/* =========================
   CSS Reset & Base Styles
   ========================= */

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

:root {
    /* Color Palette - Premium Dark Theme */
    --primary: #8b5cf6;
    --primary-light: #a78bfa;
    --primary-dark: #7c3aed;
    --secondary: #3b82f6;
    --accent: #06b6d4;

    --bg-dark: #0f172a;
    --bg-card: #1e293b;
    --bg-hover: #334155;

    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;

    --border: #334155;
    --error: #ef4444;
    --success: #10b981;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;

    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

/* =========================
   Container & Layout
   ========================= */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md);
}

/* =========================
   Header
   ========================= */

.header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl) var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, transparent 30%, rgba(255, 255, 255, 0.1) 50%, transparent 70%);
    animation: shimmer 3s infinite;
}

@keyframes shimmer {

    0%,
    100% {
        transform: translateX(-100%);
    }

    50% {
        transform: translateX(100%);
    }
}

.header-content {
    position: relative;
    z-index: 1;
}

.title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    font-weight: 400;
}

/* =========================
   Tabs Navigation
   ========================= */

.tabs {
    margin-top: var(--spacing-md);
    display: flex;
    gap: var(--spacing-sm);
    position: relative;
    z-index: 1;
}

.tab {
    flex: 1;
    padding: 0.75rem 1.5rem;
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.tab:hover {
    background: rgba(255, 255, 255, 0.15);
}

.tab.active {
    background: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.3);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

/* =========================
   Main Content
   ========================= */

.main-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* =========================
   Landing Page Agent Tiles
   ========================= */

.landing-section {
    padding: var(--spacing-xl) 0;
}

.agent-tiles {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

.agent-tile {
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.agent-tile::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    opacity: 0;
    transition: var(--transition);
}

.agent-tile:hover {
    border-color: var(--primary);
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.agent-tile:hover::before {
    opacity: 1;
}

.tile-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
    display: block;
}

.tile-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.tile-description {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.tile-btn {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    border: none;
    padding: 0.75rem 2rem;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.tile-btn:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

/* =========================
   Back Button
   ========================= */

.back-btn {
    position: absolute;
    top: var(--spacing-md);
    left: var(--spacing-md);
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    z-index: 10;
}

.back-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

.back-btn.hidden {
    display: none;
}

/* =========================
   Agent Sections
   ========================= */

.agent-section {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border);
}

.agent-section.hidden {
    display: none;
}

.section-header {
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--border);
}

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

/* =========================
   Dedup Tabs (within Deduplication Agent)
   ========================= */

.dedup-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.dedup-tab {
    flex: 1;
    padding: 0.75rem 1.5rem;
    background: var(--bg-dark);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.dedup-tab:hover {
    border-color: var(--primary);
    color: var(--text-primary);
}

.dedup-tab.active {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-color: transparent;
    color: white;
}

.dedup-tab-content {
    animation: fadeIn 0.3s ease-out;
}

.dedup-tab-content.hidden {
    display: none;
}

/* =========================
   Search Section
   ========================= */

.search-section {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border);
}

.input-group {
    margin-bottom: var(--spacing-md);
}

.label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.textarea {
    width: 100%;
    background: var(--bg-dark);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    resize: vertical;
    transition: var(--transition);
}

.textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.2);
}

.textarea::placeholder {
    color: var(--text-muted);
}

.search-controls {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-end;
}

.limit-control {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.label-small {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.limit-input {
    width: 100px;
    padding: 0.75rem;
    background: var(--bg-dark);
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
}

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

.search-btn {
    flex: 1;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    padding: 1rem 2rem;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.search-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.search-btn:active {
    transform: translateY(0);
}

.search-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* =========================
   Loading State
   ========================= */

.loading {
    text-align: center;
    padding: var(--spacing-xl);
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    margin: 0 auto var(--spacing-md);
    animation: spin 1s linear infinite;
}

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

.loading p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* =========================
   Error Message
   ========================= */

.error-message {
    background: rgba(239, 68, 68, 0.1);
    border: 2px solid var(--error);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.error-icon {
    font-size: 1.5rem;
}

.error-message p {
    color: #fca5a5;
    font-weight: 500;
}

/* =========================
   Results Section
   ========================= */

.results-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.stats-card {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.15) 0%, rgba(59, 130, 246, 0.15) 100%);
    border: 1px solid var(--primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
}

.stats-title {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.stat-item {
    background: var(--bg-card);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-light);
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.results-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.sort-filter {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.sort-filter label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.sort-select {
    padding: 0.5rem 1rem;
    background: var(--bg-dark);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
}

.sort-select:hover {
    border-color: var(--primary);
}

.sort-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.2);
}

#resultsCount {
    color: var(--primary-light);
}

/* =========================
   Test Cases Grid
   ========================= */

.test-cases-grid {
    display: grid;
    gap: var(--spacing-md);
}

.test-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    transition: var(--transition);
    cursor: pointer;
}

.test-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    background: var(--bg-hover);
}

.test-card-header {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.test-id {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    white-space: nowrap;
}

.test-title {
    flex: 1;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
}

.test-reason {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
    margin-top: var(--spacing-xs);
    padding-left: var(--spacing-sm);
    border-left: 3px solid var(--primary);
    margin-bottom: var(--spacing-sm);
}

.test-details {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border);
    display: none;
    /* Hidden by default */
}

.test-card.expanded .test-details {
    display: block;
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-5px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.detail-section {
    margin-bottom: var(--spacing-md);
}

.detail-label {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.detail-content {
    font-size: 0.95rem;
    color: var(--text-primary);
}

.steps-list {
    list-style-position: inside;
    padding-left: var(--spacing-xs);
}

.steps-list li {
    margin-bottom: 4px;
}

.expand-btn {
    width: 100%;
    background: transparent;
    border: 1px dashed var(--border);
    color: var(--text-secondary);
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.85rem;
    transition: var(--transition);
    margin-top: var(--spacing-sm);
}

.expand-btn:hover {
    border-color: var(--primary);
    color: var(--primary-light);
    background: rgba(139, 92, 246, 0.05);
}

/* =========================
   Deduplication Specific
   ========================= */

.info-box {
    background: rgba(6, 182, 212, 0.1);
    border: 1px solid var(--accent);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.info-icon {
    font-size: 1.25rem;
    flex-shrink: 0;
}

.info-box p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
}

.threshold-control {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.threshold-slider {
    width: 100%;
    height: 6px;
    background: var(--bg-dark);
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
}

.threshold-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.threshold-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: var(--shadow-md);
}

.threshold-slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.threshold-slider::-moz-range-thumb:hover {
    transform: scale(1.2);
    box-shadow: var(--shadow-md);
}

.threshold-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 4px;
}

/* Duplicate Groups Grid */

.duplicate-groups {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.duplicate-group {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

.group-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--border);
}

.group-header h3 {
    font-size: 1.3rem;
    color: var(--text-primary);
}

.recommendation-badge {
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    color: white;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.group-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.test-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.primary-test,
.duplicate-tests {
    background: var(--bg-dark);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
}

.primary-test {
    border-color: var(--success);
}

.test-info h4,
.duplicate-item h4 {
    font-size: 1rem;
    color: var(--text-primary);
    margin: var(--spacing-xs) 0;
}

.description {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-top: var(--spacing-xs);
}

.steps-count {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
}

.duplicate-item {
    padding: var(--spacing-sm);
    background: var(--bg-hover);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
    border: 1px solid var(--border);
}

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

.analysis-section {
    background: rgba(139, 92, 246, 0.1);
    border: 1px solid var(--primary);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.analysis-section h4 {
    color: var(--primary-light);
    margin-bottom: var(--spacing-sm);
    font-size: 1rem;
}

.analysis-section p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-xs);
}

.analysis-section p:last-child {
    margin-bottom: 0;
}

#groupsCount {
    color: var(--accent);
}

/* Responsive for duplicate groups */
@media (max-width: 768px) {
    .group-content {
        grid-template-columns: 1fr;
    }

    .tabs {
        flex-direction: column;
    }

    .pair-comparison {
        grid-template-columns: 1fr !important;
    }
}

/* =========================
   Semantic Duplicates - Pairwise Style
   ========================= */

.duplicate-group-semantic {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

.group-header-semantic {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--border);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.group-title-section {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.group-title-section h3 {
    font-size: 1.2rem;
    color: var(--text-primary);
    margin: 0;
    line-height: 1.4;
}

.member-count-badge {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: 0.35rem 0.85rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    white-space: nowrap;
}

.group-actions {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.group-members-summary {
    background: rgba(139, 92, 246, 0.08);
    border: 1px solid rgba(139, 92, 246, 0.2);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.members-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 600;
    display: block;
    margin-bottom: var(--spacing-xs);
}

.member-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.member-tag {
    padding: 0.3rem 0.7rem;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 600;
    transition: var(--transition);
}

.member-tag.primary-tag {
    background: var(--success);
    color: white;
    box-shadow: 0 2px 4px rgba(16, 185, 129, 0.3);
}

.member-tag.duplicate-tag {
    background: #f59e0b;
    color: white;
    box-shadow: 0 2px 4px rgba(245, 158, 11, 0.3);
}

.member-tag:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.group-header-semantic h3 {
    font-size: 1.3rem;
    color: var(--text-primary);
}

.duplicate-pair {
    background: var(--bg-dark);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    border: 1px solid var(--border);
}

.duplicate-pair:last-child {
    margin-bottom: 0;
}

.pair-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.similarity-score {
    font-size: 1rem;
    font-weight: 700;
    color: var(--primary-light);
}

.review-suggestion-btn {
    padding: 0.5rem 1rem;
    background: transparent;
    border: 1px solid var(--primary);
    color: var(--primary-light);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.85rem;
    transition: var(--transition);
}

.review-suggestion-btn:hover {
    background: rgba(139, 92, 246, 0.1);
}

.pair-comparison {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.test-case-column {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    border: 2px solid var(--border);
    min-height: 200px;
}

.primary-column {
    border-color: var(--success);
    border-width: 3px;
    background: rgba(16, 185, 129, 0.03);
}

.duplicate-column {
    border-color: #f59e0b;
    border-width: 3px;
    background: rgba(245, 158, 11, 0.03);
}

.column-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.primary-badge {
    background: var(--success);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
}

.duplicate-badge {
    background: #f59e0b;
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
}

.test-title {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

.test-field {
    margin-top: var(--spacing-sm);
}

.field-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--text-muted);
    font-weight: 700;
    margin-bottom: 4px;
}

.field-value {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.steps-preview {
    font-size: 0.85rem;
    color: var(--text-secondary);
    padding-left: 1.5rem;
    margin-top: 4px;
}

.steps-preview li {
    margin-bottom: 4px;
}

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

.ai-explanation {
    background: rgba(59, 130, 246, 0.15);
    border: 2px solid var(--secondary);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    display: flex;
    gap: var(--spacing-sm);
    align-items: flex-start;
    margin-top: var(--spacing-sm);
}

.explanation-icon {
    font-size: 1.8rem;
    flex-shrink: 0;
}

.explanation-text {
    font-size: 1rem;
    color: var(--text-primary);
    line-height: 1.7;
    font-weight: 500;
}

.explanation-text strong {
    color: var(--text-primary);
}

.recommendation-merge {
    background: #f59e0b;
}

.recommendation-keep_primary {
    background: var(--success);
}

.recommendation-review {
    background: var(--secondary);
}

/* =========================
   Exact Duplicates Specific
   ========================= */

.exact-info {
    background: rgba(236, 201, 75, 0.1);
    border-color: #ecc94b;
}

.exact-btn {
    background: linear-gradient(135deg, #ecc94b 0%, #d69e2e 100%);
}

.exact-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.exact-duplicate-groups {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.exact-group {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

.exact-group-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--border);
}

.exact-group-header h3 {
    font-size: 1.3rem;
    color: var(--text-primary);
}

.match-type-badge {
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    background: #ecc94b;
    color: #1a202c;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.match-info {
    background: rgba(236, 201, 75, 0.1);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.exact-test-list {
    background: var(--bg-dark);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
}

.exact-test-item {
    padding: var(--spacing-md);
    background: var(--bg-hover);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
    border: 1px solid var(--border);
}

.exact-test-item.primary {
    border-color: var(--success);
    background: rgba(16, 185, 129, 0.05);
}

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

.test-header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xs);
}

.keep-badge {
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    background: var(--success);
    color: white;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
}

.remove-badge {
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    background: #f59e0b;
    color: white;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
}

.exact-test-item h4 {
    font-size: 1rem;
    color: var(--text-primary);
    margin: var(--spacing-xs) 0;
}

.test-desc-preview {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
    font-style: italic;
}

.test-priority,
.test-created {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.details-toggle-btn {
    width: 100%;
    margin-top: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: transparent;
    border: 1px dashed var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    font-size: 0.85rem;
}

.details-toggle-btn:hover {
    border-color: #ecc94b;
    color: #ecc94b;
    background: rgba(236, 201, 75, 0.05);
}

.toggle-icon {
    font-size: 0.7rem;
    transition: transform 0.3s ease;
}

.exact-test-details {
    display: none;
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border);
    animation: fadeIn 0.3s ease-out;
}

.exact-test-item.expanded .exact-test-details {
    display: block;
}

.exact-test-item.expanded {
    cursor: default;
}

.exact-test-item:not(.expanded) {
    cursor: pointer;
}

.exact-test-item:not(.expanded):hover {
    background: var(--bg-card);
}

.detail-section {
    margin-bottom: var(--spacing-md);
}

.detail-label {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.detail-content {
    font-size: 0.95rem;
    color: var(--text-primary);
    line-height: 1.6;
}

.metadata-json {
    background: var(--bg-dark);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    font-size: 0.8rem;
    color: #a78bfa;
    overflow-x: auto;
    max-height: 400px;
    overflow-y: auto;
}

#exactGroupsCount {
    color: #ecc94b;
}

/* =========================
   Footer
   ========================= */

.footer {
    text-align: center;
    padding: var(--spacing-lg) 0;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* =========================
   Utility Classes
   ========================= */

.hidden {
    display: none !important;
}

/* =========================
   Responsive Design
   ========================= */

@media (max-width: 768px) {
    .title {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .search-controls {
        flex-direction: column;
    }

    .limit-input {
        width: 100%;
    }

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

@media (max-width: 480px) {
    .container {
        padding: var(--spacing-sm);
    }

    .header {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .title {
        font-size: 1.75rem;
    }
}

/* =========================
   Pair Analysis Styles
   ========================= */

.similarity-type-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: capitalize;
}

.type-exact {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    color: white;
}

.type-near_exact {
    background: linear-gradient(135deg, #f97316 0%, #ea580c 100%);
    color: white;
}

.type-similar_intent {
    background: linear-gradient(135deg, #eab308 0%, #ca8a04 100%);
    color: white;
}

.type-different {
    background: linear-gradient(135deg, #22c55e 0%, #16a34a 100%);
    color: white;
}

.recommendation-delete_duplicate {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
}

.recommendation-merge {
    background: linear-gradient(135deg, #f97316 0%, #ea580c 100%);
}

.recommendation-keep_both {
    background: linear-gradient(135deg, #22c55e 0%, #16a34a 100%);
}

.recommendation-review {
    background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
}

.duplicate-pair.not-duplicate {
    border-left: 4px solid #22c55e;
    opacity: 0.85;
}

.ai-analysis-detailed {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.1) 0%, rgba(59, 130, 246, 0.1) 100%);
    border-radius: var(--radius-sm);
    padding: 1rem;
    margin-top: 1rem;
    border: 1px solid rgba(139, 92, 246, 0.2);
}

.analysis-row {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.analysis-row:last-child {
    margin-bottom: 0;
}

.analysis-label {
    font-weight: 600;
    color: var(--primary-light);
    white-space: nowrap;
}

.analysis-value {
    color: var(--text-secondary);
    line-height: 1.5;
}

.analysis-row.differences {
    background: rgba(251, 191, 36, 0.1);
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    border-left: 3px solid #f59e0b;
}

.pair-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

/* =========================
   Chat Interface Styles
   ========================= */

.chat-container {
    background: var(--bg-dark);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: 500px;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.chat-message {
    display: flex;
    gap: var(--spacing-sm);
    max-width: 85%;
}

.chat-message.user {
    align-self: flex-end;
}

.chat-message.assistant {
    align-self: flex-start;
}

.message-content {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    line-height: 1.6;
}

.chat-message.user .message-content {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
}

.chat-message.assistant .message-content {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-primary);
}

.message-content ul {
    margin-top: var(--spacing-xs);
    padding-left: var(--spacing-md);
}

.message-content li {
    margin-bottom: 4px;
    color: var(--text-secondary);
}

.chat-input-container {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    border-top: 1px solid var(--border);
    background: var(--bg-card);
}

.chat-input {
    flex: 1;
    padding: 0.75rem 1rem;
    background: var(--bg-dark);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
}

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

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

.chat-send-btn {
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.chat-send-btn:hover {
    transform: scale(1.05);
}

.chat-send-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.chat-info {
    background: rgba(139, 92, 246, 0.1);
    border-color: var(--primary);
}

.chat-duplicates-result {
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--bg-dark);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

.duplicate-pair-mini {
    padding: var(--spacing-xs);
    margin-bottom: var(--spacing-xs);
    background: var(--bg-card);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
}

.duplicate-pair-mini:last-child {
    margin-bottom: 0;
}

/* Sub-tabs for All/My Test Cases */
.sub-tabs {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
    background: var(--bg-dark);
    padding: var(--spacing-xs);
    border-radius: var(--radius-md);
}

.sub-tab {
    flex: 1;
    padding: var(--spacing-sm);
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.sub-tab:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.sub-tab.active {
    background: var(--primary);
    color: white;
}

/* User ID Input Container */
.user-id-container {
    background: var(--bg-card);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    border: 1px solid var(--primary);
}

.user-id-container label {
    display: block;
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.user-id-input {
    width: 100%;
    padding: var(--spacing-sm);
    background: var(--bg-dark);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: monospace;
}

.user-id-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(139, 92, 246, 0.2);
}

/* Pair Actions Container */
.pair-actions {
    display: flex;
    gap: var(--spacing-xs);
}

/* Merge Button */
.merge-btn {
    padding: 0.5rem 1rem;
    background: linear-gradient(135deg, #10b981, #059669);
    border: none;
    border-radius: var(--radius-sm);
    color: white;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.merge-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
}

.merge-btn-small {
    padding: 0.25rem 0.5rem;
    font-size: 0.8rem;
}

/* Modal Overlay */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(4px);
}

.modal-overlay.hidden {
    display: none;
}

.modal-content {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    max-width: 500px;
    width: 90%;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
}

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

.modal-header h3 {
    margin: 0;
    color: var(--text-primary);
}

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

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

.modal-body {
    padding: var(--spacing-md);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    border-top: 1px solid var(--border);
}

/* Merge Direction */
.merge-direction {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    align-items: center;
}

.merge-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--bg-dark);
    border-radius: var(--radius-sm);
    width: 100%;
}

.keep-item {
    border: 2px solid var(--success);
}

.merge-from-item {
    border: 2px solid var(--error);
}

.merge-label {
    font-weight: 600;
    min-width: 60px;
}

.keep-item .merge-label {
    color: var(--success);
}

.merge-from-item .merge-label {
    color: var(--error);
}

.test-id-badge {
    background: var(--primary);
    color: white;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
}

.test-title-preview {
    color: var(--text-secondary);
    font-size: 0.9rem;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 200px;
}

.swap-btn {
    padding: 0.5rem 1rem;
    background: var(--bg-hover);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    cursor: pointer;
}

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

.merge-preview {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    background: rgba(239, 68, 68, 0.1);
    border-left: 3px solid var(--error);
}

.merge-preview p {
    margin: 0;
    color: var(--text-secondary);
}

.btn-cancel {
    padding: 0.75rem 1.5rem;
    background: var(--bg-hover);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
}

.btn-confirm {
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, var(--error), #dc2626);
    border: none;
    border-radius: var(--radius-sm);
    color: white;
    font-weight: 600;
    cursor: pointer;
}

.btn-confirm:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.4);
}

/* AI Merge Button */
.exact-group-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.group-title-row {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.ai-merge-btn {
    padding: 0.5rem 1rem;
    background: linear-gradient(135deg, #8b5cf6, #6366f1);
    border: none;
    border-radius: var(--radius-sm);
    color: white;
    font-weight: 500;
    cursor: pointer;
}

.ai-merge-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.4);
}

.ai-merge-btn:disabled {
    opacity: 0.6;
    cursor: wait;
}

/* AI Recommendation Display */
.ai-recommendation {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.15), rgba(99, 102, 241, 0.1));
    border: 1px solid var(--primary);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.ai-recommendation.hidden {
    display: none;
}

.ai-rec-content h4 {
    color: var(--primary-light);
    margin-bottom: var(--spacing-sm);
}

.ai-rec-content .keep-suggestion {
    color: var(--success);
    font-weight: 600;
}

.ai-rec-content .remove-suggestion {
    color: var(--error);
}

.ai-rec-content .reasoning {
    color: var(--text-secondary);
    font-style: italic;
    margin: var(--spacing-sm) 0;
}

.ai-rec-content .merge-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

/* =========================
   Change Request Agent Styles
   ========================= */

.drop-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background-color: rgba(255, 255, 255, 0.02);
    margin-bottom: var(--spacing-md);
    position: relative;
    min-height: 150px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.drop-zone:hover,
.drop-zone.drag-over {
    border-color: var(--primary);
    background-color: rgba(139, 92, 246, 0.05);
}

.drop-zone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    width: 100%;
}

.drop-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-xs);
    opacity: 0.7;
}

.file-types {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.browse-link {
    color: var(--primary-light);
    text-decoration: underline;
}

.file-input {
    display: none;
}

.file-info {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    background: var(--bg-hover);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    animation: fadeIn 0.3s ease;
}

.file-icon {
    font-size: 1.5rem;
}

.remove-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.2rem;
    cursor: pointer;
    margin-left: var(--spacing-sm);
    padding: 2px 8px;
    border-radius: 4px;
    transition: var(--transition);
}

.remove-btn:hover {
    color: var(--error);
    background: rgba(239, 68, 68, 0.1);
}

/* Impact Results */
.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.summary-box {
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-md);
    background: rgba(139, 92, 246, 0.1);
    border: 1px solid var(--primary-dark);
    border-radius: var(--radius-sm);
}

.impact-card {
    border-left: 4px solid var(--border);
    transition: var(--transition);
}

.impact-card:hover {
    border-left-color: var(--primary);
    transform: translateX(4px);
}

.badge-danger {
    background: rgba(239, 68, 68, 0.2);
    color: #fca5a5;
    border: 1px solid rgba(239, 68, 68, 0.4);
}

.badge-warning {
    background: rgba(245, 158, 11, 0.2);
    color: #fcd34d;
    border: 1px solid rgba(245, 158, 11, 0.4);
}

.badge-info {
    background: rgba(59, 130, 246, 0.2);
    color: #93c5fd;
    border: 1px solid rgba(59, 130, 246, 0.4);
}

.impact-details {
    margin: var(--spacing-sm) 0;
    font-size: 0.95rem;
    color: var(--text-secondary);
    background: rgba(0, 0, 0, 0.2);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
}

.impact-details p {
    margin-bottom: 0.5rem;
}

.impact-details p:last-child {
    margin-bottom: 0;
}

.card-actions {
    margin-top: var(--spacing-sm);
    display: flex;
    justify-content: flex-end;
}

.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-muted);
    background: var(--bg-card);
    border-radius: var(--radius-md);
    border: 1px dashed var(--border);
}

/* =========================
   Cluster-Based Deduplication Styles
   ========================= */

.cluster-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

.cluster-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--border);
}

.cluster-header h3 {
    color: var(--primary-light);
    margin: 0;
}

.similarity-badge {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.9rem;
}

.cluster-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.cluster-item {
    background: rgba(255, 255, 255, 0.03);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    transition: var(--transition);
}

.cluster-item:hover {
    border-color: var(--primary-light);
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.2);
}

/* Drag and Drop States */
.cluster-item[draggable="true"] {
    cursor: grab;
}

.cluster-item[draggable="true"]:active {
    cursor: grabbing;
}

.cluster-item.dragging {
    opacity: 0.5;
    border: 2px dashed var(--primary);
    box-shadow: 0 8px 24px rgba(139, 92, 246, 0.3);
}

.cluster-item.drag-over {
    border: 2px dashed var(--success);
    background: rgba(16, 185, 129, 0.1);
    transform: scale(1.02);
    transition: all 0.2s ease;
}

/* Item Action Buttons */
.item-actions {
    display: flex;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--border);
    flex-wrap: wrap;
}

/* New World-Class Action Buttons */
.btn-action {
    flex: 1;
    min-width: 80px;
    padding: 0.6rem 0.5rem;
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.3rem;
    border: 1px solid transparent;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-action .btn-icon {
    font-size: 1rem;
    line-height: 1;
}

.btn-action .btn-label {
    font-size: 0.65rem;
    opacity: 0.9;
}

/* Primary Action - Edit (Blue) */
.btn-action-primary {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.2), rgba(37, 99, 235, 0.15));
    border-color: rgba(59, 130, 246, 0.4);
    color: #60a5fa;
}

.btn-action-primary:hover {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.35), rgba(37, 99, 235, 0.25));
    border-color: rgba(59, 130, 246, 0.7);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.25);
}

/* Warning Action - Not a Duplicate (Amber) */
.btn-action-warning {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.2), rgba(217, 119, 6, 0.15));
    border-color: rgba(245, 158, 11, 0.4);
    color: #fbbf24;
}

.btn-action-warning:hover {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.35), rgba(217, 119, 6, 0.25));
    border-color: rgba(245, 158, 11, 0.7);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.25);
}

/* Danger Action - Delete (Red) */
.btn-action-danger {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.2), rgba(220, 38, 38, 0.15));
    border-color: rgba(239, 68, 68, 0.4);
    color: #f87171;
}

.btn-action-danger:hover {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.35), rgba(220, 38, 38, 0.25));
    border-color: rgba(239, 68, 68, 0.7);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.25);
}

.btn-action:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

.btn-action:active {
    transform: translateY(0) scale(0.98);
}

/* Drag Handle */
.item-drag-handle {
    cursor: grab;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    transition: all 0.2s ease;
    opacity: 0.5;
}

.item-drag-handle:hover {
    background: rgba(255, 255, 255, 0.1);
    opacity: 1;
    color: var(--primary-light);
}

.item-drag-handle span {
    font-size: 1rem;
}

/* Priority Tags */
.priority-tag {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
}

.priority-critical,
.priority-high {
    background: rgba(239, 68, 68, 0.2);
    color: #f87171;
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.priority-medium {
    background: rgba(245, 158, 11, 0.2);
    color: #fbbf24;
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.priority-low {
    background: rgba(34, 197, 94, 0.2);
    color: #4ade80;
    border: 1px solid rgba(34, 197, 94, 0.3);
}

.item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
    padding-bottom: var(--spacing-xs);
    border-bottom: 1px solid var(--border);
}

.item-body {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.field {
    padding: var(--spacing-xs);
    border-radius: 4px;
    transition: var(--transition);
}

.field-identical {
    opacity: 0.6;
    background: rgba(100, 100, 100, 0.1);
}

.field-conflict {
    background: rgba(245, 158, 11, 0.15);
    border-left: 3px solid #f59e0b;
}

.field-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.25rem;
}

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

.field-value ol {
    margin: 0.5rem 0;
    padding-left: 1.5rem;
}

.field-value li {
    margin-bottom: 0.25rem;
    font-size: 0.85rem;
}

.cluster-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: flex-end;
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border);
}

.merge-cluster-btn,
.mark-unique-btn {
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.merge-cluster-btn {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    border: none;
}

.merge-cluster-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(139, 92, 246, 0.4);
}

.mark-unique-btn {
    background: transparent;
    border: 2px solid var(--border);
    color: var(--text-secondary);
}

.mark-unique-btn:hover {
    border-color: var(--error);
    color: var(--error);
}

/* Analysis Section Styles */
.analysis-section {
    background: rgba(139, 92, 246, 0.05);
    border: 1px solid rgba(139, 92, 246, 0.2);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.why-similar,
.ai-recommendation {
    margin-bottom: var(--spacing-sm);
}

.why-similar:last-child,
.ai-recommendation:last-child {
    margin-bottom: 0;
}

.analysis-icon {
    font-size: 1.2rem;
    margin-right: 0.5rem;
}

.why-similar strong,
.ai-recommendation strong {
    color: var(--primary-light);
    display: inline-block;
    margin-bottom: 0.25rem;
}

.why-similar p,
.ai-recommendation p {
    margin: 0.5rem 0 0 2rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.btn-ai-suggested-tc {
    width: 100%;
    margin-top: var(--spacing-md);
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, #8b5cf6, #6366f1);
    border: none;
    border-radius: var(--radius-sm);
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-ai-suggested-tc:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(139, 92, 246, 0.4);
}

.ai-merge-btn {
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
    border: none;
}

.ai-merge-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
}

/* AI Merge Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.modal-content {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    max-width: 800px;
    width: 90%;
    max-height: 85vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    border: 1px solid var(--border-color);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: linear-gradient(135deg, #8b5cf6, #6366f1);
    color: white;
}

.modal-header h2 {
    margin: 0;
    font-size: 1.4rem;
}

.modal-close {
    background: transparent;
    border: none;
    color: white;
    font-size: 2rem;
    cursor: pointer;
    line-height: 1;
    opacity: 0.8;
    transition: opacity 0.2s;
}

.modal-close:hover {
    opacity: 1;
}

.modal-body {
    padding: var(--spacing-lg);
    overflow-y: auto;
    flex: 1;
}

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

.merged-tc-card {
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
}

.merged-tc-title {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.merged-tc-title .label {
    color: var(--text-muted);
    margin-right: 0.5rem;
}

.merged-tc-title .value {
    color: var(--primary-light);
    font-weight: 600;
}

.merged-tc-section {
    margin-top: var(--spacing-md);
}

.merged-tc-section .label {
    display: block;
    color: var(--text-muted);
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
}

.ai-content {
    background: var(--bg-secondary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    line-height: 1.6;
    white-space: pre-wrap;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    max-height: 400px;
    overflow-y: auto;
}

.code-block {
    background: var(--bg-primary);
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
    margin: var(--spacing-sm) 0;
    overflow-x: auto;
}

/* Professional Test Case Card Styles */
.tc-field {
    margin-bottom: var(--spacing-md);
}

.tc-field-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-xs);
}

.tc-field-value {
    color: var(--text-primary);
    line-height: 1.6;
}

.tc-title-field .title-value {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--primary-light);
}

.tc-field-row {
    display: flex;
    gap: var(--spacing-lg);
}

.priority-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.priority-high,
.priority-critical {
    background: rgba(239, 68, 68, 0.2);
    color: #f87171;
}

.priority-medium {
    background: rgba(245, 158, 11, 0.2);
    color: #fbbf24;
}

.priority-low {
    background: rgba(34, 197, 94, 0.2);
    color: #4ade80;
}

.tc-list,
.tc-steps-list {
    margin: 0;
    padding-left: var(--spacing-lg);
    color: var(--text-secondary);
}

.tc-list li,
.tc-steps-list li {
    margin-bottom: var(--spacing-xs);
    line-height: 1.6;
}

.tc-steps-list {
    counter-reset: step-counter;
    list-style: none;
    padding-left: 0;
}

.tc-steps-list li {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-xs);
}

.tc-steps-list .step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    font-size: 0.75rem;
    font-weight: 700;
    flex-shrink: 0;
}

.btn-success {
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
    border: none;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
}