.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #fff;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 10000;
    transition: opacity 0.5s ease-out;
}

.loading-screen.hidden {
    opacity: 0;
    pointer-events: none;
}

.loading-logo {
    width: 120px;
    height: auto;
    margin: 30px;
}

.loading-tip {
    font-size: 1.1rem;
    opacity: 0;
    margin: 30px;
    color: #333333;
    min-height: 60px;
    text-align: center;
    transition: opacity 0.3s;
}

.loading-progress {
    width: 200px;
    height: 4px;
    background: #e0e0e0;
    border-radius: 2px;
    margin: 20px auto;
    overflow: hidden;
}

.loading-progress-bar {
    height: 100%;
    background: #000000;
    border-radius: 2px;
    transition: width 0.3s ease;
    width: 0%;
}