/* CSS Reset and Base Styles */
:root {
    /* Light mode colors */
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary: #7c3aed;
    --background: #ffffff;
    --surface: #f9fafb;
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --text-tertiary: #9ca3af;
    --border: #e5e7eb;
    --card-bg: #ffffff;
    --hover-bg: #f3f4f6;
    --shadow: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 25px -5px rgba(0,0,0,0.1);
    --gradient-start: #2563eb;
    --gradient-end: #7c3aed;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: ui-monospace, 'SF Mono', monospace;
    
    /* Transitions */
    --transition: 0.2s ease;
}

/* Dark mode colors - defined in dark-mode.css but base variables here */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    color: var(--text-primary);
    background-color: var(--background);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary);
    color: white;
    padding: var(--space-sm) var(--space-md);
    text-decoration: none;
    z-index: 100;
}

.skip-link:focus {
    top: 0;
}

/* Container */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
}

.gradient-text {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

/* Navbar */
.navbar {
    position: sticky;
    top: 0;
    background: var(--background);
    border-bottom: 1px solid var(--border);
    z-index: 50;
    backdrop-filter: blur(8px);
    background: rgba(255, 255, 255, 0.8);
}

.dark-mode .navbar {
    background: rgba(17, 24, 39, 0.8);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: var(--space-md) var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    text-decoration: none;
    color: var(--text-primary);
}

.logo-dev {
    color: var(--primary);
}

.logo-tools {
    color: var(--text-primary);
}

.logo-site {
    color: var(--text-secondary);
}

.nav-links {
    display: flex;
    gap: var(--space-xl);
}

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

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

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

.theme-toggle {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--space-sm);
    border-radius: 8px;
    transition: all var(--transition);
}

.theme-toggle:hover {
    background: var(--hover-bg);
    color: var(--primary);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-sm);
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
}

/* Hero Section */
.hero {
    padding: var(--space-2xl) 0;
    background: linear-gradient(to bottom, var(--surface), var(--background));
}

.hero-container {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    padding: 0 var(--space-lg);
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    margin-bottom: var(--space-lg);
}

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

/* Search */
.search-container {
    position: relative;
    max-width: 600px;
    margin: 0 auto;
}

.search-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.search-icon {
    position: absolute;
    left: var(--space-md);
    color: var(--text-tertiary);
}

.search-input {
    width: 100%;
    padding: var(--space-md) var(--space-md) var(--space-md) 3rem;
    border: 2px solid var(--border);
    border-radius: 12px;
    font-size: 1rem;
    background: var(--background);
    color: var(--text-primary);
    transition: all var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.search-shortcut {
    position: absolute;
    right: var(--space-md);
    padding: var(--space-xs) var(--space-sm);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

.search-results {
    position: absolute;
    top: calc(100% + var(--space-sm));
    left: 0;
    right: 0;
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    max-height: 400px;
    overflow-y: auto;
    z-index: 10;
    display: none;
}

.search-results.active {
    display: block;
}

/* Categories Section */
.categories {
    padding: var(--space-2xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.section-header h2 {
    font-size: 2rem;
    margin-bottom: var(--space-sm);
}

.section-header p {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-lg);
}

.category-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: var(--space-xl);
    text-align: center;
    transition: all var(--transition);
    cursor: pointer;
}

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

.category-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--surface);
    border-radius: 16px;
    color: var(--primary);
}

.category-card h3 {
    margin-bottom: var(--space-sm);
}

.category-card p {
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
}

.tool-count {
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

/* Tools Section */
.tools {
    padding: var(--space-2xl) 0;
    background: var(--surface);
}

.category-tabs {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
    flex-wrap: wrap;
}

.tab-btn {
    padding: var(--space-sm) var(--space-lg);
    border: 1px solid var(--border);
    background: var(--background);
    color: var(--text-secondary);
    border-radius: 30px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
}

.tab-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.tab-btn.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--space-lg);
}

.tool-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: var(--space-lg);
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.tool-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.tool-icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    background: var(--surface);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
}

.tool-info {
    flex: 1;
}

.tool-info h3 {
    font-size: 1.125rem;
    margin-bottom: var(--space-xs);
}

.tool-info p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: var(--space-sm);
}

.tool-meta {
    display: flex;
    gap: var(--space-xs);
}

.badge {
    background: var(--surface);
    padding: var(--space-xs) var(--space-sm);
    border-radius: 20px;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.tool-link {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.875rem;
    opacity: 0;
    transform: translateX(-10px);
    transition: all var(--transition);
}

.tool-card:hover .tool-link {
    opacity: 1;
    transform: translateX(0);
}

.tool-link.disabled {
    color: var(--text-tertiary);
    pointer-events: none;
}

/* Footer */
.footer {
    background: var(--surface);
    border-top: 1px solid var(--border);
    padding: var(--space-2xl) 0 var(--space-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: var(--space-2xl);
    margin-bottom: var(--space-2xl);
}

.footer-brand p {
    color: var(--text-secondary);
    margin-top: var(--space-md);
    max-width: 300px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
}

.footer-column h4 {
    margin-bottom: var(--space-lg);
    font-size: 1rem;
}

.footer-column ul {
    list-style: none;
}

.footer-column li {
    margin-bottom: var(--space-sm);
}

.footer-column a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition);
    font-size: 0.875rem;
}

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

.footer-bottom {
    padding-top: var(--space-xl);
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

.social-links {
    display: flex;
    gap: var(--space-md);
}

.social-links a {
    color: var(--text-tertiary);
    transition: color var(--transition);
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
    }
    
    .category-tabs {
        overflow-x: auto;
        padding-bottom: var(--space-sm);
        justify-content: flex-start;
    }
    
    .tab-btn {
        white-space: nowrap;
    }
}

@media (max-width: 480px) {
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.category-card, .tool-card {
    animation: fadeIn 0.5s ease forwards;
}

/* Loading States */
.skeleton {
    background: linear-gradient(
        90deg,
        var(--surface) 25%,
        var(--border) 50%,
        var(--surface) 75%
    );
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

/* Tool Pages Common Styles */
.tool-container {
    max-width: 1200px;
    margin: var(--space-2xl) auto;
    padding: 0 var(--space-lg);
}

.tool-header {
    margin-bottom: var(--space-2xl);
    text-align: center;
}

.tool-header h1 {
    font-size: 2.5rem;
    margin-bottom: var(--space-sm);
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.tool-header p {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

.tool-interface {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: var(--space-xl);
    box-shadow: var(--shadow-lg);
}

.tool-actions {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
    flex-wrap: wrap;
}

.btn {
    padding: var(--space-sm) var(--space-lg);
    border: 1px solid var(--border);
    background: var(--background);
    color: var(--text-secondary);
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
}

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

.btn-primary {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.btn-primary:hover {
    background: var(--primary-dark);
    color: white;
}

.input-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
    margin-top: var(--space-lg);
}

.input-area, .output-area {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.input-area label, .output-area label {
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.input-area textarea, .output-area textarea {
    width: 100%;
    min-height: 300px;
    padding: var(--space-md);
    border: 1px solid var(--border);
    border-radius: 12px;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    background: var(--surface);
    color: var(--text-primary);
    resize: vertical;
    transition: all var(--transition);
}

.input-area textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.output-area textarea {
    background: var(--background);
}

.stats-bar {
    display: flex;
    gap: var(--space-lg);
    padding: var(--space-sm) var(--space-md);
    background: var(--surface);
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.stats-bar span {
    font-weight: 600;
    color: var(--primary);
}