:root {
  --accent: #4e168f;
  --accent-dark: #2f0d68;
  --border: #dddddd;
  --ink: #1f2b33;
  --muted: #5d6970;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background: #ffffff;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 15px;
  line-height: 1.5;
}

a {
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
}

a:hover,
a:focus {
  color: var(--accent-dark);
  text-decoration: underline;
}

.site-header {
  color: #ffffff;
  background: #3b0d6b;
}

.header-content,
main,
footer {
  width: min(1080px, calc(100% - 32px));
  margin: 0 auto;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 82px;
}

.logo-link {
  display: block;
}

.logo-link img {
  display: block;
  width: 165px;
  height: auto;
}

.logo-link:focus-visible {
  outline: 2px solid #ffffff;
  outline-offset: 5px;
}

nav {
  display: flex;
  gap: 24px;
}

nav a {
  color: #ffffff;
  font-size: 14px;
  font-weight: 500;
}

nav a:hover,
nav a:focus {
  color: #ffffff;
}

main {
  min-height: calc(100vh - 160px);
  padding: 32px 0 64px;
}

h1 {
  margin: 0 0 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  color: #17384b;
  font-size: 34px;
  font-weight: 600;
  letter-spacing: -0.02em;
}

p {
  margin: 0 0 16px;
}

h2 {
  margin: 36px 0 14px;
  color: #263c49;
  font-size: 24px;
  font-weight: 600;
}

.course {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 18px;
  padding: 14px 12px;
  border: 1px solid var(--border);
}

.course-code {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.course h3 {
  margin: 0 0 2px;
  font-size: 16px;
  font-weight: 600;
}

.course p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

footer {
  padding: 18px 0;
  border-top: 1px solid var(--border);
  background: #f5f8fa;
  color: var(--muted);
  font-size: 13px;
}

footer p {
  margin: 0;
}

@media (max-width: 560px) {
  .header-content {
    min-height: 68px;
  }

  .logo-link img {
    width: 120px;
  }

  nav {
    gap: 16px;
  }

  main {
    padding-top: 28px;
  }

  h1 {
    font-size: 29px;
  }

  .course {
    grid-template-columns: 1fr;
    gap: 6px;
  }
}