.mastery-shell {
  --mastery-accent: var(--ms-ember, #e85d2a);
  --mastery-gold: var(--ms-gold, #d99a00);
  --mastery-line: color-mix(in srgb, var(--md-default-fg-color) 18%, transparent);
  --mastery-muted: color-mix(in srgb, var(--md-default-fg-color) 68%, transparent);
  --mastery-panel: color-mix(in srgb, var(--md-default-bg-color) 94%, var(--mastery-accent));
  margin-block: 1.6rem 2.8rem;
}

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

.mastery-progress {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(16rem, 0.85fr);
  gap: clamp(1.2rem, 4vw, 3rem);
  align-items: center;
  margin-bottom: 1rem;
  padding: clamp(1.25rem, 4vw, 2.25rem);
  overflow: hidden;
  color: #fff8ef;
  background:
    radial-gradient(circle at 90% 10%, rgba(255, 183, 3, 0.2), transparent 32%),
    linear-gradient(135deg, #211714, #5b2719 62%, #8a341d);
  border: 1px solid rgba(255, 183, 3, 0.22);
  border-radius: 1.25rem;
  box-shadow: 0 18px 55px rgba(72, 29, 13, 0.18);
}

.mastery-progress[hidden] {
  display: none;
}

.mastery-progress__copy h2 {
  margin: 0.15rem 0 0.45rem;
  color: #fff;
  font-size: clamp(1.35rem, 3vw, 2rem);
}

.mastery-progress__copy > p:last-child,
.mastery-progress__status {
  margin: 0;
  color: rgba(255, 248, 239, 0.74);
  font-size: 0.78rem;
  line-height: 1.6;
}

.mastery-progress__eyebrow,
.mastery-card__eyebrow {
  margin: 0;
  font-weight: 750;
  font-size: 0.64rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.mastery-progress__eyebrow {
  color: #ffc86a;
}

.mastery-progress__meter {
  min-width: 0;
}

.mastery-progress__label {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.55rem;
  font-weight: 700;
}

.mastery-progress progress {
  display: block;
  width: 100%;
  height: 0.68rem;
  overflow: hidden;
  appearance: none;
  background: rgba(255, 255, 255, 0.14);
  border: 0;
  border-radius: 999px;
}

.mastery-progress progress::-webkit-progress-bar {
  background: rgba(255, 255, 255, 0.14);
  border-radius: 999px;
}

.mastery-progress progress::-webkit-progress-value {
  background: linear-gradient(90deg, #ffb703, #ff6b35);
  border-radius: 999px;
  transition: width 220ms ease;
}

.mastery-progress progress::-moz-progress-bar {
  background: linear-gradient(90deg, #ffb703, #ff6b35);
  border-radius: 999px;
}

.mastery-progress__reset {
  min-height: 2.75rem;
  padding: 0.48rem 0.85rem;
  color: #fff8ef;
  font: inherit;
  font-size: 0.7rem;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 999px;
  cursor: pointer;
}

.mastery-progress__reset:disabled {
  cursor: default;
  opacity: 0.46;
}

.mastery-progress__next {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  margin-top: 0.7rem;
  color: #ffd37e !important;
  font-weight: 700;
}

.mastery-progress__next::after {
  margin-left: 0.4rem;
  content: "→";
}

.mastery-progress__status {
  min-height: 1.25rem;
  margin-top: 0.2rem;
}

.mastery-jump {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 0.45rem;
  margin: 1rem 0 1.6rem;
}

.mastery-jump a {
  display: flex;
  gap: 0.42rem;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: 0.45rem 0.55rem;
  color: var(--md-default-fg-color) !important;
  font-weight: 700;
  font-size: 0.72rem;
  background: var(--mastery-panel);
  border: 1px solid var(--mastery-line);
  border-radius: 0.72rem;
  transition: border-color 160ms ease, transform 160ms ease, background-color 160ms ease;
}

.mastery-jump a span {
  color: var(--mastery-accent);
  font-variant-numeric: tabular-nums;
}

.mastery-jump a:hover,
.mastery-jump a:focus-visible {
  background: color-mix(in srgb, var(--mastery-panel) 82%, var(--mastery-accent));
  border-color: color-mix(in srgb, var(--mastery-accent) 55%, transparent);
  transform: translateY(-2px);
}

.mastery-route {
  position: relative;
  display: grid;
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.mastery-route::before {
  position: absolute;
  top: 2.4rem;
  bottom: 2.4rem;
  left: 2rem;
  width: 2px;
  background: linear-gradient(var(--mastery-accent), var(--mastery-gold));
  content: "";
  opacity: 0.4;
}

.mastery-stop {
  position: relative;
  display: grid;
  grid-template-columns: 4rem minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
}

.mastery-stop__marker {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 4rem;
  height: 4rem;
  color: #fff;
  font-weight: 850;
  font-size: 0.82rem;
  font-variant-numeric: tabular-nums;
  background: linear-gradient(145deg, #39302c, #15110f);
  border: 4px solid var(--md-default-bg-color);
  border-radius: 50%;
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--mastery-accent) 42%, transparent);
  transition: background 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

.mastery-stop[data-current="true"] .mastery-stop__marker {
  background: linear-gradient(145deg, #ff9447, #b83a18);
  box-shadow: 0 0 0 5px color-mix(in srgb, var(--mastery-accent) 16%, transparent), 0 0 22px color-mix(in srgb, var(--mastery-accent) 28%, transparent);
}

.mastery-stop[data-mastered="true"] .mastery-stop__marker {
  background: linear-gradient(145deg, #72a964, #376c43);
  box-shadow: 0 0 0 2px color-mix(in srgb, #72a964 50%, transparent);
}

.mastery-stop[data-mastered="true"] .mastery-stop__marker::after {
  position: absolute;
  right: -0.15rem;
  bottom: -0.1rem;
  display: grid;
  place-items: center;
  width: 1.25rem;
  height: 1.25rem;
  color: #132015;
  font-weight: 900;
  font-size: 0.72rem;
  background: #b8e4a9;
  border: 2px solid var(--md-default-bg-color);
  border-radius: 50%;
  content: "✓";
}

.mastery-card {
  min-width: 0;
  padding: clamp(1.1rem, 3vw, 1.65rem);
  background:
    linear-gradient(115deg, color-mix(in srgb, var(--mastery-panel) 96%, transparent), var(--md-default-bg-color));
  border: 1px solid var(--mastery-line);
  border-radius: 1rem;
  box-shadow: 0 10px 32px rgba(30, 20, 15, 0.06);
  transition: border-color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

.mastery-stop[data-current="true"] .mastery-card {
  border-color: color-mix(in srgb, var(--mastery-accent) 56%, transparent);
  box-shadow: 0 16px 42px color-mix(in srgb, var(--mastery-accent) 12%, transparent);
}

.mastery-stop[data-mastered="true"] .mastery-card {
  border-color: color-mix(in srgb, #72a964 48%, transparent);
}

.mastery-card__header {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 0.65rem;
}

.mastery-card__header h2 {
  margin: 0.15rem 0 0;
  font-size: clamp(1.15rem, 2.5vw, 1.52rem);
  line-height: 1.25;
}

.mastery-card__eyebrow {
  color: var(--mastery-accent);
}

.mastery-card__lesson {
  margin: 0.55rem 0 1rem;
  color: var(--mastery-muted);
  line-height: 1.75;
}

.mastery-card a {
  font-weight: 680;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

.mastery-card__toggle {
  flex: 0 0 auto;
  min-height: 2.75rem;
  padding: 0.5rem 0.82rem;
  color: var(--md-default-fg-color);
  font: inherit;
  font-weight: 720;
  font-size: 0.72rem;
  background: transparent;
  border: 1px solid var(--mastery-line);
  border-radius: 999px;
  cursor: pointer;
}

.mastery-card__toggle[aria-pressed="true"] {
  color: color-mix(in srgb, #72a964 76%, var(--md-default-fg-color));
  background: color-mix(in srgb, #72a964 14%, transparent);
  border-color: color-mix(in srgb, #72a964 52%, transparent);
}

.mastery-card__goal {
  position: relative;
  padding: 0.9rem 1rem 0.9rem 1.15rem;
  background: color-mix(in srgb, var(--mastery-gold) 8%, transparent);
  border-left: 3px solid var(--mastery-gold);
  border-radius: 0 0.7rem 0.7rem 0;
}

.mastery-card__goal strong {
  color: color-mix(in srgb, var(--mastery-gold) 70%, var(--md-default-fg-color));
  font-size: 0.72rem;
  letter-spacing: 0.06em;
}

.mastery-card__goal p {
  margin: 0.3rem 0 0;
  line-height: 1.65;
}

.mastery-noscript {
  margin-top: 1rem;
  padding: 0.85rem 1rem;
  color: var(--mastery-muted);
  background: var(--mastery-panel);
  border: 1px solid var(--mastery-line);
  border-radius: 0.75rem;
}

.mastery-progress__reset:focus-visible,
.mastery-progress__next:focus-visible,
.mastery-jump a:focus-visible,
.mastery-card__toggle:focus-visible,
.mastery-card a:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--md-accent-fg-color) 68%, transparent);
  outline-offset: 3px;
}

.mastery-progress__reset:hover:not(:disabled),
.mastery-card__toggle:hover {
  border-color: color-mix(in srgb, var(--mastery-accent) 58%, transparent);
}

[data-md-color-scheme="slate"] .mastery-card {
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.16);
}

[data-md-color-scheme="slate"] .mastery-stop__marker {
  background: linear-gradient(145deg, #51453f, #1b1614);
}

@media (max-width: 760px) {
  .mastery-progress {
    grid-template-columns: 1fr;
  }

  .mastery-jump {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .mastery-route::before {
    left: 1.4rem;
  }

  .mastery-stop {
    grid-template-columns: 2.8rem minmax(0, 1fr);
    gap: 0.72rem;
  }

  .mastery-stop__marker {
    width: 2.8rem;
    height: 2.8rem;
    border-width: 3px;
  }
}

@media (max-width: 520px) {
  .mastery-progress {
    padding: 1.1rem;
    border-radius: 0.95rem;
  }

  .mastery-progress__label,
  .mastery-card__header {
    align-items: stretch;
    flex-direction: column;
  }

  .mastery-progress__reset,
  .mastery-card__toggle {
    align-self: flex-start;
  }

  .mastery-jump {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .mastery-card {
    padding: 1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .mastery-shell *,
  .mastery-shell *::before,
  .mastery-shell *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

@media print {
  .mastery-progress,
  .mastery-jump,
  .mastery-card__toggle {
    display: none !important;
  }

  .mastery-route::before {
    background: #777;
  }

  .mastery-card {
    break-inside: avoid;
    box-shadow: none;
  }
}