*,
*::before,
*::after {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
    height: 100%;
    width: 100%;
    overscroll-behavior: none;
}

nav {
    position: fixed;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #2c3e50;
    height: 70px;
    width: 100%;
    z-index: 1000;
    user-select: none;
}

nav h2 {
    font-family: 'Helvetica Neue', sans-serif;
    color: white;
    margin-left: 60px;
    font-size: 26px;
}

nav ul {
    list-style: none;
    display: flex;
    margin-right: 60px;
    padding: 0;
}

nav ul li button {
    width: 100px;
    height: 70px;
    font-size: 16px;
    font-family: Arial, sans-serif;
    background: none;
    border: none;
    color: white;
    text-decoration: none;
    user-select: none;
    cursor: pointer;
}

nav ul li button:hover {
    background-color: #34495e;
}

main {
    padding-top: 70px;
    width: 100%;
}

main .main-container {
    display: flex;
    width: 80vw;
    height: 500px;
    margin: 100px auto;
}

main .main-container .main-container-left {
    width: 40%;
    height: 100%;
    display: flex;
    flex-direction: column;
    position: relative;
}

main .main-container .main-container-left h1 {
    font-family: 'Helvetica Neue', sans-serif;
    color: #2c3e50;
    margin-top: 16px;
    font-size: 46px;
    font-weight: bold;
    user-select: none;
}

main .main-container .main-container-left p {
    font-family: Arial, sans-serif;
    margin-top: 16px;
    font-size: 18px;
    line-height: 1.6;
    color: #555;
}

main .main-container .main-container-left div {
    position: absolute;
    bottom: 85px;
    margin-top: 16px;
}

main .main-container .main-container-left div button {
    padding: 10px 20px;
    font-size: 16px;
    background-color: #2980b9;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    user-select: none;
}

main .main-container .main-container-left div button:hover {
    background-color: #3498db;
}

main .main-container .main-container-right {
    width: 60%;
    height: 100%;
    box-sizing: border-box;
}

main .main-container .main-container-right img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
    box-sizing: border-box;
}

main h3 {
    font-family: 'Helvetica Neue', sans-serif;
    color: #2c3e50;
    font-size: 34px;
    margin: 0 0 40px 150px;
    user-select: none;
}

main .features {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 50px;
    margin: 0 150px 100px;
}

main .features .feature {
    max-width: 450px;
    height: 200px;
    display: grid;
    grid-template-columns: 65px auto;
    border-radius: 10px;
}

main .features .feature .circle {
    width: 45px;
    height: 45px;
    margin: 20px;
    background-color: #2c3e50;
    border-radius: 50%;
}

main .features .feature .circle img {
    width: 25px;
    height: 25px;
    margin: 10px;
    user-select: none;
}

main .features .feature .circle img:hover {
    width: 28px;
    height: 28px;
    margin: 8.5px;
}

main .features .feature .feature-text {
    font-family: 'Helvetica Neue', sans-serif;
    margin: 20px;
}

main .features .feature .feature-text h4 {
    margin: 5px 0 20px 0;
    font-size: 30px;
    color: #2c3e50;
    user-select: none;
}

main .features .feature .feature-text p {
    margin: 0;
    font-size: 18px;
    line-height: 1.4;
    color: #555;
}

main #how-it-works {
    margin: 80px 150px;
}

main #how-it-works h3 {
    font-family: 'Helvetica Neue', sans-serif;
    color: #2c3e50;
    font-size: 34px;
    margin-bottom: 20px;
    margin-left: 0;
}

main #how-it-works p {
    font-family: Arial, sans-serif;
    font-size: 18px;
    color: #555;
    margin-bottom: 40px;
}

main #how-it-works .how-it-works-container {
    display: flex;
    gap: 50px;
    flex-wrap: wrap;
}

main #how-it-works .how-it-works-container .code-block {
    flex: 1 1 600px;
    background-color: #f0f0f0;
    color: #2c3e50;
    font-family: monospace;
    padding: 20px;
    border-radius: 8px;
    line-height: 1.5;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
    overflow-x: auto;
    user-select: none;
}

main #how-it-works .how-it-works-container .code-block:hover {
    background-color: #ebebeb;
}

main #how-it-works .how-it-works-container .code-explanation {
    flex: 1 1 400px;
}

main #how-it-works .how-it-works-container .code-explanation ul {
    margin-top: 40px;
    font-family: Arial, sans-serif;
    color: #555;
    list-style: disc;
    padding-left: 20px;
}

main #how-it-works .how-it-works-container .code-explanation ul li {
    margin-bottom: 15px;
}

main #how-it-works .how-it-works-container .code-explanation p {
    font-family: Arial, sans-serif;
    font-size: 18px;
    line-height: 1.6;
    color: #555;
}

main #how-it-works .how-it-works-container .code-explanation p code {
    background-color: #f0f0f0;
    padding: 2px 4px;
    border-radius: 4px;
    font-family: monospace;
    font-size: 16px;
}

main .download-section {
    margin: 150px 150px 100px;
}

main .download-section h3 {
    font-family: 'Helvetica Neue', sans-serif;
    color: #2c3e50;
    font-size: 34px;
    margin-bottom: 50px;
    user-select: none;
    margin-left: 0;
}

main .download-section p {
    font-family: Arial, sans-serif;
    font-size: 18px;
    color: #555;
}

main .download-section ul {
    margin: 20px;
}

main .download-section button {
    padding: 10px 20px;
    font-size: 16px;
    background-color: #1d1d1d;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    user-select: none;
    margin: 40px;
}

main .download-section button:hover {
    background-color: #323232;
}

main #manual {
    margin: 80px 150px;
}

main #manual h3 {
    font-family: 'Helvetica Neue', sans-serif;
    color: #2c3e50;
    font-size: 34px;
    margin-bottom: 50px;
    margin-left: 0;
    user-select: none;
}

main #manual p {
    font-family: Arial, sans-serif;
    font-size: 18px;
    color: #555;
    margin-bottom: 40px;
}

main #manual .manual-steps {
    list-style: none;
    padding-left: 20px;
}

main #manual .manual-steps li {
    margin-bottom: 15px;
}

main #manual .manual-steps li p {
    font-family: Arial, sans-serif;
    font-size: 18px;
    line-height: 1.6;
    color: #555;
}

main #manual .manual-steps li p code {
    background-color: #f0f0f0;
    padding: 2px 4px;
    border-radius: 4px;
    font-family: monospace;
    font-size: 16px;
}

footer {
    background-color: #f8f8f8;
    padding: 50px 150px;
    text-align: center;
    width: 100%;
}

footer .footer-container {
    margin: 0 auto;
}

footer .footer-container p {
    font-family: Arial, sans-serif;
    color: #555;
    margin: 10px 0;
    line-height: 1.6;
}

footer .footer-container .footer-links {
    list-style: none;
    padding: 0;
    margin: 20px 0;
    display: flex;
    justify-content: center;
    gap: 30px;
}

footer .footer-container .footer-links li a {
    text-decoration: none;
    color: #1e1e1e;
    font-weight: bold;
    transition: color 0.3s;
}

footer .footer-container .footer-links li a:hover {
    color: #2f2f2f;
}

@media (max-width: 1024px) {
    nav h2 {
        margin-left: 30px;
        font-size: 22px;
    }

    nav ul {
        margin-right: 30px;
    }

    nav ul li button {
        width: 80px;
        font-size: 14px;
    }

    main .main-container {
        flex-direction: column;
        width: 90vw;
        height: auto;
        margin: 60px auto;
    }

    main .main-container .main-container-left,
    main .main-container .main-container-right {
        width: 100%;
        height: auto;
    }

    main .main-container .main-container-left h1 {
        font-size: 36px;
    }

    main .main-container .main-container-left p {
        font-size: 16px;
    }

    main .main-container .main-container-left div {
        position: static;
        margin-top: 20px;
    }

    main .main-container .main-container-right {
        margin-top: 30px;
    }

    main .main-container .main-container-right img {
        max-height: 300px;
    }

    main .features {
        grid-template-columns: 1fr 1fr;
        margin: 0 50px 80px;
    }

    main #how-it-works,
    main .download-section,
    main #manual {
        margin: 60px 50px;
    }

    main h3 {
        margin-left: 50px;
        font-size: 28px;
    }

    footer {
        padding: 40px 50px;
    }
}

@media (max-width: 600px) {
    nav {
        flex-direction: column;
        height: auto;
        padding: 10px 0;
    }

    nav h2 {
        margin: 10px 0;
        font-size: 20px;
    }

    nav ul {
        flex-direction: column;
        margin: 0;
    }

    nav ul li button {
        width: 100%;
        height: 50px;
    }

    main .main-container {
        margin: 40px auto;
        width: 95vw;
    }

    main .main-container .main-container-left h1 {
        font-size: 28px;
    }

    main .main-container .main-container-left p {
        font-size: 14px;
    }

    main .features {
        grid-template-columns: 1fr;
        margin: 0 20px 60px;
        gap: 30px;
    }

    main #how-it-works,
    main .download-section,
    main #manual {
        margin: 40px 20px;
    }

    main h3 {
        margin-left: 20px;
        font-size: 24px;
    }

    footer {
        padding: 30px 20px;
    }

    footer .footer-container .footer-links {
        flex-direction: column;
        gap: 15px;
    }
}