/* Glassmorphism utility */
.glass-card {
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
}

/* Hide spin buttons on number inputs */
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}
input[type="number"] {
    -moz-appearance: textfield;
}

/* Tip button active state */
.tip-btn.active-tip {
    background-color: #2B32A8; /* Dark Blue */
    color: white;
    border-color: #2B32A8;
    box-shadow: 0 4px 14px 0 rgba(43, 50, 168, 0.39);
    transform: translateY(-2px);
}

/* Smooth transition for input changes */
input {
    transition: all 0.3s ease;
}