/* ============================================================================
   PK-NCA Analyzer — Design System & Global Styles
   ============================================================================ */

:root {
    /* Color System — Clinical / Scientific Theme */
    --color-bg: #0a0e1a;
    --color-bg-secondary: #111827;
    --color-bg-tertiary: #1a2236;
    --color-surface: #1e293b;
    --color-surface-hover: #263249;
    --color-surface-active: #2d3b52;

    --color-border: #2a3650;
    --color-border-light: #374765;
    --color-border-focus: #3b82f6;

    --color-text-primary: #f1f5f9;
    --color-text-secondary: #94a3b8;
    --color-text-muted: #64748b;
    --color-text-inverse: #0f172a;

    --color-accent-primary: #3b82f6;
    --color-accent-primary-hover: #2563eb;
    --color-accent-secondary: #06b6d4;
    --color-accent-success: #10b981;
    --color-accent-warning: #f59e0b;
    --color-accent-danger: #ef4444;
    --color-accent-purple: #8b5cf6;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #3b82f6, #06b6d4);
    --gradient-accent: linear-gradient(135deg, #8b5cf6, #3b82f6);
    --gradient-surface: linear-gradient(180deg, #1e293b, #111827);

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
    --font-size-xs: 0.6875rem;
    --font-size-sm: 0.8125rem;
    --font-size-base: 0.9375rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.375rem;
    --font-size-2xl: 1.75rem;
    --font-size-3xl: 2.25rem;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;

    /* Borders & Shadows */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.5);
    --shadow-glow: 0 0 20px rgba(59,130,246,0.15);

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

/* ============================================================================
   Base Reset & Typography
   ============================================================================ */

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    letter-spacing: -0.01em;
}

a {
    color: var(--color-accent-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}
a:hover { color: var(--color-accent-secondary); }

code, pre, .mono {
    font-family: var(--font-mono);
}

/* ============================================================================
   Layout Components
   ============================================================================ */

.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Top Navigation */
.app-header {
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-3) var(--space-6);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(12px);
}

.app-logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.app-logo-icon {
    width: 36px;
    height: 36px;
    background: var(--gradient-primary);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: var(--font-size-sm);
    color: white;
    letter-spacing: -0.5px;
}

.app-logo-text {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-text-primary);
    letter-spacing: -0.02em;
}

.app-logo-version {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    font-weight: 400;
    margin-left: var(--space-1);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

/* Step Indicator / Tab Navigation */
.step-nav {
    display: flex;
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    padding: 0 var(--space-6);
    overflow-x: auto;
}

.step-tab {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-4) var(--space-5);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-muted);
    border-bottom: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    user-select: none;
    background: transparent;
    border-top: none;
    border-left: none;
    border-right: none;
}

.step-tab:hover {
    color: var(--color-text-secondary);
    background: var(--color-surface);
}

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

.step-tab.completed {
    color: var(--color-accent-success);
}

.step-tab .step-num {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xs);
    font-weight: 600;
    background: var(--color-surface);
    border: 1.5px solid var(--color-border);
    transition: all var(--transition-fast);
}

.step-tab.active .step-num {
    background: var(--color-accent-primary);
    border-color: var(--color-accent-primary);
    color: white;
}

.step-tab.completed .step-num {
    background: var(--color-accent-success);
    border-color: var(--color-accent-success);
    color: white;
}

/* Main Content Area */
.main-content {
    flex: 1;
    padding: var(--space-6);
    max-width: 1600px;
    margin: 0 auto;
    width: 100%;
}

.panel {
    display: none;
}
.panel.active {
    display: block;
}

/* ============================================================================
   Card Components
   ============================================================================ */

.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: visible;
    transition: border-color var(--transition-fast);
}

.card:hover {
    border-color: var(--color-border-light);
}

.card-header {
    padding: var(--space-5) var(--space-6);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-header h3 {
    font-size: var(--font-size-base);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.card-header h3 i {
    color: var(--color-accent-primary);
    font-size: var(--font-size-sm);
}

.card-body {
    padding: var(--space-6);
    overflow-y: auto;
}

.card-footer {
    padding: var(--space-4) var(--space-6);
    border-top: 1px solid var(--color-border);
    background: rgba(0,0,0,0.15);
}

/* ============================================================================
   Form Elements
   ============================================================================ */

.form-group {
    margin-bottom: var(--space-5);
}

.form-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-2);
}

.form-input, .form-select, .form-textarea {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    font-family: var(--font-sans);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    outline: none;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.form-textarea {
    min-height: 120px;
    resize: vertical;
    font-family: var(--font-mono);
    font-size: var(--font-size-xs);
    line-height: 1.7;
}

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%2394a3b8' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 10px center;
    background-repeat: no-repeat;
    background-size: 16px;
    padding-right: 36px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-4);
}

.form-hint {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    margin-top: var(--space-1);
}

/* ============================================================================
   Button System
   ============================================================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    font-size: var(--font-size-sm);
    font-weight: 500;
    font-family: var(--font-sans);
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    user-select: none;
    white-space: nowrap;
    text-decoration: none;
}

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

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    border: none;
}
.btn-primary:hover:not(:disabled) {
    filter: brightness(1.1);
    box-shadow: var(--shadow-glow);
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-text-primary);
    border-color: var(--color-border);
}
.btn-secondary:hover:not(:disabled) {
    background: var(--color-surface-hover);
    border-color: var(--color-border-light);
}

.btn-outline {
    background: transparent;
    color: var(--color-accent-primary);
    border-color: var(--color-accent-primary);
}
.btn-outline:hover:not(:disabled) {
    background: rgba(59, 130, 246, 0.1);
}

.btn-danger {
    background: var(--color-accent-danger);
    color: white;
}
.btn-danger:hover:not(:disabled) {
    filter: brightness(1.15);
}

.btn-success {
    background: var(--color-accent-success);
    color: white;
}
.btn-success:hover:not(:disabled) {
    filter: brightness(1.15);
}

.btn-sm {
    padding: var(--space-1) var(--space-3);
    font-size: var(--font-size-xs);
}

.btn-lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--font-size-base);
}

.btn-icon {
    padding: var(--space-2);
    width: 36px;
    height: 36px;
}

/* ============================================================================
   Data Table
   ============================================================================ */

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

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-sm);
}

.data-table th {
    background: var(--color-bg-secondary);
    padding: var(--space-3) var(--space-4);
    text-align: left;
    font-weight: 600;
    font-size: var(--font-size-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-secondary);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 1;
    white-space: nowrap;
}

.data-table td {
    padding: var(--space-2) var(--space-4);
    border-bottom: 1px solid rgba(42, 54, 80, 0.5);
    font-family: var(--font-mono);
    font-size: var(--font-size-xs);
    color: var(--color-text-primary);
    white-space: nowrap;
}

.data-table tr:hover td {
    background: rgba(59, 130, 246, 0.05);
}

.data-table tr.excluded td {
    opacity: 0.4;
    text-decoration: line-through;
}

.data-table tr.highlight td {
    background: rgba(59, 130, 246, 0.1);
}

.data-table .num-right {
    text-align: right;
}

/* ============================================================================
   Results / Parameter Display
   ============================================================================ */

.params-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-4);
}

.param-card {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-4) var(--space-5);
    transition: all var(--transition-fast);
}

.param-card:hover {
    border-color: var(--color-accent-primary);
    box-shadow: var(--shadow-glow);
}

.param-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-1);
}

.param-value {
    font-family: var(--font-mono);
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text-primary);
    letter-spacing: -0.02em;
}

.param-value.highlight {
    color: var(--color-accent-primary);
}

.param-unit {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    margin-left: var(--space-1);
    font-weight: 400;
}

.param-desc {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    margin-top: var(--space-1);
}

/* ============================================================================
   Chart Container
   ============================================================================ */

.chart-container {
    position: relative;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-4);
    min-height: 400px;
}

.chart-controls {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
    flex-wrap: wrap;
}

.chart-toggle {
    display: flex;
    background: var(--color-surface);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    overflow: hidden;
}

.chart-toggle-btn {
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-xs);
    font-weight: 500;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: all var(--transition-fast);
    background: transparent;
    border: none;
    font-family: var(--font-sans);
}

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

.chart-toggle-btn:hover:not(.active) {
    color: var(--color-text-primary);
    background: var(--color-surface-hover);
}

/* D3 Chart Styles */
.chart-svg {
    width: 100%;
    overflow: visible;
}

.chart-svg .axis-label {
    fill: var(--color-text-secondary);
    font-size: 12px;
    font-family: var(--font-sans);
}

.chart-svg .tick text {
    fill: var(--color-text-muted);
    font-size: 11px;
    font-family: var(--font-mono);
}

.chart-svg .tick line,
.chart-svg .domain {
    stroke: var(--color-border);
}

.chart-svg .grid line {
    stroke: var(--color-border);
    stroke-opacity: 0.3;
    stroke-dasharray: 2,3;
}

.chart-svg .data-line {
    fill: none;
    stroke: var(--color-accent-primary);
    stroke-width: 2;
}

.chart-svg .data-point {
    fill: var(--color-accent-primary);
    stroke: var(--color-bg-secondary);
    stroke-width: 2;
    cursor: pointer;
    transition: r 150ms;
}

.chart-svg .data-point:hover {
    r: 7;
}

.chart-svg .data-point.terminal {
    fill: var(--color-accent-danger);
}

.chart-svg .data-point.excluded {
    fill: var(--color-text-muted);
    opacity: 0.5;
}

.chart-svg .regression-line {
    fill: none;
    stroke: var(--color-accent-danger);
    stroke-width: 1.5;
    stroke-dasharray: 6, 3;
}

.chart-svg .auc-fill {
    fill: var(--color-accent-primary);
    opacity: 0.08;
}

.chart-tooltip {
    position: absolute;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-xs);
    font-family: var(--font-mono);
    pointer-events: none;
    z-index: 50;
    box-shadow: var(--shadow-md);
    white-space: nowrap;
}

/* ============================================================================
   Upload / Drop Zone
   ============================================================================ */

.drop-zone {
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-12) var(--space-8);
    text-align: center;
    transition: all var(--transition-base);
    cursor: pointer;
    position: relative;
}

.drop-zone:hover, .drop-zone.drag-over {
    border-color: var(--color-accent-primary);
    background: rgba(59, 130, 246, 0.05);
}

.drop-zone-icon {
    font-size: 48px;
    color: var(--color-text-muted);
    margin-bottom: var(--space-4);
}

.drop-zone-text {
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
    margin-bottom: var(--space-2);
}

.drop-zone-hint {
    color: var(--color-text-muted);
    font-size: var(--font-size-xs);
}

.drop-zone input[type="file"] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}

/* ============================================================================
   Status / Alert Components
   ============================================================================ */

.alert {
    padding: var(--space-4) var(--space-5);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.alert-info {
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.2);
    color: var(--color-accent-primary);
}

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.2);
    color: var(--color-accent-success);
}

.alert-warning {
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.2);
    color: var(--color-accent-warning);
}

.alert-danger {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: var(--color-accent-danger);
}

/* Progress Bar */
.progress-bar {
    height: 4px;
    background: var(--color-bg-secondary);
    border-radius: 2px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 2px;
    transition: width var(--transition-base);
}

/* Badge */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: var(--font-size-xs);
    font-weight: 500;
}

.badge-blue {
    background: rgba(59, 130, 246, 0.15);
    color: var(--color-accent-primary);
}

.badge-green {
    background: rgba(16, 185, 129, 0.15);
    color: var(--color-accent-success);
}

.badge-yellow {
    background: rgba(245, 158, 11, 0.15);
    color: var(--color-accent-warning);
}

.badge-red {
    background: rgba(239, 68, 68, 0.15);
    color: var(--color-accent-danger);
}

/* ============================================================================
   Loading / Spinner
   ============================================================================ */

.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255,255,255,0.2);
    border-top-color: var(--color-accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.loading-overlay {
    position: absolute;
    inset: 0;
    background: rgba(10, 14, 26, 0.8);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-4);
    z-index: 50;
    border-radius: inherit;
    backdrop-filter: blur(4px);
}

/* ============================================================================
   Test Panel
   ============================================================================ */

.test-suite {
    font-family: var(--font-mono);
    font-size: var(--font-size-xs);
}

.test-case {
    padding: var(--space-3) var(--space-4);
    border-left: 3px solid var(--color-border);
    margin-bottom: var(--space-2);
    background: var(--color-bg-secondary);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
}

.test-case.pass {
    border-left-color: var(--color-accent-success);
}

.test-case.fail {
    border-left-color: var(--color-accent-danger);
}

.test-case .test-icon {
    flex-shrink: 0;
    margin-top: 1px;
}

.test-case .test-name {
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: 2px;
}

.test-case .test-detail {
    color: var(--color-text-muted);
    font-size: 10px;
}

/* ============================================================================
   AI Free-form Parse Card
   ============================================================================ */

.ai-parse-card {
    background: linear-gradient(135deg, rgba(139,92,246,0.08), rgba(59,130,246,0.08));
    border: 1px solid rgba(139,92,246,0.25);
}

.ai-parse-card:hover {
    border-color: rgba(139,92,246,0.5);
}

.ai-parse-textarea {
    width: 100%;
    min-height: 160px;
    padding: var(--space-4);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    font-size: var(--font-size-xs);
    font-family: var(--font-mono);
    line-height: 1.7;
    resize: vertical;
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.ai-parse-textarea:focus {
    border-color: var(--color-accent-purple);
    box-shadow: 0 0 0 3px rgba(139,92,246,0.15);
}

.ai-parse-textarea::placeholder {
    color: var(--color-text-muted);
    font-style: italic;
}

.ai-parse-actions {
    display: flex;
    gap: var(--space-2);
    margin-top: var(--space-3);
}

.btn-ai {
    background: linear-gradient(135deg, #8b5cf6, #6366f1);
    color: white;
    border: none;
}
.btn-ai:hover:not(:disabled) {
    filter: brightness(1.15);
    box-shadow: 0 0 16px rgba(139,92,246,0.3);
}

.ai-parse-status {
    font-size: var(--font-size-xs);
    margin-top: var(--space-2);
    min-height: 1.2em;
}

/* Spaghetti Plot Panel */
.spaghetti-panel {
    display: flex;
    gap: var(--space-3);
    overflow-x: auto;
    padding: var(--space-3) 0;
}

.spaghetti-mini {
    min-width: 220px;
    max-width: 280px;
    flex-shrink: 0;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-3);
}

.spaghetti-mini-title {
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-2);
    text-align: center;
}

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

@media (max-width: 1024px) {
    .main-content {
        padding: var(--space-4);
    }
    .params-grid {
        grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    }
}

@media (max-width: 768px) {
    .app-header {
        padding: var(--space-3) var(--space-4);
    }
    .step-nav {
        padding: 0 var(--space-4);
    }
    .step-tab {
        padding: var(--space-3) var(--space-4);
    }
    .main-content {
        padding: var(--space-3);
    }
    .form-row {
        grid-template-columns: 1fr;
    }
    .params-grid {
        grid-template-columns: 1fr;
    }
    .card-body {
        padding: var(--space-4);
    }
}

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

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-sm { font-size: var(--font-size-sm); }
.text-xs { font-size: var(--font-size-xs); }
.text-muted { color: var(--color-text-muted); }
.text-success { color: var(--color-accent-success); }
.text-danger { color: var(--color-accent-danger); }
.text-warning { color: var(--color-accent-warning); }
.font-mono { font-family: var(--font-mono); }
.font-semibold { font-weight: 600; }
.hidden { display: none !important; }
.w-full { width: 100%; }
.overflow-auto { overflow: auto; }
.max-h-96 { max-height: 24rem; overflow-y: auto; }

/* ============================================================================
   Enhanced Card Sizing & Scrollable Data Entry
   ============================================================================ */

/* Balanced card sizing — ensure min-width prevents too-narrow cards */
.card {
    min-width: 0; /* prevent flex/grid overflow */
}

/* Scrollable card body for data-heavy panels */
.card-body.scrollable {
    max-height: 520px;
    overflow-y: auto;
    overflow-x: hidden;
}

/* Scrollable data entry areas */
.data-entry-scroll {
    max-height: 400px;
    overflow-y: auto;
    overflow-x: auto;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-bg-secondary);
}

/* Compact card variant for dense layouts */
.card-compact .card-header {
    padding: var(--space-3) var(--space-4);
}
.card-compact .card-body {
    padding: var(--space-4);
}

/* Form control consistent sizing */
.form-input, .form-select, .form-textarea {
    min-height: 36px;
}

/* ========================================================================
   Global Scrollbar — minimal, dark-mode friendly, unobtrusive
   ======================================================================== */

/* Universal: all elements */
*::-webkit-scrollbar {
    width: 5px;
    height: 5px;
}
*::-webkit-scrollbar-track {
    background: transparent;
}
*::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.08);
    border-radius: 10px;
    transition: background 0.2s;
}
*::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.18);
}
*::-webkit-scrollbar-corner {
    background: transparent;
}

/* Firefox */
* {
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.08) transparent;
}

/* Two-column layout balance for analysis pages */
.analysis-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    align-items: start;
}

@media (max-width: 1200px) {
    .analysis-grid {
        grid-template-columns: 1fr;
    }
}

/* Header actions responsive wrap */
.header-actions {
    flex-wrap: wrap;
    gap: 0.4rem;
}

@media (max-width: 640px) {
    .header-actions .btn-sm {
        padding: var(--space-1) var(--space-2);
        font-size: 0.68rem;
    }
    .header-actions .badge {
        display: none;
    }
}

/* ============================================================================
   Card Overflow & Scrollability Fixes (global)
   ============================================================================ */

/* Ensure card bodies with tall content remain scrollable */
.card-body {
    overflow-y: auto;
    overflow-x: auto;
    max-height: none;
}

/* Prevent card from collapsing too narrow in flex/grid layouts */
.card {
    min-width: 0;
    overflow: visible;
}

/* Textarea scroll in parse cards */
.ai-parse-card .card-body,
.ai-parse-card .ai-parse-textarea {
    overflow-y: auto;
}

/* Table containers always scrollable horizontally */
.table-responsive,
.data-preview,
.interval-table-container,
.results-table-container,
.spreadsheet-wrap {
    overflow-x: auto;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

/* Ensure tables don't compress to unreadable widths */
.data-table,
.results-table,
.interval-table {
    min-width: 500px;
}

/* Graph Studio sidebar scrollable */
.gs-sidebar {
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
}

/* NPS spreadsheet wrap scrollable on both axes */
.spreadsheet-wrap {
    max-height: 500px;
    overflow: auto;
}

/* SS metrics and param tables — prevent clipping */
.ss-metric-grid {
    overflow-x: auto;
}

/* IVIVC panels — ensure scrollable */
.ivivc-results-grid {
    overflow-x: auto;
}

/* Fix narrow cards on small viewports */
@media (max-width: 480px) {
    .card-body {
        padding: var(--space-3);
    }
    .card-header {
        padding: var(--space-3) var(--space-4);
        flex-wrap: wrap;
        gap: var(--space-2);
    }
    .form-row {
        grid-template-columns: 1fr;
    }
    /* Prevent Graph Studio sidebar from taking too much space */
    .gs-layout {
        grid-template-columns: 1fr !important;
    }
    .ai-parse-textarea {
        min-height: 120px;
    }
    .ai-parse-actions {
        flex-wrap: wrap;
    }
}