body, html {
    height: 100%;
    margin: 0;
    position: relative; /* مهم جداً */
    background: linear-gradient(135deg, #2c5364, #203a43, #0f2027);
    overflow: hidden;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    direction: rtl;
    display: flex;
    justify-content: center;
    align-items: center;
}

.bubble {
    position: absolute;
    bottom: -100px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 50%;
    animation: rise 20s infinite ease-in;
    opacity: 0.5;
}

@keyframes rise {
    0% {
        transform: translateY(0) scale(1);
        opacity: 0.7;
    }

    100% {
        transform: translateY(-110vh) scale(1.5);
        opacity: 0.9;
    }
}

.login-container {
    direction: rtl;
    width: 500px;
    background: white;
    padding: 30px 25px;
    border-radius: 8px;
    box-shadow: 0 0 15px rgba(0,0,0,0.1);
    text-align: center;
    position: relative;
    z-index: 10; /* فوق الفقاعات */
}