/**
 * Display Optimization CSS cho SHRIMPTECH
 * Tối ưu hiển thị, performance và trải nghiệm người dùng
 */

/* ========================================
   CRITICAL RENDERING OPTIMIZATIONS
======================================== */

/* Prevent layout shifts */
* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    padding: 0;
    font-display: swap; /* Ensure text remains visible during font load */
}

/* Critical font loading */
@font-face {
    font-family: 'Inter';
    font-style: normal;
    font-weight: 400;
    font-display: swap;
    src: url('https://fonts.gstatic.com/s/inter/v12/UcCO3FwrK3iLTeHuS_fvQtMwCp50KnMw2boKoduKmMEVuLyfAZ9hiA.woff2') format('woff2');
    unicode-range: U+0000-00FF, U+0131, U+0152-0153;
}

/* ========================================
   LOADING OPTIMIZATIONS
======================================== */

/* Enhanced loading animations */
.loading-overlay {
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
}

.loading-logo svg {
    filter: drop-shadow(0 0 20px rgba(255,255,255,0.3));
}

.loading-spinner {
    position: relative;
}

.loading-spinner::before {
    content: '';
    position: absolute;
    top: -4px;
    left: -4px;
    right: -4px;
    bottom: -4px;
    border: 2px solid transparent;
    border-top: 2px solid rgba(255,255,255,0.6);
    border-radius: 50%;
    animation: spinReverse 2s linear infinite;
}

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

/* Loading progress enhancements */
.loading-progress {
    position: relative;
    box-shadow: inset 0 1px 3px rgba(0,0,0,0.2);
}

.loading-progress-bar {
    box-shadow: 0 0 10px rgba(255,255,255,0.5);
    position: relative;
}

.loading-progress-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255,255,255,0.4),
        transparent
    );
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* ========================================
   CONTENT FADE-IN OPTIMIZATIONS
======================================== */

.main-content {
    will-change: opacity;
    transform: translateZ(0); /* Force hardware acceleration */
}

.main-content.loaded {
    animation: contentFadeIn 0.8s ease-out;
}

@keyframes contentFadeIn {
    0% {
        opacity: 0;
        transform: translateY(20px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================================
   PROGRESSIVE ENHANCEMENT
======================================== */

/* Enhanced for JavaScript enabled */
.js .hero-title {
    opacity: 0;
    animation: titleReveal 1s ease-out 0.5s forwards;
}

.js .hero-description {
    opacity: 0;
    animation: descriptionReveal 1s ease-out 0.8s forwards;
}

.js .hero-buttons {
    opacity: 0;
    animation: buttonsReveal 1s ease-out 1.1s forwards;
}

@keyframes titleReveal {
    0% {
        opacity: 0;
        transform: translateY(30px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes descriptionReveal {
    0% {
        opacity: 0;
        transform: translateY(20px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes buttonsReveal {
    0% {
        opacity: 0;
        transform: translateY(20px) scale(0.9);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* ========================================
   NAVIGATION OPTIMIZATIONS (Note: .navbar base styles in navigation.css)
======================================== */

.navbar-loaded {
    animation: navbarSlideDown 0.6s ease-out;
}

@keyframes navbarSlideDown {
    0% {
        transform: translateY(-100%);
        opacity: 0;
    }
    100% {
        transform: translateY(0);
        opacity: 1;
    }
}

/* Enhanced nav links */
.nav-link {
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.nav-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255,255,255,0.1),
        transparent
    );
    transition: left 0.5s ease;
}

.nav-link:hover::before {
    left: 100%;
}

/* ========================================
   IMAGE OPTIMIZATIONS
======================================== */

img {
    height: auto;
    max-width: 100%;
}

/* Lazy loading placeholders */
img.lazy {
    background: linear-gradient(
        90deg,
        #f0f0f0 25%,
        #e0e0e0 50%,
        #f0f0f0 75%
    );
    background-size: 200% 100%;
    animation: placeholder 1.5s infinite;
}

@keyframes placeholder {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* WebP support */
.webp .hero-image {
    background-image: url('assets/hero-dashboard.webp');
}

.no-webp .hero-image {
    background-image: url('assets/hero-dashboard.svg');
}

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

/* GPU acceleration for animations */
.hero-visual,
.hero-image,
.overview-card,
.feature-item {
    will-change: transform;
    transform: translateZ(0);
}

/* Scroll performance */
.hero,
.overview,
.features-highlight {
    will-change: scroll-position;
}

/* Reduce animations on slow connections */
.slow-connection * {
    animation-duration: 0.1s !important;
    transition-duration: 0.1s !important;
}

.slow-connection .loading-spinner {
    animation: none;
    border: 4px solid #2d8a3e;
}

/* Low memory optimizations */
.low-memory .hero-image::before,
.low-memory .hero-image::after {
    display: none;
}

.low-memory .loading-progress-bar::after {
    display: none;
}

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

.mobile-device .hero-title {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
}

.mobile-device .loading-spinner {
    width: 40px;
    height: 40px;
}

.mobile-device .loading-logo {
    width: 60px;
    height: 60px;
}

/* Touch optimizations */
@media (hover: none) and (pointer: coarse) {
    .nav-link:hover::before {
        display: none;
    }
    
    .btn {
        min-height: 44px; /* Apple's recommended touch target */
    }
}

/* ========================================
   ACCESSIBILITY OPTIMIZATIONS
======================================== */

/* Reduced motion support */
@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;
    }
    
    .loading-spinner {
        animation: none;
        border: 4px solid #2d8a3e;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    .loading-overlay {
        background: #000;
        color: #fff;
    }
    
    .loading-progress {
        border: 2px solid #fff;
    }
    
    .loading-progress-bar {
        background: #fff;
    }
}

/* Keyboard navigation */
.keyboard-nav .nav-link:focus,
.keyboard-nav .btn:focus {
    outline: 3px solid #2d8a3e;
    outline-offset: 2px;
}

/* Focus management */
.skip-link {
    position: absolute;
    left: -9999px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

.skip-link:focus {
    position: fixed;
    top: 10px;
    left: 10px;
    width: auto;
    height: auto;
    padding: 10px 15px;
    background: #2d8a3e;
    color: white;
    text-decoration: none;
    border-radius: 4px;
    z-index: 10000;
}

/* ========================================
   COMPONENT LOADING STATES
======================================== */

[data-lazy-component] {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.5s ease;
}

[data-lazy-component].component-loaded {
    opacity: 1;
    transform: translateY(0);
}

/* Skeleton loading for cards */
.overview-card.loading {
    background: linear-gradient(
        90deg,
        #f0f0f0 25%,
        #e0e0e0 50%,
        #f0f0f0 75%
    );
    background-size: 200% 100%;
    animation: skeleton 1.5s infinite;
}

@keyframes skeleton {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ========================================
   PRINT OPTIMIZATIONS
======================================== */

@media print {
    .loading-overlay,
    .navbar,
    .chatbot-widget,
    .chatbot-toggle {
        display: none !important;
    }
    
    .main-content {
        opacity: 1 !important;
    }
    
    * {
        animation: none !important;
        transition: none !important;
    }
}

/* ========================================
   DARK MODE OPTIMIZATIONS
======================================== */

@media (prefers-color-scheme: dark) {
    .loading-overlay {
        background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    }
    
    .loading-progress {
        background: rgba(255,255,255,0.1);
    }
    
    img.lazy {
        background: linear-gradient(
            90deg,
            #2a2a2a 25%,
            #3a3a3a 50%,
            #2a2a2a 75%
        );
    }
}

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

.visually-hidden {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

.slide-up {
    animation: slideUp 0.6s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

/* Performance monitoring */
.perf-monitor {
    position: fixed;
    top: 10px;
    right: 10px;
    background: rgba(0,0,0,0.8);
    color: white;
    padding: 5px 10px;
    border-radius: 4px;
    font-size: 12px;
    z-index: 9999;
    display: none;
}

.perf-monitor.show {
    display: block;
}