/* Modern CSS Reset */
*,
*::before,
*::after {
    box-sizing: border-box;
}

* {
    margin: 0;
    padding: 0;
}

/* Root Variables - Clean Modern Theme */
:root {
    /* Colors - Clean and minimal */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --accent-primary: #3b82f6;
    --accent-hover: #2563eb;
    --accent-light: #dbeafe;
    --accent-purple: #8b5cf6;
    --accent-purple-light: #ede9fe;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-primary: #e2e8f0;
    --border-accent: #3b82f6;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px 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);
    
    /* Typography */
    --font-mono: 'JetBrains Mono', 'SF Mono', 'Monaco', 'Consolas', monospace;
    --font-sans: 'Poppins', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    
    /* Animation */
    --transition: all 0.2s ease;
    --transition-slow: all 0.3s ease;
}

/* Base Styles */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-size: 16px;
}

/* Navigation */
.nav {
    border-bottom: 1px solid var(--border-primary);
    background: var(--bg-primary);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(8px);
}

.nav-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-weight: 600;
    font-size: 1.25rem;
    color: var(--text-primary);
}

.logo-icon {
    font-size: 1.5rem;
}

.github-link {
    color: var(--text-secondary);
    transition: var(--transition);
    display: flex;
    align-items: center;
    padding: var(--space-xs);
    border-radius: 6px;
}

.github-link:hover {
    color: var(--text-primary);
    background: var(--bg-secondary);
}

/* Main Content */
.main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

/* Hero Section */
.hero {
    text-align: center;
    padding: var(--space-xl) 0 var(--space-lg) 0;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    line-height: 1.5;
}

/* Demo Section */
.demo {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: var(--space-lg);
    margin: 0 0 var(--space-xl) 0;
    border: 1px solid var(--border-primary);
}

.demo-content {
    max-width: 700px;
    margin: 0 auto;
}

.command-section {
    margin-bottom: var(--space-lg);
}

.command-section:last-of-type {
    margin-bottom: var(--space-md);
}

.command-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--space-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.command-block {
    position: relative;
    background: var(--text-primary);
    color: var(--bg-primary);
    border-radius: 8px;
    overflow: hidden;
    font-family: var(--font-mono);
    margin-bottom: var(--space-xs);
    width: 100%;
    max-width: 1000px;
}

.command-text {
    display: block;
    padding: var(--space-md);
    font-size: 0.9rem;
    line-height: 1.4;
    margin: 0;
    background: transparent;
    border: none;
    white-space: pre-wrap;
    word-break: break-all;
    user-select: all; /* Make text easily selectable */
    -webkit-user-select: all;
    -moz-user-select: all;
}


.port-note {
    font-size: 0.95rem;
    color: var(--text-muted);
    text-align: center;
}

.port-note code {
    background: var(--bg-tertiary);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.8em;
    color: var(--accent-primary);
}

.result-section {
    text-align: center;
}

.result-arrow {
    font-size: 1.5rem;
    color: var(--text-muted);
    margin-bottom: var(--space-sm);
}

.result-box {
    background: var(--accent-purple-light);
    color: var(--accent-purple);
    padding: var(--space-md);
    border-radius: 8px;
    border: 1px solid var(--accent-purple);
}

.result-text {
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: var(--space-xs);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
}

.result-emoji {
    font-size: 1.25rem;
}

.result-note {
    font-size: 0.875rem;
    opacity: 0.8;
}

/* Features Section */
.features {
    padding: var(--space-xl) 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-lg);
    max-width: 1000px;
    margin: 0 auto;
}

.feature {
    text-align: center;
    padding: var(--space-md);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-sm);
    display: block;
}

.feature-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.feature-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
}

/* How it Works Section */
.how-it-works {
    padding: var(--space-xl) 0;
}

.section-title {
    font-size: 2rem;
    font-weight: 600;
    text-align: center;
    color: var(--text-primary);
    margin-bottom: var(--space-xl);
}

/* Diagram */
.diagram {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-2xl);
    padding: var(--space-lg) 0;
    overflow-x: auto;
}

.diagram-item {
    flex-shrink: 0;
}

.diagram-box {
    background: var(--bg-secondary);
    border: 2px solid var(--border-primary);
    border-radius: 12px;
    padding: var(--space-md);
    text-align: center;
    min-width: 120px;
    transition: var(--transition);
}

.diagram-box:hover {
    border-color: var(--accent-purple);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.diagram-icon {
    font-size: 2rem;
    margin-bottom: var(--space-xs);
}

.diagram-label {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.diagram-detail {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

.diagram-arrow {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    color: var(--text-muted);
}

.arrow-label {
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.steps {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
    max-width: 600px;
    margin: 0 auto;
}

.step {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
}

.step-number {
    background: var(--accent-purple);
    color: white;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
    flex-shrink: 0;
    margin-top: 2px;
}

.step-content h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.step-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
}

/* Advanced Section */
.advanced {
    padding: var(--space-xl) 0;
    border-top: 1px solid var(--border-primary);
}

.advanced-toggle {
    max-width: 800px;
    margin: 0 auto;
    border: 1px solid var(--border-primary);
    border-radius: 8px;
    overflow: hidden;
}

.advanced-summary {
    background: var(--bg-secondary);
    padding: var(--space-md);
    cursor: pointer;
    font-weight: 500;
    color: var(--text-primary);
    transition: var(--transition);
    user-select: none;
}

.advanced-summary:hover {
    background: var(--bg-tertiary);
}

.advanced-content {
    padding: var(--space-lg);
    background: var(--bg-primary);
    border-top: 1px solid var(--border-primary);
}

.advanced-section {
    margin-bottom: var(--space-lg);
}

.advanced-section:last-child {
    margin-bottom: 0;
}

.advanced-title {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

/* Troubleshooting Section */
.troubleshooting {
    padding: var(--space-xl) 0;
    border-top: 1px solid var(--border-primary);
}

.troubleshooting-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
    margin-bottom: var(--space-md);
}

.troubleshooting-item {
    padding: var(--space-sm);
    background: var(--bg-secondary);
    border-radius: 6px;
    margin-bottom: var(--space-sm);
    border-left: 3px solid var(--accent-purple);
}

.troubleshooting-item:last-child {
    margin-bottom: 0;
}

.troubleshooting-item strong {
    color: var(--text-primary);
    font-weight: 600;
}

.troubleshooting-item code {
    background: var(--bg-primary);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--accent-purple);
    border: 1px solid var(--border-primary);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-content {
        padding: 0 var(--space-sm);
    }
    
    .main {
        padding: 0 var(--space-sm);
    }
    
    .hero {
        padding: var(--space-xl) 0;
    }
    
    .hero-title {
        font-size: 2.25rem;
    }
    
    .demo {
        padding: var(--space-lg);
    }
    
    .command-text {
        font-size: 0.8rem;
        padding: var(--space-sm);
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }
    
    .advanced-content {
        padding: var(--space-md);
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .steps {
        gap: var(--space-md);
    }
    
    .step {
        gap: var(--space-sm);
    }
    
    .diagram {
        gap: var(--space-xs);
        padding: var(--space-md) var(--space-sm);
    }
    
    .diagram-box {
        min-width: 100px;
        padding: var(--space-sm);
    }
    
    .diagram-arrow svg {
        width: 40px;
    }
}

/* Selection styles */
::selection {
    background: var(--accent-purple);
    color: white;
}

/* Specific selection for result box */
.result-box ::selection {
    background: var(--accent-purple);
    color: var(--accent-purple-light);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-primary);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Focus styles */
:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* Copy button states */
.copy-button:active {
    transform: scale(0.95);
}

/* Subtle animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

/* Animation classes */
.hero {
    animation: fadeInUp 0.6s ease-out;
}

.demo {
    animation: fadeInUp 0.6s ease-out 0.2s both;
}

.features {
    animation: fadeInUp 0.6s ease-out 0.4s both;
}

.feature:hover .feature-icon {
    animation: pulse 1s ease-in-out;
}

.copy-button:hover {
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.15);
}

.advanced-summary:hover {
    transform: translateX(4px);
}

/* Smooth transitions */
* {
    transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}