:root {
  color-scheme: light;
  --ink: #111827;
  --muted: #536176;
  --line: #d9e0e8;
  --soft: #f3f6f8;
  --white: #ffffff;
  --green: #087f5b;
  --green-dark: #056447;
  --coral: #c2412d;
  --charcoal: #1d242b;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: "Segoe UI", "Microsoft YaHei UI", "Microsoft YaHei", sans-serif;
  letter-spacing: 0;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 max(24px, calc((100vw - 1200px) / 2));
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-weight: 750;
  white-space: nowrap;
}

.brand-mark {
  width: 25px;
  height: 20px;
  display: inline-block;
  border: 2px solid var(--ink);
  border-radius: 4px;
  position: relative;
}

.brand-mark::after {
  content: "";
  position: absolute;
  left: 3px;
  bottom: -5px;
  width: 7px;
  height: 7px;
  background: var(--white);
  border-left: 2px solid var(--ink);
  transform: skewY(-38deg);
}

nav { display: flex; align-items: center; gap: 28px; font-size: 14px; }
nav a:hover { color: var(--green); }

.nav-download {
  padding: 10px 15px;
  color: var(--white);
  background: var(--ink);
  border-radius: 5px;
}

nav .nav-download:hover { color: var(--white); background: var(--green-dark); }

.hero {
  min-height: min(700px, calc(100vh - 68px));
  position: relative;
  display: flex;
  align-items: center;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.hero > img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
}

.hero-shade {
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.82);
}

.hero-content {
  position: relative;
  width: min(1200px, calc(100% - 48px));
  margin: 0 auto;
  padding: 92px 0 100px;
}

.hero-content > * { max-width: 690px; }

.eyebrow {
  margin: 0 0 14px;
  color: var(--green-dark);
  font-size: 13px;
  font-weight: 750;
}

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

h1 {
  margin-bottom: 22px;
  font-size: 76px;
  line-height: 1.02;
  font-weight: 800;
}

.hero-copy {
  margin-bottom: 30px;
  color: #263447;
  font-size: 20px;
  line-height: 1.75;
}

.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }

.button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
  border: 1px solid var(--ink);
  border-radius: 6px;
  font-size: 15px;
  font-weight: 700;
  transition: background 160ms ease, color 160ms ease, transform 160ms ease;
}

.button:hover { transform: translateY(-1px); }
.button.primary { color: var(--white); background: var(--ink); }
.button.primary:hover { background: var(--green-dark); border-color: var(--green-dark); }
.button.secondary { background: rgba(255, 255, 255, 0.72); }
.button.secondary:hover { background: var(--white); }

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

.status-band {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  max-width: 1200px;
  margin: 0 auto;
  border-left: 1px solid var(--line);
  border-right: 1px solid var(--line);
}

.status-band > div { padding: 26px 30px; border-right: 1px solid var(--line); }
.status-band > div:last-child { border-right: 0; }
.status-band strong, .status-band span { display: block; }
.status-band strong { margin-bottom: 5px; font-size: 15px; }
.status-band span { color: var(--muted); font-size: 13px; }

.section {
  width: min(1200px, calc(100% - 48px));
  margin: 0 auto;
  padding: 100px 0;
}

.section-heading { max-width: 700px; margin-bottom: 54px; }
.section-heading.compact { margin-bottom: 38px; }
.section-heading h2, .privacy-band h2, .download-band h2 {
  margin-bottom: 16px;
  font-size: 44px;
  line-height: 1.16;
}
.section-heading > p:last-child { color: var(--muted); font-size: 17px; line-height: 1.7; }

.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--ink); }
.feature-grid article { min-height: 240px; padding: 28px 30px 24px 0; border-right: 1px solid var(--line); }
.feature-grid article + article { padding-left: 30px; }
.feature-grid article:last-child { border-right: 0; }
.feature-index { color: var(--coral); font: 700 13px/1 "Cascadia Mono", Consolas, monospace; }
.feature-grid h3 { margin: 42px 0 12px; font-size: 21px; }
.feature-grid p { color: var(--muted); line-height: 1.75; }

.steps-section { border-top: 1px solid var(--line); }
.steps { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.steps li { display: grid; grid-template-columns: 68px 1fr; gap: 22px; padding: 27px 0; border-bottom: 1px solid var(--line); }
.steps li > span { font: 700 18px/1.5 "Cascadia Mono", Consolas, monospace; color: var(--green); }
.steps strong { display: block; margin-bottom: 5px; font-size: 17px; }
.steps p { margin: 0; color: var(--muted); line-height: 1.65; }

.privacy-band {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 80px;
  padding: 88px max(24px, calc((100vw - 1200px) / 2));
  color: var(--white);
  background: var(--charcoal);
}
.privacy-band .eyebrow { color: #6ee7b7; }
.privacy-copy { padding-top: 8px; }
.privacy-copy p { color: #d9e1e8; font-size: 17px; line-height: 1.8; }
.privacy-copy p:last-child { margin-bottom: 0; }
.privacy-copy strong { color: #ffffff; }
code { padding: 2px 5px; color: inherit; background: rgba(255, 255, 255, 0.1); border-radius: 3px; }

.requirements dl { margin: 0; border-top: 1px solid var(--ink); }
.requirements dl > div { display: grid; grid-template-columns: 180px 1fr; padding: 20px 0; border-bottom: 1px solid var(--line); }
.requirements dt { color: var(--muted); }
.requirements dd { margin: 0; font-weight: 650; }
.notice { display: grid; grid-template-columns: 1fr 2fr; gap: 28px; margin-top: 40px; padding: 24px; background: #fff7ed; border-left: 4px solid var(--coral); }
.notice span { color: #675145; line-height: 1.65; }

.download-band {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 34px;
  padding: 60px max(24px, calc((100vw - 1200px) / 2));
  background: var(--soft);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.download-band h2 { margin-bottom: 8px; font-size: 30px; }
.download-band p { margin: 0; color: var(--muted); }
.download-band .button { flex: 0 0 auto; }

footer {
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  padding: 24px max(24px, calc((100vw - 1200px) / 2));
  color: var(--muted);
  font-size: 13px;
}
footer > span { color: var(--ink); font-weight: 750; }
footer div { display: flex; gap: 24px; }
footer a:hover { color: var(--green); }

@media (max-width: 820px) {
  .site-header { height: 60px; }
  nav > a:not(.nav-download) { display: none; }
  .nav-download { padding: 9px 11px; }
  .hero { min-height: 660px; }
  .hero-content { padding: 76px 0 82px; }
  .hero-shade { background: rgba(255, 255, 255, 0.9); }
  h1 { font-size: 40px; }
  .section-heading h2, .privacy-band h2, .download-band h2 { font-size: 34px; }
  .hero-copy { font-size: 17px; }
  .status-band { grid-template-columns: 1fr; border-left: 0; border-right: 0; }
  .status-band > div { padding: 20px 24px; border-right: 0; border-bottom: 1px solid var(--line); }
  .section { width: min(100% - 36px, 1200px); padding: 72px 0; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-grid article, .feature-grid article + article { min-height: 0; padding: 24px 0 28px; border-right: 0; border-bottom: 1px solid var(--line); }
  .feature-grid h3 { margin-top: 24px; }
  .privacy-band { grid-template-columns: 1fr; gap: 18px; padding: 64px 24px; }
  .requirements dl > div { grid-template-columns: 110px 1fr; }
  .notice { grid-template-columns: 1fr; }
  .download-band { align-items: flex-start; flex-direction: column; }
  footer { align-items: flex-start; flex-direction: column; }
  footer div { flex-wrap: wrap; gap: 12px 20px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .button { transition: none; }
}