body {
    font-family: 'Poppins', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f5f7fa;
    color: #333;
}

header {
    background-color: #ffffff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 5%;
}

.logo {
    height: 40px;
}

.nav-links {
    display: flex;
    list-style-type: none;
    margin: 0;
    padding: 0;
}

.nav-links li {
    margin-left: 2rem;
}

.nav-links li a {
    text-decoration: none;
    color: #333;
}

.phone-button {
    background-color: #5da3f7;
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    cursor: pointer;
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: #333;
    padding: 0.5rem;
}

main {
    padding: 2rem 5%;
}

h1 {
    color: #333;
    font-size: 2.5rem;
    margin-bottom: 2rem;
}

h2 {
    color: #444;
    font-size: 1.8rem;
    margin-bottom: 1rem;
}

.input-section {
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
}

.input-section input[type="text"] {
    padding: 0.5rem;
    font-size: 1rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    width: 100%;
    max-width: 300px;
    margin-right: 1rem;
}

.primary-button, .secondary-button {
    padding: 0.5rem 1rem;
    font-size: 1rem;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.primary-button {
    background-color: #5da3f7;
    color: white;
}

.secondary-button {
    background-color: #e0e0e0;
    color: #333;
}

.primary-button:hover, .secondary-button:hover {
    opacity: 0.9;
}

.keyword-columns {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
}

.column {
    flex: 1 1 300px;
    display: flex;
    flex-direction: column;
}

.keyword-container {
    height: calc(100vh - 280px);
    min-height: 200px;
    resize: vertical;
    border: 1px solid #ddd;
    border-radius: 5px;
    padding: 1rem;
    background-color: #ffffff;
    font-size: 1rem;
    line-height: 1.5;
    margin-bottom: 1rem;
}

.loading {
    visibility: hidden;
    margin-left: 1rem;
}

.remaining-time {
    margin-top: 1rem;
    font-weight: bold;
}

@media (max-width: 768px) {
    nav {
        padding: 1rem;
    }

    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        background-color: #ffffff;
        box-shadow: 0 2px 4px rgba(0,0,0,0.1);
        padding: 1rem 0;
        z-index: 1000;
    }

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

    .nav-links li {
        margin: 0.5rem 1rem;
    }

    .nav-links li a {
        display: block;
        padding: 0.5rem 0;
        font-size: 1.1rem;
    }

    .mobile-menu-toggle {
        display: block;
    }

    .phone-button {
        display: none;
    }

    .input-section {
        flex-direction: column;
        align-items: stretch;
    }

    .input-section input[type="text"] {
        margin-bottom: 1rem;
        max-width: none;
    }

    .keyword-columns {
        flex-direction: column;
    }

    .column {
        flex: 1 1 100%;
    }

    h1 {
        font-size: 2rem;
        margin-bottom: 1.5rem;
    }

    .primary-button, .secondary-button {
        width: 100%;
        margin-bottom: 1rem;
    }
}



.loading-text {
    margin-left: 1rem;
    font-style: italic;
    color: #666;
}

.input-section {
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
}

.input-section input[type="text"] {
    padding: 0.5rem;
    font-size: 1rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    width: 100%;
    max-width: 300px;
    margin-right: 1rem;
    margin-bottom: 0.5rem;
}

.input-section button {
    margin-right: 1rem;
    margin-bottom: 0.5rem;
}

.checkbox-group {
    margin-left: 1rem;
    display: inline-block;
    vertical-align: middle;
}

.checkbox-group label {
    margin-right: 1rem;
    font-size: 1rem;
    color: #333;
}