/* Animation Keyframes and Transitions */

/* ===== KEYFRAME ANIMATIONS ===== */

@keyframes gradient-shift {

    0%,
    100% {
        background-position: 0% 50%;
    }

    50% {
        background-position: 100% 50%;
    }
}

@keyframes fade-in-up {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slide-in-left {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slide-in-right {
    from {
        opacity: 0;
        transform: translateX(50px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
        transform: scale(1);
    }

    50% {
        opacity: 0.7;
        transform: scale(1.05);
    }
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-20px);
    }
}

@keyframes scale-in {
    from {
        opacity: 0;
        transform: scale(0.9);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

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

/* Glassmorphism Effect */
.glassmorphism {
    background: var(--glass-bg-medium);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
}

/* Scroll-Triggered Animations */
.animate-on-scroll {
    opacity: 0;
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.animate-on-scroll.visible {
    opacity: 1;
}

.fade-in-up {
    transform: translateY(30px);
}

.fade-in-up.visible {
    transform: translateY(0);
}

.slide-in-left {
    transform: translateX(-50px);
}

.slide-in-left.visible {
    transform: translateX(0);
}

.slide-in-right {
    transform: translateX(50px);
}

.slide-in-right.visible {
    transform: translateX(0);
}

.scale-in {
    transform: scale(0.9);
}

.scale-in.visible {
    transform: scale(1);
}

/* Stagger Delay Classes */
.delay-100 {
    transition-delay: 100ms;
}

.delay-200 {
    transition-delay: 200ms;
}

.delay-300 {
    transition-delay: 300ms;
}

.delay-400 {
    transition-delay: 400ms;
}

/* ===== INTERACTIVE TRANSITIONS ===== */

/* Button Hover Effects */
.btn {
    position: relative;
    overflow: hidden;
    transition: all var(--transition-base);
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width var(--transition-slow), height var(--transition-slow);
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

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

/* Card Lift Effect */
.card-lift {
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

/* Link Underline Animation */
.link-underline {
    position: relative;
    display: inline-block;
}

.link-underline::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: currentColor;
    transition: width var(--transition-base);
}

.link-underline:hover::after {
    width: 100%;
}

/* ===== PERFORMANCE OPTIMIZATIONS ===== */

/* GPU Acceleration for Transformed Elements */
.gpu-accelerate {
    will-change: transform;
    transform: translateZ(0);
    backface-visibility: hidden;
}

/* Reduce Will-Change After Animation */
.animate-on-scroll.visible {
    will-change: auto;
}