* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Segoe UI', Arial, sans-serif; line-height: 1.6; }
a { text-decoration: none; }
img { max-width: 100%; display: block; }

.top-bar { display: flex; justify-content: space-between; padding: 8px 24px; font-size: 13px; font-weight: 700; flex-wrap: wrap; gap: 10px; }

.header-inner { max-width: 1200px; margin: 0 auto; padding: 16px 24px; display: flex; justify-content: space-between; align-items: center; gap: 20px; }
.header-logo { font-size: 21px; font-weight: 800; letter-spacing: 1px; }
.header-nav { display: flex; gap: 26px; flex: 1; justify-content: center; }
.nav-link { font-size: 14px; font-weight: 600; }
.btn-enroll { padding: 10px 20px; border-radius: 4px; font-weight: 700; font-size: 14px; }

.hero { padding: 90px 24px; text-align: center; }
.hero-inner { max-width: 720px; margin: 0 auto; }
.hero-title { font-size: 40px; font-weight: 800; margin-bottom: 18px; }
.hero-sub { font-size: 17px; margin-bottom: 30px; }
.btn-primary { display: inline-block; padding: 14px 30px; font-weight: 700; border-radius: 4px; }

.section-title { max-width: 1200px; margin: 0 auto; padding: 60px 24px 30px; font-size: 28px; font-weight: 800; text-align: center; }

.course-grid { max-width: 1200px; margin: 0 auto; padding: 0 24px 60px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.course-card { padding: 28px; border-radius: 6px; }
.course-level { font-size: 12px; font-weight: 800; text-transform: uppercase; letter-spacing: 1px; }
.course-card h3 { font-size: 19px; margin: 10px 0 12px; }
.course-card p { font-size: 14px; }

.instructor-section { padding-bottom: 60px; }
.instructor-grid { max-width: 1200px; margin: 0 auto; padding: 0 24px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.instructor-card img { width: 100%; height: 200px; object-fit: cover; border-radius: 6px; margin-bottom: 14px; }
.instructor-card h3 { font-size: 17px; margin-bottom: 6px; }
.instructor-card p { font-size: 13px; }

.testimonial-grid { max-width: 900px; margin: 0 auto; padding: 0 24px 70px; display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.testimonial-card { padding: 24px; border-radius: 4px; font-size: 15px; font-style: italic; }
.testimonial-name { display: block; margin-top: 14px; font-weight: 700; font-style: normal; font-size: 14px; }

.cta-section { text-align: center; padding: 70px 24px; }
.cta-section h2 { font-size: 28px; margin-bottom: 24px; }

.site-footer { padding: 50px 24px 20px; }
.footer-nav-inner { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 30px; }
.footer-col { display: flex; flex-direction: column; gap: 10px; }
.footer-col h4 { font-size: 14px; font-weight: 800; margin-bottom: 6px; color: #fff; }
.footer-col p { font-size: 13px; }
.footer-col a { font-size: 13px; }
.footer-bottom { max-width: 1200px; margin: 30px auto 0; padding-top: 20px; font-size: 12px; text-align: center; }
.footer-inner { max-width: 900px; margin: 0 auto; padding: 24px; text-align: center; }

.static-page { max-width: 760px; margin: 0 auto; padding: 60px 24px 80px; }
.static-title { font-size: 34px; font-weight: 800; margin-bottom: 24px; }
.static-page p { font-size: 16px; margin-bottom: 18px; }
.contact-block { margin-top: 20px; }
.contact-block p { margin-bottom: 8px; }

.blog-list-page { max-width: 1200px; margin: 0 auto; padding: 50px 24px 20px; }
.category-intro { font-size: 15px; margin-bottom: 30px; max-width: 640px; }

@media (max-width: 900px) {
  .course-grid, .instructor-grid, .testimonial-grid { grid-template-columns: 1fr; }
  .header-nav { display: none; }
  .footer-nav-inner { grid-template-columns: 1fr 1fr; }
  .hero-title { font-size: 28px; }
}