.notebook-margin { position: fixed; inset: 0 auto 0 0; width: 260px; padding: 34px 24px 22px 28px; overflow-y: auto; scrollbar-width: thin; background: #ffffff; }
.margin-heading { padding-bottom: 20px; }
.notebook-cover { display: flex; flex-direction: column; gap: 18px; width: fit-content; min-height: 48px; text-decoration: none; color: var(--letter-ink); }
.cover-title { font-size: 18px; line-height: 1.4; font-weight: 600; }
.doorway-sign { display: block; width: 41px; height: 42px; border: 7px solid var(--notebook-blue); border-bottom: 0; border-radius: 26px 26px 0 0; position: relative; }
.doorway-sign::after { content: ""; position: absolute; width: 7px; height: 23px; background: var(--notebook-blue); inset: 12px auto 0 10px; }
.margin-pages { padding-top: 18px; }
.index-caption { font-size: 16px; color: var(--quiet-ink); margin-bottom: 9px; }
.index-list { list-style: none; margin: 0; padding: 0; }
.index-item { margin: 0; padding: 0; }
.index-link { display: flex; align-items: center; min-height: 45px; padding: 9px 12px; margin-left: -12px; font-size: 16px; line-height: 1.35; text-decoration: none; color: #353a49; }
.index-link:hover { background: var(--blue-wash); color: var(--pressed-blue); }
.index-link[aria-current="page"] { color: #ffffff; background: var(--notebook-blue); }
.margin-top { display: inline-flex; align-items: center; gap: 12px; min-height: 48px; padding-block: 10px; margin-top: 20px; font-size: 16px; }
.mobile-index-jump { display: none; }

@media (max-width: 950px) {
  .notebook-margin { display: contents; }
  .margin-heading { order: 1; display: flex; justify-content: space-between; align-items: flex-start; gap: 18px; padding: 24px 24px 15px; }
  .notebook-cover { flex-direction: row; gap: 12px; align-items: center; }
  .cover-title { font-size: 16px; }
  .doorway-sign { flex: 0 0 32px; width: 32px; height: 35px; border-width: 6px; }
  .doorway-sign::after { width: 6px; height: 20px; top: 9px; left: 7px; }
  .mobile-index-jump { display: inline-flex; align-items: center; gap: 8px; min-height: 48px; font-size: 16px; white-space: nowrap; }
  .margin-pages { order: 3; padding: 28px 24px 32px; background: var(--blue-wash); scroll-margin-top: 10px; }
  .index-list { display: grid; grid-template-columns: 1fr 1fr; gap: 4px 15px; margin-top: 15px; }
  .index-link { min-height: 48px; padding: 10px 8px; margin: 0; font-size: 16px; }
  .index-caption { color: var(--letter-ink); font-family: var(--round-face); font-size: 25px; }
  .margin-top { margin-top: 18px; }
}
@media (max-width: 360px) {
  .margin-heading { flex-wrap: wrap; }
  .index-list { grid-template-columns: 1fr; }
}