:root {
  --lesson-ink: #10231e;
  --lesson-muted: #5b706a;
  --lesson-green: #087f5b;
  --lesson-deep: #063f35;
  --lesson-lime: #a3e635;
  --lesson-cream: #fffdf7;
  --lesson-line: rgba(16, 35, 30, 0.1);
  --lesson-shadow: 0 18px 48px rgba(7, 63, 53, 0.12);
}

body.starter-lesson-page {
  color: var(--lesson-ink);
}

.starter-lesson-main {
  padding: 20px clamp(14px, 3vw, 34px) 70px;
}

.starter-lesson-topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  margin: -4px 0 16px;
  padding: 10px 12px;
  background: rgba(244, 255, 248, 0.9);
  border: 1px solid rgba(8, 127, 91, 0.12);
  border-radius: 16px;
  box-shadow: 0 10px 28px rgba(7, 63, 53, 0.08);
  backdrop-filter: blur(16px);
}

.starter-back-link {
  color: #075943;
  font-size: 13px;
  font-weight: 900;
  text-decoration: none;
}

.starter-scroll-progress {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: min(330px, 52vw);
  color: var(--lesson-muted);
  font-size: 11px;
  font-weight: 800;
}

.starter-scroll-track {
  flex: 1;
  height: 7px;
  overflow: hidden;
  background: rgba(8, 127, 91, 0.12);
  border-radius: 999px;
}

#starter-scroll-bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--lesson-green), #65a30d);
  border-radius: inherit;
  transition: width 0.15s ease;
}

.starter-loading-card,
.starter-error-card {
  display: flex;
  align-items: center;
  gap: 14px;
  max-width: 680px;
  margin: 80px auto;
  padding: 22px;
  background: #fff;
  border: 1px solid var(--lesson-line);
  border-radius: 20px;
  box-shadow: var(--lesson-shadow);
}

.starter-loading-card p,
.starter-error-card p {
  margin: 5px 0 0;
  color: var(--lesson-muted);
}

.starter-loading-dot {
  width: 18px;
  height: 18px;
  border: 3px solid rgba(8, 127, 91, 0.18);
  border-top-color: var(--lesson-green);
  border-radius: 50%;
  animation: starter-spin 0.8s linear infinite;
}

@keyframes starter-spin {
  to { transform: rotate(360deg); }
}

.starter-lesson-hero {
  position: relative;
  overflow: hidden;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 28px;
  align-items: end;
  padding: clamp(28px, 5vw, 56px);
  color: #fff;
  background:
    radial-gradient(circle at 88% 12%, rgba(255, 255, 255, 0.2), transparent 24%),
    linear-gradient(135deg, #073b34, #087f5b 58%, #65a30d);
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 30px;
  box-shadow: 0 28px 70px rgba(5, 75, 55, 0.24);
}

.starter-lesson-hero::after {
  content: "";
  position: absolute;
  right: -100px;
  bottom: -170px;
  width: 300px;
  height: 300px;
  border: 46px solid rgba(255, 255, 255, 0.09);
  border-radius: 50%;
}

.starter-kicker,
.starter-section-kicker {
  display: block;
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.starter-kicker {
  margin-bottom: 12px;
  color: #d9f99d;
}

.starter-lesson-hero h1 {
  max-width: 850px;
  margin: 0;
  color: #fff;
  font-size: clamp(36px, 6vw, 68px);
  line-height: 0.98;
  letter-spacing: -0.05em;
}

.starter-lesson-hero p {
  max-width: 760px;
  margin: 16px 0 0;
  color: rgba(255, 255, 255, 0.82);
  font-size: clamp(15px, 2vw, 18px);
  line-height: 1.6;
}

.starter-hero-meta {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, minmax(94px, 1fr));
  gap: 10px;
}

.starter-meta-pill {
  min-width: 104px;
  padding: 16px;
  text-align: center;
  background: rgba(255, 255, 255, 0.13);
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 18px;
  backdrop-filter: blur(12px);
}

.starter-meta-pill strong {
  display: block;
  font-size: 26px;
  line-height: 1;
}

.starter-meta-pill span {
  display: block;
  margin-top: 6px;
  color: rgba(255, 255, 255, 0.72);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.starter-objectives {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 14px;
}

.starter-objective {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 14px;
  color: #17483d;
  font-size: 13px;
  font-weight: 750;
  line-height: 1.4;
  background: rgba(255, 253, 247, 0.92);
  border: 1px solid rgba(8, 127, 91, 0.12);
  border-radius: 16px;
}

.starter-objective::before {
  content: "✓";
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  flex: 0 0 auto;
  color: #047857;
  background: #d1fae5;
  border-radius: 50%;
}

.starter-lesson-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 250px;
  gap: 22px;
  align-items: start;
  min-width: 0;
  margin-top: 24px;
}

.starter-lesson-content {
  min-width: 0;
}

.starter-toc {
  position: sticky;
  top: 76px;
  min-width: 0;
  max-width: 100%;
  padding: 16px;
  background: rgba(255, 253, 247, 0.96);
  border: 1px solid rgba(8, 127, 91, 0.14);
  border-radius: 20px;
  box-shadow: 0 15px 38px rgba(7, 63, 53, 0.1);
}

.starter-toc h2 {
  margin: 0 0 12px;
  font-size: 16px;
}

.starter-toc-list {
  display: grid;
  gap: 5px;
}

.starter-toc-link {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 8px;
  align-items: center;
  padding: 8px;
  color: #46625a;
  font-size: 12px;
  font-weight: 750;
  text-decoration: none;
  border-radius: 10px;
  transition: background 0.18s ease, color 0.18s ease;
}

.starter-toc-link:hover,
.starter-toc-link.is-active {
  color: #075943;
  background: #ecfccb;
}

.starter-toc-number {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  color: #fff;
  font-size: 10px;
  font-weight: 900;
  background: var(--lesson-green);
  border-radius: 9px;
}

.starter-intro-card,
.starter-rule-card,
.starter-pronunciation-card,
.starter-summary-card,
.starter-quiz-card,
.starter-finish-card {
  margin-bottom: 18px;
  background: rgba(255, 253, 247, 0.97);
  border: 1px solid var(--lesson-line);
  border-radius: 24px;
  box-shadow: var(--lesson-shadow);
}

.starter-intro-card {
  padding: clamp(22px, 4vw, 38px);
}

.starter-intro-card h2,
.starter-summary-card h2,
.starter-quiz-card h2,
.starter-finish-card h2 {
  margin: 0;
  font-size: clamp(25px, 4vw, 36px);
  line-height: 1.08;
  letter-spacing: -0.035em;
}

.starter-intro-card > p,
.starter-finish-card p {
  color: var(--lesson-muted);
  font-size: 16px;
  line-height: 1.7;
}

.starter-conversation {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  margin: 22px 0;
  padding: 18px;
  background: linear-gradient(135deg, #ecfdf5, #f7fee7);
  border: 1px solid #bbf7d0;
  border-radius: 18px;
}

.starter-teacher-avatar {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  color: #fff;
  font-weight: 900;
  background: linear-gradient(145deg, var(--lesson-green), #65a30d);
  border-radius: 14px;
}

.starter-conversation strong {
  display: block;
  margin-bottom: 4px;
  color: #075943;
}

.starter-conversation p {
  margin: 0;
  color: #31594e;
  line-height: 1.55;
}

.starter-anchor-example {
  padding: 18px;
  background: #0b2f29;
  border-radius: 18px;
}

.starter-example-en {
  color: #fff;
  font-size: clamp(19px, 3vw, 25px);
  font-weight: 850;
  line-height: 1.3;
}

.starter-example-en mark {
  color: #d9f99d;
  background: transparent;
}

.starter-example-uz {
  margin-top: 6px;
  color: rgba(255, 255, 255, 0.68);
  line-height: 1.45;
}

.starter-example-note {
  margin-top: 12px;
  padding-top: 12px;
  color: #bbf7d0;
  font-size: 13px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.starter-comparison-grid,
.starter-group-grid,
.starter-example-grid,
.starter-summary-grid,
.starter-pronunciation-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.starter-comparison-box,
.starter-group-box {
  padding: 17px;
  background: #fff;
  border: 1px solid var(--lesson-line);
  border-radius: 17px;
}

.starter-comparison-box strong,
.starter-group-box strong {
  display: block;
  margin-bottom: 10px;
  color: #075943;
}

.starter-chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.starter-chip {
  padding: 7px 9px;
  color: #334b44;
  font-size: 12px;
  font-weight: 800;
  background: #f1f5f2;
  border-radius: 999px;
}

.starter-rule-card {
  scroll-margin-top: 84px;
  overflow: hidden;
}

.starter-rule-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  align-items: center;
  padding: 22px clamp(20px, 4vw, 32px);
  background: linear-gradient(135deg, #f0fdf4, #f7fee7);
  border-bottom: 1px solid rgba(8, 127, 91, 0.1);
}

.starter-rule-number {
  display: grid;
  place-items: center;
  width: 50px;
  height: 50px;
  color: #fff;
  font-size: 16px;
  font-weight: 900;
  background: var(--lesson-green);
  border-radius: 16px;
  box-shadow: 0 10px 22px rgba(8, 127, 91, 0.22);
}

.starter-section-kicker {
  margin-bottom: 5px;
  color: var(--lesson-green);
}

.starter-rule-head h2 {
  margin: 0;
  font-size: clamp(22px, 3vw, 31px);
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.starter-rule-body {
  padding: clamp(20px, 4vw, 32px);
}

.starter-friendly-intro {
  margin: 0 0 20px;
  color: #3f5d54;
  font-size: 16px;
  line-height: 1.7;
}

.starter-rule-core {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(220px, 0.8fr);
  gap: 12px;
}

.starter-rule-box,
.starter-why-box,
.starter-note-box,
.starter-memory-box,
.starter-precision-box {
  padding: 17px;
  border-radius: 17px;
}

.starter-rule-box {
  color: #fff;
  background: #0b2f29;
}

.starter-rule-box span,
.starter-why-box span,
.starter-note-box span,
.starter-memory-box span,
.starter-precision-box span {
  display: block;
  margin-bottom: 7px;
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.starter-rule-box span {
  color: #a7f3d0;
}

.starter-rule-box strong {
  display: block;
  font-size: 18px;
  line-height: 1.45;
}

.starter-pattern {
  display: inline-block;
  margin-top: 12px;
  padding: 8px 10px;
  color: #d9f99d;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 10px;
}

.starter-why-box {
  color: #31594e;
  background: #ecfdf5;
  border: 1px solid #bbf7d0;
}

.starter-why-box span {
  color: #047857;
}

.starter-subsection {
  margin-top: 24px;
}

.starter-subsection h3 {
  margin: 0 0 12px;
  font-size: 17px;
}

.starter-transform-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 9px;
}

.starter-transform {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  gap: 7px;
  align-items: center;
  padding: 12px;
  color: #3b554d;
  font-size: 13px;
  font-weight: 800;
  background: #f7faf8;
  border: 1px solid var(--lesson-line);
  border-radius: 13px;
}

.starter-transform span:last-child {
  color: #047857;
}

.starter-transform-arrow {
  color: #94a3b8;
}

.starter-bilingual-example {
  padding: 15px;
  background: #fff;
  border: 1px solid var(--lesson-line);
  border-radius: 15px;
}

.starter-bilingual-example .starter-example-en {
  color: #15352d;
  font-size: 15px;
}

.starter-bilingual-example .starter-example-en mark {
  color: #047857;
  background: #dcfce7;
  border-radius: 4px;
}

.starter-bilingual-example .starter-example-uz {
  color: #6b7f79;
  font-size: 13px;
}

.starter-group-box p {
  margin: 10px 0 0;
  color: var(--lesson-muted);
  font-size: 13px;
  line-height: 1.45;
}

.starter-pronunciation-inline,
.starter-exception-box,
.starter-mistakes {
  margin-top: 18px;
  padding: 18px;
  border-radius: 18px;
}

.starter-pronunciation-inline {
  color: #273d4d;
  background: #eff6ff;
  border: 1px solid #bfdbfe;
}

.starter-pronunciation-items {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin: 12px 0;
}

.starter-pronunciation-item {
  padding: 9px 11px;
  background: #fff;
  border-radius: 11px;
}

.starter-pronunciation-item strong {
  color: #1d4ed8;
}

.starter-exception-box {
  color: #674812;
  background: #fffbeb;
  border: 1px solid #fde68a;
}

.starter-mistakes {
  background: #fff7ed;
  border: 1px solid #fed7aa;
}

.starter-mistake {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) auto minmax(0, 1fr);
  gap: 10px;
  align-items: center;
  padding: 10px 0;
  border-top: 1px solid rgba(194, 65, 12, 0.1);
}

.starter-mistake:first-of-type {
  border-top: 0;
}

.starter-wrong {
  color: #b91c1c;
  text-decoration: line-through;
}

.starter-correct {
  color: #047857;
  font-weight: 900;
}

.starter-note-box,
.starter-memory-box,
.starter-precision-box {
  margin-top: 16px;
  color: #334b44;
}

.starter-memory-box {
  background: #f7fee7;
  border: 1px solid #d9f99d;
}

.starter-memory-box span {
  color: #4d7c0f;
}

.starter-precision-box {
  background: #f5f3ff;
  border: 1px solid #ddd6fe;
}

.starter-precision-box span {
  color: #6d28d9;
}

.starter-container-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 9px;
}

.starter-container-item {
  padding: 12px;
  background: #f7faf8;
  border: 1px solid var(--lesson-line);
  border-radius: 13px;
}

.starter-container-item strong {
  display: block;
  color: #075943;
  font-size: 13px;
}

.starter-container-item span {
  display: block;
  margin-top: 5px;
  color: var(--lesson-muted);
  font-size: 12px;
}

.starter-pronunciation-card,
.starter-summary-card,
.starter-quiz-card,
.starter-finish-card {
  padding: clamp(22px, 4vw, 36px);
}

.starter-sound-card {
  padding: 17px;
  background: #fff;
  border: 1px solid var(--lesson-line);
  border-radius: 16px;
}

.starter-sound-card strong {
  display: block;
  color: var(--lesson-green);
  font-size: 25px;
}

.starter-sound-card p {
  min-height: 40px;
  color: var(--lesson-muted);
  font-size: 13px;
  line-height: 1.45;
}

.starter-summary-item {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 14px;
  background: #f7faf8;
  border: 1px solid var(--lesson-line);
  border-radius: 14px;
}

.starter-summary-item span {
  color: var(--lesson-muted);
  font-size: 13px;
}

.starter-summary-item strong {
  color: #075943;
  font-size: 13px;
  text-align: right;
}

.starter-quiz-list {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.starter-quiz-question {
  padding: 18px;
  background: #f8fbf9;
  border: 1px solid var(--lesson-line);
  border-radius: 17px;
}

.starter-quiz-question h3 {
  margin: 0 0 12px;
  font-size: 16px;
  line-height: 1.4;
}

.starter-quiz-options {
  display: grid;
  gap: 8px;
}

.starter-quiz-option {
  width: 100%;
  padding: 11px 13px;
  color: #314a43;
  font: inherit;
  font-size: 13px;
  font-weight: 750;
  text-align: left;
  background: #fff;
  border: 1px solid #d9e3df;
  border-radius: 11px;
  cursor: pointer;
}

.starter-quiz-option:hover {
  border-color: #6ee7b7;
  background: #ecfdf5;
}

.starter-quiz-option.is-correct {
  color: #047857;
  background: #d1fae5;
  border-color: #6ee7b7;
}

.starter-quiz-option.is-wrong {
  color: #b91c1c;
  background: #fee2e2;
  border-color: #fca5a5;
}

.starter-quiz-feedback {
  margin: 10px 0 0;
  color: var(--lesson-muted);
  font-size: 13px;
  line-height: 1.45;
}

.starter-finish-card {
  text-align: center;
  background: linear-gradient(135deg, #ecfdf5, #f7fee7);
}

.starter-finish-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.starter-finish-button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 44px;
  padding: 11px 17px;
  color: #fff;
  font: inherit;
  font-size: 13px;
  font-weight: 900;
  text-decoration: none;
  background: linear-gradient(135deg, var(--lesson-green), #65a30d);
  border: 0;
  border-radius: 999px;
  box-shadow: 0 12px 24px rgba(8, 127, 91, 0.2);
  cursor: pointer;
}

.starter-finish-button.is-secondary {
  color: #075943;
  background: #fff;
  border: 1px solid rgba(8, 127, 91, 0.18);
  box-shadow: none;
}

@media (max-width: 1080px) {
  .starter-lesson-layout {
    grid-template-columns: 1fr;
  }

  .starter-toc {
    position: static;
    order: -1;
  }

  .starter-toc-list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .starter-toc-link {
    grid-template-columns: 28px minmax(0, 1fr);
  }
}

@media (max-width: 820px) {
  .starter-lesson-hero {
    grid-template-columns: 1fr;
  }

  .starter-objectives,
  .starter-transform-grid,
  .starter-container-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .starter-toc-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 620px) {
  .starter-lesson-main {
    padding: 10px 12px 50px;
  }

  .starter-lesson-topbar {
    top: 6px;
    min-height: 48px;
    padding-left: 58px;
  }

  .starter-scroll-progress {
    min-width: 0;
    flex: 1;
  }

  .starter-scroll-progress > span:first-child {
    display: none;
  }

  .starter-lesson-hero {
    padding: 28px 20px;
    border-radius: 23px;
  }

  .starter-objectives,
  .starter-comparison-grid,
  .starter-group-grid,
  .starter-example-grid,
  .starter-summary-grid,
  .starter-pronunciation-grid,
  .starter-rule-core,
  .starter-transform-grid,
  .starter-container-grid {
    grid-template-columns: 1fr;
  }

  .starter-toc-link {
    font-size: 11px;
  }

  .starter-toc {
    overflow: hidden;
    padding: 13px;
  }

  .starter-toc h2 {
    margin-bottom: 9px;
    font-size: 14px;
  }

  .starter-toc-list {
    display: flex;
    gap: 7px;
    width: 100%;
    min-width: 0;
    max-width: 100%;
    overflow-x: auto;
    padding-bottom: 3px;
    scrollbar-width: thin;
  }

  .starter-toc-link {
    flex: 0 0 148px;
  }

  .starter-rule-head {
    align-items: start;
  }

  .starter-rule-number {
    width: 43px;
    height: 43px;
  }

  .starter-mistake {
    grid-template-columns: 1fr;
    gap: 4px;
  }
}