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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #e65100 0%, #ff6f00 100%);
    min-height: 100vh;
}

header {
    background: linear-gradient(135deg, #e65100 0%, #ff6f00 100%);
    color: white;
    text-align: center;
    padding: 3rem 2rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.95;
}

.container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 2rem;
    background: white;
    border-radius: 12px;
    box-shadow: 0 8px 16px rgba(0,0,0,0.1);
}

main {
    padding: 3rem 0;
}

section {
    margin-bottom: 3rem;
}

h2 {
    color: #e65100;
    font-size: 2rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 3px solid #ff6f00;
}

h3 {
    color: #e65100;
    font-size: 1.5rem;
    margin: 2rem 0 1rem 0;
}

p {
    margin-bottom: 1rem;
    font-size: 1.1rem;
    line-height: 1.8;
}

.code-block {
    background: #1e1e1e;
    border-radius: 8px;
    padding: 1.5rem;
    margin: 1.5rem 0;
    overflow-x: auto;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.code-block pre {
    margin: 0;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.code-block code {
    color: #d4d4d4;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.95rem;
    line-height: 1.6;
    display: block;
    white-space: pre-wrap;
}

.key-points {
    list-style: none;
    padding: 0;
}

.key-points li {
    background: #fff3e0;
    margin: 0.8rem 0;
    padding: 1rem 1.5rem;
    border-left: 4px solid #ff6f00;
    border-radius: 4px;
    font-size: 1.05rem;
}

.key-points strong {
    color: #e65100;
}

.highlight-box {
    background: linear-gradient(135deg, rgba(230, 81, 0, 0.1) 0%, rgba(255, 111, 0, 0.1) 100%);
    border-left: 5px solid #ff6f00;
    padding: 2rem;
    margin: 2rem 0;
    border-radius: 8px;
}

.intro {
    background: linear-gradient(135deg, rgba(230, 81, 0, 0.05) 0%, rgba(255, 111, 0, 0.05) 100%);
    padding: 2rem;
    border-radius: 8px;
    margin-bottom: 2rem;
}

.page-nav {
    display: flex;
    justify-content: space-between;
    margin: 3rem 0;
    padding: 2rem 0;
    border-top: 2px solid #e0e0e0;
}

.page-nav a {
    background: linear-gradient(135deg, #e65100 0%, #ff6f00 100%);
    color: white;
    padding: 1rem 2rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.3s, box-shadow 0.3s;
}

.page-nav a:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(230, 81, 0, 0.3);
}

footer {
    background: #e65100;
    color: white;
    text-align: center;
    padding: 2rem;
    margin-top: 3rem;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    
    .container {
        margin: 1rem;
        padding: 0 1rem;
    }
    
    .page-nav {
        flex-direction: column;
        gap: 1rem;
    }
}