.tutorial-hero {
  position: relative;
  overflow-x: clip;
  border-bottom: 1px solid var(--color-border);
}

.tutorial-hero::before {
  content: "";
  position: absolute;
  top: 8%;
  right: -12%;
  width: 560px;
  height: 560px;
  border: 1px solid var(--color-accent-line);
  border-radius: 50%;
  box-shadow:
    0 0 0 58px var(--color-grid),
    0 0 0 116px var(--color-grid);
  pointer-events: none;
}

.tutorial-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(340px, 0.68fr);
  align-items: center;
  gap: clamp(34px, 6vw, 84px);
}

.tutorial-hero-copy {
  max-width: 780px;
}

.tutorial-hero-copy h1 {
  max-width: 760px;
}

.tutorial-hero-copy .button-row {
  margin-top: 28px;
}

.tutorial-hero-copy .topic-chips {
  margin-top: 20px;
}

.tutorial-route-board {
  position: relative;
  padding: 14px;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-xl);
  background: var(--color-bg-panel);
  box-shadow: var(--shadow-panel);
  transform: rotate(0.7deg);
}

.tutorial-route-board::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 18px -16px -18px 22px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-bg-panel-2);
}

.route-board-head {
  min-height: 48px;
  padding: 0 12px;
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 0.7rem;
}

.route-board-head code {
  margin-left: auto;
  color: var(--color-accent);
}

.route-board-list {
  margin: 0;
  padding: 14px 0 0;
  display: grid;
  gap: 8px;
  list-style: none;
}

.route-board-list li {
  position: relative;
  min-height: 70px;
  padding: 13px 14px;
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-deep);
}

.route-board-list li:not(:last-child)::after {
  content: "";
  position: absolute;
  z-index: 2;
  bottom: -9px;
  left: 34px;
  width: 2px;
  height: 10px;
  background: var(--color-accent-dark);
}

.route-board-list li:nth-child(2) .route-board-number,
.route-board-list li:nth-child(4) .route-board-number {
  color: var(--color-text);
  border-color: var(--color-warn);
  background: var(--color-warn-dark);
}

.route-board-number {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  border: 1px solid var(--color-accent-dark);
  border-radius: 50%;
  color: var(--color-accent);
  background: var(--color-accent-soft);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 800;
}

.route-board-list strong,
.route-board-list small {
  display: block;
}

.route-board-list strong {
  font-size: 0.92rem;
}

.route-board-list small {
  margin-top: 2px;
  color: var(--color-text-faint);
  font-size: 0.7rem;
}

.tutorial-layout {
  display: grid;
  grid-template-columns: minmax(170px, 0.52fr) minmax(0, 1.8fr) minmax(150px, 0.48fr);
  align-items: start;
  gap: clamp(24px, 4vw, 54px);
}

.tutorial-margin {
  position: sticky;
  top: 26px;
}

.tutorial-margin-code,
.step-index {
  margin-bottom: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-weight: 800;
}

.tutorial-margin-code {
  min-height: 30px;
  padding: 4px 10px;
  border: 1px solid var(--color-accent-dark);
  border-radius: var(--radius-pill);
  background: var(--color-accent-soft);
  font-size: 0.66rem;
  letter-spacing: 0.09em;
}

.step-index {
  width: 54px;
  height: 54px;
  border: 1px solid var(--color-warn);
  border-radius: 50%;
  color: var(--color-text);
  background: var(--color-warn-dark);
  box-shadow: var(--shadow-button);
  font-size: 0.86rem;
}

.tutorial-margin h2 {
  margin-bottom: 12px;
  font-size: clamp(1.55rem, 2.6vw, 2.3rem);
}

.tutorial-margin p {
  margin-bottom: 0;
  font-size: 0.84rem;
}

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

.tutorial-content > h3:first-child {
  margin-top: 0;
}

.tutorial-content p {
  line-height: 1.9;
}

.tutorial-content .callout a,
.tutorial-handbook-note a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-color: var(--color-accent-line);
  text-underline-offset: 0.2em;
}

.tutorial-related {
  position: sticky;
  top: 26px;
  padding: 17px;
  display: grid;
  gap: 10px;
  border-left: 1px solid var(--color-border);
}

.related-label {
  margin-bottom: 4px;
  color: var(--color-text-faint);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.tutorial-related > a {
  padding-bottom: 9px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 0.78rem;
}

.tutorial-related > a:hover {
  color: var(--color-accent);
}

.readiness-grid {
  margin-top: 30px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-border);
}

.readiness-grid > div {
  padding: 20px;
  background: var(--color-bg-panel);
}

.readiness-grid span {
  display: block;
  margin-bottom: 12px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 0.68rem;
}

.readiness-grid strong {
  display: block;
  margin-bottom: 7px;
}

.readiness-grid p {
  margin: 0;
  font-size: 0.78rem;
  line-height: 1.65;
}

.tutorial-step {
  position: relative;
  border-top: 1px solid var(--color-border);
}

.tutorial-step:nth-of-type(even) {
  background:
    linear-gradient(90deg, var(--color-panel-muted), var(--color-transparent) 62%),
    var(--color-transparent);
}

.step-check {
  margin-top: 28px;
  padding: 21px 23px;
  border: 1px solid var(--color-accent-dark);
  border-radius: var(--radius-md);
  background: var(--color-accent-soft);
}

.step-check strong {
  display: block;
  margin-bottom: 10px;
}

.step-check ul {
  margin-bottom: 0;
}

.step-check li + li {
  margin-top: 6px;
}

.mode-comparison {
  margin-top: 30px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.mode-comparison > div {
  padding: 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-panel);
}

.mode-comparison code {
  display: inline-flex;
  margin-bottom: 13px;
  color: var(--color-accent);
  font-size: 0.72rem;
}

.mode-comparison strong {
  display: block;
  margin-bottom: 7px;
}

.mode-comparison p {
  margin-bottom: 0;
  font-size: 0.78rem;
  line-height: 1.65;
}

.related-sequence {
  margin: 0;
  padding-left: 1.2em;
  color: var(--color-text-muted);
  font-size: 0.76rem;
}

.related-sequence li + li {
  margin-top: 7px;
}

.platform-note {
  padding: 10px 0;
  display: grid;
  gap: 2px;
  border-bottom: 1px solid var(--color-border);
}

.platform-note strong {
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

.platform-note span {
  color: var(--color-text-faint);
  font-size: 0.7rem;
}

.verification-board {
  margin-top: 30px;
  display: grid;
  gap: 10px;
}

.verification-board > div {
  padding: 17px 19px;
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  column-gap: 13px;
  align-items: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-panel);
}

.verification-mark {
  width: 38px;
  height: 38px;
  grid-row: 1 / span 2;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  border: 1px solid var(--color-accent-dark);
  border-radius: 50%;
  color: var(--color-accent);
  background: var(--color-accent-soft);
  font-family: var(--font-mono);
  font-weight: 800;
}

.verification-board p {
  margin: 2px 0 0;
  font-size: 0.78rem;
  line-height: 1.55;
}

.troubleshooting-desk {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.trouble-entry {
  position: relative;
  padding: 25px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg-panel);
  box-shadow: var(--shadow-soft);
}

.trouble-entry::after {
  content: "";
  position: absolute;
  right: -32px;
  bottom: -32px;
  width: 90px;
  height: 90px;
  border: 1px solid var(--color-accent-line);
  border-radius: 50%;
}

.trouble-entry:nth-child(2)::after,
.trouble-entry:nth-child(3)::after {
  border-color: var(--color-warn-line);
}

.trouble-code {
  margin-bottom: 16px;
  display: inline-flex;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 800;
  letter-spacing: 0.1em;
}

.trouble-entry h3 {
  font-size: 1.2rem;
}

.trouble-entry p {
  margin-bottom: 0;
  font-size: 0.86rem;
}

.tutorial-handbook-note {
  margin-top: 24px;
}

.completion-strip {
  padding: clamp(24px, 4vw, 38px);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 28px;
  border: 1px solid var(--color-accent-dark);
  border-radius: var(--radius-xl);
  background:
    linear-gradient(120deg, var(--color-accent-soft), var(--color-transparent) 64%),
    var(--color-bg-panel);
  box-shadow: var(--shadow-soft);
}

.completion-label {
  display: block;
  margin-bottom: 10px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 800;
  letter-spacing: 0.1em;
}

.completion-strip h2 {
  margin-bottom: 10px;
  font-size: clamp(1.7rem, 3vw, 2.5rem);
}

.completion-strip p {
  max-width: 760px;
  margin-bottom: 0;
}

@media (max-width: 1080px) {
  .tutorial-hero-grid {
    grid-template-columns: minmax(0, 1fr) minmax(310px, 0.7fr);
  }

  .tutorial-layout {
    grid-template-columns: minmax(160px, 0.5fr) minmax(0, 1.5fr);
  }

  .tutorial-related {
    position: static;
    grid-column: 2;
    padding: 18px 0 0;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    border-top: 1px solid var(--color-border);
    border-left: 0;
  }

  .related-label {
    grid-column: 1 / -1;
  }
}

@media (max-width: 780px) {
  .tutorial-hero-grid,
  .tutorial-layout,
  .completion-strip {
    grid-template-columns: minmax(0, 1fr);
  }

  .tutorial-route-board {
    transform: none;
  }

  .tutorial-margin,
  .tutorial-related {
    position: static;
  }

  .tutorial-margin {
    padding-bottom: 20px;
    border-bottom: 1px solid var(--color-border);
  }

  .tutorial-related {
    grid-column: auto;
  }

  .readiness-grid,
  .mode-comparison {
    grid-template-columns: minmax(0, 1fr);
  }

  .troubleshooting-desk {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 640px) {
  .tutorial-hero::before {
    right: -300px;
    width: 460px;
    height: 460px;
  }

  .tutorial-route-board {
    padding: 10px;
  }

  .tutorial-route-board::before {
    display: none;
  }

  .route-board-head {
    padding-inline: 8px;
  }

  .route-board-list li {
    grid-template-columns: 38px minmax(0, 1fr);
  }

  .route-board-number {
    width: 36px;
    height: 36px;
  }

  .tutorial-related {
    grid-template-columns: minmax(0, 1fr);
  }

  .tutorial-content p {
    line-height: 1.82;
  }

  .readiness-grid > div,
  .mode-comparison > div,
  .trouble-entry {
    padding: 19px;
  }

  .verification-board > div {
    padding: 15px;
    grid-template-columns: 34px minmax(0, 1fr);
  }

  .verification-mark {
    width: 34px;
    height: 34px;
  }
}