/* Responsive Design System */

/* Mobile First Approach */
@media (max-width: 479px) {
    /* Extra Small Devices */
    .container {
        padding: 0 var(--spacing-2);
    }
    
    .hero-title {
        font-size: var(--font-size-2xl);
    }
    
    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }
    
    .btn-large {
        width: 100%;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-4);
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .nav-buttons {
        flex-direction: column;
        gap: var(--spacing-1);
    }
    
    .nav-buttons .btn {
        font-size: var(--font-size-xs);
        padding: var(--spacing-1) var(--spacing-2);
    }
}

/* Small Devices (480px - 767px) */
@media (min-width: 480px) and (max-width: 767px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .hero-buttons {
        flex-direction: row;
        justify-content: center;
        flex-wrap: wrap;
    }
}

/* Medium Devices (768px - 1023px) */
@media (min-width: 768px) and (max-width: 1023px) {
    .auth-container {
        flex-direction: row;
    }
    
    .auth-features {
        display: none; /* Hide on tablets */
    }
    
    .dashboard-header {
        padding: 0 var(--spacing-4);
    }
    
    .content-area {
        padding: var(--spacing-4) var(--spacing-6);
    }
    
    .pos-layout {
        flex-direction: row;
    }
    
    .cart-section {
        width: 20rem;
    }
}

/* Large Devices (1024px - 1279px) */
@media (min-width: 1024px) and (max-width: 1279px) {
    .container {
        max-width: 1024px;
    }
    
    .hero-content {
        grid-template-columns: 1.2fr 1fr;
        gap: var(--spacing-12);
    }
    
    .sidebar {
        width: 15rem;
    }
    
    .main-content {
        margin-right: 15rem;
    }
}

/* Extra Large Devices (1280px+) */
@media (min-width: 1280px) {
    .container {
        max-width: 1280px;
    }
    
    .hero-content {
        grid-template-columns: 1.3fr 1fr;
        gap: var(--spacing-16);
    }
    
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-8);
    }
    
    .quick-actions {
        grid-template-columns: repeat(4, 1fr);
        gap: var(--spacing-8);
    }
}

/* Print Styles */
@media print {
    * {
        -webkit-print-color-adjust: exact !important;
        color-adjust: exact !important;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.4;
        color: black;
        background: white;
    }
    
    .no-print {
        display: none !important;
    }
    
    .page-break {
        page-break-before: always;
    }
    
    .navbar,
    .sidebar,
    .dashboard-header,
    .modal,
    .btn {
        display: none !important;
    }
    
    .main-content {
        margin: 0;
        padding: 0;
    }
    
    .content-area {
        padding: 0;
    }
    
    table {
        border-collapse: collapse;
        width: 100%;
    }
    
    th, td {
        border: 1px solid #ddd;
        padding: 8px;
        text-align: right;
    }
    
    th {
        background-color: #f5f5f5;
        font-weight: bold;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --gray-100: #E0E0E0;
        --gray-200: #C0C0C0;
        --gray-300: #A0A0A0;
        --gray-400: #808080;
        --gray-500: #606060;
        --gray-600: #404040;
        --gray-700: #202020;
        --gray-800: #101010;
        --gray-900: #000000;
    }
    
    .btn-outline {
        border-width: 2px;
    }
    
    .nav-item.active {
        border-right-width: 4px;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .loading-spinner {
        animation: none;
        border: 4px solid var(--gray-400);
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --gray-50: #1F2937;
        --gray-100: #374151;
        --gray-200: #4B5563;
        --gray-300: #6B7280;
        --gray-400: #9CA3AF;
        --gray-500: #D1D5DB;
        --gray-600: #E5E7EB;
        --gray-700: #F3F4F6;
        --gray-800: #F9FAFB;
        --gray-900: #FFFFFF;
    }
    
    body {
        background-color: var(--gray-50);
        color: var(--gray-900);
    }
    
    .navbar,
    .sidebar,
    .dashboard-header,
    .modal-content,
    .feature-card,
    .action-card,
    .product-card,
    .cart-section {
        background: var(--gray-100);
        border-color: var(--gray-200);
    }
}

/* Focus Styles for Accessibility */
button:focus,
input:focus,
select:focus,
textarea:focus,
a:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Skip Link for Screen Readers */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--primary-color);
    color: white;
    padding: 8px;
    text-decoration: none;
    border-radius: 4px;
    z-index: 1000;
}

.skip-link:focus {
    top: 6px;
}

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--gray-300);
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* Error States */
.error {
    border-color: var(--danger-color) !important;
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1) !important;
}

.error-message {
    color: var(--danger-color);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-1);
}

/* Success States */
.success {
    border-color: var(--success-color) !important;
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1) !important;
}

.success-message {
    color: var(--success-color);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-1);
}