.lrmei-lesson {
  --lrmei-navy: #123f62;
  --lrmei-blue: #1679b8;
  --lrmei-red: #ee6259;
  --lrmei-coral: #f27667;
  --lrmei-aqua: #18a5b5;
  --lrmei-purple: #7865c7;
  --lrmei-canvas: #f7fbfe;
  --lrmei-gold: #efad2f;
  --lrmei-green: #24966f;
  --lrmei-ink: #173247;
  --lrmei-muted: #526c7d;
  --lrmei-border: #cfe0ea;
  --lrmei-shadow: 0 16px 38px rgba(18, 63, 98, 0.12);
  color: var(--lrmei-ink);
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.72;
  margin: 0 auto;
  max-width: 1120px;
}

.lrmei-lesson *,
.lrmei-lesson *::before,
.lrmei-lesson *::after {
  box-sizing: border-box;
}

.lrmei-lesson .lrmei-audio-status {
  border-radius: 8px;
  height: 1px;
  margin: 0;
  overflow: hidden;
  position: absolute;
  width: 1px;
}

.lrmei-lesson .lrmei-audio-status.lrmei-visible {
  background: #fff3cd;
  border: 1px solid #ffe69c;
  color: #664d03;
  height: auto;
  margin: 0 0 14px;
  padding: 10px 14px;
  position: static;
  width: auto;
}

.lrmei-lesson .lrmei-hero {
  background:
    linear-gradient(90deg, rgba(4, 28, 48, 0.99) 0%, rgba(4, 28, 48, 0.96) 42%, rgba(4, 28, 48, 0.74) 56%, rgba(4, 28, 48, 0.04) 76%),
    url("../images/lesson-1-1-hero.webp") center / cover no-repeat;
  border-radius: 24px;
  box-shadow: 0 20px 48px rgba(4, 28, 48, 0.2);
  color: #fff;
  margin: 0 0 24px;
  min-height: 430px;
  overflow: hidden;
  padding: clamp(34px, 5vw, 62px) clamp(28px, 5vw, 62px);
  position: relative;
}

.lrmei-lesson .lrmei-hero::after {
  background: linear-gradient(90deg, #f46d62 0%, #f2bd55 78%, rgba(242, 189, 85, 0) 100%);
  border-radius: 999px;
  content: "";
  height: 4px;
  left: clamp(28px, 5vw, 62px);
  position: absolute;
  top: clamp(66px, 8.5vw, 92px);
  width: min(37%, 390px);
}

.lrmei-lesson .lrmei-hero > * {
  max-width: 54%;
  position: relative;
  z-index: 1;
}

.lrmei-lesson .lrmei-eyebrow {
  color: #f2bd55;
  font-size: 0.86rem;
  font-weight: 800;
  letter-spacing: 0.07em;
  margin-bottom: 42px;
  text-transform: uppercase;
}

.lrmei-lesson .lrmei-eyebrow .lrmei-support-en {
  color: #f2bd55;
}

.lrmei-lesson .lrmei-hero h1 {
  color: #fff;
  font-family: Inter, "Noto Sans SC", "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  font-size: clamp(3rem, 6vw, 5.2rem);
  font-weight: 800;
  letter-spacing: -0.045em;
  line-height: 1.05;
  margin: 0 0 12px;
}

.lrmei-lesson .lrmei-hero-en {
  color: #f2bd55;
  font-size: clamp(1.18rem, 2.4vw, 1.62rem);
  font-weight: 720;
  margin: 0 0 26px;
}

.lrmei-lesson .lrmei-hero .lrmei-zh,
.lrmei-lesson .lrmei-hero > .lrmei-support-en {
  max-width: 54%;
}

.lrmei-lesson .lrmei-hero .lrmei-zh {
  color: #eff9fc;
  font-size: 1.03em;
  margin: 20px 0 8px;
}

.lrmei-lesson .lrmei-hero > .lrmei-support-en:not(.lrmei-hero-en) {
  color: #b9deeb;
  font-size: 0.9em;
  margin: 0;
}

.lrmei-lesson .lrmei-panel {
  background: #fff;
  border: 1px solid var(--lrmei-border);
  border-radius: 20px;
  box-shadow: var(--lrmei-shadow);
  margin: 0 0 24px;
  padding: clamp(22px, 4vw, 42px);
  position: relative;
}

.lrmei-lesson .lrmei-section-number {
  align-items: center;
  background: #e8f2f7;
  border-radius: 999px;
  color: var(--lrmei-blue);
  display: inline-flex;
  font-size: 0.78rem;
  font-weight: 800;
  height: 36px;
  justify-content: center;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
  min-width: 72px;
  padding: 0 12px;
}

.lrmei-lesson h2 {
  color: var(--lrmei-navy);
  font-family: "Noto Serif SC", "Songti SC", "SimSun", Georgia, serif;
  font-size: clamp(1.45rem, 3vw, 2.05rem);
  line-height: 1.3;
  margin: 0 0 18px;
}

.lrmei-lesson h2 .lrmei-support-en {
  color: var(--lrmei-muted);
  display: block;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  font-size: 0.52em;
  font-weight: 650;
  margin-top: 5px;
}

.lrmei-lesson h3 {
  color: var(--lrmei-navy);
  font-size: 1.08rem;
  line-height: 1.45;
  margin: 0 0 14px;
}

.lrmei-lesson h3 .lrmei-support-en {
  color: var(--lrmei-muted);
  display: block;
  font-size: 0.82em;
  font-weight: 600;
  margin-top: 3px;
}

.lrmei-lesson p {
  margin: 0 0 13px;
}

.lrmei-lesson .lrmei-zh {
  color: var(--lrmei-ink);
  font-family: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: 1.04em;
}

.lrmei-lesson .lrmei-support-en {
  color: var(--lrmei-muted);
  font-size: 0.92em;
}

.lrmei-lesson.lrmei-hide-support .lrmei-support-en {
  display: none !important;
}

.lrmei-lesson .lrmei-goals {
  border-top: 5px solid var(--lrmei-gold);
}

.lrmei-lesson .lrmei-goal-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.lrmei-lesson .lrmei-goal-card {
  background: var(--lrmei-canvas);
  border: 1px solid var(--lrmei-border);
  border-radius: 14px;
  min-height: 154px;
  padding: 18px;
}

.lrmei-lesson .lrmei-goal-card > span {
  align-items: center;
  background: var(--lrmei-navy);
  border-radius: 999px;
  color: #fff;
  display: flex;
  font-size: 0.82rem;
  font-weight: 800;
  height: 30px;
  justify-content: center;
  margin-bottom: 12px;
  min-width: 54px;
  padding: 0 9px;
}

.lrmei-lesson .lrmei-goal-card strong,
.lrmei-lesson .lrmei-goal-card small {
  display: block;
}

.lrmei-lesson .lrmei-goal-card strong {
  color: var(--lrmei-navy);
  line-height: 1.45;
}

.lrmei-lesson .lrmei-goal-card small {
  color: var(--lrmei-muted);
  font-size: 0.76rem;
  line-height: 1.4;
  margin-top: 7px;
}

.lrmei-lesson .lrmei-compare-grid,
.lrmei-lesson .lrmei-example-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 22px 0;
}

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

.lrmei-lesson .lrmei-language-card {
  border: 1px solid var(--lrmei-border);
  border-radius: 16px;
  min-width: 0;
  padding: 22px;
  text-align: center;
}

.lrmei-lesson .lrmei-mandarin-card {
  background: #fff2f0;
  border-top: 5px solid var(--lrmei-red);
}

.lrmei-lesson .lrmei-english-card {
  background: #eef7fb;
  border-top: 5px solid var(--lrmei-blue);
}

.lrmei-lesson .lrmei-card-label {
  color: var(--lrmei-muted);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.lrmei-lesson .lrmei-big-example {
  color: var(--lrmei-navy);
  font-family: "Noto Serif SC", "Songti SC", "SimSun", Georgia, serif;
  font-size: clamp(3.5rem, 9vw, 6.2rem);
  font-weight: 800;
  line-height: 1.25;
  margin: 12px 0;
}

.lrmei-lesson .lrmei-word-build {
  display: flex;
  flex-wrap: wrap;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  font-size: clamp(2rem, 6vw, 4.4rem);
  gap: 4px;
  justify-content: center;
  text-transform: lowercase;
}

.lrmei-lesson .lrmei-word-build span {
  align-items: center;
  background: #fff;
  border: 1px solid #c9dce7;
  border-radius: 8px;
  display: flex;
  height: 1.25em;
  justify-content: center;
  width: 0.9em;
}

.lrmei-lesson .lrmei-note {
  background: #fff8e8;
  border-left: 5px solid var(--lrmei-gold);
  border-radius: 10px;
  color: #594519;
  margin: 22px 0 0;
  padding: 16px 18px;
}

.lrmei-lesson .lrmei-tone-row {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin: 22px 0;
}

.lrmei-lesson .lrmei-tone-row > div {
  align-items: center;
  background: #fff7f5;
  border: 1px solid #f0d7d2;
  border-radius: 14px;
  display: flex;
  flex-direction: column;
  padding: 16px 10px;
  text-align: center;
}

.lrmei-lesson .lrmei-tone-row b {
  color: var(--lrmei-red);
  font-family: "Noto Serif SC", "Songti SC", "SimSun", serif;
  font-size: 2.5rem;
  line-height: 1.2;
}

.lrmei-lesson .lrmei-tone-row small {
  color: var(--lrmei-muted);
  display: block;
  font-size: 0.76rem;
  margin: 4px 0 10px;
}

.lrmei-lesson .lrmei-example-card,
.lrmei-lesson .lrmei-structure-card,
.lrmei-lesson .lrmei-difference-list article {
  background: var(--lrmei-canvas);
  border: 1px solid var(--lrmei-border);
  border-radius: 15px;
  min-width: 0;
  padding: 20px;
}

.lrmei-lesson .lrmei-example-card {
  position: relative;
}

.lrmei-lesson .lrmei-intonation {
  align-items: center;
  border-radius: 50%;
  color: #fff;
  display: flex;
  font-size: 1.55rem;
  font-weight: 800;
  height: 44px;
  justify-content: center;
  position: absolute;
  right: 16px;
  top: 16px;
  width: 44px;
}

.lrmei-lesson .lrmei-falling {
  background: var(--lrmei-blue);
}

.lrmei-lesson .lrmei-rising {
  background: var(--lrmei-red);
}

.lrmei-lesson .lrmei-example-zh {
  color: var(--lrmei-navy);
  font-family: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: 1.13rem;
  font-weight: 720;
  line-height: 1.55;
  margin: 0 52px 5px 0;
}

.lrmei-lesson .lrmei-example-en {
  color: #152534;
  font-size: 1.08rem;
  font-weight: 700;
  line-height: 1.48;
  margin: 0 0 10px;
}

.lrmei-lesson .lrmei-explanation {
  color: var(--lrmei-muted);
  font-size: 0.88rem;
  line-height: 1.55;
}

.lrmei-lesson .lrmei-audio-row {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 13px;
}

.lrmei-lesson .lrmei-audio-button {
  align-items: center;
  appearance: none;
  background: #fff;
  border: 1px solid #b9cbd6;
  border-radius: 999px;
  box-shadow: 0 2px 5px rgba(23, 50, 77, 0.08);
  color: var(--lrmei-navy);
  cursor: pointer;
  display: inline-flex;
  font-family: inherit;
  font-size: 0.79rem;
  font-weight: 760;
  gap: 6px;
  line-height: 1;
  min-height: 36px;
  padding: 8px 12px;
  transition: background 150ms ease, border-color 150ms ease, color 150ms ease, transform 150ms ease;
}

.lrmei-lesson .lrmei-audio-button:hover {
  background: #eaf4f8;
  border-color: var(--lrmei-blue);
  transform: translateY(-1px);
}

.lrmei-lesson .lrmei-audio-button:focus-visible {
  outline: 3px solid rgba(45, 106, 139, 0.33);
  outline-offset: 2px;
}

.lrmei-lesson .lrmei-audio-button.lrmei-playing {
  background: var(--lrmei-navy);
  border-color: var(--lrmei-navy);
  color: #fff;
}

.lrmei-lesson .lrmei-audio-button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.lrmei-lesson .lrmei-speaker {
  font-size: 0.95rem;
}

.lrmei-lesson .lrmei-homophone-group {
  border-top: 1px dashed #c7d3dc;
  margin-top: 26px;
  padding-top: 24px;
}

.lrmei-lesson .lrmei-homophone-group h3 span {
  background: #e8f2f7;
  border-radius: 7px;
  color: var(--lrmei-blue);
  display: inline-block;
  padding: 2px 8px;
}

.lrmei-lesson .lrmei-small-note {
  background: #f8fafb;
  border-radius: 10px;
  font-size: 0.88rem;
  margin-top: 14px;
  padding: 12px 14px;
}

.lrmei-lesson .lrmei-pronunciation-hint {
  color: var(--lrmei-red);
  display: block;
  font-size: 0.82rem;
  font-weight: 700;
  margin-top: 5px;
}

.lrmei-lesson .lrmei-word-source-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 22px 0;
}

.lrmei-lesson .lrmei-word-source-grid > div {
  background: #eef5f8;
  border-left: 4px solid var(--lrmei-blue);
  border-radius: 10px;
  padding: 15px 17px;
}

.lrmei-lesson .lrmei-word-source-grid b,
.lrmei-lesson .lrmei-word-source-grid span {
  display: block;
}

.lrmei-lesson .lrmei-word-source-grid b {
  color: var(--lrmei-navy);
  margin-bottom: 5px;
}

.lrmei-lesson .lrmei-word-source-grid span {
  color: var(--lrmei-muted);
  font-size: 0.86rem;
}

.lrmei-lesson .lrmei-word-source-grid .lrmei-audio-row {
  margin-top: 12px;
}

.lrmei-lesson .lrmei-word-source-grid .lrmei-audio-button span {
  color: inherit;
  font-size: inherit;
}

.lrmei-lesson .lrmei-wide-example {
  margin: 20px 0 0;
}

.lrmei-lesson .lrmei-structure-card {
  background: linear-gradient(135deg, #eef7fb, #f8fbfc);
  border-top: 5px solid var(--lrmei-blue);
  margin: 22px 0;
  text-align: center;
}

.lrmei-lesson .lrmei-formula {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin: 0 0 16px;
}

.lrmei-lesson .lrmei-formula span {
  background: #fff;
  border: 1px solid #c9dce7;
  border-radius: 9px;
  color: var(--lrmei-navy);
  font-size: 0.86rem;
  font-weight: 750;
  padding: 8px 12px;
}

.lrmei-lesson mark {
  background: #fff0b8;
  border-radius: 5px;
  color: inherit;
  padding: 1px 5px;
}

.lrmei-lesson .lrmei-difference-list {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 24px;
}

.lrmei-lesson .lrmei-difference-list article {
  background: #fff;
  border-top: 4px solid #c4dce8;
  padding-top: 18px;
}

.lrmei-lesson .lrmei-difference-label {
  align-items: center;
  background: var(--lrmei-blue);
  border-radius: 999px;
  color: #fff;
  display: flex;
  font-size: 0.78rem;
  font-weight: 800;
  height: 28px;
  justify-content: center;
  margin-bottom: 10px;
  min-width: 54px;
  padding: 0 9px;
}

.lrmei-lesson .lrmei-ending-block {
  border-top: 1px dashed #c7d3dc;
  margin-top: 28px;
  padding-top: 24px;
}

.lrmei-lesson .lrmei-ending-block h4 {
  color: var(--lrmei-navy);
  font-size: 1rem;
  line-height: 1.45;
  margin: 0 0 12px;
}

.lrmei-lesson .lrmei-ending-block h4 .lrmei-support-en {
  display: block;
  font-size: 0.78em;
  margin-top: 3px;
}

.lrmei-lesson .lrmei-ending-rule-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 20px;
}

.lrmei-lesson .lrmei-spelling-row {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin: 20px 0;
}

.lrmei-lesson .lrmei-spelling-row > span {
  background: #eef5f8;
  border: 1px solid #d5e4ec;
  border-radius: 10px;
  color: var(--lrmei-navy);
  font-weight: 760;
  padding: 13px;
  text-align: center;
}

.lrmei-lesson .lrmei-spelling-row small {
  color: var(--lrmei-muted);
  font-size: 0.75rem;
  font-weight: 600;
}

.lrmei-lesson .lrmei-practice {
  border-top: 5px solid var(--lrmei-green);
}

.lrmei-lesson .lrmei-practice-list,
.lrmei-lesson .lrmei-summary-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
}

.lrmei-lesson .lrmei-practice-list {
  counter-reset: lrmei-practice;
}

.lrmei-lesson .lrmei-practice-list li {
  background: #f2f8f5;
  border: 1px solid #d4e8dd;
  border-radius: 13px;
  counter-increment: lrmei-practice;
  margin: 0 0 12px;
  padding: 15px 16px 15px 74px;
  position: relative;
}

.lrmei-lesson .lrmei-practice-list li::before {
  align-items: center;
  background: var(--lrmei-green);
  border-radius: 999px;
  color: #fff;
  content: attr(data-number);
  display: flex;
  font-size: 0.78rem;
  font-weight: 800;
  height: 30px;
  justify-content: center;
  left: 15px;
  position: absolute;
  top: 15px;
  width: 46px;
}

.lrmei-lesson .lrmei-practice-list li > .lrmei-support-en {
  display: block;
  margin-top: 2px;
}

.lrmei-lesson .lrmei-summary {
  background: #f7fafc;
  border-top: 5px solid var(--lrmei-navy);
}

.lrmei-lesson .lrmei-summary-list {
  counter-reset: lrmei-summary;
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.lrmei-lesson .lrmei-summary-list li {
  background: #fff;
  border: 1px solid var(--lrmei-border);
  border-radius: 12px;
  counter-increment: lrmei-summary;
  min-height: 112px;
  padding: 16px 16px 16px 74px;
  position: relative;
}

.lrmei-lesson .lrmei-summary-list li::before {
  align-items: center;
  background: var(--lrmei-navy);
  border-radius: 999px;
  color: #fff;
  content: attr(data-number);
  display: flex;
  font-size: 0.75rem;
  font-weight: 800;
  height: 28px;
  justify-content: center;
  left: 15px;
  position: absolute;
  top: 17px;
  width: 46px;
}

.lrmei-lesson .lrmei-summary-list span,
.lrmei-lesson .lrmei-summary-list small {
  display: block;
}

.lrmei-lesson .lrmei-summary-list span {
  color: var(--lrmei-navy);
  font-weight: 690;
  line-height: 1.55;
}

.lrmei-lesson .lrmei-summary-list small {
  color: var(--lrmei-muted);
  font-size: 0.78rem;
  line-height: 1.5;
  margin-top: 6px;
}

.lrmei-lesson .lrmei-finish-message {
  background: linear-gradient(135deg, var(--lrmei-navy), #245979);
  border-radius: 16px;
  color: #fff;
  margin-top: 22px;
  padding: 22px;
  text-align: center;
}

.lrmei-lesson .lrmei-finish-message strong {
  font-size: 1.16rem;
}

.lrmei-lesson .lrmei-finish-message p {
  color: #e6f0f5;
  margin: 6px auto 0;
  max-width: 760px;
}

.lrmei-lesson .lrmei-lesson-navigation {
  background: #eef5f8;
  border: 1px solid #d5e4ec;
  border-radius: 16px;
  margin-top: 22px;
  padding: 20px;
  text-align: center;
}

.lrmei-lesson .lrmei-next-button {
  align-items: center;
  background: var(--lrmei-blue);
  border-radius: 999px;
  color: #fff;
  display: inline-flex;
  font-weight: 800;
  gap: 10px;
  justify-content: center;
  min-height: 48px;
  padding: 10px 22px;
  text-decoration: none;
}

.lrmei-lesson .lrmei-next-button:hover,
.lrmei-lesson .lrmei-next-button:focus {
  background: var(--lrmei-navy);
  color: #fff;
}

.lrmei-lesson .lrmei-next-button .lrmei-support-en {
  color: #dcecf4;
  display: block;
  font-size: 0.74rem;
}

.lrmei-lesson .lrmei-lesson-navigation p {
  font-size: 0.82rem;
  margin: 10px auto 0;
  max-width: 720px;
}

.lrmei-lesson .lrmei-jiayou {
  align-items: center;
  background: #fff8e8;
  border: 2px solid #efcf86;
  border-radius: 16px;
  display: flex;
  flex-direction: column;
  margin-top: 18px;
  padding: 22px;
  text-align: center;
}

.lrmei-lesson .lrmei-jiayou > strong {
  color: var(--lrmei-red);
  font-family: "Noto Serif SC", "Songti SC", "SimSun", serif;
  font-size: 2rem;
}

.lrmei-lesson .lrmei-jiayou .lrmei-audio-row {
  justify-content: center;
}

/* Brighter lesson surface and card system. */
.lrmei-lesson .lrmei-panel {
  background: linear-gradient(180deg, #ffffff 0%, #fbfdff 100%);
  border: 1px solid #c9dce8;
  border-top-width: 1px;
  box-shadow:
    0 18px 42px rgba(18, 63, 98, 0.11),
    0 3px 10px rgba(18, 63, 98, 0.06);
  overflow: hidden;
}

.lrmei-lesson .lrmei-panel::before {
  background: linear-gradient(90deg, var(--lrmei-blue), var(--lrmei-aqua), var(--lrmei-gold), var(--lrmei-coral));
  content: "";
  height: 5px;
  left: 0;
  position: absolute;
  right: 0;
  top: 0;
}

.lrmei-lesson .lrmei-goals::before {
  background: linear-gradient(90deg, var(--lrmei-gold), var(--lrmei-coral));
}

.lrmei-lesson .lrmei-practice::before {
  background: linear-gradient(90deg, var(--lrmei-green), var(--lrmei-aqua));
}

.lrmei-lesson .lrmei-summary::before {
  background: linear-gradient(90deg, var(--lrmei-purple), var(--lrmei-blue));
}

.lrmei-lesson .lrmei-section-number {
  background: linear-gradient(135deg, var(--lrmei-blue), var(--lrmei-aqua));
  box-shadow: 0 7px 15px rgba(22, 121, 184, 0.22);
  color: #fff;
}

.lrmei-lesson h2 {
  color: #0f4267;
  font-family: Inter, "Noto Sans SC", "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  font-weight: 800;
}

.lrmei-lesson h2 .lrmei-support-en {
  color: #52778d;
  font-weight: 700;
}

.lrmei-lesson .lrmei-goal-card {
  --lrmei-card-accent: var(--lrmei-blue);
  background: #eef8ff;
  border: 1px solid #abd8ef;
  box-shadow: 0 9px 22px rgba(22, 121, 184, 0.1);
}

.lrmei-lesson .lrmei-goal-card:nth-child(2) {
  --lrmei-card-accent: var(--lrmei-coral);
  background: #fff3f0;
  border-color: #f3c2ba;
}

.lrmei-lesson .lrmei-goal-card:nth-child(3) {
  --lrmei-card-accent: var(--lrmei-gold);
  background: #fff9e9;
  border-color: #efd793;
}

.lrmei-lesson .lrmei-goal-card:nth-child(4) {
  --lrmei-card-accent: var(--lrmei-green);
  background: #effaf6;
  border-color: #b6dfd0;
}

.lrmei-lesson .lrmei-goal-card > span {
  background: var(--lrmei-card-accent);
  box-shadow: 0 5px 12px rgba(18, 63, 98, 0.15);
}

.lrmei-lesson .lrmei-language-card {
  box-shadow: 0 12px 26px rgba(18, 63, 98, 0.1);
}

.lrmei-lesson .lrmei-mandarin-card {
  background: linear-gradient(160deg, #fff0ed 0%, #fff9f7 100%);
  border-color: #f2bcb4;
  border-top-color: var(--lrmei-coral);
}

.lrmei-lesson .lrmei-english-card {
  background: linear-gradient(160deg, #eaf8ff 0%, #f6fcff 100%);
  border-color: #acd9ee;
  border-top-color: var(--lrmei-blue);
}

.lrmei-lesson .lrmei-word-build span {
  border-color: #9ed3eb;
  box-shadow: 0 5px 12px rgba(22, 121, 184, 0.1);
}

.lrmei-lesson .lrmei-note {
  background: linear-gradient(135deg, #fff7d9, #fffaf0);
  border: 1px solid #ebcc72;
  border-left: 6px solid var(--lrmei-gold);
  box-shadow: 0 8px 20px rgba(239, 173, 47, 0.11);
}

.lrmei-lesson .lrmei-tone-row > div {
  --lrmei-tone-accent: var(--lrmei-red);
  background: #fff2ef;
  border: 1px solid #f2c0b8;
  border-top: 4px solid var(--lrmei-tone-accent);
  box-shadow: 0 8px 18px rgba(238, 98, 89, 0.08);
}

.lrmei-lesson .lrmei-tone-row > div:nth-child(2) {
  --lrmei-tone-accent: var(--lrmei-gold);
  background: #fff9e8;
  border-color: #eed895;
}

.lrmei-lesson .lrmei-tone-row > div:nth-child(3) {
  --lrmei-tone-accent: var(--lrmei-green);
  background: #effaf6;
  border-color: #b8dfd1;
}

.lrmei-lesson .lrmei-tone-row > div:nth-child(4) {
  --lrmei-tone-accent: var(--lrmei-purple);
  background: #f4f1ff;
  border-color: #cfc5f1;
}

.lrmei-lesson .lrmei-tone-row b {
  color: var(--lrmei-tone-accent);
}

.lrmei-lesson .lrmei-example-card,
.lrmei-lesson .lrmei-structure-card,
.lrmei-lesson .lrmei-difference-list article {
  background: #fff;
  border: 1px solid #c9dfea;
  border-left: 5px solid var(--lrmei-aqua);
  box-shadow: 0 9px 22px rgba(18, 63, 98, 0.09);
}

.lrmei-lesson .lrmei-example-grid .lrmei-example-card:nth-child(even) {
  border-left-color: var(--lrmei-coral);
}

.lrmei-lesson .lrmei-three-grid .lrmei-example-card:nth-child(3n) {
  border-left-color: var(--lrmei-gold);
}

.lrmei-lesson .lrmei-falling {
  background: linear-gradient(135deg, var(--lrmei-blue), var(--lrmei-aqua));
  box-shadow: 0 6px 14px rgba(22, 121, 184, 0.2);
}

.lrmei-lesson .lrmei-rising {
  background: linear-gradient(135deg, var(--lrmei-red), #f69a72);
  box-shadow: 0 6px 14px rgba(238, 98, 89, 0.2);
}

.lrmei-lesson .lrmei-audio-button {
  background: #f5fbff;
  border-color: #9fcde3;
  box-shadow: 0 5px 12px rgba(18, 63, 98, 0.1);
  color: #104d77;
}

.lrmei-lesson .lrmei-audio-button:hover {
  background: #e0f4ff;
  border-color: var(--lrmei-blue);
  box-shadow: 0 8px 18px rgba(22, 121, 184, 0.16);
}

.lrmei-lesson .lrmei-audio-button.lrmei-playing {
  background: linear-gradient(135deg, var(--lrmei-blue), var(--lrmei-aqua));
  border-color: var(--lrmei-blue);
}

.lrmei-lesson .lrmei-homophone-group {
  border-top-color: #a9cee0;
}

.lrmei-lesson .lrmei-small-note {
  background: #f1f9fd;
  border: 1px solid #c8e2ee;
}

.lrmei-lesson .lrmei-word-source-grid > div {
  --lrmei-source-accent: var(--lrmei-blue);
  background: #eef8ff;
  border: 1px solid #c4dfec;
  border-left: 5px solid var(--lrmei-source-accent);
  box-shadow: 0 7px 17px rgba(18, 63, 98, 0.07);
}

.lrmei-lesson .lrmei-word-source-grid > div:nth-child(4n + 2) {
  --lrmei-source-accent: var(--lrmei-coral);
  background: #fff3f0;
  border-color: #f0c8c1;
}

.lrmei-lesson .lrmei-word-source-grid > div:nth-child(4n + 3) {
  --lrmei-source-accent: var(--lrmei-gold);
  background: #fff9e9;
  border-color: #ecd99e;
}

.lrmei-lesson .lrmei-word-source-grid > div:nth-child(4n) {
  --lrmei-source-accent: var(--lrmei-green);
  background: #effaf6;
  border-color: #bcdfd2;
}

.lrmei-lesson .lrmei-structure-card {
  background: linear-gradient(135deg, #eaf8ff 0%, #effbf7 100%);
  border: 1px solid #a9d9e4;
  border-top: 5px solid var(--lrmei-aqua);
}

.lrmei-lesson .lrmei-formula span {
  border-color: #a8d6e7;
  box-shadow: 0 5px 12px rgba(18, 63, 98, 0.08);
}

.lrmei-lesson mark {
  background: #ffe798;
  box-shadow: inset 0 -1px 0 #e5bd3f;
}

.lrmei-lesson .lrmei-difference-list article {
  --lrmei-difference-accent: var(--lrmei-blue);
  border-left: 1px solid #c9dfea;
  border-top: 5px solid var(--lrmei-difference-accent);
}

.lrmei-lesson .lrmei-difference-list article:nth-child(even) {
  --lrmei-difference-accent: var(--lrmei-coral);
}

.lrmei-lesson .lrmei-difference-list article:nth-child(3n) {
  --lrmei-difference-accent: var(--lrmei-gold);
}

.lrmei-lesson .lrmei-difference-label {
  background: var(--lrmei-difference-accent);
  box-shadow: 0 5px 12px rgba(18, 63, 98, 0.12);
}

.lrmei-lesson .lrmei-spelling-row > span {
  --lrmei-spelling-accent: var(--lrmei-blue);
  background: #eef8ff;
  border: 1px solid #b9ddea;
  border-bottom: 4px solid var(--lrmei-spelling-accent);
  box-shadow: 0 7px 16px rgba(18, 63, 98, 0.07);
}

.lrmei-lesson .lrmei-spelling-row > span:nth-child(2) {
  --lrmei-spelling-accent: var(--lrmei-coral);
  background: #fff3f0;
}

.lrmei-lesson .lrmei-spelling-row > span:nth-child(3) {
  --lrmei-spelling-accent: var(--lrmei-gold);
  background: #fff9e9;
}

.lrmei-lesson .lrmei-spelling-row > span:nth-child(4) {
  --lrmei-spelling-accent: var(--lrmei-green);
  background: #effaf6;
}

.lrmei-lesson .lrmei-practice-list li {
  background: linear-gradient(90deg, #effaf6, #fbfffd);
  border: 1px solid #b9dfd1;
  border-left: 5px solid var(--lrmei-green);
  box-shadow: 0 7px 17px rgba(36, 150, 111, 0.08);
}

.lrmei-lesson .lrmei-practice-list li::before {
  background: linear-gradient(135deg, var(--lrmei-green), var(--lrmei-aqua));
  box-shadow: 0 5px 12px rgba(36, 150, 111, 0.18);
}

.lrmei-lesson .lrmei-summary {
  background: linear-gradient(180deg, #f6f4ff 0%, #f9fcff 100%);
}

.lrmei-lesson .lrmei-summary-list li {
  border: 1px solid #cfc9ed;
  border-left: 5px solid var(--lrmei-purple);
  box-shadow: 0 8px 18px rgba(120, 101, 199, 0.09);
}

.lrmei-lesson .lrmei-summary-list li:nth-child(even) {
  border-left-color: var(--lrmei-blue);
}

.lrmei-lesson .lrmei-summary-list li::before {
  background: linear-gradient(135deg, var(--lrmei-purple), var(--lrmei-blue));
  box-shadow: 0 5px 12px rgba(120, 101, 199, 0.18);
}

.lrmei-lesson .lrmei-finish-message {
  background: linear-gradient(135deg, #145b8c 0%, #15899a 100%);
  border: 1px solid #4ab4c0;
  box-shadow: 0 12px 28px rgba(20, 91, 140, 0.2);
}

.lrmei-lesson .lrmei-lesson-navigation {
  background: linear-gradient(135deg, #edf8ff, #f4fbff);
  border: 1px solid #a9d8ed;
  box-shadow: 0 9px 22px rgba(22, 121, 184, 0.1);
}

.lrmei-lesson .lrmei-next-button {
  background: linear-gradient(135deg, var(--lrmei-blue), var(--lrmei-aqua));
  box-shadow: 0 8px 18px rgba(22, 121, 184, 0.22);
}

.lrmei-lesson .lrmei-next-button:hover,
.lrmei-lesson .lrmei-next-button:focus {
  background: linear-gradient(135deg, #0f5e91, #127f8d);
  transform: translateY(-1px);
}

.lrmei-lesson .lrmei-jiayou {
  background: linear-gradient(135deg, #fff5cf, #fff3ec);
  border-color: #ecc35b;
  box-shadow: 0 10px 24px rgba(239, 173, 47, 0.12);
}

.lrmei-lesson .lrmei-jiayou > strong {
  color: var(--lrmei-coral);
}

@media (max-width: 900px) {
  .lrmei-lesson .lrmei-hero {
    background:
      linear-gradient(90deg, rgba(4, 28, 48, 0.99) 0%, rgba(4, 28, 48, 0.96) 48%, rgba(4, 28, 48, 0.62) 68%, rgba(4, 28, 48, 0.08) 100%),
      url("../images/lesson-1-1-hero.webp") 64% center / cover no-repeat;
  }

  .lrmei-lesson .lrmei-hero > *,
  .lrmei-lesson .lrmei-hero .lrmei-zh,
  .lrmei-lesson .lrmei-hero > .lrmei-support-en {
    max-width: 60%;
  }

  .lrmei-lesson .lrmei-goal-grid,
  .lrmei-lesson .lrmei-three-grid,
  .lrmei-lesson .lrmei-ending-rule-grid,
  .lrmei-lesson .lrmei-spelling-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 700px) {
  .lrmei-lesson {
    font-size: 16px;
  }

  .lrmei-lesson .lrmei-hero {
    background:
      linear-gradient(180deg, rgba(4, 28, 48, 1) 0%, rgba(4, 28, 48, 0.98) 54%, rgba(4, 28, 48, 0.68) 70%, rgba(4, 28, 48, 0.06) 100%),
      url("../images/lesson-1-1-hero.webp") right bottom / auto 54% no-repeat;
    min-height: 720px;
    padding-bottom: 300px;
  }

  .lrmei-lesson .lrmei-hero > *,
  .lrmei-lesson .lrmei-hero .lrmei-zh,
  .lrmei-lesson .lrmei-hero > .lrmei-support-en {
    max-width: 100%;
  }

  .lrmei-lesson .lrmei-hero h1 {
    font-size: clamp(2.8rem, 15vw, 4.3rem);
  }

  .lrmei-lesson .lrmei-hero::after {
    width: 62%;
  }

  .lrmei-lesson .lrmei-hero,
  .lrmei-lesson .lrmei-panel {
    border-radius: 16px;
  }

  .lrmei-lesson .lrmei-goal-grid,
  .lrmei-lesson .lrmei-compare-grid,
  .lrmei-lesson .lrmei-example-grid,
  .lrmei-lesson .lrmei-three-grid,
  .lrmei-lesson .lrmei-word-source-grid,
  .lrmei-lesson .lrmei-difference-list,
  .lrmei-lesson .lrmei-ending-rule-grid,
  .lrmei-lesson .lrmei-spelling-row,
  .lrmei-lesson .lrmei-summary-list {
    grid-template-columns: 1fr;
  }

  .lrmei-lesson .lrmei-tone-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .lrmei-lesson .lrmei-goal-card,
  .lrmei-lesson .lrmei-summary-list li {
    min-height: 0;
  }
}

@media (max-width: 430px) {
  .lrmei-lesson .lrmei-hero {
    min-height: 680px;
    padding: 20px 16px 260px;
  }

  .lrmei-lesson .lrmei-hero::after {
    left: 16px;
    top: 58px;
  }

  .lrmei-lesson .lrmei-hero,
  .lrmei-lesson .lrmei-panel {
    padding: 20px 16px;
  }

  .lrmei-lesson .lrmei-hero {
    padding-bottom: 260px;
  }

  .lrmei-lesson .lrmei-tone-row {
    grid-template-columns: 1fr 1fr;
  }

  .lrmei-lesson .lrmei-audio-button {
    justify-content: center;
    min-height: 40px;
  }

  .lrmei-lesson .lrmei-example-card,
  .lrmei-lesson .lrmei-structure-card,
  .lrmei-lesson .lrmei-difference-list article {
    padding: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .lrmei-lesson .lrmei-audio-button {
    transition: none;
  }
}