body {
    font-family: 'Open Sans', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f7f7f7;
    color: #333;
    display: flex;
    justify-content: center;
}

.container {
    display: flex;
    flex-direction: column;
    gap: 10px;
    width: 100%;
    max-width: 500px;
    padding: 20px;
}

.upload-card {
    display: flex;
    flex-direction: column;
    gap: 24px;
    background-color: white;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 24px;
}

h1 {
    text-align: center;
    font-size: 20px;
    margin: 0;
    color: #333;
}

#file-info {
    display: flex;
    flex-direction: column;
    text-align: center;
}

#file-none {
    font-size: 14px;
    color: #666;
}

#file-list {
    border-collapse: collapse;
    color: #3a3a3a;
}

#file-list td {
    text-align: left;
    padding: 2px 6px;
}

#file-list tr.error {
    color: #971500;
}

#file-list td.file-size {
    text-align: right;
}

#file-list td > button.file-remove-button {
    padding: 10px 16px;
    border-radius: 6px;
}

.button {
    user-select: none;
    padding: 12px 18px;
    border-radius: 8px;
    text-align: center;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: all 0.2s ease;
    background-color: #e6e7ed;
    color: #3a3a3a;
}

.button:not([hidden]) {
    display: block;
}

.button:enabled:hover {
    background-color: #d9dbe3;
}

.button:disabled, .button.disabled, .button.disabled:hover {
    background-color: #e6e7ed;
    color: #9c9ca1;
    cursor: default;
}

#upload-button {
    background-color: #0d6efd;
    color: white;
}

#upload-button:enabled:hover {
    background-color: #004ebf;
}

#upload-button:disabled {
    background-color: #8dacd8;
    color: #dae8fb;
    cursor: default;
}

#file-input {
    display: none;
}

#main-error {
    background-color: #ff6945;
    color: #220804;
    padding: 15px;
    border-radius: 8px;
    font-size: 1.1em;
    transition: all 0.2s ease;
}