/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-green: #10b981;
    --primary-green-dark: #059669;
    --secondary-green: #34d399;
    --accent-blue: #3b82f6;
    --accent-purple: #8b5cf6;
    --gradient-primary: linear-gradient(135deg, #10b981 0%, #059669 100%);
    --gradient-secondary: linear-gradient(135deg, #34d399 0%, #10b981 100%);
    --gradient-background: linear-gradient(135deg, #f0fdf4 0%, #ecfdf5 50%, #f0f9ff 100%);
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --surface-white: #ffffff;
    --surface-gray: #f9fafb;
    --border-light: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --border-radius: 16px;
    --border-radius-lg: 24px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--gradient-background);
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.6;
    font-feature-settings: 'kern' 1, 'liga' 1, 'calt' 1;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header with enhanced design */
header {
    text-align: center;
    padding: 4rem 0 3rem;
    position: relative;
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: var(--gradient-primary);
    opacity: 0.03;
    border-radius: 50%;
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(180deg); }
}

.header-content {
    position: relative;
    z-index: 1;
}

.header-content h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    margin-bottom: 1rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
    position: relative;
}

.header-content h1 i {
    color: var(--primary-green);
    margin-right: 1rem;
    filter: drop-shadow(0 4px 8px rgba(16, 185, 129, 0.3));
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.header-content p {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--text-secondary);
    font-weight: 400;
    max-width: 600px;
    margin: 0 auto;
}

/* Enhanced main content */
main {
    background: var(--surface-white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    margin-bottom: 4rem;
    overflow: hidden;
    position: relative;
}

main::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
}

/* Search section with modern styling */
.search-section {
    padding: 3rem 2rem;
    background: linear-gradient(135deg, #fafafa 0%, #ffffff 100%);
    border-bottom: 1px solid var(--border-light);
}

.search-container {
    position: relative;
    max-width: 600px;
    margin: 0 auto 2rem;
}

.search-input {
    width: 100%;
    padding: 1rem 1.5rem 1rem 4rem;
    border: 2px solid var(--border-light);
    border-radius: var(--border-radius);
    font-size: 1.1rem;
    font-weight: 400;
    background: var(--surface-white);
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-green);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
    transform: translateY(-1px);
}

.search-input::placeholder {
    color: var(--text-light);
    font-weight: 400;
}

.search-btn {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-light);
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition);
    padding: 0.5rem;
    border-radius: 8px;
}

.search-btn:hover {
    color: var(--primary-green);
    background: rgba(16, 185, 129, 0.1);
}

/* Enhanced filters */
.filters {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.filter-select {
    padding: 0.75rem 1.25rem;
    border: 2px solid var(--border-light);
    border-radius: var(--border-radius);
    background: var(--surface-white);
    color: var(--text-primary);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
    min-width: 180px;
}

.filter-select:focus {
    outline: none;
    border-color: var(--primary-green);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

.filter-select:hover {
    border-color: var(--primary-green);
    transform: translateY(-1px);
}

/* Modern stats section */
.stats-section {
    padding: 3rem 2rem;
    background: var(--surface-white);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.stat-card {
    background: linear-gradient(135deg, var(--surface-white) 0%, var(--surface-gray) 100%);
    padding: 2rem;
    border-radius: var(--border-radius);
    text-align: center;
    border: 1px solid var(--border-light);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-secondary);
    transform: scaleX(0);
    transition: var(--transition);
}

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

.stat-card:hover::before {
    transform: scaleX(1);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary-green);
    margin-bottom: 0.5rem;
    line-height: 1;
    letter-spacing: -0.02em;
}

.stat-label {
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Enhanced food grid */
.results-section {
    padding: 3rem 2rem;
    background: var(--surface-white);
}

.food-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

.food-item {
    background: var(--surface-white);
    border: 1px solid var(--border-light);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.food-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: var(--transition);
}

.food-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-green);
}

.food-item:hover::before {
    transform: scaleX(1);
}

.food-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    line-height: 1.3;
}

.food-category {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: rgba(16, 185, 129, 0.1);
    color: var(--primary-green);
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    text-transform: capitalize;
    margin-bottom: 1rem;
}

.carbon-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-light);
}

.carbon-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.carbon-unit {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.impact-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    margin-left: 0.5rem;
}

.impact-low { background-color: #10b981; }
.impact-medium { background-color: #f59e0b; }
.impact-high { background-color: #ef4444; }

/* Enhanced modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    animation: fadeIn 0.3s ease-out;
}

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

.modal-content {
    background-color: var(--surface-white);
    margin: 5% auto;
    padding: 0;
    border-radius: var(--border-radius-lg);
    width: 90%;
    max-width: 800px;
    max-height: 80vh;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from { transform: translateY(-50px) scale(0.95); opacity: 0; }
    to { transform: translateY(0) scale(1); opacity: 1; }
}

.modal-header {
    padding: 2rem;
    background: var(--gradient-primary);
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0;
}

.close-btn {
    background: none;
    border: none;
    color: white;
    font-size: 2rem;
    cursor: pointer;
    padding: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: var(--transition);
}

.close-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.1);
}

.modal-body {
    padding: 2rem;
}

/* Enhanced footer */
footer {
    text-align: center;
    padding: 3rem 2rem;
    color: var(--text-secondary);
    background: var(--surface-white);
    border-radius: var(--border-radius-lg);
    margin-top: 2rem;
    box-shadow: var(--shadow-md);
}

footer p {
    margin-bottom: 0.75rem;
    font-size: 0.95rem;
    line-height: 1.6;
}

footer p:last-child {
    margin-bottom: 0;
    font-style: italic;
    color: var(--text-light);
}

/* Loading animation */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 3rem;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-light);
    border-top: 3px solid var(--primary-green);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }
    
    header {
        padding: 2rem 0;
    }
    
    .search-section,
    .stats-section,
    .results-section {
        padding: 2rem 1rem;
    }
    
    .filters {
        flex-direction: column;
        align-items: center;
    }
    
    .filter-select {
        width: 100%;
        max-width: 300px;
    }
    
    .food-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .modal-content {
        width: 95%;
        margin: 10% auto;
    }
    
    .modal-header,
    .modal-body {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .header-content h1 {
        font-size: 2rem;
    }
    
    .search-input {
        font-size: 1rem;
        padding: 0.875rem 1.25rem 0.875rem 3.5rem;
    }
    
    .stat-card {
        padding: 1.5rem;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .food-item {
        padding: 1.25rem;
    }
}

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

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-light: #000000;
        --text-secondary: #000000;
        --text-light: #333333;
    }
}

/* Focus styles for better accessibility */
*:focus {
    outline: 2px solid var(--primary-green);
    outline-offset: 2px;
}

button:focus,
select:focus,
input:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.3);
}