: var(--accent-deep); }
.calculator-panel button:hover { background: var(--line); color: var(--ink); }
.floating-calculator :focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.calculator-panel ::selection { background: var(--accent-deep); color: var(--surface); }
#calculator-help { color: var(--muted); font-size: 11px; line-height: 1.4; margin: 8px 0 0; }
@media (max-width: 1023px), print { .floating-calculator { display: none !important; } }

.calculator-heading [data-action="move"] { cursor: grab; }
.calculator-heading.is-dragging [data-action="move"] { cursor: grabbing; }