:root {
  color-scheme: light;
  --primary: #0b5bd3;
  --primary-dark: #08469f;
  --ink: #172033;
  --muted: #5f697b;
  --line: #d9dee8;
  --surface: #ffffff;
  --soft: #f4f6f9;
  --mint: #dff5ed;
  --mint-ink: #146b51;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--surface);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
}

a { color: inherit; }

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

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  padding: 10px max(20px, calc((100vw - 1120px) / 2));
  border-bottom: 1px solid rgba(217, 222, 232, .86);
  background: rgba(255, 255, 255, .94);
  backdrop-filter: blur(12px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-size: 18px;
  font-weight: 700;
  text-decoration: none;
}

.brand img,
.hero-icon { border-radius: 8px; }

.header-download {
  min-width: 72px;
  padding: 9px 18px;
  border-radius: 6px;
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  text-align: center;
  text-decoration: none;
}

.hero {
  overflow: hidden;
  min-height: calc(100svh - 68px);
  padding: 64px 20px 0;
  background: linear-gradient(180deg, #f8fbff 0%, #fff 72%);
  text-align: center;
}

.hero-copy {
  width: min(720px, 100%);
  margin: 0 auto;
}

.hero-icon { margin: 0 auto 20px; }

.eyebrow {
  margin: 0 0 8px;
  color: var(--primary);
  font-size: 14px;
  font-weight: 700;
}

h1, h2, h3, p { letter-spacing: 0; }

h1 {
  margin: 0;
  font-size: clamp(40px, 7vw, 64px);
  line-height: 1.15;
}

.hero-summary {
  max-width: 620px;
  margin: 20px auto 0;
  color: var(--muted);
  font-size: 18px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-top: 30px;
}

.primary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 12px 26px;
  border-radius: 6px;
  background: var(--primary);
  box-shadow: 0 8px 20px rgba(11, 91, 211, .18);
  color: #fff;
  font-size: 17px;
  font-weight: 700;
  text-decoration: none;
}

.primary-button:hover { background: var(--primary-dark); }

.primary-button:focus-visible,
.header-download:focus-visible,
a:focus-visible {
  outline: 3px solid #72a9ff;
  outline-offset: 3px;
}

.secondary-link {
  color: var(--primary);
  font-weight: 700;
  text-decoration: none;
}

.release-meta {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.hero-preview {
  width: min(330px, 78vw);
  height: 390px;
  margin: 48px auto 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-bottom: 0;
  border-radius: 8px 8px 0 0;
  background: #fff;
  box-shadow: 0 24px 64px rgba(28, 45, 74, .16);
}

.hero-preview img { width: 100%; height: auto; }

.section-inner {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.benefits { padding: 88px 0; background: var(--soft); }

.benefits h2,
.screens h2,
.privacy-band h2,
.install h2,
.final-download h2 {
  margin: 0;
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.25;
}

.benefit-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 42px;
  border-top: 1px solid var(--line);
}

.benefit-grid article { padding: 28px 32px 0 0; }

.benefit-grid article + article {
  padding-left: 32px;
  border-left: 1px solid var(--line);
}

.step-number {
  color: var(--primary);
  font: 700 13px/1 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.benefit-grid h3 { margin: 12px 0 6px; font-size: 21px; }

.benefit-grid p,
.section-heading > p,
.privacy-layout > p,
.install-note { margin: 0; color: var(--muted); }

.screens { padding: 96px 0; }

.section-heading,
.privacy-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 480px);
  align-items: end;
  gap: 64px;
}

.screen-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 330px));
  justify-content: center;
  gap: 32px;
  margin-top: 48px;
}

.screen-strip figure { margin: 0; }

.screen-strip img {
  aspect-ratio: 9 / 19.5;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  object-fit: cover;
  object-position: top;
  box-shadow: 0 18px 45px rgba(28, 45, 74, .12);
}

.screen-strip figcaption {
  padding-top: 12px;
  color: var(--muted);
  font-size: 14px;
  text-align: center;
}

.privacy-band { padding: 74px 0; background: var(--mint); }

.privacy-band .eyebrow { color: var(--mint-ink); }

.privacy-layout > p { color: #315c50; }

.install { padding: 88px 0; }

.install ol {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin: 38px 0 24px;
  padding: 0;
  list-style-position: inside;
}

.install li {
  min-height: 126px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.install-note { font-size: 14px; }

.final-download {
  padding: 72px 0;
  border-top: 1px solid var(--line);
  background: #f8fbff;
  text-align: center;
}

.final-download .primary-button { margin-top: 26px; }

.final-download p { margin: 12px 0 0; color: var(--muted); font-size: 13px; }

footer { padding: 42px 20px 28px; background: #172033; color: #fff; }

.footer-inner {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 32px;
  width: min(1120px, 100%);
  margin: 0 auto;
}

.footer-inner strong { font-size: 18px; }

.footer-inner p { margin: 6px 0 0; color: #bdc6d5; font-size: 13px; }

.footer-inner nav { display: flex; flex-wrap: wrap; gap: 22px; }

.footer-inner a,
.icp { color: #dce3ee; font-size: 14px; text-decoration: none; }

.icp { display: block; width: max-content; margin: 30px auto 0; color: #8f9bad; }

@media (max-width: 720px) {
  .site-header { min-height: 60px; }
  .brand img { width: 36px; height: 36px; }
  .header-download { min-width: 64px; padding: 8px 14px; }
  .hero { min-height: calc(100svh - 60px); padding-top: 42px; }
  .hero-icon { width: 76px; height: 76px; }
  .hero-summary { font-size: 16px; }
  .hero-preview { height: 300px; margin-top: 38px; }
  .benefits, .screens, .install { padding: 64px 0; }
  .benefit-grid { grid-template-columns: 1fr; margin-top: 28px; }
  .benefit-grid article { padding: 24px 0; }
  .benefit-grid article + article { padding-left: 0; border-top: 1px solid var(--line); border-left: 0; }
  .section-heading, .privacy-layout { grid-template-columns: 1fr; gap: 18px; }
  .screen-strip { grid-template-columns: repeat(2, minmax(230px, 1fr)); justify-content: start; gap: 18px; overflow-x: auto; padding: 0 1px 18px; scroll-snap-type: x mandatory; }
  .screen-strip figure { scroll-snap-align: start; }
  .install ol { grid-template-columns: 1fr; gap: 12px; }
  .install li { min-height: 0; }
  .footer-inner { flex-direction: column; }
}

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