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

.tutorial-mast {
  position: relative;
  min-height: 520px;
  padding-top: clamp(72px, 9vw, 122px);
  padding-bottom: clamp(76px, 10vw, 136px);
  overflow: hidden;
  border-bottom: 4px solid var(--color-border);
  background:
    linear-gradient(90deg, var(--color-bg), var(--color-bg-panel));
}

.tutorial-mast::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--color-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-grid) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: 0.42;
  mask-image: linear-gradient(to right, var(--color-bg), transparent);
  pointer-events: none;
}

.tutorial-mast-copy {
  width: min(760px, 100%);
  position: relative;
  z-index: 2;
}

.tutorial-mast h1 {
  max-width: 720px;
  margin-bottom: 24px;
}

.tutorial-mast h1::after {
  content: "";
  width: 168px;
  height: 5px;
  margin-top: 22px;
  display: block;
  background: var(--color-accent);
}

.tutorial-actions {
  margin-top: 30px;
}

.tutorial-route {
  width: min(560px, 44vw);
  height: 290px;
  position: absolute;
  right: var(--gutter);
  bottom: 38px;
  z-index: 1;
  border-top: 4px solid var(--color-border);
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  border-left: 1px solid var(--color-border);
  background: var(--color-bg-panel);
  box-shadow: var(--shadow-panel);
}

.tutorial-route::before,
.tutorial-route::after {
  content: "";
  position: absolute;
  pointer-events: none;
}

.tutorial-route::before {
  inset: 0;
  background-image:
    linear-gradient(var(--color-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-grid) 1px, transparent 1px);
  background-size: 42px 42px;
}

.tutorial-route::after {
  width: 70%;
  height: 72%;
  right: -16%;
  bottom: -40%;
  border: 1px solid var(--color-grid-strong);
  border-radius: var(--radius-pill);
}

.tutorial-route-line {
  height: 4px;
  position: absolute;
  top: 50%;
  right: 10%;
  left: 10%;
  z-index: 2;
  background: var(--color-accent);
  transform: translateY(-50%);
}

.tutorial-route-stop {
  width: 20%;
  position: relative;
  z-index: 3;
  top: calc(50% - 16px);
  float: left;
  display: grid;
  justify-items: center;
  gap: 16px;
}

.tutorial-route-stop::before {
  content: "";
  width: 32px;
  height: 32px;
  border: 2px solid var(--color-text);
  border-radius: var(--radius-pill);
  background: var(--color-bg-panel-2);
}

.tutorial-route-stop::after {
  content: "";
  width: 8px;
  height: 8px;
  position: absolute;
  top: 12px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
}

.tutorial-route-stop span {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.tutorial-toc {
  width: calc(100% - (var(--gutter) * 2));
  max-width: var(--content-width);
  margin-inline: auto;
}

.tutorial-intro {
  background: var(--color-bg-panel);
}

.tutorial-intro .callout {
  margin-top: 0;
}

.tutorial-intro-text {
  margin-bottom: 0;
  color: var(--color-text-muted);
}

.tutorial-intro a,
.step-content .text-link,
.platform-guide .text-link,
.import-note a,
.step-content .callout a {
  color: var(--color-text);
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

.step-layout {
  display: grid;
  grid-template-columns: minmax(120px, 0.22fr) minmax(0, 1fr);
  gap: clamp(30px, 7vw, 96px);
}

.step-layout > * {
  min-width: 0;
}

.step-marker {
  align-self: start;
  position: sticky;
  top: var(--toc-clearance);
  padding-top: 16px;
  border-top: 5px solid var(--color-accent);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 760;
  letter-spacing: 0.12em;
}

.step-marker::after {
  content: "";
  width: 100%;
  height: 1px;
  margin-top: 18px;
  display: block;
  background: var(--color-border);
}

.step-content {
  width: 100%;
  max-width: 840px;
}

.step-content-wide {
  max-width: 980px;
}

.step-content > p {
  color: var(--color-text-muted);
  font-size: 17px;
  line-height: 1.9;
}

.step-content > p + p {
  margin-top: 22px;
}

.step-content pre {
  margin-top: 28px;
  margin-bottom: 28px;
}

.step-actions {
  margin-top: 34px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border-soft);
}

.tutorial-platforms {
  margin-top: 12px;
}

.tutorial-platforms [role="tabpanel"] {
  padding-top: 0;
}

.platform-guide {
  min-width: 0;
  padding: clamp(24px, 5vw, 44px);
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  border-left: 1px solid var(--color-border);
  background: var(--color-bg-panel);
}

.platform-guide h3 {
  margin-bottom: 18px;
}

.platform-guide p {
  max-width: 780px;
  color: var(--color-text-muted);
  font-size: 16px;
  line-height: 1.85;
}

.platform-guide .button {
  margin-top: 12px;
}

.platform-label {
  margin-bottom: 10px;
  color: var(--color-accent) !important;
  font-family: var(--font-mono);
  font-size: 12px !important;
  font-weight: 760;
  letter-spacing: 0.12em;
}

.import-note {
  margin-top: 32px;
  margin-bottom: 0;
}

.verification-list {
  margin-top: 36px;
  margin-bottom: 36px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 4px solid var(--color-border);
  border-left: 1px solid var(--color-border);
}

.verification-item {
  min-width: 0;
  padding: 24px;
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg-panel);
}

.verification-item:nth-child(even) {
  background: var(--color-bg-panel-2);
}

.verification-item h3 {
  font-size: 19px;
}

.verification-item p {
  margin-bottom: 0;
  color: var(--color-text-muted);
  font-size: 14px;
}

.tutorial-finish {
  margin-top: 0;
}

@media (max-width: 1100px) {
  .tutorial-mast-copy {
    width: 66%;
  }

  .tutorial-route {
    width: 42vw;
    right: calc(var(--gutter) * -1);
  }
}

@media (max-width: 860px) {
  .tutorial-mast {
    min-height: 620px;
    padding-top: 62px;
    padding-bottom: 260px;
  }

  .tutorial-mast-copy {
    width: 100%;
  }

  .tutorial-route {
    width: calc(100% - (var(--gutter) * 2));
    height: 210px;
    right: var(--gutter);
    bottom: 28px;
  }

  .step-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 26px;
  }

  .step-marker {
    position: static;
  }

  .step-marker::after {
    max-width: 180px;
  }

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

@media (max-width: 640px) {
  .tutorial-mast {
    min-height: 650px;
    padding-top: 48px;
    padding-bottom: 250px;
  }

  .tutorial-mast h1::after {
    width: 112px;
  }

  .tutorial-route {
    height: 190px;
  }

  .tutorial-route-stop {
    gap: 12px;
  }

  .tutorial-route-stop::before {
    width: 26px;
    height: 26px;
  }

  .tutorial-route-stop::after {
    width: 7px;
    height: 7px;
    top: 10px;
  }

  .tutorial-route-stop span {
    font-size: 9px;
    letter-spacing: 0.03em;
  }

  .tutorial-toc {
    width: calc(100% - (var(--gutter) * 2));
  }

  .step-content > p {
    font-size: 16px;
    line-height: 1.82;
  }

  .platform-guide {
    padding: 22px 17px;
  }

  .platform-guide p {
    font-size: 15px;
  }

  .verification-item {
    padding: 21px 17px;
  }
}

@media (max-width: 360px) {
  .tutorial-route {
    width: calc(100% - (var(--gutter) * 2));
  }

  .tutorial-route-stop span {
    letter-spacing: 0;
  }
}