.tutorial-hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, .92fr) minmax(420px, 1.08fr);
  gap: 52px;
  align-items: center;
  overflow: hidden;
}

.tutorial-hero::before {
  position: absolute;
  top: 18%;
  right: 7%;
  width: 42%;
  height: 1px;
  content: "";
  background: var(--color-border);
}

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

.tutorial-hero h1 {
  max-width: 680px;
  margin-top: 22px;
  font-size: clamp(3.4rem, 6vw, 5.6rem);
  line-height: .96;
}

.tutorial-hero .lead {
  max-width: 640px;
}

.tutorial-hero-actions {
  margin-top: 28px;
}

.tutorial-facts {
  margin-top: 30px;
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}

.tutorial-reel {
  position: relative;
  min-height: 430px;
  padding: 24px;
  overflow: hidden;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-xl);
  background:
    linear-gradient(135deg, var(--color-panel-raised), var(--color-panel), var(--color-bg));
  box-shadow: var(--shadow-raised);
}

.tutorial-reel::before {
  position: absolute;
  inset: 48px 0 auto;
  height: 1px;
  content: "";
  background: var(--color-border);
}

.tutorial-reel::after {
  position: absolute;
  right: -44px;
  bottom: -44px;
  width: 176px;
  height: 176px;
  content: "";
  border: 1px dashed var(--color-accent);
  border-radius: var(--radius-pill);
}

.reel-header {
  position: relative;
  z-index: 2;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  color: var(--color-text-faint);
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .08em;
}

.reel-path {
  position: relative;
  z-index: 2;
  min-height: 280px;
  padding: 70px 8px 44px;
  display: grid;
  grid-template-columns: auto minmax(20px, 1fr) auto minmax(20px, 1fr) auto minmax(20px, 1fr) auto;
  align-items: center;
}

.reel-stop {
  min-width: 74px;
  display: grid;
  justify-items: center;
  text-align: center;
}

.reel-index {
  width: 46px;
  height: 46px;
  margin-bottom: 14px;
  display: grid;
  place-items: center;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  background: var(--color-panel);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: .8rem;
  box-shadow: var(--shadow-small);
}

.reel-stop.is-active .reel-index {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: var(--color-text);
}

.reel-stop strong {
  font-size: .88rem;
}

.reel-stop small {
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: .55rem;
}

.reel-line {
  position: relative;
  height: 2px;
  margin-top: -48px;
  background: var(--color-border);
}

.reel-line::after {
  position: absolute;
  top: 50%;
  right: 0;
  width: 7px;
  height: 7px;
  content: "";
  transform: translateY(-50%);
  border-radius: var(--radius-pill);
  background: var(--color-accent);
}

.reel-caption {
  position: relative;
  z-index: 2;
  padding: 12px 14px;
  display: flex;
  justify-content: space-between;
  gap: 18px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xs);
  background: var(--color-bg);
  font-family: var(--font-mono);
  font-size: .64rem;
}

.reel-caption span {
  color: var(--color-text-faint);
}

.reel-caption strong {
  text-align: right;
}

.reel-progress {
  position: absolute;
  right: 24px;
  bottom: 18px;
  left: 24px;
  z-index: 2;
  height: 3px;
  background: var(--color-border);
}

.reel-progress span {
  width: 68%;
  height: 100%;
  display: block;
  background: var(--color-accent);
}

.guide-shell {
  position: relative;
}

.guide-layout {
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr);
  gap: 54px;
  align-items: start;
}

.guide-rail {
  position: sticky;
  top: calc(var(--toc-top) + 70px);
  padding: 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
}

.guide-rail-title {
  padding-bottom: 13px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.guide-rail ol {
  margin: 16px 0 20px;
  padding: 0;
  display: grid;
  gap: 4px;
  list-style: none;
  counter-reset: rail-step;
}

.guide-rail li {
  margin: 0;
  counter-increment: rail-step;
}

.guide-rail a {
  min-height: 40px;
  padding: 8px 5px;
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: .8rem;
}

.guide-rail a::before {
  content: counter(rail-step, upper-alpha);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: .66rem;
}

.guide-rail a:hover {
  color: var(--color-text);
}

.guide-rail p {
  margin: 0;
  color: var(--color-text-faint);
  font-size: .72rem;
  line-height: 1.65;
}

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

.guide-chapter {
  position: relative;
  padding-top: 32px;
  padding-bottom: 72px;
  border-bottom: 1px solid var(--color-border);
}

.guide-chapter:first-child {
  padding-top: 0;
}

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

.guide-chapter h2 {
  max-width: 780px;
  margin-top: 9px;
}

.guide-chapter p {
  max-width: 850px;
}

.chapter-marker {
  display: inline-flex;
  padding: 5px 8px;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-xs);
  background: var(--color-accent-soft);
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: .65rem;
  font-weight: 700;
  letter-spacing: .08em;
}

.chapter-action {
  margin-top: 30px;
  padding: 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-panel);
}

.chapter-action div {
  display: grid;
  gap: 4px;
}

.chapter-action strong {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .04em;
  text-transform: uppercase;
}

.chapter-action span {
  color: var(--color-text-muted);
  font-size: .82rem;
}

.platform-instructions {
  margin-top: 30px;
  display: grid;
  gap: 16px;
}

.platform-instruction {
  position: relative;
  padding: 26px 28px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
}

.platform-instruction::after {
  position: absolute;
  top: 0;
  right: 0;
  width: 88px;
  height: 3px;
  content: "";
  background: var(--color-accent);
}

.platform-instruction-head {
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.platform-instruction h3 {
  margin: 0;
}

.platform-symbol {
  width: 44px;
  height: 44px;
  display: grid;
  flex-shrink: 0;
  place-items: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-panel-raised);
  color: var(--color-accent);
}

.platform-symbol svg {
  width: 23px;
  height: 23px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
}

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

.verification-strip {
  margin-top: 34px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-panel);
}

.verification-strip > div {
  padding: 22px;
}

.verification-strip > div + div {
  border-left: 1px solid var(--color-border);
}

.verification-strip strong {
  margin: 6px 0;
  display: block;
}

.verification-strip p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: .8rem;
}

.next-reading {
  margin-top: 34px;
  padding: 28px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 28px;
  align-items: center;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-lg);
  background: var(--color-panel-raised);
}

.next-reading h3 {
  margin-bottom: 10px;
}

.next-reading p {
  margin-bottom: 0;
}

@media (max-width: 980px) {
  .tutorial-hero {
    grid-template-columns: 1fr;
  }

  .tutorial-reel {
    min-height: 390px;
  }

  .guide-layout {
    grid-template-columns: 1fr;
  }

  .guide-rail {
    position: static;
    display: none;
  }
}

@media (max-width: 720px) {
  .tutorial-hero {
    gap: 34px;
  }

  .tutorial-hero h1 {
    font-size: clamp(3rem, 14vw, 4.4rem);
  }

  .tutorial-reel {
    min-height: 0;
    padding: 18px;
    border-radius: var(--radius-lg);
  }

  .reel-path {
    min-height: 0;
    padding: 46px 0 40px;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 8px;
  }

  .reel-line {
    display: none;
  }

  .reel-stop {
    min-width: 0;
  }

  .reel-index {
    width: 38px;
    height: 38px;
  }

  .reel-stop strong {
    font-size: .72rem;
  }

  .reel-stop small {
    display: none;
  }

  .reel-caption {
    display: grid;
  }

  .reel-caption strong {
    text-align: left;
  }

  .guide-chapter {
    padding-top: 24px;
    padding-bottom: 54px;
  }

  .chapter-action {
    align-items: stretch;
    flex-direction: column;
  }

  .chapter-action .button {
    width: 100%;
  }

  .platform-instruction {
    padding: 22px 20px;
  }

  .platform-instruction-head {
    align-items: flex-start;
  }

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

  .verification-strip > div + div {
    border-top: 1px solid var(--color-border);
    border-left: 0;
  }

  .next-reading {
    grid-template-columns: 1fr;
    padding: 22px;
  }

  .next-reading .button-row {
    width: 100%;
  }

  .next-reading .button {
    width: 100%;
  }
}

@media (max-width: 420px) {
  .tutorial-facts {
    display: grid;
    grid-template-columns: 1fr;
  }

  .tutorial-facts .fact-chip {
    width: 100%;
    justify-content: center;
  }

  .tutorial-reel {
    padding-inline: 14px;
  }

  .reel-header {
    font-size: .58rem;
  }

  .reel-index {
    width: 34px;
    height: 34px;
  }

  .platform-instruction-head {
    gap: 12px;
  }

  .platform-symbol {
    width: 38px;
    height: 38px;
  }
}