/* Base styles */
        body {
            margin: 0;
            padding: 0;
            font-family: 'Inter', sans-serif;
            background-color: #f8fafc; /* Light background */
            color: #0f172a;
        }

        /* Header Styles */
        .site-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1rem 2rem;
            background-color: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border-bottom: 1px solid rgba(0, 0, 0, 0.05);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

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

        .logo-icon {
            width: 32px;
            height: 32px;
            color: #2563eb;
        }

        .title-group {
            display: flex;
            flex-direction: column;
        }

        .main-title {
            font-size: 1.25rem;
            font-weight: 700;
            margin: 0;
            background: linear-gradient(to right, #2563eb, #7c3aed);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .subtitle-group {
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .subtitle {
            font-size: 0.875rem;
            color: #64748b;
            margin: 0;
            font-family: 'JetBrains Mono', monospace;
        }

        .decorative-dots {
            display: flex;
            gap: 0.25rem;
        }

        @keyframes bounceDot {
            0%, 80%, 100% { transform: translateY(0); }
            40% { transform: translateY(-3px); }
        }

        .dot {
            width: 4px;
            height: 4px;
            border-radius: 50%;
            background-color: #3b82f6;
            animation: bounceDot 1.4s infinite ease-in-out both;
        }
        .dot:nth-child(1) { animation-delay: -0.32s; }
        .dot:nth-child(2) { background-color: #8b5cf6; animation-delay: -0.16s; }
        .dot:nth-child(3) { background-color: #ec4899; animation-delay: 0s; }

        .header-center {
            display: flex;
            gap: 0.5rem;
        }

        .nav-button {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.5rem 1rem;
            border: none;
            background: transparent;
            color: #64748b;
            font-size: 1rem;
            font-weight: 500;
            font-family: 'Inter', sans-serif;
            cursor: pointer;
            border-radius: 0.5rem;
            transition: all 0.2s;
        }

        .nav-button svg {
            width: 20px;
            height: 20px;
        }

        .nav-button:hover {
            color: #0f172a;
            background-color: rgba(0, 0, 0, 0.05);
        }

        .nav-button.active {
            color: #2563eb;
            background-color: rgba(37, 99, 235, 0.1);
        }

        .header-right {
            display: flex;
            align-items: center;
            justify-content: flex-end;
            gap: 1.5rem;
            flex: 1;
        }

        .update-time {
            font-size: 0.875rem;
            color: #64748b;
            font-family: 'JetBrains Mono', monospace;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .pulse-indicator {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background-color: #10b981;
            box-shadow: 0 0 8px rgba(16, 185, 129, 0.5);
            animation: pulse 2s infinite;
        }

        @keyframes pulse {
            0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
            70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
            100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
        }

        .action-button {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.5rem 1rem;
            border: 1px solid rgba(37, 99, 235, 0.3);
            background-color: rgba(37, 99, 235, 0.05);
            color: #2563eb;
            font-size: 0.875rem;
            font-weight: 600;
            border-radius: 0.5rem;
            cursor: pointer;
            transition: all 0.2s;
        }

        .action-button:hover {
            background-color: rgba(37, 99, 235, 0.1);
            border-color: #2563eb;
        }
        
        .action-button svg {
            width: 16px;
            height: 16px;
        }

        /* Main Content Container */
        .main-content {
            padding: 2rem;
            max-width: 1200px;
            margin: 0 auto;
        }

        /* Page Sections */
        .page-section {
            display: none;
        }
        .page-section.active {
            display: block;
            animation: fadeIn 0.3s ease-out;
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }

        /* Global Alert */
        .global-alert {
            display: flex;
            align-items: center;
            gap: 1rem;
            padding: 1rem;
            background-color: rgba(245, 158, 11, 0.1);
            border: 1px solid rgba(245, 158, 11, 0.3);
            border-radius: 0.5rem;
            color: #d97706;
            margin-bottom: 2rem;
        }

        .global-alert svg {
            width: 24px;
            height: 24px;
            flex-shrink: 0;
        }

        .alert-text {
            font-size: 0.875rem;
            line-height: 1.5;
        }

        /* Stats Bar */
        .stats-bar {
            display: flex;
            justify-content: space-between;
            align-items: center;
            background-color: #ffffff;
            border: 1px solid rgba(0, 0, 0, 0.05);
            box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
            border-radius: 1rem;
            padding: 1.5rem 2rem;
            margin-bottom: 2rem;
        }

        .stat-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 0.5rem;
            flex: 1;
        }

        .stat-value {
            font-size: 1.5rem;
            font-weight: 700;
            color: #0f172a;
            font-family: 'JetBrains Mono', monospace;
        }
        
        .stat-value small {
            font-size: 0.875rem;
            margin-left: 2px;
            color: #64748b;
        }

        .stat-label {
            font-size: 0.875rem;
            color: #64748b;
        }

        .stat-divider {
            width: 1px;
            height: 40px;
            background-color: rgba(0, 0, 0, 0.05);
        }

        /* Filter Bar */
        .filter-bar {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 2rem;
            gap: 1rem;
            flex-wrap: wrap;
        }

        .filter-tabs {
            display: flex;
            gap: 0.5rem;
            background-color: #ffffff;
            padding: 0.25rem;
            border-radius: 0.5rem;
            border: 1px solid rgba(0, 0, 0, 0.05);
            box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
        }

        .filter-tab {
            padding: 0.5rem 1rem;
            border: none;
            background: transparent;
            color: #64748b;
            font-size: 0.875rem;
            font-weight: 500;
            cursor: pointer;
            border-radius: 0.375rem;
            transition: all 0.2s;
        }

        .filter-tab.active, .filter-tab:hover {
            background-color: rgba(0, 0, 0, 0.05);
            color: #0f172a;
        }

        .search-box {
            flex: 1;
            max-width: 400px;
            position: relative;
        }

        .search-box input {
            width: 100%;
            padding: 0.75rem 1rem 0.75rem 2.5rem;
            background-color: #ffffff;
            border: 1px solid rgba(0, 0, 0, 0.1);
            border-radius: 0.5rem;
            color: #0f172a;
            font-family: 'Inter', sans-serif;
            box-sizing: border-box;
            box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
        }
        
        .search-box input:focus {
            outline: none;
            border-color: #2563eb;
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
        }

        .search-icon {
            position: absolute;
            left: 0.75rem;
            top: 50%;
            transform: translateY(-50%);
            width: 16px;
            height: 16px;
            color: #64748b;
        }

        .sort-select {
            padding: 0.75rem 1rem;
            background-color: #ffffff;
            border: 1px solid rgba(0, 0, 0, 0.1);
            border-radius: 0.5rem;
            color: #0f172a;
            font-family: 'Inter', sans-serif;
            cursor: pointer;
            appearance: none;
            -webkit-appearance: none;
            padding-right: 2.5rem;
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
            background-repeat: no-repeat;
            background-position: right 1rem center;
            box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
        }

        .sort-select:focus {
            outline: none;
            border-color: #2563eb;
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
        }
        
        .sort-select option {
            background-color: #ffffff;
            color: #0f172a;
        }

        /* Progress Banner */
        .progress-banner {
            display: none;
            align-items: center;
            justify-content: center;
            gap: 1rem;
            padding: 1.5rem;
            background: linear-gradient(90deg, rgba(37, 99, 235, 0.1), rgba(124, 58, 237, 0.1));
            border: 1px solid rgba(37, 99, 235, 0.2);
            border-radius: 0.5rem;
            margin-bottom: 2rem;
            color: #2563eb;
            font-weight: 500;
        }

        .progress-banner.active {
            display: flex;
        }

        .spinner {
            width: 20px;
            height: 20px;
            border: 2px solid rgba(37, 99, 235, 0.3);
            border-radius: 50%;
            border-top-color: #2563eb;
            animation: spin 1s linear infinite;
        }

        @keyframes spin {
            to { transform: rotate(360deg); }
        }

        /* Ranking List */
        #rankingList {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }

        /* Article Page Styles */
        .article-hero {
            display: flex;
            align-items: center;
            justify-content: space-between;
            background: linear-gradient(135deg, #ffffff, #f1f5f9);
            border: 1px solid rgba(0, 0, 0, 0.05);
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
            border-radius: 1rem;
            padding: 3rem;
            margin-bottom: 2rem;
            gap: 2rem;
        }

        .hero-text {
            flex: 1;
        }

        .hero-text h2 {
            font-size: 2.5rem;
            margin: 0 0 1rem 0;
            background: linear-gradient(to right, #2563eb, #7c3aed);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero-text p {
            font-size: 1.125rem;
            color: #475569;
            line-height: 1.6;
            margin: 0;
        }

        .hero-image-container {
            flex: 1;
            height: 200px;
            background-color: rgba(0, 0, 0, 0.02);
            border: 1px dashed rgba(0, 0, 0, 0.1);
            border-radius: 1rem;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #64748b;
        }

        .article-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
        }

        .article-card {
            background-color: #ffffff;
            border: 1px solid rgba(0, 0, 0, 0.05);
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
            border-radius: 1rem;
            padding: 2rem;
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
        }

        .article-card h3 {
            font-size: 1.5rem;
            margin: 0;
            color: #0f172a;
            border-bottom: 2px solid rgba(37, 99, 235, 0.3);
            padding-bottom: 0.5rem;
            display: inline-block;
        }

        /* Article 1: Flowchart & Progress Table */
        .horizontal-flow {
            display: flex;
            align-items: center;
            justify-content: space-between;
            background: #f8fafc;
            padding: 1rem;
            border-radius: 0.5rem;
            border: 1px solid rgba(0, 0, 0, 0.05);
        }

        .flow-step {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 0.5rem;
            text-align: center;
            flex: 1;
        }
        
        .flow-icon {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background-color: rgba(37, 99, 235, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #2563eb;
            font-weight: bold;
        }

        .flow-arrow {
            color: #94a3b8;
        }

        .protocol-table {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }

        .protocol-row {
            display: flex;
            align-items: center;
            gap: 1rem;
        }

        .protocol-name {
            width: 100px;
            font-weight: 500;
            color: #475569;
        }

        .protocol-bar-bg {
            flex: 1;
            height: 8px;
            background-color: rgba(0, 0, 0, 0.05);
            border-radius: 4px;
            overflow: hidden;
        }

        .protocol-bar-fill {
            height: 100%;
            background: linear-gradient(90deg, #3b82f6, #8b5cf6);
            border-radius: 4px;
        }

        .line-types {
            display: flex;
            gap: 1rem;
        }

        .line-card {
            flex: 1;
            background: #f8fafc;
            padding: 1rem;
            border-radius: 0.5rem;
            border: 1px solid rgba(0, 0, 0, 0.05);
        }

        .line-card h4 {
            margin: 0 0 0.5rem 0;
            color: #0284c7;
        }
        
        .line-card p {
            margin: 0;
            font-size: 0.875rem;
            color: #64748b;
        }

        /* Article 2: Buying Guide */
        .buying-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1rem;
        }

        .buying-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 0.5rem;
            background: #f8fafc;
            padding: 1rem;
            border-radius: 0.5rem;
            text-align: center;
            border: 1px solid rgba(0, 0, 0, 0.05);
            transition: transform 0.2s;
        }
        
        .buying-item:hover {
            transform: translateY(-2px);
            background: #f1f5f9;
        }

        .buying-item svg {
            width: 24px;
            height: 24px;
            color: #7c3aed;
        }

        .callout-box {
            background: rgba(16, 185, 129, 0.1);
            border-left: 4px solid #10b981;
            padding: 1rem;
            border-radius: 0 0.5rem 0.5rem 0;
            color: #475569;
        }
        .callout-box strong { color: #059669; display: block; margin-bottom: 0.5rem;}

        /* Article 3: Timeline */
        .timeline {
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
            position: relative;
            padding-left: 1.5rem;
        }

        .timeline::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 2px;
            background-color: rgba(37, 99, 235, 0.2);
        }

        .timeline-item {
            position: relative;
        }

        .timeline-dot {
            position: absolute;
            left: -1.5rem;
            top: 0.25rem;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background-color: #2563eb;
            transform: translateX(-5px);
            border: 2px solid #ffffff;
        }

        .timeline-content h4 {
            margin: 0 0 0.5rem 0;
            color: #0f172a;
        }
        .timeline-content p {
            margin: 0;
            font-size: 0.875rem;
            color: #64748b;
        }

        /* Article 4: Accordion FAQ */
        .accordion {
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }

        .accordion-item {
            border: 1px solid rgba(0, 0, 0, 0.05);
            border-radius: 0.5rem;
            overflow: hidden;
        }

        .accordion-header {
            width: 100%;
            padding: 1rem;
            background: #f8fafc;
            border: none;
            text-align: left;
            color: #0f172a;
            font-weight: 500;
            font-family: 'Inter', sans-serif;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: background 0.2s;
        }

        .accordion-header:hover {
            background: #f1f5f9;
        }

        .accordion-icon {
            transition: transform 0.3s;
        }

        .accordion-item.active .accordion-icon {
            transform: rotate(180deg);
        }

        .accordion-content {
            padding: 0 1rem;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out, padding 0.3s ease-out;
            background: #ffffff;
            color: #475569;
            font-size: 0.875rem;
            line-height: 1.6;
        }

        .accordion-item.active .accordion-content {
            padding: 1rem;
            max-height: 500px;
        }

        /* Tutorial Page Styles */
        .platform-tabs {
            display: flex;
            gap: 1rem;
            margin-bottom: 2rem;
            background: #ffffff;
            padding: 0.5rem;
            border-radius: 1rem;
            border: 1px solid rgba(0, 0, 0, 0.05);
            box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
            flex-wrap: wrap;
        }

        .platform-tab {
            flex: 1;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            padding: 1rem;
            background: transparent;
            border: 1px solid transparent;
            border-radius: 0.75rem;
            color: #64748b;
            font-size: 1rem;
            font-weight: 600;
            font-family: 'Inter', sans-serif;
            cursor: pointer;
            transition: all 0.2s;
            min-width: 120px;
        }

        .platform-tab svg {
            width: 24px;
            height: 24px;
        }

        .platform-tab:hover {
            color: #0f172a;
            background: rgba(0, 0, 0, 0.02);
        }

        .platform-tab.active {
            color: #2563eb;
            background: rgba(37, 99, 235, 0.05);
            border-color: rgba(37, 99, 235, 0.2);
        }

        #tutorialContent {
            background-color: #ffffff;
            border: 1px solid rgba(0, 0, 0, 0.05);
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
            border-radius: 1rem;
            padding: 2rem;
            min-height: 400px;
        }

        /* Modal Styles */
        #modalOverlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100vw;
            height: 100vh;
            background: rgba(0, 0, 0, 0.5);
            backdrop-filter: blur(5px);
            z-index: 2000;
            display: none;
            align-items: center;
            justify-content: center;
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        #modalOverlay.active {
            display: flex;
            opacity: 1;
        }

        #nodeModal {
            background-color: #ffffff;
            border: 1px solid rgba(0, 0, 0, 0.1);
            border-radius: 1rem;
            width: 90%;
            max-width: 900px;
            max-height: 90vh;
            display: flex;
            flex-direction: column;
            overflow: hidden;
            transform: scale(0.95);
            transition: transform 0.3s ease;
            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
        }

        #modalOverlay.active #nodeModal {
            transform: scale(1);
        }

        .modal-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 1.5rem;
            border-bottom: 1px solid rgba(0, 0, 0, 0.05);
            background: #f8fafc;
        }

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

        .modal-logo {
            width: 48px;
            height: 48px;
            background-color: rgba(37, 99, 235, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #2563eb;
            font-size: 1.5rem;
            font-weight: bold;
        }

        .hero-image-container {
            width: 400px;
            height: 250px;
            border-radius: 1rem;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            overflow: hidden;
            box-shadow: 0 10px 25px rgba(0,0,0,0.05);
        }
        .hero-image-container img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .modal-title-group h3 {
            margin: 0 0 0.25rem 0;
            color: #0f172a;
            font-size: 1.25rem;
        }

        .modal-title-group p {
            margin: 0;
            color: #64748b;
            font-size: 0.875rem;
        }

        .close-btn {
            background: transparent;
            border: none;
            color: #64748b;
            cursor: pointer;
            padding: 0.5rem;
            border-radius: 0.5rem;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.2s;
        }

        .close-btn:hover {
            background: rgba(0, 0, 0, 0.05);
            color: #0f172a;
        }

        .modal-body {
            padding: 1.5rem;
            overflow-y: auto;
            display: flex;
            flex-direction: column;
            gap: 2rem;
        }

        /* Modal Stats */
        .modal-stats {
            display: flex;
            gap: 1rem;
            background: #f8fafc;
            padding: 1rem;
            border-radius: 0.75rem;
            border: 1px solid rgba(0, 0, 0, 0.05);
        }
        
        .modal-stat-box {
            flex: 1;
            text-align: center;
            border-right: 1px solid rgba(0, 0, 0, 0.05);
        }
        .modal-stat-box:last-child {
            border-right: none;
        }

        .modal-section-title {
            font-size: 1.125rem;
            color: #475569;
            margin: 0 0 1rem 0;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        /* Node Filters & Grid placeholders */
        #nodeFilters {
            display: flex;
            gap: 0.5rem;
            margin-bottom: 1rem;
            flex-wrap: wrap;
        }
        
        #nodeGrid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 1rem;
        }

        #regionChart {
            height: 250px;
            background: #f8fafc;
            border: 1px dashed rgba(0, 0, 0, 0.1);
            border-radius: 0.75rem;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #64748b;
        }
/* Footer Styles */
.site-footer {
    background: #0f172a;
    color: #94a3b8;
    padding: 4rem 2rem 2rem;
    margin-top: 4rem;
    border-top: 1px solid #1e293b;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
}
.footer-container {
    max-width: 1200px;
    margin: 0 auto;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 2fr;
    gap: 3rem;
    margin-bottom: 3rem;
}
.brand-col .footer-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: #f8fafc;
    text-decoration: none;
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
}
.brand-col .logo-icon {
    width: 28px;
    height: 28px;
    color: #3b82f6;
}
.footer-slogan {
    line-height: 1.6;
    font-size: 0.95rem;
    color: #64748b;
}
.footer-heading {
    color: #f8fafc;
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}
.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}
.footer-links li {
    margin-bottom: 0.75rem;
}
.footer-links a {
    color: #94a3b8;
    text-decoration: none;
    transition: all 0.2s ease;
    display: inline-block;
}
.footer-links a:hover {
    color: #60a5fa;
    transform: translateX(4px);
}
.footer-compliance {
    font-size: 0.85rem;
    line-height: 1.6;
    color: #475569;
}
.footer-bottom {
    border-top: 1px solid #1e293b;
    padding-top: 2rem;
    text-align: center;
    font-size: 0.875rem;
    color: #475569;
}
@media (max-width: 992px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}
@media (max-width: 640px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

/* Header: no underline on nav links; wrap and scroll nav on narrow screens */
.nav-button { text-decoration: none; white-space: nowrap; }
@media (max-width: 1100px) {
    .site-header { flex-wrap: wrap; gap: 0.5rem 1rem; padding: 0.75rem 16px; }
    .header-center { order: 3; width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; scrollbar-width: none; }
    .header-center::-webkit-scrollbar { display: none; }
    .nav-button { padding: 0.4rem 0.75rem; font-size: 0.92rem; }
}