html {
    font-size: 21px;
    height: 100%;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #fff;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #fff;
    padding: 12px 24px;
    box-shadow: 0 7px 9px rgba(0, 0, 0, 0.5);
    position: relative;
}

.nav-links {
    display: flex;
    gap: 1.2em;
}

.nav-links a {
    text-decoration: none;
    color: #6a859c;
    font-size: 1.2em;
}

.nav-links a:hover {
    color: #2e9dff;
}

.navbar .logo {
    display: flex;
    align-items: center;
    transition: transform 0.3s ease;
}

.navbar .logo img {
    height: 66px;
    margin-right: 10px;
    transition: transform 0.3s ease;
}

.navbar .logo p {
    font-size: 1.4em;
    margin: 0;
    color: #2e9dff;
    letter-spacing: 2px;
}

.navbar .logo:hover {
    transform: translateY(-3px);
}

.dropdown-btn {
    display: none;
    background-color: transparent;
    border: none;
    font-size: 1.5em;
    cursor: pointer;
    color: #6a859c;
}

@media (max-width: 780px) {
    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: #3b99d9;
        box-shadow: 0 7px 9px rgba(0, 0, 0, 0.5);
    }

    .nav-links a {
        text-align: left;
        padding-left: 2em;
        padding-top: 0.4em;
        padding-bottom: 0.4em;
        color: white;
    }

    .nav-links a:hover {
        color: #0088ff;
    }

    .dropdown-btn {
        display: block;
    }

    .nav-links.show {
        display: flex;
    }
}

.content {
    margin-top: 2.5em;
}

.content-title {
    color: #2e9dff;
    text-align: center;
    margin-top: 2em;
    font-size: 2em;
    transition: font-size 0.3s ease;
}

.content-text {
    color: #6a859c;
    text-align: center;
    font-size: 1em;
    transition: font-size 0.3s ease;
}

.content-introduce {
    color: #6a859c;
    max-width: 500px;
    text-align: center;
    font-size: 0.9em;
    padding-left: 3em;
    padding-right: 3em;
    margin: 0 auto;
    transition: font-size 0.3s ease;
}

.action-button {
    font-size: 1em;
    display: block;
    width: 500px;
    margin: 2em auto;
    padding: 0.5em auto;
    background-color: #2e9dff;
    color: white;
    text-align: center;
    text-decoration: none;
    padding: 10px 0;
    border-radius: 5px;
    transition: transform 0.5s ease;
}

.action-button:hover {
    transform: translateY(-3px);
}

.color-block {
    width: 100%;
    height: 400px;
    background-color: #edeff2;
    margin-bottom: 0;
    padding-bottom: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.color-block-text {
    color: #6a859c;
    text-align: center;
    font-size: 1em;
    margin-bottom: 1em;
    margin-top: 0;
    transition: font-size 0.3s ease;
}

.color-block-buttons {
    display: flex;
    gap: 1em;
}

.color-block-button {
    width: 10em;
    font-size: 1em;
    background-color: #2e9dff;
    color: white;
    text-align: center;
    text-decoration: none;
    padding: 10px 20px;
    border-radius: 5px;
    transition: transform 0.5s ease;
}

.color-block-button:hover {
    transform: translateY(-3px);
}

.site-footer {
    width: 100%;
    height: 2.5em;
    background-color: #181818;
    color: white;
    text-align: center;
    padding: 0.5em 0;
    margin-top: 0;
}

@media (max-width: 780px) {
    .action-button {
        width: 300px;
        font-size: 0.8em;
    }

    .content-title {
        font-size: 1.8em;
    }

    .content-text {
        font-size: 0.8em;
    }

    .content-introduce {
        font-size: 0.8em;
    }

    .color-block-text {
        font-size: 0.8em;
    }

    .color-block-button {
        width: 9em;
        font-size: 0.6em;
    }
}