:root {
  --signal-primary: #2c6bed;
  --signal-secondary: #9dbbf8;
  --signal-bg: #ffffff;
  --signal-surface: #f6f6f6;
  --signal-text: #1b1b1b;
  --signal-muted: #69748c;
  --on-primary: var(--on-primary, #ffffff);
  --signal-border: color-mix(in srgb, var(--signal-muted) 22%, var(--signal-bg));
  --signal-footer-bg: color-mix(in srgb, var(--signal-text) 84%, var(--signal-primary) 16%);
  --signal-footer-text: #e9e9e9;
  --signal-radius: 8px;
  --signal-shell: 1368px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--signal-bg);
  color: var(--signal-text);
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.5;
  letter-spacing: 0;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--signal-primary) 60%, var(--signal-bg));
  outline-offset: 3px;
}

.signal-shell {
  width: min(calc(100% - 32px), var(--signal-shell));
  margin-inline: auto;
}

.signal-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  min-height: 85px;
  background: var(--signal-bg);
  border-bottom: 1px solid transparent;
}

.signal-nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 85px;
  gap: 32px;
}

.signal-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.signal-brand img {
  width: 154px;
  height: 44px;
  object-fit: contain;
}

.signal-brand span {
  color: var(--signal-muted);
  font-size: 14px;
  white-space: nowrap;
}

.signal-nav__links {
  display: flex;
  align-items: center;
  gap: 4px;
  color: var(--signal-text);
}

.signal-nav__links a {
  display: flex;
  align-items: center;
  min-height: 52px;
  padding: 8px 12px;
  border-radius: var(--signal-radius);
  transition: background-color 180ms ease, color 180ms ease;
}

.signal-nav__links a:hover {
  background: var(--signal-surface);
  color: var(--signal-primary);
}

.signal-hero {
  min-height: 680px;
  margin-bottom: 64px;
  overflow: hidden;
  background: var(--signal-secondary);
}

.signal-hero__grid {
  display: grid;
  grid-template-columns: minmax(320px, 523px) minmax(520px, 1fr);
  min-height: 680px;
  gap: 32px;
}

.signal-hero__copy {
  position: relative;
  z-index: 2;
  padding-top: 120px;
}

.signal-eyebrow {
  margin: 0 0 16px;
  color: var(--signal-primary);
  font-size: 14px;
  font-weight: 700;
}

.signal-hero h1 {
  margin: 0 0 24px;
  max-width: 560px;
  color: var(--signal-text);
  font-size: 60px;
  line-height: 64px;
  font-weight: 800;
  letter-spacing: 0;
}

.signal-hero__lead {
  margin: 0;
  max-width: 523px;
  font-size: 20px;
  line-height: 28px;
}

.signal-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  margin-top: 24px;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: var(--signal-radius);
  font-weight: 700;
  cursor: pointer;
  transition: transform 160ms ease, background-color 160ms ease, border-color 160ms ease;
}

.signal-button:hover {
  transform: translateY(-1px);
}

.signal-button--light {
  background: var(--signal-bg);
  color: var(--signal-primary);
}

.signal-button--primary {
  background: var(--signal-primary);
  color: var(--on-primary);
}

.signal-button--ghost {
  border-color: var(--signal-border);
  background: var(--signal-bg);
  color: var(--signal-primary);
}

.signal-button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.signal-hero__phones {
  position: relative;
  min-height: 680px;
}

.signal-hero__phone {
  position: absolute;
  width: min(42vw, 547px);
  max-width: none;
  pointer-events: none;
}

.signal-hero__phone--left {
  left: -28px;
  top: 58px;
}

.signal-hero__phone--right {
  left: 270px;
  top: 0;
  width: min(39vw, 506px);
}

.signal-section {
  padding: 48px 0;
}

.signal-section--intro {
  padding-top: 0;
}

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

.signal-center h2,
.signal-info h2,
.signal-page__heading h1 {
  margin: 0 0 16px;
  font-size: 40px;
  line-height: 44px;
  font-weight: 800;
}

.signal-center p,
.signal-info p,
.signal-page__heading p {
  margin: 0;
  color: var(--signal-muted);
  font-size: 20px;
  line-height: 28px;
}

.signal-center p {
  max-width: 760px;
  margin-inline: auto;
}

.signal-info__grid {
  display: grid;
  grid-template-columns: 432px minmax(0, 1fr);
  align-items: center;
  gap: 96px;
}

.signal-info--reverse .signal-info__grid {
  grid-template-columns: minmax(0, 1fr) 432px;
}

.signal-info__visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.signal-info__visual img {
  max-height: 520px;
  object-fit: contain;
}

.signal-text-link {
  display: inline-flex;
  margin-top: 24px;
  color: var(--signal-primary);
  font-weight: 700;
}

.signal-features {
  background: var(--signal-surface);
}

.signal-feature-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.signal-feature-grid article {
  min-width: 0;
  padding: 30px;
  border: 1px solid var(--signal-border);
  border-radius: var(--signal-radius);
  background: var(--signal-bg);
}

.signal-feature-grid img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: contain;
}

.signal-feature-grid h3 {
  margin: 18px 0 4px;
  font-size: 28px;
  line-height: 32px;
  font-weight: 800;
}

.signal-feature-grid p {
  margin: 0;
  color: var(--signal-muted);
}

.signal-page {
  min-height: 60vh;
}

.signal-page__heading {
  max-width: 820px;
  margin: 0 auto 48px;
  text-align: center;
}

.signal-download,
.signal-list {
  padding: 64px 0 72px;
  background: var(--signal-surface);
}

.signal-download__grid {
  display: grid;
  gap: 24px;
}

.signal-download-card {
  display: grid;
  grid-template-columns: minmax(260px, 43%) minmax(0, 1fr);
  align-items: center;
  gap: 40px;
  padding: 32px;
  border: 1px solid var(--signal-border);
  border-radius: var(--signal-radius);
  background: var(--signal-bg);
}

.signal-download-card h2,
.signal-install-notes h2 {
  margin: 0 0 12px;
  font-size: 30px;
  line-height: 36px;
  font-weight: 800;
}

.signal-download-card p {
  margin: 0 0 4px;
  color: var(--signal-muted);
  font-size: 18px;
  line-height: 28px;
}

.signal-install-notes,
.signal-download__content,
.signal-article__source,
.signal-article__cta {
  margin-top: 24px;
  padding: 28px;
  border: 1px solid var(--signal-border);
  border-radius: var(--signal-radius);
  background: var(--signal-bg);
}

.signal-install-notes ul {
  margin: 0;
  padding-left: 1.3em;
  color: var(--signal-muted);
}

.signal-install-notes li + li {
  margin-top: 8px;
}

.signal-post-list {
  display: grid;
  gap: 16px;
  max-width: 960px;
  margin-inline: auto;
}

.signal-post-card {
  border: 1px solid var(--signal-border);
  border-radius: var(--signal-radius);
  background: var(--signal-bg);
  transition: border-color 180ms ease, transform 180ms ease;
}

.signal-post-card:hover {
  border-color: color-mix(in srgb, var(--signal-primary) 42%, var(--signal-border));
  transform: translateY(-1px);
}

.signal-post-card__body {
  display: block;
  padding: 28px;
}

.signal-post-card__meta,
.signal-article__meta {
  color: var(--signal-muted);
  font-size: 14px;
}

.signal-post-card h2 {
  margin: 8px 0 10px;
  font-size: 28px;
  line-height: 34px;
  font-weight: 800;
}

.signal-post-card p {
  margin: 0;
  color: var(--signal-muted);
}

.signal-read-more {
  display: inline-flex;
  margin-top: 16px;
  color: var(--signal-primary);
  font-weight: 700;
}

.signal-article {
  width: min(calc(100% - 32px), 774px);
  margin: 0 auto;
  padding: 48px 0 72px;
}

.signal-article__header {
  text-align: center;
}

.signal-article__header h1 {
  margin: 0 0 12px;
  font-size: 42px;
  line-height: 48px;
  font-weight: 800;
}

.signal-article__cover {
  width: 100%;
  margin: 40px 0 36px;
  border-radius: var(--signal-radius);
}

.signal-content {
  color: var(--signal-text);
  font-size: 20px;
  line-height: 1.55;
}

.signal-content > *:first-child {
  margin-top: 0;
}

.signal-content p,
.signal-content ul,
.signal-content ol {
  margin: 0 0 1.35em;
}

.signal-content h2 {
  margin: 2em 0 0.7em;
  font-size: 30px;
  line-height: 36px;
}

.signal-content h3 {
  margin: 1.8em 0 0.6em;
  font-size: 24px;
  line-height: 30px;
}

.signal-content a {
  color: var(--signal-primary);
  font-weight: 700;
}

.signal-content img {
  margin: 28px 0;
  border-radius: var(--signal-radius);
}

.signal-article__source h2,
.signal-article__cta h2 {
  margin: 0 0 8px;
  font-size: 24px;
}

.signal-article__source p,
.signal-article__cta p {
  margin: 0 0 16px;
  color: var(--signal-muted);
}

.signal-article__cta p {
  margin-bottom: 0;
}

.signal-footer {
  padding: 48px 0;
  background: var(--signal-footer-bg);
  color: var(--signal-footer-text);
}

.signal-footer__grid {
  display: grid;
  grid-template-columns: minmax(260px, 1.6fr) repeat(3, minmax(140px, 1fr));
  gap: 32px;
}

.signal-footer img {
  width: 154px;
  height: 44px;
  object-fit: contain;
  filter: brightness(0) invert(1);
}

.signal-footer p {
  max-width: 460px;
  color: color-mix(in srgb, var(--signal-footer-text) 84%, transparent);
}

.signal-footer h2 {
  margin: 0 0 12px;
  font-size: 16px;
}

.signal-footer a {
  display: block;
  margin: 8px 0;
  color: color-mix(in srgb, var(--signal-footer-text) 88%, transparent);
}

@media (max-width: 980px) {
  .signal-nav__inner {
    align-items: flex-start;
    flex-direction: column;
    padding: 14px 0;
  }

  .signal-nav__links {
    width: 100%;
    overflow-x: auto;
    padding-bottom: 4px;
  }

  .signal-hero,
  .signal-hero__grid {
    min-height: auto;
  }

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

  .signal-hero__copy {
    padding-top: 56px;
    padding-bottom: 24px;
  }

  .signal-hero h1 {
    font-size: 48px;
    line-height: 54px;
  }

  .signal-hero__phones {
    min-height: 520px;
  }

  .signal-hero__phone {
    width: min(58vw, 390px);
  }

  .signal-hero__phone--left {
    left: 4%;
    top: 18px;
  }

  .signal-hero__phone--right {
    left: 40%;
    width: min(54vw, 360px);
  }

  .signal-info__grid,
  .signal-info--reverse .signal-info__grid,
  .signal-download-card,
  .signal-footer__grid {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 560px) {
  .signal-shell {
    width: min(calc(100% - 24px), var(--signal-shell));
  }

  .signal-brand img {
    width: 132px;
    height: auto;
  }

  .signal-hero {
    margin-bottom: 40px;
  }

  .signal-hero h1 {
    font-size: 40px;
    line-height: 46px;
  }

  .signal-hero__lead,
  .signal-center p,
  .signal-info p,
  .signal-page__heading p,
  .signal-content {
    font-size: 18px;
    line-height: 1.55;
  }

  .signal-hero__phones {
    min-height: 390px;
  }

  .signal-center h2,
  .signal-info h2,
  .signal-page__heading h1 {
    font-size: 32px;
    line-height: 38px;
  }

  .signal-section {
    padding: 36px 0;
  }

  .signal-download-card,
  .signal-install-notes,
  .signal-download__content,
  .signal-post-card__body,
  .signal-article__cta {
    padding: 22px;
  }

  .signal-button-row {
    flex-direction: column;
  }

  .signal-button {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}