/* The dialog stays out of the page layout until opened. */
.calc-toolbar { flex-basis: 100%; display: flex; justify-content: flex-end; }
#calc-open, #calc-close { display: inline-flex; align-items: center; justify-content: center; gap: 9px; min-height: 44px; padding: 10px 16px; border: 1px solid var(--border); border-radius: 8px; background: var(--input-bg); color: var(--primary); font: inherit; font-size: .85rem; cursor: pointer; }
#calc-open:hover, #calc-close:hover { border-color: var(--accent); color: var(--accent); }
#calc-open:focus-visible, #calc-close:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
dialog.calculator { width: min(850px, calc(100% - 32px)); max-width: none; max-height: calc(100dvh - 32px); box-sizing: border-box; padding: 30px; border: 1px solid var(--border); border-radius: 16px; background: var(--card-bg); color: var(--primary); box-shadow: 0 24px 80px rgba(0,0,0,.5); overflow-y: auto; overscroll-behavior: contain; }
dialog.calculator:not([open]) { display: none; }
dialog.calculator::backdrop { background: rgba(4, 10, 20, .78); }
body.calc-modal-open { overflow: hidden; }
.calc-modal-top { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 20px; }
.calc-modal-top > span { font-size: .75rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1.5px; }
#calc-close { padding: 8px 12px; }
#calc-close span { font-size: 1.3rem; }
.calc-heading { display: flex; justify-content: space-between; align-items: center; gap: 20px; flex-wrap: wrap; margin-bottom: 22px; }
.calc-heading h2 { margin-bottom: 8px; }
.calc-heading p, .calc-help { color: var(--text-muted); font-size: .85rem; margin: 0; line-height: 1.6; }
.calc-switch { display: flex; align-items: center; gap: 10px; cursor: pointer; font-size: .9rem; }
.calc-switch input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.calc-track { width: 44px; height: 26px; border-radius: 20px; background: var(--border); padding: 3px; box-sizing: border-box; transition: background .2s; }
.calc-track::before { content: ''; display: block; width: 20px; height: 20px; border-radius: 50%; background: var(--primary); transition: transform .2s; }
.calc-switch input:checked + .calc-track { background: var(--accent-hover); }
.calc-switch input:checked + .calc-track::before { transform: translateX(18px); }
.calc-switch input:focus-visible + .calc-track { outline: 2px solid var(--primary); outline-offset: 4px; }
.calc-layout { display: grid; grid-template-columns: minmax(0, 1fr) minmax(220px, 300px); gap: 25px; }
.calc-display label { display: block; margin-bottom: 10px; font-size: .85rem; }
#calc-expression { width: 100%; box-sizing: border-box; background: var(--input-bg); border: 1px solid var(--border); border-radius: 8px; padding: 15px; color: var(--primary); font: inherit; font-size: 1.1rem; }
#calc-expression:focus { outline: 2px solid var(--accent); outline-offset: 2px; }
.calc-answer { margin: 20px 0 12px; padding: 18px; background: var(--input-bg); border-radius: 10px; }
.calc-answer span { display: block; color: var(--text-muted); font-size: .8rem; margin-bottom: 8px; }
#calc-result { display: block; color: var(--accent); font-size: 1.8rem; font-weight: 600; overflow-wrap: anywhere; font-variant-numeric: tabular-nums; }
#calc-status { min-height: 1.5em; color: var(--text-muted); font-size: .85rem; line-height: 1.5; }
#calc-status.calc-error { color: #fca5a5; }
.calc-keys { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.calc-keys button { min-height: 44px; border: 1px solid var(--border); border-radius: 8px; background: var(--input-bg); color: var(--primary); font: inherit; cursor: pointer; }
.calc-keys button:hover { border-color: var(--accent); background: var(--tag-bg); }
.calc-keys button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.calc-keys button:active { transform: translateY(1px); }
.calc-keys .calc-operator { color: var(--accent); }
.calc-keys #calc-submit { grid-column: span 4; background: var(--accent); color: #04130e; font-weight: 600; }
@media (max-width: 600px) { .calc-layout { grid-template-columns: minmax(0, 1fr); gap: 12px; } dialog.calculator { padding: 20px; } }
@media (prefers-reduced-motion: reduce) { .calc-track, .calc-track::before { transition: none; } }