/* =====================================================
   KFT Performance & Premium Animation Enhancements
   ===================================================== */

/* Hardware Acceleration for Smooth Animations */
* {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

/* Force GPU Acceleration */
.navbar,
.card,
.modal,
.btn,
.course-card,
.hero-section,
.stat-card {
    transform: translateZ(0);
    backface-visibility: hidden;
    perspective: 1000px;
    will-change: transform;
}

/* Smooth Scroll Behavior */
html {
    scroll-behavior: smooth;
}

/* Premium Page Transitions */
body {
    transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Premium Button Animations */
.btn,
.btn-primary-modern,
.btn-register-modern {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.btn::before,
.btn-primary-modern::before,
.btn-register-modern::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 0.6s, height 0.6s;
}

.btn:hover::before,
.btn-primary-modern:hover::before,
.btn-register-modern:hover::before {
    width: 300px;
    height: 300px;
}

.btn:hover,
.btn-primary-modern:hover,
.btn-register-modern:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.btn:active,
.btn-primary-modern:active,
.btn-register-modern:active {
    transform: translateY(0);
    transition: transform 0.1s;
}

/* Card Hover Effects - Premium */
.course-card,
.stat-card,
.card {
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.course-card:hover,
.stat-card:hover,
.card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.12);
}

/* Navigation Smooth Transitions */
.navbar {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-link {
    position: relative;
    transition: color 0.3s ease;
    overflow: hidden;
    /* Prevent line overflow */
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    transform: translateX(-50%);
    will-change: width;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 80%;
}

/* Dark Mode Toggle - Prevent Animation Artifacts */
#darkModeToggleDesktop,
#darkModeToggleMobile {
    cursor: pointer !important;
    position: relative;
    z-index: 100;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

#darkModeToggleDesktop:active,
#darkModeToggleMobile:active {
    transform: scale(0.95);
    transition: transform 0.1s ease;
}

/* Modal Animations - Premium Entrance */
.modal.fade .modal-dialog {
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    transform: scale(0.8) translateY(-50px);
}

.modal.show .modal-dialog {
    transform: scale(1) translateY(0);
}

/* Form Input Focus Effects */
.form-control,
.form-select {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.form-control:focus,
.form-select:focus {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
}

/* Loading Animation - Skeleton Screens */
@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }

    100% {
        background-position: 1000px 0;
    }
}

.skeleton {
    animation: shimmer 2s infinite linear;
    background: linear-gradient(to right,
            var(--bg-secondary) 0%,
            var(--bg-light) 20%,
            var(--bg-secondary) 40%,
            var(--bg-secondary) 100%);
    background-size: 1000px 100%;
}

/* Fade In Animation for Page Elements */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

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

.fade-in-up {
    animation: fadeInUp 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

/* Stagger Animation for Lists */
.stagger-item {
    opacity: 0;
    animation: fadeInUp 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.stagger-item:nth-child(1) {
    animation-delay: 0.1s;
}

.stagger-item:nth-child(2) {
    animation-delay: 0.2s;
}

.stagger-item:nth-child(3) {
    animation-delay: 0.3s;
}

.stagger-item:nth-child(4) {
    animation-delay: 0.4s;
}

.stagger-item:nth-child(5) {
    animation-delay: 0.5s;
}

.stagger-item:nth-child(6) {
    animation-delay: 0.6s;
}

/* Progress Bar Animation */
.progress-bar {
    transition: width 1s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Ripple Effect for Clicks */
@keyframes ripple {
    to {
        transform: scale(4);
        opacity: 0;
    }
}

.ripple {
    position: relative;
    overflow: hidden;
}

.ripple::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    transform: translate(-50%, -50%) scale(0);
    pointer-events: none;
}

.ripple:active::after {
    animation: ripple 0.6s ease-out;
}

/* Icon Animations */
.bi {
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn:hover .bi,
a:hover .bi {
    transform: scale(1.1);
}

/* Dropdown Smooth Entrance */
.dropdown-menu {
    animation: fadeInUp 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Image Lazy Load Effect */
img {
    transition: opacity 0.3s ease, transform 0.3s ease;
}

img[loading="lazy"] {
    opacity: 0;
}

img.loaded {
    opacity: 1;
}

/* Reduce Motion for Accessibility */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Performance: Contain Layout Shifts */
.contain-layout {
    contain: layout;
}

.contain-paint {
    contain: paint;
}

.contain-strict {
    contain: strict;
}

/* Optimize Repaints */
.optimize-repaint {
    will-change: transform, opacity;
}

/* Dark Mode Transition - Smooth and Clean */
html,
[data-theme="dark"],
body.dark-mode {
    transition: background-color 0.3s cubic-bezier(0.4, 0, 0.2, 1),
        color 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Prevent transition artifacts on theme change */
[data-theme="dark"] *,
body.dark-mode * {
    transition: background-color 0.3s ease,
        color 0.3s ease,
        border-color 0.3s ease;
}

/* Transitioning state - disable pointer events briefly */
body.theme-transitioning {
    pointer-events: none;
}

body.theme-transitioning * {
    pointer-events: none;
}

/* Ensure icons transition smoothly */
.dark-mode-icon {
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Fix button states in dark mode */
[data-theme="dark"] .btn,
body.dark-mode .btn {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Pulse Animation for Notifications */
@keyframes pulse {

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

    50% {
        transform: scale(1.05);
        opacity: 0.8;
    }
}

.pulse {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* Bounce Animation for CTAs */
@keyframes bounce {

    0%,
    20%,
    50%,
    80%,
    100% {
        transform: translateY(0);
    }

    40% {
        transform: translateY(-10px);
    }

    60% {
        transform: translateY(-5px);
    }
}

.bounce {
    animation: bounce 2s ease infinite;
}

/* Glow Effect for Premium Elements */
@keyframes glow {

    0%,
    100% {
        box-shadow: 0 0 5px var(--accent-color),
            0 0 10px var(--accent-color),
            0 0 15px var(--accent-color);
    }

    50% {
        box-shadow: 0 0 10px var(--accent-color),
            0 0 20px var(--accent-color),
            0 0 30px var(--accent-color);
    }
}

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