@keyframes heart {
    0%, 40%, 80%, 100% {
      transform: scale(1);
    }
    20%, 60% {
      transform: scale(1.15);
    }
  }
  .heart {
    animation: heart 1000ms infinite;
  }

/* Keep docs-center as homepage only; hide its top tab on SKU pages. */
.md-tabs__item:first-child {
  display: none;
}

/* Remove duplicated site title block in header (next to logo). */
.md-header__title[data-md-component="header-title"] {
  display: none !important;
}

/* Desktop header layout: center search, keep tool buttons on the right. */
@media screen and (min-width: 60em) {
  .md-search[data-md-component="search"] {
    order: 2;
    margin-left: auto;
    margin-right: auto;
  }

  .md-header__option,
  .md-header__button[for="__search"] {
    order: 3;
  }
}

.docs-center-home {
  max-width: 1100px;
  margin: 0 auto;
  padding: 56px 16px 72px;
  position: relative;
}

.docs-center-home::before {
  content: "";
  position: absolute;
  inset: 0;
  margin: auto;
  width: min(360px, 70vw);
  height: 100%;
  border-radius: 48px;
  background: linear-gradient(
    180deg,
    rgba(66, 122, 209, 0.14),
    rgba(66, 122, 209, 0.04) 30%,
    rgba(66, 122, 209, 0.08)
  );
  pointer-events: none;
  filter: blur(1px);
}

.docs-center-hero {
  position: relative;
  text-align: center;
  padding: 52px 20px 34px;
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.26);
  backdrop-filter: blur(2px);
  color: #142643;
}

.docs-center-eyebrow {
  margin: 0 0 12px;
  font-size: 14px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #35548b;
}

.docs-center-title {
  margin: 0;
  font-size: clamp(2rem, 5vw, 4rem);
  line-height: 1.1;
  font-weight: 700;
}

.docs-center-subtitle {
  margin: 0;
  margin-top: 14px;
  font-size: clamp(1rem, 2vw, 1.75rem);
  color: #1f355e;
}

[data-md-color-scheme="slate"] .docs-center-hero {
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(3px);
  color: #ffffff;
}

[data-md-color-scheme="slate"] .docs-center-eyebrow,
[data-md-color-scheme="slate"] .docs-center-subtitle {
  color: rgba(255, 255, 255, 0.88);
}

.docs-center-grid {
  position: relative;
  margin-top: 24px;
  --docs-center-card-gap: 24px;
  --docs-center-card-peek: 32px;
  --docs-center-card-width: calc((100% - (var(--docs-center-card-gap) * 2) - var(--docs-center-card-peek)) / 2);
}

.docs-center-card-rail {
  display: flex;
  gap: var(--docs-center-card-gap);
  overflow-x: auto;
  overscroll-behavior-x: contain;
  -webkit-overflow-scrolling: touch;
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
  scrollbar-color: rgba(53, 84, 139, 0.38) transparent;
  padding: 4px 0 14px;
}

.docs-center-card-rail::-webkit-scrollbar {
  height: 8px;
}

.docs-center-card-rail::-webkit-scrollbar-thumb {
  background: rgba(53, 84, 139, 0.28);
  border-radius: 999px;
}

.docs-center-card-rail::-webkit-scrollbar-track {
  background: transparent;
}

.docs-center-card {
  display: flex;
  flex: 0 0 var(--docs-center-card-width);
  flex-direction: column;
  min-height: 100%;
  padding: 22px 22px 24px;
  border-radius: 18px;
  text-decoration: none;
  color: inherit;
  border: 1px solid rgba(54, 84, 139, 0.16);
  background: rgba(255, 255, 255, 0.82);
  scroll-snap-align: start;
  scroll-snap-stop: always;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.docs-center-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 26px rgba(28, 40, 58, 0.14);
  border-color: rgba(54, 84, 139, 0.45);
}

.docs-center-card:focus-visible {
  outline: 3px solid rgba(31, 79, 155, 0.28);
  outline-offset: 3px;
}

.docs-center-card-tag {
  display: inline-block;
  align-self: flex-start;
  margin-bottom: 12px;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 12px;
  color: #35548b;
  background: rgba(53, 84, 139, 0.1);
}

.docs-center-card-title {
  margin: 0;
  font-size: 1.75rem;
  font-weight: 700;
}

.docs-center-card > p:not(.docs-center-card-title) {
  margin: 10px 0 20px;
  line-height: 1.6;
  color: #485772;
  flex: 1 1 auto;
}

.docs-center-card-link {
  margin-top: auto;
  font-weight: 600;
  color: #1f4f9b;
}

.docs-center-card--data {
  border-color: rgba(54, 84, 139, 0.16);
  background: rgba(255, 255, 255, 0.82);
}

.docs-center-more {
  position: relative;
  margin-top: 24px;
  border: 1px solid var(--md-default-fg-color--lightest);
  border-radius: 18px;
  background: var(--md-default-bg-color);
  overflow: hidden;
}

.docs-center-more > summary {
  cursor: pointer;
  padding: 18px 22px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--md-default-fg-color);
  background: rgba(53, 84, 139, 0.08);
}

.docs-center-more-content {
  padding: 4px 22px 20px;
  font-size: 0.78rem;
}

.docs-center-more-content h3 {
  margin-top: 16px;
  margin-bottom: 8px;
}

.docs-center-more-content p,
.docs-center-more-content li {
  color: var(--md-default-fg-color);
  line-height: 1.5;
}

.docs-center-more-content a {
  color: var(--md-typeset-a-color);
}

/* ======================================================
   Top Tabs Navigation — Active/Focus Emphasis
   ====================================================== */

/* Light mode header surface */
[data-md-color-scheme="default"] .md-header,
[data-md-color-scheme="default"] .md-tabs {
  background: #f8fafc;
}

[data-md-color-scheme="default"] .md-header {
  box-shadow: 0 1px 0 rgba(15, 23, 42, 0.10);
}

[data-md-color-scheme="default"] .md-header .md-header__button,
[data-md-color-scheme="default"] .md-header .md-header__title,
[data-md-color-scheme="default"] .md-header .md-header__topic {
  color: #0f172a;
}

[data-md-color-scheme="default"] .md-header .md-logo img,
[data-md-color-scheme="default"] .md-header .md-logo svg {
  filter: brightness(0) saturate(100%);
}

[data-md-color-scheme="default"] .md-header .md-search__form {
  background: #eef2f7;
  border: 1px solid #d5dee8;
}

[data-md-color-scheme="default"] .md-header .md-search__input {
  color: #0f172a;
}

[data-md-color-scheme="default"] .md-header .md-search__input::placeholder {
  color: #64748b;
}

[data-md-color-scheme="default"] .md-header .md-search__icon {
  color: #334155;
}

.md-tabs {
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.md-tabs__link {
  margin-top: 0.2rem;
  padding: 0.3rem 0.78rem;
  border-radius: 999px;
  color: rgba(255, 255, 255, 0.78);
  transition: background-color 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
}

.md-tabs__link:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.16);
}

.md-tabs__link:focus-visible {
  outline: 2px solid var(--md-accent-fg-color);
  outline-offset: 2px;
  color: #ffffff;
}

.md-tabs__item--active .md-tabs__link {
  color: #ffffff;
  background: rgba(0, 188, 212, 0.30);
  box-shadow: inset 0 -2px 0 rgba(0, 188, 212, 0.95);
  font-weight: 700;
}

/* Top tabs in light mode */
[data-md-color-scheme="default"] .md-tabs {
  border-bottom: 1px solid rgba(15, 23, 42, 0.10);
}

[data-md-color-scheme="default"] .md-tabs__link {
  color: rgba(15, 23, 42, 0.74);
}

[data-md-color-scheme="default"] .md-tabs__link:hover {
  color: #0f172a;
  background: rgba(15, 23, 42, 0.08);
}

[data-md-color-scheme="default"] .md-tabs__link:focus-visible {
  color: #0f172a;
}

[data-md-color-scheme="default"] .md-tabs__item--active .md-tabs__link {
  color: #0f172a;
  background: rgba(0, 188, 212, 0.22);
  box-shadow: inset 0 -2px 0 rgba(0, 188, 212, 0.9);
}

/* ======================================================
   Sidebar Navigation — Visual Hierarchy & Active Position
   ====================================================== */

/* --- 0. Global nav link spacing --- */
.md-nav--primary .md-nav__link {
  padding-top: 0.2rem;
  padding-bottom: 0.2rem;
  padding-left: 0.4rem;
  line-height: 1.35;
}

/* Reduce sidebar left padding to reclaim space */
.md-nav--primary .md-nav__list {
  padding-left: 0;
}

/* --- 1. Active link: left accent border + background --- */
.md-nav--primary .md-nav__link--active {
  position: relative;
  border-left: 3px solid var(--md-accent-fg-color);
  padding-left: 0.6rem;
  background: rgba(0, 188, 212, 0.08);
  border-radius: 0 6px 6px 0;
  font-weight: 600;
  color: var(--md-default-fg-color) !important;
}

/* --- 2. Section headers (navigation.sections labels) --- */
.md-nav--primary .md-nav__item--section > .md-nav__link {
  font-weight: 700;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--md-default-fg-color);
  margin-top: 0.6rem;
  padding-top: 0.6rem;
  border-top: 1px solid var(--md-default-fg-color--lightest);
}

/* First section header in a list needs no top border */
.md-nav--primary .md-nav__list > .md-nav__item--section:first-child > .md-nav__link {
  border-top: none;
  margin-top: 0;
  padding-top: 0;
}

/* --- 3. Hierarchy level differentiation --- */
/* Level 1 section headers (产品介绍, 开发指南, ...) */
.md-nav[data-md-level="1"] > .md-nav__list > .md-nav__item--section > .md-nav__link {
  font-size: 0.64rem;
  font-weight: 700;
}

/* Level 2 leaf links (产品简介, 硬件安装, ...) */
.md-nav[data-md-level="2"] > .md-nav__list > .md-nav__item > .md-nav__link {
  font-size: 0.7rem;
  font-weight: 400;
}

/* Level 3+ deeper leaf links */
.md-nav[data-md-level="3"] > .md-nav__list > .md-nav__item > .md-nav__link {
  font-size: 0.68rem;
  font-weight: 400;
  padding-left: 1.8rem;
}

/* --- 4. Hover feedback --- */
.md-nav--primary .md-nav__link:hover {
  background: var(--md-default-fg-color--lightest);
  border-radius: 0 6px 6px 0;
  transition: background 0.15s ease;
  color: #000000;
}

/* Active link hover keeps accent background */
.md-nav--primary .md-nav__link--active:hover {
  background: rgba(0, 188, 212, 0.08);
}

/* --- 5. Dark mode (slate) adaptations --- */
[data-md-color-scheme="slate"] .md-nav--primary .md-nav__link--active {
  background: rgba(0, 188, 212, 0.10);
  color: #ffffff !important;
}

[data-md-color-scheme="slate"] .md-nav--primary .md-nav__link:hover {
  background: rgba(255, 255, 255, 0.06);
  color: #ffffff;
}

[data-md-color-scheme="slate"] .md-nav--primary .md-nav__link--active:hover {
  background: rgba(0, 188, 212, 0.10);
}

[data-md-color-scheme="slate"] .md-nav--primary .md-nav__item--section > .md-nav__link {
  color: rgba(255, 255, 255, 1);
  border-top-color: rgba(255, 255, 255, 0.08);
}

/* ======================================================
   Reading Guide Timeline
   ====================================================== */

.reading-guide-timeline {
  position: relative;
  margin: 0.75rem 0 0.1rem;
  padding: 0 0 0 2rem;
}

.reading-guide-timeline::before {
  content: "";
  position: absolute;
  left: 0.8rem;
  top: 0.3rem;
  bottom: 0.45rem;
  width: 2px;
  background: rgba(0, 188, 212, 0.42);
}

.reading-guide-timeline h3 {
  position: relative;
  margin: 0;
  padding: 0 0 0.18rem 0;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.42;
}

.reading-guide-timeline h3 + p {
  margin-top: 0.16rem;
  margin-bottom: 1.05rem;
  font-size: 0.82rem;
  line-height: 1.56;
  color: var(--md-default-fg-color--light);
}

.reading-guide-timeline h3:last-of-type + p {
  margin-bottom: 0;
}

.reading-guide-timeline h3::before {
  content: "";
  position: absolute;
  left: -1.54rem;
  top: 0.24rem;
  width: 0.76rem;
  height: 0.76rem;
  border-radius: 50%;
  border: 2px solid rgba(0, 188, 212, 0.95);
  background: var(--md-default-bg-color);
  box-shadow: 0 0 0 2px rgba(0, 188, 212, 0.14);
}

.reading-guide-timeline h3::after {
  content: "";
  position: absolute;
  left: -1.24rem;
  top: 0.55rem;
  width: 0.18rem;
  height: 0.18rem;
  border-radius: 50%;
  background: rgba(0, 188, 212, 0.95);
}

.reading-guide-timeline h3 a {
  color: rgba(0, 188, 212, 0.98);
  text-decoration: none;
  transition: color 0.15s ease;
}

.reading-guide-timeline h3 a:hover {
  color: rgba(0, 172, 193, 1);
}

.reading-guide-timeline h4 {
  position: relative;
  margin: 0.1rem 0 0;
  padding: 0 0 0 1rem;
  font-size: 0.92rem;
  font-weight: 600;
  line-height: 1.42;
}

.reading-guide-timeline h4::before {
  content: "";
  position: absolute;
  left: 0.08rem;
  top: 0.62rem;
  width: 0.34rem;
  height: 0.34rem;
  border-radius: 50%;
  background: rgba(0, 188, 212, 0.95);
  transform: translateY(-50%);
}

.reading-guide-timeline h4 a {
  color: rgba(0, 188, 212, 0.98);
  text-decoration: none;
  transition: color 0.15s ease;
}

.reading-guide-timeline h4 a:hover {
  color: rgba(0, 172, 193, 1);
}

.reading-guide-timeline h4 + p {
  margin-top: 0.14rem;
  margin-bottom: 1rem;
  margin-left: 1rem;
  font-size: 0.8rem;
  line-height: 1.52;
  color: var(--md-default-fg-color--light);
}

[data-md-color-scheme="slate"] .reading-guide-timeline::before {
  background: rgba(0, 188, 212, 0.45);
}

[data-md-color-scheme="slate"] .reading-guide-timeline h3::before {
  border-color: rgba(0, 188, 212, 0.95);
  background: var(--md-default-bg-color);
  box-shadow: 0 0 0 2px rgba(0, 188, 212, 0.18);
}

[data-md-color-scheme="slate"] .reading-guide-timeline h3::after {
  background: rgba(0, 188, 212, 0.95);
}

[data-md-color-scheme="slate"] .reading-guide-timeline h3 a {
  color: rgba(0, 188, 212, 0.98);
}

[data-md-color-scheme="slate"] .reading-guide-timeline h3 a:hover {
  color: rgba(77, 208, 225, 1);
}

[data-md-color-scheme="slate"] .reading-guide-timeline h4::before {
  background: rgba(0, 188, 212, 0.95);
}

[data-md-color-scheme="slate"] .reading-guide-timeline h4 a {
  color: rgba(0, 188, 212, 0.98);
}

[data-md-color-scheme="slate"] .reading-guide-timeline h4 a:hover {
  color: rgba(77, 208, 225, 1);
}

/* ======================================================
   Changelog Page
   ====================================================== */

.changelog-page {
  margin-top: 0.4rem;
}

.changelog-page .admonition.info {
  margin: 0.9rem 0 1.25rem;
  border-radius: 12px;
  border: 1px solid rgba(0, 188, 212, 0.28);
  border-left: 3px solid rgba(0, 188, 212, 0.95);
  background: rgba(0, 188, 212, 0.08);
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.06);
}

.changelog-page .admonition.info > .admonition-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: rgba(0, 188, 212, 1);
  background: transparent;
}

.changelog-page .admonition.info > .admonition-title::before {
  color: rgba(0, 188, 212, 1);
}

.changelog-page .admonition.info p,
.changelog-page .admonition.info li {
  color: var(--md-default-fg-color);
  line-height: 1.6;
}

.changelog-page .changelog-entry {
  display: grid;
  grid-template-columns: max-content minmax(0, 1fr);
  column-gap: 1.4rem;
  align-items: start;
}

.changelog-page .changelog-entry > h2.changelog-date {
  grid-column: 1;
  margin: 0.35rem 0 0;
}

.changelog-page .changelog-entry > .changelog-entry-body {
  grid-column: 2;
  min-width: 0;
}

.changelog-page h2.changelog-date {
  display: inline-block;
  margin: 0 0 0.95rem;
  padding: 0.26rem 0.72rem;
  border-radius: 10px;
  border: 1px solid rgba(0, 188, 212, 0.32);
  background: rgba(0, 188, 212, 0.14);
  color: rgba(0, 188, 212, 1);
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.changelog-page h2.changelog-date .headerlink {
  display: none;
}

.changelog-page .changelog-section-title {
  margin: 0.08rem 0 0.6rem;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--md-default-fg-color);
}

.changelog-page table {
  margin-top: 0.35rem;
  margin-bottom: 1.5rem;
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--md-default-fg-color--lightest);
}

.changelog-page table thead th {
  border-bottom: 1px solid var(--md-default-fg-color--lightest);
  background: rgba(15, 23, 42, 0.06);
}

.changelog-page table tbody tr:hover {
  background: rgba(0, 188, 212, 0.06);
}

[data-md-color-scheme="slate"] .changelog-page .admonition.info {
  border-color: rgba(0, 188, 212, 0.34);
  border-left-color: rgba(0, 188, 212, 0.95);
  background: rgba(0, 188, 212, 0.08);
  box-shadow: 0 8px 22px rgba(2, 6, 23, 0.38);
}

[data-md-color-scheme="slate"] .changelog-page .admonition.info > .admonition-title,
[data-md-color-scheme="slate"] .changelog-page .admonition.info > .admonition-title::before {
  color: rgba(77, 208, 225, 1);
}

[data-md-color-scheme="slate"] .changelog-page h2.changelog-date {
  border-color: rgba(0, 188, 212, 0.45);
  background: rgba(0, 188, 212, 0.16);
  color: rgba(77, 208, 225, 1);
}

[data-md-color-scheme="slate"] .changelog-page table {
  border-color: rgba(148, 163, 184, 0.2);
}

[data-md-color-scheme="slate"] .changelog-page table thead th {
  border-bottom-color: rgba(148, 163, 184, 0.2);
  background: rgba(255, 255, 255, 0.04);
}

[data-md-color-scheme="slate"] .changelog-page table tbody tr:hover {
  background: rgba(0, 188, 212, 0.08);
}

@media (max-width: 900px) {
  .changelog-page .changelog-entry {
    grid-template-columns: 1fr;
    row-gap: 0.45rem;
  }

  .changelog-page .changelog-entry > h2.changelog-date,
  .changelog-page .changelog-entry > .changelog-entry-body {
    grid-column: 1;
  }

  .changelog-page .admonition.info {
    margin-top: 0.75rem;
    margin-bottom: 1rem;
  }

  .changelog-page .changelog-section-title {
    font-size: 1.18rem;
  }

  .changelog-page h2.changelog-date {
    font-size: 0.86rem;
  }

  .docs-center-home {
    padding-top: 24px;
  }

  .docs-center-home::before {
    width: 75vw;
  }

  .docs-center-hero {
    padding: 38px 16px 24px;
  }

  .docs-center-grid {
    --docs-center-card-gap: 16px;
    --docs-center-card-peek: 24px;
    --docs-center-card-width: min(76vw, 340px);
  }

  .docs-center-card-title {
    font-size: 1.55rem;
  }

  .docs-center-more > summary {
    padding: 16px 16px;
  }

  .docs-center-more-content {
    padding: 2px 16px 16px;
    font-size: 1rem;
  }
}

/* ======================================================
   Reading Guide Page — Visual Rhythm
   ====================================================== */

.reading-guide-page {
  margin-top: 0.35rem;
}

.reading-guide-page > h1 {
  margin: 0 0 1.85rem;
  color: var(--md-default-fg-color);
  font-size: 2.2em;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.reading-guide-page > h2 {
  margin: 0 0 1.35rem;
  color: var(--md-default-fg-color);
  font-size: 1.68em;
  font-weight: 600;
  line-height: 1.28;
}

.reading-guide-page .reading-guide-timeline {
  margin: 0.2rem 0 0.15rem;
  padding: 0 0 0 2.3rem;
}

.reading-guide-page .reading-guide-timeline::before {
  left: 0.92rem;
  top: 0.42rem;
  bottom: 0.62rem;
}

.reading-guide-page .reading-guide-timeline h3 {
  padding-bottom: 0.22rem;
  font-size: 1.06rem;
  font-weight: 600;
  line-height: 1.48;
}

.reading-guide-page .reading-guide-timeline h3 + p {
  margin-top: 0.22rem;
  margin-bottom: 1.28rem;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--md-default-fg-color--light);
}

.reading-guide-page .reading-guide-timeline h3:last-of-type + p {
  margin-bottom: 0;
}

.reading-guide-page .reading-guide-timeline h3::before {
  left: -1.72rem;
  top: 0.26rem;
  width: 0.84rem;
  height: 0.84rem;
}

.reading-guide-page .reading-guide-timeline h3::after {
  left: -1.41rem;
  top: 0.61rem;
  width: 0.2rem;
  height: 0.2rem;
}

.reading-guide-page .reading-guide-timeline h4 {
  margin: 0.18rem 0 0;
  padding: 0 0 0 1.12rem;
  font-size: 0.96rem;
  line-height: 1.48;
}

.reading-guide-page .reading-guide-timeline h4::before {
  left: 0.08rem;
  top: 0.68rem;
  width: 0.38rem;
  height: 0.38rem;
}

.reading-guide-page .reading-guide-timeline h4 + p {
  margin-top: 0.2rem;
  margin-bottom: 1.08rem;
  margin-left: 1.12rem;
  font-size: 0.84rem;
  line-height: 1.68;
}

/* ======================================================
   Desktop Navigation Rhythm
   ====================================================== */

@media screen and (min-width: 76.25em) {
  .md-nav--primary .md-nav__link {
    padding-top: 0.3rem;
    padding-bottom: 0.3rem;
    padding-left: 0.48rem;
    line-height: 1.5;
  }

  .md-nav--primary .md-nav__link--active {
    padding-left: 0.68rem;
  }

  .md-nav--primary .md-nav__item--section > .md-nav__link {
    margin-top: 0.78rem;
    padding-top: 0.72rem;
    padding-bottom: 0.26rem;
    font-size: 0.69rem;
    line-height: 1.45;
    letter-spacing: 0.08em;
  }

  .md-nav[data-md-level="1"] > .md-nav__list > .md-nav__item--section > .md-nav__link {
    font-size: 0.69rem;
  }

  .md-nav[data-md-level="2"] > .md-nav__list > .md-nav__item > .md-nav__link {
    font-size: 0.8rem;
  }

  .md-nav[data-md-level="3"] > .md-nav__list > .md-nav__item > .md-nav__link {
    padding-left: 0.6rem;
    font-size: 0.76rem;
  }

  .md-nav--secondary .md-nav__title {
    padding-bottom: 0.5rem;
    font-size: 0.74rem;
    font-weight: 700;
    line-height: 1.35;
    letter-spacing: 0.04em;
  }

  .md-nav--secondary > .md-nav__list > .md-nav__item > .md-nav__link {
    padding-top: 0.06rem;
    padding-bottom: 0.06rem;
    font-size: 0.76rem;
    font-weight: 600;
    line-height: 1.28;
  }

  .md-nav--secondary > .md-nav__list > .md-nav__item > .md-nav {
    margin-top: 0.08rem;
  }

  .md-nav--secondary .md-nav .md-nav__link {
    padding-top: 0.06rem;
    padding-bottom: 0.06rem;
    font-size: 0.74rem;
    line-height: 1.34;
  }

  .md-nav--secondary .md-nav .md-nav__item + .md-nav__item {
    margin-top: 0.01rem;
  }
}

@media (max-width: 900px) {
  .reading-guide-page > h1 {
    margin-bottom: 1.45rem;
    font-size: 1.95em;
  }

  .reading-guide-page > h2 {
    margin-bottom: 1.05rem;
    font-size: 1.48em;
  }

  .reading-guide-page .reading-guide-timeline {
    padding-left: 2.05rem;
  }

  .reading-guide-page .reading-guide-timeline h3 {
    font-size: 1rem;
  }

  .reading-guide-page .reading-guide-timeline h3 + p {
    margin-bottom: 1.12rem;
    font-size: 0.84rem;
  }

  .reading-guide-page .reading-guide-timeline h4 {
    font-size: 0.9rem;
  }

  .reading-guide-page .reading-guide-timeline h4 + p {
    font-size: 0.8rem;
  }
}