body {
  background-color: var(--bg-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

.course-main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 15px 20px;
  animation: slideUp 0.7s cubic-bezier(0.16, 1, 0.3, 1);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.course-header-section {
  text-align: center;
  margin: 20px 0 30px;
  animation: fadeDown 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.page-title {
  font-size: 1.8rem;
  font-weight: 900;
  margin-bottom: 8px;
  background: linear-gradient(135deg, var(--text-primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.page-subtitle {
  color: var(--text-secondary);
  font-size: 0.95rem;
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.4;
}

.course-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  width: 100%;
}

.course-rect {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 15px 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  text-decoration: none;
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 15px -5px rgba(0, 0, 0, 0.05);
  cursor: pointer;
  min-height: 110px;
  justify-content: center;
}

.course-rect::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--accent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.course-rect:hover {
  transform: translateY(-8px) scale(1.02);
  border-color: var(--accent);
  box-shadow: 0 12px 30px -10px rgba(0, 0, 0, 0.1);
}

.course-rect:hover::before {
  opacity: 1;
}

.course-code {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 4px 12px;
  border-radius: 8px;
  width: fit-content;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.course-name {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.4;
  text-transform: uppercase;
}

body.dark .course-rect {
  box-shadow: 0 4px 20px -5px rgba(0, 0, 0, 0.3);
}

body.dark .course-rect:hover {
  box-shadow: 0 12px 30px -10px rgba(0, 0, 0, 0.5);
}

@media (max-width: 640px) {
  .page-title {
    font-size: 1.5rem;
  }
  .course-name {
    font-size: 1rem;
  }
  .course-rect {
    padding: 12px 10px;
    min-height: 90px;
  }
}