.tutorials-index {
  width: min(1180px, calc(100vw - 2rem));
  margin: 0 auto 2rem;
  padding: 2.1rem 2.3rem;
  box-sizing: border-box;
  background: var(--surface-strong);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 4px 24px rgba(15, 23, 42, 0.04);
}

.tutorials-index-header {
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}

.tutorials-kicker {
  margin: 0 0 0.4rem;
  color: #c05b4d;
  font-size: 0.86rem;
  font-weight: 650;
}

.tutorials-kicker a {
  color: inherit;
}

.tutorials-index-title {
  margin: 0;
  color: var(--text);
  font-size: 2.05rem;
  font-weight: 650;
  line-height: 1.25;
}

.tutorials-index-description {
  max-width: 42rem;
  margin: 0.75rem 0 0;
  color: var(--text-muted);
  line-height: 1.75;
}

.tutorials-series-grid,
.tutorials-lesson-list {
  display: grid;
  gap: 0.9rem;
  margin-top: 1.35rem;
}

.tutorials-series-card,
.tutorials-lesson-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: stretch;
  padding: 1.05rem 1.15rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: linear-gradient(180deg, #ffffff 0%, var(--surface) 100%);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.03);
}

.tutorials-series-card:hover,
.tutorials-lesson-card:hover {
  border-color: var(--accent-soft);
  background: #fcfdff;
  box-shadow: 0 8px 22px rgba(15, 23, 42, 0.06);
}

.tutorials-series-main,
.tutorials-lesson-main {
  display: grid;
  gap: 0.38rem;
  min-width: 0;
}

.tutorials-series-label {
  color: #c05b4d;
  font-size: 0.76rem;
  font-weight: 700;
  line-height: 1.2;
}

.tutorials-series-title,
.tutorials-lesson-title {
  color: var(--text);
  font-size: 1.08rem;
  font-weight: 600;
  line-height: 1.45;
}

.tutorials-series-description,
.tutorials-lesson-description {
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.65;
}

.tutorials-series-meta {
  display: grid;
  align-content: space-between;
  justify-items: end;
  min-width: 4.8rem;
  color: var(--text-muted);
}

.tutorials-series-count,
.tutorials-lesson-number {
  color: #98a2b3;
  font-family: "SFMono-Regular", SFMono-Regular, ui-monospace, Menlo, Consolas,
    "Liberation Mono", monospace;
  font-size: 0.84rem;
}

.tutorials-series-arrow {
  display: inline-flex;
  align-items: center;
  height: 1.65rem;
  padding: 0 0.6rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface-strong);
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 600;
}

.tutorials-series-card:hover .tutorials-series-title,
.tutorials-lesson-card:hover .tutorials-lesson-title,
.tutorials-series-card:hover .tutorials-series-arrow {
  color: var(--accent);
}

.tutorials-series-card:hover .tutorials-series-arrow {
  border-color: var(--accent-soft);
  background: #eff6ff;
}

.tutorials-empty {
  margin-top: 1.25rem;
  color: var(--text-muted);
}

.tutorial-page-wrapper {
  width: min(1460px, calc(100vw - 2rem));
  margin: 0 auto;
  display: grid;
  grid-template-columns: 260px minmax(0, 1120px);
  gap: 1.5rem;
  align-items: start;
  justify-content: center;
}

.topic-section-wrapper,
.tutorial-section-wrapper {
  grid-template-columns: 260px minmax(0, 1120px);
  width: min(1460px, calc(100vw - 2rem));
}

.tutorial-page-wrapper > .toc {
  display: none;
}

.tutorial-sidebar {
  position: sticky;
  top: 1.25rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
  overflow: hidden;
}

.tutorial-sidebar-header {
  padding: 0.9rem 0.95rem 0.75rem;
  border-bottom: 1px solid var(--border);
}

.tutorial-sidebar-label {
  margin: 0 0 0.25rem;
  color: #c05b4d;
  font-size: 0.78rem;
  font-weight: 700;
}

.tutorial-sidebar-title {
  margin: 0;
  color: var(--text);
  font-size: 1rem;
  font-weight: 650;
  line-height: 1.4;
}

.tutorial-sidebar-title a {
  color: inherit;
}

.tutorial-sidebar-list {
  max-height: calc(100vh - 8rem);
  padding: 0.45rem;
  overflow: auto;
}

.tutorial-sidebar-item {
  display: grid;
  grid-template-columns: 1.7rem minmax(0, 1fr);
  gap: 0.55rem;
  align-items: baseline;
  padding: 0.55rem 0.6rem;
  border-radius: 6px;
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.45;
}

.tutorial-sidebar-item:hover {
  color: var(--accent);
  background: #fcfdff;
}

.tutorial-sidebar-item.is-current {
  color: var(--accent);
  background: #eff6ff;
  font-weight: 600;
}

.tutorial-sidebar-number {
  color: #98a2b3;
  font-family: "SFMono-Regular", SFMono-Regular, ui-monospace, Menlo, Consolas,
    "Liberation Mono", monospace;
  font-size: 0.74rem;
}

.tutorial-sidebar-text {
  min-width: 0;
}

.tutorial-page {
  width: 100%;
  max-width: 1120px;
}

.tutorial-page .post {
  width: 100%;
  max-width: none;
}

.tutorial-section .post-header {
  margin-bottom: 0;
}

.tutorial-section .tutorials-index-description {
  margin-top: 0.75rem;
}

.tutorial-section .post-header .tutorials-index-description {
  margin-right: auto;
  margin-left: auto;
  text-align: center;
}

.tutorial-section .tutorials-lesson-list {
  margin-top: 1.3rem;
}

.tutorial-top-nav {
  margin-bottom: 1rem;
}

.tutorial-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
}

.tutorial-nav-link {
  display: flex;
  min-height: 3rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  line-height: 1.45;
}

.tutorial-nav-link:hover {
  border-color: var(--accent-soft);
  background: #fcfdff;
  color: var(--accent);
}

.tutorial-nav-link.is-disabled {
  visibility: hidden;
}

.tutorial-nav-link.is-prev {
  justify-content: flex-start;
}

.tutorial-nav-link.is-next {
  justify-content: flex-end;
  text-align: right;
}

.tutorial-nav-text {
  display: grid;
  gap: 0.18rem;
}

.tutorial-nav-label {
  color: var(--text-muted);
  font-size: 0.76rem;
  font-weight: 600;
}

.tutorial-nav-title {
  font-size: 0.92rem;
  font-weight: 500;
}

.tutorial-footer-nav {
  margin-top: 2rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--border);
}

.type-system-content .type-system-embedded {
  display: grid;
  gap: 1.4rem;
}

.type-system-content .type-system-embedded > section {
  margin: 0;
}

.type-system-content .grid,
.type-system-content .grid2,
.type-system-content .split,
.type-system-content .timeline,
.type-system-content .memory,
.type-system-content .concept-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
}

.type-system-content .grid:has(> :nth-child(3)),
.type-system-content .timeline,
.type-system-content .memory {
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.type-system-content .card,
.type-system-content .callout,
.type-system-content .step,
.type-system-content .map,
.type-system-content .induction-board,
.type-system-content details {
  padding: 0.95rem 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
}

.type-system-content .card h3,
.type-system-content .callout h3,
.type-system-content .step h3 {
  margin-top: 0;
}

.type-system-content .tag,
.type-system-content .pill {
  display: inline-flex;
  align-items: center;
  min-height: 1.45rem;
  padding: 0 0.45rem;
  border: 1px solid var(--accent-soft);
  border-radius: 999px;
  background: #eff6ff;
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 600;
}

.type-system-content .formula {
  display: inline-block;
  margin: 0.25rem 0;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  background: var(--code-inline-bg);
  color: var(--code-inline-text);
  font-family: "SFMono-Regular", SFMono-Regular, ui-monospace, Menlo, Consolas,
    "Liberation Mono", monospace;
}

.type-system-content .callout {
  border-left: 3px solid var(--accent);
}

.type-system-content .callout.amber,
.type-system-content .callout.warn {
  border-left-color: #c05b4d;
}

.type-system-content .callout.green {
  border-left-color: #0f766e;
}

.type-system-content .mini,
.type-system-content .hint {
  color: var(--text-muted);
  font-size: 0.92rem;
}

.type-system-content .controls,
.type-system-content .quick-nav,
.type-system-content .legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.type-system-content button {
  min-height: 2.1rem;
  padding: 0 0.7rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface-strong);
  color: var(--text);
  font: inherit;
  cursor: pointer;
}

.type-system-content button.active {
  border-color: var(--accent);
  background: var(--accent);
  color: #ffffff;
}

.type-system-content canvas {
  width: 100%;
  height: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface-strong);
}

.type-system-content .quiz label {
  display: block;
  margin: 0.55rem 0;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface-strong);
}

.type-system-content .answer {
  display: none;
  margin-top: 0.75rem;
  padding: 0.75rem;
  border-radius: 8px;
  background: #eff6ff;
  color: var(--accent);
}

.type-system-content .board-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 0.35rem;
}

.type-system-content .cell,
.type-system-content .chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 1.9rem;
  padding: 0.25rem 0.35rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface-strong);
  color: var(--text-muted);
  font-size: 0.82rem;
}

.type-system-content .cell.done {
  background: #eff6ff;
  color: var(--accent);
}

.type-system-content .cell.current {
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 700;
}

.type-system-content .seq {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
  margin: 0.55rem 0;
}

@media screen and (max-width: 1360px) {
  .tutorial-page-wrapper {
    grid-template-columns: 220px minmax(0, 1fr);
    width: min(1180px, calc(100vw - 2rem));
  }
}

@media screen and (max-width: 820px) {
  .tutorial-page-wrapper {
    display: block;
    width: 100%;
    max-width: 100%;
    overflow-x: hidden;
  }

  .tutorial-sidebar {
    position: static;
    width: calc(100% - 2rem);
    margin: 0 auto 1rem;
  }

  .tutorial-sidebar-list {
    max-height: none;
  }

  .tutorial-page {
    max-width: 100%;
  }

  .tutorial-top-nav {
    width: calc(100% - 2rem);
    margin: 0 auto 1rem;
  }

  .tutorial-nav {
    grid-template-columns: 1fr;
  }

  .tutorial-nav-link.is-disabled {
    display: none;
  }

  .tutorials-index {
    width: 100%;
    max-width: 100%;
    padding: 1.25rem;
    border-radius: 0;
    border-left: 0;
    border-right: 0;
  }

  .tutorials-series-card,
  .tutorials-lesson-card {
    grid-template-columns: minmax(0, 1fr);
  }

  .tutorials-series-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-width: 0;
  }

  .type-system-content .grid,
  .type-system-content .grid2,
  .type-system-content .split,
  .type-system-content .timeline,
  .type-system-content .memory,
  .type-system-content .concept-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}