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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 60px 20px;
    text-align: center;
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
    font-weight: 600;
}

.tagline {
    font-size: 1.2em;
    margin-bottom: 30px;
    opacity: 0.95;
}

.links {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn-primary {
    background-color: white;
    color: #667eea;
}

.btn-primary:hover {
    background-color: #f0f0f0;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.btn-secondary {
    background-color: rgba(255,255,255,0.2);
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background-color: rgba(255,255,255,0.3);
    transform: translateY(-2px);
}

/* Main Content */
main {
    background-color: white;
    padding: 40px 20px;
    margin: 40px auto;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

section {
    margin-bottom: 50px;
}

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

h2 {
    color: #667eea;
    font-size: 2em;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 3px solid #667eea;
}

h3 {
    color: #764ba2;
    font-size: 1.4em;
    margin-top: 25px;
    margin-bottom: 15px;
}

p {
    margin-bottom: 15px;
}

ul, ol {
    margin-left: 30px;
    margin-bottom: 15px;
}

li {
    margin-bottom: 8px;
}

ul ul, ol ul {
    margin-top: 8px;
}

a {
    color: #667eea;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

code {
    background-color: #f4f4f4;
    padding: 2px 6px;
    border-radius: 3px;
    font-family: "Monaco", "Menlo", "Ubuntu Mono", monospace;
    font-size: 0.9em;
    color: #e83e8c;
}

pre {
    background-color: #2d2d2d;
    color: #f8f8f2;
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
    margin-bottom: 20px;
}

pre code {
    background-color: transparent;
    padding: 0;
    color: #f8f8f2;
    font-size: 0.95em;
}

.note {
    background-color: #e7f3ff;
    border-left: 4px solid #2196F3;
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 4px;
}

.warning {
    background-color: #fff3cd;
    border-left: 4px solid #ffc107;
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 4px;
}

.note strong, .warning strong {
    color: inherit;
}

/* Footer */
footer {
    background-color: #2d2d2d;
    color: white;
    text-align: center;
    padding: 30px 20px;
}

footer p {
    margin-bottom: 10px;
}

footer a {
    color: #667eea;
}

footer a:hover {
    color: #764ba2;
}

/* Responsive */
@media (max-width: 768px) {
    header h1 {
        font-size: 2em;
    }
    
    .tagline {
        font-size: 1em;
    }
    
    h2 {
        font-size: 1.6em;
    }
    
    h3 {
        font-size: 1.2em;
    }
    
    main {
        margin: 20px auto;
        padding: 30px 15px;
    }
}