:root {
  --tutorial-copy-max: 960px;
  --tutorial-hero-max: 780px;
  --tutorial-orbit-size: 420px;
  --tutorial-orbit-core-size: 76px;
  --tutorial-step-mark-size: 44px;
  --tutorial-platform-icon-size: 30px;
  --tutorial-link-min: 220px;
}

.page-tutorial {
  background:
    radial-gradient(circle at 82% 6%, var(--color-cyan-wash), transparent 28%),
    radial-gradient(circle at 10% 22%, var(--color-pink-wash), transparent 24%),
    var(--color-bg);
}

.tutorial-hero {
  position: relative;
  min-height: 620px;
  overflow: hidden;
  border-bottom: var(--border-thin) solid var(--color-line-faint);
}

.tutorial-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 8% 18%, var(--color-star-strong) 0 1px, transparent 2px),
    radial-gradient(circle at 18% 72%, var(--color-star-soft) 0 1px, transparent 2px),
    radial-gradient(circle at 34% 13%, var(--color-star-mid) 0 1px, transparent 2px),
    radial-gradient(circle at 61% 25%, var(--color-star-soft) 0 1px, transparent 2px),
    radial-gradient(circle at 78% 67%, var(--color-star-strong) 0 1px, transparent 2px),
    radial-gradient(circle at 92% 18%, var(--color-star-mid) 0 1px, transparent 2px);
}

.tutorial-hero-inner {
  position: relative;
  z-index: 2;
  display: flex;
  min-height: 620px;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  padding-top: 76px;
  padding-bottom: 76px;
}

.tutorial-hero h1 {
  max-width: var(--tutorial-hero-max);
  margin-top: 22px;
  margin-bottom: 20px;
}

.tutorial-hero h1 .keyword-lock {
  color: var(--color-warning);
}

.tutorial-hero-copy {
  max-width: 660px;
  margin-bottom: 0;
  color: var(--color-muted);
  font-size: 19px;
  line-height: 1.9;
}

.tutorial-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.tutorial-fact-row {
  display: flex;
  max-width: 760px;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-top: 24px;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 12px;
}

.tutorial-fact-row span {
  position: relative;
  padding-left: 14px;
}

.tutorial-fact-row span::before {
  content: "";
  position: absolute;
  top: 0.72em;
  left: 0;
  width: 5px;
  height: 5px;
  border-radius: var(--radius-pill);
  background: var(--color-success);
}

.tutorial-orbit {
  position: absolute;
  top: 50%;
  right: -90px;
  width: var(--tutorial-orbit-size);
  height: var(--tutorial-orbit-size);
  border: var(--border-thin) solid var(--color-line-soft);
  border-radius: var(--radius-pill);
  opacity: 0.72;
  transform: translateY(-50%) rotate(-16deg);
}

.tutorial-orbit::before,
.tutorial-orbit::after {
  content: "";
  position: absolute;
  border: var(--border-thin) solid var(--color-line-faint);
  border-radius: var(--radius-pill);
}

.tutorial-orbit::before {
  inset: 54px;
}

.tutorial-orbit::after {
  inset: 112px;
  border-color: var(--color-line-soft);
}

.tutorial-orbit-core {
  position: absolute;
  top: 50%;
  left: 50%;
  width: var(--tutorial-orbit-core-size);
  height: var(--tutorial-orbit-core-size);
  border: var(--border-thin) solid var(--color-warning);
  border-radius: var(--radius-sm);
  background: var(--color-panel-strong);
  box-shadow: var(--shadow-cyan);
  transform: translate(-50%, -50%) rotate(16deg);
}

.tutorial-orbit-core::before {
  content: "";
  position: absolute;
  top: 13px;
  right: 13px;
  width: 8px;
  height: 8px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  box-shadow: 0 0 8px var(--color-pink-led);
}

.tutorial-orbit-node {
  position: absolute;
  width: 13px;
  height: 13px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-panel-strong);
  box-shadow: var(--shadow-cyan);
}

.tutorial-orbit-node-a {
  top: 62px;
  left: 92px;
}

.tutorial-orbit-node-b {
  right: 32px;
  bottom: 126px;
}

.tutorial-orbit-node-c {
  bottom: 36px;
  left: 126px;
  border-color: var(--color-warning);
}

.tutorial-flow {
  max-width: calc(var(--tutorial-copy-max) + var(--gutter) * 2);
  padding-top: 42px;
  padding-bottom: var(--section-space);
}

.tutorial-flow > .toc-tabs {
  margin-bottom: 34px;
}

.tutorial-step {
  position: relative;
  display: grid;
  grid-template-columns: var(--tutorial-step-mark-size) minmax(0, 1fr);
  gap: 22px;
  padding-top: 46px;
  padding-bottom: 54px;
}

.tutorial-step + .tutorial-step {
  border-top: var(--border-thin) solid var(--color-line-faint);
}

.tutorial-step-mark {
  position: sticky;
  top: var(--toc-offset);
  display: flex;
  width: var(--tutorial-step-mark-size);
  height: var(--tutorial-step-mark-size);
  align-items: center;
  justify-content: center;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-panel-strong);
  color: var(--color-warning);
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 800;
  box-shadow: var(--shadow-cyan);
}

.tutorial-step-body {
  min-width: 0;
}

.tutorial-step-code {
  display: block;
  margin-bottom: 10px;
  color: var(--color-line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.09em;
}

.tutorial-step h2 {
  margin-bottom: 22px;
}

.tutorial-step h3 {
  scroll-margin-top: var(--toc-offset);
}

.tutorial-step p {
  color: var(--color-muted);
}

.tutorial-step pre {
  margin-top: 24px;
  margin-bottom: 24px;
}

.tutorial-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 28px;
}

.tutorial-text-link {
  color: var(--color-line);
  font-weight: 750;
}

.tutorial-text-link:hover {
  color: var(--color-warning);
}

.platform-instruction-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 30px;
  margin-bottom: 30px;
}

.platform-instruction {
  min-width: 0;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-panel);
  background: var(--color-panel);
  padding: 24px;
  box-shadow: var(--shadow-cyan);
}

.platform-instruction-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.platform-instruction-head svg {
  width: var(--tutorial-platform-icon-size);
  height: var(--tutorial-platform-icon-size);
  flex: 0 0 auto;
  fill: currentColor;
  color: var(--color-warning);
}

.platform-instruction-head h3 {
  margin-bottom: 0;
  font-size: 22px;
}

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

.tutorial-step-import .callout a {
  color: var(--color-line);
  text-decoration: underline;
  text-decoration-color: var(--color-line-soft);
  text-underline-offset: 0.2em;
}

.tutorial-step-final {
  padding-bottom: 20px;
}

.tutorial-link-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(var(--tutorial-link-min), 1fr));
  gap: 16px;
  margin-top: 30px;
}

.tutorial-link-card {
  display: flex;
  min-width: 0;
  flex-direction: column;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-panel);
  background: var(--color-panel);
  padding: 22px;
  box-shadow: var(--shadow-cyan);
  transition:
    transform var(--transition-fast),
    border-color var(--transition-fast),
    background var(--transition-fast);
}

.tutorial-link-card:hover {
  border-color: var(--color-warning);
  background: var(--color-panel-strong);
  transform: translateY(-2px);
}

.tutorial-link-card strong {
  margin-bottom: 8px;
  font-size: 20px;
}

.tutorial-link-card > span:last-child {
  color: var(--color-line);
  font-size: 14px;
}

.tutorial-link-code {
  margin-bottom: 12px;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
}

@media (max-width: 1080px) {
  .tutorial-orbit {
    right: -190px;
    opacity: 0.48;
  }

  .tutorial-hero-copy,
  .tutorial-fact-row {
    max-width: 620px;
  }
}

@media (max-width: 768px) {
  .tutorial-hero,
  .tutorial-hero-inner {
    min-height: auto;
  }

  .tutorial-hero-inner {
    align-items: center;
    padding-top: 64px;
    padding-bottom: 64px;
    text-align: center;
  }

  .tutorial-hero-actions {
    width: 100%;
    flex-direction: column;
    align-items: center;
  }

  .tutorial-hero-actions .btn {
    width: 100%;
    max-width: 340px;
  }

  .tutorial-fact-row {
    justify-content: center;
  }

  .tutorial-orbit {
    display: none;
  }

  .tutorial-flow {
    padding-top: 28px;
  }

  .tutorial-step {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
    padding-top: 38px;
    padding-bottom: 44px;
  }

  .tutorial-step-mark {
    position: static;
  }

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

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

@media (max-width: 480px) {
  .tutorial-hero-copy {
    font-size: 17px;
  }

  .tutorial-fact-row {
    align-items: flex-start;
    flex-direction: column;
    text-align: left;
  }

  .tutorial-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .tutorial-actions .btn {
    width: 100%;
  }

  .platform-instruction {
    padding: 20px;
  }
}