body {
    background: linear-gradient(135deg, #667eea, #764ba2);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Segoe UI', sans-serif;
}

.login-card {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 16px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
    padding: 40px;
    width: 400px;
    animation: fadeIn 0.6s ease-in-out;
}

    .login-card h3 {
        font-weight: bold;
        text-align: center;
        margin-bottom: 25px;
        color: #333;
    }

.input-group {
    margin-bottom: 20px;
}

.form-control {
    border-radius: 10px;
    height: 48px;
}

.input-group-text {
    border-radius: 10px;
    background: #f1f1f1;
}

.captcha-box {
    background: #222;
    color: #fff;
    font-weight: bold;
    font-size: 22px;
    letter-spacing: 4px;
    padding: 8px 15px;
    border-radius: 10px;
    user-select: none;
}

.btn-primary {
    border-radius: 10px;
    height: 48px;
    font-weight: 600;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}