/* Calculadora científica (calc.js): botón arriba a la derecha y panel flotante. */

/* ---------- botón ---------- */
.calc-fab {
  width: 36px;
  height: 36px;
  display: inline-grid;
  place-items: center;
  border-radius: 99px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  box-shadow: var(--shadow);
  cursor: pointer;
}
.calc-fab:hover, .calc-fab[aria-pressed="true"] { border-color: var(--accent); color: var(--accent); }
.calc-fab svg, .calc-mbar-btn svg, .calc-iconbtn svg, .calc-h-copy svg {
  width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; display: block;
}
.calc-mbar-btn { display: none; }
@media (max-width: 960px) {
  .calc-fab { display: none; }
  .calc-mbar-btn { display: inline-grid; }
}

/* ---------- panel ---------- */
.calc-panel {
  position: fixed;
  z-index: 48;
  top: 60px;
  right: 18px;
  width: 340px;
  max-height: calc(100vh - 76px);
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  box-shadow: 0 10px 34px rgb(0 0 0 / 0.18);
  overflow: hidden;
}
.calc-panel[hidden] { display: none; }
body.ai-open .calc-panel { right: calc(var(--ai-w) + 18px); }
@media (max-width: 600px) {
  .calc-panel { top: auto; bottom: 0; left: 0 !important; right: 0 !important; width: auto; max-height: 92vh; border-radius: 14px 14px 0 0; }
}

.calc-head {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 8px 8px 14px;
  border-bottom: 1px solid var(--border);
  cursor: grab;
  user-select: none;
  touch-action: none;
}
.calc-head strong { flex: 1; font-size: 0.92rem; }
.calc-mode {
  padding: 3px 9px;
  border: 1px solid var(--accent);
  border-radius: 99px;
  background: var(--accent-soft);
  color: var(--accent);
  font: 700 0.74rem var(--font-mono);
  letter-spacing: 0.04em;
  cursor: pointer;
}
.calc-iconbtn {
  display: inline-grid; place-items: center; min-width: 28px; height: 28px; padding: 0 6px;
  border: 0; border-radius: 7px; background: none; color: var(--text-muted); font: 0.78rem var(--font-sans); cursor: pointer;
}
.calc-iconbtn:hover { background: var(--surface-2); color: var(--text); }

/* historial */
.calc-history { flex: 1 1 auto; min-height: 60px; max-height: 210px; overflow-y: auto; padding: 6px 8px; background: var(--bg); }
.calc-empty { margin: 8px 6px; font-size: 0.82rem; color: var(--text-muted); }
.calc-h {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 0 6px;
  padding: 3px 8px;
  border-radius: 8px;
  line-height: 1.35;
  cursor: pointer;
}
.calc-h:hover, .calc-h:focus-visible { background: var(--surface-2); outline: none; }
.calc-h-expr { grid-column: 1; overflow-x: auto; color: var(--text-muted); font-size: 0.86rem; white-space: nowrap; }
.calc-h-expr .katex { font-size: 1em; }
.calc-h-val { grid-column: 1; text-align: right; font: 600 1rem var(--font-mono); color: var(--text); overflow-wrap: anywhere; }
.calc-h-val small { font: 0.7rem var(--font-sans); color: var(--text-muted); }
.calc-h-copy { grid-column: 2; grid-row: 1 / span 2; border: 0; background: none; color: var(--text-muted); padding: 3px; border-radius: 6px; cursor: pointer; opacity: 0; }
.calc-h:hover .calc-h-copy { opacity: 1; }
.calc-h-copy.done { color: var(--good); opacity: 1; }
@media (pointer: coarse) { .calc-h-copy { opacity: 1; } }

/* entrada */
.calc-entry { padding: 10px 12px 6px; border-top: 1px solid var(--border); }
.calc-input {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border-strong);
  border-radius: 9px;
  background: var(--surface);
  color: var(--text);
  font: 1.05rem var(--font-mono);
}
.calc-input:focus { outline: 0; border-color: var(--accent); }
.calc-preview { min-height: 1.4em; margin-top: 4px; text-align: right; font: 600 0.95rem var(--font-mono); color: var(--text-muted); overflow-wrap: anywhere; }
.calc-preview.error { font: 0.8rem var(--font-sans); color: var(--bad); text-align: left; }

.calc-vars { display: flex; flex-wrap: wrap; gap: 4px; padding: 0 12px 6px; }
.calc-vars[hidden] { display: none; }
.calc-var {
  display: inline-flex; align-items: center; gap: 3px;
  padding: 1px 4px 1px 8px; border-radius: 99px; border: 1px solid var(--border); background: var(--surface-2);
  font: 0.76rem var(--font-mono); color: var(--text-muted); cursor: pointer;
}
.calc-var b { color: var(--text); font-weight: 600; }
.calc-var:hover { border-color: var(--accent); }
.calc-var button { border: 0; background: none; color: var(--text-muted); cursor: pointer; padding: 0 4px; font-size: 0.9rem; line-height: 1; }
.calc-var button:hover { color: var(--bad); }

.calc-tools { display: flex; align-items: flex-start; gap: 8px; padding: 0 12px 8px; font-size: 0.8rem; }
.calc-const { flex: 1; min-width: 0; padding: 4px 6px; border: 1px solid var(--border); border-radius: 7px; background: var(--surface); color: var(--text); font: 0.8rem var(--font-sans); }
.calc-help { flex: none; color: var(--text-muted); }
.calc-help summary { cursor: pointer; padding: 4px 2px; }
.calc-help[open] { flex: 1 1 100%; order: 2; }
.calc-tools:has(.calc-help[open]) { flex-wrap: wrap; }
.calc-help p { margin: 4px 0; font-size: 0.78rem; line-height: 1.45; }
.calc-help code { font-size: 0.95em; background: var(--surface-2); padding: 0 3px; border-radius: 3px; }

/* teclado */
.calc-pad { display: grid; grid-template-columns: repeat(5, 1fr); gap: 5px; padding: 8px 12px 12px; border-top: 1px solid var(--border); }
.calc-key {
  height: 34px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface-2);
  color: var(--text);
  font: 0.86rem var(--font-sans);
  cursor: pointer;
}
.calc-key:hover { border-color: var(--accent); }
.calc-key:active { transform: translateY(1px); }
.calc-key.num { background: var(--surface); font: 600 0.98rem var(--font-mono); }
.calc-key.op { font: 600 1rem var(--font-mono); color: var(--accent); }
.calc-key.fn { color: var(--bad); font: 700 0.8rem var(--font-sans); letter-spacing: 0.03em; }
.calc-key.eq { height: auto; background: var(--accent); border-color: var(--accent); color: var(--on-accent); font: 700 1.2rem var(--font-mono); }
@media (max-width: 600px) { .calc-key { height: 40px; } }