/* ═══════════════════════════════════════════════════════════════════════════
   AI Dataset Validator — Premium Dark Theme Stylesheet
   ═══════════════════════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* ─── CSS Variables ─────────────────────────────────────────────────────────── */

:root {
    /* Background layers */
    --bg-primary: #0a0e1a;
    --bg-secondary: #111827;
    --bg-card: rgba(17, 24, 39, 0.7);
    --bg-card-hover: rgba(25, 33, 52, 0.85);
    --bg-input: rgba(15, 20, 35, 0.8);
    --bg-overlay: rgba(0, 0, 0, 0.5);

    /* Accent colors */
    --accent-primary: #06d6a0;
    --accent-primary-dim: rgba(6, 214, 160, 0.15);
    --accent-secondary: #118ab2;
    --accent-secondary-dim: rgba(17, 138, 178, 0.15);
    --accent-warning: #ffd166;
    --accent-warning-dim: rgba(255, 209, 102, 0.15);
    --accent-error: #ef476f;
    --accent-error-dim: rgba(239, 71, 111, 0.15);
    --accent-info: #73d2de;
    --accent-info-dim: rgba(115, 210, 222, 0.15);

    /* Text */
    --text-primary: #f0f4f8;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --text-inverse: #0a0e1a;

    /* Borders */
    --border-color: rgba(148, 163, 184, 0.12);
    --border-active: rgba(6, 214, 160, 0.4);

    /* Glassmorphism */
    --glass-bg: rgba(17, 24, 39, 0.6);
    --glass-border: rgba(148, 163, 184, 0.1);
    --glass-blur: 20px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px rgba(6, 214, 160, 0.1);

    /* Spacing */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ─── Reset & Base ──────────────────────────────────────────────────────────── */

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

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

/* Animated background gradient */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse 80% 50% at 20% 20%, rgba(6, 214, 160, 0.06) 0%, transparent 60%),
        radial-gradient(ellipse 60% 40% at 80% 80%, rgba(17, 138, 178, 0.06) 0%, transparent 60%),
        radial-gradient(ellipse 50% 30% at 50% 50%, rgba(239, 71, 111, 0.03) 0%, transparent 60%);
    pointer-events: none;
    z-index: 0;
}

/* ─── Layout ────────────────────────────────────────────────────────────────── */

.app-container {
    position: relative;
    z-index: 1;
    max-width: 1440px;
    margin: 0 auto;
    padding: 20px 24px 40px;
}

/* ─── Header ────────────────────────────────────────────────────────────────── */

.app-header {
    text-align: center;
    padding: 32px 0 24px;
    margin-bottom: 24px;
}

.app-header h1 {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary), var(--accent-info));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.app-header .subtitle {
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.header-badges {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 16px;
    flex-wrap: wrap;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 4px 12px;
    border-radius: 100px;
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-green { background: var(--accent-primary-dim); color: var(--accent-primary); }
.badge-blue { background: var(--accent-secondary-dim); color: var(--accent-secondary); }
.badge-yellow { background: var(--accent-warning-dim); color: var(--accent-warning); }
.badge-red { background: var(--accent-error-dim); color: var(--accent-error); }
.badge-cyan { background: var(--accent-info-dim); color: var(--accent-info); }

/* ─── Tabs ──────────────────────────────────────────────────────────────────── */

.tab-bar {
    display: flex;
    gap: 4px;
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 4px;
    margin-bottom: 24px;
    overflow-x: auto;
}

.tab-btn {
    flex: 1;
    padding: 10px 16px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font-primary);
    font-size: 0.85rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-normal);
    white-space: nowrap;
    position: relative;
}

.tab-btn:hover {
    color: var(--text-primary);
    background: rgba(148, 163, 184, 0.08);
}

.tab-btn.active {
    background: rgba(6, 214, 160, 0.12);
    color: var(--accent-primary);
    font-weight: 600;
}

.tab-panel {
    display: none;
    animation: fadeIn 0.3s ease;
}

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

/* ─── Glass Card ────────────────────────────────────────────────────────────── */

.card {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 20px;
    transition: var(--transition-normal);
}

.card:hover {
    border-color: rgba(148, 163, 184, 0.18);
    box-shadow: var(--shadow-sm);
}

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

.card-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.card-title .icon {
    font-size: 1.2rem;
}

/* ─── Input Area ────────────────────────────────────────────────────────────── */

.input-group {
    display: flex;
    gap: 12px;
    align-items: stretch;
}

.input-group input[type="text"],
.nl-input {
    flex: 1;
    padding: 12px 16px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-primary);
    font-size: 0.95rem;
    transition: var(--transition-fast);
    outline: none;
}

.nl-input:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-primary-dim);
}

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

/* ─── Buttons ───────────────────────────────────────────────────────────────── */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-primary);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0);
    transition: var(--transition-fast);
}

.btn:hover::after {
    background: rgba(255, 255, 255, 0.08);
}

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

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), #04b78a);
    color: var(--text-inverse);
    box-shadow: 0 2px 12px rgba(6, 214, 160, 0.3);
}

.btn-primary:hover {
    box-shadow: 0 4px 20px rgba(6, 214, 160, 0.4);
}

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

.btn-danger {
    background: linear-gradient(135deg, var(--accent-error), #d63a5e);
    color: white;
    box-shadow: 0 2px 12px rgba(239, 71, 111, 0.3);
}

.btn-warning {
    background: linear-gradient(135deg, var(--accent-warning), #e6b84d);
    color: var(--text-inverse);
}

.btn-info {
    background: linear-gradient(135deg, var(--accent-secondary), #0e7a9e);
    color: white;
}

.btn-sm {
    padding: 6px 14px;
    font-size: 0.78rem;
}

.btn-group {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.btn.loading {
    pointer-events: none;
    opacity: 0.7;
}

.btn.loading::before {
    content: '';
    width: 14px;
    height: 14px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

/* ─── JSON Editor ───────────────────────────────────────────────────────────── */

.json-editor {
    position: relative;
}

.json-editor textarea {
    width: 100%;
    min-height: 180px;
    padding: 16px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--accent-info);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.7;
    resize: vertical;
    outline: none;
    transition: var(--transition-fast);
    tab-size: 2;
}

.json-editor textarea:focus {
    border-color: var(--accent-secondary);
    box-shadow: 0 0 0 3px var(--accent-secondary-dim);
}

.editor-toolbar {
    display: flex;
    gap: 8px;
    margin-top: 12px;
}

/* ─── Validation Results ────────────────────────────────────────────────────── */

.validation-results {
    display: none;
    animation: slideUp 0.3s ease;
}

.validation-results.visible {
    display: block;
}

.status-banner {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 18px;
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    font-weight: 600;
    font-size: 0.95rem;
}

.status-banner.valid {
    background: var(--accent-primary-dim);
    color: var(--accent-primary);
    border: 1px solid rgba(6, 214, 160, 0.25);
}

.status-banner.invalid {
    background: var(--accent-error-dim);
    color: var(--accent-error);
    border: 1px solid rgba(239, 71, 111, 0.25);
}

.status-banner.warning {
    background: var(--accent-warning-dim);
    color: var(--accent-warning);
    border: 1px solid rgba(255, 209, 102, 0.25);
}

.checks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 10px;
    margin-bottom: 16px;
}

.check-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
}

.check-icon {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    flex-shrink: 0;
}

.check-icon.pass {
    background: var(--accent-primary-dim);
    color: var(--accent-primary);
}

.check-icon.fail {
    background: var(--accent-error-dim);
    color: var(--accent-error);
}

.check-icon.na {
    background: rgba(100, 116, 139, 0.2);
    color: var(--text-muted);
}

.error-list, .warning-list {
    list-style: none;
    padding: 0;
}

.error-list li, .warning-list li {
    padding: 8px 14px;
    margin-bottom: 6px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-family: var(--font-mono);
    line-height: 1.5;
}

.error-list li {
    background: var(--accent-error-dim);
    color: var(--accent-error);
    border-left: 3px solid var(--accent-error);
}

.warning-list li {
    background: var(--accent-warning-dim);
    color: var(--accent-warning);
    border-left: 3px solid var(--accent-warning);
}

/* ─── Data Table ────────────────────────────────────────────────────────────── */

.data-table-wrap {
    overflow-x: auto;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

.data-table thead {
    background: rgba(6, 214, 160, 0.08);
}

.data-table th {
    padding: 10px 14px;
    text-align: left;
    font-weight: 600;
    color: var(--accent-primary);
    border-bottom: 1px solid var(--border-color);
    white-space: nowrap;
}

.data-table td {
    padding: 8px 14px;
    border-bottom: 1px solid rgba(148, 163, 184, 0.06);
    color: var(--text-secondary);
}

.data-table tbody tr {
    transition: var(--transition-fast);
}

.data-table tbody tr:hover {
    background: rgba(148, 163, 184, 0.04);
}

.data-table tbody tr:last-child td {
    border-bottom: none;
}

.row-count {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 8px;
}

/* ─── Dataset QA ────────────────────────────────────────────────────────────── */

.qa-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 12px;
    margin-bottom: 16px;
}

.qa-stat {
    text-align: center;
    padding: 14px 10px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-md);
}

.qa-stat .value {
    font-size: 1.6rem;
    font-weight: 700;
    display: block;
}

.qa-stat .label {
    font-size: 0.72rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: 4px;
}

.qa-stat.score .value { color: var(--accent-primary); }
.qa-stat.errors .value { color: var(--accent-error); }
.qa-stat.warnings .value { color: var(--accent-warning); }
.qa-stat.info .value { color: var(--accent-info); }

.issue-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 10px 14px;
    margin-bottom: 8px;
    background: rgba(0, 0, 0, 0.15);
    border-radius: var(--radius-sm);
}

.issue-badge {
    padding: 2px 8px;
    border-radius: 100px;
    font-size: 0.68rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    flex-shrink: 0;
    margin-top: 2px;
}

.issue-badge.error { background: var(--accent-error-dim); color: var(--accent-error); }
.issue-badge.warning { background: var(--accent-warning-dim); color: var(--accent-warning); }
.issue-badge.info { background: var(--accent-info-dim); color: var(--accent-info); }

.issue-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ─── Error Injection ───────────────────────────────────────────────────────── */

.injection-modes {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 12px;
}

.injection-card {
    padding: 16px;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-normal);
}

.injection-card:hover {
    border-color: var(--accent-error);
    background: var(--accent-error-dim);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(239, 71, 111, 0.15);
}

.injection-card .mode-name {
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 6px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 6px;
}

.injection-card .mode-desc {
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.4;
}

.injection-result {
    display: none;
    animation: slideUp 0.3s ease;
}

.injection-result.visible {
    display: block;
}

.diff-view {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.diff-panel {
    padding: 14px;
    border-radius: var(--radius-md);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    line-height: 1.7;
    overflow-x: auto;
    white-space: pre-wrap;
    word-break: break-word;
}

.diff-panel.original {
    background: var(--accent-primary-dim);
    border: 1px solid rgba(6, 214, 160, 0.2);
}

.diff-panel.corrupted {
    background: var(--accent-error-dim);
    border: 1px solid rgba(239, 71, 111, 0.2);
}

.diff-label {
    font-family: var(--font-primary);
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
    display: block;
}

/* ─── Analytics Dashboard ───────────────────────────────────────────────────── */

.analytics-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    text-align: center;
    padding: 20px 16px;
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    transition: var(--transition-normal);
}

.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.stat-card .stat-value {
    font-size: 2.2rem;
    font-weight: 800;
    display: block;
    line-height: 1;
    margin-bottom: 6px;
}

.stat-card .stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-card.primary .stat-value { color: var(--accent-primary); }
.stat-card.success .stat-value { color: var(--accent-primary); }
.stat-card.danger .stat-value { color: var(--accent-error); }
.stat-card.warning .stat-value { color: var(--accent-warning); }
.stat-card.info .stat-value { color: var(--accent-info); }

.charts-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 24px;
}

.chart-container {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 20px;
}

.chart-container canvas {
    max-height: 280px;
}

.chart-title {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

/* ─── Function Registry ─────────────────────────────────────────────────────── */

.registry-list {
    display: grid;
    gap: 12px;
}

.registry-item {
    padding: 16px;
    background: rgba(0, 0, 0, 0.15);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: var(--transition-normal);
}

.registry-item:hover {
    border-color: var(--accent-secondary);
}

.registry-item .func-name {
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--accent-info);
    margin-bottom: 4px;
}

.registry-item .func-desc {
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-bottom: 10px;
}

.param-tags {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.param-tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 10px;
    border-radius: 100px;
    font-size: 0.72rem;
    font-family: var(--font-mono);
}

.param-tag.required {
    background: var(--accent-secondary-dim);
    color: var(--accent-secondary);
}

.param-tag.optional {
    background: rgba(100, 116, 139, 0.15);
    color: var(--text-muted);
}

/* ─── Sample Calls ──────────────────────────────────────────────────────────── */

.sample-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.sample-section h3 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.sample-item {
    padding: 12px;
    background: rgba(0, 0, 0, 0.15);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    margin-bottom: 8px;
    cursor: pointer;
    transition: var(--transition-fast);
    font-family: var(--font-mono);
    font-size: 0.78rem;
    line-height: 1.6;
    white-space: pre-wrap;
    word-break: break-word;
    color: var(--text-secondary);
}

.sample-item:hover {
    border-color: var(--accent-secondary);
    background: rgba(17, 138, 178, 0.06);
}

.sample-item.bad:hover {
    border-color: var(--accent-error);
    background: rgba(239, 71, 111, 0.06);
}

/* ─── Recent Runs Table ─────────────────────────────────────────────────────── */

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
    margin-right: 6px;
}

.status-dot.valid { background: var(--accent-primary); box-shadow: 0 0 6px var(--accent-primary); }
.status-dot.invalid { background: var(--accent-error); box-shadow: 0 0 6px var(--accent-error); }
.status-dot.warning { background: var(--accent-warning); box-shadow: 0 0 6px var(--accent-warning); }

/* ─── Skeleton Loader ───────────────────────────────────────────────────────── */

.skeleton {
    background: linear-gradient(90deg,
        rgba(148, 163, 184, 0.08) 25%,
        rgba(148, 163, 184, 0.15) 50%,
        rgba(148, 163, 184, 0.08) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-sm);
}

/* ─── Toast Notifications ───────────────────────────────────────────────────── */

.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast {
    padding: 12px 18px;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: 500;
    backdrop-filter: blur(12px);
    animation: slideInRight 0.3s ease;
    max-width: 360px;
    box-shadow: var(--shadow-lg);
}

.toast.success {
    background: rgba(6, 214, 160, 0.9);
    color: var(--text-inverse);
}

.toast.error {
    background: rgba(239, 71, 111, 0.9);
    color: white;
}

.toast.info {
    background: rgba(17, 138, 178, 0.9);
    color: white;
}

/* ─── Empty State ───────────────────────────────────────────────────────────── */

.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-muted);
}

.empty-state .icon {
    font-size: 2.5rem;
    margin-bottom: 12px;
    opacity: 0.5;
}

.empty-state p {
    font-size: 0.9rem;
}

/* ─── Collapsible Sections ──────────────────────────────────────────────────── */

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    user-select: none;
}

.section-header .toggle-icon {
    transition: var(--transition-fast);
    color: var(--text-muted);
}

.section-header.collapsed .toggle-icon {
    transform: rotate(-90deg);
}

/* ─── Scrollbar ─────────────────────────────────────────────────────────────── */

::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

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

::-webkit-scrollbar-thumb {
    background: rgba(148, 163, 184, 0.2);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(148, 163, 184, 0.35);
}

/* ─── Animations ────────────────────────────────────────────────────────────── */

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideInRight {
    from { opacity: 0; transform: translateX(100px); }
    to { opacity: 1; transform: translateX(0); }
}

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

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* ─── Responsive ────────────────────────────────────────────────────────────── */

@media (max-width: 1024px) {
    .analytics-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .charts-row {
        grid-template-columns: 1fr;
    }
    .diff-view {
        grid-template-columns: 1fr;
    }
    .sample-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .app-container {
        padding: 12px 14px 30px;
    }
    .app-header h1 {
        font-size: 1.5rem;
    }
    .analytics-grid {
        grid-template-columns: 1fr 1fr;
    }
    .tab-btn {
        padding: 8px 12px;
        font-size: 0.78rem;
    }
    .input-group {
        flex-direction: column;
    }
    .checks-grid {
        grid-template-columns: 1fr;
    }
    .injection-modes {
        grid-template-columns: 1fr;
    }
}