:root {
    --background: #111827; /* gray-900 */
    --card-bg: #1f2937; /* gray-800 */
    --border: #374151; /* gray-700 */
    --input-bg: #374151; /* gray-700 */
    --text-primary: #f9fafb; /* gray-50 */
    --text-secondary: #9ca3af; /* gray-400 */
    --accent: #3b82f6; /* blue-500 */
    --accent-hover: #2563eb; /* blue-600 */
}
body {
    font-family: 'Inter', sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.7); }
    70% { box-shadow: 0 0 0 10px rgba(239, 68, 68, 0); }
    100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0); }
}
.spinner {
    border: 3px solid rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    border-top-color: #fff;
    width: 20px;
    height: 20px;
    animation: spin 0.8s ease-in-out infinite;
}
.btn .btn-text.hidden + .spinner { display: block !important; }

.tool-log-container {
    max-width: 100%;
    padding: 10px 16px;
    border-radius: 12px;
    word-wrap: break-word;
    line-height: 1.5;
    background-color: transparent;
    color: var(--text-secondary);
    border: 1px dashed var(--border);
    font-size: 0.9em;
    margin-top: 8px;
    margin-bottom: 8px;
}

.markdown-content p { margin-bottom: 0.5rem; }
.markdown-content p:last-child { margin-bottom: 0; }
.markdown-content ul, .markdown-content ol { margin-left: 1.25rem; margin-top: 0.5rem; margin-bottom: 0.5rem; }
.markdown-content li { margin-bottom: 0.25rem; }
.markdown-content code {
    background-color: var(--background);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
    font-family: 'Courier New', Courier, monospace;
}
.markdown-content pre {
    background-color: var(--background);
    padding: 0.75rem;
    border-radius: 8px;
    margin: 0.75rem 0;
    overflow-x: auto;
    white-space: pre-wrap;
    position: relative; /* For copy button positioning */
}
.markdown-content pre code { padding: 0; background-color: transparent; }
.markdown-content a { color: var(--accent); text-decoration: underline; }
.markdown-content strong { font-weight: 700; }

.page { display: none; animation: fadeIn 0.5s ease-in-out; }
.page.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

.lab-card { transition: transform 0.3s ease, box-shadow 0.3s ease; }
.lab-card:hover { transform: translateY(-5px); box-shadow: 0 10px 25px -5px rgba(0,0,0,0.3), 0 8px 10px -6px rgba(0,0,0,0.3); }

.nav-link { color: var(--text-secondary); }
.nav-link.active { background-color: var(--accent); color: var(--text-primary); }
.nav-link:not(.active):hover { background-color: rgba(255,255,255,0.05); }

#chat-container::-webkit-scrollbar {
    width: 8px;
}
#chat-container::-webkit-scrollbar-track {
    background: transparent;
}
#chat-container::-webkit-scrollbar-thumb {
    background-color: var(--border);
    border-radius: 20px;
    border: 3px solid transparent;
    background-clip: content-box;
}
#chat-container::-webkit-scrollbar-thumb:hover {
    background-color: #4b5563;
}

.tab-btn { background-color: transparent; color: var(--text-secondary); }
.tab-btn.active { background-color: var(--accent); color: var(--text-primary); }
.tab-content { display: none; }
.tab-content.active { display: block; }

#itt-file-input { display: none; }
#itt-file-label {
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px dashed var(--border);
    padding: 1rem;
    border-radius: 0.75rem;
    transition: all 0.2s;
    min-height: 120px;
}
#itt-file-label:hover { border-color: var(--accent); background-color: rgba(59, 130, 246, 0.1); }

.mode-btn { background-color: transparent; color: var(--text-secondary); }
.mode-btn.active { background-color: var(--accent); color: var(--text-primary); }

.thinking-process {
    border-top: 1px solid var(--border);
    margin-top: 12px;
    padding-top: 12px;
}

.copy-code-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    background-color: var(--input-bg);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 0.8em;
    font-weight: 500;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.2s, background-color 0.2s;
}

.markdown-content pre:hover .copy-code-btn {
    opacity: 1;
}

.copy-code-btn:hover {
    background-color: #4b5563; /* gray-600 */
    color: var(--text-primary);
}

.copy-code-btn.copied {
    background-color: #166534; /* green-800 */
    color: #dcfce7; /* green-100 */
    border-color: #15803d; /* green-700 */
}

/* Chat Styles */
.message-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.message-bubble {
    max-width: 85%;
    padding: 10px 16px;
    border-radius: 18px;
    word-wrap: break-word;
    line-height: 1.5;
}

.user-message {
    background-color: var(--accent);
    color: var(--text-primary);
    align-self: flex-end;
    border-bottom-right-radius: 4px;
}

.ai-message {
    background-color: var(--input-bg);
    color: var(--text-primary);
    align-self: flex-start;
    border-bottom-left-radius: 4px;
    display: flex;
    align-items: flex-start;
    gap: 10px;
}
.ai-message .avatar {
    width: 28px;
    height: 28px;
    flex-shrink: 0;
    border-radius: 50%;
    background-color: var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 4px;
}
.ai-message .avatar svg {
    width: 16px;
    height: 16px;
    color: var(--text-secondary);
}
.ai-message-content {
    flex-grow: 1;
}

#mic-btn.recording {
    color: #ef4444; /* red-500 */
    background-color: rgba(239, 68, 68, 0.1);
    animation: pulse 1.5s infinite;
}

.welcome-panel {
    background-color: rgba(59, 130, 246, 0.1);
    border: 1px solid var(--accent);
    border-radius: 12px;
    padding: 16px;
    margin: 8px 4px;
    display: flex;
    gap: 12px;
    align-items: flex-start;
}
.welcome-panel .icon {
    flex-shrink: 0;
    color: var(--accent);
}
.welcome-panel-content {
    flex-grow: 1;
    font-size: 0.95em;
    color: var(--text-secondary);
}
.welcome-panel-content p {
    margin-bottom: 0;
}
.welcome-panel-content strong {
    color: var(--text-primary);
    font-weight: 600;
}