:root {
  color-scheme: light;
  --bg: #f9fdfb;
  --paper: #ffffff;
  --paper-soft: #e9f8f2;
  --ink: #102326;
  --muted: #59706f;
  --line: #bfe5dc;
  --accent: #00a878;
  --accent-2: #3366ff;
  --accent-soft: #e8fbf4;
  --good: #11845f;
  --warn: #d97706;
  --radius: 8px;
  --shadow: 0 16px 34px rgba(16, 35, 38, 0.1);
}

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

body {
  margin: 0;
  background:
    linear-gradient(180deg, rgba(232, 251, 244, 0.48), rgba(249, 253, 251, 0) 320px),
    var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1rem;
  line-height: 1.55;
}

a {
  color: var(--accent);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--accent-2);
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid rgba(19, 163, 130, 0.28);
  outline-offset: 3px;
}

.wrap {
  width: min(1080px, calc(100% - 32px));
  margin: 0 auto;
}

.topbar {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 0 8px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent-2);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero {
  padding: 34px 0 30px;
  border-bottom: 1px solid var(--line);
}

h1 {
  max-width: 820px;
  margin: 0;
  font-size: clamp(1.75rem, 3.8vw, 2.8rem);
  line-height: 1.09;
  letter-spacing: 0;
}

.title-translation {
  max-width: 780px;
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 600;
}

h2 {
  margin: 26px 0 8px;
  font-size: clamp(1.15rem, 1.8vw, 1.45rem);
  line-height: 1.18;
  letter-spacing: 0;
}

h3 {
  margin: 0;
  font-size: 1.14rem;
  line-height: 1.2;
}

.dek {
  max-width: 780px;
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 1rem;
}

.who {
  max-width: 860px;
  margin-top: 24px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 253, 250, 0.72);
}

.program {
  display: grid;
  gap: 18px;
  padding-bottom: 56px;
}

.block {
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.block-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
}

.bn,
.cnt,
.meta {
  color: var(--muted);
  font-size: 0.92rem;
}

.lessons {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 10px;
}

.lesson {
  min-height: 112px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: center;
  padding: 15px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--ink);
  text-decoration: none;
  box-shadow: 0 1px 0 rgba(24, 32, 31, 0.04);
  transition: border-color 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}

.lesson:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow);
  color: var(--ink);
  transform: translateY(-1px);
}

.lesson-muted {
  opacity: 0.72;
  cursor: default;
}

.lesson-muted:hover {
  border-color: var(--line);
  box-shadow: none;
  transform: none;
}

.lesson small {
  display: block;
  margin-top: 6px;
  color: var(--muted);
}

.go-mark {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 1.25rem;
  font-weight: 800;
  transition: background 160ms ease, color 160ms ease, transform 160ms ease;
}

.lesson:hover .go-mark {
  background: var(--accent);
  color: #fff;
  transform: translateX(2px);
}

.badge {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  min-height: 24px;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--good);
  font-size: 0.78rem;
  font-weight: 700;
}

.update-button {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 40px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--paper);
  color: var(--ink);
  font: inherit;
  cursor: pointer;
}

.update-button[data-has-updates="true"]::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--warn);
  animation: pulse 1.6s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 0.55;
    transform: scale(0.85);
  }

  50% {
    opacity: 1;
    transform: scale(1.2);
  }
}

.updates-panel {
  display: none;
  position: absolute;
  right: 16px;
  top: 70px;
  z-index: 20;
  width: min(420px, calc(100vw - 32px));
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  box-shadow: var(--shadow);
}

.updates-panel[data-open="true"] {
  display: block;
}

.updates-panel ul {
  margin: 10px 0 0;
  padding-left: 20px;
}

.updates-panel li + li {
  margin-top: 12px;
}

.lesson-shell {
  max-width: 820px;
  padding: 24px 0 54px;
}

.lesson-nav {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 0;
}

.callout,
.quiz,
.glossary-box,
.principle-card,
.memory-item {
  margin: 16px 0;
  padding: 16px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
}

.lesson-card {
  margin: 22px 0;
  padding: 0 6px;
}

.phrase-card,
.source-card {
  margin: 22px 0;
  padding: 0 6px;
}

.lesson-card h2,
.principle-card h2,
.glossary-box h2,
.quiz h2,
.source-card h2 {
  margin-top: 0;
  font-size: clamp(1.15rem, 1.7vw, 1.38rem);
}

.lesson-card p,
.principle-card p,
.glossary-box p,
.quiz p,
.callout p {
  margin: 0;
}

.lesson-card p + p,
.principle-card p + p,
.glossary-box p + p,
.quiz p + p,
.callout p + p {
  margin-top: 12px;
}

.lesson-card p + p {
  margin-top: 14px;
}

.lesson-card dl,
.glossary-box dl {
  margin: 0;
}

.lesson-card dd,
.glossary-box dd {
  margin-left: 0;
  padding-left: 24px;
}

.callout {
  border-left: 4px solid var(--accent);
}

.glossary-box,
.quiz {
  box-shadow: 0 1px 0 rgba(16, 35, 38, 0.04);
}

.principle-card {
  background: linear-gradient(135deg, var(--accent-soft), #eef5ff);
  border-color: rgba(19, 163, 130, 0.35);
}

.memory-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 18px 0 8px;
}

.memory-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  align-items: start;
  margin: 0;
  background: rgba(255, 255, 255, 0.86);
}

.memory-item p {
  margin: 0;
}

.pictogram {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 999px;
  background: #00b37a;
  color: #fff;
  box-shadow: 0 0 0 3px rgba(0, 179, 122, 0.14);
  font-weight: 800;
}

.inline-picto {
  display: inline-grid;
  place-items: center;
  width: 1.45em;
  height: 1.45em;
  margin-right: 0.35em;
  border-radius: 999px;
  background: var(--accent-soft);
  color: #008f69;
  font-size: 0.78em;
  font-weight: 800;
  vertical-align: 0.08em;
}

.phrase-card dt + dd {
  margin-bottom: 14px;
}

.quiz button {
  display: block;
  width: 100%;
  margin-top: 8px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  color: var(--ink);
  text-align: left;
  font: inherit;
  cursor: pointer;
}

.quiz button:hover:not(:disabled) {
  border-color: var(--accent);
}

.quiz button:disabled {
  cursor: default;
}

.quiz button[data-result="correct"] {
  border-color: var(--good);
  background: #e7f8f0;
}

.quiz button[data-result="wrong"] {
  border-color: var(--warn);
  background: #fff5e8;
}

@media (max-width: 680px) {
  .wrap {
    width: min(100% - 24px, 1080px);
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero {
    padding: 30px 0 28px;
  }

  .block-head {
    display: block;
  }

  .cnt {
    display: block;
    margin-top: 4px;
  }

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

  .memory-strip {
    grid-template-columns: 1fr;
  }

  .lesson {
    min-height: auto;
  }

  .updates-panel {
    right: 12px;
    top: 104px;
  }

  .lesson-nav {
    flex-direction: column;
  }
}