:root {
  --primary: #1a56db;
  --primary-dark: #1e3a8a;
  --accent: #10b981;
  --bg: #f8fafc;
  --surface: #ffffff;
  --text: #1e293b;
  --text-secondary: #64748b;
  --border: #e2e8f0;
  --radius: 12px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; background: var(--bg); color: var(--text); line-height: 1.6; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
.navbar { background: var(--surface); border-bottom: 1px solid var(--border); padding: 16px 0; position: sticky; top: 0; z-index: 100; }
.navbar .container { display: flex; align-items: center; justify-content: space-between; }
.logo { font-size: 1.25rem; font-weight: 700; color: var(--text); }
.nav-links a { margin-left: 24px; color: var(--text-secondary); font-weight: 500; }
.nav-links a:hover { color: var(--primary); text-decoration: none; }
.hero { background: linear-gradient(135deg, var(--primary-dark), var(--primary)); color: white; padding: 64px 0; text-align: center; }
.hero h1 { font-size: 2.5rem; margin-bottom: 8px; }
.subtitle { font-size: 1.25rem; opacity: 0.9; }
.arabic-subtitle { font-size: 1.1rem; opacity: 0.8; margin-top: 8px; }
.topics { padding: 48px 0 24px; }
.topics h2 { margin-bottom: 24px; }
.topic-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 12px; }
.topic-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; text-align: center; font-weight: 600; transition: all 0.2s; }
.topic-card:hover { border-color: var(--primary); box-shadow: 0 4px 12px rgba(26,86,219,0.15); text-decoration: none; transform: translateY(-2px); }
.course-section { padding: 32px 0; }
.course-section h2 { margin-bottom: 24px; color: var(--primary-dark); border-bottom: 2px solid var(--accent); padding-bottom: 8px; }
.course-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; }
.course-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; transition: all 0.2s; display: flex; flex-direction: column; }
.course-card:hover { border-color: var(--primary); box-shadow: 0 4px 12px rgba(26,86,219,0.1); text-decoration: none; transform: translateY(-2px); }
.course-card h3 { font-size: 1rem; margin-bottom: 8px; color: var(--text); }
.course-card .ar { font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 8px; }
.course-card .duration { font-size: 0.8rem; color: var(--text-secondary); margin-top: auto; padding-top: 12px; }
.course-detail { padding: 48px 0; }
.course-detail header { margin-bottom: 32px; }
.course-detail h1 { font-size: 2rem; margin: 12px 0; }
.arabic-title { font-size: 1.2rem; color: var(--text-secondary); }
.badge { background: var(--accent); color: white; padding: 4px 12px; border-radius: 20px; font-size: 0.8rem; font-weight: 600; }
.meta { display: flex; gap: 24px; color: var(--text-secondary); margin-top: 12px; flex-wrap: wrap; }
.content { max-width: 800px; }
.content h1 { font-size: 1.5rem; margin: 32px 0 16px; }
.content h2 { font-size: 1.25rem; margin: 28px 0 12px; color: var(--primary-dark); }
.content h3 { font-size: 1.1rem; margin: 24px 0 8px; }
.content p { margin: 12px 0; }
.content ul, .content ol { margin: 12px 0 12px 24px; }
.content li { margin: 4px 0; }
footer { background: var(--text); color: white; padding: 32px 0; text-align: center; margin-top: 48px; }
footer .ar { opacity: 0.7; font-size: 0.9rem; margin-top: 8px; }
@media (max-width: 768px) {
  .hero h1 { font-size: 1.75rem; }
  .course-grid { grid-template-columns: 1fr; }
  .topic-grid { grid-template-columns: repeat(2, 1fr); }
  .nav-links { display: none; }
}