body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f3f2f1;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 20px;
}

.container {
    background-color: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    width: 500px;
    text-align: center;
}

h1 {
    color: #d32f2f;
    /* Red */
    margin-bottom: 2rem;
}

h2 {
    color: #333;
    font-size: 1.2rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
    border-bottom: 2px solid #d32f2f;
    padding-bottom: 0.5rem;
    width: 100%;
    text-align: left;
}

.upload-area {
    border: 2px dashed #ffcdd2;
    /* Light Red */
    padding: 2rem;
    border-radius: 4px;
    cursor: pointer;
    transition: border-color 0.3s, background-color 0.3s;
}

.upload-area:hover {
    border-color: #d32f2f;
    background-color: #ffebee;
    /* Very Light Red */
}

input[type="file"] {
    display: none;
}

.btn {
    background-color: #d32f2f;
    /* Red */
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    margin-top: 1rem;
    transition: background-color 0.3s;
}

.btn:hover {
    background-color: #b71c1c;
    /* Darker Red */
}

.btn:disabled {
    background-color: #ef9a9a;
    /* Disabled Red */
    cursor: not-allowed;
}

#status {
    margin-top: 1rem;
    font-weight: 600;
}

.success {
    color: #388e3c;
}

/* Green */
.error {
    color: #d32f2f;
}

/* Red */

/* Document List */
#docList {
    text-align: left;
    margin-top: 1rem;
    max-height: 200px;
    overflow-y: auto;
}

.doc-item {
    background: #fafafa;
    padding: 10px;
    border-bottom: 1px solid #eee;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.doc-item:last-child {
    border-bottom: none;
}

.doc-name {
    font-weight: 500;
    color: #424242;
}

.doc-date {
    font-size: 0.8rem;
    color: #9e9e9e;
}