/* Modern DevOps Theme for Lab 4 */
:root {
    --primary: #0070f3;
    --primary-dark: #0761d1;
    --secondary: #000000;
    --accent: #50e3c2;
    --bg-body: #fafafa;
    --bg-card: #ffffff;
    --text-main: #333333;
    --text-muted: #666666;
    --border: #eaeaea;
    --code-bg: #111111;
    --code-text: #f8f8f2;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --font-main: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    --font-mono: 'SF Mono', 'Roboto Mono', Menlo, monospace;
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-body);
    color: var(--text-main);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
header {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 0 2rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.02);
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--secondary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo span {
    color: var(--primary);
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 500;
    transition: color 0.2s;
    font-size: 0.95rem;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--primary);
}

/* Main Content */
main {
    flex: 1;
    max-width: 1000px;
    width: 100%;
    margin: 0 auto;
    padding: 3rem 2rem;
}

.hero {
    text-align: center;
    margin-bottom: 4rem;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -0.05rem;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--secondary), var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto;
}

/* Cards */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem;
    transition: transform 0.2s, box-shadow 0.2s;
    height: 100%;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow);
    border-color: var(--primary);
}

.card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--secondary);
}

.card-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    display: block;
}

/* Typography for Content */
article h2 {
    font-size: 2rem;
    margin: 2rem 0 1rem;
    color: var(--secondary);
}

article h3 {
    font-size: 1.5rem;
    margin: 1.5rem 0 1rem;
    color: var(--text-main);
}

article p, article li {
    margin-bottom: 1rem;
    color: var(--text-main);
}

article ul, article ol {
    padding-left: 1.5rem;
}

/* Code Blocks */
pre {
    background: var(--code-bg);
    color: var(--code-text);
    padding: 1.5rem;
    border-radius: 8px;
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    margin: 1.5rem 0;
    position: relative;
    border: 1px solid #333;
}

code {
    font-family: var(--font-mono);
    background: rgba(0,0,0,0.05);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-size: 0.9em;
    color: var(--primary-dark);
}

pre code {
    background: transparent;
    color: inherit;
    padding: 0;
}

.copy-btn {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    background: rgba(255,255,255,0.1);
    border: none;
    color: #fff;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: background 0.2s;
}

.copy-btn:hover {
    background: rgba(255,255,255,0.2);
}

/* Steps */
.step {
    border-left: 3px solid var(--border);
    padding-left: 1.5rem;
    margin-bottom: 2rem;
    position: relative;
}

.step.active {
    border-color: var(--primary);
}

.step-number {
    position: absolute;
    left: -2.35rem;
    top: 0;
    width: 2rem;
    height: 2rem;
    background: var(--bg-body);
    border: 2px solid var(--border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    color: var(--text-muted);
}

.step.active .step-number {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--bg-card);
}

/* Footer */
footer {
    background: var(--bg-card);
    border-top: 1px solid var(--border);
    padding: 2rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: auto;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    nav {
        flex-direction: column;
        height: auto;
        padding: 1rem;
    }
    
    .nav-links {
        margin-top: 1rem;
        gap: 1rem;
        flex-wrap: wrap;
        justify-content: center;
    }
}