#prep-chat-launcher, #prep-chat-fallback {
    position: fixed;
    right: max(20px, env(safe-area-inset-right));
    bottom: max(20px, env(safe-area-inset-bottom));
    z-index: 999;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    max-width: calc(100vw - 40px);
    box-sizing: border-box;
    padding: 12px 20px;
    border: 2px solid #fff;
    border-radius: 28px;
    background: #1d4767;
    color: #fff;
    box-shadow: 0 3px 14px rgb(0 0 0 / 20%);
    font: 600 15px/1.4 system-ui, sans-serif;
    text-decoration: none;
    cursor: pointer;
}
#prep-chat-launcher:hover, #prep-chat-fallback:hover { background: #12354f; }
#prep-chat-launcher:focus-visible, #prep-chat-fallback:focus-visible { outline: 3px solid #e5826b; outline-offset: 3px; }
#prep-chat-launcher[aria-busy="true"] { cursor: progress; }
#prep-chat-launcher[hidden], #prep-chat-fallback[hidden] { display: none; }
#prep-chat-status {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
}