:root {
    --bg-color: #1e1e1e;
    --text-color: #ffffff;
    --border-color: #3c3c3c;
    --primary-color: #007acc;
    --primary-hover-color: #005a9e;
    --secondary-color: #2d2d2d;
    --chat-mentor-bg: #2c3e50;
    --chat-user-bg: #3498db;
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-family);
    padding: 20px;
    line-height: 1.6;
}

h3, #task-container, #task-toggle {
    flex-shrink: 0;
}

.container {
    display: flex;
    gap: 20px;
    height: calc(100vh - 50px);
}

.column {
    flex-grow: 0;
    flex-shrink: 0;
    flex-basis: 50%;
    max-width: 50%;
    overflow: auto;
    display: flex;
    flex-direction: column;
}

h2 {
    margin-bottom: 10px;
}

button, .check-code-button {
    background-color: var(--primary-color);
    color: var(--text-color);
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

button:hover, .check-code-button:hover {
    background-color: var(--primary-hover-color);
}

.check-code-button {
    position: absolute;
    bottom: 55px;
    left: 10px;
    z-index: 10;
}

#chat-container, #task-container {
    background-color: var(--secondary-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px;
    color: #d4d4d4;
    font-size: 20px;
    display: flex;
    flex-direction: column;
}

#chat-container {
    height: 100%;
    min-height: 300px;
    position: relative;
}

#task-container {
    transition: max-height 0.2s ease-out;
    height: auto;
    padding-top: 5px;
    padding-bottom: 5px;
    overflow: auto;
}

#task-container pre {
    white-space: pre-wrap;
    word-wrap: break-word;
    font-weight: bold;
    border-radius: 5px;
    max-width: 100%;
}

#chat-messages {
    flex-grow: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    margin-bottom: 40px;
}

#code, codapi-status, codapi-output a[href="#close"], a[href="#edit"] {
    display: none;
}

codapi-snippet {
    padding-top: 10px;
}

#playground {
    flex-grow: 0;
    flex-shrink: 1;
    min-height: 250px;
    width: 100%;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
}

#task-container {
    flex-grow: 2;
    flex-shrink: 1;
}

.cm-editor {
    height: 100%;
    width: 100%;
    font-size: 18px;
}

.cm-scroller {
    overflow: auto;
}

.cm-content {
    font-family: 'Courier New', Courier, monospace;
}

codapi-output {
    display: block;
    margin-top: 10px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
}

codapi-output pre code {
    font-family: 'Courier New', Courier, monospace;
    background-color: transparent;
    white-space: pre-wrap;
}

#chat-input {
    display: flex;
    margin-top: 10px;
    margin-right: 80px;
    position: relative;
    z-index: 5;
}

#user-input {
    flex-grow: 1;
    margin-right: 10px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-color);
    color: var(--text-color);
    padding: 5px;
}

.message {
    max-width: 80%;
    margin-bottom: 10px;
    padding: 8px;
    border-radius: 10px;
}

.mentor-message {
    align-self: flex-start;
    background-color: var(--chat-mentor-bg);
    white-space: pre-line;
}

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

/* Responsive design */
@media (max-width: 768px) {
    .container {
        flex-direction: column;
        height: auto;
        min-height: calc(100vh);
    }

    #task-container pre {
        font-size: 16px;
    }

    .column {
        flex-basis: 100%;
        max-width: 100%;
        width: 100%;
    }

    .collapsible-arrows {
        font-size: 1.2em;
        padding: 8px 0;
        border-radius: 0 0 8px 8px;
    }
}

#logo-container {
    position: absolute;
    top: 20px;
    right: 20px;
    z-index: 100;
}

#logo-link {
    display: block;
}

#logo {
    width: 150px;
    height: auto;
}

.message .cm-editor {
    height: auto;
    max-height: 300px;
    overflow: auto;
    margin-top: 10px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
}

#task-container.collapsed {
    max-height: 0;
    padding: 0;
    margin: 0;
    border: none;
}

#task-container.collapsed pre {
    margin: 0;
    padding: 0;
    border: none;
}

.collapsible-arrows {
    cursor: pointer;
    text-align: center;
    user-select: none;
    margin-top: 5px;
}

.collapsible-arrows::after {
    content: '˄˄˄';
    font-size: 0.8em;
}

.collapsible-arrows.collapsed::after {
    content: '˅˅˅';
}

#language-container {
    position: absolute;
    top: 20px;
    right: 190px;
    z-index: 100;
    display: flex;
    gap: 10px;
}

.language-flag {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    transition: transform 0.2s;
    width: 30px;
    height: 20px;
    overflow: hidden;
}

.language-flag img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.language-flag:hover {
    transform: scale(1.1);
}

.language-flag.active {
    box-shadow: 0 0 0 2px var(--primary-color);
}

.grecaptcha-badge {
    z-index: 9;
}

.task-completed-banner {
    background-color: #4CAF50;
    color: white;
    text-align: center;
    padding: 15px;
    font-size: 1.2em;
    position: fixed;
    bottom: 0;
    width: 80%;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    animation: slideUp 0.5s ease-out;
}

@keyframes slideUp {
    from {
        transform: translate(-50%, 100%);
    }
    to {
        transform: translate(-50%, 0);
    }
}

.task-completed-banner.slide-down {
    animation: slideDown 0.5s ease-in forwards;
}

@keyframes slideDown {
    from {
        transform: translate(-50%, 0);
    }
    to {
        transform: translate(-50%, 100%);
    }
}