.stream-hero {
  position: relative;
  overflow-x: clip;
  border-bottom: 1px solid var(--color-border-soft);
  background:
    radial-gradient(circle at 72% 38%, var(--color-glow-blue), transparent 28rem),
    linear-gradient(180deg, var(--color-canvas), var(--color-canvas-deep));
}

.stream-hero::before {
  position: absolute;
  inset: 0;
  content: "";
  pointer-events: none;
  background-image:
    linear-gradient(var(--color-border-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-border-soft) 1px, transparent 1px);
  background-size: 54px 54px;
  opacity: 0.16;
  mask-image: linear-gradient(90deg, transparent, var(--color-white), transparent);
}

.stream-hero-layout {
  position: relative;
  display: grid;
  grid-template-columns: minmax(390px, 0.86fr) minmax(0, 1.14fr);
  gap: 58px;
  align-items: center;
  min-height: 720px;
  padding-top: 72px;
  padding-bottom: 78px;
}

.stream-hero-copy {
  position: relative;
  z-index: 2;
  max-width: 570px;
}

.stream-hero-copy h1 {
  max-width: 620px;
}

.stream-hero-copy .button-row {
  margin-top: 28px;
}

.stream-hero-lead {
  margin-top: 26px;
  font-size: 18px;
  line-height: 1.78;
}

.stream-fact-line {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 24px;
}

.stream-fact-line span {
  display: inline-flex;
  align-items: center;
  min-height: 31px;
  padding: 5px 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xs);
  color: var(--color-text-muted);
  background: var(--color-panel-translucent);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
}

.stream-fact-line span::before {
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  margin-right: 7px;
  border-radius: var(--radius-pill);
  content: "";
  background: var(--color-success);
  box-shadow: 0 0 10px var(--color-success);
}

.catalog-window {
  position: relative;
  z-index: 1;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-panel);
  box-shadow: var(--shadow-window);
}

.catalog-window::after {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  content: "";
  box-shadow: inset 0 1px 0 var(--color-border-soft);
}

.catalog-chrome {
  display: flex;
  align-items: center;
  min-height: 54px;
  padding: 0 18px;
  border-bottom: 1px solid var(--color-border-soft);
  background: linear-gradient(90deg, var(--color-panel), var(--color-panel-raised));
}

.catalog-title {
  color: var(--color-text);
  font-size: 13px;
  font-weight: 780;
}

.catalog-state {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-left: auto;
  color: var(--color-success);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 750;
}

.catalog-state::before {
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  border-radius: var(--radius-pill);
  content: "";
  background: var(--color-success);
  box-shadow: 0 0 11px var(--color-success);
}

.catalog-body {
  display: grid;
  gap: 7px;
  padding: 13px;
}

.catalog-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 13px;
  align-items: center;
  min-height: 92px;
  padding: 14px;
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-sm);
  background: var(--color-panel-subtle);
}

.catalog-step.is-active {
  border-color: var(--color-accent-bright);
  background: linear-gradient(90deg, var(--color-panel-selected), var(--color-panel-raised));
  box-shadow:
    inset 3px 0 0 var(--color-success),
    0 10px 24px var(--color-shadow-soft);
}

.catalog-index {
  display: grid;
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xs);
  color: var(--color-success);
  background: var(--color-panel);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
}

.catalog-step strong {
  display: block;
  margin-bottom: 3px;
  font-size: 14px;
}

.catalog-step p {
  margin: 0;
  font-size: 12px;
  line-height: 1.55;
}

.catalog-footer {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 50px;
  padding: 11px 18px;
  border-top: 1px solid var(--color-border-soft);
  color: var(--color-text-muted);
  background: var(--color-panel-subtle);
  font-size: 11px;
}

.catalog-footer svg {
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  color: var(--color-success);
}

.stream-document {
  position: relative;
}

.stream-section {
  border-top: 1px solid var(--color-border-soft);
}

.stream-section-alt {
  background: var(--color-panel-subtle);
}

.stream-reading-grid {
  display: grid;
  grid-template-columns: minmax(180px, 0.34fr) minmax(0, 1fr);
  gap: 64px;
  align-items: start;
}

.stream-section-label {
  position: sticky;
  top: var(--toc-offset);
  display: grid;
  gap: 8px;
  padding: 16px 0 16px 18px;
  border-left: 3px solid var(--color-success);
}

.stream-section-label span {
  color: var(--color-success);
  font-size: 10px;
  font-weight: 750;
  letter-spacing: 0.08em;
}

.stream-section-label strong {
  font-size: 15px;
}

.stream-prose {
  max-width: var(--reading-width);
  color: var(--color-text-muted);
}

.stream-prose h2 {
  margin-bottom: 24px;
}

.stream-prose h3 {
  font-size: 21px;
}

.stream-prose p {
  line-height: 1.86;
}

.stream-prose .callout {
  margin-top: 32px;
  margin-bottom: 32px;
}

.support-check {
  display: inline-flex;
  max-width: 100%;
  padding: 4px 8px;
  overflow: hidden;
  border: 1px solid var(--color-warn);
  border-radius: var(--radius-xs);
  color: var(--color-warn);
  background: var(--color-panel-raised);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 750;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.table-note {
  max-width: 900px;
  margin: 18px 0 0;
  color: var(--color-text-faint);
  font-size: 13px;
}

.ip-compare {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 32px 0;
}

.ip-compare article {
  min-width: 0;
  padding: 24px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  box-shadow: var(--shadow-card);
}

.ip-compare h3 {
  margin-top: 18px;
}

.ip-compare p {
  margin-bottom: 0;
  font-size: 14px;
}

.quality-chain {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  margin: 32px 0;
}

.quality-chain div {
  min-width: 0;
  padding: 18px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-panel);
}

.quality-chain span {
  display: block;
  margin-bottom: 8px;
  color: var(--color-success);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 750;
}

.quality-chain strong {
  display: block;
  font-size: 13px;
  line-height: 1.55;
}

.error-board {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-panel);
  box-shadow: var(--shadow-card);
}

.error-card {
  min-width: 0;
  padding: 28px;
  border-bottom: 1px solid var(--color-border-soft);
}

.error-card:nth-child(odd) {
  border-right: 1px solid var(--color-border-soft);
}

.error-card:nth-last-child(-n + 2) {
  border-bottom: 0;
}

.error-card-head {
  display: flex;
  align-items: center;
  gap: 11px;
  margin-bottom: 14px;
}

.error-card h3 {
  margin: 0;
  font-size: 20px;
}

.error-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
}

.error-dot {
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  border-radius: var(--radius-pill);
  background: var(--color-warn);
  box-shadow: 0 0 12px var(--color-warn);
}

.stream-prose .steps {
  display: grid;
  gap: 30px;
}

.stream-prose .steps > li {
  padding-bottom: 26px;
  border-bottom: 1px solid var(--color-border-soft);
}

.stream-prose .steps > li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.stream-prose .steps h3 {
  margin-bottom: 9px;
}

.stream-prose .steps p {
  margin-bottom: 0;
}

.stream-next {
  border-top: 1px solid var(--color-border);
  background:
    radial-gradient(circle at 82% 50%, var(--color-glow-green), transparent 23rem),
    var(--color-panel);
}

.stream-next-heading {
  max-width: 760px;
  margin-bottom: 34px;
}

.stream-next-heading p {
  margin-bottom: 0;
}

.stream-next-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.stream-next-card {
  display: flex;
  min-width: 0;
  min-height: 210px;
  padding: 28px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: linear-gradient(145deg, var(--color-panel-raised), var(--color-panel));
  box-shadow: var(--shadow-card);
  flex-direction: column;
  transition:
    transform var(--transition-fast),
    border-color var(--transition-fast);
}

.stream-next-card:hover {
  border-color: var(--color-accent-bright);
  transform: translateY(-3px);
}

.stream-next-card > .mono {
  margin-bottom: 14px;
  color: var(--color-success);
  font-size: 10px;
  font-weight: 750;
  letter-spacing: 0.08em;
}

.stream-next-card > strong {
  margin-bottom: 8px;
  font-size: 24px;
}

.stream-next-card p {
  font-size: 14px;
}

.stream-next-link {
  margin-top: auto;
  color: var(--color-success);
  font-size: 13px;
  font-weight: 750;
}

@media (max-width: 1080px) {
  .stream-hero-layout {
    grid-template-columns: minmax(340px, 0.8fr) minmax(0, 1.2fr);
    gap: 34px;
  }

  .stream-reading-grid {
    grid-template-columns: minmax(150px, 0.28fr) minmax(0, 1fr);
    gap: 40px;
  }

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

@media (max-width: 900px) {
  .stream-hero-layout {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: 58px;
  }

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

  .catalog-window {
    max-width: 720px;
  }

  .stream-reading-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .stream-section-label {
    position: static;
    max-width: 360px;
  }
}

@media (max-width: 768px) {
  .stream-hero-layout {
    padding-top: 44px;
    padding-bottom: 62px;
  }

  .stream-hero-lead {
    font-size: 16px;
  }

  .ip-compare,
  .error-board,
  .stream-next-grid {
    grid-template-columns: 1fr;
  }

  .error-card,
  .error-card:nth-child(odd),
  .error-card:nth-last-child(-n + 2) {
    border-right: 0;
    border-bottom: 1px solid var(--color-border-soft);
  }

  .error-card:last-child {
    border-bottom: 0;
  }
}

@media (max-width: 640px) {
  .catalog-chrome {
    padding-inline: 12px;
  }

  .catalog-title {
    font-size: 12px;
  }

  .catalog-step {
    grid-template-columns: auto minmax(0, 1fr);
    min-height: 102px;
    padding: 12px;
  }

  .catalog-step .route-label {
    display: none;
  }

  .catalog-step p {
    font-size: 11px;
  }

  .catalog-footer {
    align-items: flex-start;
    padding-top: 12px;
    padding-bottom: 12px;
  }

  .stream-fact-line span {
    max-width: 100%;
  }

  .ip-compare article,
  .error-card,
  .stream-next-card {
    padding: 21px;
  }

  .quality-chain {
    grid-template-columns: 1fr;
  }

  .stream-prose .steps > li {
    padding-left: 48px;
  }

  .support-check {
    max-width: 180px;
  }
}