html {
    min-height: 100vh;
    min-width: 100vw;
}

body {
    margin: 0;
    padding: 0;
    width: 100vw;
    min-height: 100vh;
    height: auto;
    display: flex;
    align-items: center;
    text-align: center;
    font-family: Arial, sans-serif;
}

#app-content {
    width: 60%;
    max-width: 880px;
    padding: 30px 40px;
    margin: auto;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background-color: #ffffff;
    background-image: linear-gradient(to right, #ffffff, #e6e6e6);
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2);
    border-radius: 25px;
}

#app-content .header {
    width: 90%;
    height: auto;
    margin-bottom: 10px;
    font-size: xx-large;
}

#app-content .logo {
    width: 30%;
    height: auto;
    margin-bottom: 20px;
}

#app-content .description {
    margin-bottom: 20px;
}

#working-area .areas {
    margin-bottom: 25px;
}

#reminder-setting-area .reminder-days,
#reminder-setting-area .reminder-hours {
    margin-bottom: 10px;
}

#upload-area .button,
#upload-area .file-input {
    padding: 10px 15px;
    margin-bottom: 15px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s, box-shadow 0.3s;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    outline: none;
}

#upload-area .button:hover,
#upload-area .file-input:hover {
    background-color: #007BFF;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

#upload-area .file-input {
    display: block;
    width: 80%;
    color: #555;
    background-color: #f9f9f9;
}

#upload-area .button {
    background-color: #28a745;
    color: white;
}

#upload-area .button:disabled {
    background-color: #cccccc;
    cursor: not-allowed;
}

#upload-area #ical-upload {
    opacity: 0;
    position: absolute;
    z-index: -1;
}

#upload-area #ical-upload-label {
    background-color: #007bff;
    color: white;
    display: inline-block;
    cursor: pointer;
    text-align: center;
}

#upload-area #ical-upload-label:hover {
    background-color: #0056b3;
}

#app-content #download-area {
    display: block;
    overflow: hidden;
    height: 0;
    opacity: 0;
    transition: height 1.5s ease, opacity 0.5s ease;
}

#app-content #download-area.show-download-area {
    height: 175px;
    opacity: 1;
}

#app-content #download-button {
    background-color: #4CAF50;
    color: white;
    padding: 10px 20px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    margin: 4px 2px;
    cursor: pointer;
    border: none;
    border-radius: 5px;
    transition: background-color 0.3s;
}

#app-content #download-button:hover {
    background-color: #45a049;
}

#app-content #footer {
    margin-top: 30px;
}

h1,
a {
    text-wrap: nowrap;
}

@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    p {
        font-size: 1rem;
    }

    #app-content #download-area.show-download-area {
        height: 290px;
    }
}