/**
 * Apple-inspired CSS Optimizations
 * Hardware Acceleration & Performance
 */

/* ============================================
   HARDWARE ACCELERATION
   ============================================ */

/* Force GPU acceleration for animated elements */
.hero-ultra,
.section-ultra,
.info-card-ultra,
.social-card-ultra,
.payment-card-ultra,
.music-player-ultra,
.settings-btn-ultra,
.music-toggle-btn {
    will-change: transform, opacity;
    transform: translate3d(0, 0, 0);
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    perspective: 1000px;
    -webkit-perspective: 1000px;
}

/* Smooth scrolling với hardware acceleration */
html {
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
}

body {
    transform: translateZ(0);
    -webkit-transform: translateZ(0);
}

/* ============================================
   OPTIMIZED ANIMATIONS
   ============================================ */

/* Sử dụng transform thay vì position/width/height */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translate3d(0, 40px, 0);
    }
    to {
        opacity: 1;
        transform: translate3d(0, 0, 0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale3d(0.9, 0.9, 1);
    }
    to {
        opacity: 1;
        transform: scale3d(1, 1, 1);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translate3d(100%, 0, 0);
    }
    to {
        opacity: 1;
        transform: translate3d(0, 0, 0);
    }
}

/* Apply animations với GPU acceleration */
.fade-in-up {
    animation: fadeInUp 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
    will-change: transform, opacity;
}

.scale-in {
    animation: scaleIn 0.4s cubic-bezier(0.4, 0, 0.2, 1) forwards;
    will-change: transform, opacity;
}

.slide-in-right {
    animation: slideInRight 0.5s cubic-bezier(0.4, 0, 0.2, 1) forwards;
    will-change: transform, opacity;
}

/* ============================================
   IMAGE OPTIMIZATION
   ============================================ */

/* Lazy loading images */
img[data-src] {
    opacity: 0;
    transition: opacity 0.3s ease;
    will-change: opacity;
}

img[data-src].loading {
    filter: blur(10px);
    transform: scale(1.05);
}

img[data-src].loaded {
    opacity: 1;
    filter: blur(0);
    transform: scale(1);
}

/* Prevent layout shift */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Aspect ratio containers */
.aspect-ratio {
    position: relative;
    width: 100%;
    padding-bottom: var(--aspect-ratio, 56.25%);
    overflow: hidden;
}

.aspect-ratio > * {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* ============================================
   SCROLL PERFORMANCE
   ============================================ */

/* Smooth scroll với momentum */
.scroll-container {
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    scroll-behavior: smooth;
    will-change: scroll-position;
}

/* Parallax với GPU acceleration */
.parallax-element {
    will-change: transform;
    transform: translate3d(0, 0, 0);
}

/* ============================================
   INTERACTION OPTIMIZATION
   ============================================ */

/* Hover effects với transform */
.interactive-element {
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: transform;
}

.interactive-element:hover {
    transform: translate3d(0, -4px, 0) scale(1.02);
}

.interactive-element:active {
    transform: translate3d(0, -2px, 0) scale(0.98);
    transition-duration: 0.1s;
}

/* Button press effect */
button,
.btn-primary-ultra,
.btn-secondary-ultra {
    transform: translateZ(0);
    -webkit-transform: translateZ(0);
    will-change: transform;
}

button:active,
.btn-primary-ultra:active,
.btn-secondary-ultra:active {
    transform: translate3d(0, 0, 0) scale(0.95);
    transition-duration: 0.1s;
}

/* ============================================
   LAYER MANAGEMENT
   ============================================ */

/* Tạo compositing layers riêng biệt */
.background-container {
    transform: translateZ(0);
    will-change: transform;
    isolation: isolate;
}

.navbar-ultra {
    transform: translateZ(0);
    will-change: transform;
    isolation: isolate;
}

.music-player-ultra,
.settings-ultra,
.music-toggle-ultra {
    transform: translateZ(0);
    will-change: transform;
    isolation: isolate;
}

/* ============================================
   FONT RENDERING
   ============================================ */

/* Optimize font rendering */
body {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

/* ============================================
   CONTENT VISIBILITY (Chrome 85+)
   ============================================ */

/* Defer rendering của content ngoài viewport */
.section-ultra:not(:first-of-type) {
    content-visibility: auto;
    contain-intrinsic-size: 1000px;
}

/* ============================================
   REDUCE PAINT COMPLEXITY
   ============================================ */

/* Sử dụng box-shadow thay vì border khi có thể */
.card-elevated {
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    border: none;
}

/* Optimize gradients */
.gradient-bg {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    /* Thay vì nhiều layers */
}

/* ============================================
   MOBILE OPTIMIZATIONS
   ============================================ */

@media (max-width: 768px) {
    /* Reduce animations on mobile */
    * {
        animation-duration: 0.3s !important;
        transition-duration: 0.2s !important;
    }
    
    /* Disable will-change on mobile để tiết kiệm memory */
    * {
        will-change: auto;
    }
    
    /* Chỉ enable cho elements đang animate */
    .animating {
        will-change: transform, opacity;
    }
}

/* ============================================
   PERFORMANCE MONITORING
   ============================================ */

/* Debug class để track performance */
.debug-performance * {
    outline: 1px solid rgba(255, 0, 0, 0.1);
}

.debug-performance [style*="will-change"] {
    outline: 2px solid rgba(0, 255, 0, 0.3);
}