/* ===================================
   FOCUS MANAGEMENT & ACCESSIBILITY
   Advanced keyboard navigation and focus styles
   =================================== */

/* === Focus Visible (Modern approach) === */
:focus {
    outline: none;
    /* Remove default */
}

:focus-visible {
    outline: 3px solid var(--color-primary-500);
    outline-offset: 3px;
    border-radius: var(--radius-sm);
}

/* === Custom Focus Styles === */
a:focus-visible,
button:focus-visible {
    outline: 3px solid var(--color-primary-500);
    outline-offset: 4px;
    box-shadow: 0 0 0 4px rgba(10, 77, 104, 0.2);
    transition: box-shadow var(--transition-fast);
}

input:focus-visible,
textarea:focus-visible,
select:focus-visible {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
    border-color: var(--color-primary-500);
    box-shadow: 0 0 0 4px rgba(10, 77, 104, 0.1);
}

/* === Skip to Content === */
.skip-to-content {
    position: absolute;
    top: -100px;
    left: 50%;
    transform: translateX(-50%);
    padding: var(--space-3) var(--space-6);
    background: var(--color-primary-600);
    color: white;
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: var(--font-bold);
    z-index: var(--z-tooltip);
    transition: top var(--transition-fast);
}

.skip-to-content:focus {
    top: var(--space-4);
    outline: 3px solid var(--color-secondary-500);
    outline-offset: 3px;
}

/* === Focus Trap (for modals) === */
.focus-trap {
    position: relative;
}

.focus-trap::before,
.focus-trap::after {
    content: '';
    position: absolute;
    width: 0;
    height: 0;
}

/* === Interactive Elements === */
.interactive-element {
    cursor: pointer;
    transition: all var(--transition-fast);
}

.interactive-element:hover {
    transform: translateY(-2px);
}

.interactive-element:active {
    transform: translateY(0);
}

.interactive-element:focus-visible {
    transform: translateY(-2px);
}

/* === Button Focus States === */
.btn-primary:focus-visible {
    outline: 3px solid var(--color-primary-300);
    outline-offset: 4px;
    box-shadow:
        0 0 0 4px rgba(10, 77, 104, 0.2),
        0 10px 30px rgba(10, 77, 104, 0.3);
}

.btn-secondary:focus-visible {
    outline: 3px solid var(--color-secondary-600);
    outline-offset: 4px;
    box-shadow:
        0 0 0 4px rgba(234, 179, 8, 0.2),
        0 10px 30px rgba(234, 179, 8, 0.3);
}

/* === Card Focus === */
.card:focus-within {
    box-shadow:
        0 0 0 3px var(--color-primary-500),
        0 20px 40px rgba(0, 0, 0, 0.15);
    transform: translateY(-4px);
}

/* === Navigation Focus === */
.nav-menu a:focus-visible {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 6px;
    background: rgba(10, 77, 104, 0.1);
    border-radius: var(--radius-md);
}

/* === Checkbox & Radio Focus === */
input[type="checkbox"]:focus-visible,
input[type="radio"]:focus-visible {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 3px;
    box-shadow: 0 0 0 4px rgba(10, 77, 104, 0.15);
}

/* === Focus Within (containers) === */
.has-focus:focus-within {
    border-color: var(--color-primary-500);
    box-shadow: 0 0 0 4px rgba(10, 77, 104, 0.1);
}

/* === Reduced Motion === */
@media (prefers-reduced-motion: reduce) {

    .interactive-element:hover,
    .interactive-element:focus-visible {
        transform: none;
    }

    .card:focus-within {
        transform: none;
    }
}

/* === High Contrast Mode === */
@media (prefers-contrast: high) {
    :focus-visible {
        outline-width: 4px;
        outline-color: currentColor;
    }

    a:focus-visible,
    button:focus-visible {
        outline: 4px solid currentColor;
        outline-offset: 6px;
    }
}

/* === Dark Mode Focus === */
[data-theme="dark"] :focus-visible {
    outline-color: var(--color-primary-400);
}

[data-theme="dark"] a:focus-visible,
[data-theme="dark"] button:focus-visible {
    box-shadow: 0 0 0 4px rgba(5, 191, 219, 0.3);
}

/* === 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;
}

.sr-only-focusable:focus,
.sr-only-focusable:active {
    position: static;
    width: auto;
    height: auto;
    margin: 0;
    overflow: visible;
    clip: auto;
    white-space: normal;
}

/* === Live Regions === */
[aria-live="polite"],
[aria-live="assertive"] {
    position: relative;
}

/* Visual indicator for live regions (dev only) */
[data-dev-mode="true"] [aria-live]::before {
    content: 'Live: ' attr(aria-live);
    position: absolute;
    top: 0;
    right: 0;
    padding: 2px 6px;
    background: #ff0;
    color: #000;
    font-size: 10px;
    font-family: monospace;
    z-index: 9999;
}

/* === Keyboard Navigation Hints === */
[data-keyboard-hint]::after {
    content: attr(data-keyboard-hint);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(-8px);
    padding: var(--space-2) var(--space-3);
    background: var(--color-neutral-900);
    color: white;
    font-size: var(--text-xs);
    white-space: nowrap;
    border-radius: var(--radius-sm);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-fast);
}

[data-keyboard-hint]:focus-visible::after {
    opacity: 1;
}

/* === Tab Index Management === */
[tabindex="-1"]:focus {
    outline: none;
}

/* Only show focus for keyboard navigation */
.js-focus-visible :focus:not(.focus-visible) {
    outline: none;
}

/* === Modal Focus Management === */
.modal[aria-hidden="true"] {
    display: none;
}

.modal[aria-hidden="false"] {
    display: flex;
}

.modal__content:focus {
    outline: none;
}

/* === Focused element indicator === */
body.keyboard-nav *:focus {
    outline: 3px solid var(--color-primary-500);
    outline-offset: 3px;
}

body.mouse-nav *:focus {
    outline: none;
}