.tutorial-hero {
  padding-top: clamp(64px, 8vw, 112px);
  padding-bottom: clamp(70px, 9vw, 124px);
  overflow-x: clip;
}

.tutorial-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.44fr) minmax(0, 0.56fr);
  align-items: center;
  gap: clamp(42px, 6vw, 88px);
}

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

.tutorial-intro h1 {
  margin-bottom: 28px;
}

.tutorial-intro .button-row {
  margin-bottom: 26px;
}

.tutorial-intro .lead {
  margin-bottom: 24px;
  font-size: 17px;
}

.tutorial-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tutorial-route {
  min-height: 590px;
  padding: clamp(24px, 4vw, 42px);
  border: 1px solid var(--color-board-line-strong);
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  background:
    linear-gradient(var(--color-board-line), var(--color-board-line)) 0 25% / 100% 1px no-repeat,
    linear-gradient(var(--color-board-line), var(--color-board-line)) 0 50% / 100% 1px no-repeat,
    linear-gradient(var(--color-board-line), var(--color-board-line)) 0 75% / 100% 1px no-repeat,
    linear-gradient(135deg, var(--color-accent-black), var(--color-accent-dark));
  box-shadow: var(--shadow-window);
  color: var(--color-cold-line);
}

.tutorial-route::before {
  width: 220px;
  height: 220px;
  border: 1px solid var(--color-board-line-strong);
  border-radius: var(--radius-pill);
  position: absolute;
  right: -90px;
  top: -105px;
  content: "";
}

.tutorial-route::after {
  width: 1px;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 32%;
  background: var(--color-board-line);
  content: "";
}

.route-head {
  position: relative;
  z-index: 1;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-board-line-strong);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  color: var(--color-cold-line-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.route-list {
  margin: 30px 0;
  padding: 0;
  position: relative;
  z-index: 1;
  display: grid;
  gap: 12px;
  list-style: none;
}

.route-list::before {
  width: 1px;
  position: absolute;
  top: 38px;
  bottom: 38px;
  left: 24px;
  background: var(--color-cold-line-soft);
  content: "";
}

.route-list li {
  min-height: 82px;
  padding: 14px 16px 14px 10px;
  border: 1px solid var(--color-board-line-strong);
  border-radius: var(--radius-sm);
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr) 24px;
  align-items: center;
  gap: 14px;
  background: var(--color-board-depth);
}

.route-list li:nth-child(2),
.route-list li:nth-child(4) {
  margin-left: 30px;
}

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

.route-list strong {
  color: var(--color-white-soft);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: var(--weight-medium);
  letter-spacing: 0.02em;
}

.route-list small {
  margin-top: 5px;
  color: var(--color-cold-line-soft);
  font-size: 12px;
}

.route-list svg {
  width: 20px;
  height: 20px;
  color: var(--color-cold-line);
}

.route-number {
  width: 48px;
  height: 48px;
  border: 1px solid var(--color-board-line-strong);
  border-radius: var(--radius-pill);
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  background: var(--color-accent-deep);
  color: var(--color-cold-line);
  font-family: var(--font-mono);
  font-size: 11px;
}

.route-output {
  margin-top: auto;
  padding-top: 20px;
  border-top: 1px solid var(--color-board-line-strong);
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--color-cold-line-soft);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.04em;
}

.route-output i {
  height: 1px;
  min-width: 12px;
  flex: 1 1 auto;
  position: relative;
  overflow: hidden;
  background: var(--color-board-line-strong);
}

.route-output i::after {
  width: 45%;
  height: 1px;
  position: absolute;
  inset: 0 auto 0 -45%;
  background: var(--color-cold-line);
  content: "";
  animation: tutorial-route-flow 3.2s linear infinite;
}

.platform-heading {
  margin-bottom: 30px;
}

.tutorial-tabs .tab-panel {
  padding-top: 16px;
}

.platform-note {
  padding: 22px 24px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  display: grid;
  grid-template-columns: minmax(150px, 0.25fr) minmax(0, 1fr) auto;
  align-items: center;
  gap: 24px;
  background: var(--color-panel);
}

.platform-note strong {
  color: var(--color-text);
  font-weight: var(--weight-medium);
}

.platform-note p {
  margin: 0;
  color: var(--color-muted);
  font-size: 14px;
}

.platform-note a {
  color: var(--color-accent-dark);
  font-size: 13px;
  font-weight: var(--weight-medium);
  white-space: nowrap;
}

.tutorial-layout {
  display: grid;
  grid-template-columns: minmax(210px, 0.27fr) minmax(0, 1fr);
  align-items: start;
  gap: clamp(38px, 7vw, 92px);
}

.tutorial-sidebar {
  position: sticky;
  top: calc(var(--header-height) + 22px);
}

.sidebar-label {
  margin-bottom: 14px;
  color: var(--color-muted-light);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.09em;
}

.tutorial-sidebar .toc {
  position: static;
  padding: 6px;
  display: grid;
  gap: 2px;
  box-shadow: none;
}

.tutorial-sidebar .toc a {
  width: 100%;
}

.sidebar-progress {
  margin-top: 22px;
  display: flex;
  align-items: center;
  gap: 7px;
  color: var(--color-muted-light);
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.04em;
}

.sidebar-progress i {
  height: 1px;
  flex: 1 1 auto;
  background: var(--color-border);
}

.tutorial-content {
  max-width: 900px;
}

.guide-section {
  padding-bottom: 82px;
  border-bottom: 1px solid var(--color-border);
}

.guide-section + .guide-section {
  padding-top: 82px;
}

.guide-section h2 {
  max-width: 780px;
}

.guide-section h3 {
  letter-spacing: -0.02em;
}

.step-label {
  margin-bottom: 15px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.09em;
}

.check-strip {
  margin-top: 32px;
  padding: 18px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  background: var(--color-panel-soft);
}

.check-strip strong {
  margin-right: 4px;
  color: var(--color-text);
  font-size: 13px;
}

.check-strip span {
  min-height: 28px;
  padding: 0 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  display: inline-flex;
  align-items: center;
  background: var(--color-panel);
  color: var(--color-muted);
  font-size: 11px;
}

.check-strip span::before {
  width: 5px;
  height: 5px;
  margin-right: 7px;
  border-radius: var(--radius-pill);
  flex-shrink: 0;
  background: var(--color-success);
  content: "";
}

.setting-comparison {
  margin-top: 34px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  overflow: hidden;
  background: var(--color-panel);
}

.setting-comparison > div {
  padding: 26px;
}

.setting-comparison > div + div {
  border-left: 1px solid var(--color-border);
  background: var(--color-panel-soft);
}

.setting-comparison span {
  color: var(--color-accent);
  font-size: 10px;
  letter-spacing: 0.06em;
}

.setting-comparison h3 {
  margin: 12px 0 9px;
  font-size: 19px;
}

.setting-comparison p {
  margin: 0;
  font-size: 13px;
}

.verification-grid {
  margin-top: 36px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-border);
}

.verification-grid > div {
  padding: 24px;
  background: var(--color-panel);
}

.verification-grid span {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 11px;
}

.verification-grid strong {
  margin: 9px 0 6px;
  display: block;
  color: var(--color-text);
  font-weight: var(--weight-medium);
}

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

.next-reading {
  padding-top: 82px;
}

.next-reading-grid {
  display: grid;
  gap: 10px;
}

.next-reading-grid a {
  padding: 22px 24px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  display: grid;
  grid-template-columns: minmax(90px, 0.2fr) minmax(190px, 0.42fr) minmax(0, 1fr);
  align-items: center;
  gap: 20px;
  background: var(--color-panel);
  text-decoration: none;
  transition: border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.next-reading-grid a:hover {
  border-color: var(--color-cold-line-soft);
  color: var(--color-text);
  box-shadow: var(--shadow-card);
  transform: translateX(3px);
}

.next-reading-grid span {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
}

.next-reading-grid strong {
  color: var(--color-text);
  font-size: 15px;
  font-weight: var(--weight-medium);
}

.next-reading-grid small {
  color: var(--color-muted);
  font-size: 12px;
}

@keyframes tutorial-route-flow {
  from {
    transform: translateX(0);
  }

  to {
    transform: translateX(320%);
  }
}

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

  .tutorial-intro {
    max-width: 760px;
  }

  .tutorial-route {
    min-height: 520px;
  }

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

  .tutorial-sidebar {
    position: static;
  }

  .tutorial-sidebar .toc {
    display: flex;
  }

  .sidebar-progress {
    display: none;
  }
}

@media (max-width: 760px) {
  .platform-note {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .platform-note a {
    white-space: normal;
  }

  .next-reading-grid a {
    grid-template-columns: 1fr;
    gap: 7px;
  }
}

@media (max-width: 640px) {
  .tutorial-hero {
    padding-top: 52px;
    padding-bottom: 72px;
  }

  .tutorial-hero-grid {
    gap: 42px;
  }

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

  .tutorial-route {
    min-height: 480px;
    padding: 20px;
  }

  .tutorial-route::after {
    left: 28%;
  }

  .route-list li {
    min-height: 76px;
    grid-template-columns: 42px minmax(0, 1fr) 20px;
    gap: 10px;
  }

  .route-list li:nth-child(2),
  .route-list li:nth-child(4) {
    margin-left: 12px;
  }

  .route-number {
    width: 42px;
    height: 42px;
  }

  .route-list strong {
    font-size: 12px;
  }

  .route-list small {
    font-size: 10px;
  }

  .route-output {
    gap: 5px;
    font-size: 7px;
  }

  .platform-note {
    padding: 19px;
  }

  .guide-section {
    padding-bottom: 62px;
  }

  .guide-section + .guide-section {
    padding-top: 62px;
  }

  .setting-comparison {
    grid-template-columns: 1fr;
  }

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

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

  .check-strip {
    align-items: stretch;
    flex-direction: column;
  }

  .check-strip span {
    width: 100%;
  }

  .next-reading {
    padding-top: 62px;
  }
}

@media (max-width: 380px) {
  .tutorial-route {
    padding: 16px;
  }

  .route-list li {
    padding-right: 10px;
  }

  .route-list svg {
    display: none;
  }

  .route-list li {
    grid-template-columns: 42px minmax(0, 1fr);
  }

  .route-output i {
    min-width: 5px;
  }
}