.tutorial-hero {
  position: relative;
  padding-top: clamp(62px, 9vw, 124px);
  padding-bottom: clamp(48px, 7vw, 88px);
  overflow: hidden;
  border-bottom: var(--line-strong) solid var(--color-text);
  background: var(--color-bg);
}

.tutorial-hero::before,
.tutorial-hero::after {
  position: absolute;
  right: var(--gutter);
  left: var(--gutter);
  height: var(--line-thin);
  pointer-events: none;
  background: var(--color-texture);
  content: "";
}

.tutorial-hero::before {
  top: 24px;
}

.tutorial-hero::after {
  bottom: 24px;
}

.tutorial-hero h1 {
  max-width: 1120px;
  margin-bottom: 24px;
}

.tutorial-hero__lead {
  max-width: 850px;
  color: var(--color-text-muted);
  font-size: clamp(16px, 2vw, 20px);
}

.tutorial-hero__lead p {
  margin-bottom: 22px;
}

.tutorial-hero__actions {
  margin-top: 26px;
}

.platform-line {
  display: flex;
  min-width: 0;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  margin-bottom: 22px;
  border-top: var(--line-strong) solid var(--color-text);
  border-left: var(--line-thin) solid var(--color-border);
  background: var(--color-panel);
}

.platform-line span {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  padding: 7px 13px;
  border-right: var(--line-thin) solid var(--color-border);
  border-bottom: var(--line-thin) solid var(--color-border);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
}

.platform-line .platform-line__label {
  color: var(--color-bg);
  background: var(--color-accent);
}

.tutorial-section {
  scroll-margin-top: calc(var(--header-height) + 20px);
  border-top: var(--line-thin) solid var(--color-texture);
}

.tutorial-section--alternate {
  background: var(--color-panel);
}

.tutorial-step-code {
  display: inline-flex;
  margin-bottom: 14px;
  padding: 4px 9px;
  border-left: 6px solid var(--color-accent);
  color: var(--color-accent);
  background: var(--color-panel-raised);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.tutorial-section .prose > h2:first-of-type {
  margin-top: 0;
}

.tutorial-section .prose h2 {
  border-top-color: var(--color-accent);
}

.tutorial-section .prose p {
  text-wrap: pretty;
}

.completion-list {
  display: grid;
  margin: 0;
  padding: 0;
  border-top: var(--line-strong) solid var(--color-text);
  counter-reset: completion;
  list-style: none;
}

.completion-list li {
  display: grid;
  min-width: 0;
  grid-template-columns: 76px minmax(0, 1fr);
  border-right: var(--line-thin) solid var(--color-border);
  border-bottom: var(--line-thin) solid var(--color-border);
  border-left: var(--line-thin) solid var(--color-border);
  counter-increment: completion;
  background: var(--color-panel);
}

.completion-list li::before {
  display: flex;
  min-height: 100%;
  align-items: center;
  justify-content: center;
  border-right: var(--line-thin) solid var(--color-border);
  color: var(--color-bg);
  background: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 800;
  content: "OK" counter(completion);
}

.completion-list li > div {
  min-width: 0;
  padding: 18px 20px;
}

.completion-list h3 {
  margin-bottom: 6px;
  font-size: 19px;
}

.completion-list p {
  margin-bottom: 0;
  color: var(--color-text-muted);
}

.next-route {
  display: grid;
  grid-template-columns: 112px minmax(0, 1fr) auto;
  align-items: center;
  gap: 22px;
  margin-top: 30px;
  padding: 22px;
  border: var(--line-strong) solid var(--color-accent);
  background: var(--color-bg);
}

.next-route > * {
  min-width: 0;
}

.next-route__label {
  margin-bottom: 0;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.next-route h3 {
  margin-bottom: 6px;
  color: var(--color-accent);
}

.next-route p {
  margin-bottom: 0;
  color: var(--color-text-muted);
}

@media (max-width: 860px) {
  .next-route {
    grid-template-columns: minmax(0, 1fr);
    align-items: start;
  }
}

@media (max-width: 640px) {
  .tutorial-hero {
    padding-top: 52px;
    padding-bottom: 48px;
  }

  .tutorial-hero h1 {
    font-size: clamp(40px, 13vw, 58px);
  }

  .platform-line {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .platform-line span {
    min-width: 0;
  }

  .platform-line .platform-line__label {
    grid-column: 1 / -1;
  }

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

  .completion-list li > div {
    padding: 16px;
  }

  .completion-list li::before {
    font-size: 13px;
  }

  .next-route {
    padding: 18px;
  }

  .next-route .button-row {
    display: grid;
    width: 100%;
  }
}