.tutorial-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--color-border);
  background:
    linear-gradient(90deg, transparent, var(--color-water-soft), transparent),
    var(--color-bg);
}

.tutorial-hero::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  content: "";
  background: var(--color-accent-line);
}

.tutorial-hero::after {
  position: absolute;
  right: 7%;
  bottom: -120px;
  width: 320px;
  height: 320px;
  border: 1px dashed var(--color-accent-line);
  border-radius: var(--radius-pill);
  content: "";
}

.tutorial-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(300px, 0.75fr);
  align-items: center;
  min-height: 570px;
  padding-top: 74px;
  padding-bottom: 74px;
  gap: clamp(40px, 7vw, 96px);
}

.tutorial-heading h1 {
  max-width: 9em;
}

.tutorial-heading .lead {
  max-width: 42rem;
}

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

.tutorial-route-card {
  position: relative;
  padding: 30px;
  border: 1px solid var(--color-accent);
  border-top: 6px solid var(--color-error);
  border-radius: var(--radius-small);
  background: var(--color-paper-soft);
  box-shadow: var(--shadow-panel);
}

.tutorial-route-card::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 64px;
  border-left: 1px dashed var(--color-accent-line);
  content: "";
}

.route-card-label {
  display: inline-flex;
  margin-bottom: 22px;
  color: var(--color-error);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.1em;
}

.route-card-list {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.route-card-list li {
  display: grid;
  grid-template-columns: 70px minmax(0, 1fr);
  align-items: center;
  min-height: 58px;
  margin: 0;
  border-bottom: 1px solid var(--color-border);
  gap: 16px;
}

.route-card-list li:last-child {
  border-bottom: 0;
}

.route-card-list span {
  position: relative;
  z-index: 1;
  width: fit-content;
  padding: 4px 7px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
  color: var(--color-success);
  background: var(--color-bg);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 750;
}

.route-card-list strong {
  font-size: 14px;
}

.tutorial-document {
  overflow: visible;
}

.tutorial-reading {
  position: relative;
  max-width: 62rem;
  margin-inline: auto;
}

.guide-step {
  position: relative;
  display: grid;
  grid-template-columns: 104px minmax(0, 1fr);
  padding-top: 60px;
  padding-bottom: 60px;
  border-bottom: 1px solid var(--color-border);
  gap: clamp(24px, 5vw, 58px);
}

.guide-step:first-child {
  padding-top: 18px;
}

.guide-step:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.guide-step::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 51px;
  border-left: 1px dashed var(--color-accent-line);
  content: "";
}

.guide-step:first-child::before {
  top: 18px;
}

.guide-step:last-child::before {
  bottom: 60px;
}

.guide-step-mark {
  position: sticky;
  z-index: 2;
  top: var(--toc-offset);
  display: grid;
  width: 78px;
  min-height: 38px;
  padding: 6px 8px;
  place-items: center;
  align-self: start;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-small);
  color: var(--color-white);
  background: var(--color-accent);
  box-shadow: var(--shadow-button);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.guide-step-content {
  min-width: 0;
}

.guide-step-content > p {
  color: var(--color-muted);
}

.guide-step-content h2 {
  max-width: 15em;
}

.guide-step-action {
  display: flex;
  align-items: center;
  margin-top: 28px;
  padding: 18px;
  border: 1px solid var(--color-border);
  border-left: 5px solid var(--color-success);
  background: var(--color-panel);
  gap: 18px;
}

.guide-step-action span {
  color: var(--color-muted);
  font-size: 13px;
}

.platform-instructions {
  display: grid;
  margin-top: 34px;
  border-top: 1px solid var(--color-border);
}

.platform-instruction {
  position: relative;
  padding: 34px 26px 26px 112px;
  border-bottom: 1px solid var(--color-border);
  background:
    linear-gradient(90deg, var(--color-water-soft), transparent 38%),
    var(--color-bg);
}

.platform-instruction:nth-child(even) {
  background:
    linear-gradient(90deg, var(--color-panel), transparent 38%),
    var(--color-bg);
}

.platform-instruction h3 {
  font-family: var(--font-display);
}

.platform-instruction p {
  color: var(--color-muted);
}

.platform-instruction p:last-child {
  margin-bottom: 0;
}

.platform-name {
  position: absolute;
  top: 38px;
  left: 22px;
  width: 68px;
  padding: 6px 8px;
  overflow: hidden;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-small);
  color: var(--color-accent);
  background: var(--color-bg);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 800;
  text-align: center;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.platform-note {
  margin-top: 28px;
  padding: 20px;
  border: 1px solid var(--color-border);
  background: var(--color-panel);
}

.verification-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 30px;
  border: 1px solid var(--color-border);
  background: var(--color-panel);
}

.verification-strip span {
  position: relative;
  padding: 20px 18px 20px 42px;
  border-right: 1px solid var(--color-border);
  color: var(--color-accent-dark);
  font-size: 13px;
  font-weight: 700;
}

.verification-strip span:last-child {
  border-right: 0;
}

.verification-strip span::before {
  position: absolute;
  top: 20px;
  left: 18px;
  color: var(--color-success);
  content: "✓";
  font-weight: 800;
}

.guide-finish {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 32px;
  padding: 24px;
  border: 1px solid var(--color-accent);
  border-top: 5px solid var(--color-error);
  background: var(--color-water);
  box-shadow: var(--shadow-panel);
  gap: 24px;
}

.guide-finish > div {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

@media (max-width: 900px) {
  .tutorial-hero-inner {
    grid-template-columns: 1fr;
    min-height: 0;
  }

  .tutorial-route-card {
    max-width: 38rem;
  }

  .tutorial-hero::before {
    left: 72%;
  }

  .tutorial-hero::after {
    right: -130px;
  }

  .verification-strip {
    grid-template-columns: 1fr;
  }

  .verification-strip span {
    border-right: 0;
    border-bottom: 1px solid var(--color-border);
  }

  .verification-strip span:last-child {
    border-bottom: 0;
  }
}

@media (max-width: 640px) {
  .tutorial-hero::before,
  .tutorial-hero::after {
    display: none;
  }

  .tutorial-hero-inner {
    padding-top: 54px;
    padding-bottom: 54px;
    gap: 38px;
  }

  .tutorial-route-card {
    padding: 22px 18px;
  }

  .tutorial-route-card::before {
    left: 48px;
  }

  .route-card-list li {
    grid-template-columns: 58px minmax(0, 1fr);
    gap: 10px;
  }

  .route-card-list strong {
    font-size: 13px;
  }

  .guide-step {
    grid-template-columns: 1fr;
    padding-top: 48px;
    padding-bottom: 48px;
    gap: 18px;
  }

  .guide-step::before {
    display: none;
  }

  .guide-step-mark {
    position: static;
    width: fit-content;
    min-width: 72px;
  }

  .guide-step-action,
  .guide-finish {
    align-items: stretch;
    flex-direction: column;
  }

  .guide-step-action .button,
  .guide-finish .button {
    width: 100%;
  }

  .platform-instruction {
    padding: 26px 18px;
  }

  .platform-name {
    position: static;
    display: inline-flex;
    width: auto;
    max-width: 100%;
    margin-bottom: 16px;
  }

  .verification-strip span {
    padding-right: 14px;
  }
}