:root {
  color-scheme: light;
  --ink: #172033;
  --muted: #667085;
  --blue: #3157d5;
  --blue-dark: #2749b8;
  --line: #dfe4ec;
  --soft: #f5f7fb;
  --mint: #19b98a;
  --white: #fff;
  --shadow: 0 24px 60px rgba(23, 32, 51, .12);
  --max: 1240px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--white); font: 16px/1.7 "Microsoft YaHei UI", "PingFang SC", system-ui, sans-serif; }
a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: transparent; }
.skip-link { position: fixed; left: 16px; top: -64px; z-index: 20; padding: 8px 14px; background: var(--ink); color: white; }
.skip-link:focus { top: 12px; }

.site-header { position: sticky; top: 0; z-index: 10; display: flex; align-items: center; justify-content: space-between; min-height: 76px; padding: 0 max(28px, calc((100vw - var(--max)) / 2)); background: rgba(255,255,255,.96); border-bottom: 1px solid var(--line); backdrop-filter: blur(12px); }
.brand { display: inline-flex; align-items: center; gap: 12px; font-size: 21px; font-weight: 800; letter-spacing: -.02em; }
.brand-mark { display: inline-flex; align-items: center; justify-content: center; gap: 2px; width: 38px; height: 38px; border-radius: 9px; background: var(--blue); }
.brand-mark i { display: block; width: 2px; height: 10px; border-radius: 2px; background: white; }
.brand-mark i:nth-child(2), .brand-mark i:nth-child(4) { height: 18px; }
.brand-mark i:nth-child(3) { height: 25px; }
.site-header nav { display: flex; align-items: center; gap: 34px; font-size: 15px; font-weight: 600; }
.site-header nav > a:not(.button):hover, footer nav a:hover { color: var(--blue); }
.menu-button { display: none; border: 1px solid var(--line); background: white; border-radius: 8px; padding: 7px 11px; font: inherit; }

.button { display: inline-flex; min-height: 50px; align-items: center; justify-content: center; padding: 0 25px; border: 1px solid var(--blue); border-radius: 8px; color: white; background: var(--blue); font-weight: 700; transition: transform .18s ease, background .18s ease, box-shadow .18s ease; }
.button:hover { transform: translateY(-1px); background: var(--blue-dark); box-shadow: 0 10px 24px rgba(49,87,213,.22); }
.button:focus-visible, summary:focus-visible, a:focus-visible, button:focus-visible { outline: 3px solid rgba(49,87,213,.28); outline-offset: 3px; }
.button-outline { color: var(--blue); background: white; }
.button-outline:hover { color: white; }
.button-small { min-height: 42px; padding: 0 19px; }
.button-block { width: 100%; }
[data-unconfigured="true"] { cursor: help; }

.hero { display: grid; grid-template-columns: 1fr 1.05fr; gap: 52px; align-items: center; width: min(var(--max), calc(100% - 56px)); min-height: calc(100vh - 76px); margin: auto; padding: 78px 0 92px; }
.hero h1 { margin: 0 0 24px; font-size: clamp(48px, 4.7vw, 68px); line-height: 1.16; letter-spacing: -.055em; }
.hero-copy > p { max-width: 560px; color: var(--muted); font-size: 19px; }
.hero-actions { display: flex; gap: 14px; margin: 34px 0 18px; }
.hero .compatibility { font-size: 14px; }
.product-shot { margin: 0; padding: 12px; overflow: hidden; border: 1px solid var(--line); border-radius: 12px; background: white; box-shadow: var(--shadow); transform: perspective(1200px) rotateY(-2deg); }
.product-shot img { display: block; width: 100%; height: auto; border-radius: 7px; }

.section { width: min(var(--max), calc(100% - 56px)); margin: auto; padding: 112px 0; }
.section-heading { max-width: 680px; margin: 0 auto 68px; text-align: center; }
h2 { margin: 0 0 16px; font-size: clamp(34px, 3.8vw, 48px); line-height: 1.25; letter-spacing: -.035em; }
.section-heading p, .privacy-band p { color: var(--muted); font-size: 18px; }
.workflow-rail { position: relative; display: grid; grid-template-columns: repeat(3, 1fr); gap: 64px; margin: 0; padding: 0; list-style: none; }
.workflow-rail::before { content: ""; position: absolute; top: 23px; left: 7%; right: 7%; height: 2px; background: var(--blue); }
.workflow-rail li { position: relative; background: white; }
.workflow-rail span { position: relative; z-index: 1; display: grid; place-items: center; width: 46px; height: 46px; margin-bottom: 28px; border-radius: 50%; color: white; background: var(--blue); font-weight: 700; }
.workflow-rail h3 { margin: 0 0 8px; font-size: 24px; }
.workflow-rail p { margin: 0; color: var(--muted); }

.privacy-band { display: grid; grid-template-columns: 1fr 340px; align-items: center; gap: 80px; padding: 96px max(28px, calc((100vw - var(--max)) / 2)); background: var(--soft); }
.privacy-band > div:first-child { max-width: 760px; }
.privacy-points { display: flex; flex-wrap: wrap; gap: 20px 34px; margin: 32px 0 0; padding: 0; list-style: none; font-weight: 700; }
.privacy-points li::before { content: "✓"; display: inline-grid; place-items: center; width: 22px; height: 22px; margin-right: 9px; border: 1px solid var(--mint); border-radius: 50%; color: var(--mint); }
.shield { position: relative; display: grid; place-items: center; width: 230px; height: 260px; margin: auto; border: 4px solid var(--blue); border-radius: 110px 110px 130px 130px / 70px 70px 170px 170px; background: white; box-shadow: 0 20px 50px rgba(49,87,213,.12); }
.shield::before { content: ""; width: 68px; height: 58px; border: 5px solid var(--blue); border-radius: 10px; }
.shield::after { content: ""; position: absolute; top: 74px; width: 44px; height: 45px; border: 5px solid var(--blue); border-bottom: 0; border-radius: 28px 28px 0 0; }
.shield span { position: absolute; right: -9px; bottom: 36px; display: grid; place-items: center; width: 46px; height: 46px; border: 5px solid var(--soft); border-radius: 50%; background: var(--mint); }
.shield span::before { content: "✓"; color: white; font-size: 24px; font-weight: 800; }

.purchase { display: grid; grid-template-columns: .78fr 1.22fr; gap: 30px; align-items: start; }
.pricing-panel, .faq { border: 1px solid var(--line); border-radius: 12px; padding: 48px; }
.pricing-panel h2, .faq h2 { font-size: 34px; }
.price-label { margin: 26px 0 0; color: var(--muted); }
.price { display: flex; align-items: baseline; margin: 0 0 22px; color: var(--blue); }
.price span { font-size: 30px; font-weight: 700; }
.price strong { font-size: 74px; line-height: 1.1; letter-spacing: -.04em; }
.pricing-panel ul { display: grid; gap: 12px; margin: 20px 0 30px; padding: 0; list-style: none; }
.pricing-panel li::before { content: "✓"; margin-right: 10px; color: var(--blue); font-weight: 800; }
.text-link { display: block; margin: 12px 0 24px; color: var(--blue); text-align: center; font-weight: 700; }
.purchase-note, .payment-note { margin: 10px 0 0; color: var(--muted); font-size: 13px; }
.payment-note { color: #187b61; }
.faq details { border-top: 1px solid var(--line); }
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary { position: relative; padding: 24px 38px 24px 0; color: var(--blue); font-size: 18px; font-weight: 700; cursor: pointer; list-style: none; }
.faq summary::after { content: "+"; position: absolute; right: 4px; font-size: 24px; font-weight: 400; }
.faq details[open] summary::after { content: "−"; }
.faq details p { margin: -8px 0 24px; color: var(--muted); }

.download-band { display: flex; align-items: center; justify-content: space-between; gap: 40px; padding: 72px max(28px, calc((100vw - var(--max)) / 2)); background: var(--ink); color: white; }
.download-band h2 { font-size: 34px; }
.download-band p { margin: 0; color: #bdc7d8; }
[data-download-sha256] { overflow-wrap: anywhere; word-break: break-word; }
.download-band .button { flex: 0 0 auto; }
footer { display: grid; grid-template-columns: 1fr auto; gap: 28px; align-items: center; padding: 48px max(28px, calc((100vw - var(--max)) / 2)); border-top: 1px solid var(--line); }
footer nav { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 18px 28px; color: var(--muted); font-size: 14px; }
footer > p { grid-column: 1 / -1; margin: 0; color: var(--muted); font-size: 13px; text-align: right; }

dialog { max-width: 480px; padding: 36px; border: 0; border-radius: 12px; color: var(--ink); box-shadow: var(--shadow); }
dialog::backdrop { background: rgba(23,32,51,.52); }
dialog h2 { font-size: 26px; }
.dialog-close { position: absolute; top: 12px; right: 14px; border: 0; background: none; color: var(--muted); font-size: 28px; cursor: pointer; }
code { padding: 2px 5px; border-radius: 4px; background: var(--soft); }
.legal-page { min-height: 70vh; width: min(840px, calc(100% - 40px)); margin: auto; padding: 72px 0 110px; }
.legal-page h1 { margin: 0 0 10px; font-size: clamp(40px, 5vw, 58px); letter-spacing: -.04em; }
.legal-page h2 { margin-top: 48px; font-size: 25px; letter-spacing: -.02em; }
.legal-page p, .legal-page li { color: #475467; }
.legal-page .effective { margin-bottom: 42px; color: var(--muted); }
.legal-page a { color: var(--blue); text-decoration: underline; text-underline-offset: 3px; }
.legal-notice { padding: 18px 20px; border-left: 4px solid var(--mint); background: var(--soft); }

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } * { transition: none !important; } }
@media (max-width: 900px) {
  .menu-button { display: block; }
  .site-header nav { position: absolute; top: 76px; left: 0; right: 0; display: none; flex-direction: column; align-items: stretch; gap: 0; padding: 16px 28px 24px; background: white; border-bottom: 1px solid var(--line); box-shadow: 0 12px 24px rgba(23,32,51,.08); }
  .site-header nav.is-open { display: flex; }
  .site-header nav a { padding: 11px 0; }
  .hero { grid-template-columns: 1fr; min-height: auto; gap: 52px; padding-top: 64px; }
  .product-shot { transform: none; }
  .privacy-band { grid-template-columns: 1fr 220px; gap: 42px; }
  .shield { transform: scale(.75); }
  .purchase { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .site-header { min-height: 68px; }
  .site-header nav { top: 68px; }
  .hero, .section { width: min(100% - 36px, var(--max)); }
  .hero { padding: 52px 0 70px; }
  .hero h1 { font-size: 43px; }
  .hero-copy > p { font-size: 17px; }
  .hero-actions { flex-direction: column; }
  .section { padding: 78px 0; }
  .section-heading { text-align: left; margin-bottom: 48px; }
  h2 { font-size: 34px; }
  .workflow-rail { grid-template-columns: 1fr; gap: 34px; padding-left: 4px; }
  .workflow-rail::before { top: 0; bottom: 0; left: 26px; right: auto; width: 2px; height: auto; }
  .workflow-rail li { padding-left: 68px; }
  .workflow-rail span { position: absolute; left: 0; }
  .privacy-band { grid-template-columns: 1fr; padding-top: 72px; padding-bottom: 72px; }
  .shield { display: none; }
  .privacy-points { display: grid; }
  .pricing-panel, .faq { padding: 30px 24px; }
  .download-band { align-items: stretch; flex-direction: column; }
  footer { grid-template-columns: 1fr; }
  footer nav { justify-content: flex-start; }
  footer > p { text-align: left; }
}