@layer components {
  .course-button,
  .course-nav__link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.45rem;
    min-height: 2.8rem;
    padding: 0.7rem 1rem;
    border: 1px solid transparent;
    border-radius: var(--radius-full);
    background: rgba(9, 56, 74, 0.08);
    color: var(--color-primary-dark);
    font-size: 0.95rem;
    font-weight: var(--font-weight-semibold);
    text-decoration: none;
    transition:
      transform var(--transition-normal),
      box-shadow var(--transition-normal),
      background-color var(--transition-fast),
      border-color var(--transition-fast),
      color var(--transition-fast);
  }

  .course-button:hover,
  .course-nav__link:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
  }

  .course-nav__link.is-active {
    background: rgba(15, 93, 115, 0.16);
    border-color: rgba(15, 93, 115, 0.18);
    color: var(--color-primary-dark);
  }

  .course-button {
    background: var(--color-primary-dark);
    color: var(--color-text-inverted);
    box-shadow: var(--shadow-sm);
  }

  .course-button--secondary {
    border-color: rgba(255, 255, 255, 0.14);
    background: rgba(255, 255, 255, 0.08);
    color: var(--color-text-inverted);
  }

  .course-panel {
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    background: var(--color-surface-card);
    box-shadow: var(--shadow-sm);
  }

  .course-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    width: fit-content;
    padding: 0.45rem 0.75rem;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.08);
    color: rgba(248, 250, 252, 0.9);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
  }

  .course-search {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 0.65rem;
    align-items: center;
  }

  .course-search__input,
  .course-nav__lesson-jump {
    min-height: 2.9rem;
    padding: 0.7rem 0.95rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    background: rgba(255, 253, 248, 0.9);
    color: var(--color-text);
    box-shadow: inset 0 1px 2px rgba(12, 29, 39, 0.04);
  }

  .course-search__input {
    width: 100%;
  }

  .course-nav__lesson-jump {
    max-width: 15rem;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    padding-right: 2.4rem;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' fill='none' stroke='%235f6b73' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1.1rem center;
    background-size: 0.65rem;
  }

  [data-theme="dark"] .course-nav__lesson-jump {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' fill='none' stroke='%23b4c1c8' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  }

  .course-search__button {
    min-width: 7rem;
    border: none;
  }

  .global-search-results {
    padding: 1rem 1.2rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-surface-card);
    box-shadow: var(--shadow-sm);
  }

  .global-search-results h3 {
    margin-bottom: 0.8rem;
    font-size: 1rem;
    color: var(--color-primary-dark);
  }

  .global-search-results ul {
    display: grid;
    gap: 0.9rem;
    padding-left: 1.2rem;
  }

  .global-search-results li {
    color: var(--color-text-muted);
  }

  .global-search-results p,
  .global-search-empty {
    margin-top: 0.3rem;
    color: var(--color-text-muted);
  }

  .course-prose {
    position: relative;
    overflow: hidden;
    padding: clamp(1.4rem, 3vw, 2.8rem);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    background: linear-gradient(
        180deg,
        rgba(255, 255, 255, 0.62),
        transparent 8%
      )
      var(--color-surface-card);
    box-shadow: var(--shadow-sm);
  }

  .course-prose::before {
    content: "";
    position: absolute;
    inset: 0 auto auto 0;
    width: 100%;
    height: 0.4rem;
    background: linear-gradient(
      90deg,
      var(--color-primary-dark),
      var(--color-primary),
      #86b9c3
    );
  }

  .course-prose > * + * {
    margin-top: 1.1rem;
  }

  .course-prose h1,
  .course-prose h2,
  .course-prose h3 {
    letter-spacing: -0.02em;
    line-height: 1.12;
  }

  .course-prose h1 {
    font-size: clamp(2rem, 1.55rem + 1.9vw, 3.15rem);
  }

  .course-prose h2 {
    margin-top: 2.4rem;
    padding-top: 0.3rem;
    color: var(--color-primary-dark);
    font-size: var(--font-size-lg);
  }

  .course-prose h3 {
    color: var(--color-text);
    font-size: clamp(1.15rem, 1rem + 0.65vw, 1.55rem);
  }

  .course-prose p,
  .course-prose li,
  .course-prose td,
  .course-prose th {
    color: var(--color-text);
  }

  .course-prose ul,
  .course-prose ol {
    padding-left: 1.3rem;
  }

  .course-prose li + li {
    margin-top: 0.45rem;
  }

  .course-prose hr {
    margin: 2rem 0;
    border: none;
    border-top: 1px solid var(--color-border);
  }

  .course-prose blockquote {
    padding: 1rem 1.15rem;
    border-left: 4px solid var(--color-primary);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    background: rgba(15, 93, 115, 0.06);
    color: var(--color-text-muted);
  }

  .course-prose code {
    padding: 0.15rem 0.38rem;
    border: 1px solid rgba(9, 56, 74, 0.12);
    border-radius: var(--radius-xs);
    background: rgba(9, 56, 74, 0.06);
    font-family: var(--font-family-mono);
    font-size: 0.92em;
  }

  .course-prose pre {
    overflow-x: auto;
    padding: 1rem 1.15rem;
    border: 1px solid rgba(9, 56, 74, 0.12);
    border-radius: var(--radius-md);
    background: #f5f7f8;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.7);
  }

  .course-prose pre code {
    padding: 0;
    border: none;
    background: transparent;
  }

  .course-prose table {
    display: block;
    width: 100%;
    overflow-x: auto;
    border-collapse: separate;
    border-spacing: 0;
  }

  .course-prose table thead th {
    position: sticky;
    top: 0;
    z-index: 1;
    background: linear-gradient(180deg, var(--color-primary-dark), #0e4d63);
    color: var(--color-text-inverted);
    white-space: nowrap;
  }

  .course-prose table th,
  .course-prose table td {
    padding: 0.9rem 1rem;
    border-right: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    background: rgba(255, 253, 248, 0.9);
    text-align: left;
    vertical-align: top;
  }

  .course-prose table tr td:first-child,
  .course-prose table tr th:first-child {
    border-left: 1px solid var(--color-border);
  }

  .course-prose table tr:first-child th:first-child {
    border-top-left-radius: var(--radius-md);
  }

  .course-prose table tr:first-child th:last-child {
    border-top-right-radius: var(--radius-md);
  }

  .course-prose table tr:last-child td:first-child {
    border-bottom-left-radius: var(--radius-md);
  }

  .course-prose table tr:last-child td:last-child {
    border-bottom-right-radius: var(--radius-md);
  }

  .course-prose table tbody tr:nth-child(even) td {
    background: rgba(215, 237, 242, 0.16);
  }

  .course-page--lesson .course-prose {
    padding-top: 2.1rem;
  }

  @media (prefers-reduced-motion: no-preference) {
    .course-panel,
    .course-prose,
    .global-search-results {
      transition:
        transform var(--transition-normal),
        box-shadow var(--transition-normal);
    }

    .course-panel:hover,
    .course-prose:hover,
    .global-search-results:hover {
      transform: translateY(-2px);
      box-shadow: var(--shadow-md);
    }
  }

  @media (max-width: 900px) {
    .course-search {
      grid-template-columns: 1fr;
    }

    .course-search__button {
      width: 100%;
    }
  }

  @media (max-width: 640px) {
    .course-prose,
    .global-search-results {
      border-radius: var(--radius-lg);
    }

    .course-nav__lesson-jump {
      max-width: none;
      width: 100%;
    }
  }
}