/* Modern Smooth Animations - 2025 Standards */

/* Core Animation Properties */
:root {
    --animation-duration-fast: 0.15s;
    --animation-duration-base: 0.3s;
    --animation-duration-slow: 0.6s;
    --animation-timing: cubic-bezier(0.16, 1, 0.3, 1);
    --animation-timing-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
    --animation-timing-ease-out: cubic-bezier(0.215, 0.61, 0.355, 1);
}

/* Smooth Base Transitions */
* {
    transition: opacity var(--animation-duration-base) var(--animation-timing),
                transform var(--animation-duration-base) var(--animation-timing),
                background-color var(--animation-duration-base) var(--animation-timing),
                border-color var(--animation-duration-base) var(--animation-timing),
                box-shadow var(--animation-duration-base) var(--animation-timing);
}

/* Smooth Scroll Behavior */
html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

/* Modern Keyframe Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes gradientShift {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.05);
        opacity: 0.8;
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-10px);
    }
}

@keyframes shimmer {
    0% {
        background-position: -200px 0;
    }
    100% {
        background-position: calc(200px + 100%) 0;
    }
}

/* Animation Classes */
.animate-fade-in-up {
    animation: fadeInUp var(--animation-duration-slow) var(--animation-timing) forwards;
}

.animate-fade-in-scale {
    animation: fadeInScale var(--animation-duration-base) var(--animation-timing) forwards;
}

.animate-slide-in-left {
    animation: slideInLeft var(--animation-duration-slow) var(--animation-timing) forwards;
}

.animate-slide-in-right {
    animation: slideInRight var(--animation-duration-slow) var(--animation-timing) forwards;
}

.animate-gradient {
    background-size: 200% 200%;
    animation: gradientShift 4s ease infinite;
}

.animate-pulse {
    animation: pulse 2s ease-in-out infinite;
}

.animate-float {
    animation: float 3s ease-in-out infinite;
}

.animate-shimmer {
    background: linear-gradient(90deg, 
        var(--bg-secondary) 0px, 
        var(--bg-tertiary) 40px, 
        var(--bg-secondary) 80px);
    background-size: 200px 100%;
    animation: shimmer 1.5s linear infinite;
}

/* Stagger Animation Delays */
.stagger-1 { animation-delay: 0.1s; }
.stagger-2 { animation-delay: 0.2s; }
.stagger-3 { animation-delay: 0.3s; }
.stagger-4 { animation-delay: 0.4s; }
.stagger-5 { animation-delay: 0.5s; }
.stagger-6 { animation-delay: 0.6s; }

/* Hover Animations */
.hover-lift {
    transition: transform var(--animation-duration-base) var(--animation-timing);
}

.hover-lift:hover {
    transform: translateY(-4px);
}

.hover-scale {
    transition: transform var(--animation-duration-base) var(--animation-timing);
}

.hover-scale:hover {
    transform: scale(1.05);
}

.hover-glow {
    transition: box-shadow var(--animation-duration-base) var(--animation-timing);
}

.hover-glow:hover {
    box-shadow: 0 0 20px rgba(102, 126, 234, 0.3);
}

/* Loading States */
.loading-state {
    position: relative;
    overflow: hidden;
}

.loading-state::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, 
        transparent 0%, 
        rgba(255, 255, 255, 0.1) 50%, 
        transparent 100%);
    animation: shimmer 1.5s infinite;
}

/* Scroll Triggered Animations */
.scroll-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity var(--animation-duration-slow) var(--animation-timing),
                transform var(--animation-duration-slow) var(--animation-timing);
}

.scroll-reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Button Animation Enhancements */
.btn-animated {
    position: relative;
    overflow: hidden;
    transform: translateZ(0);
}

.btn-animated::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, 
        transparent 0%, 
        rgba(255, 255, 255, 0.2) 50%, 
        transparent 100%);
    transition: left var(--animation-duration-slow) var(--animation-timing);
}

.btn-animated:hover::before {
    left: 100%;
}

/* Navigation Animations */
.nav-item {
    position: relative;
}

.nav-item::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--animation-duration-base) var(--animation-timing);
}

.nav-item:hover::after {
    width: 100%;
}

/* Card Animations */
.card-animate {
    transition: all var(--animation-duration-base) var(--animation-timing);
}

.card-animate:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-xl);
}

/* Text Animations */
.text-reveal {
    opacity: 0;
    animation: fadeInUp var(--animation-duration-slow) var(--animation-timing) forwards;
}

.text-reveal.delay-1 { animation-delay: 0.2s; }
.text-reveal.delay-2 { animation-delay: 0.4s; }
.text-reveal.delay-3 { animation-delay: 0.6s; }

/* Progress Animations */
.progress-bar {
    position: relative;
    overflow: hidden;
    background: var(--bg-card);
    border-radius: 10px;
    height: 8px;
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 10px;
    transform: translateX(-100%);
    transition: transform var(--animation-duration-slow) var(--animation-timing);
}

.progress-fill.animate {
    transform: translateX(0);
}

/* Mobile Optimizations */
@media (max-width: 768px) {
    :root {
        --animation-duration-fast: 0.1s;
        --animation-duration-base: 0.2s;
        --animation-duration-slow: 0.4s;
    }
    
    .card-animate:hover {
        transform: translateY(-4px);
    }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    .animate-gradient,
    .animate-pulse,
    .animate-float,
    .animate-shimmer {
        animation: none !important;
    }
}

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

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

.transform-gpu {
    transform: translateZ(0);
    backface-visibility: hidden;
    perspective: 1000px;
}

/* High Performance Scroll Animations */
.scroll-trigger {
    transform: translateY(50px);
    opacity: 0;
    transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1),
                opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.scroll-trigger.in-view {
    transform: translateY(0);
    opacity: 1;
}