/* Professional Site Enhancements */

/* Modern CSS Custom Properties */
:root {
    --primary-gradient: linear-gradient(135deg, #ffffff 0%, #f8f9fa 50%, #e9ecef 100%);
    --glass-gradient: linear-gradient(135deg, rgba(255, 255, 255, 0.15), rgba(255, 255, 255, 0.08));
    --shadow-light: 0 8px 32px rgba(255, 255, 255, 0.1);
    --shadow-dark: 0 8px 32px rgba(0, 0, 0, 0.3);
    --blur-amount: 20px;
    --transition-smooth: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Enhanced Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.1);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.3), rgba(255, 255, 255, 0.6));
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.5), rgba(255, 255, 255, 0.8));
}

/* Loading Animation */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #000000 0%, #1a1a1a 50%, #000000 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    opacity: 1;
    transition: opacity 0.5s ease;
}

.loading-overlay.fade-out {
    opacity: 0;
    pointer-events: none;
}

.loader {
    width: 50px;
    height: 50px;
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-top: 3px solid #ffffff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Floating Action Button */
.fab {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    background: var(--primary-gradient);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    box-shadow: var(--shadow-dark);
    transition: var(--transition-smooth);
    z-index: 1000;
    text-decoration: none;
    color: #000;
    font-size: 24px;
}

.fab:hover {
    transform: translateY(-3px) scale(1.1);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.4);
}

/* Tooltip */
.tooltip {
    position: relative;
    display: inline-block;
}

.tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.9);
    color: white;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 14px;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    pointer-events: none;
    z-index: 1000;
}

.tooltip:hover::after {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(-5px);
}

/* Focus Management */
*:focus {
    outline: 2px solid rgba(255, 255, 255, 0.5);
    outline-offset: 2px;
}

button:focus,
a:focus,
input:focus {
    outline: 2px solid rgba(255, 255, 255, 0.7);
    outline-offset: 2px;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    .navbar {
        border-bottom: 3px solid #ffffff;
    }
    
    .nav-link {
        font-weight: 700;
    }
    
    .project-card {
        border: 3px solid rgba(255, 255, 255, 0.8);
    }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .hero::before,
    .navbar::before {
        animation: none;
    }
}

/* Print Styles */
@media print {
    .navbar,
    .fab,
    .footer {
        display: none;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
    
    .hero,
    .about,
    .projects {
        background: white !important;
    }
}

/* Additional Utility Classes */
.glass-card {
    background: var(--glass-gradient);
    backdrop-filter: blur(var(--blur-amount));
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 16px;
}

.text-glow {
    text-shadow: 0 0 20px rgba(255, 255, 255, 0.5);
}

.hover-lift {
    transition: var(--transition-smooth);
}

.hover-lift:hover {
    transform: translateY(-5px);
}

.fade-in {
    opacity: 0;
    animation: fadeInUp 0.6s ease-out forwards;
}

.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Performance Optimizations */
.will-change-transform {
    will-change: transform;
}

.will-change-opacity {
    will-change: opacity;
}

/* Modern Gradient Borders */
.gradient-border {
    position: relative;
    background: var(--glass-gradient);
}

.gradient-border::before {
    content: '';
    position: absolute;
    inset: 0;
    padding: 2px;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.3), rgba(255, 255, 255, 0.1));
    border-radius: inherit;
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask-composite: exclude;
}