:root {
    --color-bg: #f4f6f9;
    --color-surface: #ffffff;
    --color-border: #e2e8f0;
    --color-text: #1a202c;
    --color-text-secondary: #64748b;
    --color-primary: #3b82f6;
    --color-primary-hover: #2563eb;
    --color-success: #10b981;
    --color-success-bg: #ecfdf5;
    --color-info: #3b82f6;
    --color-info-bg: #eff6ff;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-error-bg: #fef2f2;
    --radius: 8px;
    --radius-sm: 4px;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.06), 0 2px 4px rgba(0, 0, 0, 0.04);
    --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --transition: 150ms ease;
}

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

body {
    font-family: var(--font);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
}

/* Header */
.app-header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 12px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
}

.app-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
}

.auth-section {
    display: flex;
    align-items: center;
    gap: 12px;
}

.auth-panel {
    display: flex;
    align-items: center;
    gap: 8px;
}

.auth-input {
    width: 240px;
}

.auth-status {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-success);
    padding: 4px 10px;
    background: var(--color-success-bg);
    border-radius: var(--radius-sm);
}

/* Tab Navigation */
.tab-nav {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 0 24px;
    display: flex;
    gap: 0;
}

.tab-btn {
    background: none;
    border: none;
    padding: 12px 20px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: color var(--transition), border-color var(--transition);
}

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

.tab-btn.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

.sub-tab-nav {
    display: flex;
    gap: 0;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--color-border);
}

.sub-tab-btn {
    background: none;
    border: none;
    padding: 10px 16px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: color var(--transition), border-color var(--transition);
}

.sub-tab-btn:hover {
    color: var(--color-text);
}

.sub-tab-btn.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

/* Main Content */
.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px;
}

.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
}

.sub-tab-panel {
    display: none;
}

.sub-tab-panel.active {
    display: block;
}

/* Forms */
.eval-form {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--color-text);
}

.form-group .required {
    color: var(--color-error);
}

.form-group .hint {
    font-weight: 400;
    color: var(--color-text-secondary);
    font-size: 0.8rem;
}

.form-row {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.form-row .form-group {
    flex: 1;
    min-width: 160px;
}

textarea,
input[type="text"],
input[type="number"],
input[type="password"],
select {
    width: 100%;
    padding: 5px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-family: var(--font);
    font-size: 0.875rem;
    color: var(--color-text);
    background: var(--color-surface);
    transition: border-color var(--transition), box-shadow var(--transition);
}

textarea[name="user_input"] {
    height: 4em;
}

textarea:focus,
input:focus,
select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

textarea {
    resize: vertical;
    font-family: 'SF Mono', 'Fira Code', 'Fira Mono', Menlo, monospace;
    font-size: 0.8rem;
    line-height: 1.5;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    transition: background var(--transition), opacity var(--transition);
}

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

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

.btn-primary:hover:not(:disabled) {
    background: var(--color-primary-hover);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text);
}

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

.btn-sm {
    padding: 6px 12px;
    font-size: 0.8rem;
}

.example-buttons {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
}

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

.btn-example {
    padding: 5px 14px;
    font-size: 0.82rem;
    border-radius: var(--radius-sm);
    border: 1px solid;
    cursor: pointer;
    transition: background var(--transition), color var(--transition);
}

.btn-example-good {
    background: #f0faf4;
    border-color: #22c55e;
    color: #15803d;
}

.btn-example-good:hover {
    background: #dcfce7;
}

.btn-example-bad {
    background: #fff5f5;
    border-color: #ef4444;
    color: #b91c1c;
}

.btn-example-bad:hover {
    background: #fee2e2;
}

/* Drop Zone */
.drop-zone {
    border: 2px dashed var(--color-border);
    border-radius: var(--radius);
    text-align: center;
    cursor: pointer;
    transition: border-color var(--transition), background var(--transition);
    position: relative;
    margin-bottom: 16px;
}

.drop-zone:hover,
.drop-zone.drag-over {
    border-color: var(--color-primary);
    background: var(--color-info-bg);
}

.drop-zone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--color-text-secondary);
}

.drop-zone-content p {
    margin: 0;
    font-size: 0.9rem;
}

.drop-zone-hint {
    font-size: 0.8rem !important;
    color: var(--color-text-secondary);
}

.upload-icon {
    width: 40px;
    height: 40px;
    color: var(--color-text-secondary);
}

.file-input {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}

.file-info {
    background: var(--color-info-bg);
    border: 1px solid var(--color-info);
    border-radius: var(--radius-sm);
    padding: 10px 14px;
    font-size: 0.85rem;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.file-info .file-name {
    font-weight: 600;
}

.file-info .file-cases {
    color: var(--color-text-secondary);
}

.file-preview-controls {
    margin-bottom: 12px;
}

.file-preview {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-bg);
    padding: 12px;
    margin-bottom: 16px;
}

.file-preview-summary {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: 8px;
}

.file-preview-json {
    margin: 0;
    max-height: 300px;
    overflow: scroll;
    font-size: 0.75rem;
    line-height: 1.5;
    font-family: 'SF Mono', 'Fira Code', 'Fira Mono', Menlo, monospace;
}

/* Info Box */
.info-box {
    background: var(--color-info-bg);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: var(--radius);
    padding: 14px 18px;
    margin-bottom: 20px;
    font-size: 0.85rem;
    line-height: 1.6;
}

.info-box code {
    background: rgba(59, 130, 246, 0.1);
    padding: 2px 5px;
    border-radius: 3px;
    font-size: 0.8rem;
}

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

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

.results-header h3 {
    font-size: 1rem;
    font-weight: 600;
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 12px;
    margin-bottom: 20px;
}

.metric-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 16px;
    box-shadow: var(--shadow);
}

.metric-card .metric-name {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    margin-bottom: 6px;
}

.metric-card .metric-score {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-text);
}

.metric-card .metric-score.score-good {
    color: var(--color-success);
}

.metric-card .metric-score.score-warning {
    color: var(--color-warning);
}

.metric-card .metric-score.score-bad {
    color: var(--color-error);
}

.metric-card .metric-reason {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    margin-top: 6px;
    line-height: 1.4;
}

/* Progress Section */
.progress-section {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 20px;
    margin-top: 20px;
    box-shadow: var(--shadow);
}

.progress-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.progress-header .job-id {
    font-family: monospace;
    font-size: 1rem;
    color: var(--color-text);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 4px 10px;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.status-badge.pending {
    background: #fef3c7;
    color: #92400e;
}

.status-badge.in_progress {
    background: #dbeafe;
    color: #1e40af;
}

.status-badge.completed {
    background: var(--color-success-bg);
    color: #065f46;
}

.status-badge.failed {
    background: var(--color-error-bg);
    color: #991b1b;
}

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

.progress-bar {
    background: var(--color-primary);
    height: 100%;
    border-radius: 4px;
    transition: width 300ms ease;
}

.progress-text {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    margin-top: 6px;
}

.polling-timer {
    font-size: 0.8rem;
    color: var(--color-text);
    font-weight: 600;
    margin-top: 6px;
}

/* Case Results Table */
.case-results-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8rem;
    margin-top: 16px;
}

.case-results-table th,
.case-results-table td {
    padding: 8px 12px;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

.case-results-table th {
    font-weight: 600;
    color: var(--color-text-secondary);
    background: var(--color-bg);
}

.case-results-table tr:hover td {
    background: var(--color-bg);
}

/* Error Message */
.error-message {
    background: var(--color-error-bg);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    font-size: 0.85rem;
    color: #991b1b;
    margin-top: 16px;
}

/* Loading Spinner */
.spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.btn.loading .spinner {
    margin-right: 4px;
}

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

.batch-form {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
}

/* Download button */
.btn-download {
    background: var(--color-success);
    color: white;
}

.btn-download:hover:not(:disabled) {
    background: #059669;
}