/* MÀN HÌNH TINH THỂ LỎNG LCD FSTN DOT-MATRIX CHUẨN CASIO FX-580VNX */
.casio-lcd-screen, .menu-item-btn, #lcdMenuOverlay, #lcdTableOverlay {
  pointer-events: auto !important;
}
.menu-item-btn:hover {
  background-color: rgba(11, 20, 12, 0.2) !important;
}
.menu-item-btn:active {
  background-color: #0b140c !important;
  color: #a4b79e !important;
}

.casio-lcd-screen {
  background-color: #a4b79e;
  background-image: radial-gradient(circle, rgba(11, 20, 12, 0.12) 1px, transparent 1px);
  background-size: 2.5px 2.5px;
  box-shadow: 
    inset 0 3px 6px rgba(0, 0, 0, 0.45),
    inset 0 0 12px rgba(0, 0, 0, 0.12),
    inset 0 -1px 2px rgba(255, 255, 255, 0.35);
  border: 1.5px solid #6c7c68;
  color: #0b140c;
  font-family: 'Consolas', 'Courier New', monospace;
}

.casio-badge {
  background: #0b140c;
  color: #a4b79e;
  padding: 0 2.5px;
  border-radius: 1.5px;
  font-size: 7.5px;
  font-weight: 900;
  line-height: 1;
}

.casio-box-badge {
  border: 1px solid #0b140c;
  padding: 0 2px;
  font-size: 8px;
  font-weight: 900;
  line-height: 1;
}

/* Con trỏ nhấp nháy chuẩn Casio LCD */
.casio-cursor {
  display: inline-block;
  margin-left: 1px;
  animation: casioBlink 0.9s infinite step-start;
  color: #0b140c;
  font-weight: 900;
}

@keyframes casioBlink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* Phân số 2 tầng tự nhiên Casio Natural Display */
.casio-frac-stack {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  vertical-align: middle;
  margin: 0 2px;
  line-height: 1;
}

.casio-frac-num {
  border-bottom: 1.5px solid #0b140c;
  padding: 0 2px 1px 2px;
  font-size: 11px;
  font-weight: 900;
  line-height: 1;
}

.casio-frac-den {
  padding: 1px 2px 0 2px;
  font-size: 11px;
  font-weight: 900;
  line-height: 1;
}

/* Nút cảm ứng trên ảnh thật */
.btn-hotspot {
  position: absolute;
  pointer-events: auto !important;
  z-index: 35;
  background: rgba(255, 255, 255, 0.01);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.08s ease;
  outline: none;
}
.btn-hotspot:hover {
  background: rgba(99, 102, 241, 0.22);
  border-color: rgba(129, 140, 248, 0.85);
  box-shadow: 0 0 12px rgba(99, 102, 241, 0.55);
}
.btn-hotspot:active,
.btn-hotspot.key-active-flash {
  background: rgba(245, 158, 11, 0.48) !important;
  border-color: #fbbf24 !important;
  box-shadow: 0 0 18px rgba(245, 158, 11, 0.95) !important;
  transform: scale(0.94);
}
.show-hotspot-outlines .btn-hotspot {
  border-color: rgba(56, 189, 248, 0.65);
  background: rgba(56, 189, 248, 0.09);
}
.casio-vbtn.key-active-flash {
  outline: 3px solid #fbbf24 !important;
  transform: scale(0.95);
}

/* ĐẢM BẢO DÒNG KẾT QUẢ VÀ PHÂN SỐ 2 TẦNG KHÔNG BỊ CHE KHUẤT */
.casio-lcd-screen {
  padding: 3px 6px 3px 6px !important;
  box-sizing: border-box !important;
  display: flex !important;
  flex-direction: column !important;
  justify-content: space-between !important;
  overflow: hidden !important;
}

.casio-expr-line {
  flex: 1 1 auto !important;
  min-height: 16px !important;
  max-height: 44px !important;
  overflow-y: auto !important;
  line-height: 1.15 !important;
  word-break: break-all !important;
  display: flex !important;
  align-items: center !important;
  flex-wrap: wrap !important;
}

.casio-result-line {
  flex-shrink: 0 !important;
  min-height: 20px !important;
  margin-top: auto !important;
  padding-bottom: 2px !important;
  padding-right: 5px !important;
  line-height: 1.1 !important;
  display: flex !important;
  align-items: flex-end !important;
  justify-content: flex-end !important;
  overflow: visible !important;
}

.casio-result-line span,
.casio-result-line div {
  line-height: 1.1 !important;
}