.tutorial-mast {
  position: relative;
  min-height: 610px;
  overflow: hidden;
  border-bottom: var(--border-heavy) solid var(--color-border);
  background:
    linear-gradient(90deg, var(--color-clear), var(--color-grid)),
    var(--color-bg-deep);
}

.tutorial-mast::before {
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(
      90deg,
      var(--color-clear) 0,
      var(--color-clear) 74px,
      var(--color-grid) 74px,
      var(--color-grid) 75px
    ),
    repeating-linear-gradient(
      0deg,
      var(--color-clear) 0,
      var(--color-clear) 74px,
      var(--color-grid) 74px,
      var(--color-grid) 75px
    );
  content: "";
  pointer-events: none;
}

.tutorial-mast::after {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 46%;
  width: 6px;
  background: repeating-linear-gradient(
    to bottom,
    var(--color-accent) 0,
    var(--color-accent) 18px,
    var(--color-clear) 18px,
    var(--color-clear) 31px
  );
  content: "";
  opacity: 0.42;
}

.tutorial-mast-grid {
  position: relative;
  z-index: 1;
  display: grid;
  min-height: 610px;
  grid-template-columns: minmax(0, 1.05fr) minmax(390px, 0.95fr);
  gap: clamp(32px, 6vw, 88px);
  align-items: center;
  padding-top: 62px;
  padding-bottom: 62px;
}

.tutorial-intro h1 {
  max-width: 760px;
  margin-bottom: 26px;
  font-size: clamp(56px, 6.6vw, 94px);
  line-height: 0.93;
  text-shadow:
    4px 4px 0 var(--color-bg),
    8px 8px 0 var(--color-shadow);
}

.tutorial-lead {
  max-width: 700px;
  margin-bottom: 0;
  padding-left: 18px;
  border-left: 6px solid var(--color-accent);
  color: var(--color-text-muted);
  font-size: 17px;
}

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

.setup-board {
  position: relative;
  min-width: 0;
  border: var(--border-heavy) solid var(--color-border);
  background: var(--color-panel);
  box-shadow: var(--shadow-hard);
}

.setup-board::before,
.setup-board::after {
  position: absolute;
  width: 16px;
  height: 16px;
  border: var(--border-heavy) solid var(--color-border);
  background: var(--color-bg-deep);
  content: "";
}

.setup-board::before {
  top: 9px;
  right: 9px;
}

.setup-board::after {
  right: 9px;
  bottom: 9px;
}

.setup-board-head {
  display: flex;
  min-height: 64px;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 52px 14px 18px;
  border-bottom: var(--border-heavy) solid var(--color-border);
  background: var(--color-panel-dark);
}

.setup-board-head strong {
  font-family: var(--font-display);
  font-size: 15px;
  letter-spacing: 0.06em;
}

.setup-board-head span {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 10px;
}

.setup-sequence {
  margin: 0;
  padding: 20px;
  list-style: none;
}

.setup-sequence li {
  position: relative;
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 14px;
  align-items: center;
  min-height: 76px;
  padding: 10px 0;
  border-bottom: var(--border-fine) solid var(--color-border-soft);
}

.setup-sequence li:last-child {
  border-bottom: 0;
}

.setup-sequence li:not(:last-child)::after {
  position: absolute;
  bottom: -8px;
  left: 24px;
  width: 3px;
  height: 16px;
  background: var(--color-accent);
  content: "";
}

.sequence-index {
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  border: var(--border-heavy) solid var(--color-border);
  background: var(--color-bg-deep);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 800;
}

.setup-sequence strong,
.setup-sequence small {
  display: block;
}

.setup-sequence strong {
  margin-bottom: 4px;
  font-size: 15px;
}

.setup-sequence small {
  font-family: var(--font-mono);
  font-size: 9px;
}

.setup-board-foot {
  display: flex;
  min-height: 50px;
  align-items: center;
  gap: 10px;
  padding: 10px 48px 10px 18px;
  border-top: var(--border-heavy) solid var(--color-border);
  background: var(--color-bg-deep);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 9px;
}

.platform-notes {
  margin-top: 42px;
}

.platform-notes .tab-panel {
  min-height: 190px;
}

.platform-notes .tab-panel h3 {
  margin-bottom: 12px;
}

.platform-notes .tab-panel p {
  max-width: 850px;
  margin-bottom: 0;
  color: var(--color-text-muted);
}

.preparation-grid .card {
  display: grid;
  align-content: start;
}

.preparation-grid .card h3 {
  margin: 17px 0 10px;
  font-size: 22px;
}

.preparation-grid .card p {
  margin: 0;
  color: var(--color-text-muted);
}

.check-code {
  justify-self: start;
  padding: 4px 8px;
  border: var(--border-fine) solid var(--color-accent);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.tutorial-step {
  scroll-margin-top: calc(var(--header-height) + 20px);
  border-top: var(--border-fine) solid var(--color-border-soft);
}

.tutorial-step:nth-of-type(even) {
  background: var(--color-bg-deep);
}

.step-heading {
  display: grid;
  grid-template-columns: 152px minmax(0, 1fr);
  gap: 26px;
  align-items: start;
  margin-bottom: 34px;
  padding-bottom: 22px;
  border-bottom: var(--border-heavy) solid var(--color-border);
}

.step-heading h2 {
  margin-bottom: 14px;
}

.step-heading p {
  max-width: 760px;
  margin: 0;
  color: var(--color-text-muted);
}

.step-plate {
  display: grid;
  min-height: 76px;
  place-items: center;
  border: var(--border-heavy) solid var(--color-accent-dark);
  background: var(--color-accent);
  box-shadow: var(--shadow-small);
  color: var(--color-bg-deep);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.step-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 292px;
  gap: 24px;
  align-items: start;
}

.step-copy h3 {
  margin-top: 34px;
  margin-bottom: 13px;
  padding-top: 22px;
  border-top: var(--border-fine) solid var(--color-border-soft);
}

.step-copy h3:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

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

.step-copy p:last-child {
  margin-bottom: 0;
}

.step-copy a,
.faq-answer a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.step-checklist {
  position: sticky;
  top: 18px;
  min-width: 0;
  padding: 18px;
  border: var(--border-heavy) solid var(--color-border);
  background: var(--color-panel-dark);
  box-shadow: var(--shadow-small);
}

.checklist-title {
  display: block;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: var(--border-heavy) solid var(--color-border);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.step-checklist ul,
.verification-list {
  display: grid;
  gap: 12px;
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
}

.step-checklist li {
  position: relative;
  padding-left: 22px;
  color: var(--color-text-muted);
  font-size: 14px;
}

.step-checklist li::before {
  position: absolute;
  top: 0.7em;
  left: 0;
  width: 9px;
  height: 9px;
  border: var(--border-fine) solid var(--color-accent-dark);
  background: var(--color-accent);
  content: "";
  transform: translateY(-50%);
}

.flow-gate {
  padding: 13px;
  border: var(--border-heavy) solid var(--color-border);
  background: var(--color-bg-deep);
}

.flow-gate span,
.flow-gate strong {
  display: block;
}

.flow-gate span {
  margin-bottom: 7px;
  color: var(--color-border);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.09em;
}

.flow-gate strong {
  font-size: 13px;
  line-height: 1.5;
}

.flow-gate-success {
  border-color: var(--color-success);
}

.flow-gate-success span {
  color: var(--color-success);
}

.state-list {
  display: grid;
  gap: 0;
  margin: 0 0 22px;
}

.state-list div {
  display: flex;
  min-width: 0;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  border-bottom: var(--border-fine) solid var(--color-border-soft);
}

.state-list dt {
  color: var(--color-text-muted);
  font-size: 13px;
}

.state-list dd {
  margin: 0;
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
  text-align: right;
}

.compact-callout {
  margin: 20px 0 0;
  padding: 15px 14px 15px 21px;
  font-size: 13px;
}

.verification-list {
  counter-reset: verify-step;
}

.verification-list li {
  counter-increment: verify-step;
  padding-left: 33px;
}

.verification-list li::before {
  top: 0;
  display: grid;
  width: 23px;
  height: 23px;
  place-items: center;
  border: var(--border-fine) solid var(--color-success);
  background: var(--color-panel);
  color: var(--color-success);
  content: counter(verify-step);
  font-family: var(--font-mono);
  font-size: 9px;
  transform: none;
}

.next-docs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin-top: 42px;
}

.next-docs .panel {
  display: grid;
  align-content: start;
}

.next-docs h3 {
  margin-bottom: 12px;
}

.next-docs p {
  margin-bottom: 22px;
  color: var(--color-text-muted);
}

.next-docs .button {
  justify-self: start;
  margin-top: auto;
}

@media (max-width: 960px) {
  .tutorial-mast-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .tutorial-mast::after {
    left: auto;
    right: 18px;
  }

  .setup-board {
    max-width: 680px;
  }

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

  .step-checklist {
    position: static;
  }
}

@media (max-width: 700px) {
  .tutorial-mast {
    min-height: 0;
  }

  .tutorial-mast-grid {
    min-height: 0;
    padding-top: 38px;
    padding-bottom: 48px;
  }

  .tutorial-intro h1 {
    font-size: clamp(46px, 14vw, 66px);
  }

  .tutorial-lead {
    font-size: 15px;
  }

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

  .setup-board-head {
    align-items: flex-start;
    flex-direction: column;
  }

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

  .step-plate {
    min-height: 48px;
    justify-self: start;
    padding-inline: 16px;
  }

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

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

@media (max-width: 420px) {
  .setup-sequence {
    padding: 14px;
  }

  .setup-sequence li {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 10px;
  }

  .sequence-index {
    width: 40px;
    height: 40px;
  }

  .setup-sequence li:not(:last-child)::after {
    left: 19px;
  }

  .setup-board-foot {
    padding-right: 38px;
  }
}