.site-shell {
  width: min(100%, calc(var(--max-width) + 3rem));
  margin: 0 auto;
  padding: 1rem 1.5rem 3rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  padding-top: 0.25rem;
}

.site-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: 0.25rem 1.25rem;
  border: 1px solid var(--color-line);
  border-radius: 999px;
  background: rgba(255, 253, 249, 0.88);
  backdrop-filter: blur(18px);
  box-shadow: 0 18px 48px -28px var(--color-shadow);
}

.section-shell {
  padding: var(--space-8) 0 0;
}

.section-shell--panel {
  position: relative;
}

.section-heading {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  max-width: 760px;
  margin-bottom: var(--space-5);
}

.hero {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-6);
  min-height: calc(100vh - 7rem);
  padding-top: var(--space-6);
}

@supports (display: grid) {
  .hero {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
  }
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-5);
}

.feature-grid,
.course-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

@supports (display: grid) {
  .feature-grid,
  .course-grid {
    display: grid;
  }

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

  .course-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

.team-stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.site-footer {
  padding: var(--space-6) var(--space-4) 0;
  text-align: center;
}

@media (max-width: 1080px) {
  .hero {
    grid-template-columns: 1fr;
    gap: var(--space-5);
    min-height: auto;
    padding-top: var(--space-5);
  }

  .hero__copy {
    text-align: center;
  }

  .hero__actions {
    justify-content: center;
  }

  .hero__visual {
    max-height: 420px;
    overflow: hidden;
  }

  .hero__visual img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }

  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .course-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .site-shell {
    padding-inline: 1rem;
  }

  .site-header__inner {
    border-radius: 28px;
  }

  .section-shell {
    padding-top: var(--space-7);
  }

  .hero {
    padding-top: var(--space-4);
    gap: var(--space-4);
  }

  .hero__visual {
    max-height: 320px;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

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

  .section-heading {
    margin-inline: auto;
    text-align: center;
    margin-bottom: var(--space-4);
  }
}

@media (max-width: 480px) {
  .site-shell {
    padding-inline: 0.75rem;
    padding-bottom: var(--space-6);
  }

  .section-shell {
    padding-top: var(--space-6);
  }

  .section-heading {
    margin-bottom: var(--space-3);
  }

  .hero {
    padding-top: var(--space-3);
    gap: var(--space-3);
  }

  .hero__visual {
    max-height: 210px;
  }

  .hero__actions {
    gap: var(--space-2);
    margin-top: var(--space-4);
  }

  .site-footer {
    padding: var(--space-5) var(--space-3) 0;
  }
}