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

:root {
    --primary: #2563eb;
    --primary-dark: #1e40af;
    --secondary: #10b981;
    --accent: #f59e0b;
    --bg: #ffffff;
    --bg-secondary: #f9fafb;
    --text: #1f2937;
    --text-light: #6b7280;
    --border: #e5e7eb;
    --code-bg: #f3f4f6;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.7;
    color: var(--text);
    background: var(--bg);
}

header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 3rem 1rem;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

header p {
    font-size: 1.1rem;
    opacity: 0.95;
    max-width: 800px;
    margin: 0 auto;
}

.meta {
    margin-top: 1rem;
    font-size: 0.9rem;
    opacity: 0.9;
}

nav {
    background: var(--bg-secondary);
    padding: 1rem;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

nav a {
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

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

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

h2 {
    font-size: 2rem;
    margin: 3rem 0 1rem;
    color: var(--primary);
    border-bottom: 3px solid var(--primary);
    padding-bottom: 0.5rem;
}

h3 {
    font-size: 1.5rem;
    margin: 2rem 0 1rem;
    color: var(--primary-dark);
}

h4 {
    font-size: 1.2rem;
    margin: 1.5rem 0 0.75rem;
    color: var(--text);
}

p {
    margin-bottom: 1rem;
}

a {
    color: var(--primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

ul, ol {
    margin: 1rem 0 1rem 2rem;
}

li {
    margin-bottom: 0.5rem;
}

.info-box {
    background: var(--bg-secondary);
    border-left: 4px solid var(--primary);
    padding: 1.5rem;
    margin: 1.5rem 0;
    border-radius: 4px;
}

.success-box {
    background: #ecfdf5;
    border-left: 4px solid var(--secondary);
    padding: 1.5rem;
    margin: 1.5rem 0;
    border-radius: 4px;
}

.warning-box {
    background: #fffbeb;
    border-left: 4px solid var(--accent);
    padding: 1.5rem;
    margin: 1.5rem 0;
    border-radius: 4px;
}

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

pre {
    background: #1f2937;
    color: #f9fafb;
    padding: 1.5rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1.5rem 0;
}

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

.card {
    background: white;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    margin: 1.5rem 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.card h3 {
    margin-top: 0;
}

.faq-item {
    margin-bottom: 1.5rem;
}

.faq-item h4 {
    color: var(--primary);
}

.cta {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 2rem;
    border-radius: 8px;
    text-align: center;
    margin: 3rem 0;
}

.cta h2, .cta h3 {
    color: white;
    border: none;
    margin-top: 0;
}

footer {
    background: var(--bg-secondary);
    padding: 2rem 1rem;
    text-align: center;
    margin-top: 4rem;
    border-top: 1px solid var(--border);
}

#progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 4px;
    background: var(--accent);
    z-index: 1000;
    transition: width 0.1s;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 1.8rem;
    }
    
    h2 {
        font-size: 1.6rem;
    }
    
    nav ul {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
    }
    
    .container {
        padding: 1rem;
    }
}

html {
    scroll-behavior: smooth;
}