body {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f4f7f6;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    color: #333;
}

.container {
    text-align: center;
    background: white;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

h1 span {
    color: #27ae60; /* Bio-themed Green */
}

.loader {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #27ae60;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.btn {
    display: inline-block;
    margin-top: 20px;
    padding: 10px 25px;
    background-color: #27ae60;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    transition: 0.3s;
}

.btn:hover {
    background-color: #219150;
}

.subtext {
    font-size: 0.9rem;
    color: #777;
    font-style: italic;
}