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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.8;
    color: #333;
    background: #f8f9fa;
}

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

/* Navigation */
nav {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
}

.back-link {
    text-decoration: none;
    color: #667eea;
    font-weight: 500;
    transition: color 0.3s;
}

.back-link:hover {
    color: #764ba2;
}

/* Header */
.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 120px 0 60px;
    text-align: center;
}

.header h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* Content */
.content {
    background: white;
    margin: -40px auto 60px;
    padding: 60px;
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.content h2 {
    color: #667eea;
    font-size: 1.8rem;
    margin: 2.5rem 0 1rem;
}

.content h2:first-child {
    margin-top: 0;
}

.content h3 {
    color: #333;
    font-size: 1.3rem;
    margin: 2rem 0 1rem;
}

.content p {
    margin-bottom: 1rem;
    color: #555;
}

.content ul, .content ol {
    margin: 1rem 0 1rem 2rem;
    color: #555;
}

.content li {
    margin-bottom: 0.5rem;
}

.content strong {
    color: #333;
}

.highlight-box {
    background: #f0f4ff;
    border-left: 4px solid #667eea;
    padding: 1.5rem;
    margin: 2rem 0;
    border-radius: 8px;
}

.date {
    color: #999;
    font-style: italic;
    margin-bottom: 2rem;
    display: block;
}

/* Footer */
footer {
    background: #2d3748;
    color: white;
    padding: 2rem 0;
    text-align: center;
}

footer p {
    opacity: 0.8;
}

/* Responsive */
@media (max-width: 768px) {
    .header h1 {
        font-size: 2rem;
    }

    .content {
        padding: 30px 20px;
        margin: -20px 20px 40px;
    }

    .content h2 {
        font-size: 1.5rem;
    }
}