/* ---- calculatrice flottante (js/calc.js) ---- */
#calcFab {
    position: fixed; right: 24px; bottom: 24px; z-index: 40;
    width: 54px; height: 54px; border-radius: 50%; display: grid; place-items: center; padding: 0;
    background: var(--surface2); color: var(--accent); border: 1px solid var(--line);
    box-shadow: var(--shadow, 0 8px 24px rgba(0, 0, 0, .25)); opacity: .94;
    transition: transform .12s, opacity .18s, visibility 0s;
    -webkit-tap-highlight-color: transparent; touch-action: manipulation;
}
#calcFab:hover { opacity: 1; border-color: var(--accent); }
#calcFab:active { transform: scale(.94); }
#calcFab.off { opacity: 0; visibility: hidden; pointer-events: none; transform: scale(.8); transition: transform .12s, opacity .18s, visibility 0s .18s; }

#calc {
    position: fixed; right: 24px; bottom: 24px; z-index: 45; width: 340px; max-width: calc(100vw - 32px);
    max-height: calc(100vh - 48px); max-height: calc(100dvh - 48px); overflow-y: auto; overscroll-behavior: contain;
    background: var(--surface); color: var(--text); border: 1px solid var(--line); border-radius: 18px;
    box-shadow: 0 18px 50px rgba(0, 0, 0, .35); padding: 10px 12px 12px;
    font-family: var(--fb); font-size: 16px; line-height: 1.2;
    visibility: hidden; opacity: 0; transform: translateY(18px); pointer-events: none;
    transition: opacity .18s ease, transform .22s ease, visibility 0s .22s;
}
#calc.open { visibility: visible; opacity: 1; transform: none; pointer-events: auto; transition: opacity .18s ease, transform .22s ease, visibility 0s; }
[data-theme=light] #calc { box-shadow: 0 14px 40px rgba(23, 32, 59, .18); }

.calc-head { display: flex; align-items: center; gap: 8px; min-height: 36px; }
.calc-deg { flex: none; font-size: .68rem; font-weight: 600; letter-spacing: .08em; color: var(--ok); border: 1px solid var(--ok); border-radius: 6px; padding: 3px 6px; }
.calc-hist { flex: 1; min-width: 0; display: flex; gap: 6px; overflow-x: auto; overflow-y: hidden; scrollbar-width: none; padding: 2px; }
.calc-hist::-webkit-scrollbar { display: none; }
.calc-chip:first-child { margin-left: auto; }
.calc-chip { flex: none; height: 32px; padding: 0 8px; border-radius: 9px; border: 1px solid var(--line); background: transparent; color: var(--muted); font-size: .76rem; font-variant-numeric: tabular-nums; white-space: nowrap; touch-action: manipulation; }
.calc-chip:hover { color: var(--text); border-color: var(--accent); }
.calc-close { flex: none; width: 36px; height: 36px; margin-right: -4px; border-radius: 50%; border: 0; background: transparent; color: var(--muted); display: grid; place-items: center; padding: 0; }
.calc-close:hover { background: var(--surface2); color: var(--text); }

.calc-screen { background: var(--bg); border: 1px solid var(--line); border-radius: 12px; padding: 8px 12px; margin: 6px 0 10px; font-variant-numeric: tabular-nums; }
.calc-expr { min-height: 1.75rem; font-size: 1.12rem; line-height: 1.75rem; color: var(--text); white-space: nowrap; overflow-x: auto; overflow-y: hidden; scrollbar-width: none; }
.calc-expr::-webkit-scrollbar { display: none; }
.calc-expr sup, .calc-res sup, .calc-k sup, .calc-chip sup { font-size: .68em; line-height: 0; vertical-align: super; }
.calc-ph { color: var(--muted); }
.calc-caret { display: inline-block; width: 2px; height: 1.15em; margin-left: 2px; vertical-align: -0.2em; background: var(--accent); animation: calc-blink 1.1s steps(1) infinite; }
@keyframes calc-blink { 50% { opacity: 0; } }
.calc-res { min-height: 2.2rem; font-family: var(--fh); font-weight: 600; font-size: 1.6rem; line-height: 2.2rem; text-align: right; white-space: nowrap; overflow-x: auto; overflow-y: hidden; scrollbar-width: none; }
.calc-res::-webkit-scrollbar { display: none; }
.calc-res.long { font-size: 1.25rem; }
.calc-res.err { font-family: var(--fb); font-weight: 500; font-size: .86rem; line-height: 1.35; color: var(--bad); text-align: left; white-space: normal; padding: 3px 0; }

.calc-keys { display: grid; grid-template-columns: repeat(5, 1fr); gap: 7px; }
.calc-k {
    min-height: 46px; min-width: 0; padding: 0 2px; border-radius: 11px; border: 1px solid transparent;
    background: var(--surface2); color: var(--text); font-size: 1.15rem; font-weight: 500; line-height: 1;
    -webkit-user-select: none; user-select: none; touch-action: manipulation; -webkit-tap-highlight-color: transparent;
    transition: transform .06s, filter .12s;
}
.calc-k:active { transform: scale(.95); filter: brightness(1.2); }
[data-theme=light] .calc-k:active { filter: brightness(.93); }
.calc-k.k-fn { background: transparent; border-color: var(--line); color: var(--muted); font-size: .95rem; }
.calc-k.k-fn:hover { color: var(--text); }
.calc-k.k-op { background: var(--def-bg, rgba(138, 164, 255, .11)); color: var(--accent); font-size: 1.35rem; }
.calc-k.k-del { background: transparent; border-color: var(--line); color: var(--bad); font-size: 1rem; }
.calc-k.k-hl { background: var(--warm-bg, rgba(255, 184, 92, .12)); border-color: var(--warm); color: var(--warm); font-size: .95rem; font-weight: 600; }
.calc-k.k-eq { background: var(--accent); color: var(--accent-ink); font-size: 1.45rem; font-weight: 600; }

/* la page reste défilable jusqu'au bout sous la calculatrice */
html.calc-open main { padding-bottom: calc(var(--calc-h, 420px) + 48px) !important; }

@media (max-width: 780px) {
    #calcFab { right: 16px; bottom: calc(84px + env(safe-area-inset-bottom)); }
    #calc {
        left: 0; right: 0; bottom: var(--calc-tabs, calc(64px + env(safe-area-inset-bottom)));
        width: auto; max-width: none; border-radius: 18px 18px 0 0; border-width: 1px 0 0;
        max-height: calc(100vh - var(--calc-tabs, 64px) - 56px); max-height: calc(100dvh - var(--calc-tabs, 64px) - 56px);
        padding: 8px max(12px, env(safe-area-inset-right)) 10px max(12px, env(safe-area-inset-left));
        box-shadow: 0 -10px 30px rgba(0, 0, 0, .3); transform: translateY(40px);
    }
    [data-theme=light] #calc { box-shadow: 0 -8px 24px rgba(23, 32, 59, .12); }
    .calc-keys { gap: 6px; max-width: 520px; margin: 0 auto; }
    .calc-k { min-height: 44px; }
    html.calc-open main { padding-bottom: calc(var(--calc-h, 420px) + 110px) !important; }
}

@media (prefers-reduced-motion: reduce) {
    #calc, #calc.open, #calcFab, #calcFab.off, .calc-k { transition: none !important; }
    #calc { transform: none; }
    .calc-caret { animation: none !important; }
}