/* ========== Variables ========== */
:root {
    /* Color palette */
    --color-green: #2ecc71;
    --color-green-dark: #27ae60;
    --color-white: #ffffff;
    --color-gray-100: #f5f5f5;
    --color-gray-200: #e0e0e0;
    --color-gray-600: #757575;
    --color-brown: #8f6e57;
    --color-brown-dark: #6F4E37;
    --color-accent: #e7dfb1;

    /* Dimensions */
    --chatbot-width: min(380px, 100%);
    --chatbot-height: min(480px, 100%);
    --icon-size: 50px;
    --icon-inner-size: 25px;

    /* Spacing */
    --spacing-xs: 3px;
    --spacing-sm: 8px;
    --spacing-md: 10px;
    --spacing-lg: 15px;
    --spacing-xl: 20px;

    /* Typography */
    --font-size-xs: 14px;
    --font-size-sm: 16px;
    --font-size-md: 1.5rem;

    /* Effects */
    --border-radius-sm: 3px;
    --border-radius-md: 10px;
    --border-radius-lg: 12px;
    --border-radius-xl: 20px;
    --border-radius-full: 50%;
    --box-shadow-sm: 0 3px 10px rgba(0, 0, 0, 0.1);
    --box-shadow-md: 0 5px 15px rgba(0, 0, 0, 0.1);
    --transition-duration: 0.3s;
}

/* ========== Accessibility ========== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* ========== Base Styles ========== */
body {
    font-size: 1.5em;
    overflow-x: hidden;
}

p {
    font-size: var(--font-size-md);
}

.blockquote {
    padding-top: 1.5rem;
}

.btn-group.dropup {
    position: fixed;
    left: var(--spacing-xs);
    bottom: var(--spacing-xs);
    z-index: 999;
}

/* ========== Chatbot Container ========== */
.chatbot-container {
    position: fixed;
    right: var(--spacing-xl);
    bottom: var(--spacing-xl);
    width: 0;
    height: 0;
    background-color: var(--color-white);
    border-radius: var(--border-radius-md);
    box-shadow: var(--box-shadow-md);
    overflow: hidden;
    opacity: 0;
    display: flex;
    flex-direction: column;
    z-index: 1000;
    transition:
        width var(--transition-duration),
        height var(--transition-duration),
        opacity var(--transition-duration);
}

.chatbot-container.expanded {
    width: var(--chatbot-width);
    height: var(--chatbot-height);
    opacity: 1;
}

/* Internal elements fade in animation */
.chatbot-container .chat-header,
.chatbot-container .chat-window,
.chatbot-container .chat-form {
    opacity: 0;
    transition: opacity var(--transition-duration) 0.2s;
}

.chatbot-container.expanded .chat-header,
.chatbot-container.expanded .chat-window,
.chatbot-container.expanded .chat-form {
    opacity: 1;
}

/* ========== Chat Header ========== */
.chat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: var(--color-brown-dark);
    color: var(--color-white);
    border-top-left-radius: var(--border-radius-md);
    border-top-right-radius: var(--border-radius-md);
}

.chat-header h3 {
    margin: 0;
    font-size: var(--font-size-sm);
}

/* ============= Chat Itro Panel ========== */
.chat-intro {
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-xl) var(--spacing-md);
    border-radius: var(--border-radius-lg);
    word-wrap: break-word;
    font-size: var(--font-size-sm);
    color: #333;
    align-self: center;
    margin-right: auto;
    margin-left: auto;
    border-bottom-left-radius: 4px;
    text-align: center;

    .title {
        font-size: 1.2rem;
        margin-bottom: var(--spacing-sm);
    }

    .description {
        font-size: var(--font-size-xs);
        margin-bottom: var(--spacing-lg);
    }

    button {
        border: none;
        background-color: var(--color-gray-200);
        color: #333;
        font-size: var(--font-size-xs);
        padding: 2px 15px;
        margin-bottom: 5px;
        border-radius: 1rem;

        &:hover {
            background-color: var(--color-accent);
        }
    }
}

/* ========== Icon Button ========== */
.icon-button {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-white);
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-button:hover {
    opacity: 0.8;
}

.icon-button:focus {
    outline: 2px solid rgba(255, 255, 255, 0.5);
    border-radius: var(--border-radius-sm);
}

/* ========== Chat Messages ========== */
.message {
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-lg);
    max-width: 80%;
    word-wrap: break-word;
    font-size: var(--font-size-xs);
}

.user {
    background-color: var(--color-brown);
    color: var(--color-white);
    align-self: flex-end;
    margin-left: auto;
    border-bottom-right-radius: 4px;
}

.bot, .system, .model {
    background-color: var(--color-accent);
    color: #333;
    align-self: flex-start;
    margin-right: auto;
    border-bottom-left-radius: 4px;
}

.message p {
    margin: 0 0 var(--spacing-sm) 0;
    font-size: var(--font-size-xs);
}

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

/* ========== Chat Window ========== */
.chat-window {
    flex: 1;
    padding: var(--spacing-lg);
    overflow-y: auto;
    background-color: var(--color-gray-100);
    display: flex;
    flex-direction: column;
}

/* ========== Chat Form ========== */
.chat-form {
    display: flex;
    padding: var(--spacing-md);
    background-color: var(--color-white);
    border-top: 1px solid var(--color-gray-200);
}

.chat-form input {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-gray-600);
    border-radius: var(--border-radius-xl);
    font-size: var(--font-size-xs);
    outline: none;
}

.chat-form input:focus {
    border-color: var(--color-brown-dark);
}

.chat-form button {
    margin-left: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: var(--color-brown-dark);
    color: var(--color-white);
    border: none;
    border-radius: var(--border-radius-xl);
    cursor: pointer;
    font-size: var(--font-size-xs);
    transition: background-color 0.2s;
}

.chat-form button:hover {
    background-color: var(--color-brown-dark);
}

.chat-form button:focus {
    outline: 2px solid var(--color-brown-dark);
    outline-offset: 2px;
}

/* ========== Chatbot Toggle Button ========== */
.bot-icon-container {
    position: fixed;
    right: var(--spacing-xl);
    bottom: var(--spacing-xl);
    width: var(--icon-size);
    height: var(--icon-size);
    border-radius: var(--border-radius-full);
    background-color: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--box-shadow-sm);
    border: 1px solid var(--color-green);
    z-index: 999;
    transition: background-color 0.2s;
}

.bot-icon-container:hover {
    background-color: var(--color-green);
}

.bot-icon-container:focus {
    outline: 2px solid var(--color-green);
    outline-offset: 2px;
}

.bot-icon {
    width: var(--icon-inner-size);
    height: var(--icon-inner-size);
    color: var(--color-green);
    transition: color 0.2s;
}

.bot-icon-container:hover .bot-icon {
    color: var(--color-white);
}

/* Hide toggle button when chatbot is expanded */
.chatbot-container.expanded+.bot-icon-container {
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s, visibility 0.2s;
}