/* CSS Variables for Theme */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --border-color: #dee2e6;
    --accent-color: #0d6efd;
    --accent-hover: #0b5ed7;
    --success-color: #198754;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s ease;
}

[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #3a3a3a;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --border-color: #404040;
    --accent-color: #4a9eff;
    --accent-hover: #3d8de6;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.4);
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
.header {
    background-color: var(--bg-primary);
    padding: 24px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.header-content {
    display: flex;
    flex-direction: column;
}

.logo {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    font-size: 2.5rem;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-top: 4px;
}

.header-actions {
    display: flex;
    gap: 12px;
}

.icon-btn {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px 16px;
    cursor: pointer;
    font-size: 1.5rem;
    transition: var(--transition);
}

.icon-btn:hover {
    background-color: var(--bg-tertiary);
    transform: scale(1.05);
}

/* Sections */
.section {
    background-color: var(--bg-primary);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 24px;
    box-shadow: var(--shadow);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
}

/* Upload Area */
.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 48px 24px;
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
}

.upload-area:hover {
    border-color: var(--accent-color);
    background-color: var(--bg-secondary);
}

.upload-area.drag-over {
    border-color: var(--accent-color);
    background-color: var(--bg-secondary);
}

.upload-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.upload-icon {
    font-size: 3rem;
}

.upload-text {
    font-size: 1.1rem;
    color: var(--text-primary);
}

.upload-subtext {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.upload-info {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-top: 8px;
}

.upload-progress {
    margin-top: 16px;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background-color: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background-color: var(--accent-color);
    transition: width 0.3s ease;
}

.progress-text {
    text-align: center;
    margin-top: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Buttons */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

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

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

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

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

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

.btn-danger:hover {
    background-color: #c82333;
}

/* Query Section */
.query-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.query-input {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    resize: vertical;
    transition: var(--transition);
}

.query-input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(13, 110, 253, 0.1);
}

.query-controls {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.search-type-selector {
    display: flex;
    gap: 12px;
    padding: 8px;
    background-color: var(--bg-secondary);
    border-radius: 8px;
}

.search-type-selector label {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    padding: 6px 12px;
    border-radius: 6px;
    transition: var(--transition);
}

.search-type-selector label:hover {
    background-color: var(--bg-tertiary);
}

.search-type-selector input[type="radio"] {
    cursor: pointer;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    cursor: pointer;
    width: 18px;
    height: 18px;
}

/* Provider Selector */
.provider-selector {
    display: flex;
    align-items: center;
    gap: 8px;
}

.provider-selector label {
    font-weight: 500;
    color: var(--text-secondary);
}

.provider-select {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
}

.provider-select:hover {
    border-color: var(--accent-color);
}

.provider-select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px var(--accent-shadow);
}

.model-display {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-style: italic;
    white-space: nowrap;
}

/* Search Results */
.search-results {
    margin-top: 24px;
}

.llm-response {
    background-color: var(--bg-secondary);
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 24px;
    border-left: 4px solid var(--accent-color);
}

.llm-content {
    line-height: 1.8;
    color: var(--text-primary);
    max-height: 500px;
    overflow-y: auto;
}

.streaming-cursor {
    display: inline-block;
    width: 8px;
    height: 1em;
    background-color: var(--accent-color);
    animation: blink 1s infinite;
    margin-left: 2px;
}

@keyframes blink {
    0%, 49% {
        opacity: 1;
    }
    50%, 100% {
        opacity: 0;
    }
}

.result-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.results-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.result-item {
    background-color: var(--bg-secondary);
    padding: 16px;
    border-radius: 8px;
    border-left: 3px solid var(--accent-color);
    transition: var(--transition);
}

.result-item:hover {
    box-shadow: var(--shadow);
    transform: translateX(4px);
}

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

.result-filename {
    font-weight: 600;
    color: var(--accent-color);
}

.result-score {
    background-color: var(--bg-tertiary);
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.result-meta {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.result-content {
    color: var(--text-primary);
    line-height: 1.6;
}

/* Documents List */
.documents-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.document-item {
    background-color: var(--bg-secondary);
    padding: 16px;
    border-radius: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.document-item:hover {
    box-shadow: var(--shadow);
}

.document-info {
    flex: 1;
}

.document-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.document-meta {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.document-actions {
    display: flex;
    gap: 8px;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.stat-card {
    background-color: var(--bg-secondary);
    padding: 20px;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-color);
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background-color: var(--bg-primary);
    border-radius: 12px;
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-size: 1.5rem;
    color: var(--text-primary);
}

.close-btn {
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
}

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

.modal-body {
    padding: 24px;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

/* Form Elements */
.form-input {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    transition: var(--transition);
}

.form-input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(13, 110, 253, 0.1);
}

.slider {
    width: 100%;
    height: 8px;
    border-radius: 4px;
    background: var(--bg-tertiary);
    outline: none;
    -webkit-appearance: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent-color);
    cursor: pointer;
}

.slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent-color);
    cursor: pointer;
    border: none;
}

.help-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.toast {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    padding: 16px 20px;
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    min-width: 300px;
    display: flex;
    align-items: center;
    gap: 12px;
    animation: slideIn 0.3s ease;
    border-left: 4px solid var(--accent-color);
}

.toast.success {
    border-left-color: var(--success-color);
}

.toast.error {
    border-left-color: var(--danger-color);
}

.toast.warning {
    border-left-color: var(--warning-color);
}

@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.empty-state {
    text-align: center;
    color: var(--text-secondary);
    padding: 48px 24px;
    font-size: 1.1rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 12px;
    }

    .header {
        flex-direction: column;
        gap: 16px;
    }

    .logo {
        font-size: 1.5rem;
    }

    .query-controls {
        flex-direction: column;
        align-items: stretch;
    }

    .search-type-selector {
        flex-direction: column;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .modal-content {
        width: 95%;
    }
}