/* ================== BASE ================== */
*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: Arial, sans-serif;
    background: linear-gradient(135deg, #e0f7fa, #ffffff, #f1f8e9);
    overflow-x: hidden;
}

/* ================== CONTENU ================== */
.main-wrapper {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 120px 20px 40px;
    position: relative;
}

.main-content {
    width: 100%;
    max-width: 900px;
    text-align: center;
    z-index: 2;
}

h1 {
    font-size: clamp(1.8rem, 5vw, 3rem);
    color: #0a2a43;
    letter-spacing: 2px;
    margin-bottom: 6px;
}

h3 {
    font-size: clamp(1.2rem, 2.7vw, 1.2rem);
    font-style: italic;
    font-weight: bold;
    color: #0a2a43;
    letter-spacing: 2px;
    margin-bottom: 60px;
}

/* ================== BOUTONS ================== */
.buttons-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    max-width: 420px;
    margin: 0 auto;
}

.user-btn {
    padding: 16px;
    background: #0a2a43;
    color: #fff;
    border-radius: 15px;
    text-decoration: none;
    font-weight: bold;
    font-size: 1.1rem;
    transition: transform 0.2s, background 0.3s;
}

.user-btn:hover {
    background: #053453;
    transform: translateY(-3px);
}

/* ================== BULLES ================== */
.bubble {
    position: absolute;
    border-radius: 50%;
    background: rgba(0, 150, 200, 0.25);
    animation: float 10s ease-in-out infinite;
    z-index: 1;
}

@keyframes float {
    0% { transform: translateY(0); }
    50% { transform: translateY(-40px); }
    100% { transform: translateY(0); }
}

/* ================== RESPONSIVE BOUTONS ================== */
@media (min-width: 600px) {
    .buttons-container {
        grid-template-columns: repeat(3, 1fr);
        max-width: 100%;
    }
}