:root {
  color-scheme: dark;
  --board: #202a34;
  --board-raised: #293640;
  --chalk: #fff3e0;
  --chalk-muted: #ddd6c9;
  --chalk-yellow: #ffda63;
  --chalk-mint: #acf0ce;
  --chalk-lilac: #e3acee;
  --chalk-pink: #fa9a9e;
  --chalk-ink: #26303a;
  --chalk-border: #52606d;
  --chalk-font: Nunito, ui-rounded, "Arial Rounded MT Bold", system-ui, sans-serif;
}

.chalk-landing, .chalk-studio {
  background: var(--board);
  background-image: radial-gradient(ellipse at 75% 4%, #36424c 0%, transparent 45%),
    radial-gradient(circle at center, #ffffff09 0.65px, transparent 0.85px);
  background-size: auto, 5px 5px;
  color: var(--chalk);
  font-family: var(--chalk-font);
  margin: 0;
}

.chalk-landing *, .chalk-landing *::before, .chalk-landing *::after { box-sizing: border-box; }
.chalk-landing a, .chalk-studio .chalk-brand { color: inherit; }
.chalk-landing :focus-visible, .chalk-studio :focus-visible {
  outline: 3px solid var(--chalk-mint);
  outline-offset: 4px;
}

.chalk-header, .chalk-main, .chalk-footer {
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: clamp(1.1rem, 4vw, 3rem);
}

.chalk-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 1.25rem;
}

.chalk-brand {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 0.3em;
  font-size: clamp(1.2rem, 3.4vw, 2.15rem);
  font-weight: 1000;
  letter-spacing: -0.055em;
  line-height: 1.1;
  text-decoration: none;
  white-space: nowrap;
}

.chalk-brand-mark {
  display: block;
  flex: none;
  width: 1.25em;
  height: 1.25em;
}
.chalk-header nav, .chalk-actions { display: flex; align-items: center; gap: clamp(0.8rem, 3vw, 2rem); }
.chalk-nav-link { font-weight: 800; text-decoration: none; }
.chalk-nav-link:hover { text-decoration: underline; }
.chalk-landing .chalk-button, .chalk-studio .chalk-button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 2.75rem;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0.6rem 1.1rem;
  background: var(--chalk-yellow);
  color: var(--chalk-ink);
  font: 900 0.98rem/1.2 var(--chalk-font);
  text-decoration: none;
  cursor: pointer;
}
.chalk-landing .chalk-button:hover, .chalk-studio .chalk-button:hover { background: #ffe690; }
.chalk-landing .chalk-button-large { font-size: clamp(1.05rem, 2.1vw, 1.35rem); padding: 0.9rem 1.35rem; }

.chalk-hero {
  display: grid;
  grid-template-columns: 1.13fr 1fr;
  align-items: center;
  gap: clamp(1.5rem, 3vw, 3rem);
  padding-block: clamp(1.6rem, 5vw, 4rem) clamp(1.5rem, 4vw, 3rem);
}
.chalk-hero h1 {
  font-size: clamp(2.65rem, 5.5vw, 4.05rem);
  line-height: 1.03;
  letter-spacing: -0.045em;
  font-weight: 1000;
  margin: 0;
}
.chalk-hero h1 span {
  text-decoration: underline;
  text-decoration-color: var(--chalk-lilac);
  text-decoration-thickness: 0.07em;
  text-underline-offset: 0.13em;
}
.chalk-hero-copy > p {
  max-width: 29em;
  font-size: clamp(1.05rem, 2.2vw, 1.45rem);
  font-weight: 700;
  line-height: 1.42;
  margin: 1.45rem 0 1.6rem;
}
.chalk-actions { flex-wrap: wrap; gap: 0.85rem 1.2rem; }
.chalk-hero-copy > .chalk-free-note {
  width: fit-content;
  margin: 1rem 0 0.3rem;
  padding: 0.45rem 0.85rem;
  color: var(--chalk-ink);
  background: var(--chalk-mint) radial-gradient(circle at center, #26303a19 0.55px, transparent 0.8px) 0 0 / 5px 5px;
  border: 1px dashed #506e64;
  border-radius: 0.35rem 0.58rem 0.42rem 0.5rem;
  box-shadow: 0.2rem 0.23rem var(--chalk-lilac);
  font-size: clamp(0.95rem, 1.6vw, 1.15rem);
  font-weight: 1000;
  line-height: 1.2;
  transform: rotate(-4deg);
}
.chalk-example-link {
  font-weight: 850;
  text-decoration-color: var(--chalk-lilac);
  text-decoration-thickness: 3px;
  text-underline-offset: 0.45rem;
}
.chalk-illustration {
  position: relative;
  isolation: isolate;
  margin: 0;
  min-height: 340px;
  aspect-ratio: 1.13;
  scroll-margin-top: 1rem;
}
.chalk-pencil {
  width: 100%;
  height: auto;
  position: absolute;
  inset: auto 0 0;
  z-index: -1;
  pointer-events: none;
}
.chalk-note {
  position: absolute;
  top: 6%;
  left: 3%;
  width: 72%;
  transform: rotate(1.5deg);
  font-size: clamp(0.95rem, 2.1vw, 1.3rem);
}
.chalk-note, .chalk-learning-example {
  padding: clamp(0.85rem, 2vw, 1.35rem);
  color: var(--chalk-ink);
  background: #fff1d9;
  background-image: radial-gradient(circle at center, #66442d16 0.6px, transparent 0.8px);
  background-size: 5px 5px;
  border: 1px solid #ead7b9;
  border-radius: 1rem 1.3rem 0.85rem 1.1rem;
  box-shadow: 0 0.6rem 1.5rem #11192344;
}
.chalk-illustration:target .chalk-note { outline: 3px solid var(--chalk-yellow); outline-offset: 5px; }
.chalk-note-title { display: flex; align-items: center; gap: 0.6rem; font-weight: 1000; margin-bottom: 0.65rem; }
.chalk-paper-icon {
  display: inline-block;
  width: 0.95em;
  height: 1.2em;
  border: 2px solid currentColor;
  border-radius: 0.2em;
  position: relative;
  flex: 0 0 auto;
}
.chalk-paper-icon::after {
  content: "";
  position: absolute;
  left: 0.14em;
  right: 0.14em;
  bottom: 0.2em;
  height: 0.33em;
  border-block: 1px solid currentColor;
}
.chalk-note-words { display: grid; border: 1px solid #ac9baa; border-radius: 0.42rem; overflow: hidden; }
.chalk-note-words > * { padding: 0.25em 0.48em; font-weight: 850; }
.chalk-note-words > strong { background: #e8bbea; font-weight: 1000; }
.chalk-note-words span + span { border-top: 1px solid #b9a9b7; }
.chalk-note-language {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-top: 0.75rem;
  padding: 0.35em 0.48em;
  border: 1px solid #a290a4;
  border-radius: 0.45rem;
  font-size: 0.86em;
  font-weight: 900;
}

.chalk-steps {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin: 0;
  padding: 1rem 0;
  border-block: 2px dashed #d9a8e4;
  scroll-margin-top: 1rem;
}
.chalk-steps li {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.65rem;
  font-size: clamp(0.93rem, 2.45vw, 1.52rem);
  font-weight: 900;
  text-align: center;
}
.chalk-steps li:not(:last-child)::after {
  content: "→";
  position: absolute;
  right: -0.48em;
  color: var(--chalk-yellow);
  font-weight: 1000;
}
.chalk-step-icon { display: inline-block; position: relative; flex: 0 0 auto; width: 1.15em; height: 1.15em; }
.chalk-step-icon.paste { border: 2px solid; border-radius: 0.19em; }
.chalk-step-icon.paste::before { content: ""; position: absolute; inset: -0.18em 0.19em auto; height: 0.3em; border: 2px solid; border-radius: 0.15em; background: var(--board); }
.chalk-step-icon.review { width: 0.89em; height: 0.89em; border: 2px solid; border-radius: 50%; }
.chalk-step-icon.review::after { content: ""; position: absolute; bottom: -0.19em; right: -0.23em; width: 0.41em; border-bottom: 2px solid; transform: rotate(47deg); }
.chalk-step-icon.practise { width: 0; height: 0; border: 0.51em solid transparent; border-left: 0.8em solid currentColor; border-right: 0; }

.chalk-activities { padding-block: clamp(2.3rem, 5vw, 4.2rem) 3rem; }
.chalk-activities h2 {
  position: relative;
  width: fit-content;
  margin: 0 auto clamp(1.7rem, 3vw, 2.7rem);
  font-size: clamp(1.85rem, 4.8vw, 3.55rem);
  line-height: 1.09;
  letter-spacing: -0.04em;
  font-weight: 1000;
  text-align: center;
}
.chalk-activities h2::after {
  content: "";
  display: block;
  width: 70%;
  height: 0.26em;
  margin: 0.18em auto 0;
  border-top: 4px solid var(--chalk-pink);
  border-radius: 50%;
}
.chalk-activity-grid, .chalk-why-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(0.85rem, 2vw, 1.6rem);
}
.chalk-activity {
  --accent: var(--chalk-mint);
  background: #293b3f;
  border: 2px dashed color-mix(in srgb, var(--accent), transparent 25%);
  border-radius: 1rem 0.8rem 0.95rem 0.75rem;
  padding: 0.75rem clamp(1rem, 2vw, 1.7rem) 1.2rem;
  min-width: 0;
}
.chalk-translation { --accent: #ffe696; background: #363c3e; }
.chalk-speaking { --accent: var(--chalk-lilac); background: #343748; }
.chalk-activity-icon {
  width: 5rem;
  height: 5rem;
  margin-inline: auto;
  background: url("/assets/chalk-icons.png") 0% center / 300% 100% no-repeat;
}
.chalk-book-icon { background-position-x: 50%; }
.chalk-speech-icon { background-position-x: 100%; }
.chalk-activity h3 {
  color: var(--accent);
  text-align: center;
  font-size: clamp(1.2rem, 2.7vw, 1.85rem);
  line-height: 1.12;
  font-weight: 1000;
  min-height: 2.25em;
  display: grid;
  place-items: center;
  margin: 0 0 0.6rem;
}
.chalk-activity ul { list-style: none; margin: 0; padding: 0; }
.chalk-activity li {
  border-top: 1px solid color-mix(in srgb, var(--accent), transparent 58%);
  padding: 0.62rem 0;
  font-size: clamp(1.02rem, 1.85vw, 1.29rem);
  font-weight: 850;
}
.chalk-activity p { color: var(--chalk-muted); font-size: 0.92rem; line-height: 1.4; margin: 0.7rem 0 0; }

.chalk-why, .chalk-learning, .chalk-faq { scroll-margin-top: 1rem; }
.chalk-why {
  padding: clamp(1.2rem, 4vw, 2.5rem);
  background: var(--board-raised);
  border: 1px solid var(--chalk-border);
  border-radius: 1.2rem 0.85rem 1.15rem 0.9rem;
}
.chalk-why h2, .chalk-learning h2, .chalk-faq h2 {
  margin: 0 0 1.35rem;
  font-size: clamp(1.8rem, 4.5vw, 2.8rem);
  line-height: 1.1;
  font-weight: 1000;
  letter-spacing: -0.04em;
}
.chalk-why-list { list-style: none; margin: 0 0 1.6rem; padding: 0; }
.chalk-why-list li { --accent: var(--chalk-mint); }
.chalk-why-list li:nth-child(2) { --accent: var(--chalk-yellow); }
.chalk-why-list li:nth-child(3) { --accent: var(--chalk-lilac); }
.chalk-why-list h3 {
  margin: 0 0 0.4rem;
  color: var(--accent);
  font-size: 1.25rem;
  line-height: 1.2;
  font-weight: 1000;
}
.chalk-why-list h3::before {
  content: "";
  display: block;
  width: 2.2rem;
  height: 0.3rem;
  margin-bottom: 0.45rem;
  border-top: 3px solid currentColor;
  border-radius: 50%;
}
.chalk-why-list p { margin: 0; color: var(--chalk-muted); line-height: 1.5; }

.chalk-learning {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: center;
  gap: clamp(1.25rem, 5vw, 3.5rem);
  padding-block: clamp(2.3rem, 6vw, 4.25rem);
}
.chalk-learning-benefits {
  display: grid;
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.chalk-learning-benefits li {
  border-inline-start: 2px solid var(--chalk-lilac);
  padding-inline-start: 0.85rem;
}
.chalk-learning-benefits h3 {
  margin: 0 0 0.3rem;
  font-size: 1.15rem;
  line-height: 1.2;
  font-weight: 1000;
}
.chalk-learning-benefits p {
  margin: 0;
  color: var(--chalk-muted);
  font-size: clamp(1rem, 2vw, 1.15rem);
  line-height: 1.55;
}
.chalk-learning-example { margin: 0; }
.chalk-learning-example figcaption { font-size: 1.2rem; font-weight: 1000; }
.chalk-learning-example dl { margin: 0.65rem 0 0; }
.chalk-learning-example dl > div {
  display: grid;
  grid-template-columns: minmax(7.5rem, 0.7fr) minmax(0, 1fr);
  align-items: baseline;
  gap: 0.3rem 0.85rem;
  padding-block: 0.75rem;
  border-block-start: 1px solid #cbb4a0;
}
.chalk-learning-example dl > div:last-child { padding-block-end: 0.15rem; }
.chalk-learning-example dt { font-size: 0.9rem; font-weight: 850; }
.chalk-learning-example dd { display: grid; gap: 0.1rem; margin: 0; }
.chalk-learning-example dd strong { font-weight: 1000; }

.chalk-faq { max-width: 48rem; margin-inline: auto; padding-block-end: clamp(2rem, 6vw, 4rem); }
.chalk-faq h2 { text-align: center; }
.chalk-faq details { border-block-end: 1px solid var(--chalk-border); }
.chalk-faq details:first-of-type { border-block-start: 1px solid var(--chalk-border); }
.chalk-faq summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 0.85rem 0.25rem;
  list-style: none;
  font-size: 1.1rem;
  font-weight: 900;
  cursor: pointer;
}
.chalk-faq summary::-webkit-details-marker { display: none; }
.chalk-faq summary:hover, .chalk-faq details[open] summary { color: var(--chalk-mint); }
.chalk-faq summary::after {
  content: "";
  flex: 0 0 0.52rem;
  height: 0.52rem;
  margin-inline-end: 0.2rem;
  border: solid var(--chalk-mint);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}
.chalk-faq details[open] summary::after { transform: rotate(225deg); }
.chalk-faq details p { margin: 0 0.25rem 1rem; color: var(--chalk-muted); line-height: 1.55; }

.chalk-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem 1.6rem;
  padding-block: 1.3rem 1.6rem;
  border-block-start: 1px solid var(--chalk-border);
}
.chalk-footer .chalk-brand { font-size: 1.35rem; }
.chalk-footer nav { display: flex; flex-wrap: wrap; align-items: center; gap: 0.75rem 1.2rem; }
.chalk-footer nav a:not(.chalk-button) { font-weight: 800; text-underline-offset: 0.22em; }

.chalk-legal-footer {
  flex: 1 0 100%;
  display: grid;
  grid-template-columns: 1fr minmax(0, 27rem);
  align-items: start;
  gap: 0.75rem 1.6rem;
  color: var(--chalk-muted);
  font: 700 0.95rem/1.5 var(--chalk-font);
  text-align: start;
}
.chalk-legal-footer nav { min-height: 2.75rem; }
.chalk-legal-footer a { color: var(--chalk); }
.chalk-landing .chalk-legal-footer .chalk-privacy-widget a,
.chalk-privacy-widget summary { color: var(--chalk-mint); }
.chalk-landing .chalk-footer > .chalk-legal-footer { padding-top: 0.85rem; border-top: 1px solid var(--chalk-border); }
.chalk-privacy-widget {
  margin: 0;
  padding-inline: 0.85rem;
  border: 1px dashed var(--chalk-border);
  border-radius: 0.8rem 0.65rem 0.9rem 0.7rem;
  background: var(--board-raised);
  color: var(--chalk);
  font: inherit;
}
.chalk-privacy-widget summary {
  padding-block: 0.58rem;
  font-weight: 900;
  cursor: pointer;
}
.chalk-privacy-widget p { margin: 0 0 0.55rem; color: var(--chalk); }
.chalk-privacy-widget a { display: inline-block; margin-bottom: 0.75rem; text-underline-offset: 0.2em; }

.chalk-policy { max-width: 53rem; padding-block: clamp(1.2rem, 4vw, 3rem); line-height: 1.65; }
.chalk-policy h1 { margin: 0 0 1.25rem; font-size: clamp(2.25rem, 6vw, 3.4rem); line-height: 1.12; font-weight: 1000; }
.chalk-policy h2 { margin: 0 0 0.5rem; color: var(--chalk-lilac); font-size: clamp(1.22rem, 3vw, 1.55rem); line-height: 1.25; font-weight: 950; }
.chalk-policy section { margin-block-start: 1.55rem; scroll-margin-top: 1rem; }
.chalk-policy p, .chalk-policy ul { margin: 0.6rem 0; }
.chalk-policy ul { padding-inline-start: 1.3rem; }
.chalk-policy li + li { margin-top: 0.55rem; }
.chalk-policy a { text-decoration-color: var(--chalk-mint); text-underline-offset: 0.2em; overflow-wrap: anywhere; }

@media (max-width: 740px) {
  .chalk-hero { grid-template-columns: 1fr; padding-block: 1.35rem 1.4rem; gap: 1.5rem; }
  .chalk-hero-copy > p { margin-block: 1.1rem 1.2rem; }
  .chalk-illustration { min-height: 0; width: min(100%, 430px); justify-self: center; }
  .chalk-note { left: 4%; width: 69%; font-size: clamp(0.9rem, 4vw, 1.12rem); }
  .chalk-activity-grid, .chalk-why-list, .chalk-learning { grid-template-columns: 1fr; }
  .chalk-why-list { gap: 1.1rem; }
  .chalk-activity h3 { min-height: 0; }
  .chalk-activity-icon { width: 4rem; height: 4rem; }
  .chalk-activity { padding-inline: 1.25rem; }
  .chalk-legal-footer { grid-template-columns: 1fr; gap: 0.4rem; }
}
@media (max-width: 460px) {
  .chalk-header { padding-block: 0.85rem; }
  .chalk-header .chalk-button { font-size: 0.82rem; padding-inline: 0.75rem; }
  .chalk-nav-link { display: none; }
  .chalk-steps li { gap: 0.28rem; flex-direction: column; }
  .chalk-steps li:not(:last-child)::after { top: 0.52rem; }
  .chalk-learning-example dl > div { grid-template-columns: 1fr; }
}