:root {
  --ocs-sidebar-width: 320px;
  --ocs-border: rgba(0, 0, 0, 0.08);
}

.ocs-layout {
  display: flex;
  min-height: 100vh;
}

.ocs-sidebar {
  width: var(--ocs-sidebar-width);
  flex: 0 0 var(--ocs-sidebar-width);
  border-right: 1px solid var(--ocs-border);
  padding: 1.25rem 1rem;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
  background: #fff;
}

.ocs-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.ocs-brand img {
  border-radius: 999px;
}

.ocs-course-title {
  margin: 0;
  font-size: 1.1rem;
  line-height: 1.2;
}

.ocs-course-subtitle {
  margin: 0.25rem 0 0;
  color: #6c757d;
  font-size: 0.95rem;
}

.ocs-nav {
  margin-top: 1rem;
}

.ocs-nav a {
  display: block;
  padding: 0.55rem 0.65rem;
  border-radius: 0.6rem;
  color: #212529;
  text-decoration: none;
  border: 1px solid transparent;
}

.ocs-nav a:hover {
  background: rgba(0, 99, 178, 0.07);
}

.ocs-nav a[aria-current="page"] {
  background: rgba(0, 99, 178, 0.12);
  border-color: rgba(0, 99, 178, 0.25);
  font-weight: 700;
}

.ocs-nav small {
  color: #6c757d;
  font-weight: 700;
  display: block;
  margin-top: 1.25rem;
  margin-bottom: 0.5rem;
  letter-spacing: 0.02em;
}

.ocs-main {
  flex: 1 1 auto;
  padding: 0;
}

.ocs-hero {
  padding: 2.25rem 1.5rem 2rem;
  background: linear-gradient(180deg, rgba(0, 99, 178, 0.16), rgba(0, 99, 178, 0));
  border-bottom: 1px solid var(--ocs-border);
}

.ocs-hero h1 {
  margin: 0;
}

.ocs-hero p {
  margin: 0.75rem 0 0;
  max-width: 72ch;
}

.ocs-content {
  padding: 1.5rem;
}

.ocs-content h2 {
  margin-top: 2rem;
}

.ocs-callout {
  border: 1px solid var(--ocs-border);
  border-left: 6px solid #0063b2;
  border-radius: 0.75rem;
  padding: 1rem;
  background: rgba(0, 99, 178, 0.03);
}

.ocs-steps {
  border: 1px solid var(--ocs-border);
  border-radius: 0.75rem;
  padding: 1rem;
}

.ocs-next {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--ocs-border);
}

@media (max-width: 991.98px) {
  .ocs-layout {
    display: block;
  }

  .ocs-sidebar {
    position: relative;
    width: 100%;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--ocs-border);
  }
}