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

:root {
    --primary-bg: #fff;
    --primary-text: #333;
    --secondary-bg: #f5f5f5;
    --border-color: #e0e0e0;
    --user-msg-bg: #007bff;
    --user-msg-text: #fff;
    --assistant-msg-bg: #e9ecef;
    --assistant-msg-text: #333;
}

@media (prefers-color-scheme: dark) {
    :root {
        --primary-bg: #1e1e1e;
        --primary-text: #f0f0f0;
        --secondary-bg: #2d2d2d;
        --border-color: #404040;
        --user-msg-bg: #0d47a1;
        --user-msg-text: #fff;
        --assistant-msg-bg: #404040;
        --assistant-msg-text: #f0f0f0;
    }
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--primary-bg);
    color: var(--primary-text);
    height: 100vh;
    display: flex;
}

.container {
    display: flex;
    flex-direction: column;
    width: 100%;
    height: 100vh;
}

header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--secondary-bg);
    text-align: center;
}

header h1 {
    font-size: 1.8rem;
    margin-bottom: 0.25rem;
}

header p {
    font-size: 0.9rem;
    opacity: 0.7;
}

main {
    display: flex;
    flex-direction: column;
    flex: 1;
    overflow: hidden;
}

.chat-container {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    display: flex;
    flex-direction: column;
}

#messages {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.message {
    display: flex;
    margin-bottom: 0.5rem;
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message.user {
    justify-content: flex-end;
}

.message.assistant {
    justify-content: flex-start;
}

.message-content {
    max-width: 70%;
    padding: 0.75rem 1rem;
    border-radius: 0.75rem;
    word-wrap: break-word;
    overflow-x: auto;
}

/* Markdown element styling */
.message.assistant .message-content h1,
.message.assistant .message-content h2,
.message.assistant .message-content h3,
.message.assistant .message-content h4,
.message.assistant .message-content h5,
.message.assistant .message-content h6 {
    margin-top: 1rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.message.assistant .message-content h1 {
    font-size: 1.6rem;
    border-bottom: 2px solid currentColor;
    padding-bottom: 0.5rem;
    opacity: 0.9;
}

.message.assistant .message-content h2 {
    font-size: 1.4rem;
    opacity: 0.9;
}

.message.assistant .message-content h3 {
    font-size: 1.2rem;
}

.message.assistant .message-content h4,
.message.assistant .message-content h5,
.message.assistant .message-content h6 {
    font-size: 1rem;
}

.message.assistant .message-content ul,
.message.assistant .message-content ol {
    margin: 0.5rem 0;
    padding-left: 2rem;
}

.message.assistant .message-content li {
    margin: 0.25rem 0;
}

.message.assistant .message-content code {
    background-color: var(--secondary-bg);
    padding: 0.2rem 0.4rem;
    border-radius: 0.3rem;
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 0.9em;
}

.message.assistant .message-content pre {
    background-color: var(--secondary-bg);
    padding: 1rem;
    border-radius: 0.5rem;
    overflow-x: auto;
    margin: 0.5rem 0;
    border-left: 3px solid #007bff;
}

.message.assistant .message-content pre code {
    background-color: transparent;
    padding: 0;
    border-radius: 0;
    font-size: 0.85em;
    line-height: 1.4;
}

.message.assistant .message-content blockquote {
    border-left: 4px solid #007bff;
    padding-left: 1rem;
    margin: 0.5rem 0;
    opacity: 0.85;
    font-style: italic;
}

.message.assistant .message-content strong {
    font-weight: 600;
}

.message.assistant .message-content em {
    font-style: italic;
}

.message.assistant .message-content p {
    margin: 0.5rem 0;
    line-height: 1.5;
}

.message.assistant .message-content a {
    color: #007bff;
    text-decoration: none;
}

.message.assistant .message-content a:hover {
    text-decoration: underline;
}

.message.assistant .message-content hr {
    border: none;
    border-top: 1px solid currentColor;
    margin: 1rem 0;
    opacity: 0.3;
}

.message.user .message-content {
    background-color: var(--user-msg-bg);
    color: var(--user-msg-text);
}

.message.assistant .message-content {
    background-color: var(--assistant-msg-bg);
    color: var(--assistant-msg-text);
}

.message.loading .message-content {
    font-style: italic;
    opacity: 0.7;
}

.input-area {
    padding: 1rem;
    border-top: 1px solid var(--border-color);
    background-color: var(--secondary-bg);
}

#chat-form {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.input-group {
    display: flex;
    gap: 0.5rem;
}

#message-input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 1rem;
    background-color: var(--primary-bg);
    color: var(--primary-text);
}

#message-input:focus {
    outline: none;
    border-color: #007bff;
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25);
}

.image-btn {
    padding: 0.75rem 1rem;
    background-color: var(--secondary-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    cursor: pointer;
    font-size: 1.2rem;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.image-btn:hover {
    background-color: #007bff;
    color: white;
    border-color: #007bff;
}

#chat-form button[type="submit"] {
    padding: 0.75rem 1.5rem;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

#chat-form button[type="submit"]:hover {
    background-color: #0056b3;
}

#chat-form button[type="submit"]:active {
    transform: scale(0.98);
}

.image-preview {
    position: relative;
    width: 80px;
    height: 80px;
    margin-bottom: 0.5rem;
}

.image-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
}

.remove-btn {
    position: absolute;
    top: -8px;
    right: -8px;
    width: 24px;
    height: 24px;
    padding: 0;
    background-color: #dc3545;
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2rem;
    line-height: 1;
    transition: background-color 0.2s;
}

.remove-btn:hover {
    background-color: #c82333;
}

.controls {
    display: flex;
    gap: 1rem;
    align-items: center;
    justify-content: space-between;
}

.controls button {
    padding: 0.5rem 1rem;
    background-color: transparent;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--primary-text);
    transition: all 0.2s;
}

.controls button:hover {
    background-color: var(--primary-bg);
    border-color: #007bff;
}

.info {
    font-size: 0.85rem;
    opacity: 0.6;
}

@media (max-width: 768px) {
    .message-content {
        max-width: 85%;
    }

    #chat-form {
        flex-direction: column;
    }

    .controls {
        flex-direction: column;
        align-items: stretch;
    }

    .controls button {
        width: 100%;
    }
}