:root {
        --usjr-green: #004225;  /* Deep Josenian Green */
        --usjr-green-dark: #002915;  /* Darker green */
        --usjr-green-light: #005a32;  /* Lighter green */
        --usjr-gold: #d4af37;   /* Josenian Gold */
        --usjr-gold-light: #f0d158;   /* Lighter gold */
        --bg-primary: #f8f8f8;  /* Light background like ChatGPT */
        --bg-secondary: #ffffff; /* White for messages */
        --bg-user: #004225; /* Green for user messages */
        --text-primary: #2d2d2d;
        --text-secondary: #5a5a5a;
        --text-on-green: #ffffff;
        --border-color: #d4d4d4;
    }

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

    body {
        font-family: 'Söhne', 'Segoe UI', 'Helvetica Neue', sans-serif;
        background: #ffffff;
        height: 100vh;
        display: flex;
        flex-direction: column;
        margin: 0;
        padding: 0;
        color: var(--text-primary);
    }

    .chat-container {
        width: 100%;
        height: 100vh;
        background: #ffffff;
        display: flex;
        flex-direction: column;
        overflow: hidden;
    }

    .chat-header {
        background: var(--usjr-green);
        border-bottom: 2px solid var(--usjr-gold);
        padding: 14px 20px;
        display: flex;
        justify-content: space-between;
        align-items: center;
        position: sticky;
        top: 0;
        z-index: 10;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    }

    .header-left {
        display: flex;
        align-items: center;
        gap: 12px;
    }

    .header-title {
        font-size: 15px;
        font-weight: 700;
        color: var(--usjr-gold);
        letter-spacing: 0.5px;
    }

    .new-chat-btn {
        background: transparent;
        border: 1px solid var(--usjr-gold);
        color: var(--usjr-gold);
        padding: 8px 16px;
        border-radius: 6px;
        cursor: pointer;
        font-size: 13px;
        font-weight: 600;
        transition: all 0.2s;
        display: flex;
        align-items: center;
        gap: 6px;
    }

    .new-chat-btn:hover {
        background: var(--usjr-gold);
        color: var(--usjr-green);
    }

    .chat-messages {
        flex: 1;
        overflow-y: auto;
        scroll-behavior: smooth;
        background: #ffffff;
    }

    .message {
        width: 100%;
        padding: 28px 0;
        background: #ffffff;
    }

    .message.user {
        background: #ffffff;
    }

    .message.bot {
        background: #ffffff;
    }

    .message-wrapper {
        max-width: 48rem;
        margin: 0 auto;
        padding: 0 20px;
        display: flex;
        gap: 16px;
        align-items: flex-start;
    }

    /* User messages on right side - no avatar in wrapper for bubble style */
    .message.user .message-wrapper {
        justify-content: flex-end;
        gap: 12px;
    }

    .message-avatar {
        width: 32px;
        height: 32px;
        border-radius: 6px;
        display: flex;
        align-items: center;
        justify-content: center;
        flex-shrink: 0;
        font-weight: 600;
        font-size: 15px;
    }

    .message.user .message-avatar {
        background: var(--usjr-green);
        color: white;
    }

    .message.bot .message-avatar {
        background: var(--usjr-gold);
        color: var(--usjr-green);
    }

    .message-content {
        flex: 1;
        color: var(--text-primary);
        font-size: 15px;
        line-height: 1.5;
        word-wrap: break-word;
        overflow-wrap: break-word;
    }

    /* User message bubble - like original */
    .message.user .message-content {
        flex: none;
        max-width: 75%;
        padding: 12px 16px;
        background: #f0f0f0;
        color: var(--text-primary);
        border-radius: 18px;
        border-bottom-right-radius: 4px;
    }

    /* Bot message - flat like ChatGPT */
    .message.bot .message-content {
        text-align: left;
        color: var(--text-primary);
    }

    .message.bot .message-content a {
        color: var(--usjr-green);
        text-decoration: underline;
        word-break: break-word;
        overflow-wrap: anywhere;
        cursor: pointer;
        pointer-events: auto;
    }

    .message.bot .message-content a:hover {
        filter: brightness(1.06);
    }

    /* Hide avatar for user messages in bubble style */
    .message.user .message-avatar {
        display: none;
    }

    /* Markdown styling */
    .message-content h1,
    .message-content h2,
    .message-content h3 {
        color: var(--text-primary);
        margin-top: 20px;
        margin-bottom: 10px;
        font-weight: 600;
        line-height: 1.4;
    }

    .message-content h1:first-child,
    .message-content h2:first-child,
    .message-content h3:first-child {
        margin-top: 0;
    }

    .message-content h1 { font-size: 1.5em; }
    .message-content h2 { font-size: 1.3em; }
    .message-content h3 { font-size: 1.1em; }

    .message-content ul,
    .message-content ol {
        margin: 16px 0;
        padding-left: 28px;
    }

    .message-content li {
        margin: 8px 0;
        line-height: 1.75;
    }

    .message-content li > p {
        margin: 4px 0;
    }

    .message-content p {
        margin: 12px 0;
    }

    .message-content p:first-child {
        margin-top: 0;
    }

    .message-content p:last-child {
        margin-bottom: 0;
    }

    .message-content strong {
        color: var(--usjr-gold);
        font-weight: 600;
    }

    .message-content code {
        background: rgba(212, 175, 55, 0.1);
        color: var(--usjr-green);
        padding: 2px 6px;
        border-radius: 3px;
        font-family: 'SF Mono', 'Consolas', 'Monaco', monospace;
        font-size: 0.9em;
        border: 1px solid rgba(212, 175, 55, 0.3);
    }

    .message-content pre {
        background: #f5f5f5;
        padding: 16px;
        border-radius: 6px;
        overflow-x: auto;
        margin: 16px 0;
        border: 1px solid var(--border-color);
    }

    .message-content pre code {
        background: none;
        padding: 0;
        color: var(--text-primary);
        border: none;
    }

    .message-content blockquote {
        border-left: 3px solid var(--usjr-gold);
        padding-left: 16px;
        margin: 16px 0;
        color: var(--text-secondary);
        font-style: italic;
    }

    .chat-input-container {
        border-top: 2px solid var(--usjr-gold);
        padding: 20px 0;
        background: var(--bg-secondary);
    }

    .chat-input {
        max-width: 48rem;
        margin: 0 auto;
        padding: 0 20px;
        display: flex;
        gap: 12px;
        align-items: flex-end;
    }

    .input-wrapper {
        flex: 1;
        position: relative;
    }

    #userInput {
        width: 100%;
        padding: 12px 50px 12px 16px;
        background: #ffffff;
        border: 2px solid var(--border-color);
        border-radius: 12px;
        font-size: 16px;
        color: var(--text-primary);
        outline: none;
        transition: all 0.2s;
        resize: none;
        max-height: 200px;
        min-height: 52px;
        font-family: inherit;
        line-height: 1.5;
    }

    #userInput:focus {
        border-color: var(--usjr-gold);
        box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.2);
    }

    #userInput::placeholder {
        color: var(--text-secondary);
    }

    #sendButton {
        position: absolute;
        right: 8px;
        bottom: 8px;
        width: 36px;
        height: 36px;
        background: var(--usjr-gold);
        color: var(--usjr-green);
        border: none;
        border-radius: 8px;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
        transition: all 0.2s;
        font-weight: bold;
    }

    #sendButton:hover:not(:disabled) {
        background: #e0c24b;
    }

    #sendButton:disabled {
        background: #565869;
        cursor: not-allowed;
        opacity: 0.5;
    }

    /* Loading animation - ChatGPT style */
    .typing-indicator {
        display: flex;
        gap: 4px;
        align-items: center;
        padding: 4px 0;
    }

    .typing-indicator span {
        width: 8px;
        height: 8px;
        background: var(--usjr-green);
        border-radius: 50%;
        animation: typing 1.4s infinite ease-in-out;
    }

    .typing-indicator span:nth-child(1) { animation-delay: 0s; }
    .typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
    .typing-indicator span:nth-child(3) { animation-delay: 0.4s; }

    @keyframes typing {
        0%, 60%, 100% { 
            opacity: 0.3;
            transform: translateY(0);
        }
        30% { 
            opacity: 1;
            transform: translateY(-8px);
        }
    }

    /* Scrollbar styling */
    .chat-messages::-webkit-scrollbar {
        width: 8px;
    }

    .chat-messages::-webkit-scrollbar-track {
        background: var(--bg-primary);
    }

    .chat-messages::-webkit-scrollbar-thumb {
        background: var(--usjr-gold);
        border-radius: 4px;
    }

    .chat-messages::-webkit-scrollbar-thumb:hover {
        background: var(--usjr-green);
    }

    /* Mobile Responsiveness */
    @media (max-width: 768px) {
        .chat-header {
            padding: 10px 12px;
        }

        .header-title {
            font-size: 13px;
        }

        .new-chat-btn {
            padding: 6px 12px;
            font-size: 12px;
        }

        .message {
            padding: 20px 0;
        }

        .message-wrapper {
            padding: 0 16px;
            gap: 16px;
        }

        .message-avatar {
            width: 28px;
            height: 28px;
            font-size: 12px;
        }

        .message-content {
            font-size: 15px;
        }

        .chat-input-container {
            padding: 16px 0;
        }

        .chat-input {
            padding: 0 16px;
        }

        #userInput {
            font-size: 15px;
            padding: 10px 46px 10px 14px;
        }

        #sendButton {
            width: 32px;
            height: 32px;
        }
    }

    @media (max-width: 480px) {
        .message-wrapper {
            padding: 0 12px;
            gap: 12px;
        }

        .message-avatar {
            width: 26px;
            height: 26px;
        }

        .chat-input {
            padding: 0 12px;
        }
    }