#preloader {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 9999;
    width: 100vw;
    height: 100vh;
    background: linear-gradient(135deg, 
        #4db7c7 0%, 
        #45aac2 10%,
        #3c96cc 20%, 
        #358bc8 30%,
        #2878cb 40%, 
        #216fc9 50%,
        #1965c8 60%,
        #165ec9 70%,
        #1965c8 80%,
        #2878cb 90%,
        #4db7c7 100%
    );
    background-size: 400% 400%;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    animation: gradientBG 6s ease infinite;
}

.dark #preloader {
    background: linear-gradient(135deg, 
        #344c8c 0%,
        #2f4578 10%,
        #26344a 20%,
        #1f2f45 30%,
        #142a73 40%,
        #0c2569 50%,
        #081069 60%,
        #060d5f 70%,
        #081069 80%,
        #142a73 90%,
        #344c8c 100%
    );
    background-size: 400% 400%;
}

/* Cortinas */
.panel {
    position: absolute;
    top: 0;
    width: 50vw;
    height: 100vh;
    background: inherit;
    z-index: 3;
    transition: transform 0.8s ease-in-out;
}

.dark .panel {
    background: inherit;
}

.preloader-logo {
    position: relative;
    z-index: 2;
}

.preloader-logo img {
    width: 150px;
    height: auto;
    opacity: 0;
}

.panel.left {
    left: 0;
    transform: translateX(0);
}

.panel.right {
    right: 0;
    transform: translateX(0);
}

/* Gracias page styles */
.gracias-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2rem;
    background: linear-gradient(135deg, #f0f4f8 0%, #d5f1f6 100%);
}

.dark .gracias-container {
    background: linear-gradient(135deg, #1e2122 0%, #2d3235 100%);
    color: white;
}

.logo-gracias {
    width: 200px;
    height: auto;
    margin-bottom: 2rem;
}

.gracias-container h1 {
    font-size: 2.5rem;
    color: #1f2937;
    margin-bottom: 1rem;
}

.dark .gracias-container h1 {
    color: #fff;
}

.gracias-container p {
    font-size: 1.2rem;
    color: #4b5563;
    margin: 0.5rem 0;
    max-width: 600px;
}

.dark .gracias-container p {
    color: #d1d5db;
}

.volver-btn {
    display: inline-block;
    margin-top: 2rem;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, #3b82f6, #2563eb);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.volver-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

.dark .volver-btn {
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
}