/* Make sure this class exists in your CSS */
        .zoomable-image {
            cursor: zoom-in;
            transition: background 0.2s;
            position: relative;
        }

        .zoomable-image.zoomed {
            cursor: zoom-out;
            background: rgba(0,0,0,0.95);
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            z-index: 1000;
            padding: 2rem;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0;
        }

        .zoomable-image.zoomed img {
            max-width: 95vw;
            max-height: 95vh;
            width: auto;
            height: auto;
            object-fit: contain;
            box-shadow: 0 25px 50px rgba(0,0,0,0.5);
        }

        .zoomable-image img {
            max-width: 100%;
            height: auto;
            max-height: 400px;
            border-radius: 16px;
            box-shadow: 0 12px 28px rgba(0,0,0,0.05);
            transition: transform 0.3s ease;
            pointer-events: none;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background: #f6f8fa;
            color: #1f2a3f;
            line-height: 1.6;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 2.5rem 2rem;
        }

        /* Typography */
        h1 {
            font-size: 3rem;
            font-weight: 500;
            letter-spacing: -0.02em;
            color: #0b1c33;
            line-height: 1.2;
        }

        h2 {
            font-size: 1.75rem;
            font-weight: 500;
            color: #0b1c33;
            margin-bottom: 1.5rem;
        }

        h3 {
            font-size: 1.2rem;
            font-weight: 600;
            color: #2c3e58;
            margin-bottom: 1rem;
        }

        /* Header */
        .header {
            margin-bottom: 3rem;
            display: flex;
            justify-content: space-between;
            align-items: flex-end;
            flex-wrap: wrap;
            gap: 1.5rem;
        }

        .header-left p {
            font-size: 1.2rem;
            color: #546e7a;
            margin-top: 0.5rem;
        }

        .network-badge {
            background: white;
            padding: 0.8rem 1.5rem;
            border-radius: 100px;
            font-weight: 500;
            box-shadow: 0 2px 8px rgba(0,0,0,0.03);
            border: 1px solid #e2e9f0;
            color: #0b1c33;
        }

        /* Image Section with Zoom */
        .topology-section {
            background: white;
            border-radius: 28px;
            border: 1px solid #e2e9f0;
            overflow: hidden;
            margin-bottom: 3rem;
            box-shadow: 0 8px 20px rgba(0,0,0,0.02);
        }

        .topology-header {
            padding: 1.5rem 2rem;
            border-bottom: 1px solid #e2e9f0;
            background: #fafcfd;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .topology-header h2 {
            margin-bottom: 0;
            font-size: 1.3rem;
            font-weight: 500;
        }

        .zoom-hint {
            color: #546e7a;
            font-size: 0.9rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .zoom-hint span {
            font-size: 1.2rem;
        }

        .topology-image {
            padding: 2rem;
            background: #ffffff;
            display: flex;
            justify-content: center;
            cursor: zoom-in;
            transition: background 0.2s;
            position: relative;
        }

        .topology-image img {
            max-width: 100%;
            height: auto;
            max-height: 400px;
            border-radius: 16px;
            box-shadow: 0 12px 28px rgba(0,0,0,0.05);
            transition: transform 0.3s ease;
            pointer-events: none;
        }

        .topology-image.zoomed {
            cursor: zoom-out;
            background: rgba(0,0,0,0.95);
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            z-index: 1000;
            padding: 2rem;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0;
        }

        .topology-image.zoomed img {
            max-width: 95vw;
            max-height: 95vh;
            width: auto;
            height: auto;
            object-fit: contain;
            box-shadow: 0 25px 50px rgba(0,0,0,0.5);
        }

        /* Download Section */
        .download-card {
            background: white;
            border-radius: 28px;
            border: 1px solid #e2e9f0;
            padding: 2rem;
            margin-bottom: 3rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 1.5rem;
        }

        .download-text h3 {
            margin-bottom: 0.25rem;
        }

        .download-text p {
            color: #546e7a;
        }

        .download-link {
            background: #0b1c33;
            color: white;
            padding: 1rem 2.5rem;
            border-radius: 60px;
            text-decoration: none;
            font-weight: 500;
            transition: background 0.2s;
            display: inline-block;
        }

        .download-link:hover {
            background: #1e3a5f;
        }

        /* Network Summary */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1rem;
            margin-bottom: 3rem;
        }

        .stat-item {
            background: white;
            border-radius: 20px;
            padding: 1.5rem;
            border: 1px solid #e2e9f0;
        }

        .stat-label {
            font-size: 0.85rem;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            color: #546e7a;
            margin-bottom: 0.5rem;
        }

        .stat-number {
            font-size: 2rem;
            font-weight: 500;
            color: #0b1c33;
        }

        /* VLAN Cards */
        .vlan-container {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.5rem;
            margin-bottom: 3rem;
        }

        .vlan-card {
            background: white;
            border-radius: 24px;
            border: 1px solid #e2e9f0;
            overflow: hidden;
        }

        .vlan-title {
            padding: 1.5rem;
            font-size: 1.5rem;
            font-weight: 500;
            border-bottom: 1px solid #e2e9f0;
        }

        .vlan-title.student { background: #f0f7f2; color: #1f7042; }
        .vlan-title.teacher { background: #fef0ef; color: #b13e3e; }
        .vlan-title.staff { background: #fff5e8; color: #b86b1f; }

        .vlan-content {
            padding: 1.5rem;
        }

        .ip-row {
            display: flex;
            justify-content: space-between;
            padding: 0.75rem 0;
            border-bottom: 1px solid #edf2f7;
            font-size: 0.95rem;
        }

        .ip-row:last-child {
            border-bottom: none;
        }

        .ip-label {
            color: #546e7a;
        }

        .ip-value {
            font-family: 'SF Mono', 'Fira Code', monospace;
            font-weight: 500;
            color: #0b1c33;
        }

        .pc-list {
            margin-top: 1.5rem;
            background: #f8fafd;
            padding: 1rem;
            border-radius: 16px;
        }

        .pc-item {
            font-family: 'SF Mono', monospace;
            font-size: 0.9rem;
            padding: 0.4rem 0;
            color: #2c3e58;
        }

        /* Router Control */
        .router-control {
            background: white;
            border-radius: 28px;
            border: 1px solid #e2e9f0;
            padding: 1.8rem;
            margin-bottom: 3rem;
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 2rem;
        }

        .router-buttons {
            display: flex;
            gap: 0.8rem;
        }

        .router-btn {
            padding: 0.8rem 2rem;
            border-radius: 60px;
            font-weight: 500;
            border: none;
            cursor: pointer;
            font-size: 1rem;
            transition: 0.2s;
        }

        .btn-on {
            background: #1f7042;
            color: white;
        }

        .btn-on:hover {
            background: #2a8f55;
        }

        .btn-off {
            background: #b13e3e;
            color: white;
        }

        .btn-off:hover {
            background: #c44545;
        }

        .status {
            font-size: 1rem;
            padding: 0.8rem 1.5rem;
            background: #f8fafd;
            border-radius: 60px;
            border: 1px solid #e2e9f0;
            color: #0b1c33;
            flex: 1;
            min-width: 250px;
        }

        /* Configuration Steps */
        .steps {
            display: flex;
            flex-direction: column;
            gap: 2rem;
            margin-bottom: 3rem;
        }

        .step {
            background: white;
            border-radius: 24px;
            border: 1px solid #e2e9f0;
            overflow: hidden;
        }

        .step-header {
            padding: 1.5rem 2rem;
            background: #fafcfd;
            border-bottom: 1px solid #e2e9f0;
            display: flex;
            align-items: center;
            gap: 1rem;
        }

        .step-number {
            width: 36px;
            height: 36px;
            background: #0b1c33;
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 500;
        }

        .step-title {
            font-size: 1.3rem;
            font-weight: 500;
        }

        .step-content {
            padding: 2rem;
        }

        /* CLI Command Styling - Authentic Router/Switch Format */
        .cli {
            background: #0f1a27;
            border-radius: 20px;
            padding: 1.5rem;
            font-family: 'SF Mono', 'Fira Code', 'Courier New', monospace;
            font-size: 0.95rem;
            line-height: 1.8;
            overflow-x: auto;
            white-space: pre-wrap;
            border-left: 4px solid #3b82f6;
            color: #e2e8f0;
        }

        .cli .prompt {
            color: #88dd88;
            font-weight: 500;
        }

        .cli .config-prompt {
            color: #ffaa66;
        }

        .cli .comment {
            color: #94a3b8;
            font-style: italic;
        }

        .cli-output {
            background: #1a2634;
            border-radius: 16px;
            padding: 1.2rem;
            font-family: 'SF Mono', monospace;
            font-size: 0.9rem;
            color: #fbbf6d;
            margin-top: 1rem;
            border-left: 4px solid #f59e0b;
        }

        /* PC Grid */
        .pc-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1rem;
            margin: 1.5rem 0;
        }

        .pc-card {
            background: #f8fafd;
            padding: 1rem;
            border-radius: 16px;
            border: 1px solid #e2e9f0;
        }

        .pc-card h4 {
            font-size: 1rem;
            margin-bottom: 0.8rem;
            color: #0b1c33;
        }

        .pc-card p {
            font-family: 'SF Mono', monospace;
            font-size: 0.9rem;
            padding: 0.3rem 0;
            border-bottom: 1px dashed #d0ddee;
        }

        /* Table */
        .table-wrapper {
            overflow-x: auto;
            margin: 1.5rem 0 3rem;
            border-radius: 20px;
            border: 1px solid #e2e9f0;
        }

        table {
            width: 100%;
            border-collapse: collapse;
            background: white;
            border-radius: 20px;
        }

        th {
            background: #f8fafd;
            padding: 1rem;
            font-weight: 500;
            text-align: left;
            border-bottom: 1px solid #e2e9f0;
        }

        td {
            padding: 1rem;
            border-bottom: 1px solid #edf2f7;
        }

        .success { color: #1f7042; font-weight: 500; }
        .fail { color: #b13e3e; font-weight: 500; }

        /* Footer */
        .footer {
            margin-top: 5rem;
            padding: 3rem 0 2rem;
            border-top: 2px solid #e2e9f0;
        }

        .footer-content {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 2rem;
            margin-bottom: 3rem;
        }

        .footer-column h4 {
            font-size: 1rem;
            font-weight: 600;
            color: #0b1c33;
            margin-bottom: 1.2rem;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

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

        .footer-column li {
            margin-bottom: 0.7rem;
        }

        .footer-column a {
            color: #546e7a;
            text-decoration: none;
            font-size: 0.95rem;
            transition: color 0.2s;
        }

        .footer-column a:hover {
            color: #0b1c33;
        }

        .footer-bottom {
            border-top: 1px solid #e2e9f0;
            padding-top: 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 1rem;
        }

        .creator-name {
            font-size: 1.5rem;
            font-weight: 500;
            color: #0b1c33;
            letter-spacing: -0.02em;
        }

        .copyright {
            color: #546e7a;
            font-size: 0.9rem;
        }

        .footer-links {
            display: flex;
            gap: 2rem;
        }

        .footer-links a {
            color: #546e7a;
            text-decoration: none;
            font-size: 0.9rem;
        }

        .footer-links a:hover {
            color: #0b1c33;
        }

        /* Responsive */
        @media (max-width: 900px) {
            .stats-grid { grid-template-columns: repeat(2, 1fr); }
            .vlan-container { grid-template-columns: 1fr; }
            .pc-grid { grid-template-columns: 1fr; }
            h1 { font-size: 2.5rem; }
            .footer-content { grid-template-columns: repeat(2, 1fr); }
        }

        @media (max-width: 600px) {
            .stats-grid { grid-template-columns: 1fr; }
            .router-control { flex-direction: column; align-items: flex-start; }
            .container { padding: 1.5rem; }
            .footer-content { grid-template-columns: 1fr; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .footer-links { justify-content: center; }
        }