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

body {
    font-family: system-ui, sans-serif;
    background: linear-gradient(135deg, #0f172a, #1e293b);
    color: #e2e8f0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 40px 20px;
}

header {
    text-align: center;
    margin-bottom: 40px;
}

h1 {
    font-size: 3rem;
    font-weight: 700;
    color: #f8fafc;
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.8;
}

.card {
    background: rgba(255, 255, 255, 0.05);
    padding: 25px 30px;
    border-radius: 12px;
    backdrop-filter: blur(6px);
    max-width: 600px;
    text-align: center;
    margin-bottom: 30px;
    border: 1px solid rgba(255,255,255,0.1);
}

.card h2 {
    margin-bottom: 15px;
    font-size: 1.8rem;
}

.btn {
    display: inline-block;
    padding: 12px 25px;
    background: #3b82f6;
    color: white;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: background 0.2s ease;
}

.btn:hover {
    background: #2563eb;
}

footer {
    margin-top: auto;
    opacity: 0.6;
    font-size: 0.9rem;
}