/**
 * Glass Effects Component - Single Source of Truth
 * Consolidated glass morphism styles
 * Replaces duplicate definitions across multiple files
 * 
 * Note: Requires variables.css to be loaded first
 */

/* Glass SVG Filter Wrapper */
.glass-svg-filter-background {
    position: absolute !important;
    z-index: -1 !important;
}

/* Base Glass Effect */
.glass-base {
    background: linear-gradient(135deg, 
        rgba(var(--glass-primary-rgb), var(--glass-bg-opacity-base)) 0%, 
        rgba(var(--glass-secondary-rgb), 0.08) 50%,
        rgba(var(--glass-primary-rgb), 0.12) 100%);
    border-radius: var(--radius-base);
    border: 1px solid var(--glass-border);
    box-shadow: 
        var(--shadow-lg),
        var(--shadow-sm),
        var(--shadow-inset);
    isolation: isolate;
    position: relative;
    transform: translateZ(0); /* GPU acceleration */
    overflow: hidden;
    
    backdrop-filter: blur(var(--glass-blur-base)) saturate(var(--glass-saturation-base));
    -webkit-backdrop-filter: blur(var(--glass-blur-base)) saturate(var(--glass-saturation-base));
}

/* Glass Highlight Layer */
.glass-base::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    padding: 1px;
    background: linear-gradient(135deg, 
        rgba(255, 255, 255, 0.3) 0%,
        rgba(255, 255, 255, 0.05) 50%,
        rgba(255, 255, 255, 0) 100%);
    -webkit-mask: 
        linear-gradient(#fff 0 0) content-box, 
        linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask: 
        linear-gradient(#fff 0 0) content-box, 
        linear-gradient(#fff 0 0);
    mask-composite: exclude;
    pointer-events: none;
    z-index: 1;
    opacity: var(--glass-highlight-opacity);
    transition: opacity var(--transition-base);
}

/* Glass Illumination Layer */
.glass-base::after {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: inherit;
    background: radial-gradient(
        circle at var(--glass-light-x, 50%) var(--glass-light-y, 0%), 
        rgba(var(--glass-secondary-rgb), 0.2) 0%,
        transparent 60%
    );
    opacity: var(--glass-illumination-opacity);
    pointer-events: none;
    z-index: 0;
    transition: opacity var(--transition-base);
}

/* Hover State */
.glass-base:hover::before {
    opacity: var(--glass-highlight-opacity-hover);
}

.glass-base:hover::after {
    opacity: var(--glass-illumination-opacity-hover);
}

.glass-base:hover {
    transform: translateY(-2px) translateZ(0);
    box-shadow: 
        0 12px 40px rgba(var(--glass-primary-rgb), 0.25),
        0 4px 12px rgba(0, 0, 0, 0.12),
        inset 0 1px 0 rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, var(--glass-border-opacity-hover));
}

/* Ensure content is above glass layers */
.glass-base > * {
    position: relative;
    z-index: 2;
}

/* Glass Variants */

/* Light Glass */
.glass-light {
    background: linear-gradient(135deg, 
        rgba(255, 255, 255, 0.1) 0%, 
        rgba(255, 255, 255, 0.05) 100%);
    backdrop-filter: blur(var(--glass-blur-light)) saturate(var(--glass-saturation-light));
    -webkit-backdrop-filter: blur(var(--glass-blur-light)) saturate(var(--glass-saturation-light));
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 
        0 4px 16px rgba(0, 0, 0, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.glass-light::before {
    opacity: 0.5;
}

.glass-light::after {
    opacity: 0.3;
}

/* Heavy Glass */
.glass-heavy {
    background: linear-gradient(135deg, 
        rgba(var(--glass-primary-rgb), var(--glass-bg-opacity-heavy)) 0%, 
        rgba(var(--glass-secondary-rgb), 0.15) 50%,
        rgba(var(--glass-accent-rgb), 0.2) 100%);
    backdrop-filter: blur(var(--glass-blur-heavy)) saturate(var(--glass-saturation-heavy));
    -webkit-backdrop-filter: blur(var(--glass-blur-heavy)) saturate(var(--glass-saturation-heavy));
    border: 1.5px solid rgba(255, 255, 255, var(--glass-border-opacity-hover));
    box-shadow: 
        0 12px 48px rgba(var(--glass-primary-rgb), 0.2),
        0 4px 16px rgba(0, 0, 0, 0.15),
        inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

.glass-heavy::before {
    opacity: 0.9;
}

.glass-heavy::after {
    opacity: 0.8;
}

/* Subtle Glass */
.glass-subtle {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(8px) saturate(120%);
    -webkit-backdrop-filter: blur(8px) saturate(120%);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 
        0 2px 8px rgba(0, 0, 0, 0.05),
        inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.glass-subtle::before,
.glass-subtle::after {
    display: none;
}

/* Dark Glass */
.glass-dark {
    background: linear-gradient(135deg, 
        rgba(26, 26, 26, 0.9) 0%, 
        rgba(46, 46, 46, 0.8) 100%);
    backdrop-filter: blur(var(--glass-blur-base)) saturate(var(--glass-saturation-base));
    -webkit-backdrop-filter: blur(var(--glass-blur-base)) saturate(var(--glass-saturation-base));
    border: 1px solid rgba(255, 255, 255, 0.15);
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.4),
        var(--shadow-inset);
}

.glass-dark::after {
        background: radial-gradient(
        circle at var(--glass-light-x, 50%) var(--glass-light-y, 0%), 
        rgba(var(--glass-secondary-rgb), 0.15) 0%,
        transparent 60%
    );
}

/* Dark Mode Variants */
.dark-mode .glass-base {
    background: linear-gradient(135deg, 
        rgba(var(--glass-primary-rgb), var(--glass-dark-bg-opacity-base)) 0%, 
        rgba(var(--glass-secondary-rgb), 0.12) 50%,
        rgba(26, 26, 26, 0.25) 100%);
    border-color: rgba(255, 255, 255, var(--glass-dark-border-opacity));
    box-shadow: 
        0 8px 32px rgba(var(--glass-primary-rgb), 0.2),
        0 2px 8px rgba(0, 0, 0, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.12);
}

.dark-mode .glass-base::after {
    background: radial-gradient(
        circle at var(--glass-light-x, 50%) var(--glass-light-y, 0%), 
        rgba(var(--glass-secondary-rgb), 0.25) 0%,
        transparent 60%
    );
}

.dark-mode .glass-base:hover {
    box-shadow: 
        0 12px 40px rgba(var(--glass-primary-rgb), 0.3),
        0 4px 12px rgba(0, 0, 0, 0.25),
        inset 0 1px 0 rgba(255, 255, 255, 0.18);
    border-color: rgba(255, 255, 255, 0.3);
}

.dark-mode .glass-light {
    background: linear-gradient(135deg, 
        rgba(255, 255, 255, 0.08) 0%, 
        rgba(255, 255, 255, 0.03) 100%);
    border-color: rgba(255, 255, 255, 0.12);
}

.dark-mode .glass-heavy {
    background: linear-gradient(135deg, 
        rgba(var(--glass-primary-rgb), 0.3) 0%, 
        rgba(var(--glass-secondary-rgb), 0.2) 50%,
        rgba(26, 26, 26, 0.3) 100%);
    border-color: rgba(255, 255, 255, 0.3);
}

.dark-mode .glass-dark {
    background: linear-gradient(135deg, 
        rgba(0, 0, 0, 0.95) 0%, 
        rgba(26, 26, 26, 0.9) 100%);
    border-color: rgba(255, 255, 255, var(--glass-dark-border-opacity));
}

/* Performance Optimization */
.glass-base,
.glass-light,
.glass-heavy,
.glass-subtle,
.glass-dark {
    will-change: backdrop-filter, transform;
}

/* Glass Button Variants */
.btn-glass {
    background: linear-gradient(135deg, 
        rgba(var(--glass-primary-rgb), 0.2) 0%, 
        rgba(var(--glass-secondary-rgb), 0.15) 100%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-small);
    padding: 0.75em 1.5em;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    color: var(--color-white);
    text-decoration: none;
    display: inline-block;
    box-shadow: 
        var(--shadow-md),
        var(--shadow-inset);
    isolation: isolate;
    position: relative;
    
    backdrop-filter: blur(var(--glass-blur-base)) saturate(var(--glass-saturation-base));
    -webkit-backdrop-filter: blur(var(--glass-blur-base)) saturate(var(--glass-saturation-base));
}

.btn-glass::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-small);
    padding: 1px;
    background: linear-gradient(135deg, 
        rgba(255, 255, 255, 0.3) 0%,
        rgba(255, 255, 255, 0.05) 50%,
        rgba(255, 255, 255, 0) 100%);
    -webkit-mask: 
        linear-gradient(#fff 0 0) content-box, 
        linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask: 
        linear-gradient(#fff 0 0) content-box, 
        linear-gradient(#fff 0 0);
    mask-composite: exclude;
    opacity: var(--glass-highlight-opacity);
    transition: opacity var(--transition-base);
    pointer-events: none;
    z-index: 1;
}

.btn-glass:hover {
    transform: translateY(-2px);
    box-shadow: 
        0 8px 24px rgba(var(--glass-primary-rgb), 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, var(--glass-border-opacity-hover));
    background: linear-gradient(135deg, 
        rgba(var(--glass-primary-rgb), 0.3) 0%, 
        rgba(var(--glass-secondary-rgb), 0.2) 100%);
}

.btn-glass:hover::before {
    opacity: var(--glass-highlight-opacity-hover);
}

.btn-glass:active {
    transform: translateY(0);
}

.btn-glass:focus {
    outline: 2px solid rgba(var(--glass-primary-rgb), 0.5);
    outline-offset: 2px;
}

.btn-glass:focus:not(:focus-visible) {
    outline: none;
}

/* Button Variants */
.btn-glass-primary {
    background: linear-gradient(135deg, 
        rgba(var(--glass-primary-rgb), 0.3) 0%, 
        rgba(var(--glass-primary-rgb), 0.25) 100%);
    border-color: rgba(var(--glass-primary-rgb), 0.4);
}

.btn-glass-primary:hover {
    background: linear-gradient(135deg, 
        rgba(var(--glass-primary-rgb), 0.4) 0%, 
        rgba(var(--glass-primary-rgb), 0.35) 100%);
    border-color: rgba(var(--glass-primary-rgb), 0.6);
}

.btn-glass-secondary {
    background: linear-gradient(135deg, 
        rgba(var(--glass-secondary-rgb), 0.2) 0%, 
        rgba(var(--glass-secondary-rgb), 0.15) 100%);
    border-color: rgba(var(--glass-secondary-rgb), 0.3);
}

.btn-glass-secondary:hover {
    background: linear-gradient(135deg, 
        rgba(var(--glass-secondary-rgb), 0.3) 0%, 
        rgba(var(--glass-secondary-rgb), 0.25) 100%);
    border-color: rgba(var(--glass-secondary-rgb), 0.5);
}

.btn-glass-ghost {
    background: transparent;
    border-color: rgba(255, 255, 255, 0.2);
    box-shadow: none;
}

.btn-glass-ghost:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.3);
    box-shadow: var(--shadow-sm);
}

.btn-glass-ghost:focus {
    outline-color: rgba(255, 255, 255, 0.4);
}

.dark-mode .btn-glass {
    background: linear-gradient(135deg, 
        rgba(var(--glass-primary-rgb), 0.25) 0%, 
        rgba(var(--glass-secondary-rgb), 0.18) 100%);
    border-color: rgba(255, 255, 255, var(--glass-dark-border-opacity));
}


/* Fallback for browsers without backdrop-filter */
@supports not (backdrop-filter: blur(1px)) {
    .glass-base,
    .glass-light,
    .glass-heavy,
    .glass-subtle,
    .glass-dark {
        background: rgba(26, 26, 26, 0.95);
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
        border: 1px solid rgba(255, 255, 255, 0.3);
    }
    
    .glass-light {
        background: rgba(255, 255, 255, 0.15);
    }
    
    .glass-heavy {
        background: rgba(26, 26, 26, 0.98);
    }
    
    .glass-subtle {
        background: rgba(255, 255, 255, 0.08);
    }
    
    .glass-dark {
        background: rgba(0, 0, 0, 0.95);
    }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    .glass-base,
    .glass-light,
    .glass-heavy,
    .glass-subtle,
    .glass-dark {
        transition: none;
    }
    
    .glass-base:hover {
        transform: none;
    }
}