/* --- CSS Variables for Theming --- */
:root {
    --bg-primary: #171624;
    --bg-secondary: #1D1C2D;
    --bg-tertiary: #2D2A47;
    --text-primary: #E5E7EB;
    --text-secondary: #9CA3AF;
    --accent-color: #A78BFA;
    --accent-color-hover: #8B5CF6;
    --accent-text-color: #111827;
    --border-color: rgba(255, 255, 255, 0.1);
    --logo-color: white;
    --header-secondary: #D1D5DB;
    --user-avatar-bg: rgba(255, 255, 255, 0.1);
    --mic-color: #9CA3AF;
    --mic-hover-color: #E5E7EB;
    --mic-recording-color: #F87171;
    --code-bg-color: #11101B;
}

body.light-mode {
    --bg-primary: #F9FAFB;
    --bg-secondary: #FFFFFF;
    --bg-tertiary: #F3F4F6;
    --text-primary: #1F2937;
    --text-secondary: #4B5563;
    --accent-color: #8B5CF6;
    --accent-color-hover: #7C3AED;
    --accent-text-color: #FFFFFF;
    --border-color: rgba(0, 0, 0, 0.1);
    --logo-color: #1F2937;
    --header-secondary: #4B5563;
    --user-avatar-bg: rgba(0, 0, 0, 0.05);
    --mic-color: #6B7280;
    --mic-hover-color: #1F2937;
    --mic-recording-color: #EF4444;
    --code-bg-color: #E5E7EB;
}

/* --- Base and Font Setup --- */
body {
    font-family: 'Inter', sans-serif;
    margin: 0;
    padding: 0;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* --- Main App Container --- */
#app-container {
    position: relative;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    display: flex;
}

/* --- Animated Gradient Background --- */
.gradient-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, #1D1C2D, #3F3C5F, #1E1B3A, #4A3A70);
    background-size: 400% 400%;
    animation: gradientAnimation 15s ease infinite;
    z-index: 1;
    transition: opacity 0.5s ease;
}

body.light-mode .gradient-bg {
    opacity: 0;
}

/* --- History Panel --- */
.history-panel {
    position: fixed;
    top: 0;
    left: 0;
    width: 300px;
    height: 100%;
    background-color: var(--bg-primary);
    border-right: 1px solid var(--border-color);
    transform: translateX(-100%);
    transition: transform 0.3s ease-in-out;
    z-index: 10;
    display: flex;
    flex-direction: column;
}
.history-panel.open {
    transform: translateX(0);
}
.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}
.history-header h2 {
    margin: 0;
    font-size: 1.125rem;
}
.history-list {
    flex-grow: 1;
    overflow-y: auto;
    padding: 1rem;
}
.history-item {
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    margin-bottom: 0.5rem;
    cursor: pointer;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: background-color 0.2s ease;
}
.history-item:hover {
    background-color: var(--bg-tertiary);
}
.history-item.active {
    background-color: var(--accent-color);
    color: var(--accent-text-color);
}
.clear-all-button {
    margin: 1rem;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    background-color: transparent;
    color: var(--text-secondary);
    border-radius: 0.5rem;
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s;
}
.clear-all-button:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}


/* --- Chat UI Container --- */
.chat-ui-container {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-secondary);
    z-index: 2;
    transition: background-color 0.3s ease, margin-left 0.3s ease-in-out;
}

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

.logo-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.text-header-secondary {
    color: var(--header-secondary);
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.header-button {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.25rem;
    transition: color 0.2s ease;
}

.header-button:hover {
    color: var(--text-primary);
}

/* --- Chat Messages Area --- */
.chat-messages {
    flex-grow: 1;
    overflow-y: auto;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.message-group {
    display: flex;
    gap: 0.75rem;
    max-width: 80%;
}

.message-group.bot { align-self: flex-start; }
.message-group.user { align-self: flex-end; flex-direction: row-reverse; }

.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.message-group.bot .avatar {
    background-color: rgba(167, 139, 250, 0.2);
    color: var(--accent-color);
}

.message-group.user .avatar {
    background-color: var(--user-avatar-bg);
}

.logo-icon { width: 24px; height: 24px; }

.message-bubble {
    padding: 0.75rem 1rem;
    border-radius: 1rem;
    line-height: 1.5;
    font-size: 0.9rem;
    transition: background-color 0.3s ease, color 0.3s ease;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.message-group.bot .message-bubble {
    background-color: var(--bg-tertiary);
    border-top-left-radius: 0.25rem;
}

.message-group.user .message-bubble {
    background-color: var(--accent-color);
    color: var(--accent-text-color);
    border-top-right-radius: 0.25rem;
}

/* --- Code Block Styling --- */
.message-bubble pre {
    background-color: var(--code-bg-color);
    padding: 1rem;
    border-radius: 0.5rem;
    overflow-x: auto;
    font-size: 0.85rem;
    margin: 0.5rem 0;
}

.message-bubble code {
    font-family: 'Courier New', Courier, monospace;
}


/* --- Custom Scrollbar --- */
.chat-messages::-webkit-scrollbar { width: 8px; }
.chat-messages::-webkit-scrollbar-track { background: transparent; }
.chat-messages::-webkit-scrollbar-thumb { background-color: rgba(128, 128, 128, 0.3); border-radius: 4px; }
.chat-messages::-webkit-scrollbar-thumb:hover { background-color: rgba(128, 128, 128, 0.4); }

/* --- Input Area --- */
.chat-input-area {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
    flex-shrink: 0;
}

.input-wrapper {
    display: flex;
    align-items: center;
    background-color: var(--bg-tertiary);
    border-radius: 9999px;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    transition: background-color 0.3s ease;
}

.chat-input {
    flex-grow: 1;
    background: transparent;
    border: none;
    outline: none;
    padding: 0.5rem 1rem;
    color: var(--text-primary);
    font-size: 0.9rem;
}

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

.send-button {
    background-color: var(--accent-color);
    color: var(--accent-text-color);
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background-color 0.2s ease;
    flex-shrink: 0;
}

.send-button:hover { background-color: var(--accent-color-hover); }

/* --- Microphone Button --- */
.mic-button {
    background: transparent;
    border: none;
    color: var(--mic-color);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: color 0.2s ease, transform 0.2s ease;
    flex-shrink: 0;
}

.mic-button:hover {
    color: var(--mic-hover-color);
}

.mic-button.is-recording {
    color: var(--mic-recording-color);
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}


/* --- Theme Switcher --- */
.theme-switcher { position: relative; display: inline-block; width: 50px; height: 28px; }
.theme-toggle-checkbox { opacity: 0; width: 0; height: 0; }
.theme-toggle-label { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background-color: #4A5568; transition: .4s; border-radius: 34px; }
.theme-toggle-label:before { position: absolute; content: ""; height: 20px; width: 20px; left: 4px; bottom: 4px; background-color: white; transition: .4s; border-radius: 50%; }
.theme-toggle-checkbox:checked + .theme-toggle-label { background-color: var(--accent-color); }
.theme-toggle-checkbox:checked + .theme-toggle-label:before { transform: translateX(22px); }

/* --- Mobile Optimization --- */
@media (max-width: 768px) {
    .history-panel {
        width: 85%;
    }
    .chat-header, .chat-input-area { padding: 0.75rem 1rem; }
    .header-controls { gap: 0.5rem; }
    .chat-messages { padding: 1rem; gap: 1rem; }
    .message-group { max-width: 90%; }
    .avatar { width: 32px; height: 32px; }
    .logo-icon { width: 20px; height: 20px; }
    .message-bubble { font-size: 0.85rem; }
}