:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --dark-blue: #1e293b;
    --slate: #64748b;
    --light-gray: #f8fafc;
    --white: #ffffff;
    --border-color: #e2e8f0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    color: var(--dark-blue);
    background-color: var(--white);
    line-height: 1.7;
}

.container { max-width: 750px; margin: 0 auto; padding: 0 20px; }

/* Navbar */
.navbar { background: rgba(255, 255, 255, 0.7); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border-color); padding: 1rem 0; position: sticky; top: 0; z-index: 1000; }
.navbar .container { max-width: 1100px; display: flex; justify-content: space-between; align-items: center; }
.logo { font-size: 1.5rem; font-weight: 700; text-decoration: none; color: var(--primary-color); }
.nav-link { text-decoration: none; color: var(--slate); font-weight: 500; transition: color 0.2s; }
.nav-link:hover { color: var(--primary-color); }

/* Buttons */
.button { text-decoration: none; padding: 0.6rem 1.2rem; border-radius: 8px; font-weight: 600; transition: all 0.2s; display: inline-block; text-align: center; }
.button-primary { background-color: var(--primary-color); color: var(--white); }
.button-large { font-size: 1.1rem; padding: 0.8rem 2rem; }
.button:hover { transform: translateY(-2px); box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3); }

/* Article Content */
.article-header {
    background-color: var(--light-gray);
    padding: 4rem 0;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}
.article-header h1 {
    font-size: 3rem;
    color: var(--dark-blue);
    margin-top: 0;
    margin-bottom: 1rem;
    line-height: 1.2;
}
.article-header .subtitle {
    font-size: 1.2rem;
    color: var(--slate);
    margin-bottom: 2rem;
}

.article-content {
    padding: 3rem 0;
}
.article-content p, .article-content li {
    font-size: 1.1rem;
    color: var(--dark-blue);
    margin-bottom: 1.5rem;
}
.article-content h2 {
    font-size: 2rem;
    margin-top: 3rem;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 0.5rem;
}
.article-content h3 {
    font-size: 1.5rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
}
.article-content ul, .article-content ol {
    padding-left: 25px;
}
.article-content strong {
    color: var(--dark-blue);
}
.article-content .cta-section {
    background-color: var(--light-gray);
    padding: 2.5rem;
    border-radius: 12px;
    text-align: center;
    margin-top: 3rem;
}
.article-content .cta-section h2 {
    border-bottom: none;
    margin-top: 0;
}

/* Footer */
.footer { padding: 3rem 0; text-align: center; background: var(--dark-blue); color: var(--light-gray); }
.footer p { margin: 0; font-size: 0.9rem; }