/* ===================== ENHANCED RESPONSIVE STYLES - RECEIPT MANAGEMENT SYSTEM ===================== */

/* Base Styles & Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #0073e6;
    --primary-dark: #0056b3;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --white: #ffffff;
    --border-color: #dee2e6;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.1);
    --border-radius: 12px;
    --border-radius-sm: 6px;
    --transition: all 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f8f9fa;
}

/* Full Screen Container */
.rs-fullscreen-container {
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    flex-direction: column;
    width: 100%;
    overflow-x: hidden;
}

.rs-main-content {
    flex: 1;
    padding: 0;
    width: 100%;
    max-width: 100vw;
    overflow-x: hidden;
}

/* Navigation Styles - Enhanced for Mobile */
.rs-navigation {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    width: 100%;
}

.rs-nav-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    background: var(--white);
    width: 100%;
}

.rs-nav-header h2 {
    margin: 0;
    font-size: 1.25rem;
    font-weight: bold;
    color: #2c3e50;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.rs-nav-actions {
    display: flex;
    gap: 0.5rem;
}

.rs-logout-btn {
    background: var(--danger-color);
    color: var(--white);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius-sm);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
}

.rs-nav-links {
    display: flex;
    overflow-x: auto;
    padding: 0.5rem;
    gap: 0.25rem;
    -webkit-overflow-scrolling: touch;
    background: var(--white);
    width: 100%;
}

.rs-nav-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 0.5rem;
    color: #666;
    text-decoration: none;
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
    white-space: nowrap;
    flex-shrink: 0;
    border: 1px solid transparent;
    font-size: 0.8rem;
    min-width: auto;
}

.rs-nav-icon {
    font-size: 1.1rem;
}

.rs-nav-text {
    font-weight: 500;
    font-size: 0.8rem;
}

/* Page Container - Full Width Mobile */
.rs-page-container {
    padding: 1rem;
    width: 100%;
    max-width: 100vw;
    margin: 0 auto;
    box-sizing: border-box;
}

/* Card Styles - Full Width */
.rs-card {
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    margin-bottom: 1rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    width: 100%;
}

/* Form Styles - Optimized for Mobile */
.rs-form-group {
    margin-bottom: 1rem;
    width: 100%;
}

.rs-form-group input,
.rs-form-group textarea,
.rs-form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: 1rem;
    transition: var(--transition);
    background: var(--white);
    box-sizing: border-box;
}

.rs-form-row {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    width: 100%;
}

/* Button Styles - Full Width Mobile */
.rs-primary-btn {
    background: var(--primary-color);
    color: var(--white);
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius-sm);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    width: 100%;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.rs-secondary-btn {
    background: var(--secondary-color);
    color: var(--white);
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius-sm);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    width: 100%;
    font-size: 0.9rem;
}

/* POS System - Full Width Mobile */
.rs-pos-system {
    width: 100%;
    height: 100%;
    max-width: 100vw;
}

.rs-pos-container {
    background: var(--white);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    margin: 0;
    width: 100%;
}

.rs-pos-header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--white);
    padding: 1rem;
    text-align: center;
    width: 100%;
}

.rs-pos-layout {
    display: flex;
    flex-direction: column;
    min-height: 500px;
    width: 100%;
}

.rs-pos-section {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    width: 100%;
    box-sizing: border-box;
}

/* Products Grid - Responsive */
.rs-products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 0.75rem;
    max-height: 300px;
    overflow-y: auto;
    padding: 0.5rem;
    width: 100%;
}

.rs-product-card {
    background: var(--white);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 0.75rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 120px;
}

/* Cart Section - Full Width */
.rs-pos-cart {
    padding: 1rem;
    background: var(--white);
    position: relative;
    width: 100%;
}

.rs-cart-list {
    max-height: 250px;
    overflow-y: auto;
    margin-bottom: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 0.5rem;
    width: 100%;
}

/* Dashboard Styles - Mobile Optimized */
#rs-professional-dashboard {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: #f8f9fa;
    min-height: 100vh;
    padding: 0;
    width: 100%;
    max-width: 100vw;
    overflow-x: hidden;
}

.rs-dashboard-header {
    background: var(--white);
    padding: 1rem;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    box-shadow: var(--shadow);
    width: 100%;
}

.rs-header-stats {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.75rem;
    width: 100%;
}

.rs-stat-card {
    background: var(--white);
    border-radius: 10px;
    padding: 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
    width: 100%;
}

.rs-dashboard-content {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    width: 100%;
}

.rs-main-column {
    flex: 2;
    width: 100%;
}

.rs-sidebar {
    flex: 1;
    width: 100%;
}

.rs-widget {
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    border: 1px solid var(--border-color);
    margin-bottom: 1rem;
    transition: var(--transition);
    width: 100%;
}

/* Quick Actions - Mobile Friendly */
.rs-quick-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}

.rs-action-btn {
    background: var(--light-color);
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 0.75rem 0.5rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    color: #333;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
}

/* Modal Styles - Full Width Mobile */
.rs-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 9999;
    align-items: center;
    justify-content: center;
    padding: 0.5rem;
    box-sizing: border-box;
}

.rs-modal-content {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1rem;
    width: 100%;
    max-width: 100%;
    max-height: 95vh;
    overflow: auto;
    position: relative;
    box-shadow: var(--shadow-lg);
    margin: 0.5rem;
}

.rs-modal-actions {
    margin-top: 1rem;
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.5rem;
    width: 100%;
}

/* Products Table - Scrollable on Mobile */
.rs-products-table-container {
    max-height: 600px;
    overflow-y: auto;
    width: 100%;
    overflow-x: auto;
}

.rs-products-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
    min-width: 800px;
}

/* Sales Table - Scrollable on Mobile */
.rs-sales-table-container {
    overflow-x: auto;
    width: 100%;
}

.rs-sales-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
    min-width: 600px;
}

/* Authentication Styles - Full Screen Mobile */
.rs-fullscreen-auth {
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    width: 100%;
}

.rs-auth-container {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 400px;
    margin: 0.5rem;
}

/* Stock Status Indicators */
.rs-in-stock {
    border-color: var(--success-color);
}

.rs-low-stock {
    border-color: var(--warning-color);
    background: #fffbf0;
}

.rs-out-of-stock {
    border-color: var(--danger-color);
    background: #f8f9fa;
    opacity: 0.6;
    cursor: not-allowed;
}

.rs-in-stock .rs-stock-indicator {
    background: var(--success-color);
}

.rs-low-stock .rs-stock-indicator {
    background: var(--warning-color);
    color: #212529;
}

.rs-out-of-stock .rs-stock-indicator {
    background: var(--danger-color);
}

/* Button Colors - Professional */
.rs-btn-primary {
    background: var(--primary-color);
    color: var(--white);
}

.rs-btn-success {
    background: var(--success-color);
    color: var(--white);
}

.rs-btn-warning {
    background: var(--warning-color);
    color: #212529;
}

.rs-btn-danger {
    background: var(--danger-color);
    color: var(--white);
}

.rs-btn-info {
    background: var(--info-color);
    color: var(--white);
}

/* Form Actions - Full Width */
.rs-form-actions {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 1.5rem;
    width: 100%;
}

/* Empty States */
.rs-empty-state,
.rs-empty-cart,
.rs-empty-products {
    text-align: center;
    padding: 2rem 1rem;
    color: #666;
    width: 100%;
}

/* Success/Error Messages */
.rs-success-message {
    background: #d4edda;
    color: #155724;
    padding: 0.75rem;
    border-radius: var(--border-radius-sm);
    margin-bottom: 1rem;
    border: 1px solid #c3e6cb;
    width: 100%;
}

.rs-error-message {
    background: #f8d7da;
    color: #721c24;
    padding: 0.75rem;
    border-radius: var(--border-radius-sm);
    margin-bottom: 1rem;
    border: 1px solid #f5c6cb;
    width: 100%;
}

/* ===================== RESPONSIVE BREAKPOINTS ===================== */

/* Small phones (up to 360px) */
@media (max-width: 360px) {
    .rs-nav-header {
        padding: 0.75rem;
    }
    
    .rs-nav-header h2 {
        font-size: 1.1rem;
    }
    
    .rs-nav-link {
        padding: 0.5rem 0.25rem;
        font-size: 0.75rem;
    }
    
    .rs-nav-icon {
        font-size: 1rem;
    }
    
    .rs-products-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
        gap: 0.5rem;
    }
    
    .rs-product-card {
        padding: 0.5rem;
        min-height: 100px;
    }
    
    .rs-stat-card {
        padding: 0.75rem;
    }
    
    .rs-quick-actions {
        grid-template-columns: 1fr;
    }
}

/* Tablets and larger phones (768px and up) */
@media (min-width: 768px) {
    .rs-page-container {
        padding: 1.5rem;
        max-width: 95%;
    }
    
    .rs-nav-links {
        gap: 0.5rem;
        padding: 1rem;
    }
    
    .rs-nav-link {
        padding: 0.75rem 1rem;
        font-size: 0.9rem;
    }
    
    .rs-form-row {
        flex-direction: row;
        gap: 1rem;
    }
    
    .rs-primary-btn,
    .rs-secondary-btn {
        width: auto;
    }
    
    .rs-pos-layout {
        display: grid;
        grid-template-columns: 2fr 1fr;
    }
    
    .rs-products-grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
        max-height: 500px;
    }
    
    .rs-dashboard-content {
        flex-direction: row;
    }
    
    .rs-header-stats {
        grid-template-columns: 1fr 1fr;
    }
    
    .rs-modal-actions {
        grid-template-columns: 1fr 1fr;
    }
    
    .rs-form-actions {
        flex-direction: row;
    }
    
    .rs-quick-actions {
        grid-template-columns: 1fr 1fr;
    }
}

/* Large tablets and small laptops (1024px and up) */
@media (min-width: 1024px) {
    .rs-nav-links {
        gap: 1rem;
    }
    
    .rs-header-stats {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .rs-modal-actions {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .rs-pos-layout {
        grid-template-columns: 1fr 1fr 1fr;
    }
    
    .rs-quick-actions {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .rs-products-grid {
        grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    }
}

/* Large screens (1200px and up) */
@media (min-width: 1200px) {
    .rs-page-container {
        max-width: 1200px;
    }
    
    .rs-modal-content {
        max-width: 600px;
    }
}

/* ===================== UTILITY CLASSES ===================== */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }

.w-100 { width: 100%; }
.h-100 { height: 100%; }

.d-flex { display: flex; }
.d-block { display: block; }
.d-none { display: none; }

.flex-column { flex-direction: column; }
.flex-row { flex-direction: row; }

.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.align-center { align-items: center; }

/* Print Styles */
@media print {
    .rs-navigation,
    .rs-modal-actions,
    .rs-btn {
        display: none !important;
    }
    
    .rs-main-content {
        margin: 0 !important;
        padding: 0 !important;
    }
    
    .rs-card {
        box-shadow: none !important;
        border: 1px solid #000 !important;
    }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    .rs-card {
        border: 2px solid #000;
    }
    
    .rs-form-group input,
    .rs-form-group textarea,
    .rs-form-group select {
        border: 2px solid #000;
    }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Touch device optimizations */
@media (hover: none) and (pointer: coarse) {
    .rs-btn,
    .rs-nav-link,
    .rs-product-card {
        min-height: 44px;
    }
    
    .rs-qty-btn,
    .rs-cart-btn {
        min-width: 44px;
        min-height: 44px;
    }
    
    .rs-product-controls input {
        min-height: 44px;
    }
}