* {
    box-sizing: border-box;
}

.form-container {
    width: 100%;
    margin: 0 auto;
    padding: 20px 20px;
    background: #131925;
    font-family: Arial, sans-serif;
    color: white;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.form-container .progress-bar {
    width: 100%;
    height: 4px;
    background: #2d3748;
    margin: 30px 0;
    position: relative;
}

.form-container .progress {
    height: 100%;
    background: #1434dd;
    transition: width 0.3s ease;
    width: 20%;
}

.form-container form {
    width: 100%;
}

.form-container .success-message {
    text-align: center;
}

.form-container .step {
    display: none;
    width: 100%;
}

.form-container .step.active {
    display: block;
}

.form-container h2 {
    text-align: center;
    margin-bottom: 30px;
    font-size: 28px;
}

.form-container .engine-types {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
}

.form-container .engine-item {
    cursor: pointer;
    text-align: center;
    position: relative;
    transition: transform 0.3s ease;
}

.form-container .engine-item:hover {
    transform: translateY(-5px);
}

.form-container .engine-item input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.form-container .custom-radio {
    display: block;
    width: 100%;
    height: 100%;
    border: 2px solid #1434dd;
    border-radius: 12px;
    padding: 10px;
    transition: all 0.3s ease;
}

.form-container .engine-item input:checked + .custom-radio {
    border-color: #fff;
    background: rgba(20, 52, 221, 0.2);
}

.form-container .engine-item img {
    width: 100%;
    max-width: 160px;
    height: auto;
    margin-bottom: 15px;
}

.form-container input[type="text"],
.form-container input[type="tel"] {
    width: 100%;
    padding: 15px;
    margin: 15px 0;
    background: #f5f5f5;
    border: 2px solid #1434dd;
    border-radius: 8px;
    color: #131925;
    font-size: 18px;
    transition: all 0.3s ease;
}

.form-container input:focus {
    outline: none;
    box-shadow: 0 0 8px rgba(20, 52, 221, 0.5);
}

.form-container .buttons {
    margin-top: 30px;
    display: flex;
    gap: 20px;
    justify-content: center;
}

.form-container button {
    padding: 15px 40px;
    background: #1434dd;
    border: none;
    border-radius: 8px;
    color: white;
    cursor: pointer;
    font-size: 18px;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.form-container button:hover {
    background: #0f2bb0;
    transform: translateY(-2px);
}

.form-container .hidden {
    display: none;
}

/* Адаптивность */
@media (max-width: 768px) {
    .form-container {
        padding: 15px 15px;
    }

    .form-container h2 {
        font-size: 24px;
        margin-bottom: 25px;
    }

    .form-container .engine-types {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }

    .form-container .engine-item img {
        max-width: 120px;
    }

    .form-container input[type="text"],
    .form-container input[type="tel"] {
        padding: 12px;
        font-size: 16px;
    }

    .form-container button {
        padding: 12px 30px;
        font-size: 16px;
    }
}

@media (max-width: 480px) {
    .form-container h2 {
        font-size: 22px;
        margin-bottom: 20px;
    }

    .form-container .engine-types {
        grid-template-columns: repeat(2, 1fr);
        max-width: 300px;
        margin: 0 auto 30px;
    }

    .form-container .engine-item img {
        max-width: 100%;
        height: auto;
    }

    .form-container .buttons {
        flex-direction: column;
        gap: 10px;
    }

    .form-container button {
        width: 100%;
        padding: 15px;
    }

    .form-container .progress-bar {
        margin: 20px 0;
    }

    .form-container input[type="text"],
    .form-container input[type="tel"] {
        margin: 10px 0;
        font-size: 14px;
    }
}

@media (max-width: 360px) {
    .form-container h2 {
        font-size: 20px;
    }

    .form-container .engine-types {
        max-width: 250px;
    }
}