:root {
    --sidebar-width: 280px;
    --bg-main: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --input-bg: #010409;
    --text-primary: #c9d1d9;
    --text-secondary: #8b949e;
    --border-color: #30363d;
    --accent-color: #1f6feb;
    --accent-gradient: linear-gradient(90deg, #1f6feb, #2d82fc);
}

[data-bs-theme="light"] {
    --bg-main: #ffffff;
    --bg-secondary: #f6f8fa;
    --bg-tertiary: #e1e4e8;
    --input-bg: #ffffff;
    --text-primary: #1f2328;
    --text-secondary: #656d76;
    --border-color: #d0d7de;
    --accent-color: #0969da;
    --accent-gradient: linear-gradient(90deg, #0969da, #2c85f0);
}

body, html {
    height: 100%;
    overflow: hidden;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-primary);
}

/* --- Layout --- */
.app-container { display: flex; height: 100vh; width: 100vw; position: relative; transition: padding-left 0.3s ease-in-out, padding-right 0.3s ease-in-out; }
.sidebar { width: var(--sidebar-width); flex-shrink: 0; background-color: var(--bg-main); border-right: 1px solid var(--border-color); display: flex; flex-direction: column; transition: width 0.3s ease-in-out, margin-left 0.3s ease-in-out, margin-right 0.3s ease-in-out, transform 0.3s ease-in-out; }
.app-container[data-left-sidebar-collapsed="true"] #sidebar-left { width: 0; overflow: hidden; }
.app-container[data-right-sidebar-collapsed="true"] #sidebar-right { width: 0; overflow: hidden; }
#sidebar-right { border-right: none; border-left: 1px solid var(--border-color); }
.main-chat { flex: 1; display: flex; flex-direction: column; height: 100%; min-width: 0; }
.sidebar-header { height: 60px; display: flex; align-items: center; justify-content: space-between; padding: 0 1rem; border-bottom: 1px solid var(--border-color); flex-shrink: 0; }
.sidebar-content { flex: 1; overflow-y: auto; }

/* --- Responsive & Mobile --- */
@media (max-width: 991.98px) {
    .sidebar { position: fixed; height: 100%; top: 0; z-index: 1050; box-shadow: 0 0 20px rgba(0,0,0,0.3); }
    #sidebar-left { left: 0; transform: translateX(-100%); }
    #sidebar-left.active { transform: translateX(0); }
    #sidebar-right { right: 0; transform: translateX(100%); }
    #sidebar-right.active { transform: translateX(0); }
    .app-container[data-left-sidebar-collapsed="true"] #sidebar-left,
    .app-container[data-right-sidebar-collapsed="true"] #sidebar-right { width: var(--sidebar-width); }
}
.mobile-backdrop { position: fixed; top: 0; left: 0; right: 0; bottom: 0; background-color: rgba(0,0,0,0.5); z-index: 1040; opacity: 0; visibility: hidden; transition: opacity 0.3s ease, visibility 0.3s ease; }
.mobile-backdrop.active { opacity: 1; visibility: visible; }

/* --- Chat Area --- */
.chat-header { height: 60px; display: flex; align-items: center; padding: 0 1rem; border-bottom: 1px solid var(--border-color); background-color: var(--bg-main); flex-shrink: 0; }
.chat-history { flex: 1; overflow-y: auto; padding: 1rem; scroll-behavior: smooth; }
.chat-input-area { padding: 1rem; background-color: var(--bg-main); border-top: 1px solid var(--border-color); }
#user-input { background-color: var(--input-bg); border-color: var(--border-color); color: var(--text-primary); }
#user-input:focus { box-shadow: none; border-color: var(--accent-color); }
#send-btn-icon { transition: transform 0.3s ease-in-out, color 0.2s ease; }

/* --- Messages & Power Features --- */
.message { display: flex; flex-direction: column; margin-bottom: 1.5rem; animation: fadeIn 0.3s ease-out; position: relative; }
.message.user-message { align-items: flex-end; }
.message.bot-message { align-items: flex-start; }
.message:hover .message-actions { opacity: 1; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
.message-body { display: flex; width: 100%; }
.message.user-message .message-body { justify-content: flex-end; }
.message-content { max-width: 85%; padding: 0.75rem 1rem; border-radius: 1rem; position: relative; }
.user-message .message-content { background-color: var(--accent-color); background-image: var(--accent-gradient); color: white; border-bottom-right-radius: 0.25rem; }
.bot-message .message-content { background-color: var(--bg-secondary); color: var(--text-primary); border-bottom-left-radius: 0.25rem; }
.bot-message .blinking-cursor { display: inline-block; width: 8px; height: 1.2em; background-color: var(--text-primary); animation: blink 1s step-end infinite; vertical-align: text-bottom; }
@keyframes blink { 50% { opacity: 0; } }
.message-actions { position: absolute; top: -12px; z-index: 5; opacity: 0; transition: opacity 0.2s ease; }
.user-message .message-actions { right: 8px; }
.bot-message .message-actions { left: 8px; }
.message-actions .dropdown-menu { font-size: 0.9rem; }
.message-editor-panel { width: 100%; padding: 1rem; margin-bottom: 1rem; border: 1px dashed var(--border-color); border-radius: 0.5rem; background-color: var(--bg-tertiary); animation: fadeIn 0.2s ease-out; }

/* --- Markdown & Code Styling --- */
.bot-message pre { background-color: var(--input-bg); border: 1px solid var(--border-color); padding: 0.8rem; border-radius: 0.5rem; position: relative; margin-top: 0.5rem; }
.code-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.5rem; border-bottom: 1px solid var(--border-color); padding-bottom: 0.25rem; font-size: 0.8rem; color: var(--text-secondary); }
.copy-btn { background: transparent; border: 1px solid var(--border-color); color: var(--text-secondary); font-size: 0.75rem; border-radius: 4px; padding: 2px 6px; cursor: pointer; }
.copy-btn:hover { background: var(--bg-tertiary); color: var(--text-primary); }

/* --- Components --- */
.btn-icon { background: none; border: none; border-radius: 50%; width: 40px; height: 40px; display: flex; align-items: center; justify-content: center; color: var(--text-secondary); }
.btn-icon:hover { background-color: var(--bg-tertiary); color: var(--text-primary); }
.btn-primary { background-image: var(--accent-gradient); border: none; }
.conversation-item { padding: 0.75rem 1rem; cursor: pointer; color: var(--text-primary); text-decoration: none; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; border-radius: 0.5rem; margin: 0.25rem 0.5rem; }
.conversation-item:hover { background-color: var(--bg-tertiary); }
.conversation-item.active { background-color: var(--bg-secondary); font-weight: bold; }