:root {
  --tutorial-rail-width: 116px;
  --tutorial-copy-width: 860px;
  --tutorial-window-width: 470px;
  --tutorial-line: 2px;
}

.tutorial-main {
  position: relative;
  overflow-x: clip;
}

.tutorial-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-top: clamp(64px, 8vw, 112px);
  padding-bottom: clamp(72px, 9vw, 128px);
  background:
    radial-gradient(circle at 84% 18%, var(--color-sun), var(--color-transparent) 24%),
    radial-gradient(ellipse at 68% 80%, var(--color-apricot), var(--color-transparent) 38%),
    linear-gradient(145deg, var(--color-bg), var(--color-panel), var(--color-panel-muted));
}

.tutorial-hero::before {
  position: absolute;
  inset: 0;
  z-index: -1;
  content: "";
  background:
    repeating-linear-gradient(90deg, var(--color-transparent) 0, var(--color-transparent) 79px, var(--color-text-soft) 80px),
    repeating-linear-gradient(0deg, var(--color-transparent) 0, var(--color-transparent) 79px, var(--color-text-soft) 80px);
  opacity: 0.18;
  mask-image: linear-gradient(to bottom, var(--color-transparent), var(--color-text), var(--color-transparent));
}

.tutorial-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(390px, var(--tutorial-window-width));
  align-items: center;
  gap: clamp(40px, 7vw, 96px);
}

.tutorial-hero-copy {
  max-width: 700px;
}

.tutorial-hero-copy .eyebrow {
  margin-bottom: 22px;
}

.tutorial-hero-copy h1 {
  max-width: 670px;
}

.tutorial-lead {
  max-width: 650px;
  margin-bottom: 28px;
  color: var(--color-muted);
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.8;
}

.guide-window {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--color-glass-strong);
  border-radius: var(--radius-xl);
  background: var(--color-glass);
  box-shadow: var(--shadow-window), var(--shadow-window-edge);
  backdrop-filter: blur(24px) saturate(116%);
  transform: rotate(1deg);
}

.guide-window::after {
  position: absolute;
  right: 12%;
  bottom: -28px;
  left: 12%;
  z-index: -1;
  height: 52px;
  border-radius: 50%;
  content: "";
  background: var(--color-text-shadow);
  filter: blur(22px);
}

.guide-window-bar {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  min-height: 58px;
  align-items: center;
  gap: 12px;
  padding-inline: 18px;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-glass-soft);
}

.guide-window-bar .badge {
  justify-self: end;
}

.guide-window-controls {
  display: flex;
  gap: 7px;
}

.guide-control {
  width: 10px;
  height: 10px;
  flex: 0 0 auto;
  border-radius: 50%;
  box-shadow: inset 0 0 0 1px var(--color-text-soft);
}

.guide-control-error {
  background: var(--color-error);
}

.guide-control-warn {
  background: var(--color-warn);
}

.guide-control-success {
  background: var(--color-success);
}

.guide-window-title {
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  white-space: nowrap;
}

.guide-window-body {
  padding: clamp(24px, 4vw, 38px);
}

.guide-window-heading {
  margin-bottom: 24px;
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.guide-route {
  position: relative;
  display: grid;
  gap: 24px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.guide-route::before {
  position: absolute;
  top: 18px;
  bottom: 18px;
  left: 17px;
  border-left: var(--tutorial-line) dashed var(--color-accent-medium);
  content: "";
}

.guide-route li {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  align-items: center;
  gap: 14px;
}

.guide-route-dot {
  display: block;
  width: 34px;
  height: 34px;
  border: 9px solid var(--color-panel);
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 0 1px var(--color-accent-medium);
}

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

.guide-route strong {
  margin-bottom: 3px;
  font-size: 15px;
}

.guide-route small {
  line-height: 1.55;
}

.guide-window-foot {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 30px;
  padding-top: 18px;
  border-top: 1px solid var(--color-border);
}

.guide-window-foot span {
  padding: 6px 9px;
  border-radius: var(--radius-pill);
  color: var(--color-muted);
  background: var(--color-panel-muted);
  font-family: var(--font-mono);
  font-size: 10px;
}

.tutorial-content {
  position: relative;
  padding-top: clamp(40px, 6vw, 72px);
  padding-bottom: var(--section-space);
}

.tutorial-article {
  width: 100%;
  max-width: calc(var(--tutorial-rail-width) + var(--tutorial-copy-width) + 42px);
  margin-inline: auto;
}

.tutorial-step {
  position: relative;
  display: grid;
  grid-template-columns: var(--tutorial-rail-width) minmax(0, var(--tutorial-copy-width));
  gap: 42px;
  padding-top: clamp(48px, 7vw, 84px);
  padding-bottom: clamp(48px, 7vw, 84px);
  border-bottom: 1px solid var(--color-border);
}

.tutorial-step:last-child {
  border-bottom: 0;
}

.tutorial-step::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: calc((var(--tutorial-rail-width) / 2) - (var(--tutorial-line) / 2));
  width: var(--tutorial-line);
  content: "";
  background: linear-gradient(var(--color-accent-medium), var(--color-border));
}

.step-marker {
  position: sticky;
  top: var(--toc-offset);
  z-index: 2;
  display: grid;
  width: 76px;
  min-height: 42px;
  align-self: start;
  justify-self: center;
  place-items: center;
  border: 1px solid var(--color-accent-medium);
  border-radius: var(--radius-pill);
  color: var(--color-accent-dark);
  background: var(--color-panel);
  box-shadow: var(--shadow-card);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.step-content {
  min-width: 0;
  font-size: 17px;
  line-height: 1.86;
}

.step-content h2 {
  margin-bottom: 26px;
}

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

.step-content p strong,
.step-content li strong {
  color: var(--color-text);
}

.step-content a:not(.button) {
  color: var(--color-accent-dark);
  text-decoration: underline;
  text-decoration-color: var(--color-accent-medium);
  text-underline-offset: 0.2em;
}

.step-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 20px;
  margin-top: 28px;
}

.text-link {
  font-size: 14px;
  font-weight: 720;
}

.platform-instructions {
  display: grid;
  gap: 18px;
  margin-top: 34px;
}

.platform-instruction {
  padding: clamp(22px, 4vw, 32px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background:
    radial-gradient(circle at 96% 4%, var(--color-accent-soft), var(--color-transparent) 28%),
    var(--color-panel);
  box-shadow: var(--shadow-card);
}

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

.platform-heading {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}

.platform-heading h3 {
  margin-bottom: 0;
  font-size: clamp(20px, 2.4vw, 25px);
}

.platform-symbol {
  display: grid;
  width: 46px;
  height: 46px;
  flex: 0 0 auto;
  place-items: center;
  border-radius: var(--radius-md);
  color: var(--color-accent-dark);
  background: var(--color-accent-soft);
}

.platform-symbol svg {
  width: 24px;
  height: 24px;
  stroke-width: 1.7;
}

.verification-panel {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 30px;
  padding: 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-panel-muted);
}

.verification-panel div {
  min-width: 0;
  padding: 18px;
  border-radius: var(--radius-lg);
  background: var(--color-panel);
}

.verification-panel strong,
.verification-panel span {
  display: block;
}

.verification-panel strong {
  position: relative;
  margin-bottom: 7px;
  padding-left: 18px;
  font-size: 14px;
}

.verification-panel strong::before {
  position: absolute;
  top: 0.55em;
  left: 0;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  content: "";
  background: var(--color-success);
  box-shadow: 0 0 0 4px var(--color-success-soft);
}

.verification-panel span {
  color: var(--color-muted);
  font-size: 12px;
  line-height: 1.6;
}

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

  .tutorial-hero-copy {
    max-width: 720px;
  }

  .guide-window {
    width: 100%;
    max-width: 650px;
    transform: none;
  }
}

@media (max-width: 760px) {
  :root {
    --tutorial-rail-width: 72px;
  }

  .tutorial-step {
    gap: 20px;
  }

  .step-marker {
    width: 60px;
  }

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

@media (max-width: 640px) {
  .tutorial-hero {
    padding-top: 48px;
    padding-bottom: 72px;
  }

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

  .guide-window-title {
    display: none;
  }

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

  .tutorial-step {
    display: block;
    padding-top: 48px;
    padding-bottom: 48px;
  }

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

  .step-marker {
    position: static;
    width: fit-content;
    min-width: 62px;
    margin-bottom: 20px;
    padding-inline: 14px;
  }

  .step-content {
    font-size: 16px;
    line-height: 1.8;
  }

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

  .step-actions .button {
    width: 100%;
  }

  .text-link {
    text-align: center;
  }

  .platform-heading {
    align-items: flex-start;
  }

  .platform-symbol {
    width: 42px;
    height: 42px;
  }
}

@media (max-width: 380px) {
  .guide-window-body {
    padding: 20px;
  }

  .guide-window-bar {
    padding-inline: 14px;
  }

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