:root {
  color-scheme: light;
  --course-ink: #102a43;
  --course-muted: #486581;
  --course-brand: #0f766e;
  --course-brand-dark: #115e59;
  --course-surface: #f4f8f7;
  --course-border: #d9e7e4;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--course-ink);
  background: #ffffff;
  line-height: 1.65;
}

a {
  color: inherit;
}

.course-page {
  min-height: 100vh;
}

.course-header {
  border-bottom: 1px solid rgba(217, 231, 228, 0.85);
  background: #ffffff;
}

.course-header-inner,
.course-container {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
}

.course-header-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.course-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--course-ink);
  text-decoration: none;
  font-weight: 750;
  letter-spacing: -0.01em;
}

.course-brand img {
  width: 42px;
  height: 42px;
  object-fit: contain;
}

.course-brand span {
  font-size: clamp(1rem, 2vw, 1.15rem);
}

.course-header nav {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.9rem;
  font-weight: 650;
}

.course-header nav a {
  text-decoration: none;
}

.course-header nav a:hover,
.course-header nav a:focus-visible {
  color: var(--course-brand);
}

.course-header .course-cta,
.course-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 0.65rem 1rem;
  color: #ffffff;
  background: var(--course-brand);
  text-decoration: none;
  font-weight: 750;
  box-shadow: 0 7px 18px rgba(15, 118, 110, 0.2);
}

.course-header .course-cta:hover,
.course-header .course-cta:focus-visible,
.course-cta:hover,
.course-cta:focus-visible {
  background: var(--course-brand-dark);
}

.course-hero {
  padding: clamp(3.5rem, 8vw, 6.5rem) 0 4rem;
  background:
    radial-gradient(circle at 90% 10%, rgba(13, 148, 136, 0.15), transparent 30rem),
    linear-gradient(135deg, #f3fbf8 0%, #ffffff 65%);
}

.course-eyebrow {
  margin: 0 0 0.75rem;
  color: var(--course-brand-dark);
  text-transform: uppercase;
  letter-spacing: 0.11em;
  font-size: 0.78rem;
  font-weight: 800;
}

.course-hero h1 {
  max-width: 820px;
  margin: 0;
  color: var(--course-ink);
  font-size: clamp(2.25rem, 5vw, 4.25rem);
  line-height: 1.08;
  letter-spacing: -0.045em;
}

.course-lead {
  max-width: 760px;
  margin: 1.35rem 0 0;
  color: var(--course-muted);
  font-size: clamp(1.05rem, 2vw, 1.3rem);
}

.course-hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.85rem;
  margin-top: 2rem;
}

.course-secondary-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 0.85rem;
  color: var(--course-brand-dark);
  font-weight: 750;
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.course-breadcrumb {
  padding: 1rem 0;
  color: var(--course-muted);
  font-size: 0.88rem;
}

.course-breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.course-breadcrumb li + li::before {
  content: "/";
  margin-right: 0.4rem;
  color: #829ab1;
}

.course-breadcrumb a {
  color: var(--course-brand-dark);
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

.course-section {
  padding: clamp(3rem, 7vw, 5rem) 0;
}

.course-section.alt {
  background: var(--course-surface);
}

.course-section h2 {
  max-width: 760px;
  margin: 0;
  color: var(--course-ink);
  font-size: clamp(1.75rem, 3vw, 2.55rem);
  line-height: 1.16;
  letter-spacing: -0.025em;
}

.course-section-intro {
  max-width: 720px;
  margin: 1rem 0 0;
  color: var(--course-muted);
}

.course-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.course-card {
  height: 100%;
  padding: 1.35rem;
  border: 1px solid var(--course-border);
  border-radius: 1rem;
  background: #ffffff;
  box-shadow: 0 10px 26px rgba(16, 42, 67, 0.06);
}

.course-card h3 {
  margin: 0;
  font-size: 1.2rem;
  line-height: 1.25;
}

.course-card p {
  margin: 0.7rem 0 0;
  color: var(--course-muted);
}

.course-card .course-meta {
  display: inline-flex;
  margin-top: 1rem;
  padding: 0.3rem 0.6rem;
  border-radius: 999px;
  background: #e5f5f0;
  color: var(--course-brand-dark);
  font-size: 0.78rem;
  font-weight: 750;
}

.course-columns {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 2rem;
  align-items: start;
  margin-top: 2rem;
}

.course-columns h3 {
  margin: 0;
  font-size: 1.2rem;
}

.course-columns p {
  color: var(--course-muted);
}

.course-list {
  display: grid;
  gap: 0.75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.course-list li {
  position: relative;
  padding: 0.9rem 1rem 0.9rem 2.6rem;
  border-radius: 0.75rem;
  background: #ffffff;
  color: var(--course-muted);
}

.course-list li::before {
  content: "✓";
  position: absolute;
  left: 1rem;
  color: var(--course-brand);
  font-weight: 900;
}

.course-related {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1.5rem;
}

.course-related a {
  padding: 0.55rem 0.8rem;
  border: 1px solid var(--course-border);
  border-radius: 999px;
  color: var(--course-brand-dark);
  background: #ffffff;
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
}

.course-related a:hover,
.course-related a:focus-visible {
  border-color: var(--course-brand);
  background: #e5f5f0;
}

.course-contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 2rem;
  align-items: center;
  margin-top: 2rem;
  padding: 1.5rem;
  border-radius: 1rem;
  background: var(--course-ink);
  color: #ffffff;
}

.course-contact h2 {
  color: #ffffff;
}

.course-contact p,
.course-contact address {
  margin: 0.7rem 0 0;
  color: #d9e7e4;
  font-style: normal;
}

.course-contact a:not(.course-cta) {
  color: #b7f0e5;
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

.course-footer {
  padding: 1.5rem 0;
  background: #071d2b;
  color: #d9e7e4;
  font-size: 0.9rem;
}

.course-footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.course-footer p {
  margin: 0;
}

.course-footer a {
  color: #b7f0e5;
}

@media (max-width: 800px) {
  .course-header-inner {
    min-height: 64px;
  }

  .course-header nav a:not(.course-cta) {
    display: none;
  }

  .course-grid,
  .course-columns,
  .course-contact {
    grid-template-columns: 1fr;
  }

  .course-contact .course-cta {
    width: fit-content;
  }
}

@media (max-width: 520px) {
  .course-header-inner,
  .course-container {
    width: min(100% - 1.25rem, 1120px);
  }

  .course-brand span {
    max-width: 12rem;
  }

  .course-hero-actions > * {
    width: 100%;
  }

  .course-hero-actions .course-secondary-cta {
    justify-content: flex-start;
  }
}