/* ═══════════════════════════════════════════════════════
   KEYPAD.CSS — Full Symbol Keypad
═══════════════════════════════════════════════════════ */

/* ── KEYPAD CONTAINER ── */
.codepad-container {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.10);
  border-radius: var(--r-lg);
  padding: 18px 16px 14px;
  margin-bottom: 10px;
  animation: fadePad 0.2s ease;
}

@keyframes fadePad {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── PAD GRID ── */
.full-pad-grid {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* ── PAD SECTION ── */
.pad-section { }

.pad-section-title {
  font-size: 10px;
  font-weight: 700;
  color: rgba(255,255,255,0.40);
  text-transform: uppercase;
  letter-spacing: 1.2px;
  margin-bottom: 8px;
  padding-left: 2px;
}

.pad-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

/* ── PAD BUTTONS ── */
.padBtn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  height: 38px;
  padding: 0 12px;
  background: rgba(255,255,255,0.09);
  border: 1px solid rgba(255,255,255,0.13);
  border-radius: var(--r-md);
  color: rgba(255,255,255,0.90);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--t-fast), border-color var(--t-fast),
              color var(--t-fast), transform var(--t-fast), box-shadow var(--t-fast);
  font-family: 'Roboto', 'Georgia', serif;
  white-space: nowrap;
  letter-spacing: 0.2px;
  user-select: none;
}

.padBtn:hover {
  background: rgba(219,63,89,0.22);
  border-color: rgba(219,63,89,0.45);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 3px 10px rgba(219,63,89,0.25);
}

.padBtn:active {
  transform: translateY(0) scale(0.96);
  box-shadow: none;
}

/* Operator variant (÷, ×, +, −) */
.padBtn.op {
  background: rgba(219,63,89,0.15);
  border-color: rgba(219,63,89,0.30);
  color: rgba(255,180,180,0.95);
  font-size: 16px;
}

.padBtn.op:hover {
  background: rgba(219,63,89,0.35);
  border-color: rgba(219,63,89,0.60);
  color: #fff;
}

/* Greek letters variant */
.padBtn.greek {
  font-style: italic;
  font-size: 16px;
  font-family: 'Georgia', 'Times New Roman', serif;
  min-width: 40px;
  color: rgba(180,200,255,0.92);
  background: rgba(99,102,241,0.12);
  border-color: rgba(99,102,241,0.22);
}

.padBtn.greek:hover {
  background: rgba(99,102,241,0.28);
  border-color: rgba(99,102,241,0.50);
  color: #fff;
  box-shadow: 0 3px 10px rgba(99,102,241,0.25);
}

/* Divider between pad sections */
.pad-divider {
  height: 1px;
  background: rgba(255,255,255,0.08);
  margin: 2px 0;
}

/* ── MINI SYMBOL PAD (above input, always visible) ── */
.mini-sym-pad {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 10px 4px 6px;
}

.symBtn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 38px;
  height: 32px;
  padding: 0 10px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--r-sm);
  color: rgba(255,255,255,0.85);
  font-size: 13px;
  font-family: 'Roboto', monospace;
  cursor: pointer;
  transition: all var(--t-fast);
  user-select: none;
}

.symBtn:hover {
  background: var(--red);
  border-color: var(--red);
  color: #fff;
  transform: translateY(-1px);
}

/* ── TABS FOR KEYPAD CATEGORIES ── */
.pad-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 14px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  padding-bottom: 10px;
}

.pad-tab {
  background: none;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--r-sm);
  color: rgba(255,255,255,0.55);
  font-size: 12px;
  font-weight: 600;
  padding: 5px 12px;
  cursor: pointer;
  transition: all var(--t-fast);
  font-family: 'Rubik', sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.pad-tab:hover {
  background: rgba(255,255,255,0.08);
  color: rgba(255,255,255,0.85);
}

.pad-tab.active {
  background: var(--red);
  border-color: var(--red);
  color: #fff;
  box-shadow: 0 2px 8px rgba(219,63,89,0.30);
}

/* ── RESPONSIVE ── */
@media (max-width: 640px) {
  .codepad-container { padding: 14px 10px 10px; }
  .padBtn { min-width: 36px; height: 34px; font-size: 13px; padding: 0 9px; }
  .pad-section-title { font-size: 9px; }
}