:root {
    /* Color Palette - Food Safety Theme */
    --primary-red: #e74c3c;
    --dark-red: #c0392b;
    --light-red: #fadbd8;
    --success-green: #27ae60;
    --warning-orange: #f39c12;
    --info-blue: #3498db;
    
    /* Background Colors */
    --bg-primary: #fdfefe;
    --bg-secondary: #f8f9fa;
    --bg-card: rgba(255, 255, 255, 0.95);
    --bg-gradient: linear-gradient(135deg, #fdfefe 0%, #f8f9fa 50%, #ecf0f1 100%);
    
    /* Text Colors */
    --text-primary: #2c3e50;
    --text-secondary: #5d6d7e;
    --text-muted: #85929e;
    --text-light: #ffffff;
    
    /* Shadows & Effects */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);
    --shadow-hover: 0 12px 32px rgba(231, 76, 60, 0.3);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 24px;
    
    /* Typography */
    --font-family: 'Inter', 'Segoe UI', 'Roboto', system-ui, -apple-system, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
}

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

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-gradient);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography Improvements */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

h1 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-md);
}

h2 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-sm);
    color: var(--primary-red);
}

h3 {
    font-size: var(--font-size-xl);
}

p {
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

.lead {
    font-size: var(--font-size-lg);
    font-weight: 400;
    color: var(--text-muted);
}

/* Enhanced Card Design */
.card {
    background: var(--bg-card);
    border: none;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(10px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
    position: relative;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-red), var(--warning-orange), var(--success-green));
    opacity: 0.8;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.card-body {
    padding: var(--spacing-xl);
}

/* Modern Button Styles */
.btn {
    font-weight: 600;
    border-radius: var(--radius-md);
    padding: 12px 24px;
    font-size: var(--font-size-base);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.btn:hover::before {
    left: 100%;
}

.btn-danger {
    background: linear-gradient(135deg, var(--primary-red), var(--dark-red));
    color: var(--text-light);
    box-shadow: var(--shadow-sm);
}

.btn-danger:hover {
    background: linear-gradient(135deg, var(--dark-red), #a93226);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
    color: var(--text-light);
}

.btn-lg {
    padding: 16px 32px;
    font-size: var(--font-size-lg);
    border-radius: var(--radius-md);
}

/* Enhanced Form Styles */
.form-control {
    border: 2px solid #e9ecef;
    border-radius: var(--radius-md);
    padding: 12px 16px;
    font-size: var(--font-size-base);
    transition: all 0.3s ease;
    background-color: var(--bg-primary);
}

.form-control:focus {
    border-color: var(--primary-red);
    box-shadow: 0 0 0 3px rgba(231, 76, 60, 0.1);
    outline: none;
    background-color: var(--bg-primary);
}

.form-control:hover {
    border-color: #ced4da;
}

.form-label {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.input-group-text {
    background-color: var(--bg-secondary);
    border: 2px solid #e9ecef;
    border-right: none;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Enhanced Alert Styles */
.alert {
    border: none;
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    position: relative;
    overflow: hidden;
}

.alert::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
}

.alert-success {
    background: linear-gradient(135deg, #d5f4e6, #f0fff4);
    color: #155724;
    border-left: 4px solid var(--success-green);
}

.alert-success::before {
    background: var(--success-green);
}

.alert-danger {
    background: linear-gradient(135deg, #fdeaea, #fdf2f2);
    color: #721c24;
    border-left: 4px solid var(--primary-red);
}

.alert-danger::before {
    background: var(--primary-red);
}

.alert-info {
    background: linear-gradient(135deg, #e3f2fd, #f3e5f5);
    color: #0c5460;
    border-left: 4px solid var(--info-blue);
}

.alert-info::before {
    background: var(--info-blue);
}

.alert-heading {
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

/* Form Check Enhancements */
.form-check {
    padding-left: 2rem;
}

.form-check-input {
    width: 1.25rem;
    height: 1.25rem;
    margin-left: -2rem;
    border: 2px solid #dee2e6;
    transition: all 0.3s ease;
}

.form-check-input:checked {
    background-color: var(--primary-red);
    border-color: var(--primary-red);
}

.form-check-input:focus {
    box-shadow: 0 0 0 3px rgba(231, 76, 60, 0.1);
}

.form-check-label {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.5;
}

/* Social Icons */
.social-icons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-sm);
}

.social-icons a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--bg-secondary);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
    box-shadow: var(--shadow-sm);
}

.social-icons a:hover {
    transform: translateY(-3px) scale(1.1);
    box-shadow: var(--shadow-md);
}

/* Logo Enhancements */
.logo-container {
    position: relative;
    display: inline-block;
}

.logo-container img {
    transition: all 0.3s ease;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.1));
}

.logo-container:hover img {
    transform: scale(1.05);
}

/* Loading Spinner */
.spinner-border-sm {
    width: 1rem;
    height: 1rem;
}

/* Utility Classes */
.text-danger {
    color: var(--primary-red) !important;
}

.text-muted {
    color: var(--text-muted) !important;
}

.shadow-lg {
    box-shadow: var(--shadow-lg) !important;
}

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --spacing-xl: 2rem;
    }
    
    .card-body {
        padding: var(--spacing-lg);
    }
    
    .display-4 {
        font-size: var(--font-size-2xl);
    }
    
    h1 {
        font-size: var(--font-size-2xl);
    }
    
    h2 {
        font-size: var(--font-size-xl);
    }
    
    .btn-lg {
        padding: 14px 24px;
        font-size: var(--font-size-base);
    }
    
    .social-icons a {
        width: 44px;
        height: 44px;
    }
}

@media (max-width: 576px) {
    .card-body {
        padding: var(--spacing-md);
    }
    
    .container {
        padding-left: var(--spacing-sm);
        padding-right: var(--spacing-sm);
    }
}

/* Dark mode support (respects user preference) */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #1a1a1a;
        --bg-secondary: #2d2d2d;
        --bg-card: rgba(45, 45, 45, 0.95);
        --bg-gradient: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 50%, #3a3a3a 100%);
        --text-primary: #ffffff;
        --text-secondary: #cccccc;
        --text-muted: #999999;
    }
    
    .form-control {
        background-color: var(--bg-secondary);
        border-color: #495057;
        color: var(--text-primary);
    }
    
    .form-control:focus {
        background-color: var(--bg-secondary);
    }
    
    .input-group-text {
        background-color: #495057;
        border-color: #495057;
        color: var(--text-secondary);
    }
}

/* Accessibility Improvements */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus visible for better keyboard navigation */
.btn:focus-visible,
.form-control:focus-visible,
.form-check-input:focus-visible {
    outline: 3px solid var(--primary-red);
    outline-offset: 2px;
}

/* Print styles */
@media print {
    .btn, .social-icons {
        display: none !important;
    }
    
    .card {
        box-shadow: none !important;
        border: 1px solid #ddd !important;
    }
}