* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    width: 100%;
    height: 100%;
    font-family: Arial, sans-serif;
    background: #f2f2f2;
}


/* Login / username screens */

.container {
    width: 90%;
    max-width: 400px;
    margin: 100px auto;
    padding: 30px;
    background: white;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.15);
}

.container h1 {
    margin-top: 0;
}

.container input[type="text"] {
    width: 100%;
    padding: 12px;
    margin: 10px 0;
    border: 1px solid #ccc;
    border-radius: 8px;
    font-size: 16px;
}

.container input[type="color"] {
    width: 70px;
    height: 45px;
    padding: 3px;
    margin: 5px 0 15px;
    border: 1px solid #ccc;
    border-radius: 8px;
    cursor: pointer;
}

.container button {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    background: #4285F4;
    color: white;
}

.container button:hover {
    opacity: 0.9;
}

#errorMessage,
#usernameError {
    color: red;
    min-height: 20px;
}


/* =========================
   CHAT
   ========================= */

.chatContainer {
    width: 90%;
    max-width: 700px;

    height: 80vh;
    max-height: 80vh;

    margin: 5vh auto;
    padding: 20px;

    background: white;
    border-radius: 15px;

    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.15);

    display: flex;
    flex-direction: column;

    overflow: hidden;
}


/* Chat title */

.chatContainer h1 {
    margin: 0 0 15px 0;
    flex: 0 0 auto;
}


/* =========================
   MESSAGE AREA
   ========================= */

#messages {
    width: 100%;

    flex: 1 1 0;
    min-height: 0;

    overflow-y: auto;
    overflow-x: hidden;

    padding: 10px;

    border: 1px solid #ddd;
    border-radius: 10px;

    margin: 0 0 10px 0;

    /* Makes sure the message area itself scrolls */
    overscroll-behavior: contain;
}


/* Individual messages */

.message {
    display: block;

    width: 100%;

    padding: 8px 12px;
    margin: 6px 0;

    background: #f0f0f0;

    border-radius: 8px;

    word-wrap: break-word;
    overflow-wrap: anywhere;

    flex-shrink: 0;
}


/* =========================
   MESSAGE INPUT
   ========================= */

.messageBox {
    width: 100%;

    display: flex;

    gap: 10px;

    flex: 0 0 auto;
}

.messageBox input {
    flex: 1 1 auto;

    min-width: 0;

    padding: 12px;

    border: 1px solid #ccc;
    border-radius: 8px;

    font-size: 16px;
}

.messageBox button {
    flex: 0 0 auto;

    padding: 12px 20px;

    border: none;
    border-radius: 8px;

    font-size: 16px;

    cursor: pointer;

    background: #4285F4;
    color: white;
}

.messageBox button:hover {
    opacity: 0.9;
}


/* =========================
   MOBILE
   ========================= */

@media (max-width: 600px) {

    .chatContainer {
        width: 95%;
        height: 90vh;
        max-height: 90vh;

        margin: 5vh auto;

        padding: 15px;
    }

    .messageBox {
        gap: 5px;
    }

    .messageBox button {
        padding: 12px 15px;
    }
}