:root {
    --primary: #2563eb;
    --secondary: #1e40af;
    --accent: #3b82f6;
    --text: #1f2937;
    --bg: #0a0f1f;
}

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

body {
    font-family: 'Inter', system-ui, sans-serif;
    background: var(--bg);
    color: white;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: 
        radial-gradient(circle at 0% 0%, #4a90e2, transparent 50%),
        radial-gradient(circle at 100% 0%, #2563eb, transparent 50%),
        radial-gradient(circle at 50% 100%, #1e40af, transparent 50%);
    filter: blur(30px);
    animation: backgroundMove 20s ease infinite;
}

@keyframes backgroundMove {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1) rotate(3deg); }
}

/* Conteneur principal ajusté */
.container {
    text-align: center;
    padding: 2.5rem 3rem;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    max-width: 500px;
    width: 90%;
    margin: 2rem;
    animation: fadeInUp 1s ease-out;
    position: relative;
    overflow: hidden;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Effet de flottement */
.floating {
    animation: floating 3s ease-in-out infinite;
}

@keyframes floating {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

/* Titre avec pulsation et flottement */
.title {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #60a5fa, #3b82f6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: titleGlow 2s ease-in-out infinite, floating 3s ease-in-out infinite;
}

@keyframes titleGlow {
    0%, 100% { filter: brightness(100%); }
    50% { filter: brightness(150%); }
}

.subtitle {
    font-size: 1.5rem;
    color: rgba(255, 255, 255, 0.8);
    margin: 0.5rem 0 1.5rem;
    animation: fadeInUp 1s ease-out;
}

/* Bouton avec brillance */
.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
    padding: 1rem 2rem;
    font-size: 1.1rem;
    font-weight: 500;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    text-decoration: none;
    border-radius: 30px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
    position: relative;
    overflow: hidden;
}

.download-btn::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: 0.5s;
}

.download-btn:hover::before {
    left: 100%;
}

.download-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
}

/* Apparition progressive des icônes de sécurité */
.security-features {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 1.5rem;
}

.security-item {
    display: flex;
    align-items: center;
    font-size: 1.2rem;
    color: #60a5fa;
    gap: 0.5rem;
    animation: fadeInUp 1s ease-out;
    animation-delay: calc(var(--i) * 0.3s);
}

/* Particules flottantes */
.particles {
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
    z-index: -1;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: #60a5fa;
    border-radius: 50%;
    animation: particleFloat 10s infinite linear;
}

@keyframes particleFloat {
    0% { transform: translateY(0); opacity: 0; }
    50% { opacity: 1; }
    100% { transform: translateY(-100vh); opacity: 0; }
}