/**
 * Simple Storefront CSS - Clean & Minimal
 * Tối ưu hóa performance với CSS variables và utility classes
 */

:root {
    /* Color Palette - Tone đỏ-trắng */
    --primary: #dc2626;
    --primary-light: #ef4444;
    --primary-dark: #b91c1c;
    --secondary: #1f2937;
    --gray-25: #fafafa;
    --red-25: #fef7f7;
    
    /* Spacing Scale */
    --section-padding: clamp(2rem, 5vw, 4rem);
    --container-padding: clamp(1rem, 3vw, 2rem);
    
    /* Animation Timing */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Base Styles */
.storefront-section {
    position: relative;
    padding: var(--section-padding) 0;
    transition: var(--transition-normal);
}

/* Global CTA Section */
.global-cta-section {
    position: relative;
    overflow: hidden;
}

.global-cta-section .bg-pattern {
    background-image:
        radial-gradient(circle at 25% 25%, rgba(255,255,255,0.1) 2px, transparent 2px),
        radial-gradient(circle at 75% 75%, rgba(255,255,255,0.1) 2px, transparent 2px);
    background-size: 50px 50px;
    background-position: 0 0, 25px 25px;
}

.page-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* Typography */
.heading {
    font-family: 'Montserrat', system-ui, sans-serif;
    font-weight: 700;
    line-height: 1.2;
}

/* Animations - Performance Optimized */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fade-in-optimized {
    animation: fadeInUp 0.6s ease-out forwards;
    will-change: opacity, transform;
}

.animate-fade-in-optimized.animate-visible {
    will-change: auto;
}

/* Card Components */
.card-simple {
    background: white;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    transition: var(--transition-normal);
    overflow: hidden;
}

.card-simple:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

/* Image Utilities */
.img-fallback {
    background: linear-gradient(135deg, var(--red-25) 0%, #fee2e2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-light);
}

.img-lazy {
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.img-lazy.loaded {
    opacity: 1;
}

/* Button Styles */
.btn-primary-simple {
    background: var(--primary);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    transition: var(--transition-fast);
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary-simple:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.btn-secondary-simple {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    transition: var(--transition-fast);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-secondary-simple:hover {
    background: var(--primary);
    color: white;
}

/* Grid Utilities */
.grid-responsive {
    display: grid;
    gap: 1.5rem;
    grid-template-columns: 1fr;
}

@media (min-width: 640px) {
    .grid-responsive {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .grid-responsive {
        grid-template-columns: repeat(3, 1fr);
    }
}

.grid-responsive-4 {
    display: grid;
    gap: 1.5rem;
    grid-template-columns: 1fr;
}

@media (min-width: 640px) {
    .grid-responsive-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .grid-responsive-4 {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* Text Utilities */
.text-clamp-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.text-clamp-3 {
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Loading States */
.skeleton-simple {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

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

/* Responsive Utilities */
@media (max-width: 768px) {
    .storefront-section {
        padding: 1.5rem 0;
    }
    
    .heading {
        font-size: clamp(1.5rem, 4vw, 2rem);
    }
}

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

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

/* Focus States for Accessibility */
.btn-primary-simple:focus,
.btn-secondary-simple:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    .storefront-section {
        break-inside: avoid;
    }
    
    .card-simple {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}