body {
    margin: 0;
    padding: 0;
    min-height: 100vh;
    font-family: 'Segoe UI', Arial, sans-serif;
    background: linear-gradient(to bottom, #0077be 0%, #003366 100%);
    overflow: hidden;
}

.container {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    z-index: 1;
}

header {
    background: rgba(255,255,255,0.1);
    border-radius: 20px;
    padding: 2rem 3rem;
    text-align: center;
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
    backdrop-filter: blur(4px);
    color: #fff;
}

.diver-img {
    width: 120px;
    margin-bottom: 1.5rem;
    opacity: 0.85;
    filter: drop-shadow(0 4px 16px #003366);
}

h1 {
    font-size: 2.5rem;
    margin: 0 0 0.5rem 0;
    letter-spacing: 2px;
    color: #fff;
    text-shadow: 0 2px 8px #003366;
}

.tagline {
    font-size: 1.2rem;
    color: #b3e0ff;
    margin: 0.5rem 0 0 0;
}

.bubble-bg {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    z-index: 0;
    pointer-events: none;
    background: transparent;
}

.bubble-bg:before, .bubble-bg:after {
    content: '';
    position: absolute;
    border-radius: 50%;
    opacity: 0.25;
    background: #fff;
    animation: bubbles 12s linear infinite;
}

.bubble-bg:before {
    width: 80px; height: 80px;
    left: 20%; bottom: -100px;
    animation-delay: 0s;
}
.bubble-bg:after {
    width: 40px; height: 40px;
    left: 70%; bottom: -60px;
    animation-delay: 4s;
}

@keyframes bubbles {
    0% { transform: translateY(0) scale(1); opacity: 0.3; }
    50% { opacity: 0.6; }
    100% { transform: translateY(-110vh) scale(1.2); opacity: 0; }
}