:root {
  color-scheme: dark;

  --ys-font-sans: "Google Sans", "Roboto Flex", Roboto, system-ui, -apple-system,
    BlinkMacSystemFont, "Segoe UI", sans-serif;
  --ys-font-mono: "Roboto Mono", "SFMono-Regular", Consolas, monospace;

  /* Бренд-акцент — синий Google Health (как в приложении, app_theme seed #0B57D1),
     тона подобраны под тёмный фон лендинга. Менять здесь → красит весь сайт. */
  --md-sys-color-primary: #8ab4f8;
  --md-sys-color-on-primary: #0a305f;
  --md-sys-color-primary-container: #284777;
  --md-sys-color-on-primary-container: #d6e3ff;
  --md-sys-color-surface: #121214;
  --md-sys-color-surface-container-low: #18181b;
  --md-sys-color-surface-container: #1d1d21;
  --md-sys-color-surface-container-high: #25252a;
  --md-sys-color-on-surface: #e8e3ea;
  --md-sys-color-on-surface-variant: #c9c4cf;
  --md-sys-color-outline: #8f8a96;
  --md-sys-color-outline-variant: #3f3d46;
  --md-sys-color-error: #ffb4ab;
  --md-sys-color-on-error: #690005;

  --ys-fg: var(--md-sys-color-on-surface);
  --ys-muted: var(--md-sys-color-on-surface-variant);
  --ys-bg: var(--md-sys-color-surface);
  --ys-accent: var(--md-sys-color-primary);
  --ys-border: color-mix(in srgb, var(--md-sys-color-outline-variant) 82%, transparent);

  --ys-container: 1184px;
  --ys-radius: 8px;
  --ys-radius-pill: 999px;
  --ys-nav-height: 72px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--ys-bg);
  color: var(--ys-fg);
  font-family: var(--ys-font-sans);
  line-height: 1.5;
  overflow-x: hidden;
  text-rendering: geometricPrecision;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    linear-gradient(90deg, color-mix(in srgb, var(--ys-fg) 4%, transparent) 1px, transparent 1px),
    linear-gradient(color-mix(in srgb, var(--ys-fg) 4%, transparent) 1px, transparent 1px);
  background-size: 96px 96px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, .65), transparent 58%);
}

a {
  color: inherit;
}

.material-symbols-outlined {
  display: inline-block;
  font-family: "Material Symbols Outlined";
  font-size: 22px;
  font-style: normal;
  font-weight: normal;
  line-height: 1;
}

.site-nav {
  position: sticky;
  top: 0;
  z-index: 10;
  min-height: var(--ys-nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px clamp(20px, 4vw, 56px);
  background: color-mix(in srgb, var(--ys-bg) 88%, transparent);
  border-bottom: 1px solid var(--ys-border);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ys-fg);
  font-size: 1rem;
  font-weight: 700;
  text-decoration: none;
}

.brand-mark {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border: 1px solid color-mix(in srgb, var(--ys-accent) 42%, transparent);
  border-radius: var(--ys-radius);
  background: color-mix(in srgb, var(--ys-accent) 16%, var(--ys-bg));
  color: var(--ys-accent);
  font-weight: 800;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-links a {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  padding: 0 14px;
  border-radius: var(--ys-radius-pill);
  color: var(--ys-muted);
  font-size: .94rem;
  font-weight: 560;
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  background: var(--md-sys-color-surface-container-high);
  color: var(--ys-fg);
  outline: none;
}

.container {
  width: min(var(--ys-container), calc(100vw - 48px));
  margin: 0 auto;
}

.hero {
  min-height: calc(100svh - var(--ys-nav-height));
  display: flex;
  align-items: center;
  padding: clamp(42px, 7vh, 72px) 0;
  border-bottom: 1px solid var(--ys-border);
}

.hero-content {
  max-width: 1040px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 20px;
  color: var(--ys-accent);
  font-family: var(--ys-font-mono);
  font-size: .86rem;
  font-weight: 600;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 1120px;
  margin-bottom: 22px;
  color: var(--ys-fg);
  font-size: clamp(3.2rem, 6.4vw, 5.6rem);
  font-weight: 540;
  letter-spacing: 0;
  line-height: 1.02;
}

.hero-copy {
  max-width: 820px;
  margin-bottom: 28px;
  color: var(--ys-muted);
  font-size: clamp(1.08rem, 1.45vw, 1.32rem);
  line-height: 1.45;
}

.cta-title {
  max-width: 900px;
  margin-bottom: 24px;
  color: var(--ys-fg);
  font-size: clamp(2rem, 5.3vw, 5.4rem);
  font-weight: 540;
  letter-spacing: 0;
  line-height: 1.04;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.button {
  min-height: 54px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 0 24px;
  border: 1px solid transparent;
  border-radius: var(--ys-radius-pill);
  font-weight: 680;
  text-decoration: none;
}

.button.filled {
  background: var(--ys-accent);
  color: var(--md-sys-color-on-primary);
}

.button.outlined {
  border-color: var(--ys-border);
  background: color-mix(in srgb, var(--md-sys-color-surface-container) 72%, transparent);
  color: var(--ys-fg);
}

.section {
  padding: clamp(70px, 11vw, 132px) 0;
  border-bottom: 1px solid var(--ys-border);
}

.section-header {
  max-width: 820px;
  margin-bottom: 44px;
}

.section-kicker {
  margin-bottom: 14px;
  color: var(--ys-accent);
  font-family: var(--ys-font-mono);
  font-size: .78rem;
  font-weight: 700;
  text-transform: uppercase;
}

.section h2 {
  margin-bottom: 18px;
  color: var(--ys-fg);
  font-size: clamp(2.35rem, 6vw, 5.2rem);
  font-weight: 540;
  letter-spacing: 0;
  line-height: 1.04;
}

.section-header p {
  color: var(--ys-muted);
  font-size: 1.08rem;
}

.signal-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border: 1px solid var(--ys-border);
  border-radius: var(--ys-radius);
  overflow: hidden;
}

.signal {
  min-height: 154px;
  padding: 22px;
  background: color-mix(in srgb, var(--md-sys-color-surface-container-low) 92%, transparent);
  border-right: 1px solid var(--ys-border);
}

.signal:last-child {
  border-right: 0;
}

.signal b {
  display: block;
  margin-bottom: 14px;
  color: var(--ys-fg);
  font-size: 1.02rem;
}

.signal span {
  color: var(--ys-muted);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.feature-card {
  min-height: 250px;
  padding: 24px;
  border: 1px solid var(--ys-border);
  border-radius: var(--ys-radius);
  background: var(--md-sys-color-surface-container-low);
}

.feature-card .material-symbols-outlined {
  margin-bottom: 28px;
  color: var(--ys-accent);
  font-size: 28px;
}

.feature-card h3 {
  margin-bottom: 12px;
  color: var(--ys-fg);
  font-size: 1.38rem;
  line-height: 1.12;
}

.feature-card p {
  color: var(--ys-muted);
}

.workflow {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: clamp(28px, 6vw, 76px);
  align-items: start;
}

.workflow-list {
  display: grid;
  gap: 1px;
  border: 1px solid var(--ys-border);
  border-radius: var(--ys-radius);
  overflow: hidden;
}

.workflow-step {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 22px;
  padding: 24px;
  background: var(--md-sys-color-surface-container-low);
}

.step-index {
  color: var(--ys-accent);
  font-family: var(--ys-font-mono);
  font-size: .92rem;
  font-weight: 700;
}

.workflow-step h3 {
  margin-bottom: 8px;
  font-size: 1.28rem;
}

.workflow-step p {
  color: var(--ys-muted);
}

.product-frame {
  border: 1px solid var(--ys-border);
  border-radius: var(--ys-radius);
  background: var(--md-sys-color-surface-container-low);
  overflow: hidden;
}

.frame-top {
  height: 42px;
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 0 14px;
  border-bottom: 1px solid var(--ys-border);
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--md-sys-color-outline-variant);
}

.product-frame pre {
  margin: 0;
  padding: 26px;
  color: var(--ys-muted);
  font-family: var(--ys-font-mono);
  font-size: clamp(.82rem, 1.3vw, .96rem);
  line-height: 1.7;
  white-space: pre-wrap;
}

.product-frame strong {
  color: var(--ys-accent);
  font-weight: 700;
}

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

.principle {
  padding: 22px;
  border: 1px solid var(--ys-border);
  border-radius: var(--ys-radius);
  background: var(--md-sys-color-surface-container-low);
}

.principle h3 {
  margin-bottom: 10px;
  font-size: 1.22rem;
}

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

.final-cta {
  padding: clamp(72px, 12vw, 140px) 0;
}

.final-cta h2 {
  max-width: 900px;
}

.footer {
  padding: 32px 0;
  color: var(--ys-muted);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}

.footer a {
  color: var(--ys-fg);
  font-weight: 650;
  text-decoration: none;
}

.doc-page {
  padding: 34px 0 70px;
}

.doc-shell {
  max-width: 880px;
}

.doc-top {
  margin-bottom: 70px;
}

.doc-title {
  margin-bottom: 16px;
  font-size: clamp(3.5rem, 11vw, 8rem);
  line-height: .86;
}

.doc-muted {
  color: var(--ys-muted);
}

.doc-panel {
  margin: 30px 0 44px;
  padding: 24px;
  border: 1px solid var(--ys-border);
  border-radius: var(--ys-radius);
  background: var(--md-sys-color-surface-container-low);
}

.doc-page h2 {
  margin: 42px 0 12px;
  color: var(--ys-fg);
  font-size: 1.5rem;
}

.doc-page p,
.doc-page li {
  color: var(--ys-muted);
}

.doc-page strong {
  color: var(--ys-fg);
}

.doc-page a {
  color: var(--ys-accent);
  font-weight: 650;
}

@media (max-width: 900px) {
  .nav-links a:not(.nav-cta) {
    display: none;
  }

  .signal-row,
  .feature-grid,
  .workflow,
  .principles {
    grid-template-columns: 1fr;
  }

  .signal {
    border-right: 0;
    border-bottom: 1px solid var(--ys-border);
  }

  .signal:last-child {
    border-bottom: 0;
  }
}

@media (max-width: 560px) {
  .site-nav {
    padding-inline: 18px;
  }

  .nav-links {
    display: none;
  }

  .container {
    width: min(100vw - 36px, var(--ys-container));
  }

  .hero {
    min-height: auto;
    padding: 72px 0 56px;
  }

  h1 {
    font-size: clamp(3.35rem, 15vw, 5.4rem);
  }

  .button {
    width: 100%;
  }

  .workflow-step {
    grid-template-columns: 1fr;
  }

  .product-frame pre {
    padding: 20px;
  }

  .doc-title {
    font-size: clamp(3.1rem, 17vw, 5.6rem);
  }
}