body, html {
    margin: 0;
    padding: 0;
    height: 100%;
    font-family: 'Arial', sans-serif;
}

.background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 30%, rgba(168, 230, 207, 0.2) 0%, transparent 20%),
        radial-gradient(circle at 80% 70%, rgba(220, 237, 193, 0.2) 0%, transparent 20%),
        linear-gradient(135deg, #a8e6cf 0%, #dcedc1 50%, #ffd3b6 100%);
    z-index: -1;
    animation: gradientShift 15s ease infinite, pulse 8s ease infinite;
    background-size: 400% 400%;
}

@keyframes pulse {
    0% { opacity: 0.9; }
    50% { opacity: 1; }
    100% { opacity: 0.9; }
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.download-btn {
    position: relative;
    padding: 15px 30px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 50px;
    font-size: 18px;
    cursor: pointer;
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(76, 175, 80, 0.4);
}

.download-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(76, 175, 80, 0.6);
}

.download-btn:active {
    transform: translateY(1px);
}

.loader {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: inherit;
    border-radius: inherit;
    display: none;
    justify-content: center;
    align-items: center;
}

.loader::after {
    content: '';
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}
 a { 
    text-decoration: none; 
    color: inherit;
    cursor: pointer;
 }