/**
 * Veelearn Focus Indicators CSS
 * Custom focus styles, visible focus states, skip to content link
 */

/* Skip to content link */
.skip-to-content {
    position: absolute;
    top: -40px;
    left: 0;
    background: #667eea;
    color: white;
    padding: 8px 16px;
    z-index: 10000;
    text-decoration: none;
    font-weight: 600;
    transition: top 0.3s ease;
}

.skip-to-content:focus {
    top: 0;
}

/* Custom focus styles */
:focus {
    outline: 3px solid #667eea;
    outline-offset: 2px;
}

/* High contrast focus for better visibility */
button:focus,
a:focus,
input:focus,
textarea:focus,
select:focus {
    outline: 3px solid #667eea;
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.3);
}

/* Focus visible only when keyboard navigation is used */
:focus:not(:focus-visible) {
    outline: none;
    box-shadow: none;
}

:focus-visible {
    outline: 3px solid #667eea;
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.3);
}

/* Button focus states */
button:focus-visible {
    outline: 3px solid #667eea;
    outline-offset: 2px;
}

/* Input focus states */
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
    outline: 3px solid #667eea;
    outline-offset: 2px;
    border-color: #667eea;
}

/* Link focus states */
a:focus-visible {
    outline: 3px solid #667eea;
    outline-offset: 2px;
    text-decoration: underline;
}

/* Modal focus trap styles */
.modal:focus-within {
    outline: 3px solid #667eea;
    outline-offset: 2px;
}

/* Screen reader only class */
.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;
}

/* Focus indicators for interactive elements */
.interactive-element:focus-visible {
    outline: 3px solid #667eea;
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.3);
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :focus {
        outline-color: #818cf8;
    }

    button:focus,
    a:focus,
    input:focus,
    textarea:focus,
    select:focus {
        outline-color: #818cf8;
        box-shadow: 0 0 0 4px rgba(129, 140, 248, 0.3);
    }

    :focus-visible {
        outline-color: #818cf8;
        box-shadow: 0 0 0 4px rgba(129, 140, 248, 0.3);
    }

    button:focus-visible {
        outline-color: #818cf8;
    }

    input:focus-visible,
    textarea:focus-visible,
    select:focus-visible {
        outline-color: #818cf8;
        border-color: #818cf8;
    }

    a:focus-visible {
        outline-color: #818cf8;
    }

    .modal:focus-within {
        outline-color: #818cf8;
    }

    .interactive-element:focus-visible {
        outline-color: #818cf8;
        box-shadow: 0 0 0 4px rgba(129, 140, 248, 0.3);
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :focus,
    :focus-visible {
        outline-width: 4px;
        outline-offset: 3px;
    }

    button:focus,
    a:focus,
    input:focus,
    textarea:focus,
    select:focus {
        outline-width: 4px;
        outline-offset: 3px;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * {
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
    }

    .skip-to-content {
        transition: none;
    }
}

/* Focus ring for custom components */
.focus-ring {
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.5);
}

.focus-ring:focus-visible {
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.6);
}

/* Focus indicators for dropdown menus */
.dropdown-item:focus-visible {
    background: #f3f4f6;
    outline: 2px solid #667eea;
    outline-offset: -2px;
}

@media (prefers-color-scheme: dark) {
    .dropdown-item:focus-visible {
        background: #374151;
        outline-color: #818cf8;
    }
}

/* Focus indicators for card elements */
.card:focus-visible {
    outline: 3px solid #667eea;
    outline-offset: 4px;
}

/* Focus indicators for list items */
.list-item:focus-visible {
    background: #f3f4f6;
    outline: 2px solid #667eea;
    outline-offset: -2px;
}

@media (prefers-color-scheme: dark) {
    .list-item:focus-visible {
        background: #374151;
        outline-color: #818cf8;
    }
}