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

:root {
    /* Light theme colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --text-primary: #000000;
    --text-secondary: #6c757d;
    --text-muted: #adb5bd;
    --border-color: #dee2e6;
    --shadow-light: rgba(0, 0, 0, 0.1);
    --shadow-medium: rgba(0, 0, 0, 0.15);
    --shadow-heavy: rgba(0, 0, 0, 0.25);
    --accent-color: #000000;
    --accent-hover: #333333;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --error-color: #dc3545;
    
    /* Typography */
    --font-family-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-family-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Border radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Z-index */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal: 1040;
    --z-popover: 1050;
    --z-tooltip: 1060;
}

/* Dark theme colors */
[data-theme="dark"] {
    --bg-primary: #000000;
    --bg-secondary: #111111;
    --bg-tertiary: #222222;
    --text-primary: #ffffff;
    --text-secondary: #adb5bd;
    --text-muted: #6c757d;
    --border-color: #333333;
    --shadow-light: rgba(255, 255, 255, 0.1);
    --shadow-medium: rgba(255, 255, 255, 0.15);
    --shadow-heavy: rgba(255, 255, 255, 0.25);
    --accent-color: #ffffff;
    --accent-hover: #cccccc;
}

/* Base HTML and Body */
html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-primary);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: background-color var(--transition-normal), color var(--transition-normal);
    overflow-x: hidden;
}

/* Top Rated APIs Section */
.top-rated-apis {
    padding: var(--spacing-3xl) 0;
    background: var(--bg-secondary);
}

.top-rated-apis .section-header {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-2xl);
}

.top-rated-apis .section-title {
    font-size: 1.875rem;
    line-height: 1.2;
}

.top-rated-apis .section-description {
    color: var(--text-secondary);
    max-width: 60ch;
}

.top-rated-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--spacing-xl);
}

.top-rated-card {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    padding: var(--spacing-xl);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    box-shadow: 0 8px 20px var(--shadow-light);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
}

.top-rated-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 28px var(--shadow-medium);
    border-color: transparent;
}

.top-rated-card.featured {
    position: relative;
    outline: 2px solid var(--accent-color);
}

.top-rated-card .card-badge {
    position: absolute;
    top: 12px;
    right: 12px;
    padding: 4px 10px;
    font-size: 0.75rem;
    border-radius: 999px;
    background: var(--accent-color);
    color: var(--bg-primary);
}

.top-rated-card .card-icon {
    font-size: 2rem;
}

.top-rated-card .card-title {
    font-size: 1.25rem;
}

.top-rated-card .card-description {
    color: var(--text-secondary);
}

.top-rated-card .card-stats {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border: 1px dashed var(--border-color);
    border-radius: var(--radius-lg);
}

.top-rated-card .stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
}

.top-rated-card .stat-value {
    font-weight: 700;
}

.top-rated-card .stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.top-rated-card .card-features {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.top-rated-card .feature-tag {
    padding: 6px 10px;
    border-radius: 999px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    font-size: 0.85rem;
}

.top-rated-card .card-btn {
    margin-top: auto;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 14px;
    border-radius: var(--radius-md);
    background: var(--accent-color);
    color: var(--bg-primary);
    text-decoration: none;
    transition: background var(--transition-fast), transform var(--transition-fast);
}

.top-rated-card .card-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

/* Responsive: Top Rated Grid */
@media (max-width: 1024px) {
    .top-rated-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 640px) {
    .top-rated-apis {
        padding: var(--spacing-2xl) 0;
    }
    .top-rated-grid {
        grid-template-columns: 1fr;
    }
}

/* Dark mode tweaks for top-rated */
[data-theme="dark"] .top-rated-apis {
    background: var(--bg-secondary);
}
[data-theme="dark"] .top-rated-card {
    box-shadow: 0 8px 20px var(--shadow-light);
}
[data-theme="dark"] .top-rated-card .feature-tag {
    background: var(--bg-tertiary);
}

/* Skip Link for Accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--accent-color);
    color: var(--bg-primary);
    padding: 8px;
    text-decoration: none;
    border-radius: var(--radius-sm);
    z-index: var(--z-tooltip);
    transition: top var(--transition-fast);
}

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

/* Container */
.container {
    width: 100%;
    padding: 0 var(--spacing-md);
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--spacing-lg);
    }
}

@media (min-width: 1200px) {
    .container {
        padding: 0 var(--spacing-xl);
    }
}

/* Header */
.header {
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    transition: all var(--transition-normal);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    width: 100%;
}

@media (min-width: 768px) {
    .nav-container {
        padding: var(--spacing-md) var(--spacing-lg);
    }
}

@media (min-width: 1200px) {
    .nav-container {
        padding: var(--spacing-md) var(--spacing-xl);
    }
}

.nav-brand .logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 700;
    font-size: 1.25rem;
    gap: var(--spacing-sm);
}

.logo svg {
    color: var(--accent-color);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-links {
    display: none;
    list-style: none;
    gap: var(--spacing-lg);
}

@media (min-width: 768px) {
    .nav-links {
        display: flex;
    }
}

/* Mobile menu open state */
.nav-links.mobile-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-md);
    box-shadow: 0 4px 6px var(--shadow-light);
    z-index: var(--z-dropdown);
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link:hover {
    color: var(--text-primary);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-color);
    transition: width var(--transition-fast);
}

.nav-link:hover::after {
    width: 100%;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* Auth Buttons */
.auth-buttons {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.auth-buttons .btn {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.auth-buttons .btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.auth-buttons .btn-secondary:hover {
    background: var(--bg-secondary);
    border-color: var(--text-primary);
}

.auth-buttons .btn-primary {
    background: var(--accent-color);
    color: white;
    border: 1px solid var(--accent-color);
}

.auth-buttons .btn-primary:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
}

/* User Menu */
.user-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    position: relative;
}

.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
}

.user-info:hover {
    background: var(--bg-secondary);
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--accent-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
}

.user-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 12px var(--shadow-medium);
    min-width: 150px;
    padding: 0.5rem 0;
    z-index: 1000;
    display: none;
}

.user-dropdown.show {
    display: block;
}

.user-dropdown a {
    display: block;
    padding: 0.5rem 1rem;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: background-color var(--transition-fast);
}

.user-dropdown a:hover {
    background: var(--bg-secondary);
}

/* Theme Toggle */
.theme-toggle {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm);
    cursor: pointer;
    color: var(--text-primary);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
}

.theme-toggle:hover {
    background-color: var(--bg-secondary);
    border-color: var(--accent-color);
}

.theme-icon {
    transition: opacity var(--transition-fast);
}

[data-theme="light"] .moon-icon,
[data-theme="dark"] .sun-icon {
    display: none;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: flex;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
    gap: 4px;
}

@media (min-width: 768px) {
    .mobile-menu-toggle {
        display: none;
    }
}

.hamburger-line {
    width: 20px;
    height: 2px;
    background-color: var(--text-primary);
    transition: all var(--transition-fast);
}

/* Hero Section */
.hero {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    text-align: center;
}

.hero-content {
    width: 100%;
    text-align: center;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.highlight {
    background: linear-gradient(135deg, var(--accent-color), var(--text-secondary));
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    position: relative;
}

.hero-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2xl);
}

/* Search Form */
.hero-search {
    margin-bottom: var(--spacing-2xl);
}

.search-form {
    display: flex;
    gap: var(--spacing-sm);
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    flex-direction: column;
}

@media (min-width: 640px) {
    .search-form {
        flex-direction: row;
    }
}

.search-input-wrapper {
    position: relative;
    flex: 1;
}

.search-icon {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
}

.search-input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) 3rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.search-input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px var(--shadow-light);
}

.search-btn {
    padding: var(--spacing-md) var(--spacing-xl);
    background-color: var(--accent-color);
    color: var(--bg-primary);
    border: none;
    border-radius: var(--radius-lg);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.search-btn:hover {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
}

/* Hero Stats */
.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
    max-width: 600px;
    margin: 0 auto;
}

.stat {
    text-align: center;
    padding: var(--spacing-xs);
}

.stat-number {
    display: block;
    font-size: clamp(1.25rem, 4vw, 2rem);
    font-weight: 800;
    color: var(--accent-color);
    line-height: 1;
}

.stat-label {
    font-size: clamp(0.625rem, 2.5vw, 0.875rem);
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
    line-height: 1.2;
}

/* Mobile optimization for stats */
@media (max-width: 480px) {
    .hero-stats {
        gap: var(--spacing-xs);
        max-width: 100%;
    }
    
    .stat {
        padding: var(--spacing-xs) 0;
    }
    
    .stat-number {
        font-size: clamp(1rem, 5vw, 1.5rem);
    }
    
    .stat-label {
        font-size: clamp(0.5rem, 3vw, 0.75rem);
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }
}

@media (max-width: 320px) {
    .stat-label {
        font-size: 0.5rem;
        line-height: 1.1;
    }
    
    .stat-number {
        font-size: 0.9rem;
    }
}

/* Section Styles */
.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-xl);
    color: var(--text-primary);
}

.section-description {
    text-align: center;
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2xl);
}

/* Featured APIs */
.featured-apis {
    padding: var(--spacing-3xl) 0;
    background-color: var(--bg-secondary);
}

/* Categories */
.categories {
    padding: var(--spacing-3xl) 0;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.category-card {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    text-align: center;
    transition: all var(--transition-normal);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, var(--shadow-light), transparent);
    transition: left var(--transition-slow);
}

.category-card:hover::before {
    left: 100%;
}

.category-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 30px var(--shadow-medium);
    border-color: var(--accent-color);
}

.category-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.category-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.category-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.category-count {
    display: inline-block;
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
}

/* All APIs Section */
.all-apis {
    padding: var(--spacing-3xl) 0;
    background-color: var(--bg-secondary);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    flex-direction: column;
    gap: var(--spacing-lg);
}

@media (min-width: 768px) {
    .section-header {
        flex-direction: row;
        gap: 0;
    }
}

.filter-controls {
    display: flex;
    gap: var(--spacing-md);
    flex-direction: column;
}

@media (min-width: 640px) {
    .filter-controls {
        flex-direction: row;
    }
}

.filter-select,
.sort-select {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-select:focus,
.sort-select:focus {
    outline: none;
    border-color: var(--accent-color);
}

/* API Grid */
.api-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.api-card {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.api-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--shadow-medium);
    border-color: var(--accent-color);
}

.api-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
}

.api-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.api-category {
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.api-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.5;
}

.api-features {
    list-style: none;
    margin-bottom: var(--spacing-md);
}

.api-features li {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-xs);
    position: relative;
    padding-left: var(--spacing-md);
}

.api-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
}

.api-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.api-price {
    font-weight: 600;
    color: var(--text-primary);
}

.api-btn {
    background-color: var(--accent-color);
    color: var(--bg-primary);
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    display: inline-block;
}

.api-btn:hover {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
}

/* Load More Button */
.load-more-container {
    text-align: center;
}

.load-more-btn {
    background-color: transparent;
    color: var(--accent-color);
    border: 2px solid var(--accent-color);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-lg);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.load-more-btn:hover {
    background-color: var(--accent-color);
    color: var(--bg-primary);
}

/* Pricing Section */
.pricing {
    padding: var(--spacing-3xl) 0;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    justify-items: stretch;
}

@media (max-width: 768px) {
    .pricing-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .pricing-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-xs);
    }
}

.pricing-card {
    background-color: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    position: relative;
    transition: all var(--transition-normal);
    width: 100%;
    min-height: 340px;
    display: flex;
    flex-direction: column;
    transform: scale(0.95);
}

@media (max-width: 768px) {
    .pricing-card {
        padding: var(--spacing-md);
        min-height: 300px;
        transform: scale(0.92);
    }
}

@media (max-width: 480px) {
    .pricing-card {
        padding: var(--spacing-sm);
        min-height: 280px;
        transform: scale(0.9);
    }
}

.pricing-card.featured {
    border-color: var(--accent-color);
    transform: scale(1.08);
    box-shadow: 0 8px 25px var(--shadow-medium);
    z-index: 2;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    min-height: 380px;
    padding: var(--spacing-xl);
}

@media (max-width: 768px) {
    .pricing-card.featured {
        transform: scale(1.05);
        min-height: 340px;
        padding: var(--spacing-lg);
        box-shadow: 0 6px 20px var(--shadow-medium);
    }
}

@media (max-width: 480px) {
    .pricing-card.featured {
        transform: scale(1.02);
        min-height: 320px;
        padding: var(--spacing-md);
        box-shadow: 0 4px 15px var(--shadow-medium);
    }
}

.pricing-card:hover {
    transform: scale(0.95) translateY(-4px);
    box-shadow: 0 8px 20px var(--shadow-medium);
}

.pricing-card.featured:hover {
    transform: scale(1.08) translateY(-6px);
    box-shadow: 0 12px 30px var(--shadow-heavy);
}

@media (max-width: 768px) {
    .pricing-card:hover {
        transform: scale(0.92) translateY(-3px);
    }
    
    .pricing-card.featured:hover {
        transform: scale(1.05) translateY(-4px);
    }
}

@media (max-width: 480px) {
    .pricing-card:hover {
        transform: scale(0.9) translateY(-2px);
    }
    
    .pricing-card.featured:hover {
        transform: scale(1.02) translateY(-3px);
    }
}


.pricing-badge {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-hover) 100%);
    color: var(--bg-primary);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 700;
    box-shadow: 0 4px 12px var(--shadow-medium);
    z-index: 3;
}

.pricing-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.pricing-card.featured .pricing-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
}

.pricing-price {
    margin-bottom: var(--spacing-lg);
}

.pricing-card.featured .pricing-price {
    margin-bottom: var(--spacing-xl);
}

.price-amount {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--accent-color);
    line-height: 1;
}

.pricing-card.featured .price-amount {
    font-size: 2.8rem;
}

.price-unit {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-left: var(--spacing-xs);
}

.pricing-features {
    list-style: none;
    margin-bottom: var(--spacing-xl);
    text-align: left;
    flex-grow: 1;
}

.pricing-features li {
    padding: var(--spacing-sm) 0;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.pricing-btn {
    display: inline-block;
    width: 100%;
    background-color: var(--accent-color);
    color: var(--bg-primary);
    border: none;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    text-align: center;
}

.pricing-card.featured .pricing-btn {
    background-color: var(--accent-color);
}

.pricing-btn:hover {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
}

/* Footer */
.footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-3xl) 0 var(--spacing-xl) 0;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.footer-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

.footer-heading {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--text-primary);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--border-color);
    flex-direction: column;
    gap: var(--spacing-md);
}

@media (min-width: 640px) {
    .footer-bottom {
        flex-direction: row;
        gap: 0;
    }
}

.footer-copyright {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.footer-social {
    display: flex;
    gap: var(--spacing-md);
}

.social-link {
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.social-link:hover {
    color: var(--text-primary);
}

/* Loading Spinner */
.loading-spinner {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: var(--z-modal);
}

.loading-spinner.show {
    display: flex;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Utility Classes */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.text-center {
    text-align: center;
}

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

/* Responsive Design */
@media (max-width: 767px) {
    .hero {
        padding: var(--spacing-2xl) 0;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .api-grid {
        grid-template-columns: 1fr;
    }
    
    .category-grid {
        grid-template-columns: 1fr;
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
    }
    
    .pricing-card.featured {
        transform: none;
    }
    
    .pricing-card.featured:hover {
        transform: translateY(-4px);
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --shadow-light: rgba(0, 0, 0, 0.3);
        --shadow-medium: rgba(0, 0, 0, 0.4);
        --shadow-heavy: rgba(0, 0, 0, 0.5);
    }
    
    [data-theme="dark"] {
        --border-color: #ffffff;
        --shadow-light: rgba(255, 255, 255, 0.3);
        --shadow-medium: rgba(255, 255, 255, 0.4);
        --shadow-heavy: rgba(255, 255, 255, 0.5);
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .skip-link:focus {
        transition: none;
    }
}

/* Payment Styles */
.payment-section {
    padding: var(--spacing-3xl) 0;
    min-height: 80vh;
}

.payment-container {
    max-width: 1000px;
    margin: 0 auto;
}

.payment-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.payment-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.payment-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
}

.payment-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: start;
}

/* Mobile Menu */
.mobile-menu {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
}

.mobile-menu.active {
    display: block;
}

.mobile-menu-content {
    position: absolute;
    top: 0;
    right: 0;
    width: 280px;
    height: 100%;
    background: var(--bg-primary);
    border-left: 1px solid var(--border-color);
    padding: 2rem 1.5rem;
    transform: translateX(100%);
    transition: transform 0.3s ease;
}

.mobile-menu.active .mobile-menu-content {
    transform: translateX(0);
}

.mobile-nav-links {
    list-style: none;
    padding: 0;
    margin: 0 0 2rem 0;
}

.mobile-nav-links li {
    margin-bottom: 1rem;
}

.mobile-nav-link {
    display: block;
    padding: 0.75rem 0;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 500;
    border-bottom: 1px solid var(--border-color);
}

.mobile-nav-link:hover {
    color: var(--primary-color);
}

.mobile-auth-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.mobile-btn {
    width: 100%;
    text-align: center;
    padding: 0.875rem 1.5rem;
}

.mobile-user-menu {
    border-top: 1px solid var(--border-color);
    padding-top: 1.5rem;
}

.mobile-user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.mobile-user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
}

.mobile-logout {
    display: block;
    padding: 0.75rem 0;
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
}

.mobile-logout:hover {
    color: var(--primary-color);
}

@media (max-width: 768px) {
    .payment-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }
}

/* Order Summary */
.order-summary {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    border: 1px solid var(--border-color);
}

.summary-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.summary-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
    border: 1px solid var(--border-color);
}

.plan-info h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.plan-info p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.plan-price {
    text-align: right;
}

.price-amount {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-color);
}

.price-unit {
    font-size: 0.875rem;
    color: var(--text-secondary);
    display: block;
}

.credit-selection {
    margin-bottom: var(--spacing-lg);
}

.credit-label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.credit-select {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1rem;
}

.credit-select optgroup {
    font-weight: 600;
    color: var(--accent-color);
    background-color: var(--bg-secondary);
    padding: var(--spacing-xs);
}

.credit-select option {
    padding: var(--spacing-sm);
    color: var(--text-primary);
    background-color: var(--bg-primary);
}

.summary-total {
    border-top: 1px solid var(--border-color);
    padding-top: var(--spacing-lg);
}

.total-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.total-label {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

.total-amount {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-color);
}

/* Payment Form */
.payment-form-container {
    background-color: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    border: 1px solid var(--border-color);
}

.form-section {
    margin-bottom: var(--spacing-2xl);
}

.form-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.form-row {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.form-row:last-child {
    margin-bottom: 0;
}

.form-group {
    flex: 1;
}

.form-group.half-width {
    flex: 0 0 calc(50% - var(--spacing-sm));
}

.form-label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.form-input,
.form-select {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--accent-color);
}

.stripe-element {
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-primary);
    transition: border-color var(--transition-fast);
}

.stripe-element:focus-within {
    border-color: var(--accent-color);
}

.error-message {
    color: var(--error-color);
    font-size: 0.875rem;
    margin-top: var(--spacing-xs);
    min-height: 1.2em;
}

.form-actions {
    margin-top: var(--spacing-2xl);
}

.payment-btn {
    width: 100%;
    padding: var(--spacing-lg) var(--spacing-xl);
    background-color: var(--accent-color);
    color: var(--bg-primary);
    border: none;
    border-radius: var(--radius-lg);
    font-size: 1.125rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.payment-btn:hover:not(:disabled) {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
}

.payment-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.spinner.hidden {
    display: none;
}

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

.payment-security {
    margin-top: var(--spacing-xl);
    text-align: center;
}

.security-badges {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.security-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.security-text {
    font-size: 0.75rem;
    color: var(--text-muted);
}

@media (max-width: 640px) {
    .form-row {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .form-group.half-width {
        flex: 1;
    }
    
    .security-badges {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}

/* Print styles */
@media print {
    .header,
    .footer,
    .theme-toggle,
    .mobile-menu-toggle,
    .search-form,
    .pricing-btn,
    .api-btn,
    .load-more-btn {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .api-card,
    .category-card,
    .pricing-card {
        border: 1px solid #000;
        box-shadow: none;
    }
}