.site-header {
  position: relative;
  z-index: 2;
  display: flex;
  min-height: 5.25rem;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: 0 max(var(--space-4), calc((100% - var(--content-width)) / 2));
  border-bottom: 1px solid var(--color-border);
  background: var(--color-light-grey);
}

.site-brand {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  color: var(--color-navy);
  text-decoration: none;
}

.site-brand img {
  width: 10rem;
  height: auto;
}

.site-navigation {
  display: flex;
  align-items: center;
  gap: clamp(0.75rem, 2vw, 1.75rem);
}

.site-navigation__link {
  padding: 0.6rem 0;
  color: var(--color-navy);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
}

.site-navigation__link[aria-current="page"] {
  color: var(--color-blue);
}

.site-navigation__cta,
.site-navigation__cta[aria-current="page"] {
  color: var(--color-white);
}

.site-navigation__cta {
  padding: 0.65rem 1.05rem;
  border-radius: 999px;
  background: var(--color-blue);
  color: var(--color-white);
}

.site-navigation__cta:hover {
  background: var(--color-navy);
  color: var(--color-white);
}

.navigation-toggle {
  display: none;
  min-height: 2.75rem;
  align-items: center;
  gap: 0.6rem;
  padding: 0.5rem 0.8rem;
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  background: var(--color-white);
  color: var(--color-navy);
  font: inherit;
  font-weight: 700;
}

.navigation-toggle__icon,
.navigation-toggle__icon::before,
.navigation-toggle__icon::after {
  display: block;
  width: 1.1rem;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
}

.navigation-toggle__icon {
  position: relative;
}

.navigation-toggle__icon::before,
.navigation-toggle__icon::after {
  position: absolute;
  left: 0;
  content: "";
}

.navigation-toggle__icon::before {
  top: -0.35rem;
}

.navigation-toggle__icon::after {
  top: 0.35rem;
}

.button {
  display: inline-flex;
  min-height: 3rem;
  align-items: center;
  justify-content: center;
  margin: 0 var(--space-1) var(--space-1) 0;
  padding: 0.75rem 1.25rem;
  border: 1px solid transparent;
  border-radius: 999px;
  font-weight: 700;
  text-align: center;
  text-decoration: none;
  transition: background-color 160ms ease, color 160ms ease, transform 160ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button--primary {
  background: var(--color-blue);
  color: var(--color-white);
}

.button--primary:hover {
  background: var(--color-navy);
  color: var(--color-white);
}

.button--secondary {
  border-color: var(--color-border);
  color: var(--color-navy);
}

.button--light {
  background: var(--color-white);
  color: var(--color-navy);
}

.course-preview-list,
.course-list {
  display: grid;
  gap: var(--space-2);
  margin: var(--space-3) 0;
  padding: 0;
  list-style: none;
}

.course-preview-list {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.course-preview-list__item,
.course-card {
  display: flex;
  flex-direction: column;
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--color-white);
  box-shadow: var(--shadow-card);
  color: var(--color-navy);
  font-weight: 700;
}

.course-preview-list__item h3 {
  margin: 0;
  font-size: 1.1rem;
  letter-spacing: -0.015em;
}

.course-card h2 {
  margin: 0;
  font-size: 1.2rem;
  letter-spacing: -0.015em;
}

.course-card__link {
  display: inline-block;
  margin-top: auto;
  padding-top: var(--space-3);
  font-size: 0.9rem;
  font-weight: 700;
}

.course-card p {
  margin: var(--space-1) 0 0;
  color: var(--color-muted);
  font-weight: 400;
}

.technology-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin: var(--space-2) 0 0;
  padding: 0;
  list-style: none;
}

.technology-list li {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--color-muted);
  font-size: 0.8rem;
  line-height: 1.25;
}

.technology-list img {
  flex: 0 0 2rem;
  width: 2rem;
  height: 2rem;
  object-fit: contain;
}

.about-loading,
.about-error {
  margin: var(--space-5) auto;
  padding: var(--space-3);
  border-radius: var(--radius-card);
  background: var(--color-light-grey);
}

.about-error {
  border-left: 4px solid var(--color-blue);
}

.about-hero {
  padding: clamp(var(--space-4), 7vw, var(--space-6));
  border-radius: 2rem;
  background: var(--color-navy);
  color: var(--color-white);
}

.about-hero .eyebrow {
  color: #a9c0ff;
}

.about-hero h1,
.about-hero p:not(.eyebrow) {
  color: var(--color-white);
}

.about-hero h1 {
  max-width: 18ch;
  font-size: clamp(2.25rem, 5vw, 4rem);
}

.about-hero__intro {
  max-width: 62ch;
  margin: var(--space-3) 0 var(--space-4);
  color: rgb(255 255 255 / 88%);
  font-size: 1.125rem;
}

.about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

.about-section {
  padding: var(--space-6) 0;
}

.about-section--muted {
  margin-inline: calc((min(100vw - 2rem, var(--content-width)) - 100vw) / 2);
  padding-inline: max(var(--space-4), calc((100vw - var(--content-width)) / 2));
  background: var(--color-light-grey);
}

.about-section__lead {
  max-width: 70ch;
  color: var(--color-muted);
  font-size: 1.125rem;
}

.about-feature-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2);
  margin: var(--space-3) 0 0;
  padding: 0;
  list-style: none;
}

.about-feature-list li,
.about-steps li {
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--color-white);
}

.about-feature-list h3,
.about-steps h3 {
  margin-bottom: var(--space-1);
  font-size: 1.1rem;
  letter-spacing: -0.015em;
}

.about-feature-list p,
.about-steps p {
  margin: 0;
  color: var(--color-muted);
  font-weight: 400;
}

.about-steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-2);
  margin: var(--space-3) 0 0;
  padding: 0;
  list-style: none;
  counter-reset: about-step;
}

.about-steps li {
  counter-increment: about-step;
}

.about-steps li::before {
  display: block;
  margin-bottom: var(--space-2);
  color: var(--color-blue);
  content: "0" counter(about-step);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.about-projects {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.about-projects p:not(.eyebrow) {
  color: var(--color-muted);
}

.about-metrics-note {
  margin-bottom: var(--space-5);
  padding: var(--space-3);
  border-left: 4px solid var(--color-blue);
  border-radius: 0 var(--radius-card) var(--radius-card) 0;
  background: var(--color-light-grey);
}

.about-metrics-note h2 {
  margin-bottom: var(--space-1);
  font-size: 1.1rem;
  letter-spacing: -0.015em;
}

.about-metrics-note p {
  margin: 0;
  color: var(--color-muted);
}

.about-closing {
  padding: var(--space-5);
  border-radius: 2rem;
  background: var(--color-navy);
  color: var(--color-white);
}

.about-closing h2,
.about-closing p:not(.eyebrow) {
  color: var(--color-white);
}

.about-closing .eyebrow {
  color: #a9c0ff;
}

.text-link {
  display: inline-block;
  margin-top: var(--space-1);
  font-weight: 700;
}

.contact-options {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-2);
  margin: var(--space-3) 0 var(--space-4);
  padding: 0;
  list-style: none;
}

.contact-option {
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--color-white);
  box-shadow: var(--shadow-card);
}

.contact-option h3 {
  margin-bottom: var(--space-1);
  font-size: 1.1rem;
}

.contact-option p {
  margin: 0;
  color: var(--color-muted);
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-4) max(var(--space-4), calc((100% - var(--content-width)) / 2));
  background: var(--color-navy);
  color: var(--color-white);
}

.site-footer__copyright {
  margin: 0;
}

.site-footer__navigation {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.site-footer__navigation a {
  color: var(--color-white);
  text-decoration: none;
}

.site-footer__navigation a:hover {
  text-decoration: underline;
}