@font-face {
  font-family: "Charis CQ Tone";
  src: url("../assets/fonts/charis/Charis-Regular.woff2") format("woff2");
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}

:root {
  --teach-cream: #fff9ef;
  --teach-navy: #0b3267;
  --teach-blue: #075dbd;
  --teach-pale-blue: #afc9e2;
  --teach-teal: #66a6ae;
  --teach-yellow: #f4be3e;
  --teach-ink: #17202a;
  --teach-line: #cbd3dc;
}

.teaching-page {
  color: var(--teach-ink);
  background: #f3f5f7;
}

.teaching-page .site-header {
  color: var(--white);
  background: var(--teach-navy);
  border-bottom-color: var(--teach-ink);
  box-shadow: 0 5px 0 var(--teach-pale-blue);
}

.teaching-page .brand,
.teaching-page .top-nav button,
.teaching-page .top-nav a {
  color: var(--white);
}

.teaching-page .top-nav button,
.teaching-page .top-nav a {
  border-left-color: var(--teach-pale-blue);
}

.teaching-page .top-nav button:last-child,
.teaching-page .top-nav a:last-child,
.teaching-page .more-menu {
  border-right-color: var(--teach-pale-blue);
}

.teaching-page .top-nav [aria-current="page"] {
  color: var(--white);
  background: var(--teach-blue);
}

.teaching-page .top-nav button:hover,
.teaching-page .top-nav button:focus-visible,
.teaching-page .top-nav a:hover,
.teaching-page .top-nav a:focus-visible {
  color: var(--teach-navy);
  background: var(--teach-pale-blue);
}

.teaching-page main {
  min-height: 100vh;
}

.teaching-hero {
  display: grid;
  min-height: clamp(330px, 38vw, 510px);
  place-items: center;
  padding: 54px 24px;
  background-color: #f7f5ef;
  background-image: var(--chongqing-learning-pattern);
  background-position: center;
  background-repeat: repeat;
  background-size: 520px 520px;
  border-bottom: 5px solid var(--teach-navy);
}

.teaching-hero-copy {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.teaching-eyebrow {
  order: 2;
  width: fit-content;
  margin: 18px 0 0;
  padding: 7px 13px 6px;
  color: var(--white);
  background: var(--teach-blue);
  border: 2px solid var(--teach-navy);
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: .12em;
}

.teaching-hero h1 {
  position: relative;
  isolation: isolate;
  margin: 0;
  color: var(--teach-navy);
  font-family: var(--font-serif);
  font-size: clamp(54px, 8vw, 112px);
  font-weight: 900;
  letter-spacing: -.06em;
  line-height: 1;
  text-shadow: 3px 3px 0 rgba(255, 249, 239, .95);
}

.teaching-hero h1::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: 50%;
  left: 50%;
  width: calc(100% + clamp(100px, 16vw, 280px));
  height: 118%;
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0) 0%,
    rgba(255, 255, 255, .9) 18%,
    rgba(255, 255, 255, .96) 50%,
    rgba(255, 255, 255, .9) 82%,
    rgba(255, 255, 255, 0) 100%
  );
  transform: translate(-50%, -50%);
}

.lesson-nav {
  position: sticky;
  z-index: 12;
  top: 56px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: var(--white);
  border-bottom: 2px solid var(--teach-navy);
}

.lesson-nav a {
  padding: 12px 8px;
  color: var(--teach-navy);
  border-right: 1px solid var(--teach-line);
  font-family: var(--font-sans);
  font-weight: 900;
  text-align: center;
  text-decoration: none;
}

.lesson-nav a:last-child {
  border-right: 0;
}

.lesson-nav a:hover,
.lesson-nav a:focus-visible {
  color: var(--white);
  background: var(--teach-blue);
}

.lesson-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 34px auto 64px;
}

.lesson-section {
  margin-bottom: 28px;
  padding: clamp(22px, 4vw, 42px);
  background: var(--white);
  border: 2px solid var(--teach-navy);
  border-top-width: 7px;
  box-shadow: 6px 6px 0 rgba(11, 50, 103, .15);
  scroll-margin-top: 112px;
}

.lesson-section > h2 {
  margin: 0 0 24px;
  color: var(--teach-navy);
  font-family: var(--font-serif);
  font-size: clamp(38px, 5vw, 58px);
  line-height: 1;
}

.sound-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 10px;
}

.sound-card {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
  min-width: 0;
  padding: 13px;
  background: #fbfcfd;
  border: 2px solid var(--teach-line);
}

.sound-symbol {
  color: var(--teach-navy);
  font-family: var(--font-phonetic);
  font-size: 29px;
  font-weight: 900;
  line-height: 1;
}

.sound-ipa {
  color: #566373;
  font-family: var(--font-phonetic);
  font-size: 14px;
}

.sound-example {
  grid-column: 1 / -1;
  display: flex;
  gap: 8px;
  align-items: center;
  justify-content: space-between;
  padding-top: 8px;
  border-top: 1px solid var(--teach-line);
}

.play-example {
  display: inline-flex;
  gap: 6px;
  align-items: center;
  padding: 5px 8px;
  color: var(--white);
  background: var(--teach-blue);
  border: 2px solid var(--teach-navy);
  cursor: pointer;
  font: inherit;
  font-weight: 900;
}

.play-example:hover,
.play-example:focus-visible,
.play-example.is-playing {
  color: var(--teach-navy);
  background: var(--teach-yellow);
}

.example-character {
  padding: 5px 8px;
  color: var(--teach-navy);
  background: #eef2f6;
  border: 2px solid var(--teach-line);
  font-weight: 900;
}

.example-pinyin-teaching {
  font-family: var(--font-phonetic);
  font-size: 13px;
  font-weight: 800;
}

.final-groups {
  display: grid;
  gap: 20px;
}

.final-group h3 {
  width: fit-content;
  margin: 0 0 9px;
  padding: 3px 9px;
  color: var(--white);
  background: var(--teach-navy);
  font-family: var(--font-sans);
  font-size: 15px;
}

.final-group .sound-grid {
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
}

.tone-grid {
  border: 2px solid var(--teach-line);
}

.tone-card {
  display: grid;
  grid-template-columns: minmax(110px, 1.1fr) 72px 64px minmax(170px, 1fr);
  gap: 18px;
  align-items: center;
  padding: 14px 18px;
  background: #fbfcfd;
  border-bottom: 1px solid var(--teach-line);
}

.tone-card:last-child {
  border-bottom: 0;
}

.tone-card strong {
  color: var(--teach-navy);
  font-size: 18px;
}

.tone-contour {
  color: var(--teach-blue);
  font-family: "Charis CQ Tone", "Charis", "Charis SIL", serif;
  font-size: 36px;
  font-weight: 400;
  font-variant-ligatures: common-ligatures contextual;
  font-feature-settings: "ccmp" 1, "liga" 1, "rlig" 1;
  letter-spacing: 0;
  white-space: nowrap;
}

.tone-value {
  margin: 0;
  color: #5f6b78;
  font-family: var(--font-phonetic);
  font-size: 20px;
  font-weight: 900;
}

.tone-example {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-phonetic);
  font-size: 22px;
  font-weight: 900;
}

.tone-card .play-example {
  min-width: 58px;
  justify-content: center;
}

.tone-marking {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: 16px;
  border: 2px solid var(--teach-line);
}

.tone-marking span {
  padding: 12px;
  border-right: 1px solid var(--teach-line);
  font-family: var(--font-phonetic);
  font-size: 18px;
  text-align: center;
}

.tone-marking span:last-child {
  border-right: 0;
}

.tone-marking code {
  color: #596575;
}

.tone-marking b {
  color: var(--teach-blue);
  font-size: 23px;
}

.search-methods {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-bottom: 22px;
}

.search-methods span {
  padding: 7px 11px;
  color: var(--teach-navy);
  background: #e9f1f8;
  border: 1px solid #a8bfd3;
  font-weight: 800;
}

.teaching-entry-demo {
  max-width: 850px;
  margin: 0;
  box-shadow: none;
}

.teaching-page .site-footer {
  background: var(--teach-navy);
  border-top-color: var(--teach-blue);
}

html[data-theme="dark"] .teaching-page {
  color: var(--white);
  background: var(--teach-ink);
}

html[data-theme="dark"] .teaching-page .site-header {
  background: var(--teach-ink);
  border-bottom-color: var(--teach-pale-blue);
  box-shadow: 0 5px 0 var(--teach-navy);
}

html[data-theme="dark"] .teaching-page .top-nav button,
html[data-theme="dark"] .teaching-page .top-nav a {
  color: var(--white);
  border-color: var(--teach-teal);
}

html[data-theme="dark"] .teaching-page .top-nav button:hover,
html[data-theme="dark"] .teaching-page .top-nav button:focus-visible,
html[data-theme="dark"] .teaching-page .top-nav a:hover,
html[data-theme="dark"] .teaching-page .top-nav a:focus-visible {
  color: var(--teach-navy);
  background: var(--teach-pale-blue);
}

html[data-theme="dark"] .teaching-page .top-nav [aria-current="page"] {
  color: var(--white);
  background: var(--teach-blue);
}

html[data-theme="dark"] .teaching-hero {
  background-color: var(--teach-navy);
  background-image: var(--chongqing-learning-pattern);
  background-blend-mode: multiply;
}

html[data-theme="dark"] .teaching-hero h1 {
  color: var(--white);
  text-shadow: 3px 3px 0 var(--teach-ink);
}

html[data-theme="dark"] .teaching-hero h1::before {
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--teach-ink) 18%,
    var(--teach-ink) 82%,
    transparent 100%
  );
}

html[data-theme="dark"] .teaching-page .lesson-nav {
  background: var(--teach-navy);
  border-bottom-color: var(--teach-teal);
}

html[data-theme="dark"] .teaching-page .lesson-nav a {
  color: var(--white);
  border-right-color: var(--teach-teal);
}

html[data-theme="dark"] .teaching-page .lesson-nav a:hover,
html[data-theme="dark"] .teaching-page .lesson-nav a:focus-visible {
  color: var(--teach-navy);
  background: var(--teach-pale-blue);
}

html[data-theme="dark"] .teaching-page .lesson-section,
html[data-theme="dark"] .teaching-page .sound-card,
html[data-theme="dark"] .teaching-page .tone-card {
  color: var(--white);
  background: var(--teach-navy);
}

html[data-theme="dark"] .teaching-page .sound-card,
html[data-theme="dark"] .teaching-page .tone-card {
  background: var(--teach-ink);
}

html[data-theme="dark"] .teaching-page .lesson-section > h2,
html[data-theme="dark"] .teaching-page .sound-symbol,
html[data-theme="dark"] .teaching-page .tone-card strong {
  color: var(--teach-pale-blue);
}

html[data-theme="dark"] .teaching-page .sound-ipa,
html[data-theme="dark"] .teaching-page .tone-value {
  color: var(--teach-pale-blue);
}

html[data-theme="dark"] .teaching-page .sound-card,
html[data-theme="dark"] .teaching-page .tone-grid,
html[data-theme="dark"] .teaching-page .tone-card,
html[data-theme="dark"] .teaching-page .tone-marking {
  border-color: var(--teach-teal);
}

html[data-theme="dark"] .teaching-page .tone-marking span {
  border-color: var(--teach-teal);
}

html[data-theme="dark"] .teaching-page .search-methods span {
  color: var(--white);
  background: var(--teach-navy);
  border-color: var(--teach-teal);
}

html[data-theme="dark"] .teaching-page .teaching-entry-demo .results,
html[data-theme="dark"] .teaching-page .teaching-entry-demo .entry {
  color: var(--white);
  background: var(--teach-ink);
}

html[data-theme="dark"] .teaching-page .teaching-entry-demo .results-head {
  background: var(--teach-blue);
}

html[data-theme="dark"] .teaching-page .teaching-entry-demo .definition-block,
html[data-theme="dark"] .teaching-page .teaching-entry-demo .example {
  border-color: var(--teach-teal);
}

@media (max-width: 700px) {
  .tone-card {
    grid-template-columns: 1fr 60px 54px;
  }

  .tone-example {
    grid-column: 1 / -1;
    padding-top: 8px;
    border-top: 1px solid var(--teach-line);
  }

  .tone-marking {
    grid-template-columns: repeat(2, 1fr);
  }

  .tone-marking span:nth-child(2) {
    border-right: 0;
  }

  .tone-marking span:nth-child(-n + 2) {
    border-bottom: 1px solid var(--teach-line);
  }
}

@media (max-width: 560px) {
  .teaching-hero {
    min-height: 300px;
    padding: 42px 18px;
    background-position: center;
    background-size: 520px 520px;
  }

  .teaching-hero h1 {
    max-width: 7em;
    font-size: 54px;
  }

  .teaching-hero h1::before {
    width: calc(100% + 64px);
    height: 132%;
  }

  .teaching-eyebrow {
    font-size: 11px;
  }

  .lesson-nav a {
    font-size: 13px;
  }

  .lesson-shell {
    width: calc(100% - 18px);
    margin-top: 18px;
  }

  .lesson-section {
    padding: 18px 13px;
    box-shadow: 4px 4px 0 rgba(11, 50, 103, .15);
  }

  .lesson-section > h2 {
    margin-bottom: 18px;
  }

  .sound-grid,
  .final-group .sound-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 7px;
  }

  .sound-card {
    padding: 10px;
  }

  .tone-card {
    gap: 8px;
    padding: 12px 10px;
  }

  .tone-marking {
    grid-template-columns: 1fr;
  }

  .tone-marking span,
  .tone-marking span:nth-child(2) {
    border-right: 0;
    border-bottom: 1px solid var(--teach-line);
  }

  .tone-marking span:last-child {
    border-bottom: 0;
  }
}