:root {
    /* Colors */
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --accent: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;

    /* Background */
    --background: #ffffff;
    --background-alt: #f8fafc;
    --surface: #ffffff;

    /* Text */
    --text: #0f172a;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;

    /* Borders & Effects */
    --border: #e2e8f0;
    --border-radius: 0.5rem;
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px 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);
    --transition: all 0.2s ease;

    /* Layout */
    --sidebar-width: 300px;
    --navbar-height: 60px;
    --content-padding: 2rem;

    /* Breakpoints */
    --mobile-breakpoint: 768px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background: var(--background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.app-layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: var(--sidebar-width);
    background: var(--surface);
    border-right: 1px solid var(--border);
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    overflow-y: auto;
    z-index: 100;
    box-shadow: var(--shadow);
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
    background: var(--background-alt);
}

.sidebar-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 0.5rem;
}

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

.nav-links {
    list-style: none;
    padding: 1rem 0;
}

.nav-links li {
    margin: 0;
}

.nav-links a {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.75rem 1.5rem;
    transition: var(--transition);
    font-weight: 500;
    font-size: 0.875rem;
    border-left: 3px solid transparent;
    cursor: pointer;
}

.nav-links a:hover {
    background: var(--background-alt);
    color: var(--primary-color);
    border-left-color: var(--primary-color);
}

.nav-links a.active {
    background: var(--primary-color);
    color: white;
    border-left-color: var(--primary-hover);
}

.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
}

.content-container {
    padding: var(--content-padding);
}

.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
    color: white;
    padding: 2rem 0;
    position: relative;
    overflow: hidden;
    border-bottom: 1px solid var(--border);
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="2" fill="white" opacity="0.1"/></svg>') repeat;
    background-size: 40px 40px;
}

.header-content {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

.stats {
    display: flex;
    gap: 2rem;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}

.stat {
    background: rgba(255, 255, 255, 0.1);
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    backdrop-filter: blur(10px);
}

.stat-number {
    font-size: 1.5rem;
    font-weight: 600;
    display: block;
}

.stat-label {
    font-size: 0.875rem;
    opacity: 0.8;
}

.search-container {
    margin: 2rem 0;
    position: relative;
    background: var(--surface);
    padding: 1.5rem;
}

.search-box {
    width: 100%;
    padding: 1rem 1.5rem 1rem 3rem;
    border: 2px solid var(--border);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    background: var(--surface);
}

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

.search-icon {
    position: absolute;
    left: 2.5rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 1.2rem;
}

.filters {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    align-items: center;
}

.filter-group {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    padding: 0.5rem;
    background: var(--background-alt);
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
}

.filter-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.filter-btn {
    padding: 0.5rem 1rem;
    background: var(--background-alt);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.875rem;
}

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

.overview-intro {
    max-width: 68rem;
    color: var(--text-secondary);
}

.overview-stats {
    display: flex;
    gap: 3rem;
    margin: 2rem 0;
    flex-wrap: wrap;
}

.overview-stat h3 {
    margin-bottom: 0.25rem;
    color: var(--primary-color);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.overview-stat p {
    color: var(--text);
    font-size: 1rem;
    font-weight: 600;
}

.release-note {
    display: grid;
    grid-template-columns: minmax(14rem, 0.8fr) minmax(0, 1.7fr);
    gap: 2.5rem;
    margin: 2rem 0;
    padding: 1.5rem;
    background: var(--background-alt);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
}

.release-note-heading h3 {
    margin-bottom: 0.5rem;
    font-size: 1.25rem;
    line-height: 1.25;
}

.release-note-heading > p:last-child,
.release-note-item p,
.legal-note {
    color: var(--text-secondary);
}

.release-note-grid {
    display: grid;
    gap: 1.25rem;
}

.release-note-item {
    display: grid;
    grid-template-columns: 3.25rem 1fr;
    gap: 1rem;
    align-items: start;
}

.release-note-label {
    padding: 0.25rem 0.4rem;
    color: var(--primary-color);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0.25rem;
    font-family: 'Courier New', monospace;
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-align: center;
}

.release-note-item h4 {
    margin-bottom: 0.2rem;
    font-size: 1rem;
}

.release-note-item p,
.legal-note {
    font-size: 0.875rem;
}

.legal-note {
    max-width: 68rem;
}

.def-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
    gap: 1.5rem;
}

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

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

.def-item.expanded {
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.def-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.def-name {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text);
}

.def-type {
    background: var(--primary-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.extension-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.extension-badge.core {
    background: #64748b;
    color: white;
}

.extension-badge.royalty {
    background: #7c3aed;
    color: white;
}

.extension-badge.ideology {
    background: #059669;
    color: white;
}

.extension-badge.biotech {
    background: #dc2626;
    color: white;
}

.extension-badge.anomaly {
    background: #7c2d12;
    color: white;
}

.extension-badge.odyssey {
    background: #0891b2;
    color: white;
}

.extension-badge.unknown {
    background: var(--text-muted);
    color: white;
}

.def-description {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.5;
}

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

.tag {
    display: inline-block;
    background: var(--background-alt);
    color: var(--text-secondary);
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.75rem;
    font-weight: 500;
}

.tag.abstract {
    background: var(--warning);
    color: white;
}

.tag.parent {
    background: var(--accent);
    color: white;
}

.sidebar-filter-info {
    margin-top: 0.5rem;
    font-size: 0.75rem;
    color: var(--warning);
}

.category-header {
    margin-bottom: 2rem;
}

.category-title {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
}

.category-count {
    color: var(--text-secondary);
}

.def-label {
    font-style: italic;
    color: var(--text-muted);
    margin-left: auto;
}

.def-parent {
    margin-bottom: 1rem;
}

.def-parent-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.def-parent-name {
    font-size: 0.875rem;
    color: var(--text);
}

.file-path {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 1rem;
    word-break: break-all;
}

.def-details {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
}

.reference-section {
    margin-bottom: 1rem;
}

.reference-section h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

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

.reference-item {
    background: var(--background-alt);
    padding: 0.25rem 0.75rem;
    border-radius: 0.25rem;
    font-size: 0.75rem;
    color: var(--primary-color);
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid var(--border);
}

.reference-item:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.code-reference-item {
    background: #1e1e1e;
    color: #9cdcfe;
    padding: 0.25rem 0.75rem;
    border-radius: 0.25rem;
    font-size: 0.75rem;
    font-family: 'Courier New', monospace;
    transition: var(--transition);
    border: 1px solid var(--border);
    display: inline-block;
}

.code-reference-item:hover {
    background: #2d2d2d;
    border-color: #9cdcfe;
}

.ref-type-badge {
    background: var(--primary-color);
    color: white;
    padding: 0.125rem 0.5rem;
    border-radius: 0.75rem;
    font-size: 0.625rem;
    font-weight: 500;
    margin-left: 0.5rem;
    opacity: 0.8;
}

.no-references {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-style: italic;
}

.expand-indicator {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--background-alt);
    border-radius: 50%;
    color: var(--text-secondary);
    font-size: 0.875rem;
    transition: var(--transition);
}

.xml-section {
    margin-top: 1rem;
    padding: 1rem;
    background: var(--background-alt);
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
}

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

/* Button Styles */
.xml-toggle,
.xml-copy {
    border: none;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 0.875rem;
    transition: var(--transition);
    color: white;
}

.xml-toggle {
    background: var(--primary-color);
}

.xml-toggle:hover {
    background: var(--primary-hover);
}

.xml-copy {
    background: var(--secondary-color);
    color: white;
    margin-left: 0.5rem;
}

.xml-copy:hover {
    background: var(--text-secondary);
}

.xml-display {
    background: #1e1e1e;
    color: #d4d4d4;
    padding: 1rem;
    border-radius: var(--border-radius);
    overflow-x: auto;
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.4;
    white-space: pre;
    max-height: 400px;
    overflow-y: auto;
    border: 1px solid var(--border);
}

.xml-display .xml-tag {
    color: #569cd6;
}

.xml-display .xml-attr {
    color: #9cdcfe;
}

.xml-display .xml-value {
    color: #ce9178;
}

.xml-display .xml-content {
    color: #d4d4d4;
}

.xml-display .xml-class-value {
    color: #4ec9b0;
    font-weight: 500;
}

.xml-display .xml-comment {
    color: #608b4e;
    font-style: italic;
}

.xml-display .xml-cdata {
    color: #d7ba7d;
    background-color: rgba(215, 186, 125, 0.1);
    padding: 0 2px;
}

.xml-display .xml-declaration {
    color: #c586c0;
    font-weight: 500;
}

.def-item:hover .expand-indicator {
    background: var(--primary-color);
    color: white;
}

.def-item.expanded .expand-indicator {
    transform: rotate(180deg);
}

.loading {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

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

.error {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--danger);
}

.results-counter {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--primary-color);
    color: white;
    padding: 0.75rem 1.25rem;
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    backdrop-filter: blur(10px);
}

/* Mobile Navbar */
.mobile-navbar {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--navbar-height);
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    align-items: center;
    justify-content: space-between;
    padding: 0 1rem;
    box-shadow: var(--shadow);
}

.mobile-navbar-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text);
}

.mobile-menu-toggle {
    background: none;
    border: none;
    color: var(--text);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.mobile-menu-toggle:hover {
    background: var(--background-alt);
}

.mobile-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99;
    backdrop-filter: blur(2px);
}

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

/* Mobile Responsive Design */
@media (max-width: 768px) {
    /* Show mobile navbar */
    .mobile-navbar {
        display: flex;
    }

    /* Adjust sidebar for mobile */
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        top: var(--navbar-height);
        height: calc(100vh - var(--navbar-height));
    }

    .sidebar.open {
        transform: translateX(0);
    }

    /* Adjust main content */
    .main-content {
        margin-left: 0;
        padding-top: var(--navbar-height);
    }

    /* Responsive content adjustments */
    .content-container {
        padding: 1rem;
    }

    .header-content {
        padding: 0 1rem;
    }

    .header h1 {
        font-size: 1.875rem;
    }

    .stats {
        gap: 1rem;
    }

    /* Single column grid on mobile */
    .def-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    /* Stack def header elements */
    .def-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    /* Adjust spacing */
    .search-container {
        margin: 1rem 0;
        padding: 1rem;
    }

    .filters {
        flex-direction: column;
        gap: 0.75rem;
        align-items: stretch;
    }

    .release-note {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        padding: 1.5rem;
    }

    .filter-group {
        width: 100%;
    }

    /* Hide results counter on mobile to avoid overlap */
    .results-counter {
        bottom: 1rem;
        right: 1rem;
        padding: 0.5rem 1rem;
        font-size: 0.75rem;
    }
}