/* Professional Preloader Styles */
.preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: #ffffff; /* Clean white background */
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: opacity 0.75s ease, visibility 0.75s ease;
    visibility: visible;
    opacity: 1;
}

.preloader.fade-out {
    opacity: 0;
    visibility: hidden;
}

.preloader-content {
    text-align: center;
}

.preloader-logo {
    font-family: 'Montserrat', Arial, sans-serif;
    font-size: 2.5rem;
    font-weight: 700;
    color: #003366; /* Corporate dark blue */
    margin-bottom: 10px;
    animation: pulse 2s infinite ease-in-out;
}

.preloader-subtitle {
    font-family: 'Heiti SC', 'Microsoft YaHei', sans-serif; /* Common Chinese fonts */
    font-size: 1.5rem;
    color: #00509e; /* Primary blue */
    margin-bottom: 30px;
    animation: pulse 2s infinite ease-in-out;
    animation-delay: 0.2s;
}

.loading-bar-container {
    width: 250px;
    height: 8px;
    background-color: #e0e0e0;
    border-radius: 4px;
    overflow: hidden;
    margin: 0 auto;
}

.loading-bar {
    width: 100%;
    height: 100%;
    background-color: #0779e4; /* Bright blue */
    border-radius: 4px;
    animation: loading 2s infinite linear;
    transform-origin: left;
}

/* Animations */
@keyframes pulse {
    0% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.05);
        opacity: 0.7;
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

@keyframes loading {
    0% {
        transform: translateX(-100%);
    }
    50% {
        transform: translateX(0%);
    }
    100% {
        transform: translateX(100%);
    }
}