.tutorial-hero {
  position: relative;
  min-height: 680px;
  padding-top: calc(var(--header-height) + 86px);
  padding-bottom: 82px;
  overflow: hidden;
  isolation: isolate;
  border-bottom: 1px solid var(--color-accent-14);
  background:
    linear-gradient(118deg, var(--color-bg-heavy), var(--color-transparent) 58%),
    radial-gradient(circle at 82% 62%, var(--color-accent-18), var(--color-transparent) 26%),
    var(--color-bg);
}

.tutorial-hero::before {
  position: absolute;
  z-index: -2;
  inset: 0;
  content: "";
  background:
    repeating-linear-gradient(
      0deg,
      var(--color-transparent) 0,
      var(--color-transparent) 45px,
      var(--color-accent-05) 46px
    ),
    repeating-linear-gradient(
      90deg,
      var(--color-transparent) 0,
      var(--color-transparent) 82px,
      var(--color-accent-05) 83px
    );
  transform: perspective(620px) rotateX(62deg) scale(1.45) translateY(25%);
  transform-origin: center bottom;
}

.tutorial-hero::after {
  position: absolute;
  z-index: -1;
  right: -12%;
  bottom: -46%;
  width: 70%;
  aspect-ratio: 1;
  content: "";
  border: 1px solid var(--color-accent-18);
  border-radius: var(--radius-pill);
  box-shadow:
    0 0 0 46px var(--color-accent-03),
    0 0 0 94px var(--color-accent-03),
    var(--shadow-glow);
}

.tutorial-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.18fr) minmax(330px, 0.82fr);
  align-items: center;
  gap: clamp(46px, 8vw, 110px);
}

.tutorial-hero-copy {
  max-width: 760px;
}

.tutorial-hero h1 {
  font-size: clamp(48px, 5.4vw, 72px);
}

.tutorial-lead {
  max-width: 700px;
  margin-bottom: 28px;
  color: var(--color-text-muted);
  font-size: 17px;
}

.tutorial-facts {
  margin-top: 24px;
}

.tutorial-route {
  position: relative;
  min-width: 0;
  padding: 24px;
  border-top: 1px solid var(--color-accent-48);
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  background:
    linear-gradient(145deg, var(--color-accent-08), var(--color-transparent) 48%),
    var(--color-panel-deep);
  box-shadow: var(--shadow-panel);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 20px 100%, 0 calc(100% - 20px));
}

.tutorial-route-label {
  margin-bottom: 18px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.15em;
}

.tutorial-route-list {
  position: relative;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  list-style: none;
}

.tutorial-route-list::before {
  position: absolute;
  top: 23px;
  bottom: 23px;
  left: 21px;
  width: 1px;
  content: "";
  background: var(--color-accent-36);
  box-shadow: 0 0 14px var(--color-accent-24);
}

.tutorial-route-list li {
  position: relative;
  min-width: 0;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 2px 14px;
  padding: 15px 0;
  border-bottom: 1px solid var(--color-accent-10);
}

.tutorial-route-list li:last-child {
  border-bottom: 0;
}

.tutorial-route-list li > span {
  z-index: 1;
  width: 44px;
  height: 44px;
  grid-row: 1 / 3;
  display: grid;
  place-items: center;
  border: 1px solid var(--color-accent-48);
  background: var(--color-bg-panel);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 11px;
  box-shadow: var(--shadow-glow);
}

.tutorial-route-list strong {
  align-self: end;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.tutorial-route-list small {
  align-self: start;
  font-size: 11px;
}

.tutorial-toc-wrap {
  position: relative;
  z-index: 5;
  margin-top: -24px;
}

.tutorial-toc-wrap .toc {
  box-shadow: var(--shadow-panel);
}

.tutorial-intro {
  padding-top: 88px;
}

.setup-checkline {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 34px;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-accent-03);
}

.setup-checkline span {
  min-width: 0;
  padding: 15px;
  border-right: 1px solid var(--color-accent-14);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  text-align: center;
}

.setup-checkline span:last-child {
  border-right: 0;
}

.setup-checkline span::before {
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 8px;
  content: "";
  border-radius: var(--radius-pill);
  background: var(--color-success);
  box-shadow: 0 0 10px var(--color-accent-72);
}

.tutorial-step {
  border-top: 1px solid var(--color-accent-10);
  background:
    linear-gradient(90deg, var(--color-accent-03), var(--color-transparent) 32%),
    var(--color-bg);
}

.tutorial-step:nth-of-type(even) {
  background:
    linear-gradient(270deg, var(--color-accent-03), var(--color-transparent) 32%),
    var(--color-bg);
}

.tutorial-step-layout {
  display: grid;
  grid-template-columns: minmax(140px, 0.28fr) minmax(0, 820px);
  justify-content: center;
  gap: clamp(34px, 7vw, 92px);
}

.step-rail {
  position: relative;
  min-height: 320px;
  display: flex;
  align-items: center;
  flex-direction: column;
  gap: 16px;
  padding-top: 8px;
}

.step-rail::after {
  width: 1px;
  min-height: 210px;
  flex: 1;
  content: "";
  background: linear-gradient(var(--color-accent-48), var(--color-accent-05));
  box-shadow: 0 0 14px var(--color-accent-24);
}

.step-number {
  color: var(--color-accent);
  font-family: var(--font-display);
  font-size: clamp(58px, 7vw, 92px);
  font-weight: 900;
  line-height: 1;
  text-shadow: 0 0 28px var(--color-accent-24);
}

.step-code {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  writing-mode: vertical-rl;
}

.step-content {
  width: 100%;
}

.step-content > h2 {
  margin-bottom: 30px;
}

.step-content h3 {
  margin-top: 1.8em;
}

.step-next {
  margin-top: 42px;
  padding: 22px 24px;
  border-top: 1px solid var(--color-accent-36);
  border-bottom: 1px solid var(--color-border);
  background:
    linear-gradient(90deg, var(--color-accent-08), var(--color-transparent)),
    var(--color-bg-panel);
}

.step-next > span {
  color: var(--color-accent);
  font-size: 10px;
  letter-spacing: 0.12em;
}

.step-next p {
  margin-top: 8px;
  margin-bottom: 8px;
}

.step-next a {
  color: var(--color-warn);
  font-weight: 800;
  text-decoration-color: var(--color-warn-35);
}

.mode-slices {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 32px 0;
  border-top: 1px solid var(--color-accent-36);
  border-bottom: 1px solid var(--color-border);
}

.mode-slices section {
  min-width: 0;
  padding: 24px;
  border-right: 1px solid var(--color-border);
  background: var(--color-accent-03);
}

.mode-slices section:last-child {
  border-right: 0;
}

.mode-slices span {
  color: var(--color-accent);
  font-size: 10px;
  letter-spacing: 0.1em;
}

.mode-slices h3 {
  margin-top: 9px;
  margin-bottom: 10px;
}

.mode-slices p {
  margin-bottom: 0;
}

.verification-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 34px 0;
  border-top: 1px solid var(--color-accent-36);
  border-bottom: 1px solid var(--color-border);
}

.verification-grid section {
  min-width: 0;
  padding: 21px;
  border-right: 1px solid var(--color-border);
  background: var(--color-accent-03);
}

.verification-grid section:last-child {
  border-right: 0;
}

.verification-grid span {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.13em;
}

.verification-grid strong {
  display: block;
  margin-top: 8px;
  font-size: 14px;
}

.verification-grid p {
  margin-top: 8px;
  margin-bottom: 0;
  font-size: 13px;
}

.tutorial-troubleshooting {
  border-top: 1px solid var(--color-accent-18);
  background:
    radial-gradient(circle at 18% 20%, var(--color-accent-08), var(--color-transparent) 28%),
    var(--color-bg-panel);
}

.diagnosis-flow {
  margin: 34px 0;
  display: grid;
  border-top: 1px solid var(--color-border);
}

.diagnosis-flow article {
  min-width: 0;
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 18px;
  padding: 22px 0;
  border-bottom: 1px solid var(--color-border);
}

.diagnosis-index {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border: 1px solid var(--color-accent-36);
  background: var(--color-accent-08);
  color: var(--color-accent);
  font-family: var(--font-mono);
}

.diagnosis-flow h3 {
  margin-top: 0;
  margin-bottom: 7px;
  font-size: 20px;
}

.diagnosis-flow p {
  margin-bottom: 0;
}

.tutorial-end-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 38px;
}

@media (max-width: 900px) {
  .tutorial-hero {
    min-height: auto;
    padding-top: calc(var(--header-height) + 64px);
  }

  .tutorial-hero-grid {
    grid-template-columns: 1fr;
  }

  .tutorial-route {
    max-width: 620px;
  }

  .tutorial-step-layout {
    grid-template-columns: 82px minmax(0, 1fr);
    gap: 28px;
  }

  .step-number {
    font-size: 54px;
  }

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

  .verification-grid section {
    border-right: 0;
    border-bottom: 1px solid var(--color-border);
  }

  .verification-grid section:last-child {
    border-bottom: 0;
  }
}

@media (max-width: 640px) {
  .tutorial-hero {
    padding-top: calc(var(--header-height) + 48px);
    padding-bottom: 66px;
  }

  .tutorial-hero h1 {
    font-size: clamp(34px, 10.5vw, 44px);
  }

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

  .tutorial-route {
    padding: 18px;
  }

  .tutorial-toc-wrap {
    margin-top: -18px;
  }

  .setup-checkline {
    grid-template-columns: 1fr;
  }

  .setup-checkline span {
    border-right: 0;
    border-bottom: 1px solid var(--color-accent-14);
    text-align: left;
  }

  .setup-checkline span:last-child {
    border-bottom: 0;
  }

  .tutorial-step-layout {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .step-rail {
    min-height: 0;
    align-items: center;
    flex-direction: row;
    padding-top: 0;
  }

  .step-rail::after {
    width: auto;
    min-height: 1px;
    height: 1px;
  }

  .step-number {
    font-size: 48px;
  }

  .step-code {
    writing-mode: horizontal-tb;
  }

  .mode-slices {
    grid-template-columns: 1fr;
  }

  .mode-slices section {
    border-right: 0;
    border-bottom: 1px solid var(--color-border);
  }

  .mode-slices section:last-child {
    border-bottom: 0;
  }

  .step-next {
    padding: 19px;
  }

  .tutorial-end-actions {
    align-items: stretch;
  }

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