/**
 * AAP Playground Styles
 *
 * Design principles:
 * - Accessible (WCAG 2.1 AA)
 * - Cross-browser compatible (Chrome, Firefox, Safari)
 * - Clean, professional aesthetic
 * - Dark mode aware
 */

/* CSS Custom Properties for theming */
:root {
    /* Colors */
    --color-bg: #f8f9fa;
    --color-bg-elevated: #ffffff;
    --color-text: #1a1a2e;
    --color-text-secondary: #4a4a68;
    --color-border: #e1e4e8;
    --color-border-focus: #0366d6;

    /* Status colors */
    --color-success: #28a745;
    --color-success-bg: #d4edda;
    --color-warning: #ffc107;
    --color-warning-bg: #fff3cd;
    --color-error: #dc3545;
    --color-error-bg: #f8d7da;
    --color-info: #17a2b8;
    --color-info-bg: #d1ecf1;

    /* Accent */
    --color-primary: #0066cc;
    --color-primary-hover: #0052a3;
    --color-primary-text: #ffffff;

    /* Typography */
    --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: ui-monospace, "SF Mono", Menlo, Monaco, "Cascadia Mono", monospace;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;

    /* Borders */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

/* Dark mode */
@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #0d1117;
        --color-bg-elevated: #161b22;
        --color-text: #e6edf3;
        --color-text-secondary: #8b949e;
        --color-border: #30363d;
        --color-border-focus: #58a6ff;

        --color-success: #3fb950;
        --color-success-bg: #1a3d2b;
        --color-warning: #d29922;
        --color-warning-bg: #3d2e12;
        --color-error: #f85149;
        --color-error-bg: #4d1a1a;
        --color-info: #58a6ff;
        --color-info-bg: #1a3d5c;

        --color-primary: #58a6ff;
        --color-primary-hover: #79b8ff;
        --color-primary-text: #0d1117;
    }
}

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

/* Base styles */
html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

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

/* Accessibility: Skip link */
.skip-link {
    position: absolute;
    top: -100px;
    left: 0;
    background: var(--color-primary);
    color: var(--color-primary-text);
    padding: var(--space-sm) var(--space-md);
    z-index: 1000;
    text-decoration: none;
    font-weight: 600;
}

.skip-link:focus {
    top: 0;
}

/* Screen reader only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Header */
header {
    background: var(--color-bg-elevated);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-md) var(--space-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.header-content h1 {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 1.5rem;
    font-weight: 700;
}

.header-logo {
    width: 36px;
    height: 36px;
    object-fit: contain;
}

.header-content .logo {
    background: linear-gradient(135deg, var(--color-primary), #6366f1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-content .tagline {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-top: var(--space-xs);
}

header nav {
    display: flex;
    gap: var(--space-md);
}

header nav a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: color var(--transition-fast);
}

header nav a:hover,
header nav a:focus {
    color: var(--color-primary);
}

/* Main content */
main {
    flex: 1;
    padding: var(--space-lg);
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
    position: relative;
}

/* Loading overlay */
.loading-overlay {
    position: fixed;
    inset: 0;
    background: var(--color-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    transition: opacity var(--transition-normal);
}

.loading-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.loading-content {
    text-align: center;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--space-md);
}

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

#loading-status {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

/* Mode selector tabs */
.mode-selector {
    margin-bottom: var(--space-lg);
}

.mode-tabs {
    display: flex;
    gap: var(--space-xs);
    background: var(--color-bg-elevated);
    padding: var(--space-xs);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.mode-tab {
    flex: 1;
    padding: var(--space-sm) var(--space-md);
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
}

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

.mode-tab:focus-visible {
    outline: 2px solid var(--color-border-focus);
    outline-offset: 2px;
}

.mode-tab.active {
    background: var(--color-primary);
    color: var(--color-primary-text);
}

.tab-icon {
    font-size: 1.1em;
}

/* Mode panels */
.mode-panel {
    display: none;
}

.mode-panel.active {
    display: block;
    animation: fadeIn var(--transition-normal);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Panel grid layout */
.panel-grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.input-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--space-lg);
}

/* Input cards */
.input-card {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.input-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.input-header h2 {
    font-size: 1rem;
    font-weight: 600;
}

.input-header select {
    font-family: inherit;
    font-size: 0.8125rem;
    padding: var(--space-xs) var(--space-sm);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-bg);
    color: var(--color-text);
    cursor: pointer;
}

.input-header select:focus {
    outline: 2px solid var(--color-border-focus);
    outline-offset: 1px;
}

/* JSON text areas */
.json-input {
    flex: 1;
    min-height: 300px;
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    line-height: 1.5;
    padding: var(--space-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-bg);
    color: var(--color-text);
    resize: vertical;
    tab-size: 2;
}

.json-input:focus {
    outline: none;
    border-color: var(--color-border-focus);
    box-shadow: 0 0 0 3px rgba(3, 102, 214, 0.1);
}

.json-input.error {
    border-color: var(--color-error);
}

.json-input::placeholder {
    color: var(--color-text-secondary);
    opacity: 0.7;
}

.input-hint {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}

/* Threshold controls */
.threshold-controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
    padding: var(--space-md);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

.threshold-control label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: var(--space-sm);
}

.threshold-control output {
    font-family: var(--font-mono);
    background: var(--color-bg);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    margin-left: var(--space-sm);
}

.threshold-control input[type="range"] {
    width: 100%;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--color-border);
    border-radius: 3px;
    cursor: pointer;
}

.threshold-control input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--color-primary);
    border-radius: 50%;
    border: 2px solid var(--color-bg-elevated);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-fast);
}

.threshold-control input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--color-primary);
    border-radius: 50%;
    border: 2px solid var(--color-bg-elevated);
    box-shadow: var(--shadow-sm);
}

.threshold-control input[type="range"]:hover::-webkit-slider-thumb {
    transform: scale(1.1);
}

.threshold-control input[type="range"]:focus {
    outline: none;
}

.threshold-control input[type="range"]:focus-visible::-webkit-slider-thumb {
    box-shadow: 0 0 0 3px var(--color-border-focus);
}

.threshold-hint {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    margin-top: var(--space-sm);
}

/* Action bar */
.action-bar {
    display: flex;
    justify-content: center;
}

/* Buttons */
.primary-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-xl);
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    background: var(--color-primary);
    color: var(--color-primary-text);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.primary-btn:hover:not(:disabled) {
    background: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.primary-btn:focus-visible {
    outline: 2px solid var(--color-border-focus);
    outline-offset: 2px;
}

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

.primary-btn .btn-icon {
    font-size: 0.8em;
}

.secondary-btn {
    padding: var(--space-xs) var(--space-md);
    font-family: inherit;
    font-size: 0.8125rem;
    font-weight: 500;
    background: var(--color-bg);
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.secondary-btn:focus-visible {
    outline: 2px solid var(--color-border-focus);
    outline-offset: 1px;
}

/* Results section */
.results-section {
    margin-top: var(--space-xl);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
}

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

.results-header h2 {
    font-size: 1.125rem;
    font-weight: 600;
}

.results-actions {
    display: flex;
    gap: var(--space-sm);
}

/* Result status badge */
.result-status {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.9375rem;
    margin-bottom: var(--space-md);
}

.result-status.verified {
    background: var(--color-success-bg);
    color: var(--color-success);
}

.result-status.violations {
    background: var(--color-error-bg);
    color: var(--color-error);
}

.result-status.compatible {
    background: var(--color-success-bg);
    color: var(--color-success);
}

.result-status.incompatible {
    background: var(--color-error-bg);
    color: var(--color-error);
}

.result-status.drift-detected {
    background: var(--color-warning-bg);
    color: var(--color-warning);
}

.result-status.no-drift {
    background: var(--color-success-bg);
    color: var(--color-success);
}

/* Result summary */
.result-summary {
    margin-bottom: var(--space-md);
    font-size: 0.9375rem;
    line-height: 1.7;
}

.result-summary ul {
    margin: var(--space-sm) 0 var(--space-sm) var(--space-lg);
}

.result-summary li {
    margin-bottom: var(--space-xs);
}

.result-summary .violation-item {
    color: var(--color-error);
}

.result-summary .warning-item {
    color: var(--color-warning);
}

.result-summary .match-item {
    color: var(--color-success);
}

/* Result JSON details */
.result-details {
    margin-top: var(--space-md);
}

.result-details summary {
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    padding: var(--space-sm) 0;
}

.result-details summary:hover {
    color: var(--color-text);
}

.result-json {
    margin-top: var(--space-sm);
    padding: var(--space-md);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    line-height: 1.5;
    overflow-x: auto;
    white-space: pre-wrap;
    word-break: break-word;
}

/* AI API docs (hidden) */
.ai-api-docs {
    position: absolute;
    left: -9999px;
}

/* Footer */
footer {
    background: var(--color-bg-elevated);
    border-top: 1px solid var(--color-border);
    padding: var(--space-md) var(--space-lg);
    text-align: center;
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
}

footer a {
    color: var(--color-primary);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

footer .version {
    margin-top: var(--space-xs);
    font-size: 0.75rem;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    header {
        flex-direction: column;
        text-align: center;
    }

    .mode-tabs {
        flex-direction: column;
    }

    .input-section {
        grid-template-columns: 1fr;
    }

    .json-input {
        min-height: 200px;
    }

    .threshold-controls {
        grid-template-columns: 1fr;
    }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ============================================
   SSM Visualization Styles
   ============================================ */

/* Visualization section container */
.ssm-visualization {
    margin-top: var(--space-lg);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
}

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

.viz-header h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
}

/* Visualization tab toggle */
.viz-toggle {
    display: flex;
    gap: var(--space-xs);
    background: var(--color-bg);
    padding: var(--space-xs);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
}

.viz-tab {
    padding: var(--space-xs) var(--space-md);
    font-family: inherit;
    font-size: 0.8125rem;
    font-weight: 500;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.viz-tab.active {
    background: var(--color-primary);
    color: var(--color-primary-text);
}

.viz-tab:focus-visible {
    outline: 2px solid var(--color-border-focus);
    outline-offset: 1px;
}

/* Visualization panels */
.viz-panels {
    margin-bottom: var(--space-md);
}

.viz-panel {
    display: none;
}

.viz-panel.active {
    display: block;
    animation: fadeIn var(--transition-normal);
}

/* Canvas container */
.viz-container {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 280px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: var(--space-sm);
    overflow: hidden;
}

/* SSM Canvas */
.ssm-canvas {
    display: block;
    max-width: 100%;
    height: auto;
}

/* SSM Tooltip */
.ssm-tooltip {
    position: absolute;
    z-index: 100;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: var(--space-sm) var(--space-md);
    box-shadow: var(--shadow-md);
    pointer-events: none;
    font-size: 0.8125rem;
    max-width: 250px;
    transform: translate(0, 0);
}

.ssm-tooltip-title {
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-xs);
    font-family: var(--font-mono);
    font-size: 0.75rem;
}

.ssm-tooltip-value {
    color: var(--color-text);
}

.ssm-tooltip-value.below-threshold {
    color: var(--color-error);
}

.ssm-tooltip-value strong {
    font-family: var(--font-mono);
}

.ssm-tooltip-warning {
    color: var(--color-error);
    font-size: 0.75rem;
    margin-top: var(--space-xs);
    font-weight: 500;
}

.ssm-tooltip-meta {
    color: var(--color-text-secondary);
    font-size: 0.6875rem;
    margin-top: var(--space-xs);
}

/* Visualization caption */
.viz-caption {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    margin-top: var(--space-sm);
    text-align: center;
    line-height: 1.5;
}

/* Visualization statistics */
.viz-stats {
    margin-top: var(--space-md);
}

.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: var(--space-sm);
}

.stat-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: var(--space-sm) var(--space-md);
    text-align: center;
}

.stat-label {
    font-size: 0.6875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--space-xs);
}

.stat-value {
    font-family: var(--font-mono);
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--color-text);
}

.stat-value.below-threshold {
    color: var(--color-error);
}

.stat-value.trend-up {
    color: var(--color-success);
}

.stat-value.trend-down {
    color: var(--color-error);
}

.stat-value.trend-stable {
    color: var(--color-text-secondary);
}

/* Color scale legend (standalone, if needed outside canvas) */
.color-scale {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}

.color-scale-gradient {
    width: 100px;
    height: 12px;
    background: linear-gradient(
        to right,
        rgb(68, 1, 84),
        rgb(64, 67, 135),
        rgb(32, 144, 140),
        rgb(121, 209, 81),
        rgb(253, 231, 37)
    );
    border-radius: 2px;
    border: 1px solid var(--color-border);
}

/* Responsive visualization */
@media (max-width: 768px) {
    .viz-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .viz-container {
        min-height: 220px;
    }

    .stat-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .ssm-tooltip {
        max-width: 200px;
        font-size: 0.75rem;
    }
}

@media (max-width: 480px) {
    .stat-grid {
        grid-template-columns: 1fr;
    }

    .viz-toggle {
        width: 100%;
    }

    .viz-tab {
        flex: 1;
        text-align: center;
    }
}

/* Print styles */
@media print {
    .loading-overlay,
    .action-bar,
    .results-actions,
    header nav,
    footer {
        display: none;
    }

    .json-input {
        border: 1px solid #000;
        min-height: auto;
    }

    .ssm-visualization {
        break-inside: avoid;
    }

    .viz-toggle {
        display: none;
    }

    .viz-panel {
        display: block !important;
    }

    .viz-panel[hidden] {
        display: block !important;
    }
}