/* 封面页样式 */

.cover-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-size: cover;
    background-position: center;
    position: relative;
    overflow: hidden;
}

.cover-container::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: backgroundMove 20s linear infinite;
}

@keyframes backgroundMove {
    0% {
        transform: translate(0, 0);
    }
    100% {
        transform: translate(50px, 50px);
    }
}

.cover-content {
    text-align: center;
    color: white;
    z-index: 1;
    animation: fadeInUp 1s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.blog-title {
    font-size: 64px;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
    letter-spacing: 4px;
}

.blog-subtitle {
    font-size: 24px;
    margin-bottom: var(--spacing-xl);
    opacity: 0.95;
    font-weight: 300;
}

.enter-btn {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-xl);
    background-color: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50px;
    color: white;
    font-size: 18px;
    font-weight: 600;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.enter-btn:hover {
    background-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
    color: white;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .blog-title {
        font-size: 42px;
        letter-spacing: 2px;
    }

    .blog-subtitle {
        font-size: 18px;
    }

    .enter-btn {
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: 16px;
    }
}