:root {
    --background-color: #fff;
    --header-bg-color: #efefef;
    --text-color: #000;
    --secondary-text-color: #262626;
    --primary-color: #005abf;
    --primary-hover-color: #004299;
    --button-bg-color: #005abf;
    --button-text-color: #fff;
    --button-hover-bg-color: #004299;
    --button-disabled-bg-color: #ccc;
    --button-disabled-text-color: #666;
    --modal-bg-color: #fff;
    --modal-border-color: #000;
    --bot-message-bg-color: #e8f1fd;
    --bot-message-text-color: #000;
    --user-message-text-color: #000;
    --user-message-bg-color: #d1d1d1;
    --input-border-color: #5a5a5a;
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
    --code-font-family: source-code-pro, Menlo, Monaco, Consolas, "Courier New", monospace;
    --box-shadow: 24px 24px 48px rgba(0, 0, 0, 0.15);
    --outline-shadow: 0 0 0 3px rgba(0, 90, 191, 0.5);
    --scroll-to-bottom-bg-color: #005abf;
    --scroll-to-bottom-bg-hover-color: #004299;
}

/* Dark Mode Variables */
body.dark {
    --background-color: #333;
    --header-bg-color: #4f4f4f;
    --text-color: #fff;
    --secondary-text-color: #ccc;
    --primary-color: #2684ff;
    --primary-hover-color: #1b4b8f;
    --button-bg-color: #0a64c5;
    --button-text-color: #fff;
    --button-hover-bg-color: #084497;
    --button-disabled-bg-color: #3a3a3a;
    --button-disabled-text-color: #999;
    --modal-bg-color: #121212;
    --modal-border-color: #fff;
    --bot-message-bg-color: #0a64c5;
    --bot-message-text-color: #fff;
    --user-message-text-color: #fff;
    --user-message-bg-color: #3a3a3a;
    --input-border-color: #a5a5a5;
    --box-shadow: 24px 24px 48px rgba(255, 255, 255, 0.15);
    --outline-shadow: 0 0 0 3px rgba(255, 255, 255, 0.5);
    --user-message-border-color: #d3d3d3;
    --bot-message-border-color: #a8c6ff;
    --scroll-to-bottom-bg-color: #3d9df4;
    --scroll-to-bottom-bg-hover-color: #2178d9;
}

/* Base Styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Screen Reader Only */
.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;
}

/* Chatbot Container */
.chatbot-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

/* Chat Header */
.chat-header {
    background-color: var(--header-bg-color);
    border-top-left-radius: 5px;
    border-top-right-radius: 5px;
    padding: 12.5px;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.chat-header-text {
    color: var(--text-color);
    font-size: 1.5em;
    font-weight: 700;
    margin: 0;
}

.chat-header-tagline {
    margin-top: 4px;
    font-size: 0.95rem;
    color: var(--secondary-text-color);
}

.header-buttons-container {
    display: flex;
    gap: 10px;
}

.icon-button {
    background-color: transparent;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    padding: 8px;
    border-radius: 5px;
    transition: background-color 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-button:hover {
    background-color: rgba(0, 0, 0, 0.1);
}

body.dark .icon-button:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.icon-button:focus {
    outline: none;
    box-shadow: var(--outline-shadow);
}

.chat-banner {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin: 1rem 1.25rem 1.5rem;
    padding: 1rem 1.25rem;
    border-radius: 12px;
    background-color: rgba(0, 90, 191, 0.08);
    border: 1px solid rgba(0, 90, 191, 0.2);
}

body.dark .chat-banner {
    background-color: rgba(61, 157, 244, 0.12);
    border-color: rgba(61, 157, 244, 0.25);
}

.beta-banner {
    font-size: 0.95rem;
    line-height: 1.45;
}

.support-banner {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 0.95rem;
}

.donate-link {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.35rem 0.85rem;
    border-radius: 999px;
    background-color: var(--primary-color);
    color: #fff;
    font-weight: 600;
    text-decoration: none;
    transition: background-color 0.2s ease, transform 0.2s ease;
}

.donate-link:hover,
.donate-link:focus-visible {
    background-color: var(--primary-hover-color);
    transform: translateY(-1px);
}

/* Chat Messages Container */
.chat-messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 0 17.5px 10px;
    scroll-behavior: smooth;
}

/* Bot Message */
.bot-message-container {
    display: flex;
    justify-content: flex-start;
    margin: 15px 0;
}

.bot-avatar-container {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #d8d8d8;
    border-radius: 50%;
    width: 10vw;
    height: 10vw;
    min-width: 30px;
    min-height: 30px;
    max-width: 50px;
    max-height: 50px;
    margin-right: 12.5px;
    flex-shrink: 0;
}

.bot-avatar-icon {
    fill: #494646;
    width: 22.5px;
    height: 22.5px;
}

.bot-message {
    background-color: var(--bot-message-bg-color);
    color: var(--bot-message-text-color);
    border-radius: 5px;
    padding: 10px 1.25em;
    max-width: 60%;
    word-wrap: break-word;
    word-break: break-word;
    position: relative;
    border: 1.5px solid transparent;
}

body.dark .bot-message {
    border: 1.5px solid var(--bot-message-border-color);
}

.bot-message p {
    margin: 0;
    line-height: 1.5;
}

.bot-message p + p {
    margin-top: 0.5em;
}

/* User Message */
.user-message-container {
    display: flex;
    justify-content: flex-end;
    margin: 15px 0;
}

.user-avatar-container {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #3d4e8d;
    border-radius: 50%;
    width: 10vw;
    height: 10vw;
    min-width: 30px;
    min-height: 30px;
    max-width: 50px;
    max-height: 50px;
    margin-left: 12.5px;
    flex-shrink: 0;
}

.user-avatar-icon {
    fill: #fff;
    width: 40%;
    height: 40%;
}

.user-message {
    background-color: var(--user-message-bg-color);
    color: var(--user-message-text-color);
    border-radius: 5px;
    padding: 10px 1.25em;
    max-width: 60%;
    word-wrap: break-word;
    word-break: break-word;
    position: relative;
    border: 1.5px solid transparent;
}

body.dark .user-message {
    border: 1.5px solid var(--user-message-border-color);
}

.user-message p {
    margin: 0;
    line-height: 1.5;
}

/* Loading Animation */
.chatbot-loader-container {
    display: flex;
    justify-content: center;
    width: 100%;
}

#chatbot-loader {
    width: 25px;
    height: 17px;
}

#chatbot-loader circle:nth-child(1) {
    animation: load 1s infinite;
}

#chatbot-loader circle:nth-child(2) {
    animation: load 1s infinite;
    animation-delay: 0.2s;
}

#chatbot-loader circle:nth-child(3) {
    animation: load 1s infinite;
    animation-delay: 0.4s;
}

@keyframes load {
    0% {
        opacity: 0;
    }
    50% {
        opacity: 1;
    }
    100% {
        opacity: 0;
    }
}

/* Scroll to Bottom Button */
.scroll-to-bottom-btn {
    position: fixed;
    bottom: 70px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--scroll-to-bottom-bg-color);
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    transition: background-color 0.3s;
    z-index: 1000;
}

.scroll-to-bottom-btn:hover {
    background-color: var(--scroll-to-bottom-bg-hover-color);
}

.scroll-to-bottom-btn:focus {
    outline: none;
    box-shadow: var(--outline-shadow);
}

.arrow-icon {
    stroke: var(--button-text-color);
    stroke-width: 3;
    stroke-linecap: round;
    stroke-linejoin: round;
    fill: none;
    width: 28px;
    height: 28px;
}

/* Chat Input Container */
.chat-input-container {
    border-top: 2px solid var(--input-border-color);
    display: flex;
    height: 60px;
}

.chat-input-form {
    display: flex;
    width: 100%;
}

.chat-input {
    flex: 1;
    background-color: var(--background-color);
    color: var(--text-color);
    border: none;
    outline: none;
    font-size: 1em;
    padding: 12.5px;
    font-family: var(--font-family);
}

.chat-input::placeholder {
    color: var(--text-color);
    opacity: 0.6;
}

.chat-input:focus {
    outline: none;
}

.chat-btn-send {
    background-color: var(--button-bg-color);
    color: var(--button-text-color);
    border: none;
    border-bottom-right-radius: 5px;
    width: 100px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.chat-btn-send:hover:not(:disabled) {
    background-color: var(--button-hover-bg-color);
}

.chat-btn-send:focus {
    outline: none;
    box-shadow: var(--outline-shadow);
}

.chat-btn-send:disabled {
    background-color: var(--button-disabled-bg-color);
    color: var(--button-disabled-text-color);
    cursor: not-allowed;
}

.send-icon {
    width: 20px;
    height: 20px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .chat-header-text {
        font-size: 1.2em;
    }

    .chat-header-tagline {
        font-size: 0.9rem;
    }

    .bot-message,
    .user-message {
        max-width: 75%;
    }

    .chat-btn-send {
        width: 80px;
    }

    .chat-banner {
        margin: 0.75rem 0.75rem 1.25rem;
    }

    .support-banner {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.4rem;
    }
}

@media (max-width: 480px) {
    .bot-message,
    .user-message {
        max-width: 85%;
        font-size: 0.9em;
    }

    .chat-input {
        font-size: 16px; /* Prevents zoom on iOS */
    }

    .chat-banner {
        padding: 0.9rem 1rem;
    }

    .donate-link {
        width: 100%;
        justify-content: center;
    }
}

/* Scrollbar Styling */
.chat-messages-container::-webkit-scrollbar {
    width: 8px;
}

.chat-messages-container::-webkit-scrollbar-track {
    background: var(--background-color);
}

.chat-messages-container::-webkit-scrollbar-thumb {
    background: var(--input-border-color);
    border-radius: 4px;
}

.chat-messages-container::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}

/* Error Message */
.error-message {
    background-color: #ffebee;
    color: #c62828;
    padding: 10px 1.25em;
    border-radius: 5px;
    border-left: 4px solid #c62828;
}

body.dark .error-message {
    background-color: #4a0000;
    color: #ff8a80;
    border-left-color: #ff8a80;
}

/* Code blocks in messages */
.bot-message code,
.user-message code {
    background-color: rgba(0, 0, 0, 0.1);
    padding: 2px 6px;
    border-radius: 3px;
    font-family: var(--code-font-family);
    font-size: 0.9em;
}

body.dark .bot-message code,
body.dark .user-message code {
    background-color: rgba(255, 255, 255, 0.1);
}

.bot-message pre,
.user-message pre {
    background-color: rgba(0, 0, 0, 0.05);
    padding: 10px;
    border-radius: 5px;
    overflow-x: auto;
    margin: 0.5em 0;
}

body.dark .bot-message pre,
body.dark .user-message pre {
    background-color: rgba(255, 255, 255, 0.05);
}