styles.css

/* Reset and Base Styles */
* {
    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: #333;
    background-color: #fafafa;
    margin-right: 0;
    padding: 0 5px; /* 5px buffer on left and right edges */
    transition: margin-right 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 100px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-section::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"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-section h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.subtitle-large {
    font-size: 2rem;
    font-weight: 500;
    margin-bottom: 1rem;
    opacity: 0.95;
}

.subtitle {
    font-size: 1.25rem;
    font-weight: 400;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-top: 2rem;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: #fff;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.8;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Architecture Visualization Section */
.architecture-viz {
    padding: 80px 0;
    background: #fff;
}

.architecture-viz h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 3rem;
    color: #2c3e50;
}

#d3-container {
    width: 100%;
    height: 800px;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    background: #fafafa;
    position: relative;
    overflow: hidden;
}

.interaction-guide {
    text-align: center;
    margin-top: 1rem;
    color: #666;
    font-size: 0.9rem;
}

/* Challenge Solution Section */
.challenge-solution {
    padding: 80px 0;
    background: #f8f9fa;
}

.challenge-solution h2 {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 2rem;
    color: #2c3e50;
}

.challenge-solution p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 3rem;
    color: #555;
}

.technical-highlights {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.highlight {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.highlight:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.highlight h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #2c3e50;
}

.highlight p {
    color: #666;
    margin-bottom: 0;
}

/* Problem Solving Section */
.problem-solving {
    padding: 80px 0;
    background: #fff;
}

.problem-solving h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 3rem;
    color: #2c3e50;
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.problem-card {
    background: #f8f9fa;
    border: 1px solid #e9ecef;
    border-radius: 8px;
    padding: 2rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.problem-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.problem-card h3 {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #2c3e50;
}

.problem-card p {
    margin-bottom: 1rem;
    color: #555;
}

.problem-card ul {
    list-style: none;
    padding-left: 0;
}

.problem-card li {
    padding: 0.25rem 0;
    color: #666;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.9rem;
}

/* Code Sections */
.code-section {
    margin: 20px 0;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.code-header {
    background: #2d3748;
    color: #e2e8f0;
    padding: 12px 20px;
    font-weight: 600;
    font-size: 14px;
    border-bottom: 1px solid #4a5568;
}

pre {
    background: #1a202c;
    color: #e2e8f0;
    padding: 20px;
    margin: 0;
    overflow-x: auto;
    font-family: 'Fira Code', 'Consolas', monospace;
    font-size: 14px;
    line-height: 1.5;
}

code {
    font-family: 'Consolas', 'Monaco', monospace;
}


/* D3.js Visualization Styles */
.vpc-layer {
    fill: none;
    stroke: #ddd;
    stroke-width: 2;
}

.subnet-public {
    fill: #e3f2fd;
    stroke: #90caf9;
    stroke-width: 1;
}

.subnet-private {
    fill: #e8f5e8;
    stroke: #81c784;
    stroke-width: 1;
}

.instance {
    cursor: grab;
    /* Removed conflicting CSS transform - handled by D3.js */
}

.instance.dragging {
    cursor: grabbing;
    opacity: 0.8;
}

.instance:active {
    cursor: grabbing;
}

.instance-circle {
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.connection-line {
    stroke: #999;
    stroke-width: 2;
    stroke-opacity: 0.6;
    fill: none;
    transition: all 0.3s ease;
}

.connection-line.api {
    stroke: #7b1fa2;
    stroke-dasharray: 5,5;
}

.connection-line.ssh {
    stroke: #f57c00;
    stroke-dasharray: 3,3;
}


.connection-line.preview {
    stroke-opacity: 0.8;
    stroke-width: 3;
}

.security-group {
    fill: none;
    stroke-width: 2;
    stroke-dasharray: 5,5;
    opacity: 0.7;
}

.security-group.bastion {
    stroke: #f57c00;
}

.security-group.private {
    stroke: #4caf50;
}

.instance-label {
    font-family: 'Inter', sans-serif;
    font-size: 12px;
    font-weight: 500;
    text-anchor: middle;
    fill: #333;
}

.port-label {
    font-family: 'Consolas', monospace;
    font-size: 13px;
    text-anchor: middle;
    fill: #666;
}

/* Detail Panel / Sidebar Styles */
.detail-panel {
    font-family: 'Inter', sans-serif;
}

.detail-panel.sidebar {
    border-radius: 0;
}

.sidebar-header {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(15px);
    z-index: 1001;
}

.sidebar-content {
    scrollbar-width: thin;
    scrollbar-color: #cbd5e0 transparent;
}

.sidebar-content::-webkit-scrollbar {
    width: 6px;
}

.sidebar-content::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar-content::-webkit-scrollbar-thumb {
    background-color: #cbd5e0;
    border-radius: 3px;
}

.sidebar-content::-webkit-scrollbar-thumb:hover {
    background-color: #a0aec0;
}

.detail-panel h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    line-height: 1.2;
}

.detail-panel h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #2c3e50;
}

.detail-panel h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #4a5568;
}

.detail-panel p {
    margin-bottom: 1rem;
    color: #666;
    line-height: 1.6;
}

.technical-details ul {
    list-style: none;
    padding: 0;
}

.technical-details li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid #f0f0f0;
}

.technical-details li:last-child {
    border-bottom: none;
}

.technical-details strong {
    color: #2c3e50;
}

.technical-details span {
    font-family: 'Consolas', monospace;
    background: #f5f5f5;
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 0.9rem;
}

.close-btn {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: #666;
    transition: color 0.3s ease;
}

.close-btn:hover {
    color: #333;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-section h1 {
        font-size: 2.5rem;
    }
    
    .subtitle-large {
        font-size: 1.5rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 1rem;
    }
    
    .stat {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 1rem;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .technical-highlights {
        grid-template-columns: 1fr;
    }
    
    .problem-grid {
        grid-template-columns: 1fr;
    }
    
    #d3-container {
        height: 600px;
    }
}

@media (max-width: 480px) {
    .hero-section h1 {
        font-size: 2rem;
    }
    
    .subtitle-large {
        font-size: 1.25rem;
    }
    
    .container {
        padding: 0 15px;
    }
    
    .hero-section {
        padding: 60px 0;
    }
    
    .architecture-viz,
    .challenge-solution,
    .problem-solving {
        padding: 60px 0;
    }
    
    #d3-container {
        height: 400px;
    }
}