:root {
        --philips-blue: #0b5ed7;
        --philips-blue-alt: #3c7bba;
        --philips-white: #ffffff;
        --background: #808080;
        --philips-logo2-darkest-blue: #004C79;
        --philips-logo2-lightest-blue: #327ABA;
    }

    html, body {
        height: 100%;
        margin: 0;
        font-family: "Segoe UI", Arial, sans-serif;
        background: var(--background);
        overflow: hidden;
    }

    /* FULL PAGE WRAPPER */
    .app-container {
        height: 100vh;
        max-width: 450px;
        width: 100%;
        display: flex;
        flex-direction: column;
        align-items: center;

        /* ❌ REMOVE CENTERING */
/*        justify-content: flex-start;     */
        margin: 0 auto;

        background-color: var(--philips-logo2-darkest-blue);
    }

    /* CONTENT WRAPPER (THIS is your fixed width column) */
    .main-content {
        max-width: 450px;
        width: 100%;
        height: 100%;
        display: flex;
        flex-direction: column;
        align-items: center;

        /* IMPORTANT for flex children */
        min-height: 0;
    }

    /* BIG LOGO */
    .logo-large {
        height: 80px;
        width: auto;
        margin: 20px 0;
        flex-shrink: 0;
    }

    /* CHAT WRAPPER TAKES REMAINING HEIGHT */
    .chat-wrapper {
        width: 100%;

        /* KEY FIX */
        flex: 1;
        min-height: 0;

        background: var(--philips-white);
/*         border-radius: 16px; */
        /* box-shadow: 0 10px 30px rgba(0,0,0,0.1); */

        display: flex;
        flex-direction: column;
        overflow: hidden;
    }

    /* HEADER FIXED HEIGHT */
    .chat-header {
        background: var(--philips-blue);
        color: white;
        padding: 16px;
        text-align: center;
        font-size: 18px;
        font-weight: 600;
        flex-shrink: 0;
    }

    /* CHAT BODY FILLS EVERYTHING */
    .chat-body {
        flex: 1;
        min-height: 0;
        display: flex;
    }

    .chat-body iframe {
        flex: 1;
        width: 100%;
        height: 100%;
        border: none;
    }

    /* MOBILE */
    @media (max-width: 450px) {

    .main-content {
        width: 100%;
        max-width: 450px;
        padding: 0 12px;
    }

    .chat-wrapper {
        width: 100%;
        max-width: 450px;
    }

    .logo-large {
        height: 40px;
    }
}