.tutorial-hero {
  min-height: calc(100vh - var(--header-height));
  border-bottom: 1px solid var(--color-border-light);
}

.tutorial-hero::before {
  position: absolute;
  inset: 0;
  content: "";
  pointer-events: none;
  background:
    linear-gradient(90deg, var(--color-transparent), var(--color-success-glow-soft), var(--color-transparent)),
    repeating-linear-gradient(90deg, var(--color-transparent) 0 54px, var(--color-brick-highlight) 54px 55px);
}

.tutorial-hero-grid {
  position: relative;
  display: grid;
  min-height: 470px;
  grid-template-columns: minmax(0, 1.15fr) minmax(340px, 0.85fr);
  gap: clamp(38px, 7vw, 96px);
  align-items: center;
}

.tutorial-intro {
  min-width: 0;
}

.tutorial-intro h1 {
  max-width: 900px;
  font-size: clamp(52px, 7.2vw, 94px);
}

.tutorial-lead {
  max-width: 760px;
  margin-bottom: 28px;
  font-size: clamp(16px, 2vw, 20px);
}

.tutorial-route {
  position: relative;
  display: grid;
  min-width: 0;
  padding: 28px;
  gap: 13px;
  border: 1px solid var(--color-border-light);
  border-left: 4px solid var(--color-success);
  border-radius: var(--radius-small);
  background: linear-gradient(145deg, var(--color-bg-panel-2), var(--color-bg-deep));
  box-shadow: var(--shadow-frame);
}

.tutorial-route::before {
  position: absolute;
  top: 54px;
  bottom: 54px;
  left: 59px;
  width: 2px;
  content: "";
  background: var(--color-success);
  box-shadow: 0 0 12px var(--color-success-glow);
}

.route-stage {
  position: relative;
  z-index: 1;
  display: flex;
  min-width: 0;
  min-height: 68px;
  padding: 11px 14px;
  align-items: center;
  gap: 17px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
  background: var(--color-bg-panel);
}

.route-stage.is-current {
  border-color: var(--color-accent);
  background: var(--color-bg-panel-2);
  box-shadow: var(--shadow-button);
}

.route-index {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  flex-shrink: 0;
  border: 1px solid var(--color-success);
  border-radius: var(--radius-circle);
  color: var(--color-bg-deep);
  background: var(--color-success);
  box-shadow: 0 0 12px var(--color-success-glow);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 800;
}

.route-stage.is-current .route-index {
  border-color: var(--color-accent-soft);
  background: var(--color-accent);
  box-shadow: 0 0 14px var(--color-accent-glow);
}

.route-stage strong,
.route-stage small {
  display: block;
}

.route-stage strong {
  color: var(--color-text);
  font-family: var(--font-display);
}

.route-stage small {
  margin-top: 2px;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.13em;
}

.tutorial-section-grid {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: clamp(32px, 6vw, 86px);
  align-items: start;
}

.step-marker {
  position: sticky;
  top: 28px;
  min-width: 0;
  padding: 20px 17px;
  border: 1px solid var(--color-border-light);
  border-top: 3px solid var(--color-success);
  border-radius: var(--radius-small);
  background: var(--color-bg-deep);
  box-shadow: var(--shadow-panel);
}

.step-marker span,
.step-marker strong {
  display: block;
}

.step-marker span {
  margin-bottom: 9px;
  color: var(--color-success);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
}

.step-marker strong {
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: 20px;
}

.tutorial-copy {
  min-width: 0;
  max-width: 920px;
}

.tutorial-copy > p {
  font-size: 16px;
  line-height: 1.95;
}

.tutorial-copy h3 {
  margin-top: 38px;
}

.preflight-board {
  display: grid;
  margin: 32px 0;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--color-border);
  background: var(--color-border);
  box-shadow: var(--shadow-panel);
}

.preflight-board > div {
  min-width: 0;
  padding: 22px;
  background: var(--color-bg-panel);
}

.preflight-board strong {
  display: block;
  margin-bottom: 8px;
}

.preflight-board p {
  margin-bottom: 0;
  font-size: 13px;
}

.preflight-code {
  display: block;
  margin-bottom: 12px;
  color: var(--color-success);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.1em;
}

.mode-ledger {
  display: grid;
  margin: 30px 0;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--color-border);
  background: var(--color-border);
  box-shadow: var(--shadow-panel);
}

.mode-ledger article {
  min-width: 0;
  padding: 23px;
  background: linear-gradient(145deg, var(--color-bg-panel-2), var(--color-bg-panel));
}

.mode-ledger article:first-child {
  box-shadow: inset 0 3px 0 var(--color-accent);
}

.mode-ledger h3 {
  margin-top: 0;
  font-size: 20px;
}

.mode-ledger p {
  margin-bottom: 0;
  font-size: 13px;
}

.operation-result {
  display: flex;
  margin-top: 34px;
  padding: 20px 22px;
  align-items: flex-start;
  gap: 14px;
  border: 1px solid var(--color-success);
  border-radius: var(--radius-small);
  background: var(--color-bg-panel-2);
  box-shadow: inset 0 0 24px var(--color-success-glow-soft);
}

.operation-result .status-lamp {
  width: 10px;
  height: 10px;
  margin-top: 7px;
  border-radius: var(--radius-circle);
  background: var(--color-success);
  box-shadow: 0 0 12px var(--color-success-glow);
}

.operation-result strong {
  display: block;
  margin-bottom: 4px;
}

.operation-result p {
  margin-bottom: 0;
}

.verify-sequence {
  display: grid;
  margin: 34px 0;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.verify-sequence > div {
  position: relative;
  min-width: 0;
  padding: 20px;
  border: 1px solid var(--color-border);
  border-top: 3px solid var(--color-success);
  border-radius: var(--radius-small);
  background: var(--color-bg-panel);
}

.verify-sequence span {
  display: block;
  margin-bottom: 13px;
  color: var(--color-success);
  font-family: var(--font-mono);
  font-size: 11px;
}

.verify-sequence strong {
  display: block;
  margin-bottom: 7px;
}

.verify-sequence p {
  margin-bottom: 0;
  font-size: 12px;
}

.completion-panel {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: clamp(30px, 6vw, 78px);
  border-left: 4px solid var(--color-accent);
}

.completion-panel > .button-row {
  grid-column: 1 / -1;
}

.completion-list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: completion;
}

.completion-list li {
  position: relative;
  min-height: 70px;
  padding: 0 0 22px 52px;
  counter-increment: completion;
  border-left: 1px solid var(--color-border);
}

.completion-list li:last-child {
  padding-bottom: 0;
  border-left-color: var(--color-transparent);
}

.completion-list li::before {
  position: absolute;
  top: 0;
  left: -18px;
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border: 1px solid var(--color-success);
  border-radius: var(--radius-circle);
  content: counter(completion, decimal-leading-zero);
  color: var(--color-bg-deep);
  background: var(--color-success);
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 800;
}

.completion-list strong {
  display: block;
  margin-bottom: 5px;
}

.completion-list p {
  margin-bottom: 0;
}

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

  .tutorial-route {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .tutorial-route::before {
    display: none;
  }

  .tutorial-section-grid {
    grid-template-columns: 130px minmax(0, 1fr);
    gap: 34px;
  }

  .preflight-board,
  .mode-ledger {
    grid-template-columns: minmax(0, 1fr);
  }

  .verify-sequence {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .completion-panel > .button-row {
    grid-column: auto;
  }
}

@media (max-width: 640px) {
  .tutorial-hero {
    min-height: auto;
  }

  .tutorial-hero-grid {
    min-height: 0;
    gap: 38px;
  }

  .tutorial-intro h1 {
    font-size: clamp(42px, 13vw, 58px);
  }

  .tutorial-route {
    padding: 16px;
    grid-template-columns: minmax(0, 1fr);
  }

  .tutorial-section-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

  .step-marker {
    position: relative;
    top: auto;
    display: flex;
    padding: 14px 16px;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
  }

  .step-marker span {
    margin-bottom: 0;
  }

  .step-marker strong {
    font-size: 17px;
  }

  .tutorial-copy > p {
    font-size: 15px;
  }

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

  .operation-result {
    padding: 18px;
  }

  .completion-list li {
    padding-left: 44px;
  }
}