/* Button styles */
.date-nav button { 
    font-size: 1.75rem; 
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(59, 130, 246, 0.2); 
    cursor: pointer; 
    color: #3b82f6; 
    padding: 0;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 12px;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    font-weight: 700;
}

.date-nav button span {
    position: relative;
    z-index: 2;
    transition: transform 0.3s ease;
}

.date-nav button::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    opacity: 0;
    transition: opacity 0.3s ease;
    border-radius: 10px;
}

.date-nav button:hover {
    transform: scale(1.1);
    border-color: transparent;
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.3);
}

.date-nav button:hover::before {
    opacity: 1;
}

.date-nav button:hover span {
    color: white;
    transform: scale(1.1);
}

.date-nav button:active {
    transform: scale(0.95);
}

.date-nav button:disabled { 
    color: #cbd5e1; 
    cursor: not-allowed;
    transform: none;
    border-color: rgba(203, 213, 225, 0.3);
    background: rgba(255, 255, 255, 0.5);
}

.date-nav button:disabled::before {
    display: none;
}

.date-nav button:disabled:hover {
    transform: none;
    box-shadow: none;
}