/* Performance and Accessibility Enhancements */

/* Focus indicators for better accessibility */
*:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

.btn:focus,
.nav-link:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

/* Skip to main content link */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--primary-color);
    color: white;
    padding: 8px;
    text-decoration: none;
    border-radius: var(--radius-sm);
    z-index: 10000;
    transition: top 0.3s;
}

.skip-link:focus {
    top: 6px;
}

/* Reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    .earth-grid {
        animation: none;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --text-color: #000000;
        --background-color: #ffffff;
        --primary-color: #000000;
        --accent-color: #ffff00;
        --border-color: #000000;
    }
    
    .btn-secondary {
        border: 3px solid var(--primary-color);
    }
}

/* Print styles */
@media print {
    .header,
    .footer,
    .nav-toggle,
    .hero-visual,
    .cta {
        display: none;
    }
    
    main {
        margin-top: 0;
    }
    
    .container {
        max-width: none;
        padding: 0;
    }
    
    section {
        padding: 1rem 0;
        page-break-inside: avoid;
    }
    
    .card,
    .stage-card,
    .capability-card {
        break-inside: avoid;
        border: 1px solid #ccc;
    }
}

/* Loading states */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

/* Error states */
.error {
    color: #d32f2f;
    background-color: #ffebee;
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    border: 1px solid #d32f2f;
}

/* Success states */
.success {
    color: #2e7d32;
    background-color: #e8f5e8;
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    border: 1px solid #2e7d32;
}

/* Enhanced button states */
.btn:active {
    transform: translateY(1px);
}

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

/* Better form styling */
input[type="text"],
input[type="email"],
input[type="tel"],
textarea,
select {
    width: 100%;
    padding: var(--spacing-sm);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-family: var(--font-body);
    font-size: 16px;
    transition: border-color 0.2s ease;
}

input:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--accent-color);
}

/* Performance optimizations */
.gpu-accelerated {
    transform: translateZ(0);
    backface-visibility: hidden;
    perspective: 1000px;
}

.will-change-transform {
    will-change: transform;
}

/* Smooth scrolling for better performance */
html {
    scroll-behavior: smooth;
}

/* Image optimization */
img {
    max-width: 100%;
    height: auto;
    loading: lazy;
}

/* Table styling */
table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-md) 0;
}

th,
td {
    padding: var(--spacing-sm);
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background-color: var(--secondary-background);
    font-weight: 600;
}

/* Code blocks */
code {
    background-color: var(--secondary-background);
    padding: 2px 4px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

pre {
    background-color: var(--secondary-background);
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
    overflow-x: auto;
}

pre code {
    background: none;
    padding: 0;
}

/* Blockquote styling */
blockquote {
    border-left: 4px solid var(--accent-color);
    padding-left: var(--spacing-md);
    margin: var(--spacing-md) 0;
    font-style: italic;
    color: var(--text-light);
}

/* Utility classes for accessibility */
.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;
}

.not-sr-only {
    position: static;
    width: auto;
    height: auto;
    padding: 0;
    margin: 0;
    overflow: visible;
    clip: auto;
    white-space: normal;
}

/* Enhanced card hover effects */
.card-hover {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.card-hover:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-large);
}

/* Better link styling */
.external-link::after {
    content: "↗";
    margin-left: 4px;
    font-size: 0.8em;
}

/* Progress indicator */
.progress {
    width: 100%;
    height: 4px;
    background-color: var(--secondary-background);
    border-radius: 2px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background-color: var(--accent-color);
    transition: width 0.3s ease;
}

/* Badge styling */
.badge {
    display: inline-block;
    padding: 4px 8px;
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: 12px;
    background-color: var(--accent-color);
    color: var(--primary-color);
}

/* Tooltip styling */
.tooltip {
    position: relative;
    cursor: help;
}

.tooltip::before {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--primary-color);
    color: white;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
}

.tooltip::after {
    content: "";
    position: absolute;
    bottom: 115%;
    left: 50%;
    transform: translateX(-50%);
    border: 4px solid transparent;
    border-top-color: var(--primary-color);
    opacity: 0;
    pointer-events: none;
}

.tooltip:hover::before,
.tooltip:hover::after {
    opacity: 1;
}