.documents-container {
    display: flex;
    gap: 30px;
    max-width: 1400px;
    margin: 0 auto;
    background: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    margin-bottom: 50px;
}

.sidebar {
    width: 280px;
    border-right: 2px solid #e0e0e0;
    padding-right: 25px;
}

.sidebar h2 {
    color: #1a1a2e;
    font-size: 20px;
    margin-top: 0;
    padding-bottom: 15px;
    border-bottom: 2px solid #4a90d9;
}

.doc-list {
    list-style: none;
    padding: 0;
    margin: 20px 0 0 0;
}

.doc-list li {
    margin-bottom: 8px;
}

.doc-list button {
    width: 100%;
    text-align: left;
    padding: 12px 15px;
    border: none;
    background: none;
    color: #333;
    font-size: 15px;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.2s;
    font-weight: 500;
}

.doc-list button:hover {
    background: #e8f0fe;
    color: #1a73e8;
}

.doc-list button.active {
    background: #1a73e8;
    color: white;
}

.viewer-wrapper {
    flex: 1;
    min-height: 600px;
    background: #fafafa;
    border-radius: 8px;
    overflow: hidden;
}

#pdf-viewer {
    height: 600px;
    width: 100%;
}

@media (max-width: 768px) {
    .documents-container {
        flex-direction: column;
        padding: 15px;
        gap: 15px;
        border-radius: 8px;
    }

    .sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 2px solid #e0e0e0;
        padding-right: 0;
        padding-bottom: 15px;
    }

    .sidebar h2 {
        font-size: 18px;
        padding-bottom: 10px;
        border-bottom: 2px solid #4a90d9;
    }

    .doc-list {
        display: flex;
        flex-direction: column;
        gap: 5px;
        margin: 15px 0 0 0;
    }

    .doc-list li {
        margin-bottom: 0;
    }

    .doc-list button {
        padding: 10px 12px;
        font-size: 14px;
        border-radius: 6px;
    }

    .doc-list button::before {
        content: "📄 ";
    }

    .viewer-wrapper {
        min-height: 400px;
        border-radius: 6px;
    }

    #pdf-viewer {
        height: 400px;
    }
}

@media (max-width: 480px) {
    .documents-container {
        padding: 10px;
        gap: 10px;
        border-radius: 6px;
    }

    .sidebar h2 {
        font-size: 16px;
        padding-bottom: 8px;
    }

    .doc-list button {
        padding: 8px 10px;
        font-size: 13px;
    }

    .viewer-wrapper {
        min-height: 300px;
    }

    #pdf-viewer {
        height: 300px;
    }
}