/* CSS Variables */
:root {
    --bg-primary: #1a1b26;
    --bg-secondary: #24283b;
    --bg-tertiary: #2f3549;
    --text-primary: #c0caf5;
    --text-secondary: #a9b1d6;
    --text-muted: #565f89;
    --accent-primary: #7aa2f7;
    --accent-secondary: #bb9af7;
    --accent-success: #9ece6a;
    --accent-warning: #e0af68;
    --accent-error: #f7768e;
    --border-color: #3b4261;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --radius: 8px;
    --radius-lg: 12px;
}

/* Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
}

/* App Layout */
.app {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 240px;
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.logo {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.logo h1 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--accent-primary);
}

.nav-menu {
    list-style: none;
    padding: 1rem 0;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.875rem 1.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
    color: var(--text-secondary);
}

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

.nav-item.active {
    background-color: var(--bg-tertiary);
    color: var(--accent-primary);
    border-left: 3px solid var(--accent-primary);
}

.nav-icon {
    font-size: 1.25rem;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 2rem;
    overflow-y: auto;
}

/* Sections */
.section {
    display: none;
    animation: fadeIn 0.3s ease;
}

.section.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.section-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    border: none;
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.btn-primary:hover {
    background-color: #89b4fa;
}

.btn-primary:disabled {
    background-color: var(--text-muted);
    cursor: not-allowed;
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--border-color);
}

.btn-danger {
    background-color: var(--accent-error);
    color: white;
}

.btn-danger:hover {
    background-color: #ff8a9a;
}

.danger-zone {
    border-color: var(--accent-error) !important;
}

.danger-zone h3 {
    color: var(--accent-error);
}

.hidden {
    display: none !important;
}

/* Chat Section */
.chat-container {
    display: flex;
    flex-direction: column;
    height: calc(100vh - 200px);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.message {
    max-width: 80%;
    padding: 1rem;
    border-radius: var(--radius);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateX(-10px); }
    to { opacity: 1; transform: translateX(0); }
}

.message.user {
    align-self: flex-end;
    background-color: var(--accent-primary);
    color: var(--bg-primary);
}

.message.assistant {
    align-self: flex-start;
    background-color: var(--bg-tertiary);
}

.message.system {
    align-self: center;
    background-color: transparent;
    color: var(--text-muted);
    font-style: italic;
}

.message.error {
    align-self: center;
    background-color: rgba(247, 118, 142, 0.2);
    color: var(--accent-error);
    border: 1px solid var(--accent-error);
}

.message-content {
    word-wrap: break-word;
}

.message-content p {
    margin-bottom: 0.5rem;
}

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

.message-content code {
    background-color: var(--bg-primary);
    padding: 0.125rem 0.375rem;
    border-radius: 4px;
    font-family: 'Fira Code', 'Consolas', monospace;
    font-size: 0.875em;
}

.message-content pre {
    background-color: var(--bg-primary);
    padding: 1rem;
    border-radius: var(--radius);
    overflow-x: auto;
    margin: 0.5rem 0;
}

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

.message-sources {
    margin-top: 1rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.8rem;
    color: var(--text-muted);
}

.message-sources summary {
    cursor: pointer;
    color: var(--accent-secondary);
}

.message-sources ul {
    margin-top: 0.5rem;
    padding-left: 1.5rem;
}

.message-sources li {
    margin-bottom: 0.25rem;
}

.chat-input-container {
    display: flex;
    gap: 0.75rem;
    padding: 1rem;
    background-color: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
}

#chat-input {
    flex: 1;
    padding: 0.75rem 1rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 0.9375rem;
    resize: none;
    font-family: inherit;
}

#chat-input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

#chat-input::placeholder {
    color: var(--text-muted);
}

/* Status Section */
.status-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
}

.status-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.status-icon {
    font-size: 2rem;
}

.status-info {
    flex: 1;
}

.status-info h3 {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.status-info p {
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.status-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--text-muted);
}

.status-indicator.ok {
    background-color: var(--accent-success);
    box-shadow: 0 0 8px var(--accent-success);
}

.status-indicator.error {
    background-color: var(--accent-error);
    box-shadow: 0 0 8px var(--accent-error);
}

/* Admin Section */
.admin-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.admin-card {
    padding: 1.5rem;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.admin-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.admin-card p {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

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

.admin-controls input[type="number"] {
    width: 100px;
    padding: 0.625rem;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 0.875rem;
}

.admin-controls input[type="number"]:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.admin-log {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    padding: 1rem;
}

.admin-log h3 {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
}

.log-content {
    max-height: 200px;
    overflow-y: auto;
    font-family: 'Fira Code', 'Consolas', monospace;
    font-size: 0.8125rem;
    background-color: var(--bg-primary);
    padding: 0.75rem;
    border-radius: var(--radius);
}

.log-entry {
    padding: 0.25rem 0;
    border-bottom: 1px solid var(--border-color);
}

.log-entry:last-child {
    border-bottom: none;
}

.log-entry.info {
    color: var(--text-muted);
}

.log-entry.success {
    color: var(--accent-success);
}

.log-entry.error {
    color: var(--accent-error);
}

.log-entry.warning {
    color: var(--accent-warning);
}

/* Metrics Section */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.metric-card {
    text-align: center;
    padding: 2rem;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.metric-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-primary);
    margin-bottom: 0.5rem;
}

.metric-label {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* Loading animation */
.loading {
    position: relative;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

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

/* Progress Bar */
.progress-container {
    margin-top: 1rem;
    padding: 1rem;
    background-color: var(--bg-tertiary);
    border-radius: var(--radius);
}

.progress-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.progress-bar {
    height: 8px;
    background-color: var(--bg-primary);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 4px;
    transition: width 0.3s ease;
    width: 0%;
}

.progress-current {
    margin-top: 0.5rem;
    font-size: 0.8125rem;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

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

.search-input {
    padding: 0.5rem 1rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 0.875rem;
    width: 200px;
}

.search-input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.documents-container {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.documents-table {
    width: 100%;
    border-collapse: collapse;
}

.documents-table th,
.documents-table td {
    padding: 0.875rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.documents-table th {
    background-color: var(--bg-tertiary);
    font-weight: 600;
    font-size: 0.8125rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}

.documents-table tbody tr:hover {
    background-color: var(--bg-tertiary);
}

.documents-table td:last-child {
    text-align: right;
}

.loading-cell {
    text-align: center !important;
    color: var(--text-muted);
    padding: 2rem !important;
}

.btn-icon {
    padding: 0.375rem 0.625rem;
    font-size: 0.875rem;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    margin-left: 0.5rem;
}

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

.btn-icon.danger:hover {
    background-color: rgba(247, 118, 142, 0.2);
    border-color: var(--accent-error);
    color: var(--accent-error);
}

.pagination {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem;
    border-top: 1px solid var(--border-color);
}

.pagination button {
    padding: 0.5rem 0.75rem;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.pagination button:hover:not(:disabled) {
    background-color: var(--accent-primary);
    color: var(--bg-primary);
}

.pagination button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pagination button.active {
    background-color: var(--accent-primary);
    color: var(--bg-primary);
}

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 2rem;
}

.modal-content {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    max-width: 800px;
    width: 100%;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border-color);
}

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

.modal-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.25rem;
    line-height: 1;
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: 1.5rem;
    overflow-y: auto;
    flex: 1;
}

.chunk-item {
    padding: 1rem;
    background-color: var(--bg-tertiary);
    border-radius: var(--radius);
    margin-bottom: 1rem;
    font-size: 0.875rem;
    line-height: 1.6;
}

.chunk-item:last-child {
    margin-bottom: 0;
}

.chunk-header {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

/* Metrics Section Extended */
.metrics-section {
    margin-top: 1.5rem;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    padding: 1rem;
}

.metrics-section h3 {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
}

.recent-queries,
.popular-queries {
    max-height: 300px;
    overflow-y: auto;
}

.query-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.625rem 0.75rem;
    background-color: var(--bg-tertiary);
    border-radius: var(--radius);
    margin-bottom: 0.5rem;
    font-size: 0.8125rem;
}

.query-item:last-child {
    margin-bottom: 0;
}

.query-text {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-right: 1rem;
}

.query-meta {
    display: flex;
    gap: 0.75rem;
    font-size: 0.75rem;
    color: var(--text-muted);
    flex-shrink: 0;
}

.query-meta .success {
    color: var(--accent-success);
}

.query-meta .error {
    color: var(--accent-error);
}

.text-muted {
    color: var(--text-muted);
    font-style: italic;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        width: 60px;
    }

    .logo h1, .nav-item span:not(.nav-icon) {
        display: none;
    }

    .nav-item {
        justify-content: center;
        padding: 1rem;
    }

    .main-content {
        padding: 1rem;
    }

    .chat-container {
        height: calc(100vh - 150px);
    }

    .message {
        max-width: 95%;
    }
}