:root {
  --tutorial-line-width: 2px;
  --tutorial-index-width: 112px;
  --tutorial-stage-gap: clamp(28px, 5vw, 72px);
}

.tutorial-hero {
  position: relative;
  overflow-x: clip;
  border-bottom: var(--border-thin) solid var(--color-border);
  background:
    linear-gradient(90deg, transparent, var(--color-accent-faint), transparent),
    var(--color-bg);
}

.tutorial-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 8%;
  bottom: 0;
  width: 34%;
  background:
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 34px,
      var(--color-accent-faint) 35px,
      transparent 36px
    );
  pointer-events: none;
}

.tutorial-hero-grid {
  position: relative;
  min-height: 680px;
  padding-top: clamp(70px, 9vw, 122px);
  padding-bottom: clamp(70px, 9vw, 122px);
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(460px, 0.78fr);
  align-items: center;
  gap: clamp(42px, 7vw, 108px);
}

.tutorial-hero-copy {
  position: relative;
  z-index: 2;
}

.tutorial-hero-copy .lead {
  margin-top: 26px;
  margin-bottom: 0;
}

.tutorial-facts {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tutorial-route {
  position: relative;
  z-index: 2;
  overflow: hidden;
  border: var(--border-thin) solid var(--color-border-bright);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  box-shadow: var(--shadow-window);
}

.tutorial-route::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--color-accent-soft), transparent 38%);
  pointer-events: none;
}

.tutorial-route-head {
  position: relative;
  min-height: 58px;
  padding: 12px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  border-bottom: var(--border-thin) solid var(--color-border);
  background: var(--color-panel-raised);
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: var(--micro-size);
  letter-spacing: 0.05em;
}

.tutorial-route-list {
  position: relative;
  margin: 0;
  padding: 20px;
  list-style: none;
}

.tutorial-route-list::before {
  content: "";
  position: absolute;
  top: 40px;
  bottom: 40px;
  left: 34px;
  border-left: var(--border-thin) dashed var(--color-border-bright);
}

.tutorial-route-list li {
  position: relative;
  min-height: 64px;
  padding: 14px 13px 14px 46px;
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  border-bottom: var(--border-thin) solid var(--color-border);
  color: var(--color-muted);
  font-size: 13px;
}

.tutorial-route-list li::before {
  content: "";
  position: absolute;
  z-index: 2;
  left: 9px;
  width: 9px;
  height: 9px;
  border: var(--border-thin) solid var(--color-accent-dark);
  border-radius: 50%;
  background: var(--color-panel);
  box-shadow: 0 0 0 5px var(--color-panel);
}

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

.tutorial-route-list li.is-confirmed {
  margin-top: 10px;
  border: var(--border-thin) solid var(--color-accent-dark);
  border-radius: var(--radius-sm);
  background: var(--color-accent-soft);
  color: var(--color-text);
}

.tutorial-route-list li.is-confirmed::before {
  background: var(--color-accent);
  box-shadow: 0 0 0 5px var(--color-panel), var(--shadow-accent);
}

.route-code,
.route-state {
  font-family: var(--font-mono);
  font-size: 10px;
}

.route-code {
  color: var(--color-warn);
}

.route-state {
  color: var(--color-accent);
  text-align: right;
}

.tutorial-document {
  position: relative;
  padding-top: 26px;
  padding-bottom: var(--section-space);
}

.tutorial-document .toc-tabs {
  margin-bottom: 18px;
}

.tutorial-stage {
  display: grid;
  grid-template-columns: var(--tutorial-index-width) minmax(0, 1fr);
  gap: var(--tutorial-stage-gap);
}

.stage-index {
  position: relative;
  padding-top: 10px;
  display: flex;
  align-items: flex-start;
  flex-direction: column;
  gap: 4px;
  color: var(--color-subtle);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
}

.stage-index::after {
  content: "";
  width: 100%;
  margin-top: 12px;
  border-top: var(--border-thin) solid var(--color-border-bright);
}

.stage-index span:last-child {
  color: var(--color-accent-dark);
}

.stage-content {
  width: 100%;
  max-width: 920px;
}

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

.stage-content > p a,
.text-link {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-color: var(--color-accent-dark);
  text-underline-offset: 3px;
}

.stage-kicker {
  margin: 0 0 10px;
  color: var(--color-accent) !important;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.stage-content h2 {
  max-width: 760px;
  margin-bottom: 28px;
}

.stage-actions {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 20px;
}

.stage-note {
  color: var(--color-warn);
  font-family: var(--font-mono);
  font-size: 11px;
}

.result-box {
  margin-top: 30px;
  padding: 18px 20px;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  border: var(--border-thin) solid var(--color-border);
  border-radius: var(--radius-sm);
  background: linear-gradient(90deg, var(--color-accent-faint), var(--color-panel));
}

.result-box .status-dot {
  margin-top: 9px;
}

.result-box p {
  margin: 0;
  color: var(--color-muted);
}

.result-box strong {
  color: var(--color-text);
}

.client-guide-grid {
  margin: 36px 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.client-guide {
  padding: clamp(22px, 3vw, 30px);
  border: var(--border-thin) solid var(--color-border);
  border-radius: var(--radius-sm);
  background:
    linear-gradient(145deg, var(--color-accent-faint), transparent 46%),
    var(--color-panel);
}

.client-guide-head {
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 14px;
}

.client-guide-head .platform-icon {
  margin-bottom: 0;
}

.client-guide h3 {
  margin: 2px 0 0;
  font-size: 23px;
}

.client-code {
  margin: 0;
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.07em;
}

.client-guide > p {
  color: var(--color-muted);
  font-size: 15px;
}

.client-guide > p:last-child {
  margin-bottom: 0;
}

.ack-panel {
  margin-top: 34px;
  padding: clamp(22px, 4vw, 34px);
  display: flex;
  align-items: flex-start;
  gap: 17px;
  border: var(--border-thin) solid var(--color-accent);
  border-radius: var(--radius-sm);
  background:
    linear-gradient(90deg, var(--color-accent-soft), transparent),
    var(--color-panel);
  box-shadow: var(--shadow-accent);
}

.ack-panel .ack-light {
  margin-top: 5px;
}

.ack-panel p {
  margin: 0;
  color: var(--color-muted);
}

.ack-panel .ack-panel-code {
  margin-bottom: 7px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 650;
}

.completion-links {
  margin-top: 32px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

@media (max-width: 980px) {
  .tutorial-hero-grid {
    min-height: auto;
    grid-template-columns: minmax(0, 1fr);
  }

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

  .tutorial-route {
    width: 100%;
    max-width: 680px;
  }
}

@media (max-width: 768px) {
  .tutorial-hero::before {
    display: none;
  }

  .tutorial-stage {
    grid-template-columns: minmax(0, 1fr);
    gap: 18px;
  }

  .stage-index {
    padding-top: 0;
    align-items: center;
    flex-direction: row;
  }

  .stage-index::after {
    flex: 1 1 auto;
    width: auto;
    margin-top: 0;
    margin-left: 8px;
  }

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

@media (max-width: 640px) {
  .tutorial-hero-grid {
    padding-top: 52px;
    padding-bottom: 60px;
  }

  .tutorial-route-list {
    padding: 14px;
  }

  .tutorial-route-list::before {
    left: 28px;
  }

  .tutorial-route-list li {
    padding-right: 8px;
    padding-left: 40px;
    grid-template-columns: minmax(54px, 0.55fr) minmax(0, 1fr);
  }

  .tutorial-route-list li::before {
    left: 9px;
  }

  .route-state {
    grid-column: 2;
    text-align: left;
  }

  .stage-actions,
  .completion-links {
    align-items: stretch;
    flex-direction: column;
  }

  .stage-actions .button,
  .completion-links .button {
    width: 100%;
  }

  .stage-actions .text-link,
  .stage-note {
    padding-top: 6px;
  }

  .ack-panel {
    gap: 13px;
  }
}