:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --bg-hover: #30363d;
    --border: #30363d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #484f58;
    --accent: #58a6ff;
    --accent-hover: #79c0ff;
    --accent-bg: rgba(88, 166, 255, 0.1);
    --success: #3fb950;
    --warning: #d29922;
    --danger: #f85149;
    --danger-hover: #ff6b63;
    --user-msg: #1f6feb;
    --assistant-msg: #21262d;
    --shadow: 0 1px 3px rgba(0,0,0,0.3);
    --radius: 8px;
    --radius-sm: 4px;
    --sidebar-width: 360px;
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans", Ubuntu, sans-serif;
    --font-mono: "SF Mono", "Fira Code", "Cascadia Code", monospace;
}

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

html, body {
    height: 100%;
    font-family: var(--font);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow: hidden;
}

#app {
    display: flex;
    height: 100vh;
}

/* Sidebar */
#sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease, width 0.3s ease;
    overflow: hidden;
}

#sidebar.closed {
    transform: translateX(-100%);
    width: 0;
    min-width: 0;
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px;
    border-bottom: 1px solid var(--border);
}

.sidebar-header h1 {
    font-size: 16px;
    font-weight: 600;
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: 12px;
}

.sidebar-section {
    margin-bottom: 20px;
}

.sidebar-section h3 {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.sidebar-footer {
    padding: 12px 16px;
    border-top: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

/* Main */
#main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

#chatHeader {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    border-bottom: 1px solid var(--border);
    background: var(--bg-secondary);
}

.chat-info {
    flex: 1;
    min-width: 0;
}

.chat-info h2 {
    font-size: 15px;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

#chatMeta {
    font-size: 12px;
    color: var(--text-secondary);
}

/* Messages */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.welcome-message {
    text-align: center;
    margin: auto;
    max-width: 480px;
    padding: 40px 20px;
}

.welcome-icon {
    font-size: 64px;
    margin-bottom: 16px;
}

.welcome-message h2 {
    font-size: 24px;
    margin-bottom: 8px;
}

.welcome-message p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.warning-banner {
    background: rgba(210, 153, 34, 0.1);
    border: 1px solid var(--warning);
    padding: 12px 16px;
    border-radius: var(--radius);
    font-size: 13px;
}

.message {
    display: flex;
    gap: 12px;
    max-width: 800px;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.message-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    flex-shrink: 0;
}

.message.user .message-avatar {
    background: var(--user-msg);
}

.message.assistant .message-avatar {
    background: var(--accent-bg);
    border: 1px solid var(--accent);
}

.message-content {
    flex: 1;
    min-width: 0;
}

.message-content p {
    margin-bottom: 8px;
}

.message-content p:last-child {
    margin-bottom: 0;
}

.message-content pre {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 12px;
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 13px;
    margin: 8px 0;
}

.message-content code {
    font-family: var(--font-mono);
    font-size: 13px;
    background: var(--bg-tertiary);
    padding: 2px 4px;
    border-radius: 3px;
}

.message-content pre code {
    background: none;
    padding: 0;
}

.message-sources {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin-top: 8px;
}

.source-tag {
    font-size: 11px;
    padding: 2px 6px;
    background: var(--accent-bg);
    border: 1px solid var(--accent);
    border-radius: var(--radius-sm);
    color: var(--accent);
    text-decoration: none;
    cursor: pointer;
}

.source-tag:hover {
    background: var(--accent);
    color: var(--bg-primary);
}

.message-footer {
    display: flex;
    gap: 8px;
    margin-top: 4px;
}

.message-footer button {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 12px;
    padding: 2px 6px;
    border-radius: var(--radius-sm);
}

.message-footer button:hover {
    background: var(--bg-hover);
    color: var(--text-secondary);
}

/* Input Area */
.input-area {
    padding: 16px 20px;
    border-top: 1px solid var(--border);
    background: var(--bg-secondary);
}

.context-preview {
    margin-bottom: 8px;
    padding: 8px 12px;
    background: var(--accent-bg);
    border: 1px solid var(--accent);
    border-radius: var(--radius-sm);
    font-size: 12px;
    color: var(--accent);
}

.input-row {
    display: flex;
    gap: 8px;
    align-items: flex-end;
}

#messageInput {
    flex: 1;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 10px 14px;
    font-family: var(--font);
    font-size: 14px;
    color: var(--text-primary);
    resize: none;
    min-height: 42px;
    max-height: 200px;
    outline: none;
    transition: border-color 0.2s;
}

#messageInput:focus {
    border-color: var(--accent);
}

#messageInput:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.send-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 16px;
    height: 42px;
}

.send-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.input-footer {
    display: flex;
    justify-content: flex-end;
    margin-top: 4px;
    font-size: 11px;
    color: var(--text-muted);
}

/* Buttons */
.btn {
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    font-family: var(--font);
    font-size: 13px;
    font-weight: 500;
    transition: background 0.2s, transform 0.1s;
}

.btn:active {
    transform: scale(0.97);
}

.btn.primary {
    background: var(--accent);
    color: #fff;
}

.btn.primary:hover {
    background: var(--accent-hover);
}

.btn.success {
    background: var(--success);
    color: #fff;
}

.btn.success:hover {
    background: #4ade80;
}

.btn.small {
    font-size: 11px;
    padding: 4px 8px;
}

.icon-btn {
    background: none;
    border: 1px solid transparent;
    cursor: pointer;
    font-size: 16px;
    padding: 6px 8px;
    border-radius: var(--radius);
    color: var(--text-secondary);
    transition: background 0.2s, color 0.2s;
}

.icon-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.icon-btn.danger:hover {
    background: rgba(248, 81, 73, 0.1);
    color: var(--danger);
}

/* Conversation List */
.conversation-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.conv-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 10px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background 0.2s;
    font-size: 13px;
    color: var(--text-secondary);
}

.conv-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.conv-item.active {
    background: var(--accent-bg);
    color: var(--accent);
}

.conv-item .conv-title {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex: 1;
}

.conv-item .conv-delete {
    opacity: 0;
    font-size: 12px;
    padding: 2px 4px;
}

.conv-item:hover .conv-delete {
    opacity: 1;
}

/* Graph Stats */
.graph-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4px;
}

.stat-item {
    background: var(--bg-tertiary);
    padding: 8px;
    border-radius: var(--radius-sm);
    text-align: center;
}

.stat-value {
    font-size: 18px;
    font-weight: 600;
    color: var(--accent);
}

.stat-label {
    font-size: 10px;
    color: var(--text-secondary);
    text-transform: uppercase;
}

/* Search */
.search-box {
    display: flex;
    gap: 4px;
}

.search-box input {
    flex: 1;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 6px 10px;
    font-size: 13px;
    color: var(--text-primary);
    outline: none;
}

.search-box input:focus {
    border-color: var(--accent);
}

.kb-results {
    margin-top: 4px;
    max-height: 200px;
    overflow-y: auto;
}

.kb-result-item {
    padding: 6px 8px;
    font-size: 12px;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border);
    cursor: pointer;
}

.kb-result-item:hover {
    background: var(--bg-hover);
}

/* Toggle */
.toggle-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px 0;
}

.toggle-label input[type="checkbox"] {
    accent-color: var(--accent);
}

/* Status */
.status-indicator {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: var(--text-secondary);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--success);
}

.status-dot.degraded {
    background: var(--warning);
}

.status-dot.error {
    background: var(--danger);
}

/* Loading */
.loading {
    color: var(--text-muted);
    font-size: 12px;
    text-align: center;
    padding: 8px;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--bg-hover);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Typing indicator */
.typing-indicator {
    display: flex;
    gap: 4px;
    padding: 8px 0;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background: var(--accent);
    border-radius: 50%;
    animation: typing 1.4s infinite ease-in-out;
}

.typing-indicator span:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-indicator span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typing {
    0%, 60%, 100% { opacity: 0.3; transform: scale(0.8); }
    30% { opacity: 1; transform: scale(1.2); }
}

/* Markdown table styles */
.message-content table {
    border-collapse: collapse;
    margin: 8px 0;
    font-size: 13px;
    width: 100%;
}

.message-content th,
.message-content td {
    border: 1px solid var(--border);
    padding: 6px 10px;
    text-align: left;
}

.message-content th {
    background: var(--bg-tertiary);
    font-weight: 600;
}

/* ===== Providers Panel ===== */
.providers-panel {
    display: none;
    flex-direction: column;
    padding: 12px;
    gap: 8px;
}

.providers-panel.open {
    display: flex;
}

.providers-panel h3 {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.provider-card {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 10px;
    transition: border-color 0.2s;
}

.provider-card.disabled {
    opacity: 0.5;
}

.provider-card.active-provider {
    border-color: var(--accent);
}

.provider-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 6px;
}

.provider-name {
    font-size: 13px;
    font-weight: 600;
    flex: 1;
}

.provider-priority {
    font-size: 11px;
    color: var(--text-muted);
    background: var(--bg-hover);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
}

.provider-fields {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-top: 6px;
}

.provider-field {
    display: flex;
    align-items: center;
    gap: 6px;
}

.provider-field label {
    font-size: 11px;
    color: var(--text-secondary);
    min-width: 60px;
    flex-shrink: 0;
}

.provider-field input {
    flex: 1;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 4px 8px;
    font-size: 12px;
    color: var(--text-primary);
    outline: none;
    font-family: var(--font-mono);
}

.provider-field input:focus {
    border-color: var(--accent);
}

.provider-actions {
    display: flex;
    gap: 4px;
    margin-top: 6px;
    justify-content: flex-end;
}

.provider-test-result {
    font-size: 11px;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    margin-top: 4px;
}

.provider-test-result.success {
    background: rgba(63, 185, 80, 0.1);
    color: var(--success);
    border: 1px solid var(--success);
}

.provider-test-result.error {
    background: rgba(248, 81, 73, 0.1);
    color: var(--danger);
    border: 1px solid var(--danger);
}

.provider-test-result.pending {
    background: rgba(210, 153, 34, 0.1);
    color: var(--warning);
    border: 1px solid var(--warning);
}

.priority-controls {
    display: flex;
    gap: 2px;
}

.priority-controls button {
    background: var(--bg-hover);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 11px;
    padding: 2px 5px;
}

.priority-controls button:hover {
    background: var(--accent);
    color: #fff;
}

.save-providers-btn {
    margin-top: 8px;
    width: 100%;
}

/* Responsive */
@media (max-width: 768px) {
    #sidebar {
        position: fixed;
        z-index: 100;
        height: 100vh;
    }
}