/* 3D穿越加载动画 - 星际穿越风格 */
.blackhole-loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #000000;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 99999;
    transition: opacity 1.5s ease-out, visibility 1.5s ease-out;
    perspective: 1000px;
}

.blackhole-loader.hidden {
    opacity: 0;
    visibility: hidden;
}

/* 星空背景 - 3D穿越效果 */
.starfield {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(ellipse at center, #000022 0%, #000011 50%, #000000 100%);
    overflow: hidden;
    z-index: 1;
    transform-style: preserve-3d;
}

.star {
    position: absolute;
    background: white;
    border-radius: 50%;
    transform-origin: center;
}

/* LOGO显示区域 */
.logo-reveal {
    position: absolute;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: scale(0.5) translateZ(0);
    transition: all 2s ease-out;
    z-index: 20;
    pointer-events: none;
}

.logo-reveal.visible {
    opacity: 1;
    transform: scale(1);
}

.logo-reveal-img {
    width: 120px;
    height: 120px;
    object-fit: contain;
    filter: drop-shadow(0 0 40px rgba(0, 122, 255, 0.8));
    animation: logoGlow 2s ease-in-out infinite;
}

.logo-reveal-text {
    font-size: 28px;
    font-weight: 700;
    color: #ffffff;
    letter-spacing: 8px;
    margin-top: 20px;
    text-transform: uppercase;
    text-shadow: 0 0 20px rgba(0, 122, 255, 0.8);
    animation: logoTextFade 2s ease-in-out infinite;
}

.logo-reveal-sub {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.6);
    letter-spacing: 4px;
    text-transform: uppercase;
    margin-top: 5px;
}

/* 动画关键帧 - 3D穿越效果 */
@keyframes star3DFly {
    0% {
        transform: translate3d(var(--startX), var(--startY), var(--startZ)) scale(var(--startScale));
        opacity: 0;
    }
    5% {
        opacity: 1;
    }
    95% {
        opacity: 1;
    }
    100% {
        transform: translate3d(var(--endX), var(--endY), var(--endZ)) scale(var(--endScale));
        opacity: 0;
    }
}

@keyframes logoGlow {
    0%, 100% {
        filter: drop-shadow(0 0 40px rgba(0, 122, 255, 0.8));
    }
    50% {
        filter: drop-shadow(0 0 60px rgba(138, 43, 226, 1));
    }
}

@keyframes logoTextFade {
    0%, 100% {
        opacity: 0.8;
    }
    50% {
        opacity: 1;
    }
}

/* 响应式调整 */
@media (max-width: 768px) {
    .logo-reveal-img {
        width: 80px;
        height: 80px;
    }
    
    .logo-reveal-text {
        font-size: 20px;
        letter-spacing: 4px;
    }
    
    .logo-reveal-sub {
        font-size: 10px;
        letter-spacing: 2px;
    }
}