.landing {
  display: flex;
  flex-direction: column;
  gap: 3.5rem;
  padding: 1rem 0 2rem;
}

.landing-hero {
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

.landing-hero h1 {
  font-size: clamp(2.6rem, 4vw, 3.6rem);
  line-height: 1.05;
  margin-bottom: 0.75rem;
}

.hero-subhead {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  margin: 0 auto 2rem;
  max-width: 32rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
}

.hero-meta {
  margin: 0 0 0.45rem;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.hero-progress {
  margin-top: 1.25rem;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  width: fit-content;
  margin-left: auto;
  margin-right: auto;
}

.cta-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 2.4rem;
  background: var(--color-surface-dark);
  color: var(--color-text-inverse);
  text-decoration: none;
  border-radius: 999px;
  font-size: 0.98rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  border: 1px solid var(--color-surface-dark);
  box-shadow: 0 12px 24px rgba(20, 20, 20, 0.18);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.cta-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 32px rgba(20, 20, 20, 0.24);
}

.cta-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 2.2rem;
  background: transparent;
  color: var(--color-text-primary);
  text-decoration: none;
  border-radius: 999px;
  border: 1px solid var(--color-border-muted);
  font-size: 0.95rem;
  font-weight: 600;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.cta-secondary:hover {
  background: var(--color-surface-muted);
  border-color: var(--color-border-strong);
  transform: translateY(-1px);
}

.landing-board {
  display: flex;
  justify-content: center;
  padding: 1.5rem clamp(0.5rem, 3vw, 1rem);
  background: linear-gradient(180deg, var(--color-surface-band-clear) 0%,
    var(--color-surface-band-mid) 50%, var(--color-surface-band-clear) 100%);
  border-radius: 32px;
  position: relative;
}

.landing-board::before {
  content: '';
  position: absolute;
  left: 18%;
  right: 18%;
  top: 0.3rem;
  height: 3px;
  background-image:
    linear-gradient(90deg, rgba(0, 0, 0, 0), var(--color-separator-strong), rgba(0, 0, 0, 0)),
    linear-gradient(90deg, rgba(0, 0, 0, 0), var(--color-separator-soft), rgba(0, 0, 0, 0));
  background-size: 100% 1px, 75% 1px;
  background-position: center top, center bottom;
  background-repeat: no-repeat;
  opacity: 0.9;
}

.landing-board-frame {
  padding: 0.5rem 0;
}

.landing-board-frame .tutorial-board {
  --board-scale: 0.78;
  --board-margin: -1.25rem;
  transform: scale(var(--board-scale));
  transform-origin: center;
  margin: var(--board-margin) auto;
}

.landing-lessons {
  background: var(--color-surface-card);
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-soft);
}

.lessons-header {
  text-align: center;
  margin-bottom: 2rem;
}

.lessons-header p {
  color: var(--color-text-muted);
  margin: 0.5rem auto 0;
  max-width: 34rem;
}

.lessons-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25rem;
}

.lesson-card {
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.2rem 1.35rem;
  background: var(--color-surface-card);
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  box-shadow: 0 12px 24px rgba(24, 24, 24, 0.08);
}

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

.lesson-index {
  text-transform: uppercase;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--color-text-muted);
}

.lesson-card h3 {
  margin: 0;
  font-size: 1.05rem;
}

.lesson-card p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.lesson-status {
  margin-top: auto;
  align-self: flex-start;
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-strong);
  background: var(--color-surface-muted);
}

.lesson-status.completed {
  color: var(--color-success-strong);
  background: var(--color-success-muted);
}

.stat-chip {
  padding: 0.5rem 1rem;
  border-radius: 999px;
  border: 1px solid var(--color-border-subtle);
  background: var(--color-surface-card);
  font-size: 0.9rem;
  color: var(--color-text-muted);
  box-shadow: 0 10px 18px rgba(24, 24, 24, 0.08);
}

.landing-stats {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.stat-chip strong {
  color: var(--color-text-primary);
  font-weight: 600;
}

.landing-progress {
  height: 8px;
  border-radius: 999px;
  background: var(--color-surface-track);
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.08);
  overflow: hidden;
  width: 100%;
  min-width: 220px;
  max-width: 360px;
}

.landing-progress-fill {
  display: block;
  height: 100%;
  width: var(--progress, 0%);
  background: var(--color-accent-primary);
  border-radius: inherit;
  transition: width 0.4s ease;
}

.landing-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  background: var(--color-surface-card);
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-lg);
  padding: 2rem 2.5rem;
  box-shadow: var(--shadow-soft);
}

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

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

.landing-cta h2 {
  margin: 0 0 0.4rem;
  font-size: clamp(1.6rem, 2.4vw, 2.1rem);
}

.landing-cta p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 1rem;
}

.cta-actions {
  display: flex;
  gap: 0.6rem;
  flex-wrap: nowrap;
  align-items: center;
  justify-content: flex-end;
  flex: 0 0 auto;
}

.landing-cta .cta-primary,
.landing-cta .cta-secondary {
  white-space: nowrap;
}

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

@media (max-width: 900px) {
  .landing {
    gap: 2.5rem;
  }

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

  .landing-board-frame {
    padding: 1.25rem;
  }

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

}

/* 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: 1.5rem;
    align-items: flex-start;
  }

  .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: 2rem;
    padding: 0.5rem 0 1.5rem;
  }

  .landing-hero {
    width: 100%;
    padding: 0 0.5rem;
    box-sizing: border-box;
    overflow: hidden;
  }

  .landing-hero h1 {
    font-size: clamp(2.1rem, 5vw, 2.8rem);
  }

  .hero-subhead {
    font-size: 1rem;
    margin-bottom: 1.25rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
    width: 100%;
    box-sizing: border-box;
  }

  .cta-primary,
  .cta-secondary {
    width: min(100%, 320px);
    padding: 0.75rem 1.6rem;
    box-sizing: border-box;
  }

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

  .landing-cta .cta-actions {
    gap: 0.6rem;
  }

  .landing-cta .cta-primary,
  .landing-cta .cta-secondary {
    width: min(100%, 280px);
    padding: 0.6rem 1.2rem;
    font-size: 0.9rem;
  }

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

@media (max-width: 640px) {
  .landing-board-frame .tutorial-board {
    --board-scale: 0.68;
    --board-margin: -1.8rem;
  }

  .landing-lessons {
    padding: 2rem 1.5rem;
  }
}

@media (max-width: 480px) {
  .landing {
    gap: 2rem;
    padding: 0.5rem 0 1.5rem;
  }

  .landing-hero h1 {
    font-size: clamp(2.1rem, 8vw, 2.6rem);
  }

  .hero-subhead {
    font-size: 1rem;
    margin-bottom: 1.5rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .cta-primary,
  .cta-secondary {
    width: 100%;
    padding: 0.75rem 1.5rem;
  }

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

  .landing-board {
    padding: 1rem 0.5rem;
    border-radius: 24px;
  }

  .landing-board-frame {
    padding: 1rem 0.5rem;
  }

  .landing-board-frame .tutorial-board {
    --board-scale: 0.48;
    --board-margin: -2.8rem;
  }

  .landing-lessons {
    padding: 1.6rem 1.1rem;
  }

  .lessons-header {
    margin-bottom: 1.5rem;
  }

  .lesson-card {
    padding: 1rem;
  }

  .landing-cta {
    padding: 1.5rem;
    gap: 1.5rem;
  }

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

@media (max-width: 390px) {
  .landing-board-frame .tutorial-board {
    --board-scale: 0.44;
    --board-margin: -3rem;
  }
}

@media (max-width: 360px) {
  .landing-hero h1 {
    font-size: clamp(1.95rem, 10vw, 2.3rem);
  }

  .hero-subhead {
    font-size: 0.95rem;
  }

  .landing-board-frame .tutorial-board {
    --board-scale: 0.42;
    --board-margin: -3.1rem;
  }

  .stat-chip {
    font-size: 0.82rem;
    padding: 0.45rem 0.8rem;
  }
}