/**
 * Back to Top Button Styles
 * 
 * Modern CSS with WordPress theme integration support
 * 
 * @package LVBL Excellence Companion
 * @since 1.0.0
 */

/* Back to Top Progress Indicator */
.progress-wrap {
    position: fixed;
    right: 50px;
    bottom: 50px;
    height: 46px;
    width: 46px;
    cursor: pointer;
    display: block;
    border-radius: 50px;
    box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.2);
    z-index: 10000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(15px);
    transition: all 200ms linear;
    background-color: rgba(0, 123, 186, 0.8);
    
    /* Mobile-specific fixes for iOS and Android */
    -webkit-transform: translateY(15px) translate3d(0, 0, 0);
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    will-change: transform, opacity;
    
    /* Ensure button is clickable on mobile */
    pointer-events: auto;
    -webkit-tap-highlight-color: transparent;
}

.progress-wrap.active-progress {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    -webkit-transform: translateY(0) translate3d(0, 0, 0);
}

/* Up arrow indicator */
.progress-wrap::after {
    position: absolute;
    content: '↑';
    text-align: center;
    line-height: 46px;
    font-size: 20px;
    font-weight: bold;
    color: rgba(255, 255, 255, 0.8);
    left: 0;
    top: 0;
    height: 46px;
    width: 46px;
    cursor: pointer;
    display: block;
    z-index: 1;
    transition: all 200ms linear;
}

.progress-wrap:hover::after {
    color: #fff;
}

/* SVG Progress Circle */
.progress-wrap .progress-circle {
    width: 46px;
    height: 46px;
}

.progress-wrap .progress-circle path {
    stroke: rgba(255, 255, 255, 0.8);
    stroke-width: 4;
    fill: none;
    box-sizing: border-box;
    transition: stroke 200ms linear;
}

.progress-wrap:hover .progress-circle path {
    stroke: #fff;
}

/* No progress variant */
.progress-wrap.no-progress .progress-circle {
    display: none;
}

.progress-wrap.no-progress {
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

/* Responsive Design */
@media (max-width: 768px) {
    .progress-wrap {
        right: 20px;
        bottom: 20px;
        height: 40px;
        width: 40px;
        
        /* Enhanced mobile fixes */
        position: fixed;
        -webkit-transform: translateY(15px) translate3d(0, 0, 0);
        transform: translateY(15px) translate3d(0, 0, 0);
        
        /* Ensure proper stacking and rendering on mobile */
        isolation: isolate;
        
        /* Prevent layout shifts */
        contain: layout style;
    }
    
    .progress-wrap.active-progress {
        -webkit-transform: translateY(0) translate3d(0, 0, 0);
        transform: translateY(0) translate3d(0, 0, 0);
    }
    
    .progress-wrap::after {
        line-height: 40px;
        height: 40px;
        width: 40px;
        font-size: 18px;
    }
    
    .progress-wrap .progress-circle {
        width: 40px;
        height: 40px;
    }
}

/* Accessibility Improvements */
.progress-wrap:focus {
    outline: 2px solid #ffffff;
    outline-offset: 2px;
}

.progress-wrap:focus::after {
    color: #fff;
}

.progress-wrap:focus .progress-circle path {
    stroke: #fff;
}

/* Animation for smooth appearance */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(15px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeOutDown {
    from {
        opacity: 1;
        transform: translateY(0);
    }
    to {
        opacity: 0;
        transform: translateY(15px);
    }
}

/* Enhanced animations when class is toggled */
.progress-wrap.animate-in {
    animation: fadeInUp 200ms ease-out forwards;
}

.progress-wrap.animate-out {
    animation: fadeOutDown 200ms ease-out forwards;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .progress-wrap {
        background-color: #000000;
        border: 2px solid #ffffff;
    }
    
    .progress-wrap::after {
        color: #ffffff;
    }
    
    .progress-wrap .progress-circle path {
        stroke: #ffffff;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .progress-wrap,
    .progress-wrap::after,
    .progress-wrap .progress-circle path {
        transition: none;
    }
    
    .progress-wrap.animate-in,
    .progress-wrap.animate-out {
        animation: none;
    }
}

/* Dark mode support (if theme uses CSS custom properties) */
@media (prefers-color-scheme: dark) {
    .progress-wrap {
        background-color: rgba(255, 255, 255, 0.1);
        box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.3);
    }
    
    .progress-wrap::after {
        color: rgba(255, 255, 255, 0.9);
    }
    
    .progress-wrap .progress-circle path {
        stroke: rgba(255, 255, 255, 0.9);
    }
}

/* Custom properties for theme integration */
.progress-wrap {
    /* Allow themes to override these */
    background-color: var(--back-to-top-bg-color, rgba(0, 123, 186, 0.8));
    width: var(--back-to-top-size, 46px);
    height: var(--back-to-top-size, 46px);
    bottom: var(--back-to-top-bottom, 50px);
    right: var(--back-to-top-right, 50px);
}

.progress-wrap::after {
    color: var(--back-to-top-text-color, rgba(255, 255, 255, 0.8));
    line-height: var(--back-to-top-size, 46px);
    height: var(--back-to-top-size, 46px);
    width: var(--back-to-top-size, 46px);
}

.progress-wrap .progress-circle {
    width: var(--back-to-top-size, 46px);
    height: var(--back-to-top-size, 46px);
}

.progress-wrap .progress-circle path {
    stroke: var(--back-to-top-progress-color, rgba(255, 255, 255, 0.8));
}

/* Hover states using custom properties */
.progress-wrap:hover::after {
    color: var(--back-to-top-text-color-hover, #fff);
}

.progress-wrap:hover .progress-circle path {
    stroke: var(--back-to-top-progress-color-hover, #fff);
}