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

body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(135deg, #0f1419 0%, #1a2332 50%, #0d1117 100%);
    color: #ffffff;
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* Animation de fond avec particules */
.background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: radial-gradient(circle at 20% 50%, rgba(59, 130, 246, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(147, 197, 253, 0.08) 0%, transparent 50%),
                radial-gradient(circle at 40% 80%, rgba(96, 165, 250, 0.06) 0%, transparent 50%);
    animation: backgroundPulse 8s ease-in-out infinite alternate;
}

@keyframes backgroundPulse {
    0% {
        opacity: 0.3;
        transform: scale(1);
    }
    100% {
        opacity: 0.6;
        transform: scale(1.05);
    }
}

/* Particules flottantes */
.background-animation::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(2px 2px at 20px 30px, rgba(59, 130, 246, 0.3), transparent),
        radial-gradient(2px 2px at 40px 70px, rgba(147, 197, 253, 0.2), transparent),
        radial-gradient(1px 1px at 90px 40px, rgba(96, 165, 250, 0.4), transparent),
        radial-gradient(1px 1px at 130px 80px, rgba(59, 130, 246, 0.2), transparent),
        radial-gradient(2px 2px at 160px 30px, rgba(147, 197, 253, 0.3), transparent);
    background-repeat: repeat;
    background-size: 200px 100px;
    animation: particlesFloat 20s linear infinite;
}

@keyframes particlesFloat {
    0% {
        transform: translate(0, 0);
    }
    100% {
        transform: translate(-200px, -100px);
    }
}

/* Header */
header {
    position: relative;
    z-index: 10;
    padding: 1rem 0;
    text-align: center;
}

.logo-container {
    display: inline-block;
    position: relative;
    height: 40vh;
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo {
    height: 35vh;
    min-height: 280px;
    width: auto;
    filter: drop-shadow(0 0 30px rgba(59, 130, 246, 0.6));
    transition: all 0.3s ease;
    opacity: 0;
    transform: scale(0.5);
}

.logo.intro-complete {
    opacity: 1;
    transform: scale(1);
    animation: logoGentleGlow 4s ease-in-out infinite alternate;
}

.logo:hover {
    filter: drop-shadow(0 0 40px rgba(59, 130, 246, 0.8));
    transform: scale(1.02);
}

@keyframes logoGentleGlow {
    0% {
        filter: drop-shadow(0 0 30px rgba(59, 130, 246, 0.6));
    }
    100% {
        filter: drop-shadow(0 0 35px rgba(59, 130, 246, 0.8));
    }
}

/* Animation d'introduction du logo avec effet ADN */
.dna-fragment {
    position: absolute;
    width: 60px;
    height: 60px;
    background: rgba(59, 130, 246, 0.8);
    border-radius: 50%;
    opacity: 0;
    transform: scale(0);
}

.dna-fragment::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.6), transparent);
    top: 50%;
    left: 0;
    transform: translateY(-50%);
}

.dna-fragment::after {
    content: '';
    position: absolute;
    width: 2px;
    height: 100%;
    background: linear-gradient(0deg, transparent, rgba(59, 130, 246, 0.6), transparent);
    left: 50%;
    top: 0;
    transform: translateX(-50%);
}

@keyframes dnaFragmentAppear {
    0% {
        opacity: 0;
        transform: scale(0) rotate(0deg);
    }
    50% {
        opacity: 1;
        transform: scale(1.2) rotate(180deg);
    }
    100% {
        opacity: 1;
        transform: scale(1) rotate(360deg);
    }
}

@keyframes dnaFragmentMove {
    0% {
        transform: scale(1) rotate(360deg);
    }
    100% {
        transform: scale(0.1) rotate(720deg);
    }
}

/* Contenu principal */
.main-content {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(60vh - 100px);
    position: relative;
    z-index: 10;
}

.hero-section {
    text-align: center;
    max-width: 800px;
    padding: 0 2rem;
}

.main-title {
    font-size: 4.5rem;
    font-weight: 300;
    letter-spacing: 0.1em;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #ffffff 0%, #e2e8f0 50%, #cbd5e1 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 30px rgba(255, 255, 255, 0.1);
    animation: titleFloat 6s ease-in-out infinite alternate;
}

@keyframes titleFloat {
    0% {
        transform: translateY(0);
    }
    100% {
        transform: translateY(-10px);
    }
}

.subtitle {
    font-size: 1.4rem;
    font-weight: 300;
    color: #94a3b8;
    margin-bottom: 4rem;
    letter-spacing: 0.05em;
    opacity: 0.9;
    animation: subtitleFade 4s ease-in-out infinite alternate;
}

@keyframes subtitleFade {
    0% {
        opacity: 0.7;
    }
    100% {
        opacity: 1;
    }
}

.cta-button {
    background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    border: none;
    color: #ffffff;
    font-size: 1.2rem;
    font-weight: 500;
    padding: 1.2rem 3.5rem;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.4s ease;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.3);
    position: relative;
    overflow: hidden;
    margin-top: 2rem;
}

.cta-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.cta-button:hover::before {
    left: 100%;
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 20px 50px rgba(59, 130, 246, 0.5), 0 0 30px rgba(59, 130, 246, 0.4);
    background: linear-gradient(135deg, #2563eb 0%, #1e40af 100%);
}

.cta-button:active {
    transform: translateY(-1px);
}

/* Footer */
footer {
    position: fixed;
    bottom: 1.5rem;
    right: 2rem;
    z-index: 10;
}

.patent-notice {
    font-size: 0.75rem;
    color: #475569;
    font-weight: 300;
    letter-spacing: 0.02em;
    opacity: 0.5;
    transition: opacity 0.3s ease;
}

.patent-notice:hover {
    opacity: 0.7;
}

/* Responsive Design */
@media (max-width: 768px) {
    .logo {
        height: 80px;
    }
    
    .main-title {
        font-size: 3rem;
    }
    
    .subtitle {
        font-size: 1.1rem;
        margin-bottom: 2rem;
    }
    
    .cta-button {
        font-size: 1rem;
        padding: 0.8rem 2rem;
    }
    
    .hero-section {
        padding: 0 1rem;
    }
    
    footer {
        bottom: 1rem;
        right: 1rem;
    }
}

@media (max-width: 480px) {
    .main-title {
        font-size: 2.5rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
}