/* ---------- Course design variables ---------- */

:root {
  --course-text: #17191d;
  --course-muted: #636b78;
  --course-border: #dfe3e8;
  --course-surface: #f5f7fa;
  --course-accent: #4f46e5;
  --course-accent-dark: #3730a3;
  --course-max-width: 1120px;
}


/* ---------- Base typography ---------- */

.course-page {
  color: var(--course-text);
  font-family:
    "Helvetica Neue",
    Helvetica,
    Arial,
    sans-serif;
  font-size: 17px;
  line-height: 1.5;
}

.course-page p,
.course-page li {
  max-width: 76ch;
}

.course-page a {
  color: var(--course-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

.course-page a:hover {
  color: var(--course-accent-dark);
}


/* ---------- Course hero ---------- */

.course-hero {
  margin: 0 0 3rem;
  padding: clamp(2rem, 5vw, 4.5rem);
  border: 1px solid var(--course-border);
  border-radius: 20px;
  background:
    linear-gradient(
      135deg,
      rgba(79, 70, 229, 0.12),
      rgba(255, 255, 255, 0.95) 60%
    );
}

.course-kicker {
  margin: 0 0 0.75rem;
  color: var(--course-accent-dark);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.course-title {
  margin: 0;
  font-size: clamp(2.8rem, 8vw, 6.5rem);
  font-weight: 750;
  letter-spacing: -0.06em;
  line-height: 0.95;
}

.course-subtitle {
  max-width: 780px;
  margin: 1rem 0 0;
  color: var(--course-muted);
  font-size: clamp(1.25rem, 3vw, 2rem);
  font-weight: 400;
  line-height: 1.25;
}


/* ---------- Section navigation ---------- */

.course-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 2rem;
}

.course-nav a {
  display: inline-block;
  padding: 0.55rem 0.9rem;
  border: 1px solid var(--course-border);
  border-radius: 999px;
  background: white;
  color: var(--course-text);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
}

.course-nav a:hover {
  border-color: var(--course-accent);
  color: var(--course-accent);
}


/* ---------- Headings ---------- */

.course-page h2,
.course-page h3,
.course-page h4 {
  color: var(--course-text);
  font-family:
    "Helvetica Neue",
    Helvetica,
    Arial,
    sans-serif;
  letter-spacing: -0.025em;
}

.course-page h3 {
  margin-top: 2.5rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--course-border);
  font-size: 1.3rem;
}

.course-page h4 {
  margin-top: 2rem;
  font-size: 1.15rem;
}


/* ---------- Tables ---------- */

.course-page table {
  display: block;
  width: 100%;
  margin: 1.5rem 0 2.5rem;
  overflow-x: auto;
  border-collapse: collapse;
  font-size: 0.92rem;
  line-height: 1.45;
}

.course-page th,
.course-page td {
  min-width: 8rem;
  padding: 0.85rem;
  border: 1px solid var(--course-border);
  vertical-align: top;
  text-align: left;
}

.course-page th {
  background: var(--course-surface);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.course-page tr:nth-child(even) td {
  background: #fafbfc;
}


/* ---------- Small screens ---------- */

@media (max-width: 700px) {
  .course-page {
    font-size: 16px;
  }

  .course-hero {
    padding: 1.5rem;
    border-radius: 14px;
  }

  .course-page th,
  .course-page td {
    min-width: 9rem;
    padding: 0.7rem;
  }
}