.stream-hero {
  display: flex;
  min-height: calc(100vh - var(--header-height));
  align-items: center;
}

.stream-hero-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(440px, 1.08fr);
  gap: 56px;
  align-items: center;
}

.stream-hero-grid {
  position: absolute;
  top: 12%;
  right: -8%;
  width: 34%;
  height: 72%;
  pointer-events: none;
  border: 1px solid var(--color-border);
  opacity: 0.34;
  transform: skewY(-7deg);
}

.stream-selector {
  position: relative;
  z-index: 2;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
}

.stream-selector-chrome {
  display: flex;
  min-height: 44px;
  align-items: center;
  gap: 7px;
  padding-inline: 17px;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface-soft);
}

.stream-selector-dot {
  width: 9px;
  height: 9px;
  flex-shrink: 0;
  border-radius: var(--radius-pill);
  background: var(--color-ink-muted);
}

.stream-selector-dot:nth-child(2) {
  opacity: 0.55;
}

.stream-selector-dot:nth-child(3) {
  opacity: 0.3;
}

.stream-selector-title {
  margin-left: auto;
  color: var(--color-ink-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.stream-selector-body {
  display: grid;
  grid-template-columns: auto minmax(120px, 1fr) auto;
  gap: 18px;
  align-items: center;
  min-height: 210px;
  padding: 34px 28px;
  background-image:
    linear-gradient(var(--color-paper-noise) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-paper-noise) 1px, transparent 1px);
  background-size: 28px 28px;
}

.stream-source,
.stream-target {
  display: grid;
  justify-items: center;
  gap: 9px;
  color: var(--color-ink-muted);
  font-size: 12px;
  text-align: center;
}

.stream-device-icon,
.stream-target-icon {
  display: inline-flex;
  width: 56px;
  height: 56px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  color: var(--color-accent-deep);
}

.stream-paths {
  display: grid;
  gap: 23px;
}

.stream-path {
  position: relative;
  display: block;
  width: 100%;
  height: 0;
}

.stream-path::before,
.stream-path::after {
  position: absolute;
  top: 50%;
  width: 9px;
  height: 9px;
  border-radius: var(--radius-pill);
  background: inherit;
  content: "";
  transform: translateY(-50%);
}

.stream-path::before {
  left: 22%;
}

.stream-path::after {
  right: 22%;
}

.stream-path-muted {
  border-top: 2px dashed var(--color-route-muted);
  background: var(--color-route-muted);
}

.stream-path-selected {
  border-top: 5px solid var(--color-accent);
  background: var(--color-accent);
  box-shadow: 0 5px 14px var(--color-button-shadow);
  transform: skewY(-7deg);
}

.stream-platform-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 17px 20px;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.stream-platform-list span {
  display: inline-flex;
  max-width: 100%;
  min-height: 28px;
  align-items: center;
  padding: 4px 10px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-surface-soft);
  color: var(--color-ink-muted);
  font-size: 12px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.stream-selector-note {
  padding: 16px 20px;
  color: var(--color-ink-muted);
  font-size: 12px;
}

.section-heading {
  max-width: 850px;
  margin-bottom: 38px;
}

.explain-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.65fr);
  gap: 42px;
  align-items: start;
}

.explain-copy {
  color: var(--color-ink-muted);
  font-size: 17px;
}

.explain-copy p + p {
  margin-top: 20px;
}

.stream-support-table {
  width: 100%;
  min-width: 900px;
  border-collapse: collapse;
  font-size: 14px;
}

.stream-support-table th,
.stream-support-table td {
  padding: 15px 16px;
  border-bottom: 1px solid var(--color-border);
  text-align: left;
  vertical-align: middle;
}

.stream-support-table th {
  background: var(--color-surface-soft);
  color: var(--color-ink);
  font-weight: 750;
}

.stream-support-table td:first-child {
  color: var(--color-ink);
  font-weight: 750;
}

.stream-support-table tr:last-child td {
  border-bottom: 0;
}

.table-note {
  max-width: 920px;
  margin-top: 18px;
  color: var(--color-ink-muted);
  font-size: 14px;
}

.ip-comparison {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.ip-panel {
  padding: 30px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  box-shadow: 0 8px 24px var(--color-shadow);
}

.ip-panel h3 {
  margin-top: 20px;
}

.ip-panel p {
  color: var(--color-ink-muted);
}

.selection-principle {
  margin-top: 24px;
  padding: 26px 30px;
  border-left: 4px solid var(--color-accent);
  background: var(--color-surface-soft);
}

.selection-principle p {
  color: var(--color-ink-muted);
}

.quality-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(300px, 0.75fr);
  gap: 34px;
  align-items: start;
}

.quality-points {
  display: grid;
  gap: 28px;
}

.quality-points article {
  padding-bottom: 27px;
  border-bottom: 1px solid var(--color-border);
}

.quality-points article:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.quality-points p {
  color: var(--color-ink-muted);
}

.quality-checklist {
  padding: 28px;
  box-shadow: var(--shadow-card);
}

.quality-checklist ul {
  display: grid;
  gap: 12px;
  margin: 20px 0 0;
  padding: 0;
  color: var(--color-ink-muted);
  list-style: none;
}

.quality-checklist li {
  position: relative;
  padding-left: 24px;
}

.quality-checklist li::before {
  position: absolute;
  top: 0;
  left: 0;
  color: var(--color-success);
  content: "✓";
  font-weight: 800;
}

.error-guide {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--color-border);
  border-left: 1px solid var(--color-border);
}

.error-item {
  min-width: 0;
  padding: 28px;
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.error-item h3 {
  font-size: 21px;
}

.error-item p {
  color: var(--color-ink-muted);
}

.route-practice {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--color-border);
}

.route-practice-step {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 22px;
  padding-top: 28px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--color-border);
}

.route-practice-mark {
  display: inline-flex;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  color: var(--color-accent-deep);
  font-family: var(--font-mono);
  font-weight: 750;
}

.route-practice-step p {
  color: var(--color-ink-muted);
}

.route-notice {
  margin-top: 34px;
}

.stream-next {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 46px;
  align-items: center;
  padding: 38px;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-md);
  background: var(--color-surface-soft);
  box-shadow: var(--shadow-card);
}

.stream-next h2 {
  font-size: clamp(30px, 4vw, 42px);
}

.stream-next p {
  max-width: 800px;
  color: var(--color-ink-muted);
}

.stream-next-links {
  display: grid;
  min-width: 190px;
  gap: 12px;
}

@media (max-width: 1080px) {
  .stream-hero {
    min-height: 0;
  }

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

  .stream-selector {
    max-width: 780px;
  }

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

  .quality-checklist {
    max-width: 720px;
  }
}

@media (max-width: 768px) {
  .stream-hero-grid {
    display: none;
  }

  .stream-selector-body {
    grid-template-columns: 72px minmax(80px, 1fr) 72px;
    gap: 10px;
    min-height: 170px;
    padding: 26px 15px;
  }

  .stream-device-icon,
  .stream-target-icon {
    width: 48px;
    height: 48px;
  }

  .stream-paths {
    gap: 18px;
  }

  .explain-grid,
  .ip-comparison,
  .error-guide,
  .stream-next {
    grid-template-columns: 1fr;
  }

  .error-guide {
    border-left: 0;
  }

  .error-item {
    padding: 24px 20px;
    border-left: 1px solid var(--color-border);
  }

  .stream-next {
    gap: 28px;
    padding: 28px 22px;
  }

  .stream-next-links {
    width: 100%;
    min-width: 0;
  }
}

@media (max-width: 520px) {
  .stream-selector-title {
    display: none;
  }

  .stream-selector-body {
    grid-template-columns: 58px minmax(60px, 1fr) 58px;
    padding-inline: 10px;
  }

  .stream-source,
  .stream-target {
    font-size: 11px;
  }

  .stream-device-icon,
  .stream-target-icon {
    width: 42px;
    height: 42px;
  }

  .stream-platform-list {
    padding-inline: 14px;
  }

  .ip-panel {
    padding: 24px 20px;
  }

  .selection-principle {
    padding: 22px 20px;
  }

  .route-practice-step {
    grid-template-columns: 42px minmax(0, 1fr);
    gap: 14px;
  }

  .route-practice-mark {
    width: 36px;
    height: 36px;
  }
}