:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --secondary-color: #06b6d4;
    --background: #ffffff;
    --surface: #f8fafc;
    --surface-hover: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --radius: 0.5rem;
    --transition: all 0.2s ease;
}

[data-theme="dark"] {
    --primary-color: #6366f1;
    --primary-hover: #7c3aed;
    --secondary-color: #22d3ee;
    --background: #0f172a;
    --surface: #1e293b;
    --surface-hover: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border-color: #334155;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    transition: var(--transition);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.header {
    background: var(--surface);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
    flex-wrap: wrap;
    gap: 1rem;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

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

.nav-btn {
    padding: 0.5rem 1rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

.nav-btn:hover {
    background: var(--surface-hover);
    color: var(--text-primary);
}

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

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.search-box {
    display: flex;
    align-items: center;
    background: var(--background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    overflow: hidden;
    min-width: 250px;
}

.search-box input {
    flex: 1;
    padding: 0.5rem 1rem;
    border: none;
    background: transparent;
    outline: none;
    color: var(--text-primary);
}

.search-box input::placeholder {
    color: var(--text-muted);
}

.search-btn {
    padding: 0.5rem;
    border: none;
    background: transparent;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
}

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

.theme-toggle {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    background: var(--background);
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 1.2rem;
    transition: var(--transition);
}

.theme-toggle:hover {
    background: var(--surface-hover);
}

.main {
    padding: 2rem 0;
    min-height: calc(100vh - 200px);
}

.filters {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 2rem;
    gap: 1rem;
    flex-wrap: wrap;
}

.filter-tags {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.filter-label {
    font-weight: 500;
    color: var(--text-secondary);
    white-space: nowrap;
}

.tag-list {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.tag {
    padding: 0.25rem 0.75rem;
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: 9999px;
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-secondary);
}

.tag:hover {
    background: var(--surface-hover);
}

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

.view-options {
    display: flex;
    gap: 0.5rem;
}

.view-btn {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    background: var(--background);
    color: var(--text-secondary);
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
}

.view-btn:hover {
    background: var(--surface-hover);
}

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

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
    animation: fadeIn 0.3s ease;
}

.tools-grid.list-view {
    grid-template-columns: 1fr;
    gap: 1rem;
}

.tool-card {
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.5rem;
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

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

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

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

.tool-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.tool-icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.tool-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.tool-description {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.tool-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.tool-tag {
    padding: 0.25rem 0.5rem;
    background: var(--background);
    border: 1px solid var(--border-color);
    border-radius: 0.25rem;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.tool-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.tool-category {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 500;
}

.tool-favorite {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    transition: var(--transition);
    opacity: 0.7;
}

.tool-favorite:hover {
    opacity: 1;
    transform: scale(1.1);
}

.tool-favorite.active {
    color: #ef4444;
    opacity: 1;
}

.no-results {
    text-align: center;
    padding: 4rem 2rem;
}

.no-results-content h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.no-results-content p {
    color: var(--text-muted);
}

.footer {
    background: var(--surface);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    margin-top: 4rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

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

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

.tool-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    backdrop-filter: blur(4px);
}

.tool-modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.2s ease;
}

.modal-content {
    background: var(--surface);
    border-radius: var(--radius);
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.3s ease;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    margin: 0;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: 1.5rem;
}

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

@keyframes slideUp {
    from {
        transform: translateY(20px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        align-items: stretch;
    }
    
    .nav {
        justify-content: center;
    }
    
    .header-actions {
        justify-content: space-between;
    }
    
    .search-box {
        min-width: auto;
        flex: 1;
    }
    
    .filters {
        flex-direction: column;
        align-items: stretch;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}