:root {
    --user-message-bg: #0056b3;
    --bot-message-bg: #2c2c2c;
    --text-color: #e0e0e0;
    --input-bg: #333333;
    --input-text: #ffffff;
}

body {
    background-color: #1a1a1a;
    color: var(--text-color);
}

.chat-container {
    height: 70vh;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    background-color: #242424;
    border: 1px solid #3a3a3a;
}

.message {
    margin-bottom: 15px;
    padding: 10px;
    border-radius: 10px;
    max-width: 80%;
    opacity: 1;
    transform: none;
}

/* Fade/slide-in is purely decorative — skip it entirely for users who've
   asked the OS for reduced motion, per WCAG 2.3.3. */
@media (prefers-reduced-motion: no-preference) {
    .message {
        opacity: 0;
        transform: translateY(20px);
        transition: opacity 0.5s ease, transform 0.5s ease;
    }

    .message.show {
        opacity: 1;
        transform: translateY(0);
    }
}

.user-message {
    background-color: var(--user-message-bg);
    color: white;
    align-self: flex-end;
}

.bot-message {
    background-color: var(--bot-message-bg);
    color: var(--text-color);
    align-self: flex-start;
}

.typing-indicator {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
}

.dot {
    width: 8px;
    height: 8px;
    background-color: #b0b0b0;
    border-radius: 50%;
    margin: 0 3px;
}

@media (prefers-reduced-motion: no-preference) {
    .dot {
        animation: bounce 1.3s linear infinite;
    }

    .dot:nth-of-type(2) {
        animation-delay: -1.1s;
    }

    .dot:nth-of-type(3) {
        animation-delay: -0.9s;
    }
}

@keyframes bounce {

    0%,
    60%,
    100% {
        transform: translateY(0);
    }

    30% {
        transform: translateY(-10px);
    }
}

.sources-toggle .bi {
    transition: transform 0.2s ease-in-out;
}

.sources-toggle[aria-expanded="true"] .bi {
    transform: rotate(180deg);
}

.sources-toggle[aria-expanded="true"] .toggle-text {
    content: "Hide Sources";
}

/* Form input styling */
.form-control {
    background-color: var(--input-bg);
    color: var(--input-text);
    border-color: #4a4a4a;
}

.form-control:focus {
    background-color: var(--input-bg);
    color: var(--input-text);
    border-color: #6a6a6a;
    box-shadow: 0 0 0 0.2rem rgba(255, 255, 255, 0.25);
}

/* Button styling */
.btn-primary {
    background-color: var(--user-message-bg);
    border-color: var(--user-message-bg);
}

.btn-primary:hover,
.btn-primary:focus {
    background-color: #0062cc;
    border-color: #005cbf;
}

/* Sources toggle button */
.btn-outline-secondary {
    color: #b0b0b0;
    border-color: #b0b0b0;
}

.btn-outline-secondary:hover,
.btn-outline-secondary:focus {
    color: #ffffff;
    background-color: #4a4a4a;
    border-color: #b0b0b0;
}

/* Listen/Stop (read-aloud) button while audio is playing */
.tts-toggle--playing {
    color: #ffffff;
    background-color: var(--user-message-bg);
    border-color: var(--user-message-bg);
}

/* Starter-prompt buttons in the initial greeting */
.starter-prompts {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.75rem;
}