/* 入场动画样式 */
.welcome-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    animation: fadeOut 0.8s ease-in-out 2.5s forwards;
}

.welcome-content {
    text-align: center;
    color: white;
}

.welcome-text {
    font-size: clamp(2rem, 6vw, 4rem);
    font-weight: 700;
    margin-bottom: 2rem;
    opacity: 0;
    transform: translateY(30px);
    animation: slideInUp 1s ease-out 0.5s forwards;
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.welcome-loader {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 2rem;
}

.loader-dot {
    width: 12px;
    height: 12px;
    background-color: rgba(255, 255, 255, 0.8);
    border-radius: 50%;
    animation: bounce 1.4s ease-in-out infinite both;
}

.loader-dot:nth-child(1) { animation-delay: -0.32s; }
.loader-dot:nth-child(2) { animation-delay: -0.16s; }
.loader-dot:nth-child(3) { animation-delay: 0s; }

@keyframes slideInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeOut {
    to {
        opacity: 0;
        visibility: hidden;
    }
}

@keyframes bounce {
    0%, 80%, 100% {
        transform: scale(0);
    }
    40% {
        transform: scale(1);
    }
}