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

:root {
    --bg-dark: #181818;
    --text-white: #ffffff;
    --text-gray: #b0b0b0;
    --accent-glow: rgba(255, 255, 255, 0.15);
}

body {
    font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--bg-dark);
    background-image: radial-gradient(circle, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 6px 6px;
    color: var(--text-white);
    overflow: hidden;
    cursor: default;
}

.container {
    width: 100vw;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.content {
    text-align: center;
    max-width: 800px;
    width: 100%;
}

/* Logo */
.logo-wrapper {
    margin-bottom: 3rem;
}

.logo {
    width: clamp(320px, 40vw, 500px);
    height: auto;
    filter: drop-shadow(0 0px 0px rgba(255, 255, 255, 0));
    animation: logoGlow 0.6s cubic-bezier(0.16, 1, 0.3, 1) 5.0s forwards;
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    pointer-events: none;
    -webkit-user-drag: none;
    -khtml-user-drag: none;
    -moz-user-drag: none;
    -o-user-drag: none;
}

@keyframes logoGlow {
    to {
        filter: drop-shadow(0 10px 40px rgba(255, 255, 255, 0.15));
    }
}

/* Tagline */
.tagline {
    font-size: clamp(1.1rem, 2.5vw, 1.5rem);
    font-weight: 400;
    color: var(--text-gray);
    margin-bottom: 3rem;
    letter-spacing: 0.01em;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 1.2s cubic-bezier(0.16, 1, 0.3, 1) 5.4s forwards;
}

/* CTA Button - Premium Smooth Style */
.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1.25rem 2.5rem;
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--bg-dark);
    background: #ffffff;
    border: none;
    border-radius: 100px;
    text-decoration: none;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 1.2s cubic-bezier(0.16, 1, 0.3, 1) 5.8s forwards;
    transition: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 
        0 0 0 1px rgba(255, 255, 255, 0.1),
        0 8px 24px rgba(255, 255, 255, 0.12),
        0 16px 48px rgba(255, 255, 255, 0.08);
}

/* Gradient animé en arrière-plan */
.cta-button::before {
    content: '';
    position: absolute;
    inset: -2px;
    background: linear-gradient(
        135deg,
        rgba(255, 255, 255, 0.4),
        rgba(255, 255, 255, 0.1),
        rgba(255, 255, 255, 0.4)
    );
    background-size: 200% 200%;
    border-radius: 100px;
    opacity: 0;
    transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    animation: shimmer 3s ease-in-out infinite;
    z-index: -1;
}

/* Glow interne */
.cta-button::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(
        circle at center,
        rgba(255, 255, 255, 0.8) 0%,
        transparent 70%
    );
    border-radius: 100px;
    opacity: 0;
    transform: scale(0.5);
    transition: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Hover - expansion fluide */
.cta-button:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 
        0 0 0 1px rgba(255, 255, 255, 0.2),
        0 12px 32px rgba(255, 255, 255, 0.18),
        0 20px 60px rgba(255, 255, 255, 0.12),
        0 0 80px rgba(255, 255, 255, 0.15);
}

.cta-button:hover::before {
    opacity: 1;
}

.cta-button:hover::after {
    opacity: 0.3;
    transform: scale(1);
}

/* Active - légère compression */
.cta-button:active {
    transform: translateY(-1px) scale(0.98);
    transition: all 0.1s cubic-bezier(0.16, 1, 0.3, 1);
}

.button-text {
    position: relative;
    z-index: 1;
    transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.button-icon {
    position: relative;
    z-index: 1;
    transition: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.cta-button:hover .button-icon {
    transform: translateX(6px) scale(1.1);
}

.cta-button:active .button-icon {
    transform: translateX(4px) scale(1);
}

/* Animation de shimmer */
@keyframes shimmer {
    0%, 100% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
}


/* Animations */
@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 1.5rem;
    }
    
    .logo {
        width: 340px;
        height: auto;
    }
    
    .logo-wrapper {
        margin-bottom: 2rem;
    }
    
    .title {
        margin-bottom: 1rem;
    }
    
    .tagline {
        margin-bottom: 2.5rem;
    }
    
    .cta-button {
        padding: 1rem 2rem;
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .logo {
        width: 300px;
        height: auto;
    }
    
    .cta-button {
        padding: 0.875rem 1.75rem;
        font-size: 0.95rem;
    }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}