html, body {
    width: 100%;
    position: relative;
    background: #142425;
    background: radial-gradient(circle, rgba(20, 36, 37, 1) 0%, rgba(24, 61, 57, 1) 30%, rgba(0, 0, 0, 1) 100%);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    color: #ffffff;
    font-family: 'Segoe UI', sans-serif;
    height: 100vh;
    margin: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}
.form-control::placeholder {
    color: #cccccc;
    opacity: 1;
}
.signup-box {
    background-color: rgba(20, 20, 20, 0.95);
    padding: 2.5rem;
    border-radius: 15px;
    box-shadow: 0 0 25px #00ffcc;
    width: 100%;
    max-width: 450px;
    text-align: center;
}

.signup-box h2 {
    margin-bottom: 1.5rem;
    font-weight: 600;
    color: #00ffcc;
}

.form-control {
    background-color: #1c1c1c;
    border: 1px solid #00ffcc;
    color: #ffffff;
}

.form-control:focus {
    box-shadow: 0 0 10px #00ffcc;
    border-color: #00ffcc;
}

.btn-neon {
    background-color: #00ffcc;
    color: #000;
    border: none;
    padding: 0.75rem;
    width: 100%;
    border-radius: 50px;
    font-weight: bold;
    transition: 0.3s ease;
}

.btn-neon:hover {
    background-color: #00d4aa;
    box-shadow: 0 0 15px #00ffcc;
}

a {
    color: #00ffcc;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}