:root {
  color-scheme: light;
  --blue: #1267f4;
  --blue-dark: #0756dc;
  --ink: #0b1220;
  --muted: #647084;
  --line: #dfe5ee;
  --soft: #f2f7ff;
  --white: #fff;
  --shadow: 0 24px 70px rgba(26, 54, 93, .14);
  --radius: 22px;
  --shell: 1180px;
}
* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: Inter, "Segoe UI", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }

.shell { width: min(calc(100% - 48px), var(--shell)); margin-inline: auto; }

.skip-link {
  position: fixed;
  z-index: 100;
  left: 16px;
  top: 12px;
  padding: 10px 14px;
  color: var(--white);
  background: var(--ink);
  border-radius: 8px;
  transform: translateY(-160%);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  background: rgba(255, 255, 255, .94);
  border-bottom: 1px solid rgba(223, 229, 238, .86);
  backdrop-filter: blur(14px);
}

.header-inner,
.footer-inner {
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-size: 23px;
  font-weight: 800;
  letter-spacing: -.03em;
}

nav { display: flex; align-items: center; gap: 34px; }
nav a { color: #313b4b; font-size: 15px; font-weight: 650; }
nav a:hover { color: var(--blue); }

.hero {
  min-height: 720px;
  padding-block: 100px 92px;
  display: grid;
  grid-template-columns: .84fr 1.16fr;
  align-items: center;
  gap: 70px;
}

.hero h1 {
  margin: 0;
  max-width: 580px;
  font-size: clamp(52px, 5vw, 78px);
  line-height: 1.1;
  letter-spacing: -.055em;
}

.hero-copy > p:not(.hero-note) {
  margin: 28px 0 34px;
  color: var(--muted);
  font-size: 20px;
}

.actions { display: flex; align-items: center; flex-wrap: wrap; gap: 14px; }

.button {
  min-height: 54px;
  padding: 0 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border: 1px solid transparent;
  border-radius: 11px;
  font-size: 15px;
  font-weight: 750;
  transition: transform .18s ease, background .18s ease, border-color .18s ease;
}
.button:hover { transform: translateY(-2px); }
.button:focus-visible, nav a:focus-visible, .brand:focus-visible, footer a:focus-visible {
  outline: 3px solid rgba(18, 103, 244, .28);
  outline-offset: 3px;
}
.button svg { width: 21px; height: 21px; fill: none; stroke: currentColor; stroke-width: 1.9; stroke-linecap: round; stroke-linejoin: round; }
.button-secondary svg { fill: currentColor; stroke: none; }
.button-primary { color: var(--white); background: var(--blue); box-shadow: 0 12px 30px rgba(18, 103, 244, .24); }
.button-primary:hover { background: var(--blue-dark); }
.button-secondary { color: var(--ink); border-color: #bcc9dc; background: var(--white); }
.button-secondary:hover { border-color: var(--blue); color: var(--blue); }

.hero-note { margin: 18px 0 0; color: #7b8799; font-size: 13px; }

.product-frame,
.feature-visual {
  overflow: hidden;
  margin: 0;
  background: var(--white);
  border: 1px solid #d6deea;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.window-bar {
  height: 48px;
  padding: 0 17px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: #536075;
  background: #f8fafc;
  border-bottom: 1px solid #e5e9f0;
  font-size: 13px;
  font-weight: 650;
}
.window-bar i { width: 10px; height: 10px; border-radius: 50%; background: #d8dee8; }
.window-bar i:first-child { background: #ff655d; }
.window-bar i:nth-child(2) { background: #ffbd2e; }
.window-bar i:nth-child(3) { margin-right: 10px; background: #28c840; }
.product-frame > img { width: 100%; aspect-ratio: 1.46 / 1; object-fit: cover; object-position: top; }

.steps { padding: 110px 0; background: var(--soft); }
.section-heading h2 { margin: 0; font-size: clamp(36px, 4vw, 54px); line-height: 1.15; letter-spacing: -.045em; }
.section-heading p { margin: 16px 0 0; color: var(--muted); font-size: 18px; }
.centered { text-align: center; }

.step-list {
  margin: 72px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  list-style: none;
}
.step-list li { position: relative; display: grid; grid-template-columns: 68px 1fr; gap: 18px; padding: 0 40px; }
.step-list li:first-child { padding-left: 0; }
.step-list li:last-child { padding-right: 0; }
.step-list li:not(:last-child)::after { content: ""; position: absolute; width: 44px; height: 1px; right: -22px; top: 34px; background: #8bb3fa; }
.step-list b { color: var(--blue); font-size: 56px; line-height: 1; letter-spacing: -.05em; }
.step-list h3, .feature-list h3 { margin: 0; font-size: 21px; line-height: 1.35; }
.step-list p, .feature-list p { margin: 7px 0 0; color: var(--muted); font-size: 14px; }

.features { padding: 124px 0; }
.feature-layout { display: grid; grid-template-columns: 1.04fr .96fr; align-items: center; gap: 92px; }
.feature-visual { background: #edf4ff; transform: rotate(-1deg); }
.feature-visual img { width: 100%; aspect-ratio: 1.12 / 1; object-fit: cover; object-position: top; transform: rotate(1deg) scale(1.025); }
.feature-list { margin: 42px 0 0; padding: 0; list-style: none; }
.feature-list li { padding: 22px 0; display: grid; grid-template-columns: 48px 1fr; gap: 18px; border-bottom: 1px solid var(--line); }
.feature-list span { color: var(--blue); font-size: 15px; font-weight: 800; }

.engines { border-block: 1px solid var(--line); }
.engine-row { min-height: 108px; display: flex; align-items: center; justify-content: space-between; gap: 26px; color: #697589; font-size: 15px; font-weight: 750; letter-spacing: .01em; }

.download-section { padding: 108px 0; color: var(--white); background: var(--blue); }
.download-inner { text-align: center; }
.download-inner h2 { margin: 0; font-size: clamp(42px, 5vw, 66px); line-height: 1.08; letter-spacing: -.05em; }
.download-inner p { margin: 18px 0 34px; color: rgba(255,255,255,.82); font-size: 18px; }
.actions-center { justify-content: center; }
.button-light { color: var(--blue); background: var(--white); }
.button-outline-light { color: var(--white); border-color: rgba(255,255,255,.62); }
.button-outline-light:hover { background: rgba(255,255,255,.1); }

.privacy { padding: 98px 0; }
.privacy-layout { display: grid; grid-template-columns: repeat(2, 1fr); gap: 96px; }
.privacy-layout > div + div { padding-left: 96px; border-left: 1px solid var(--line); }
.privacy h2 { margin: 0; font-size: 29px; letter-spacing: -.035em; }
.privacy p { margin: 15px 0 0; color: var(--muted); }

footer { border-top: 1px solid var(--line); }
.footer-inner { color: #6b7688; font-size: 14px; }
.footer-inner span { color: var(--ink); font-weight: 750; }
.footer-inner a:hover { color: var(--blue); }
.footer-links { display: flex; align-items: center; flex-wrap: wrap; gap: 22px; }

.legal-main { padding: 72px 0 104px; }
.legal-card { max-width: 820px; }
.legal-card h1 { margin: 0 0 14px; font-size: clamp(42px, 7vw, 70px); letter-spacing: -.055em; }
.legal-card .updated { margin: 0 0 42px; color: var(--muted); }
.legal-card h2 { margin: 38px 0 12px; font-size: 24px; letter-spacing: -.025em; }
.legal-card p, .legal-card li { color: var(--muted); }
.legal-card ul { padding-left: 22px; }
.legal-card a { color: var(--blue); text-decoration: underline; text-underline-offset: 3px; }

@media (max-width: 920px) {
  .hero { min-height: auto; padding-block: 76px; grid-template-columns: 1fr; gap: 52px; }
  .hero h1 { max-width: 700px; }
  .feature-layout { grid-template-columns: 1fr; gap: 62px; }
  .feature-visual { max-width: 720px; }
  .step-list li { grid-template-columns: 52px 1fr; padding-inline: 20px; }
  .step-list b { font-size: 44px; }
  .privacy-layout { gap: 50px; }
  .privacy-layout > div + div { padding-left: 50px; }
}

@media (max-width: 680px) {
  .shell { width: min(calc(100% - 32px), var(--shell)); }
  .header-inner { min-height: 66px; }
  .brand { font-size: 20px; }
  .brand img { width: 32px; height: 32px; }
  nav { gap: 17px; }
  nav a { font-size: 13px; }
  nav a:first-child { display: none; }
  .hero { padding-block: 60px 70px; }
  .hero h1 { font-size: clamp(43px, 13vw, 60px); }
  .hero-copy > p:not(.hero-note) { font-size: 17px; }
  .actions { align-items: stretch; flex-direction: column; }
  .button { width: 100%; }
  .steps, .features, .privacy { padding-block: 78px; }
  .step-list { margin-top: 50px; grid-template-columns: 1fr; gap: 36px; }
  .step-list li { padding: 0; grid-template-columns: 54px 1fr; }
  .step-list li::after { display: none; }
  .feature-layout { gap: 46px; }
  .feature-list { margin-top: 28px; }
  .engine-row { min-height: 0; padding-block: 36px; flex-wrap: wrap; justify-content: center; }
  .download-section { padding-block: 82px; }
  .privacy-layout { grid-template-columns: 1fr; gap: 42px; }
  .privacy-layout > div + div { padding: 42px 0 0; border-left: 0; border-top: 1px solid var(--line); }
  .footer-inner { min-height: 70px; align-items: flex-start; flex-direction: column; justify-content: center; gap: 12px; padding-block: 18px; }
  .footer-links { gap: 12px 18px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}