/* ===== Global Optimizations & Utilities ===== */

/* Performance: GPU-accelerated transforms */
.gpu-accelerated {
    transform: translateZ(0);
    will-change: transform;
}

/* Accessibility: Focus visible for keyboard navigation */
*:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 3px;
    border-radius: 4px;
}

/* Remove outline for mouse users */
*:focus:not(:focus-visible) {
    outline: none;
}

/* Improved text selection */
::selection {
    background-color: var(--primary);
    color: white;
}

::-moz-selection {
    background-color: var(--primary);
    color: white;
}

/* Smooth scrolling for reduced motion preference */
@media (prefers-reduced-motion: no-preference) {
    html {
        scroll-behavior: smooth;
    }
}

/* Respect user's 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;
    }
}

/* Container Query Support */
@supports (container-type: inline-size) {
    .container-query {
        container-type: inline-size;
    }
}

/* Improved link accessibility */
a:not([class]) {
    text-decoration-skip-ink: auto;
}

/* Better list styling */
ul[role="list"],
ol[role="list"] {
    list-style: none;
    padding: 0;
}

/* Image optimization */
img,
picture,
video,
canvas,
svg {
    display: block;
    max-width: 100%;
    height: auto;
}

/* Font smoothing for better readability */
body {
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Remove default button styling */
button {
    font: inherit;
    cursor: pointer;
}

/* Utility: Visually hidden but accessible to screen readers */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

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

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--primary);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

/* Error states */
.error {
    color: var(--danger);
    border-color: var(--danger);
}

/* Success states */
.success {
    color: var(--success);
    border-color: var(--success);
}

/* Spacing utilities */
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.p-1 { padding: 0.5rem; }
.p-2 { padding: 1rem; }
.p-3 { padding: 1.5rem; }
.p-4 { padding: 2rem; }

/* Flexbox utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.gap-3 { gap: 1.5rem; }

/* Grid utilities */
.grid { display: grid; }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

/* Text utilities */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-medium { font-weight: 500; }

/* Responsive visibility */
@media (max-width: 768px) {
    .hide-mobile { display: none !important; }
}

@media (min-width: 769px) {
    .show-mobile { display: none !important; }
}

/* Print styles */
@media print {
    *,
    *::before,
    *::after {
        background: white !important;
        color: black !important;
        box-shadow: none !important;
        text-shadow: none !important;
    }
    
    a,
    a:visited {
        text-decoration: underline;
    }
    
    a[href]::after {
        content: " (" attr(href) ")";
    }
    
    abbr[title]::after {
        content: " (" attr(title) ")";
    }
    
    pre,
    blockquote {
        border: 1px solid #999;
        page-break-inside: avoid;
    }
    
    thead {
        display: table-header-group;
    }
    
    tr,
    img {
        page-break-inside: avoid;
    }
    
    img {
        max-width: 100% !important;
    }
    
    p,
    h2,
    h3 {
        orphans: 3;
        widows: 3;
    }
    
    h2,
    h3 {
        page-break-after: avoid;
    }
}

/* Dark mode support (future-ready) */
@media (prefers-color-scheme: dark) {
    /* Already handled in main styles, but placeholder for additional tweaks */
}

/* High contrast mode */
@media (prefers-contrast: high) {
    * {
        border-color: currentColor;
    }
    
    button,
    a {
        border: 2px solid currentColor;
    }
}