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

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  color: var(--color-ink);
  background: var(--color-bg);
  line-height: 1.5;
}

a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }

.promo-bar {
  background: var(--color-promo-bg);
  color: var(--color-promo-text);
  text-align: center;
  font-size: 0.85rem;
  padding: 8px 12px;
  letter-spacing: 0.02em;
}

/* Header */
.site-header {
  background: var(--color-header-bg);
  position: sticky;
  top: 0;
  z-index: 50;
}
.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.header-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: 0.02em;
  color: var(--color-header-text);
}
.logo-mark { color: var(--color-accent); font-size: 1.4rem; }
.header-nav { display: flex; gap: 22px; flex-wrap: wrap; }
.nav-link {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--color-header-text);
  opacity: 0.85;
}
.nav-link:hover { opacity: 1; color: var(--color-accent); }
.btn-enroll {
  background: var(--color-accent);
  color: #fff;
  padding: 9px 18px;
  border-radius: 4px;
  font-weight: 700;
  font-size: 0.88rem;
  white-space: nowrap;
}

/* Hero */
.hero { background: var(--color-surface); }
.hero-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 60px 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}
.hero-copy h1 {
  font-size: 2.3rem;
  line-height: 1.15;
  margin-bottom: 16px;
  color: var(--color-primary);
}
.hero-copy p {
  color: var(--color-ink-soft);
  margin-bottom: 24px;
  max-width: 42ch;
}
.btn-primary {
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  padding: 12px 28px;
  border-radius: 4px;
  font-weight: 700;
  font-size: 0.95rem;
}
.btn-primary:hover { background: var(--color-primary-dark); }
.hero-media img { border-radius: 8px; }

/* Section titles */
.section-title {
  max-width: 1200px;
  margin: 0 auto;
  padding: 48px 24px 24px;
  font-size: 1.5rem;
  color: var(--color-primary);
  text-align: center;
}

/* Course grid */
.course-grid {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 48px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.course-card {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
}
.course-card img { height: 170px; width: 100%; object-fit: cover; }
.course-body { padding: 18px; }
.course-body h3 { font-size: 1.08rem; margin-bottom: 8px; color: var(--color-primary); }
.course-body p { font-size: 0.9rem; color: var(--color-ink-soft); margin-bottom: 10px; }
.course-meta { font-size: 0.8rem; color: var(--color-accent); font-weight: 700; }

/* Instructors */
.instructors-section { background: var(--color-surface); }
.instructor-grid {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 48px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.instructor-card {
  background: #fff;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  text-align: center;
  padding-bottom: 20px;
}
.instructor-card img { height: 220px; width: 100%; object-fit: cover; margin-bottom: 14px; }
.instructor-card h3 { font-size: 1.05rem; margin-bottom: 8px; color: var(--color-primary); padding: 0 16px; }
.instructor-card p { font-size: 0.88rem; color: var(--color-ink-soft); padding: 0 16px; }

/* CTA section */
.cta-section {
  background: var(--color-primary);
  color: #fff;
  text-align: center;
  padding: 56px 24px;
}
.cta-inner { max-width: 600px; margin: 0 auto; }
.cta-section h2 { font-size: 1.7rem; margin-bottom: 12px; }
.cta-section p { margin-bottom: 22px; opacity: 0.9; }
.cta-section .btn-primary { background: var(--color-accent); }
.cta-section .btn-primary:hover { background: #0b8a9a; }

/* Footer */
.site-footer { background: var(--color-footer-bg); color: var(--color-footer-text); }
.footer-nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 48px 24px 24px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 32px;
}
.footer-logo { font-weight: 700; font-size: 1.05rem; color: #fff; display: block; margin-bottom: 10px; }
.footer-col h4 { color: #fff; font-size: 0.9rem; margin-bottom: 12px; }
.footer-col a { display: block; font-size: 0.85rem; padding: 4px 0; color: var(--color-footer-text); }
.footer-bottom {
  text-align: center;
  padding: 16px;
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 0.8rem;
}
.footer-inner { max-width: 900px; margin: 0 auto; padding: 24px; text-align: center; }

/* Generic inner page content */
.page-content {
  max-width: 900px;
  margin: 0 auto;
  padding: 56px 24px 80px;
}
.page-content h1 { font-size: 2rem; margin-bottom: 20px; color: var(--color-primary); }
.page-content h2 { font-size: 1.3rem; margin: 28px 0 12px; color: var(--color-primary); }
.page-content p { color: var(--color-ink-soft); margin-bottom: 14px; }

@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; }
  .course-grid { grid-template-columns: 1fr; }
  .instructor-grid { grid-template-columns: 1fr; }
  .footer-nav-inner { grid-template-columns: 1fr 1fr; }
}