:root {
    --bg-primary: #0D1117;
    --bg-secondary: #161B22;
    --bg-tertiary: #21262D;
    --border-primary: #30363D;
    --text-primary: #C9D1D9;
    --text-secondary: #8B949E;
    --accent-user: #2F81F7;
    --accent-user-hover: #58A6FF;
    --font-family-sans: 'Inter', sans-serif;
    --font-family-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, Courier, monospace;
}

body {
    font-family: var(--font-family-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    padding: 1rem;
}

.chat-container {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: 0.75rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    width: 100%;
    max-width: 800px;
    height: 90vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.chat-header {
    padding: 0.75rem 1.5rem;
    border-bottom: 1px solid var(--border-primary);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
}

.chat-header h1 {
    font-size: 1.25rem;
    font-weight: 600;
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

#chat-window {
    flex-grow: 1;
    padding: 1.5rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.message-bubble {
    max-width: 75%;
    padding: 0.75rem 1.25rem;
    border-radius: 1.25rem;
    line-height: 1.6;
    word-wrap: break-word;
}

.message-bubble.user {
    background-color: var(--accent-user);
    color: white;
    align-self: flex-end;
    border-bottom-right-radius: 0.375rem;
}

.message-bubble.bot {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    align-self: flex-start;
    border-bottom-left-radius: 0.375rem;
}

.bot .content-block {
    border-top: 1px solid var(--border-primary);
    margin-top: 0.75rem;
    padding-top: 0.75rem;
}

.bot .content-block:first-child {
    margin-top: 0;
    padding-top: 0;
    border-top: none;
}

.bot h3 {
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.bot pre {
    font-family: var(--font-family-mono);
    font-size: 0.9rem;
    background-color: var(--bg-primary);
    padding: 0.75rem;
    border-radius: 0.5rem;
    white-space: pre-wrap;
    word-break: break-all;
}

.typing-indicator {
    display: flex;
    gap: 0.25rem;
    align-items: center;
    padding: 0.75rem 1.25rem;
}
.typing-indicator span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--text-secondary);
    animation: bounce 1.4s infinite ease-in-out both;
}
.typing-indicator span:nth-child(1) { animation-delay: -0.32s; }
.typing-indicator span:nth-child(2) { animation-delay: -0.16s; }
@keyframes bounce {
    0%, 80%, 100% { transform: scale(0); }
    40% { transform: scale(1.0); }
}


.chat-input-area {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-primary);
    display: flex;
    gap: 1rem;
    align-items: center;
}

.chat-input-area textarea {
    flex-grow: 1;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    border-radius: 1.5rem;
    padding: 0.75rem 1.25rem;
    color: var(--text-primary);
    resize: none;
    outline: none;
    transition: all 0.2s;
}
.chat-input-area textarea:focus {
    border-color: var(--accent-user);
    box-shadow: 0 0 0 3px rgba(47, 129, 247, 0.3);
}

.btn-send {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: var(--accent-user);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
}
.btn-send:hover:not(:disabled) {
    background-color: var(--accent-user-hover);
}
.btn-send:disabled {
    background-color: var(--text-secondary);
    cursor: not-allowed;
}
.btn-send svg {
    width: 24px;
    height: 24px;
}

/* Utility for session management buttons */
.btn-icon {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: all 0.2s;
}
.btn-icon:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}
.btn-icon svg { width: 20px; height: 20px; }

/* Hiding original elements not needed in chat UI */
#historyContainer, #rawResponseDisplay, #getHistoryBtn { display: none !important; }