:root {
  --green: #58cc02;
  --green-dark: #46a302;
  --blue: #1cb0f6;
  --purple: #ce82ff;
  --yellow: #ffc800;
  --red: #ff4b4b;
  --ink: #3c3c3c;
  --muted: #6f6f6f;
  --line: #e5e5e5;
  --soft: #f7f7f7;
  --paper: #ffffff;
  --answer: #f1ffe8;
  --answer-line: #46a302;
  --prompt: #f3fbff;
  --prompt-line: #d7eefc;
  --coach: #fbf4ff;
  --coach-line: #e7d4f7;
  --tip: #fff8d7;
  --tip-line: #ffe280;
  --shadow: 0 20px 60px rgba(60, 60, 60, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Nunito, ui-rounded, "Avenir Next", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: 0;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
textarea {
  font: inherit;
}

.shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 2px solid var(--line);
  backdrop-filter: blur(12px);
}

.nav {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  font-size: 20px;
  font-weight: 900;
}

.mark {
  width: 42px;
  height: 42px;
  border-radius: 8px;
  background: var(--green);
  border: 2px solid var(--green-dark);
  border-bottom-width: 5px;
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 13px;
  font-weight: 900;
  flex: 0 0 auto;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.button {
  min-height: 44px;
  border: 2px solid var(--green-dark);
  border-bottom-width: 5px;
  border-radius: 8px;
  background: var(--green);
  color: #fff;
  padding: 0 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 900;
  text-transform: uppercase;
  cursor: pointer;
}

.button.secondary {
  background: var(--paper);
  color: var(--blue);
  border-color: #d7eefc;
}

.button:focus-visible,
.lesson-tab:focus-visible,
.answer-toggle:focus-visible {
  outline: 3px solid rgba(28, 176, 246, 0.35);
  outline-offset: 3px;
}

.hero {
  padding: 36px 0 28px;
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(420px, 1fr);
  gap: 24px;
  align-items: center;
}

.hero-copy {
  display: grid;
  align-content: center;
  min-width: 0;
}

h1 {
  margin: 0;
  max-width: 100%;
  font-size: clamp(38px, 5.2vw, 58px);
  line-height: 1.04;
  font-weight: 900;
  overflow-wrap: break-word;
  text-wrap: balance;
}

.lead {
  margin: 18px 0 0;
  max-width: 100%;
  color: #626262;
  font-size: 19px;
  line-height: 1.55;
  font-weight: 750;
}

.hero-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(120px, 1fr));
  gap: 12px;
  margin-top: 26px;
}

.stat {
  min-height: 104px;
  border: 2px solid var(--line);
  border-bottom-width: 5px;
  border-radius: 8px;
  background: var(--paper);
  padding: 16px;
}

.stat strong {
  display: block;
  font-size: 28px;
  line-height: 1;
  font-weight: 900;
}

.stat span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.4;
  font-weight: 800;
}

.lesson-preview {
  min-width: 0;
  width: 100%;
  border: 2px solid #d7d7d7;
  border-bottom-width: 7px;
  border-radius: 8px;
  background: var(--paper);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.preview-top {
  min-height: 70px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  border-bottom: 2px solid var(--line);
  background: #fbfffa;
}

.preview-title {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  font-weight: 900;
}

.flag {
  width: 48px;
  height: 34px;
  border: 2px solid #d8d8d8;
  border-radius: 6px;
  overflow: hidden;
  display: grid;
  grid-template-rows: repeat(3, 1fr);
  flex: 0 0 auto;
}

.flag span:nth-child(1) {
  background: #ae1c28;
}

.flag span:nth-child(2) {
  background: #fff;
}

.flag span:nth-child(3) {
  background: #21468b;
}

.pill {
  border: 2px solid var(--tip-line);
  border-bottom-width: 4px;
  border-radius: 8px;
  background: var(--tip);
  color: #9a7000;
  padding: 7px 10px;
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
  white-space: nowrap;
}

.preview-body {
  display: grid;
  grid-template-columns: 190px minmax(0, 1fr);
  min-height: 430px;
}

.path {
  border-right: 2px solid var(--line);
  background: var(--soft);
  padding: 18px;
  display: grid;
  gap: 12px;
  align-content: start;
}

.path-step {
  border: 2px solid var(--line);
  border-bottom-width: 5px;
  border-radius: 8px;
  background: var(--paper);
  padding: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  font-weight: 900;
}

.path-step.active {
  border-color: var(--green-dark);
  background: var(--answer);
}

.dot {
  width: 26px;
  height: 26px;
  border-radius: 8px;
  background: var(--green);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 12px;
  font-weight: 900;
  flex: 0 0 auto;
}

.sample {
  padding: 22px;
  display: grid;
  gap: 16px;
  align-content: start;
}

.prompt-card,
.coach-card,
.answer-card,
.tip-card {
  border: 2px solid var(--line);
  border-bottom-width: 5px;
  border-radius: 8px;
  padding: 18px;
}

.prompt-card {
  border-color: var(--prompt-line);
  background: var(--prompt);
}

.coach-card {
  border-color: var(--coach-line);
  background: var(--coach);
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 14px;
}

.answer-card {
  border-color: var(--answer-line);
  background: var(--answer);
}

.tip-card {
  border-color: var(--tip-line);
  background: var(--tip);
}

.avatar {
  width: 52px;
  height: 52px;
  border-radius: 8px;
  background: var(--purple);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 900;
}

.label {
  display: block;
  margin-bottom: 7px;
  color: var(--blue);
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 11px;
  font-weight: 900;
  text-transform: uppercase;
}

.prompt-card strong,
.coach-card strong,
.answer-card strong,
.tip-card strong {
  display: block;
  font-size: 17px;
  line-height: 1.3;
  font-weight: 900;
}

.prompt-card p,
.coach-card p,
.answer-card p,
.tip-card p {
  margin: 8px 0 0;
  color: #555;
  line-height: 1.5;
  font-weight: 750;
}

.section {
  padding: 34px 0 70px;
  border-top: 2px solid var(--line);
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 20px;
}

.section h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1.06;
  font-weight: 900;
}

.section-head p {
  margin: 0;
  max-width: 480px;
  color: var(--muted);
  line-height: 1.5;
  font-weight: 750;
}

.lesson-layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.lesson-tabs {
  position: sticky;
  top: 94px;
  display: grid;
  gap: 10px;
}

.lesson-tab {
  border: 2px solid var(--line);
  border-bottom-width: 5px;
  border-radius: 8px;
  background: var(--paper);
  padding: 13px 14px;
  text-align: left;
  color: var(--ink);
  cursor: pointer;
}

.lesson-tab[aria-selected="true"] {
  border-color: var(--green-dark);
  background: var(--answer);
}

.lesson-tab span {
  display: block;
  color: var(--muted);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.lesson-tab strong {
  display: block;
  margin-top: 3px;
  font-size: 15px;
  line-height: 1.25;
  font-weight: 900;
}

.lesson-panel {
  min-width: 0;
  border: 2px solid #d7d7d7;
  border-bottom-width: 7px;
  border-radius: 8px;
  background: var(--paper);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.lesson-panel-head {
  padding: 22px;
  border-bottom: 2px solid var(--line);
  background: #fbfffa;
}

.lesson-panel-head h3 {
  margin: 0;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.05;
  font-weight: 900;
}

.lesson-panel-head p {
  margin: 10px 0 0;
  color: var(--muted);
  line-height: 1.5;
  font-weight: 750;
}

.lesson-meta {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.meta-chip {
  border: 2px solid var(--line);
  border-bottom-width: 4px;
  border-radius: 8px;
  background: var(--paper);
  padding: 7px 10px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.lesson-content {
  padding: 22px;
  display: grid;
  gap: 16px;
}

.exercise-card {
  border: 2px solid var(--line);
  border-bottom-width: 5px;
  border-radius: 8px;
  background: var(--paper);
  padding: 18px;
}

.exercise-card h4 {
  margin: 0;
  font-size: 20px;
  line-height: 1.2;
  font-weight: 900;
}

.exercise-card p {
  margin: 10px 0 0;
  color: #4f4f4f;
  line-height: 1.55;
  font-weight: 700;
  overflow-wrap: anywhere;
}

.speaking-image {
  margin: 14px 0 0;
  border: 2px solid var(--line);
  border-bottom-width: 5px;
  border-radius: 8px;
  background: var(--soft);
  overflow: hidden;
}

.speaking-image img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.speaking-image figcaption {
  padding: 8px 12px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.audio-box {
  margin-top: 14px;
  border: 2px solid var(--prompt-line);
  border-bottom-width: 5px;
  border-radius: 8px;
  background: var(--prompt);
  padding: 12px;
}

.audio-box strong {
  display: block;
  margin-bottom: 8px;
  color: var(--blue);
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 11px;
  font-weight: 900;
  text-transform: uppercase;
}

.audio-box audio {
  width: 100%;
  display: block;
}

.writing-checklist {
  border: 2px solid var(--tip-line);
  border-bottom-width: 5px;
  border-radius: 8px;
  background: var(--tip);
  padding: 16px 18px;
}

.writing-checklist strong {
  display: block;
  font-size: 17px;
  line-height: 1.3;
  font-weight: 900;
}

.writing-checklist ul {
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.writing-checklist label {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  line-height: 1.4;
  font-weight: 800;
  color: #665000;
}

.writing-checklist input {
  width: 18px;
  height: 18px;
  margin-top: 1px;
  accent-color: var(--green);
  flex: 0 0 auto;
}

.writing-box {
  margin-top: 14px;
  display: grid;
  gap: 8px;
}

.writing-box span {
  color: var(--blue);
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 11px;
  font-weight: 900;
  text-transform: uppercase;
}

.writing-box textarea {
  width: 100%;
  min-height: 150px;
  border: 2px solid var(--prompt-line);
  border-bottom-width: 5px;
  border-radius: 8px;
  background: var(--prompt);
  color: var(--ink);
  padding: 14px;
  line-height: 1.5;
  font-weight: 750;
  resize: vertical;
}

.writing-box textarea:focus {
  outline: 3px solid rgba(28, 176, 246, 0.25);
  outline-offset: 2px;
}

.exercise-card ul,
.exercise-card ol {
  margin: 12px 0 0;
  padding-left: 22px;
}

.exercise-card li {
  margin: 6px 0;
  line-height: 1.45;
  font-weight: 750;
}

.answer-toggle {
  width: 100%;
  margin-top: 14px;
  border: 2px solid var(--answer-line);
  border-bottom-width: 5px;
  border-radius: 8px;
  background: var(--answer);
  padding: 12px 14px;
  text-align: left;
  color: #347a00;
  cursor: pointer;
}

.answer-toggle strong {
  display: block;
  font-size: 14px;
  text-transform: uppercase;
}

.answer-toggle span {
  display: block;
  margin-top: 7px;
  color: #35542b;
  line-height: 1.5;
  font-weight: 800;
  overflow-wrap: anywhere;
}

.answers-hidden .answer-toggle span {
  display: none;
}

.answers-hidden .answer-toggle.is-open span {
  display: block;
}

.footer {
  padding: 32px 0 48px;
  border-top: 2px solid var(--line);
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
  font-weight: 750;
}

@media (max-width: 1100px) {
  .hero,
  .preview-body,
  .lesson-layout {
    grid-template-columns: 1fr;
  }

  .path {
    border-right: 0;
    border-bottom: 2px solid var(--line);
  }

  .lesson-tabs {
    position: static;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .shell {
    width: calc(100% - 24px);
    max-width: 100%;
  }

  .nav {
    min-height: 76px;
  }

  .brand span:last-child {
    display: none;
  }

  .nav-actions {
    min-width: 0;
    margin-left: auto;
  }

  .button {
    max-width: 132px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  #printLesson {
    display: none;
  }

  h1 {
    font-size: 34px;
    line-height: 1.08;
    overflow-wrap: anywhere;
  }

  .lead {
    font-size: 16px;
  }

  .hero {
    gap: 22px;
  }

  .stat {
    min-height: 88px;
  }

  .hero-grid {
    grid-template-columns: 1fr;
  }

  .preview-top {
    align-items: flex-start;
    flex-wrap: wrap;
  }

  .preview-title {
    width: 100%;
  }

  .sample,
  .lesson-content,
  .exercise-card,
  .prompt-card,
  .coach-card,
  .answer-card,
  .tip-card {
    min-width: 0;
  }

  .sample,
  .lesson-content {
    padding: 16px;
  }

  .prompt-card,
  .coach-card,
  .answer-card,
  .tip-card,
  .exercise-card {
    padding: 14px;
  }

  .prompt-card strong,
  .coach-card strong,
  .answer-card strong,
  .tip-card strong {
    font-size: 16px;
    overflow-wrap: anywhere;
  }

  .lesson-panel-head {
    padding: 18px 16px;
  }

  .section-head {
    display: grid;
  }

  .lesson-tabs {
    grid-template-columns: 1fr;
  }

  .nav-actions {
    gap: 6px;
  }

  .button {
    padding: 0 11px;
    font-size: 12px;
  }
}

@media (max-width: 860px) {
  #answerMode {
    width: 46px;
    min-width: 46px;
    max-width: 46px;
    flex: 0 0 46px;
    padding: 0;
    position: relative;
    overflow: visible;
    font-size: 0;
    color: var(--green-dark);
  }

  #answerMode::before,
  #answerMode::after {
    content: "";
    position: absolute;
    left: 50%;
    top: 50%;
    width: 22px;
    height: 4px;
    border: 0;
    border-radius: 999px;
    background: currentColor;
    transform-origin: center;
  }

  body.answers-hidden #answerMode::before {
    transform: translate(-50%, -50%) rotate(45deg);
  }

  body.answers-hidden #answerMode::after {
    transform: translate(-50%, -50%) rotate(-45deg);
  }

  body:not(.answers-hidden) #answerMode::before {
    left: 20px;
    top: 25px;
    width: 10px;
    transform: translate(-50%, -50%) rotate(45deg);
  }

  body:not(.answers-hidden) #answerMode::after {
    left: 28px;
    top: 21px;
    width: 20px;
    transform: translate(-50%, -50%) rotate(-45deg);
  }
}

.nav-link {
  min-height: 44px;
  border: 2px solid #d7eefc;
  border-bottom-width: 5px;
  border-radius: 8px;
  background: var(--paper);
  color: var(--blue);
  padding: 0 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 900;
  text-transform: uppercase;
  white-space: nowrap;
}

.nav-link:focus-visible,
.footer-link:focus-visible {
  outline: 3px solid rgba(28, 176, 246, 0.35);
  outline-offset: 3px;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.footer-link {
  color: var(--blue);
  font-weight: 900;
  text-transform: uppercase;
  white-space: nowrap;
}

@media (max-width: 640px) {
  .nav-link {
    min-height: 44px;
    padding: 0 10px;
    font-size: 12px;
  }

  .footer-inner {
    align-items: flex-start;
    display: grid;
  }
}