:root {
    --bg-color: #0d1117;
    --text-color: #ffffff;
    --primary-color: #007bff;
    --form-bg: rgba(255, 255, 255, 0.05);
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    overflow: hidden;
    perspective: 1000px; /* This is key for the 3D effect */
}

.water-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('data:image/svg+xml,...'); /* Replace with a subtle water texture SVG or a low-res image */
    background-repeat: repeat;
    background-size: 200px 200px;
    animation: waterFlow 30s linear infinite;
    opacity: 0.1;
    z-index: -1;
}

@keyframes waterFlow {
    from {
        background-position: 0 0;
    }
    to {
        background-position: 200px 200px;
    }
}

.login-container {
    transform-style: preserve-3d;
    transform: rotateX(15deg) rotateY(-15deg); /* Initial 3D tilt */
    transition: transform 0.5s ease-in-out;
}

.login-container:hover {
    transform: rotateX(0deg) rotateY(0deg); /* Tilt straightens on hover */
}

.login-box {
    background: var(--form-bg);
    border-radius: 20px;
    padding: 40px;
    text-align: center;
    box-shadow: 
        0 4px 6px rgba(0, 0, 0, 0.1),
        0 10px 20px rgba(0, 0, 0, 0.2),
        inset 0 0 10px rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.login-btn {
    background-color: var(--primary-color);
    color: var(--text-color);
    border: none;
    padding: 15px 30px;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 15px rgba(0, 123, 255, 0.3);
}

.login-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 123, 255, 0.5);
}