:root {
  --menv-accent: #00b894;
  --menv-bg: #ffffff;
  --menv-surface: #f7f9fa;
  --menv-text: #1a202c;
  --menv-text-muted: #8895a7;
  --menv-key-bg: #f1f5f9;
  --menv-key-hover: #e2e8f0;
  --menv-border: #e5e9ee;
}

:root[data-menv-theme="dark"] {
  --menv-bg: #1a1f2b;
  --menv-surface: #232a38;
  --menv-text: #f1f5f9;
  --menv-text-muted: #8895a7;
  --menv-key-bg: #2c3444;
  --menv-key-hover: #384157;
  --menv-border: #333c4d;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: transparent;
}

.menv-calc {
  max-width: 340px;
  margin: 0 auto;
  background: var(--menv-bg);
  border: 1px solid var(--menv-border);
  border-radius: 16px;
  padding: 16px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.menv-calc-display {
  background: var(--menv-surface);
  border-radius: 12px;
  padding: 16px 14px;
  margin-bottom: 14px;
  text-align: right;
  min-height: 64px;
}

.menv-calc-history {
  font-size: 0.8rem;
  color: var(--menv-text-muted);
  min-height: 1.1em;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.menv-calc-value {
  font-size: 2rem;
  font-weight: 600;
  color: var(--menv-text);
  line-height: 1.2;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

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

.menv-key {
  appearance: none;
  border: none;
  border-radius: 10px;
  background: var(--menv-key-bg);
  color: var(--menv-text);
  font-size: 1.1rem;
  font-weight: 500;
  padding: 14px 0;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.05s ease;
}

.menv-key:hover { background: var(--menv-key-hover); }
.menv-key:active { transform: scale(0.96); }

.menv-key-wide { grid-column: span 2; }

.menv-key-fn {
  background: var(--menv-key-bg);
  color: var(--menv-accent);
  font-weight: 600;
}

.menv-key-op {
  background: var(--menv-accent);
  color: #fff;
  font-weight: 600;
}

.menv-key-op:hover { filter: brightness(1.08); }

.menv-key-equals {
  background: var(--menv-accent);
  color: #fff;
  font-weight: 700;
}

.menv-key-equals:hover { filter: brightness(1.08); }

@media (max-width: 360px) {
  .menv-calc { padding: 12px; }
  .menv-calc-value { font-size: 1.6rem; }
  .menv-key { padding: 12px 0; font-size: 1rem; }
}

/* ─── Basic / Scientific switch ─────────────────────────────────────── */
.menv-calc-keys[hidden],
.menv-calc-modes[hidden] { display: none; }

.menv-calc--sci { max-width: 440px; }

.menv-calc-modes {
  display: flex;
  gap: 3px;
  padding: 3px;
  margin-bottom: 12px;
  background: var(--menv-key-bg);
  border-radius: 10px;
}

.menv-calc-modes button {
  flex: 1;
  appearance: none;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--menv-text-muted);
  font: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 7px 0;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.menv-calc-modes button[aria-pressed="true"] {
  background: var(--menv-bg);
  color: var(--menv-accent);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

/* ─── Scientific keys ───────────────────────────────────────────────── */
.menv-calc-keys-sci {
  grid-template-columns: repeat(5, 1fr);
  gap: 6px;
}

.menv-calc-keys-sci .menv-key { padding: 11px 0; font-size: 1rem; }

.menv-calc-keys-sci .menv-key-sci {
  background: var(--menv-surface);
  border: 1px solid var(--menv-border);
  font-size: 0.88rem;
}

.menv-calc-keys-sci .menv-key-sci:hover { background: var(--menv-key-hover); }

.menv-calc-keys-sci .menv-key-active,
.menv-calc-keys-sci .menv-key-active:hover {
  background: var(--menv-accent);
  border-color: var(--menv-accent);
  color: #fff;
}

/* Long expressions scroll instead of being cut off; JS keeps the end in view */
.menv-calc--sci .menv-calc-value {
  font-size: 1.6rem;
  text-overflow: clip;
  overflow-x: auto;
  scrollbar-width: none;
}

.menv-calc--sci .menv-calc-value::-webkit-scrollbar { display: none; }

@media (max-width: 400px) {
  .menv-calc-keys-sci { gap: 5px; }
  .menv-calc-keys-sci .menv-key { padding: 9px 0; font-size: 0.9rem; }
  .menv-calc-keys-sci .menv-key-sci { font-size: 0.8rem; }
}