/* Forge — Math Calculator (tool-specific).
   Colors, fonts, buttons-in-general, and the page-intro header block all
   come from /assets/global.css. This file only lays out the calculator
   itself. */

.calculator {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 8px 20px 56px;
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 16px;
  align-items: start;
}

/* ---- History panel ------------------------------------------------------ */
.calc-history {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  max-height: 520px;
  display: flex;
  flex-direction: column;
}
.calc-history-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}
.calc-history-clear {
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-size: 0.78rem;
  cursor: pointer;
  padding: 2px 4px;
}
.calc-history-clear:hover { color: var(--ember); }

.calc-history-list {
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.calc-history-empty { color: var(--text-dim); font-size: 0.82rem; }
.calc-history-item {
  width: 100%;
  text-align: left;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 10px;
  cursor: pointer;
  color: var(--text);
}
.calc-history-item:hover { border-color: var(--ember); }
.calc-history-expr {
  display: block;
  font-family: var(--font-display);
  font-size: 0.78rem;
  color: var(--text-dim);
  word-break: break-all;
}
.calc-history-result {
  display: block;
  font-family: var(--font-display);
  font-size: 0.95rem;
  color: var(--ember);
  margin-top: 2px;
}

/* ---- Display -------------------------------------------------------------- */
.calc-body { display: flex; flex-direction: column; gap: 14px; }
.calc-display {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
}
.calc-display-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}
.calc-mode-toggle {
  font-family: var(--font-display);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  background: var(--bg-raised-hi);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 3px 8px;
  cursor: pointer;
  color: var(--steel-bright);
}
.calc-mode-toggle:hover { border-color: var(--ember); color: var(--ember); }
.calc-mem-indicator {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--ember);
  border: 1px solid var(--ember);
  border-radius: 4px;
  padding: 1px 6px;
  font-size: 0.72rem;
}
.calc-expression {
  min-height: 1.4em;
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--text-dim);
  text-align: right;
  word-break: break-all;
}
.calc-result {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 5vw, 2.6rem);
  font-weight: 700;
  text-align: right;
  word-break: break-all;
}
.calc-result.is-error { color: var(--danger); font-size: 1.6rem; }

/* ---- Keypad ---------------------------------------------------------------- */
.calc-keys-row {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 8px;
  margin-bottom: 8px;
}
.calc-keys-mem { grid-template-columns: repeat(4, 1fr); max-width: 260px; }

.calc-keys-main {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.calc-keys button {
  font-family: var(--font-display);
  font-size: 0.95rem;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 6px;
  cursor: pointer;
  color: var(--text);
  transition: border-color 0.12s ease, background 0.12s ease;
}
.calc-keys-sci button,
.calc-keys-mem button {
  font-size: 0.8rem;
  padding: 9px 4px;
  color: var(--steel-bright);
}
.calc-keys button:hover { border-color: var(--ember); color: var(--ember); }
.calc-keys button:active { background: var(--bg-raised-hi); }

.key-op { color: var(--ember); }
.key-fn { color: var(--steel-bright); }
.key-equals {
  background: var(--molten-gradient);
  border-color: var(--molten-3);
  color: #1a0f06;
  font-weight: 700;
}
.key-equals:hover { filter: brightness(1.1); }
.key-equals:active { filter: brightness(0.95); }

/* ---- Responsive ------------------------------------------------------------ */
@media (max-width: 720px) {
  .calculator { grid-template-columns: 1fr; }
  .calc-history { order: 2; max-height: 260px; }
  .calc-body { order: 1; }
  .calc-keys-row { grid-template-columns: repeat(3, 1fr); }
  .calc-keys-mem { grid-template-columns: repeat(4, 1fr); max-width: none; }
}