/**
 * ============================================
 * GLASSMORPHISM COMPONENT SYSTEM
 * Admin UI Modernization
 * ============================================
 *
 * Modern glass effect components with:
 * - Base glass-card class
 * - Glass effect variations (light, medium, heavy)
 * - Glass borders with gradient effects
 * - Inner shadows and highlights
 * - Browser fallbacks for unsupported backdrop-filter
 *
 * Requirements: 1.1, 6.1
 */

/* ===== BASE GLASS CARD ===== */
.glass-card {
    /* Glassmorphism background */
    background: var(--glass-bg);
    backdrop-filter: blur(var(--blur-lg));
    -webkit-backdrop-filter: blur(var(--blur-lg));
    
    /* Border with subtle gradient */
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    
    /* Multi-layered shadow for depth */
    box-shadow: 
        var(--shadow-lg),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    
    /* Positioning for pseudo-elements */
    position: relative;
    overflow: hidden;
    
    /* Smooth transitions */
    transition: var(--transition-all-base);
}

/* Top highlight effect */
.glass-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.2),
        transparent
    );
    pointer-events: none;
}

/* Hover state with elevation */
.glass-card:hover {
    transform: translateY(-2px);
    box-shadow: 
        var(--shadow-xl),
        var(--shadow-glow),
        inset 0 1px 0 rgba(255, 255, 255, 0.15);
    border-color: rgba(99, 102, 241, 0.3);
}

/* Active/pressed state */
.glass-card:active {
    transform: translateY(0);
    box-shadow: 
        var(--shadow-md),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

/* ===== GLASS EFFECT VARIATIONS ===== */

/* Light blur - subtle effect */
.glass-card-light {
    background: var(--glass-bg-light);
    backdrop-filter: blur(var(--blur-md));
    -webkit-backdrop-filter: blur(var(--blur-md));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    position: relative;
    transition: var(--transition-all-base);
}

/* Medium blur - balanced effect (default) */
.glass-card-medium {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--blur-lg));
    -webkit-backdrop-filter: blur(var(--blur-lg));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    position: relative;
    transition: var(--transition-all-base);
}

/* Heavy blur - strong effect */
.glass-card-heavy {
    background: var(--glass-bg-strong);
    backdrop-filter: blur(var(--blur-xl));
    -webkit-backdrop-filter: blur(var(--blur-xl));
    border: 1px solid var(--glass-border-strong);
    border-radius: var(--radius-2xl);
    box-shadow: 
        var(--shadow-xl),
        inset 0 2px 0 rgba(255, 255, 255, 0.15);
    position: relative;
    transition: var(--transition-all-base);
}

/* ===== GLASS BORDERS WITH GRADIENT EFFECTS ===== */

/* Gradient border - primary */
.glass-border-gradient {
    position: relative;
    background: var(--glass-bg);
    backdrop-filter: blur(var(--blur-lg));
    -webkit-backdrop-filter: blur(var(--blur-lg));
    border-radius: var(--radius-xl);
    padding: 1px;
    overflow: hidden;
}

.glass-border-gradient::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    padding: 1px;
    background: var(--gradient-primary);
    -webkit-mask: 
        linear-gradient(#fff 0 0) content-box, 
        linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
}

/* Gradient border - accent */
.glass-border-accent {
    position: relative;
    background: var(--glass-bg);
    backdrop-filter: blur(var(--blur-lg));
    -webkit-backdrop-filter: blur(var(--blur-lg));
    border-radius: var(--radius-xl);
    border: 1px solid transparent;
    background-image: 
        linear-gradient(var(--bg-primary), var(--bg-primary)),
        var(--gradient-accent);
    background-origin: border-box;
    background-clip: padding-box, border-box;
}

/* Animated gradient border */
.glass-border-animated {
    position: relative;
    background: var(--glass-bg);
    backdrop-filter: blur(var(--blur-lg));
    -webkit-backdrop-filter: blur(var(--blur-lg));
    border-radius: var(--radius-xl);
    border: 2px solid transparent;
    background-image: 
        linear-gradient(var(--bg-primary), var(--bg-primary)),
        var(--gradient-rainbow);
    background-origin: border-box;
    background-clip: padding-box, border-box;
    animation: borderRotate 3s linear infinite;
}

@keyframes borderRotate {
    0% {
        filter: hue-rotate(0deg);
    }
    100% {
        filter: hue-rotate(360deg);
    }
}

/* ===== INNER SHADOWS AND HIGHLIGHTS ===== */

/* Inner glow effect */
.glass-inner-glow {
    box-shadow: 
        var(--shadow-lg),
        inset 0 0 20px rgba(99, 102, 241, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

/* Inner shadow for depth */
.glass-inner-shadow {
    box-shadow: 
        var(--shadow-lg),
        inset 0 2px 8px rgba(0, 0, 0, 0.2);
}

/* Top highlight */
.glass-highlight-top::after {
    content: '';
    position: absolute;
    top: 0;
    left: 5%;
    right: 5%;
    height: 2px;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.3),
        transparent
    );
    border-radius: var(--radius-full);
    pointer-events: none;
}

/* Bottom highlight */
.glass-highlight-bottom::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 5%;
    right: 5%;
    height: 1px;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.15),
        transparent
    );
    pointer-events: none;
}

/* Corner highlights */
.glass-corner-highlights::before,
.glass-corner-highlights::after {
    content: '';
    position: absolute;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: radial-gradient(
        circle,
        rgba(255, 255, 255, 0.1) 0%,
        transparent 70%
    );
    pointer-events: none;
}

.glass-corner-highlights::before {
    top: -10px;
    left: -10px;
}

.glass-corner-highlights::after {
    bottom: -10px;
    right: -10px;
}

/* ===== BROWSER FALLBACKS ===== */

/* Fallback for browsers that don't support backdrop-filter */
@supports not (backdrop-filter: blur(16px)) {
    .glass-card,
    .glass-card-light,
    .glass-card-medium,
    .glass-card-heavy,
    .glass-border-gradient,
    .glass-border-accent,
    .glass-border-animated {
        background: var(--bg-secondary);
        border: 1px solid var(--border-color);
    }
    
    .glass-card-heavy {
        background: var(--bg-tertiary);
    }
}

/* Fallback for older WebKit browsers */
@supports not (-webkit-backdrop-filter: blur(16px)) {
    .glass-card,
    .glass-card-light,
    .glass-card-medium,
    .glass-card-heavy {
        background: var(--bg-secondary);
    }
}

/* ===== UTILITY CLASSES ===== */

/* No hover effect */
.glass-card-static {
    cursor: default;
}

.glass-card-static:hover {
    transform: none;
    box-shadow: 
        var(--shadow-lg),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    border-color: var(--glass-border);
}

/* Interactive cursor */
.glass-card-interactive {
    cursor: pointer;
}

/* Disabled state */
.glass-card-disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* ===== GLASS PANEL VARIANTS ===== */

/* Glass panel for sidebar */
.glass-panel-sidebar {
    background: linear-gradient(
        180deg,
        rgba(15, 23, 42, 0.95) 0%,
        rgba(30, 41, 59, 0.95) 100%
    );
    backdrop-filter: blur(var(--blur-xl));
    -webkit-backdrop-filter: blur(var(--blur-xl));
    border-right: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: var(--shadow-xl);
    position: relative;
}

.glass-panel-sidebar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(
        circle at top left,
        rgba(99, 102, 241, 0.1) 0%,
        transparent 50%
    );
    pointer-events: none;
}

/* Glass panel for topbar */
.glass-panel-topbar {
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(var(--blur-xl));
    -webkit-backdrop-filter: blur(var(--blur-xl));
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: var(--shadow-md);
}

/* Glass panel for modal */
.glass-panel-modal {
    background: var(--glass-bg-strong);
    backdrop-filter: blur(var(--blur-2xl));
    -webkit-backdrop-filter: blur(var(--blur-2xl));
    border: 1px solid var(--glass-border-strong);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-2xl);
}

/* ===== GLASS CONTAINER ===== */

/* Container with glass effect */
.glass-container {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--blur-lg));
    -webkit-backdrop-filter: blur(var(--blur-lg));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
}

/* Nested glass container */
.glass-container-nested {
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(var(--blur-md));
    -webkit-backdrop-filter: blur(var(--blur-md));
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
}

/* ===== RESPONSIVE ADJUSTMENTS ===== */

/* Reduce blur on mobile for performance */
@media (max-width: 768px) {
    .glass-card,
    .glass-card-medium {
        backdrop-filter: blur(var(--blur-md));
        -webkit-backdrop-filter: blur(var(--blur-md));
    }
    
    .glass-card-heavy {
        backdrop-filter: blur(var(--blur-lg));
        -webkit-backdrop-filter: blur(var(--blur-lg));
    }
    
    .glass-panel-sidebar,
    .glass-panel-topbar,
    .glass-panel-modal {
        backdrop-filter: blur(var(--blur-lg));
        -webkit-backdrop-filter: blur(var(--blur-lg));
    }
}

/* ===== ACCESSIBILITY ===== */

/* Respect reduced motion preference */
@media (prefers-reduced-motion: reduce) {
    .glass-card,
    .glass-card-light,
    .glass-card-medium,
    .glass-card-heavy,
    .glass-border-animated {
        transition: none;
        animation: none;
    }
}