.landing {
  display: flex;
  flex-direction: column;
  gap: var(--space-7);
  padding: var(--space-4) 0 var(--space-6);
}

.landing-stage {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  align-items: stretch;
}

.landing-hero-shell.tutorial-top-callout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(250px, auto);
  grid-template-areas:
    "copy progress"
    ". actions";
  align-items: start;
  row-gap: var(--space-5);
  column-gap: var(--space-8);
  padding: var(--space-6);
  justify-content: initial;
  container-type: inline-size;
  container-name: landing-hero;
}

.landing-hero-copy {
  grid-area: copy;
}

.landing-hero h1 {
  font-size: clamp(calc(var(--text-xl) * 2), 4vw, calc(var(--text-xl) * 3));
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-055);
  font-weight: 700;
  color: var(--color-text-strong);
}

.hero-subhead {
  font-size: var(--text-105);
  color: var(--color-text-muted);
  line-height: 1.5;
  margin: 0 0 var(--space-6);
  max-width: 44ch;
  position: relative;
  padding-left: calc(var(--space-5) + var(--space-4));
  font-weight: 450;
}

.hero-subhead::before {
  content: "";
  position: absolute;
  left: var(--space-4);
  top: 0.15em;
  bottom: 0.15em;
  width: 2px;
  background: linear-gradient(
    180deg,
    color-mix(in srgb, var(--color-accent-primary), transparent 8%) 0%,
    color-mix(in srgb, var(--color-accent-primary), transparent 15%) 70%,
    transparent 100%
  );
  border-radius: 1px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start;
  gap: var(--space-2);
}

.landing-hero-shell > .hero-actions {
  grid-area: actions;
  flex-direction: row;
  justify-content: flex-end;
  flex-wrap: nowrap;
  gap: var(--space-3);
}

.hero-meta {
  margin: 0;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: -0.01em;
}

.hero-progress {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  align-self: flex-start;
  gap: var(--space-1);
  min-width: 220px;
  grid-area: progress;
  justify-self: end;
  background: var(--color-surface-panel);
  border: 1px solid var(--color-border-subtle);
  text-align: right;
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  box-shadow:
    0 2px 4px color-mix(in srgb, var(--color-surface-dark), transparent 94%),
    0 8px 24px color-mix(in srgb, var(--color-surface-dark), transparent 92%);
}

@container landing-hero (max-width: 44rem) {
  .landing-hero-shell.tutorial-top-callout {
    grid-template-columns: 1fr;
    grid-template-areas:
      "copy"
      "progress"
      "actions";
    row-gap: var(--space-3);
  }

  .hero-progress {
    justify-self: stretch;
    min-width: 0;
    text-align: left;
  }

  .landing-progress {
    min-width: 0;
    max-width: 100%;
  }

  .landing-hero-shell > .hero-actions {
    justify-content: stretch;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-2);
  }

  .landing-hero-shell > .hero-actions .ds-button {
    width: 100%;
    padding: var(--space-3) var(--space-085);
    text-align: center;
  }
}

@container landing-hero (max-width: 30rem) {
  .landing-hero-shell > .hero-actions {
    grid-template-columns: 1fr;
  }

  .landing-hero-shell > .hero-actions .ds-button {
    padding: var(--space-3) var(--space-12);
  }
}

.landing-board {
  display: flex;
  justify-content: center;
  padding: var(--space-12) clamp(var(--space-2), 3vw, var(--space-4))
    var(--space-145);
  border-radius: 32px;
  position: relative;
}

.landing-board-frame .board-wrapper {
  --board-scale: 0.78;
  --board-margin: calc(var(--space-16) * -1) auto
    calc((var(--space-8) + var(--space-8) + var(--space-4)) * -1);
  transform-origin: top center;
}

.landing-lessons {
  background: linear-gradient(
    180deg,
    var(--color-callout-start),
    var(--color-callout-end)
  );
}

.lessons-header {
  text-align: center;
  margin-bottom: var(--space-6);
}

.lessons-header p {
  color: var(--color-text-muted);
  margin: var(--space-2) auto 0;
  max-width: var(--width-md);
}

.lessons-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}

.lesson-card {
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-11);
  background: color-mix(in srgb, var(--color-text-inverse), transparent 10%);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  box-shadow: var(--shadow-soft);
}

.lesson-card.completed {
  border-color: var(--color-border-success);
  background: var(--color-success-soft);
}

.lesson-card.next-up {
  border-color: var(--color-highlight-border);
  background: linear-gradient(
    180deg,
    var(--color-callout-start),
    var(--color-highlight-surface)
  );
  box-shadow:
    var(--shadow-soft),
    0 0 0 2px var(--color-highlight-shadow);
}

.lesson-card-top {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.lesson-badge {
  display: inline-flex;
}

.lesson-card.completed .lesson-badge {
  background: var(--color-success);
}

.lesson-index {
  text-transform: uppercase;
  font-size: var(--text-072);
  letter-spacing: 0.14em;
  color: var(--color-text-muted);
}

.lesson-card h3 {
  margin: 0;
  font-size: var(--text-105);
}

.lesson-card p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: var(--text-09);
}

.lesson-card .ds-badge {
  margin-top: auto;
  align-self: flex-start;
}

.landing-progress {
  height: 6px;
  border-radius: var(--radius-pill);
  background: var(--color-surface-track);
  box-shadow: inset 0 1px 2px
    color-mix(in srgb, var(--color-surface-dark), transparent 92%);
  overflow: hidden;
  width: 100%;
  min-width: 220px;
  max-width: 360px;
}

.landing-progress-fill {
  display: block;
  height: 100%;
  width: var(--progress, 0%);
  background: linear-gradient(
    90deg,
    var(--color-accent-secondary),
    var(--color-accent-primary)
  );
  border-radius: inherit;
  transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.landing-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.landing-cta > div {
  min-width: 0;
}

.landing-cta > div:first-child {
  flex: 1;
  max-width: 520px;
}

.landing-cta h2 {
  margin: 0 0 var(--space-045);
  font-size: clamp(var(--text-16), 2.4vw, var(--text-20));
}

.landing-cta p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: var(--text-md);
}

.cta-actions {
  display: flex;
  gap: var(--space-065);
  flex-wrap: nowrap;
  align-items: center;
  justify-content: flex-end;
  flex: 0 0 auto;
}

.landing-hero .ds-button,
.landing-cta .ds-button {
  white-space: nowrap;
}

.landing-resource {
  text-align: center;
  margin-top: var(--space-3);
}

.landing-resource-links {
  display: grid;
  gap: var(--space-1);
  justify-items: center;
}

.page-back-link {
  margin: var(--space-3) 0 0;
}

.page-breadcrumb {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.page-back-link--end {
  text-align: center;
}

.history-page {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.history-hero {
  text-align: center;
  max-width: 860px;
  margin: 0 auto;
}

.history-kicker {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: var(--text-xs);
  color: var(--color-text-subtle);
  margin-bottom: var(--space-2);
}

.history-subhead {
  max-width: 62ch;
  margin: 0 auto var(--space-5);
  color: var(--color-text-muted);
  font-size: var(--text-11);
}

.history-section h2 {
  margin-top: 0;
}

.history-section p,
.history-section li {
  color: var(--color-text-primary);
}

.history-section p {
  margin: 0;
}

.history-section p + p {
  margin-top: var(--space-2);
}

.history-section ul,
.history-timeline {
  margin: var(--space-3) 0 0;
  padding-left: var(--space-12);
  display: grid;
  gap: var(--space-1);
}

.history-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.history-cta h2 {
  margin: 0 0 var(--space-045);
}

.history-cta p {
  margin: 0;
  color: var(--color-text-muted);
}

.first-grade-math {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.first-grade-hero {
  text-align: center;
  max-width: 780px;
  margin: 0 auto;
}

.first-grade-hero .hero-actions {
  justify-content: center;
}

.first-grade-kicker {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: var(--text-xs);
  color: var(--color-text-subtle);
  margin-bottom: var(--space-2);
}

.first-grade-subhead {
  max-width: var(--width-lg);
  margin: 0 auto var(--space-5);
  color: var(--color-text-muted);
  font-size: var(--text-11);
}

.print-trigger {
  cursor: pointer;
}

.first-grade-benefits {
  padding: var(--space-175) var(--space-6);
  text-align: center;
}

.first-grade-benefits h2 {
  margin-top: 0;
}

.first-grade-benefits ul {
  margin: 0 auto;
  padding-left: var(--space-12);
  list-style-position: outside;
  display: inline-grid;
  gap: var(--space-2);
  text-align: left;
}

.print-guide {
  padding: var(--space-6);
}

.print-guide-header h2 {
  margin: 0;
}

.print-guide-header p {
  margin: var(--space-045) 0 0;
  color: var(--color-text-muted);
}

.print-guide-board {
  margin-top: var(--space-4);
}

.print-guide-board .landing-board-frame .board-wrapper {
  --board-scale: 0.72;
  --board-margin: calc(var(--space-16) * -1) auto;
}

.print-guide-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-125);
}

.print-guide-grid article {
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  background: var(--color-surface-panel);
}

.print-guide-grid h3 {
  margin: 0 0 var(--space-2);
  font-size: var(--text-105);
}

.print-guide-grid ol,
.print-guide-grid ul {
  margin: 0;
  padding-left: var(--space-12);
  display: grid;
  gap: var(--space-035);
}

.print-tip {
  margin: var(--space-4) 0 0;
  padding: var(--space-3) var(--space-095);
  border-radius: var(--radius-sm);
  background: var(--color-warning-soft);
  color: var(--color-text-primary);
}

.print-reference {
  display: none;
}

/* ==========================================================================
   Responsive Breakpoints (ordered largest → smallest)
   ========================================================================== */

@media (max-width: 900px) {
  .landing {
    gap: var(--space-7);
  }

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

  .landing-board-frame {
    padding: var(--space-125);
  }

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

  .print-guide-grid {
    grid-template-columns: 1fr;
  }

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

  .print-guide-board .landing-board-frame .board-wrapper {
    --board-scale: 0.62;
    --board-margin: -2rem auto;
  }
}

/* Shared small-screen overflow prevention */
@media (max-width: 720px) {
  .landing {
    width: 100%;
    max-width: 100%;
    min-width: 0;
    overflow-x: hidden;
    overflow-x: clip;
  }

  .landing-cta {
    gap: var(--space-5);
  }

  .cta-actions {
    flex-wrap: wrap;
    justify-content: flex-start;
  }

  .landing-board,
  .landing-board-frame {
    width: 100%;
    max-width: 100%;
    min-width: 0;
  }

  .landing-board-frame {
    display: flex;
    justify-content: center;
  }
}

@media (max-width: 720px) and (orientation: landscape) {
  .landing {
    gap: var(--space-6);
    padding: var(--space-2) 0 var(--space-5);
  }

  .landing-hero {
    width: 100%;
    padding: 0 var(--space-2);
    overflow: hidden;
  }

  .landing-hero h1 {
    font-size: clamp(var(--text-20), 5vw, var(--text-2-5));
  }

  .hero-subhead {
    font-size: var(--text-md);
    margin-bottom: var(--space-125);
  }

  .cta-actions {
    flex-direction: column;
    width: 100%;
    align-items: center;
  }

  .landing-cta .ds-button {
    width: min(100%, 280px);
    padding: var(--space-065) var(--space-12);
    font-size: var(--text-09);
  }

  .landing-cta {
    align-items: center;
    text-align: center;
  }
}

@media (max-width: 640px) {
  .landing-hero-shell.tutorial-top-callout {
    grid-template-columns: 1fr;
    grid-template-areas:
      "copy"
      "progress"
      "actions";
    row-gap: var(--space-3);
  }

  .landing-hero h1 {
    font-size: clamp(var(--text-20), 8vw, var(--text-2-5));
  }

  .hero-subhead {
    max-width: none;
    padding-left: calc(var(--space-5) + var(--space-2));
    hyphens: auto;
    word-break: break-word;
  }

  .hero-subhead::before {
    top: 0.2em;
    bottom: 0.2em;
    left: var(--space-2);
  }

  .hero-progress {
    justify-self: stretch;
    min-width: 0;
    text-align: left;
  }

  .landing-progress {
    min-width: 0;
    max-width: 100%;
  }

  .landing-hero-shell > .hero-actions {
    justify-content: stretch;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-2);
  }

  .landing-hero-shell > .hero-actions .ds-button {
    width: 100%;
    padding: var(--space-3) var(--space-085);
    text-align: center;
  }

  .landing-board-frame .board-wrapper {
    --board-scale: 0.68;
    --board-margin: 0 auto;
  }

  .landing-lessons {
    padding: var(--space-6) var(--space-5);
  }
}

@media (max-width: 480px) {
  .landing-stage {
    gap: 0;
  }

  .landing {
    gap: var(--space-125);
    padding: var(--space-2) 0 var(--space-5);
  }

  .landing-hero h1 {
    font-size: clamp(var(--text-20), 8vw, calc(var(--text-xl) * 2));
  }

  .hero-subhead {
    font-size: var(--text-md);
    margin-bottom: var(--space-5);
  }

  .landing-hero-shell > .hero-actions {
    grid-template-columns: 1fr;
  }

  .landing-hero-shell > .hero-actions .ds-button {
    padding: var(--space-3) var(--space-12);
  }

  .landing-board {
    margin-bottom: calc(var(--space-9-8) * -1);
    padding: var(--space-1) var(--space-2);
    border-radius: 24px;
  }

  .landing-board-frame {
    padding: var(--space-1) var(--space-035);
  }

  .landing-board-frame .board-wrapper {
    --board-scale: 0.48;
  }

  .print-guide-board .landing-board-frame .board-wrapper {
    --board-scale: 0.48;
    --board-margin: 0 auto;
  }

  .landing-lessons {
    padding: var(--space-6) var(--space-4);
  }

  .lessons-header {
    margin-bottom: var(--space-5);
  }

  .lesson-card {
    padding: var(--space-4);
  }

  .landing-cta {
    padding: var(--space-5);
  }

  .cta-actions {
    flex-direction: column;
    width: 100%;
    align-items: stretch;
  }

  .cta-actions .ds-button {
    width: 100%;
    text-align: center;
  }

  .first-grade-benefits,
  .print-guide,
  .history-section,
  .history-cta {
    padding: var(--space-14);
  }
}

@media print {
  @page {
    margin: 0.75cm 0.6cm 0.6cm;
  }

  body {
    background: white;
    color: black;
  }

  .page-shell {
    max-width: none;
    padding: 0;
  }

  .first-grade-hero,
  .first-grade-benefits,
  .page-breadcrumb,
  .page-back-link,
  .hero-actions,
  .kofi-overlay,
  iframe[src*="ko-fi.com"],
  iframe[src*="storage.ko-fi.com"],
  [id*="kofi"],
  [class*="kofi"],
  script,
  .print-trigger {
    display: none;
  }

  .print-guide {
    border: none;
    box-shadow: none;
    padding: 0;
    width: 100%;
    margin: 0;
  }

  .print-guide-board {
    background: none;
    border: none;
    border-radius: 0;
    box-shadow: none;
    padding: 0;
    margin-top: var(--space-1);
  }

  .print-guide-board .landing-board {
    padding: 0;
    margin: 0;
  }

  .print-guide-board .landing-board-frame {
    padding: 0;
  }

  .print-guide-board .landing-board-frame .board-wrapper {
    --board-scale: 0.68;
    --board-margin: var(--space-005) auto calc(var(--space-045) * -1);
  }

  .print-guide-board .tutorial-board {
    background: white;
    border: 2px solid black;
    border-radius: 12px;
    box-shadow: none;
    padding: var(--space-3) var(--space-065);
    gap: var(--space-045);
  }

  .print-guide-board .pit,
  .print-guide-board .store {
    background: white;
    border: 2px solid black;
    box-shadow: none;
  }

  .print-guide-board .pit {
    width: 72px;
    height: 72px;
  }

  .print-guide-board .store {
    width: 72px;
    height: 154px;
  }

  .print-guide-board .pit-label {
    color: black;
  }

  .print-guide-board .stone {
    box-shadow: none;
    border: 2px solid black;
  }

  .print-guide-board .store-count,
  .print-guide-board .stone-overflow {
    box-shadow: none;
    border: 2px solid black;
  }

  .print-guide-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-065);
    margin-top: calc(var(--space-035) * -1);
    display: grid;
  }

  .print-guide-grid article {
    border: 1px solid lightgray;
    break-inside: avoid;
    padding: var(--space-055) var(--space-065);
  }

  .print-guide-header p,
  .print-tip {
    margin-top: 0;
    font-size: var(--text-092);
  }

  .print-tip {
    background: white;
    border: 1px solid lightgray;
    padding: var(--space-035) var(--space-055);
  }

  .print-reference {
    display: block;
    margin: 0;
    text-align: right;
    font-size: var(--text-xs);
    font-weight: 600;
    color: black;
  }
}

@media (max-width: 390px) {
  .landing-board-frame .board-wrapper {
    --board-scale: 0.44;
  }

  .print-guide-board .landing-board-frame .board-wrapper {
    --board-scale: 0.44;
    --board-margin: 0 auto;
  }
}

@media (max-width: 360px) {
  .landing-hero h1 {
    font-size: clamp(var(--text-20), 10vw, calc(var(--text-20) * 1.15));
  }

  .hero-subhead {
    font-size: var(--text-sm);
  }

  .landing-board-frame .board-wrapper {
    --board-scale: 0.42;
  }

  .print-guide-board .landing-board-frame .board-wrapper {
    --board-scale: 0.42;
    --board-margin: 0 auto;
  }
}