/* Variables */
    :root {
        --primary-color: #005bbb;
        --primary-dark: #004798;
        --secondary-color: #e87722;
        --background-color: #f5f7fa;
        --sidebar-color: #f0f5ff;
        --right-panel-color: #f8fafd;
        --border-color: #e1e5eb;
        --text-color: #333333;
        --text-secondary: #666666;
        --card-color: #ffffff;
        --hover-color: #f8f9fa;
        --disabled-color: #cccccc;
    }

    /* Global Styles */
    * {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
    }

    body {
        font-family: 'Inter', sans-serif;
        background-color: var(--background-color);
        color: var(--text-color);
        line-height: 1.5;
    }

    h1, h2, h3, h4, h5, h6 {
        font-weight: 600;
    }

    /* App Container */
    .app-container {
        display: grid;
        grid-template-columns: 280px 1fr 300px;
        height: 100vh;
        overflow: hidden;
    }

    /* Sidebar */
    .sidebar {
        background-color: var(--sidebar-color);
        padding: 1.5rem;
        overflow-y: auto;
        border-right: 1px solid var(--border-color);
    }

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

    .logo img {
        width: 40px;
        height: 40px;
        margin-right: 10px;
    }

    .logo h1 {
        font-size: 1.2rem;
        color: var(--primary-color);
        margin: 0;
    }

    .search-box {
        display: flex;
        margin-bottom: 1.5rem;
    }

    .search-box input {
        flex: 1;
        padding: 0.75rem;
        border: 1px solid var(--border-color);
        border-radius: 8px 0 0 8px;
        font-size: 0.9rem;
        outline: none;
    }

    .search-box input:focus {
        border-color: var(--primary-color);
    }

    .search-box button {
        background-color: var(--primary-color);
        color: white;
        border: none;
        border-radius: 0 8px 8px 0;
        padding: 0 1rem;
        cursor: pointer;
    }

    .search-box button:hover {
        background-color: var(--primary-dark);
    }

    .category {
        margin-bottom: 1.5rem;
    }

    .category h3 {
        background-color: var(--primary-color);
        color: white;
        padding: 0.5rem 1rem;
        border-radius: 6px;
        font-size: 1rem;
        margin-bottom: 0.75rem;
    }

    .link-card {
        display: block;
        padding: 0.75rem;
        background-color: white;
        border-left: 3px solid var(--secondary-color);
        border-radius: 4px;
        margin-bottom: 0.5rem;
        text-decoration: none;
        color: var(--text-color);
        transition: transform 0.2s, box-shadow 0.2s;
    }

    .link-card:hover {
        transform: translateY(-2px);
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        background-color: var(--hover-color);
    }

    .link-card h4 {
        font-size: 0.9rem;
        margin: 0 0 0.25rem 0;
        color: var(--primary-color);
    }

    .link-card p {
        font-size: 0.8rem;
        margin: 0;
        color: var(--text-secondary);
    }

    /* Main Content */
    .main-content {
        display: flex;
        flex-direction: column;
        height: 100vh;
    }

    header {
        padding: 1rem 1.5rem;
        background-color: white;
        border-bottom: 1px solid var(--border-color);
    }

    header h1 {
        font-size: 1.25rem;
        display: flex;
        align-items: center;
    }

    header h1 i {
        margin-right: 0.5rem;
        color: var(--primary-color);
    }

    .chat-container {
        flex: 1;
        padding: 1.5rem;
        overflow-y: auto;
        scroll-behavior: smooth;
    }

    .empty-chat {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        height: 100%;
        padding: 2rem;
        text-align: center;
    }

    .empty-chat h2 {
        font-size: 1.5rem;
        margin-bottom: 1rem;
        color: var(--primary-color);
    }

    .empty-chat p {
        color: var(--text-secondary);
        margin-bottom: 2rem;
        max-width: 500px;
    }

    .quick-questions {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.5rem;
    }

    .quick-question {
        background-color: rgba(232, 119, 34, 0.1);
        color: var(--secondary-color);
        border: 1px solid rgba(232, 119, 34, 0.3);
        border-radius: 8px;
        padding: 0.5rem 1rem;
        font-size: 0.85rem;
        cursor: pointer;
        transition: all 0.2s;
    }

    .quick-question:hover {
        background-color: rgba(232, 119, 34, 0.2);
    }

    .messages {
        display: flex;
        flex-direction: column;
    }

    .message {
        margin-bottom: 1rem;
        max-width: 85%;
        animation: fadeIn 0.3s ease-in-out;
    }

    @keyframes fadeIn {
        from { opacity: 0; transform: translateY(20px); }
        to { opacity: 1; transform: translateY(0); }
    }

    .message.user {
        margin-left: auto;
    }

    .message.assistant {
        margin-right: auto;
    }

    .bubble {
        padding: 1rem;
        border-radius: 1.2rem;
        box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    }

    .message.user .bubble {
        background-color: var(--primary-color);
        color: white;
        border-bottom-right-radius: 0.25rem;
    }

    .message.assistant .bubble {
        background-color: white;
        border: 1px solid var(--border-color);
        border-bottom-left-radius: 0.25rem;
    }

    .meta {
        font-size: 0.75rem;
        margin-top: 0.25rem;
        color: var(--text-secondary);
    }

    .message.user .meta {
        text-align: right;
    }

    .message.assistant .meta {
        text-align: left;
    }

    .input-container {
        border-top: 1px solid var(--border-color);
        padding: 1rem 1.5rem;
        background-color: white;
    }

    .message-input {
        display: flex;
        background-color: white;
        border-radius: 8px;
        overflow: hidden;
        border: 1px solid var(--border-color);
    }

    .message-input input {
        flex: 1;
        padding: 1rem;
        border: none;
        outline: none;
        font-size: 0.95rem;
    }

    .message-input button {
        background-color: var(--primary-color);
        color: white;
        border: none;
        padding: 0 1.25rem;
        cursor: pointer;
        transition: background-color 0.2s;
    }

    .message-input button:hover {
        background-color: var(--primary-dark);
    }

    .message-input button:disabled {
        background-color: var(--disabled-color);
        cursor: not-allowed;
    }

    /* Right Panel */
    .right-panel {
        background-color: var(--right-panel-color);
        padding: 1.5rem;
        overflow-y: auto;
        border-left: 1px solid var(--border-color);
    }

    .right-panel h3 {
        margin-bottom: 1rem;
        font-size: 1.1rem;
    }

    .source-card {
        background-color: white;
        border-radius: 8px;
        padding: 1rem;
        margin-bottom: 1rem;
        box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    }

    .source-card h4 {
        font-size: 0.95rem;
        margin: 0 0 0.5rem 0;
        color: var(--primary-color);
    }

    .source-card .link {
        display: flex;
        align-items: center;
        font-size: 0.8rem;
        color: var(--secondary-color);
        text-decoration: none;
        margin-bottom: 0.25rem;
    }

    .source-card .link i {
        margin-left: 0.25rem;
    }

    .source-card .score {
        font-size: 0.75rem;
        color: var(--text-secondary);
    }

    .admin-tools {
        margin-top: 2rem;
        padding-top: 1rem;
        border-top: 1px solid var(--border-color);
    }

    .admin-btn {
        display: block;
        width: 100%;
        padding: 0.75rem;
        margin-bottom: 0.75rem;
        background-color: var(--primary-color);
        color: white;
        border: none;
        border-radius: 6px;
        cursor: pointer;
        transition: background-color 0.2s;
    }

    .admin-btn:hover {
        background-color: var(--primary-dark);
    }

    /* Responsive */
    @media (max-width: 1024px) {
        .app-container {
            grid-template-columns: 0px 1fr 0px;
        }
        
        .sidebar, .right-panel {
            display: none;
        }
    }