.tutorial-page {
  min-width: 0;
  counter-reset: none;
}

.tutorial-header .header-inner {
  width: min(calc(100% - 40px), 1440px);
}

.tutorial-header .brand {
  min-height: 44px;
}

.tutorial-mobile-toc {
  display: none;
}

.tutorial-layout {
  width: min(calc(100% - 40px), 1440px);
  margin: 2rem auto 5rem;
  display: grid;
  grid-template-columns: var(--toc-width) minmax(0, var(--content-width));
  justify-content: center;
  align-items: start;
  gap: clamp(1.5rem, 3vw, 3rem);
}

.tutorial-desktop-toc {
  position: sticky;
  top: calc(var(--header-height) + 1.5rem);
  max-height: calc(100vh - var(--header-height) - 3rem);
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 1.1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgb(255 255 255 / 0.86);
  scrollbar-width: thin;
  scrollbar-color: var(--line-strong) transparent;
}

.tutorial-toc-intro {
  margin-bottom: 0.8rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--line);
  display: grid;
  gap: 0.15rem;
}

.tutorial-toc-intro strong {
  color: var(--ink-strong);
  font-size: 0.96rem;
}

.tutorial-toc-intro span {
  color: var(--muted);
  font-size: 0.78rem;
}

.tutorial-desktop-toc nav {
  display: grid;
  gap: 0.25rem;
}

.tutorial-desktop-toc nav a {
  min-height: 44px;
  padding: 0.55rem;
  border-radius: 8px;
  display: grid;
  grid-template-columns: 2.7rem minmax(0, 1fr);
  align-items: center;
  gap: 0.4rem;
  color: var(--muted);
  font-size: 0.79rem;
  font-weight: 680;
  line-height: 1.35;
  text-decoration: none;
}

.tutorial-desktop-toc nav a span {
  color: var(--accent-dark);
  font-size: 0.72rem;
  font-variant-numeric: tabular-nums;
}

.tutorial-desktop-toc nav a:hover,
.tutorial-desktop-toc nav a[aria-current="location"] {
  color: var(--ink-strong);
  background: var(--accent-soft);
}

.tutorial-desktop-toc nav a[aria-current="location"]::after {
  content: "目前單元";
  grid-column: 2;
  color: var(--accent-dark);
  font-size: 0.7rem;
  font-weight: 760;
}

.tutorial-desktop-toc nav .tutorial-toc-meta-link {
  grid-template-columns: 1fr;
  border-top: 1px solid var(--line);
  border-radius: 0;
  color: var(--accent-dark);
}

.tutorial-content {
  width: 100%;
  min-width: 0;
}

.tutorial-hero,
.learning-map,
.tutorial-reference-section {
  min-width: 0;
  margin-bottom: 1.75rem;
  padding: clamp(1.5rem, 4vw, 3.5rem);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.tutorial-reference-section {
  scroll-margin-top: calc(var(--header-height) + 1.25rem);
}

.tutorial-hero {
  min-height: min(620px, calc(100dvh - var(--header-height) - 3rem));
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(17rem, 0.75fr);
  align-items: center;
  gap: clamp(1.5rem, 5vw, 4.5rem);
  scroll-margin-top: calc(var(--header-height) + 1.25rem);
}

.tutorial-hero-copy {
  min-width: 0;
}

.tutorial-kicker {
  margin-bottom: 0.6rem;
  color: var(--accent-dark);
  font-size: 0.82rem;
  font-weight: 760;
  letter-spacing: 0.03em;
}

.tutorial-hero h1 {
  max-width: 13ch;
  font-size: clamp(2.35rem, 5vw, 4.1rem);
}

.tutorial-promise {
  max-width: 31rem;
  margin-bottom: 1.5rem;
  color: var(--muted);
  font-size: 1.08rem;
  line-height: 1.68;
}

.tutorial-hero-actions,
.source-boundary-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.tutorial-baseline {
  padding: 1.3rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface-soft);
}

.tutorial-baseline strong {
  display: block;
  margin-bottom: 0.65rem;
  color: var(--ink-strong);
  font-size: 1rem;
}

.tutorial-baseline ul {
  margin: 0;
}

.tutorial-baseline li {
  color: var(--muted);
  font-size: 0.9rem;
}

.section-heading {
  margin-bottom: 1.6rem;
}

.section-heading h2 {
  max-width: 19ch;
}

.section-heading p {
  margin-bottom: 0;
  color: var(--muted);
}

.learning-route {
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  list-style: none;
  counter-reset: learning-route;
}

.learning-route li {
  min-width: 0;
  margin: 0;
  counter-increment: learning-route;
}

.learning-route li:nth-child(4n + 2),
.learning-route li:nth-child(4n + 3) {
  background: var(--surface-soft);
}

.learning-route a {
  min-height: 94px;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  display: grid;
  grid-template-columns: 2.25rem minmax(0, 1fr);
  align-content: center;
  column-gap: 0.7rem;
  color: var(--ink);
  text-decoration: none;
}

.learning-route a::before {
  content: counter(learning-route, decimal-leading-zero);
  grid-row: 1 / span 2;
  color: var(--accent-dark);
  font-size: 0.78rem;
  font-variant-numeric: tabular-nums;
  font-weight: 800;
}

.learning-route a:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.learning-route strong,
.learning-route span {
  min-width: 0;
  display: block;
}

.learning-route strong {
  color: var(--ink-strong);
  font-size: 0.96rem;
}

.learning-route span {
  margin-top: 0.2rem;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.45;
}

.tutorial-unit {
  min-width: 0;
  margin-bottom: 4.5rem;
  scroll-margin-top: calc(var(--header-height) + 1.25rem);
}

.unit-header {
  margin-bottom: 1.4rem;
  padding: 0.35rem 0 1.4rem;
  border-bottom: 2px solid var(--line-strong);
}

.unit-range {
  margin-bottom: 0.35rem;
  color: var(--accent-dark);
  font-size: 0.78rem;
  font-weight: 780;
  letter-spacing: 0.02em;
}

.unit-header h2 {
  max-width: 18ch;
}

.unit-header > p:last-child {
  margin-bottom: 0;
  color: var(--muted);
}

.tutorial-lesson {
  min-width: 0;
  margin-bottom: 1.25rem;
  padding: clamp(1.25rem, 3.5vw, 2.6rem);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 10px 28px rgb(28 78 70 / 0.045);
  scroll-margin-top: calc(var(--header-height) + 1.25rem);
}

.lesson-heading {
  margin-bottom: 1.25rem;
}

.lesson-chapter {
  display: block;
  margin-bottom: 0.4rem;
  color: var(--accent-dark);
  font-size: 0.78rem;
  font-weight: 780;
  font-variant-numeric: tabular-nums;
}

.lesson-heading h3 {
  max-width: 27ch;
  margin-bottom: 0;
  font-size: clamp(1.35rem, 2.4vw, 1.8rem);
}

.lesson-section {
  max-width: 68ch;
  margin-top: 1.3rem;
  padding-top: 1.3rem;
  border-top: 1px solid var(--line);
}

.lesson-section h4 {
  margin: 0 0 0.65rem;
  color: var(--ink-strong);
  font-size: 1rem;
  line-height: 1.35;
}

.lesson-section p:last-child,
.lesson-section ol:last-child,
.lesson-section dl:last-child {
  margin-bottom: 0;
}

.lesson-summary,
.analogy-box,
.misconception-box {
  max-width: none;
  padding: 1rem 1.1rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
}

.lesson-summary {
  margin-top: 0;
  border-left: 4px solid var(--accent);
  background: var(--accent-soft);
}

.analogy-box {
  background: #f7fbfa;
}

.misconception-box {
  border-color: #e8c7c3;
  border-left: 4px solid var(--alert);
  background: var(--alert-soft);
}

.analogy-limit {
  color: var(--muted);
  font-size: 0.9rem;
}

.plain-steps,
.security-layers,
.delivery-gates {
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.65rem;
  list-style: none;
  counter-reset: plain-step;
}

.plain-steps li,
.security-layers li,
.delivery-gates li {
  min-width: 0;
  margin: 0;
  padding: 0.85rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--muted);
  background: #f9fbfb;
  font-size: 0.92rem;
  line-height: 1.55;
}

.plain-steps li {
  counter-increment: plain-step;
  display: grid;
  grid-template-columns: 1.65rem minmax(0, 1fr);
  align-items: start;
  column-gap: 0.45rem;
}

.plain-steps li::before {
  content: counter(plain-step, decimal-leading-zero);
  color: var(--accent-dark);
  font-size: 0.72rem;
  font-weight: 800;
}

.security-layers strong,
.delivery-gates strong {
  color: var(--ink-strong);
}

.term-list,
.responsibility-list {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.65rem;
}

.term-list > div,
.responsibility-list > div {
  min-width: 0;
  padding: 0.85rem;
  border-radius: var(--radius);
  background: var(--surface-muted);
}

.term-list dt,
.responsibility-list dt {
  margin-bottom: 0.25rem;
  color: var(--ink-strong);
  font-size: 0.9rem;
  font-weight: 780;
}

.term-list dd,
.responsibility-list dd {
  margin: 0;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.5;
}

.comparison-strip,
.sensitivity-grid,
.license-grid,
.cost-examples {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.65rem;
}

.comparison-strip > div,
.sensitivity-grid > div,
.license-grid > div,
.cost-examples > div {
  min-width: 0;
  padding: 0.9rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #f9fbfb;
}

.comparison-strip strong,
.comparison-strip span,
.sensitivity-grid strong,
.sensitivity-grid span,
.license-grid strong,
.license-grid span,
.cost-examples strong,
.cost-examples span {
  display: block;
}

.comparison-strip strong,
.sensitivity-grid strong,
.license-grid strong,
.cost-examples strong {
  margin-bottom: 0.3rem;
  color: var(--ink-strong);
  font-size: 0.9rem;
}

.comparison-strip span,
.sensitivity-grid span,
.license-grid span,
.cost-examples span {
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.5;
}

.lesson-check {
  max-width: 68ch;
  margin-top: 1.3rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface-soft);
}

.lesson-check summary {
  min-height: 48px;
  padding: 0.8rem 2.6rem 0.8rem 1rem;
  position: relative;
  display: flex;
  align-items: center;
  color: var(--ink-strong);
  font-size: 0.92rem;
  font-weight: 740;
  line-height: 1.5;
  list-style: none;
  cursor: pointer;
}

.lesson-check summary::-webkit-details-marker {
  display: none;
}

.lesson-check summary::after {
  content: "+";
  position: absolute;
  right: 1rem;
  color: var(--accent-dark);
  font-size: 1.2rem;
}

.lesson-check[open] summary::after {
  content: "−";
}

.lesson-check p {
  max-width: none;
  margin: 0;
  padding: 0 1rem 1rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.lesson-source {
  margin-top: 1.2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.lesson-source a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  color: var(--accent-dark);
  font-size: 0.9rem;
  font-weight: 760;
}

.glossary-grid {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.glossary-entry {
  min-width: 0;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #f9fbfb;
}

.glossary-entry dt {
  margin-bottom: 0.55rem;
  color: var(--ink-strong);
  font-size: 1rem;
  font-weight: 790;
}

.glossary-entry dd {
  margin: 0;
  display: grid;
  gap: 0.35rem;
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.5;
}

.glossary-entry dd span {
  display: block;
}

.glossary-entry dd .glossary-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.75rem;
}

.glossary-links a {
  color: var(--accent-dark);
  font-weight: 740;
}

.coverage-list {
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.55rem;
  list-style: none;
}

.coverage-list li {
  min-width: 0;
  min-height: 54px;
  margin: 0;
  padding: 0.65rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  display: grid;
  grid-template-columns: 2rem minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.55rem;
  background: #f9fbfb;
}

.coverage-list li > span {
  color: var(--accent-dark);
  font-size: 0.78rem;
  font-variant-numeric: tabular-nums;
  font-weight: 800;
}

.coverage-list a {
  min-width: 0;
  color: var(--ink);
  font-size: 0.84rem;
  line-height: 1.4;
}

.coverage-list a:last-child {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  color: var(--accent-dark);
  font-weight: 740;
  white-space: nowrap;
}

.source-boundary {
  border-left: 4px solid var(--accent);
  background: var(--surface-soft);
}

.tutorial-disclaimer {
  max-width: 68ch;
  margin: 1.25rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.tutorial-footer {
  padding: 1rem 0 0;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  color: var(--muted);
  font-size: 0.8rem;
}

.tutorial-back-to-top {
  border-radius: var(--radius);
}

@media (max-width: 1199px) {
  .tutorial-desktop-toc {
    display: none;
  }

  .tutorial-mobile-toc {
    width: min(calc(100% - 40px), var(--content-width));
    margin: 0 auto;
    display: block;
  }

  .tutorial-mobile-toc summary {
    min-height: 48px;
    padding: 0.75rem 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    color: var(--ink-strong);
    font-weight: 730;
    cursor: pointer;
    list-style: none;
  }

  .tutorial-mobile-toc summary::-webkit-details-marker {
    display: none;
  }

  .tutorial-mobile-toc summary::after {
    content: "+";
    color: var(--accent-dark);
    font-size: 1.2rem;
  }

  .tutorial-mobile-toc[open] summary::after {
    content: "−";
  }

  .tutorial-mobile-toc nav {
    max-height: min(62vh, 620px);
    overflow-y: auto;
    overscroll-behavior: contain;
    padding: 0.5rem 0 1rem;
    border-top: 1px solid var(--line);
    display: grid;
    gap: 0.2rem;
  }

  .tutorial-mobile-toc nav a {
    min-height: 44px;
    padding: 0.55rem 0;
    display: grid;
    grid-template-columns: 3rem minmax(0, 1fr);
    align-items: center;
    gap: 0.4rem;
    color: var(--muted);
    font-size: 0.84rem;
    font-weight: 680;
    text-decoration: none;
  }

  .tutorial-mobile-toc nav a span {
    color: var(--accent-dark);
    font-size: 0.74rem;
  }

  .tutorial-mobile-toc nav a[aria-current="location"] {
    color: var(--ink-strong);
    background: var(--accent-soft);
  }

  .tutorial-mobile-toc nav .tutorial-mobile-technical-link {
    grid-template-columns: 1fr;
    margin-bottom: 0.35rem;
    border-bottom: 1px solid var(--line);
    color: var(--accent-dark);
    font-weight: 760;
  }

  .tutorial-layout {
    width: min(calc(100% - 40px), var(--content-width));
    margin-top: 1.5rem;
    display: block;
  }

  .tutorial-reference-section {
    scroll-margin-top: calc(var(--header-height) + 4.5rem);
  }
}

@media (max-width: 767px) {
  .tutorial-header .header-inner,
  .tutorial-mobile-toc,
  .tutorial-layout {
    width: calc(100% - 32px);
  }

  .tutorial-layout {
    margin-top: 1rem;
  }

  .tutorial-hero,
  .learning-map,
  .tutorial-reference-section {
    margin-bottom: 1rem;
    padding: 1.35rem 1rem;
  }

  .tutorial-hero {
    min-height: 0;
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

  .tutorial-hero h1 {
    max-width: 14ch;
    font-size: clamp(2.05rem, 10vw, 3rem);
  }

  .tutorial-promise {
    font-size: 1rem;
  }

  .tutorial-hero-actions,
  .source-boundary-actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .tutorial-hero-actions .action-button,
  .source-boundary-actions .action-button {
    width: 100%;
  }

  .learning-route,
  .plain-steps,
  .security-layers,
  .delivery-gates,
  .term-list,
  .responsibility-list,
  .comparison-strip,
  .sensitivity-grid,
  .license-grid,
  .cost-examples,
  .glossary-grid,
  .coverage-list {
    grid-template-columns: 1fr;
  }

  .tutorial-unit {
    margin-bottom: 3rem;
  }

  .unit-header {
    padding-inline: 0.15rem;
  }

  .tutorial-lesson {
    margin-bottom: 1rem;
    padding: 1.25rem 1rem;
  }

  .lesson-section {
    max-width: none;
  }

  .lesson-summary,
  .analogy-box,
  .misconception-box {
    padding: 0.9rem;
  }

  .coverage-list li {
    grid-template-columns: 2rem minmax(0, 1fr);
  }

  .coverage-list a:last-child {
    grid-column: 2;
  }

  .tutorial-footer {
    display: grid;
    gap: 0.35rem;
  }
}

@media (max-width: 767px), (hover: none) and (pointer: coarse) {
  .glossary-entry dd .glossary-links a,
  .coverage-list a {
    min-height: 44px;
    padding-block: 0.45rem;
    display: inline-flex;
    align-items: center;
  }
}

@media (max-width: 359px) {
  .tutorial-hero,
  .learning-map,
  .tutorial-reference-section,
  .tutorial-lesson {
    padding-right: 0.85rem;
    padding-left: 0.85rem;
  }

  .learning-route a {
    grid-template-columns: 1.85rem minmax(0, 1fr);
    padding: 0.85rem;
  }

  .lesson-check summary {
    padding-left: 0.85rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .tutorial-page *,
  .tutorial-page *::before,
  .tutorial-page *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

@media print {
  .tutorial-page .site-header,
  .tutorial-desktop-toc,
  .tutorial-mobile-toc,
  .tutorial-back-to-top,
  .tutorial-hero-actions,
  .source-boundary-actions,
  .tutorial-page .skip-link {
    display: none !important;
  }

  .tutorial-layout {
    width: auto;
    margin: 0;
    display: block;
  }

  .tutorial-hero,
  .learning-map,
  .tutorial-reference-section,
  .tutorial-lesson {
    margin: 0 0 8mm;
    padding: 0;
    border: 0;
    box-shadow: none;
    background: #fff;
  }

  .tutorial-hero {
    min-height: 0;
    display: block;
  }

  .tutorial-baseline,
  .lesson-summary,
  .analogy-box,
  .misconception-box,
  .lesson-check,
  .source-boundary {
    color: var(--ink);
    border-color: #cfd9d7;
    background: #fff;
  }

  .tutorial-unit {
    margin-bottom: 10mm;
  }

  .unit-header,
  .lesson-heading,
  .lesson-section h4,
  .lesson-check,
  .glossary-entry,
  .coverage-list li {
    break-inside: avoid-page;
  }

  .tutorial-lesson {
    break-inside: auto;
  }

  .lesson-section,
  .lesson-check {
    max-width: none;
  }

  .lesson-check > * {
    display: block !important;
  }

  .lesson-check summary {
    min-height: 0;
    padding: 3mm 0;
  }

  .lesson-check summary::after {
    display: none;
  }

  .lesson-check p {
    padding: 0 0 3mm;
  }

  .lesson-source a::after,
  .source-boundary a::after {
    content: " (" attr(href) ")";
    color: var(--muted);
    font-size: 7pt;
    overflow-wrap: anywhere;
  }

  .glossary-entry dd .glossary-links {
    display: block;
  }

  .glossary-entry dd .glossary-links a,
  .coverage-list a {
    min-height: 0;
    padding: 0;
    display: inline;
  }

  .glossary-links a + a::before {
    content: "、";
    color: var(--muted);
  }

  .learning-route,
  .plain-steps,
  .security-layers,
  .delivery-gates,
  .term-list,
  .responsibility-list,
  .comparison-strip,
  .sensitivity-grid,
  .license-grid,
  .cost-examples,
  .glossary-grid,
  .coverage-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .tutorial-footer {
    font-size: 8pt;
  }
}