body {
    margin: 0;
    font-family: 'Poppins', sans-serif;
    background: linear-gradient(120deg, #213448, #2c587d);
}

.nav-container {
    background: #fff;
    padding: 15px 0;
    text-align: center;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
}

.nav-links a {
    margin: 0 15px;
    color: #213448;
    font-weight: 500;
    text-decoration: none;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: #2c587d;
    text-decoration: underline;
}

.login-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 60px 15px;
}

.login-card {
    background: #fff;
    padding: 40px 30px;
    max-width: 400px;
    width: 100%;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
    text-align: center;
}

.login-card h2 {
    margin-bottom: 25px;
    color: #213448;
}

.form-group {
    margin-bottom: 20px;
    text-align: left;
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 6px;
    color: #333;
}

.form-group input {
    width: 100%;
    padding: 12px 10px;
    border: 1px solid #ccc;
    border-radius: 6px;
    font-size: 14px;
}

.login-card button {
    width: 100%;
    padding: 12px;
    background: #213448;
    color: #fff;
    font-weight: 600;
    border: none;
    border-radius: 6px;
    font-size: 15px;
    cursor: pointer;
    transition: 0.3s ease;
}

.login-card button:hover {
    background: #2a4d6b;
}

.signup-link {
    margin-top: 15px;
    font-size: 14px;
}

.signup-link a {
    color: #213448;
    font-weight: 500;
    text-decoration: none;
}

.signup-link a:hover {
    text-decoration: underline;
}

.error {
    background: #ffebeb;
    color: #b30000;
    padding: 10px;
    border-radius: 6px;
    margin-bottom: 15px;
    font-size: 14px;
}

@media screen and (max-width: 480px) {
    .login-card {
        padding: 30px 20px;
    }
}