/* Zebra Programming Book - Main Stylesheet */

:root {
    --primary: #0284c7;
    --success: #16a34a;
    --warning: #d97706;
    --error: #dc2626;
    --bg-light: #f9fafb;
    --bg-dark: #1f2937;
    --text-light: #374151;
    --text-dark: #f3f4f6;
    --border: #e5e7eb;
    --code-bg: #f3f4f6;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-light);
    background: white;
}

/* Layout */
.container {
    display: grid;
    grid-template-columns: 280px 1fr;
    min-height: 100vh;
}

.sidebar {
    background: var(--bg-light);
    border-right: 1px solid var(--border);
    padding: 2rem 1.5rem;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
}

.content {
    padding: 3rem;
    max-width: 900px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    margin: 1.5rem 0 0.75rem 0;
    font-weight: 600;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
    margin: 1rem 0;
}

code {
    background: var(--code-bg);
    padding: 0.2em 0.4em;
    border-radius: 3px;
    font-family: 'Monaco', monospace;
    font-size: 0.9em;
}

pre {
    background: var(--bg-dark);
    color: var(--text-dark);
    padding: 1rem;
    border-radius: 6px;
    overflow-x: auto;
    margin: 1rem 0;
}

pre code {
    background: none;
    padding: 0;
    color: inherit;
}

/* Links */
a {
    color: var(--primary);
    text-decoration: none;
    transition: opacity 0.2s;
}

a:hover {
    opacity: 0.7;
    text-decoration: underline;
}

/* Images */
figure {
    margin: 2rem 0;
    text-align: center;
}

figure img {
    max-width: 100%;
    height: auto;
    border-radius: 6px;
    border: 1px solid var(--border);
}

figcaption {
    margin-top: 0.5rem;
    font-size: 0.9em;
    color: #6b7280;
}

/* Navigation */
.sidebar-nav {
    margin: 2rem 0;
}

.sidebar-nav ul {
    list-style: none;
}

.sidebar-nav a {
    display: block;
    padding: 0.5rem 0;
    font-size: 0.95em;
}

.sidebar-nav a:hover {
    color: var(--primary);
}

/* Search */
.sidebar-search {
    margin-top: 2rem;
}

#search-box {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 0.9em;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s;
}

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

.btn-primary:hover {
    opacity: 0.8;
}

.btn-secondary {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

/* Index page */
.index-page .hero {
    background: linear-gradient(135deg, var(--primary), #0369a1);
    color: white;
    padding: 6rem 2rem;
    text-align: center;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
}

.tagline {
    font-size: 1.3em;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Features */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    padding: 4rem 2rem;
    background: var(--bg-light);
}

.feature {
    padding: 2rem;
    background: white;
    border-radius: 8px;
    border: 1px solid var(--border);
}

.feature h3 {
    margin-top: 0;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        grid-template-columns: 1fr;
    }

    .sidebar {
        border-bottom: 1px solid var(--border);
        position: static;
        height: auto;
    }

    .content {
        padding: 1.5rem;
    }

    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.5rem; }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    body {
        background: var(--bg-dark);
        color: var(--text-dark);
    }

    .sidebar {
        background: #111827;
        border-color: #374151;
    }

    .content {
        background: var(--bg-dark);
        color: var(--text-dark);
    }

    code {
        background: #374151;
    }

    pre {
        background: #0f172a;
    }
}