:root {
    --primary-color: #0078d4;
    --primary-dark: #005a9e;
    --secondary-color: #50e6ff;
    --background: #ffffff;
    --surface: #f5f5f5;
    --surface-hover: #e5e5e5;
    --text-primary: #1f1f1f;
    --text-secondary: #605e5c;
    --border: #e1dfdd;
    --shadow: rgba(0, 0, 0, 0.1);
    --shadow-hover: rgba(0, 0, 0, 0.15);
    --success: #107c10;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

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

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

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: var(--spacing-lg) 0;
    box-shadow: 0 2px 8px var(--shadow);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.logo h1 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.tagline {
    font-size: 1rem;
    opacity: 0.9;
}

.btn-github {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.1);
    color: white;
    text-decoration: none;
    border-radius: var(--border-radius);
    border: 1px solid rgba(255, 255, 255, 0.3);
    transition: var(--transition);
    font-weight: 500;
}

.btn-github:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

/* Main Layout */
.main {
    padding: var(--spacing-xl) 0;
}

.main .container {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: var(--spacing-xl);
}

/* Sidebar */
.sidebar {
    position: sticky;
    top: var(--spacing-md);
    height: fit-content;
}

.filter-section {
    background: var(--surface);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-md);
}

.filter-section h3 {
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

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

.filter-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs);
    cursor: pointer;
    border-radius: 4px;
    transition: var(--transition);
}

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

.filter-item input[type="checkbox"] {
    cursor: pointer;
    width: 18px;
    height: 18px;
}

.filter-item label {
    cursor: pointer;
    flex: 1;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.btn-clear {
    width: 100%;
    padding: var(--spacing-sm);
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: 500;
    transition: var(--transition);
}

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

/* Content */
.content {
    min-width: 0;
}

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

.content-header h2 {
    font-size: 1.75rem;
    color: var(--text-primary);
}

.search-box input {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    font-size: 1rem;
    width: 300px;
    transition: var(--transition);
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 120, 212, 0.1);
}

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

.sort-box label {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.sort-box select {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    font-size: 1rem;
    background-color: white;
    cursor: pointer;
    min-width: 150px;
    transition: var(--transition);
}

.sort-box select:hover {
    border-color: var(--primary-color);
}

.sort-box select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 120, 212, 0.1);
}

.lab-count {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Labs Grid */
.labs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
    gap: var(--spacing-lg);
}

.lab-card {
    background: white;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 2px 8px var(--shadow);
    transition: var(--transition);
    cursor: pointer;
    display: flex;
    flex-direction: column;
}

.lab-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 16px var(--shadow-hover);
}

.lab-image {
    width: 100%;
    height: 220px;
    object-fit: cover;
    background: var(--surface);
}

.lab-content {
    padding: var(--spacing-md);
    flex: 1;
    display: flex;
    flex-direction: column;
}

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

.lab-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    flex: 1;
    font-size: 0.95rem;
    line-height: 1.5;
}

.lab-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--surface);
    color: var(--text-secondary);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
}

.tag.category {
    background: rgba(0, 120, 212, 0.1);
    color: var(--primary-color);
}

.tag.service {
    background: rgba(16, 124, 16, 0.1);
    color: var(--success);
}

.lab-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--border);
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.lab-authors {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.author-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.author-link:hover {
    text-decoration: underline;
}

/* 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);
    overflow: auto;
    padding: var(--spacing-xl) var(--spacing-lg);
}

.modal-content {
    background-color: white;
    margin: var(--spacing-xl) auto;
    padding: 0;
    border-radius: var(--border-radius);
    max-width: 900px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    border: 5px solid transparent;
    position: relative;
}

.modal-close {
    position: absolute;
    right: var(--spacing-md);
    top: var(--spacing-md);
    font-size: 2rem;
    font-weight: bold;
    color: var(--text-secondary);
    cursor: pointer;
    z-index: 1;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: var(--transition);
}

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

.modal-body {
    padding: var(--spacing-xl);
    padding-top: calc(var(--spacing-xl) + 40px);
}

.modal-image {
    width: 100%;
    height: auto;
    margin-bottom: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px var(--shadow);
}

.modal-title {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.modal-meta {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border);
    flex-wrap: wrap;
}

.modal-meta-item h4 {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.modal-description {
    color: var(--text-primary);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

.modal-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: var(--border-radius);
    font-weight: 500;
    transition: var(--transition);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

/* No Results */
.no-results {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: white;
    padding: var(--spacing-lg) 0;
    margin-top: var(--spacing-xl);
}

.footer .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-links a {
    color: white;
    text-decoration: none;
    opacity: 0.8;
    transition: var(--transition);
}

.footer-links a:hover {
    opacity: 1;
}

/* Responsive */
@media (max-width: 1024px) {
    .main .container {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: static;
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: var(--spacing-md);
    }

    .btn-clear {
        grid-column: 1 / -1;
    }
}

@media (max-width: 768px) {
    .labs-grid {
        grid-template-columns: 1fr;
    }

    .header-content {
        flex-direction: column;
        align-items: flex-start;
    }

    .search-box input {
        width: 100%;
    }

    .content-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .modal-content {
        margin: 0;
        border-radius: 0;
        max-width: 100%;
        height: 100%;
    }

    .modal-body {
        padding: var(--spacing-md);
    }
}