:root {
    --primary-color: #8c9ff1;
    --secondary-color: #8b5cf6;
    --accent-color: #f59e0b;
    --dark-bg: #0a0e27;
    --darker-bg: #050814;
    --card-bg: #1a1f3a;
    /* --text-primary: #ffffff;     */
    --text-primary: #ffffff;
    --text-secondary: #b8c1ec;
    
    --gradient-1: linear-gradient(0deg, #0a0e27 20%, #8b5cf6 50%); 
        /* --gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%); */
    --gradient-2: linear-gradient(135deg, #00d4ff 20%, #8b5cf6 70%);
    --gradient-3: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --title-color: #0a0e27;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--dark-bg);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

/* Canvas pour le fond animé */
#neuralBackground {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* S'assurer que le contenu est au-dessus du canvas */
.header, .hero, .video-section, .documents-section, .footer {
    position: relative;
    z-index: 1;
}

.container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 2rem;
}

@media (min-width: 1400px) {
    .container {
        padding: 0 3rem;
    }
}

/* Header */
.header {
    background: var(--darker-bg);
    border-bottom: 2px solid var(--primary-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 2rem; /* Espacement entre les deux logos */
    min-height: 65px; /* Hauteur minimale basée sur le logo VLAIO */
}

.logo img {
    height: 30px;
    width: auto;
}

.logovlaio {
    display: flex;
    align-items: center;
    transform: translateY(5px); /* Décalage de 5px vers le bas */
}

.logovlaio img {
    height: 60px;
    width: auto;
}

.vlaio-message {
    display: flex;
    align-items: center;
}

.vlaio-message p {
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-style: italic;
    margin: 0;
}

/* Language-specific display */
.lang-nl-only {
    display: flex;
}

.lang-fr-only {
    display: none;
}

.logo h1 {
    font-size: 1.8rem;
    background: var(--gradient-2);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: bold;
}

nav {
    display: flex;
    gap: 2rem;
    align-items: center;
}

nav a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.3s;
    position: relative;
    padding: 0.5rem 0;
}

nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s;
}

nav a:hover {
    color: var(--primary-color);
}

nav a:hover::after {
    width: 100%;
}

/* Language Switch Toggle */
.language-switch {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.lang-option {
    color: var(--text-secondary);
    font-weight: bold;
    font-size: 0.9rem;
    letter-spacing: 0.5px;
    transition: color 0.3s ease;
}

.lang-option:first-child {
    color: var(--primary-color);
}

/* The switch container */
.switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 26px;
}

/* Hide default HTML checkbox */
.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

/* The slider */
.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-2);
    transition: 0.4s;
    border-radius: 34px;
    border: 2px solid var(--primary-color);
    box-shadow: 0 4px 15px rgba(140, 159, 241, 0.3);
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 2px;
    background-color: white;
    transition: 0.4s;
    border-radius: 50%;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
}

input:checked + .slider {
    background: var(--gradient-2);
    border-color: var(--primary-color);
}

input:checked + .slider:before {
    transform: translateX(24px);
}

.slider:hover {
    box-shadow: 0 6px 20px rgba(140, 159, 241, 0.5);
}

/* Update lang-option colors based on toggle state */
input:checked ~ .lang-option:first-child {
    color: var(--text-secondary);
}

input:checked ~ .lang-option:last-child {
    color: var(--primary-color);
}

/* Fix for sibling selector - we'll handle this with JavaScript instead */

/* Logo Section */
.logo-section {
    padding: 3rem 0 4rem 0;
    text-align: center;
    background: linear-gradient(
        to bottom,
        #ffffff 0%,
        #ffffff 40%,
        #fefeff 45%,
        #fcfdff 50%,
        #fafcff 55%,
        #f8fbff 60%,
        #f6f9ff 65%,
        #f3f7ff 70%,
        #f0f5ff 75%,
        #edf3ff 80%,
        #eaf0ff 85%,
        #e7eeff 90%,
        #e4ebff 95%,
        #e1e9ff 100%
    );
    position: relative;
    z-index: 1;
}

.logo-wrapper {
    margin: 0 auto;
    display: flex;
    justify-content: center;
}

/* Hero Section */
.hero {
    /* padding: 6rem 0; */
    padding: 0 0 2rem 0;
    text-align: center;
    /* Dégradé exponentiel très lisse */
    background: linear-gradient(
        to top,
        #0a0e27 0%,
        #0b0f28 2%,
        #0c1029 4%,
        #0d112b 6%,
        #0e122d 8%,
        #10132f 10%,
        #121532 12%,
        #141735 14%,
        #171939 16%,
        #1a1c3d 18%,
        #1d1f42 20%,
        #202247 22%,
        #24264c 24%,
        #282a52 26%,
        #2c2e58 28%,
        #31335e 30%,
        #363865 32%,
        #3b3e6c 34%,
        #404473 36%,
        #464b7b 38%,
        #4c5283 40%,
        #52598b 42%,
        #586093 44%,
        #5e689c 46%,
        #6470a4 48%,
        #6b78ad 50%,
        #7280b5 52%,
        #7988be 54%,
        #8091c6 56%,
        #879ace 58%,
        #8fa3d6 60%,
        #96acde 62%,
        #9db5e6 64%,
        #a4beee 66%,
        #abc7f5 68%,
        #b3d0fc 70%,
        #bdd8ff 75%,
        #c7deff 80%,
        #d1e4ff 85%,
        #dbe9ff 90%,
        #e5eeff 95%,
        #e1e9ff 100%
    );
    position: relative;
    overflow: hidden;
}

#heroBackground {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* Intro Section */
.intro-section {
    padding: 1rem 0;
    text-align: center;
    background: transparent;
    position: relative;
    z-index: 1;
}

.intro-content {
    max-width: 800px;
    margin: 0 auto;
}

.intro-content p {
    font-size: 1.2rem;
    line-height: 1.8;
    color: var(--text-primary);
}

.intro-project {
    max-width: 800px;
    margin: 3rem auto 0;
    padding: 2rem;
    background: rgb(26, 31, 58);
    border-radius: 15px;
    border: 1px solid var(--primary-color);
    position: relative;
    z-index: 2;
}

.intro-project p {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.project-button {
    display: inline-block;
    color: var(--primary-color);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    border-bottom: 1px solid var(--primary-color);
    transition: all 0.3s;
    padding-bottom: 2px;
}

.project-button:hover {
    color: var(--text-primary);
    border-bottom-color: var(--text-primary);
}

.hero-logo {
    margin-bottom: 3rem;
    display: flex;
    justify-content: center;
}

#hero-logo-svg {
    max-width: 800px;
    width: 100%;
    height: auto;
    filter: drop-shadow(0 10px 30px rgba(0, 0, 0, 0.3));

}

/* Animation des 4 pages du logo dans le hero */
#hero-logo-svg #page1 {
    animation: floatPage1 4s ease-in-out infinite;
    transform-origin: center;
}
#hero-logo-svg #page2 {
    animation: floatPage2 4.3s ease-in-out infinite;
    transform-origin: center;
}
#hero-logo-svg #page3 {
    animation: floatPage3 4.5s ease-in-out infinite;
    transform-origin: center;
}
#hero-logo-svg #page4 {
    animation: floatPage4 4.2s ease-in-out infinite;
    transform-origin: center;
}

@keyframes floatPage1 {
    0%, 100% { transform: translate(0, 0); opacity: 1; }
    25% { transform: translate(-1px, -2px); opacity: 0.95; }
    50% { transform: translate(0, 0); opacity: 1; }
    75% { transform: translate(1px, -1px); opacity: 0.97; }
}

@keyframes floatPage2 {
    0%, 100% { transform: translate(0, 0); opacity: 1; }
    25% { transform: translate(1px, -1px); opacity: 0.96; }
    50% { transform: translate(0, 0); opacity: 1; }
    75% { transform: translate(-1px, -2px); opacity: 0.94; }
}

@keyframes floatPage3 {
    0%, 100% { transform: translate(0, 0); opacity: 1; }
    25% { transform: translate(-1px, -1px); opacity: 0.97; }
    50% { transform: translate(0, 0); opacity: 1; }
    75% { transform: translate(1px, -2px); opacity: 0.95; }
}

@keyframes floatPage4 {
    0%, 100% { transform: translate(0, 0); opacity: 1; }
    25% { transform: translate(1px, -2px); opacity: 0.96; }
    50% { transform: translate(0, 0); opacity: 1; }
    75% { transform: translate(-1px, -1px); opacity: 0.98; }
}

.hero-title {
    font-size: 3rem;
    margin-bottom: 1rem;
    animation: fadeInDown 1s;
    color: var(--title-color);
}

.hero-subtitle {
    font-size: 1.5rem;
    opacity: 0.9;
    animation: fadeInUp 1s;
}

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

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

/* Section Titles */
.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    background: var(--gradient-2);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    position: relative;
    padding: 1.5rem 2rem;
    /* display: inline-block; */
    width: auto;
    margin-left: auto;
    margin-right: auto;
}

.section-title::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    border-radius: 15px;
    z-index: -1;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

/* .section-title::after {
    content: '';
    position: absolute;
    bottom: 0.5rem;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 3px;
    background: var(--primary-color);
} */

/* Video Section */
.video-section {
    padding: 4rem 0;
    text-align: center;
}

/* Hidden elements */
.hidden-video, .hidden-doc {
    display: none;
}

/* Show More Button */
.show-more-btn {
    display: block;
    margin: 3rem auto 0;
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
    font-weight: bold;
    color: var(--text-primary);
    background: var(--gradient-2);
    border: none;
    border-radius: 30px;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 5px 20px rgba(0, 212, 255, 0.3);
}

.show-more-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 212, 255, 0.5);
}

.show-more-btn:active {
    transform: translateY(-1px);
}

.show-more-btn.hide {
    display: none;
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.video-card {
    background: var(--card-bg);
    border-radius: 15px;
    overflow: hidden;
    transition: all 0.3s;
    border: 1px solid transparent;
}

.video-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary-color);
    box-shadow: 0 10px 30px rgba(0, 212, 255, 0.3);
}

.video-wrapper {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
    height: 0;
    overflow: hidden;
    background: var(--darker-bg);
}

.video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.video-card h3 {
    padding: 1rem 1.5rem 0.5rem;
    color: var(--primary-color);
}

.video-card p {
    padding: 0 1.5rem 1.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Documents Section */
.documents-section {
    padding: 4rem 0;
    /* background: var(--darker-bg); */
} 

.category {
    margin-bottom: 4rem;
}

.category-title {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.tiles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.tile {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 2rem;
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.3s;
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
    align-items: center;
    justify-content: center; /* Added for horizontal centering */
    flex-direction: column; /* Added to stack items vertically */
    display: flex; /* Ensure flexbox is applied */
}

.tile::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    
    opacity: 0;
    transition: all 0.5s ease;
    z-index: 0;
}

.tile:hover::before {
    opacity: 0.25;
}

.tile:hover {
    transform: translateY(-10px) scale(1.02);
    border-color: var(--primary-color);
    box-shadow: 0 20px 40px rgba(0, 212, 255, 0.4);
}

.tile-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
    position: relative;
    z-index: 1;
}

.tile img {
    display: block;
    margin: 0 auto;
}

.tile h4 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
    position: relative;
    z-index: 1;
    text-align: center; /* Added for text centering */
}

.tile p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    position: relative;
    z-index: 1;
    text-align: center; /* Added for text centering */
}

/* Contact Section */
.contact-section {
    padding: 3rem 0;
    background: var(--darker-bg);
}

.contact-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.contact-intro {
    font-size: 1.2rem;
    /* margin-bottom: 1rem; */
    margin-top: 3rem;
    color: var(--text-secondary);
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.contact-item {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 15px;
    transition: all 0.3s;
    border: 2px solid transparent;
}

.contact-item:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: 0 10px 30px rgba(140, 159, 241, 0.3);
}

.contact-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.contact-item h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 1.3rem;
}

.contact-item p {
    color: var(--text-secondary);
    margin: 0;
}

.contact-item a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s;
}

.contact-item a:hover {
    color: var(--primary-color);
}

/* Footer */
.footer {
    background: var(--darker-bg);
    padding: 3rem 0;
    text-align: center;
    border-top: 2px solid var(--primary-color);
}

.footer-logos {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: auto auto;
    align-items: center;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-logos > *:nth-child(1) {
    grid-column: 1;
    grid-row: 1;
    justify-self: center;
}

.footer-logos > *:nth-child(2) {
    grid-column: 2;
    grid-row: 1;
    justify-self: center;
}

.footer-logos > *:nth-child(3) {
    grid-column: 3;
    grid-row: 1;
    justify-self: center;
}

.footer-logos > *:nth-child(4) {
    grid-column: 1 / 4;
    grid-row: 2;
    justify-self: center;
    margin-top: 1rem;
}

.footer-logo {
    height: 60px;
    width: auto;
    opacity: 0.8;
    transition: opacity 0.3s;
}

.footer-logos > *:first-child {
    height: 42px;
}

.footer-logo-2 {
    height: 90px;
}

.footer-logo:hover {
    opacity: 1;
}

.footer p {
    color: var(--text-secondary);
    margin: 0.5rem 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        gap: 1rem;
    }

    nav {
        flex-wrap: wrap;
        justify-content: center;
    }

    .language-switch {
        gap: 0.6rem;
    }

    .lang-option {
        font-size: 0.85rem;
    }

    .switch {
        width: 45px;
        height: 24px;
    }

    .slider:before {
        height: 16px;
        width: 16px;
        left: 2px;
    }

    input:checked + .slider:before {
        transform: translateX(21px);
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .video-grid,
    .tiles-grid {
        grid-template-columns: 1fr;
    }

    .footer-logos {
        grid-template-columns: 1fr;
        grid-template-rows: auto;
        gap: 2rem;
    }

    .footer-logos > *:nth-child(1) {
        grid-column: 1;
        grid-row: 1;
    }

    .footer-logos > *:nth-child(2) {
        grid-column: 1;
        grid-row: 2;
    }

    .footer-logos > *:nth-child(3) {
        grid-column: 1;
        grid-row: 3;
    }

    .footer-logos > *:nth-child(4) {
        grid-column: 1;
        grid-row: 4;
        margin-top: 0;
    }

    .footer-logos > *:first-child {
        height: 40px;
    }

    .footer-logo {
        height: 50px;
    }

    .footer-logo-2 {
        height: 80px;
    }
}

/* Animations and Effects */
@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

.tile-icon {
    animation: float 3s ease-in-out infinite;
}

/* Hidden Section - AI Boom */
#decision-tree {
    display: none;
}

/* Hide AI Boom link in header navigation */
nav a[href="#decision-tree"] {
    display: none;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--darker-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}

/* Fancybox YouTube Player Styling */
.fancybox-youtube-player .fancybox__content {
    padding: 0 !important;
    background: #000 !important;
    width: 90vw !important;
    max-width: 1280px !important;
    height: 0 !important;
    padding-bottom: 56.25% !important; /* 16:9 aspect ratio */
    position: relative !important;
}

.fancybox-youtube-player .fancybox__content > div {
    position: absolute !important;
    top: 0 !important;
    left: 0 !important;
    width: 100% !important;
    height: 100% !important;
}

.fancybox-youtube-player iframe {
    position: absolute !important;
    top: 0 !important;
    left: 0 !important;
    width: 100% !important;
    height: 100% !important;
    border: none !important;
}