:root {
    --primary-color: #ffffff;
    --secondary-color: #aaaaaa;
    --background-color: #121212;
    --card-background: #1e1e1e;
    --hover-color: #2a2a2a;
}

body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--background-color);
    color: var(--primary-color);
    margin: 0;
    line-height: 1.6;
}



#cover-page {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 999;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: white;
    overflow: hidden;
    width: 100%;
    height: 100%;
    background-color: var(--background-color); /* Or a semi-transparent black */
}

#bg-video {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transform: translate(-50%, -50%);
    z-index: 1;
}

.hero-text {
    position: relative; /* To ensure z-index works */
    z-index: 2;
    padding: 20px;
    background-color: rgba(0, 0, 0, 0.5); /* Semi-transparent background for text */
    border-radius: 8px;
}

.hero-text h1 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero-text p {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto 20px auto;
}

.enter-button {
    background-color: var(--primary-color);
    color: var(--background-color);
    border: none;
    padding: 15px 30px;
    font-size: 1.2rem;
    cursor: pointer;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.enter-button:hover {
    background-color: var(--secondary-color);
}

.hidden {
    display: none !important;
}

#main-header {
    background-color: var(--card-background);
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.header-logo-main {
    max-width: 75px;
    height: auto;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    padding: 20px;
    max-width: 900px;
    margin: 20px auto;
}

.project-card {
    background-color: var(--card-background);
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.3s ease, background-color 0.3s ease;
    aspect-ratio: 1 / 1; /* Maintain a square shape */
    display: flex;
    justify-content: center;
    align-items: center;
}

.project-card:hover {
    transform: scale(1.03);
    background-color: var(--hover-color);
}

.card-content {
    display: flex;
    flex-direction: column; /* Stack icon and title vertically */
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 20px;
}

.card-icon {
    width: 48px;  /* Icon size */
    height: 48px;
    margin: 0 0 15px 0; /* Margin below icon */
    filter: invert(1); /* Makes icon white */
}

.card-content h3 {
    margin: 0;
    font-size: 1.2rem; /* Reduced font size */
    font-weight: 400;
}

.card-subtitle {
    font-size: 0.9rem;
    color: var(--secondary-color);
    margin-top: 5px;
}

/* Modal styles remain the same */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.8);
    justify-content: center; /* Center content horizontally */
    align-items: center;   /* Center content vertically */
}

#image-modal .close-button {
    position: absolute;
    top: 15px;
    right: 35px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    transition: 0.3s;
    cursor: pointer;
}

#image-modal .close-button:hover,
#image-modal .close-button:focus {
    color: #bbb;
    text-decoration: none;
    cursor: pointer;
}

#video-modal .close-button {
    position: absolute;
    top: 15px;
    right: 35px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    transition: 0.3s;
    cursor: pointer;
}

#video-modal .close-button:hover,
#video-modal .close-button:focus {
    color: #bbb;
    text-decoration: none;
    cursor: pointer;
}

.modal-video-content {
    margin: auto;
    display: block;
    width: 80%;
    max-width: 900px;
    max-height: 90vh;
    object-fit: contain;
}


.modal-image-content {
    margin: auto;
    display: block;
    width: 80%;
    max-width: 700px;
    max-height: 90vh;
    object-fit: contain;
}

.modal-content {
    background-color: var(--card-background);
    margin: 5% auto;
    padding: 40px;
    border-radius: 8px;
    width: 80%;
    max-width: 900px;
    position: relative;
    animation: slide-down 0.5s ease-out;
}

@keyframes slide-down {
    from { transform: translateY(-50px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.close-button {
    color: var(--secondary-color);
    position: absolute;
    top: 20px;
    right: 30px;
    font-size: 30px;
    font-weight: bold;
    cursor: pointer;
}

.close-button:hover,
.close-button:focus {
    color: var(--primary-color);
}

#modal-body h2 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

#modal-body p {
    font-size: 1.1rem;
    color: var(--secondary-color);
}

.modal-images {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
    margin-top: 30px;
}

.modal-images img {
    width: 100%;
    border-radius: 4px;
    object-fit: cover;
}

.key-indicators {
    margin-top: 20px;
    list-style: none;
    padding: 0;
}

.key-indicators li {
    background-color: var(--background-color);
    padding: 10px;
    border-radius: 4px;
    margin-bottom: 8px;
    font-size: 1rem;
}

.modal-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 20px;
}

.pdf-export-button,
.video-button {
    display: inline-block;
    background-color: #007bff; /* Unified blue color */
    color: white;
    padding: 10px 20px;
    border-radius: 5px;
    text-decoration: none;
    font-size: 1rem;
    transition: background-color 0.3s ease;
    cursor: pointer;
    border: none;
    text-align: center;
}

.pdf-export-button:hover,
.video-button:hover {
    background-color: #0056b3;
}

footer {
    background-color: var(--card-background);
    color: var(--secondary-color);
    text-align: center;
    padding: 20px;
    margin-top: 40px;
    font-size: 0.9rem;
}

footer a {
    color: var(--secondary-color);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .hero-text h1 {
        font-size: 2rem;
    }
    .modal-content {
        width: 90%;
        padding: 20px;
    }
    #modal-body h2 {
        font-size: 2rem;
    }
    .projects-grid {
        gap: 10px;
        padding: 10px;
    }
    .card-content {
        padding: 10px;
    }
    .card-icon {
        width: 40px;
        height: 40px;
        margin-bottom: 10px;
    }
    .card-content h3 {
        font-size: 0.9rem;
    }
    .card-subtitle {
        font-size: 0.75rem;
    }
}

.methodology-content {
    max-width: 900px;
    margin: 40px auto;
    padding: 20px;
    background-color: var(--card-background);
    border-radius: 8px;
}

.methodology-content h1 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 2.25rem;
    color: var(--primary-color);
    margin-bottom: 20px;
    text-align: center;
}

.methodology-content h2 {
    font-size: 1.62rem;
    color: var(--primary-color);
    margin-top: 30px;
    margin-bottom: 15px;
}

.methodology-content h3 {
    font-size: 1.35rem;
    color: var(--primary-color);
    margin-top: 25px;
    margin-bottom: 10px;
}

.methodology-content p,
.methodology-content li {
    font-size: 0.99rem;
    line-height: 1.7;
    color: var(--secondary-color);
    margin-bottom: 15px;
    text-align: justify;
}

#logo-link-methodology {
    display: block;
    width: fit-content;
    margin: 0 auto;
    padding: 10px 0;
}

.back-to-mosaic-container {
    text-align: center;
    margin: 20px 0;
}

.btn-back-to-mosaic {
    display: inline-block;
    background-color: var(--primary-color);
    color: var(--background-color);
    padding: 12px 25px;
    border-radius: 5px;
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.btn-back-to-mosaic:hover {
    background-color: var(--hover-color);
    color: var(--primary-color);
}

/* Collapsible Sections */
.collapsible {
    cursor: pointer;
    user-select: none;
}

.collapsible::after {
    content: '\25B6'; /* Right-pointing triangle */
    font-size: 0.8em;
    color: var(--primary-color);
    float: right;
    margin-left: 5px;
    transition: transform 0.2s ease-in-out;
}

.collapsible.active::after {
    transform: rotate(90deg); /* Down-pointing triangle */
}

.collapsible-content {
    padding: 0 18px;
    display: none;
    overflow: hidden;
    background-color: var(--card-background);
}