/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-bg: #ffffff;
    --color-surface: #f8f9fa;
    --color-border: #e1e4e8;
    --color-text-primary: #24292e;
    --color-text-secondary: #586069;
    --color-text-muted: #6a737d;
    --color-accent: #0366d6;
    --color-accent-hover: #0256c7;
    --color-code-bg: #f6f8fa;
    --max-width: 1080px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--color-text-primary);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Header */
.header {
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--color-border);
}

.logo {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

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

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

.hero-headline {
    font-size: 2.5rem;
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.hero-subtext {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    max-width: 720px;
    margin-left: auto;
    margin-right: auto;
}

.hero-ctas {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s ease;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: var(--color-accent);
    color: white;
}

.btn-primary:hover {
    background: var(--color-accent-hover);
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background: #e9ecef;
}

.btn-link {
    background: none;
    color: var(--color-accent);
    border: none;
    padding: 0;
    font-size: 1rem;
    cursor: pointer;
    text-decoration: underline;
}

.btn-link:hover {
    color: var(--color-accent-hover);
}

/* Toggle Section */
.toggle-section {
    padding: var(--spacing-md) 0;
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.tabs {
    display: flex;
    gap: var(--spacing-xs);
    justify-content: center;
}

.tab {
    padding: 0.5rem 1.5rem;
    background: white;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.tab:hover {
    background: var(--color-surface);
}

.tab.active {
    background: var(--color-accent);
    color: white;
    border-color: var(--color-accent);
}

/* Explanation Panel */
.explanation-panel {
    padding: var(--spacing-xl) 0;
}

.view-content {
    display: none;
}

.view-content.active {
    display: block;
}

.explanation-panel h2 {
    font-size: 2rem;
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

/* Human View */
.explanation-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-lg);
}

.explanation-item h3 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.explanation-item p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

.explanation-item ul {
    list-style: none;
    padding-left: 0;
}

.explanation-item li {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
    padding-left: 1.25rem;
    position: relative;
}

.explanation-item li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--color-accent);
}

/* Agent View */
.agent-content {
    max-width: 720px;
    margin: 0 auto;
}

.json-example {
    background: var(--color-code-bg);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: var(--spacing-md);
    overflow-x: auto;
    margin-bottom: var(--spacing-md);
}

.json-example code {
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--color-text-primary);
    white-space: pre;
    display: block;
}

.agent-caption {
    text-align: center;
    color: var(--color-text-muted);
    font-style: italic;
}

/* Skills Preview Section */
.skills-preview {
    padding: var(--spacing-xl) 0;
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.skills-preview h2 {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.skills-intro {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

.skills-explanation {
    font-size: 1rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-lg);
}

.skills-examples {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    max-width: 960px;
    margin-left: auto;
    margin-right: auto;
}

.skill-card {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: var(--spacing-md);
    text-align: left;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.skill-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.skill-card h3 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-accent);
    font-family: 'Monaco', 'Menlo', monospace;
}

.skill-card p {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

/* Footer */
.footer {
    padding: var(--spacing-lg) 0;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer-links {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    color: var(--color-accent);
    text-decoration: none;
}

.footer-links a:hover {
    text-decoration: underline;
}

.separator {
    color: var(--color-border);
}

.footer-note {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    font-style: italic;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-headline {
        font-size: 1.75rem;
    }

    .hero-subtext {
        font-size: 1rem;
    }

    .explanation-grid {
        grid-template-columns: 1fr;
    }

    .skills-examples {
        grid-template-columns: 1fr;
    }

    .hero-ctas {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}