.streaming-hero {
  position: relative;
  max-width: 100%;
  overflow-x: clip;
  padding-top: 72px;
  padding-bottom: 80px;
  border-bottom: 1px solid var(--color-border);
  background: linear-gradient(180deg, var(--color-hero-top), var(--color-hero-bottom));
}

.streaming-hero::before {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(var(--color-dot) 1px, transparent 1.2px);
  background-size: 18px 18px;
  content: "";
  pointer-events: none;
  -webkit-mask-image: linear-gradient(90deg, transparent, var(--color-text), transparent);
  mask-image: linear-gradient(90deg, transparent, var(--color-text), transparent);
}

.streaming-hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(440px, 1.08fr);
  gap: 58px;
  align-items: center;
}

.streaming-hero-copy {
  position: relative;
  z-index: 1;
}

.streaming-hero-copy h1 {
  max-width: 680px;
}

.streaming-hero-copy .lead {
  max-width: 650px;
}

.streaming-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

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

.streaming-console::before {
  position: absolute;
  z-index: -1;
  inset: 8px -8px -8px 8px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-panel-muted);
  content: "";
}

.streaming-console-head {
  display: flex;
  min-height: 48px;
  align-items: center;
  gap: 10px;
  padding-inline: 16px;
  border-bottom: 1px solid var(--color-border);
  background: linear-gradient(180deg, var(--color-panel), var(--color-chrome-bottom));
}

.streaming-console-head strong {
  font-size: 13px;
}

.streaming-console-head .mono {
  margin-left: auto;
  color: var(--color-text-muted);
  font-size: 11px;
}

.signal-stack {
  display: flex;
  align-items: center;
  flex-direction: column;
  padding: 28px;
}

.signal-card {
  display: grid;
  width: 100%;
  grid-template-columns: 64px minmax(0, 1fr) auto;
  gap: 14px;
  align-items: center;
  padding: 15px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  box-shadow: var(--small-shadow);
}

.signal-card h2 {
  margin-bottom: 3px;
  font-size: 16px;
  letter-spacing: 0;
}

.signal-card p {
  margin-bottom: 0;
  color: var(--color-text-muted);
  font-size: 12px;
  line-height: 1.5;
}

.signal-index {
  display: grid;
  min-height: 36px;
  place-items: center;
  border-radius: var(--radius-sm);
  background: var(--color-panel-muted);
  color: var(--color-text-muted);
  font-size: 10px;
}

.signal-line {
  width: 1px;
  height: 18px;
  background: var(--color-border);
}

.streaming-console-foot {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px 20px;
  padding: 12px 16px;
  border-top: 1px solid var(--color-border);
  background: var(--color-panel-muted);
  color: var(--color-text-muted);
  font-size: 10px;
}

.streaming-content {
  overflow-x: clip;
}

.streaming-band {
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-panel-muted);
  background-image: radial-gradient(var(--color-dot) 1px, transparent 1.2px);
  background-size: 18px 18px;
}

.explain-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.explain-card {
  padding: 26px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  box-shadow: var(--small-shadow);
}

.explain-label {
  display: inline-flex;
  margin-bottom: 18px;
  color: var(--color-accent-dark);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.explain-card h3 {
  font-size: 20px;
}

.explain-card p {
  margin-bottom: 0;
  color: var(--color-text-muted);
  font-size: 14px;
}

.streaming-table td {
  min-width: 150px;
}

.streaming-table td:first-child {
  min-width: 140px;
  font-family: var(--font-display);
}

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

.format-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(300px, 0.65fr);
  gap: 38px;
  align-items: start;
}

.definition-list {
  display: grid;
  gap: 14px;
}

.definition-card {
  padding: 24px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  box-shadow: var(--small-shadow);
}

.definition-card h3 {
  font-size: 20px;
}

.definition-card p {
  margin-bottom: 0;
  color: var(--color-text-muted);
}

.selection-panel {
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.selection-panel h2 {
  font-size: 30px;
}

.check-list {
  display: grid;
  gap: 20px;
  margin: 24px 0 30px;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding-left: 24px;
}

.check-list li::before {
  position: absolute;
  top: 3px;
  left: 0;
  color: var(--color-success);
  content: "✓";
  font-weight: 700;
}

.check-list strong,
.check-list span {
  display: block;
}

.check-list strong {
  margin-bottom: 4px;
  color: var(--color-text);
}

.check-list span {
  color: var(--color-text-muted);
  font-size: 13px;
}

.selection-panel .btn {
  width: 100%;
}

.quality-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(280px, 0.55fr);
  gap: 28px;
  align-items: start;
}

.quality-track {
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-panel);
  box-shadow: var(--panel-shadow);
}

.quality-row {
  display: grid;
  grid-template-columns: 78px minmax(0, 1fr);
  gap: 22px;
  padding: 26px;
  border-bottom: 1px solid var(--color-border);
}

.quality-row:last-child {
  border-bottom: 0;
}

.quality-key {
  display: grid;
  height: 38px;
  place-items: center;
  border-radius: var(--radius-sm);
  background: var(--color-panel-muted);
  color: var(--color-accent-dark);
  font-size: 10px;
  font-weight: 700;
}

.quality-row h3 {
  font-size: 19px;
}

.quality-row p {
  margin-bottom: 0;
  color: var(--color-text-muted);
}

.quality-callout {
  margin-block: 0;
}

.error-browser {
  display: grid;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-panel);
  box-shadow: var(--panel-shadow);
}

.error-item {
  padding: 26px;
  border-bottom: 1px solid var(--color-border);
}

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

.error-title {
  display: flex;
  gap: 14px;
  align-items: center;
  margin-bottom: 12px;
}

.error-title h3 {
  margin-bottom: 0;
  font-size: 19px;
}

.error-mark {
  display: grid;
  width: 30px;
  height: 30px;
  flex: none;
  place-items: center;
  border-radius: var(--radius-sm);
  background: var(--color-accent-soft);
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-weight: 700;
}

.error-item p {
  margin: 0 0 0 44px;
  color: var(--color-text-muted);
}

.diagnostic-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.diagnostic-card {
  min-height: 250px;
  padding: 24px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  box-shadow: var(--small-shadow);
}

.diagnostic-card h3 {
  margin-top: 22px;
  font-size: 19px;
}

.diagnostic-card p {
  margin-bottom: 0;
  color: var(--color-text-muted);
  font-size: 14px;
}

.next-links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.next-link-card {
  display: flex;
  min-height: 280px;
  align-items: flex-start;
  flex-direction: column;
  padding: 32px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--color-panel), var(--color-panel-muted));
  box-shadow: var(--panel-shadow);
}

.next-link-card h2 {
  font-size: 28px;
}

.next-link-card p {
  color: var(--color-text-muted);
}

.next-link-card .btn {
  margin-top: auto;
}

@media (max-width: 1000px) {
  .streaming-hero-grid {
    grid-template-columns: 1fr;
  }

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

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

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

@media (max-width: 768px) {
  .streaming-hero {
    padding-top: 54px;
    padding-bottom: 60px;
  }

  .streaming-hero-grid,
  .format-grid {
    grid-template-columns: 1fr;
    gap: 34px;
  }

  .explain-grid,
  .next-links {
    grid-template-columns: 1fr;
  }

  .selection-panel {
    position: static;
  }

  .signal-stack {
    padding: 20px;
  }

  .diagnostic-card {
    min-height: 0;
  }
}

@media (max-width: 640px) {
  .streaming-actions {
    width: 100%;
    flex-direction: column;
  }

  .streaming-actions .btn {
    width: 100%;
  }

  .signal-card {
    grid-template-columns: 52px minmax(0, 1fr);
  }

  .signal-card > .badge {
    grid-column: 2;
    justify-self: start;
  }

  .signal-index {
    align-self: stretch;
  }

  .quality-row {
    grid-template-columns: 1fr;
    gap: 14px;
    padding: 20px;
  }

  .quality-key {
    width: max-content;
    min-width: 70px;
    padding-inline: 10px;
  }

  .error-item {
    padding: 20px;
  }

  .error-item p {
    margin-left: 0;
  }

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

  .next-link-card {
    min-height: 0;
    padding: 24px;
  }
}

@media (max-width: 420px) {
  .streaming-console-head .mono {
    display: none;
  }

  .signal-card {
    grid-template-columns: 1fr;
  }

  .signal-card > .badge {
    grid-column: auto;
  }

  .signal-index {
    width: max-content;
    min-width: 64px;
    padding-inline: 8px;
  }
}