:root {
  --blue: #075bea;
  --blue-deep: #063a9b;
  --ink: #10213d;
  --muted: #62708a;
  --line: #d7e1ef;
  --surface: #f4f8fd;
  --radius: 16px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: #fff;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.6;
}
a { color: inherit; }
.nav {
  height: 72px;
  max-width: 1180px;
  margin: auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: baseline; gap: 16px; text-decoration: none; }
.brand-mark { color: var(--blue); font-size: 30px; font-weight: 900; letter-spacing: -2px; }
.brand-name { font-size: 18px; font-weight: 750; }
.nav-actions { display: flex; align-items: center; gap: 18px; }
.nav-link { color: var(--muted); text-decoration: none; font-size: 14px; }
.nav-register { padding: 8px 17px; color: #fff; background: var(--blue); border-radius: 8px; text-decoration: none; font-size: 14px; font-weight: 700; }
main { overflow: hidden; }
.hero {
  max-width: 1180px;
  min-height: 620px;
  margin: auto;
  padding: 88px 24px 64px;
  display: grid;
  grid-template-columns: 1.15fr .85fr;
  gap: 72px;
  align-items: center;
}
.eyebrow { margin: 0 0 14px; color: var(--blue); font-weight: 750; font-size: 14px; letter-spacing: .08em; }
h1 { margin: 0; font-size: clamp(42px, 5.2vw, 72px); line-height: 1.08; letter-spacing: -.055em; }
.summary { max-width: 620px; margin: 26px 0 0; color: var(--muted); font-size: 18px; }
.actions { margin-top: 34px; display: flex; flex-direction: column; align-items: flex-start; gap: 13px; }
.download {
  display: inline-flex;
  min-height: 52px;
  padding: 13px 24px;
  align-items: center;
  justify-content: center;
  color: #fff;
  background: var(--blue);
  border: 2px solid var(--blue);
  border-radius: 10px;
  font-weight: 750;
  text-decoration: none;
  box-shadow: 0 10px 28px rgba(7,91,234,.22);
  transition: transform .15s ease, background .15s ease;
}
.download:hover { background: var(--blue-deep); border-color: var(--blue-deep); }
.download:active { transform: translateY(1px); }
.download:focus-visible, .nav-link:focus-visible { outline: 3px solid rgba(7,91,234,.28); outline-offset: 4px; }
.meta { color: var(--muted); font-size: 13px; }
.text-link { color: var(--blue); font-size: 14px; font-weight: 700; text-decoration: none; }
.product-panel { padding: 26px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); box-shadow: 0 30px 80px rgba(21,59,116,.14); transform: rotate(1.5deg); }
.panel-head { display: flex; gap: 16px; align-items: center; padding-bottom: 22px; border-bottom: 1px solid var(--line); }
.panel-head img { width: 66px; height: 66px; border-radius: 14px; object-fit: cover; }
.panel-head strong, .panel-head span { display: block; }
.panel-head strong { font-size: 20px; }
.panel-head span { color: var(--muted); font-size: 14px; }
dl { margin: 8px 0 0; }
dl div { display: grid; grid-template-columns: 76px 1fr; gap: 16px; padding: 15px 0; border-bottom: 1px solid var(--line); }
dl div:last-child { border: 0; }
dt { color: var(--blue); font-weight: 800; }
dd { margin: 0; }
.trust { max-width: 1180px; margin: 0 auto; padding: 22px 24px; display: grid; grid-template-columns: 120px 1fr auto; gap: 20px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); font-size: 14px; }
.trust span { color: var(--muted); }
.trust .warning { color: #e40055; }
.features { max-width: 1180px; margin: 96px auto; padding: 0 24px; display: grid; grid-template-columns: repeat(3,1fr); gap: 48px; }
.features article { border-top: 2px solid var(--ink); padding-top: 22px; }
.features article span { color: var(--blue); font-weight: 800; }
.features h2 { margin: 28px 0 8px; font-size: 26px; }
.features p { margin: 0; color: var(--muted); }
.install { max-width: 1180px; margin: 0 auto 96px; padding: 54px; display: grid; grid-template-columns: .75fr 1.25fr; gap: 80px; background: var(--surface); border-radius: var(--radius); }
.install h2, .purchase h2 { margin: 0; font-size: 38px; letter-spacing: -.035em; }
.install ol { margin: 0; padding: 0; list-style: none; }
.install li { display: grid; grid-template-columns: 76px 1fr; gap: 18px; padding: 18px 0; border-bottom: 1px solid var(--line); }
.install li:first-child { padding-top: 0; }
.install li:last-child { border: 0; padding-bottom: 0; }
.install li b { color: var(--blue); }
.install li span { color: var(--muted); }
.access-cta { max-width: 1180px; margin: 0 auto 96px; padding: 42px 48px; display: flex; justify-content: space-between; align-items: center; gap: 32px; border: 1px solid var(--line); border-radius: var(--radius); }
.access-cta h2 { margin: 0; font-size: 32px; letter-spacing: -.035em; }
footer { max-width: 1180px; margin: auto; padding: 26px 24px 48px; display: flex; justify-content: space-between; gap: 24px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
@media (max-width: 820px) {
  .hero { min-height: auto; grid-template-columns: 1fr; gap: 48px; padding-top: 56px; }
  .product-panel { transform: none; }
  .trust { grid-template-columns: 1fr; gap: 4px; }
  .features { grid-template-columns: 1fr; gap: 38px; margin: 72px auto; }
  .install { margin: 0 16px 72px; padding: 32px 24px; grid-template-columns: 1fr; gap: 36px; }
  .access-cta { margin: 0 16px 72px; padding: 32px 24px; align-items: flex-start; flex-direction: column; }
  footer { flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}

.auth-page { min-height: 100dvh; background: var(--surface); }
.auth-shell { width: min(100% - 32px, 520px); margin: 0 auto; padding: 54px 0; }
.auth-shell > .brand { display: inline-flex; margin-bottom: 30px; }
.auth-card { padding: 38px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: 0 26px 70px rgba(21,59,116,.12); }
.auth-card h1 { font-size: 38px; letter-spacing: -.035em; }
.auth-intro { margin: 10px 0 26px; color: var(--muted); }
.auth-card form { display: grid; gap: 18px; }
.auth-card label { display: grid; gap: 7px; font-size: 14px; font-weight: 700; }
.auth-card input { width: 100%; min-height: 48px; padding: 10px 12px; color: var(--ink); background: #fff; border: 1px solid #aebdd1; border-radius: 8px; font: inherit; }
.auth-card input:focus { outline: 3px solid rgba(7,91,234,.2); border-color: var(--blue); }
.form-submit { width: 100%; margin-top: 4px; cursor: pointer; }
.form-error { margin-bottom: 18px; padding: 11px 13px; color: #a20f35; background: #fff0f4; border: 1px solid #f2b8c8; border-radius: 8px; font-size: 14px; }
.auth-switch { margin: 24px 0 0; color: var(--muted); text-align: center; font-size: 14px; }
.auth-switch a { color: var(--blue); font-weight: 700; }
.account-email { color: var(--muted); font-size: 13px; }
.nav-actions form { margin: 0; }
.logout { padding: 7px 13px; color: var(--ink); background: #fff; border: 1px solid var(--line); border-radius: 8px; cursor: pointer; }
.download-page { max-width: 980px; min-height: calc(100dvh - 150px); margin: auto; padding: 80px 24px; }
.download-page h1 { font-size: 52px; }
.download-row { margin-top: 50px; padding: 28px 30px; display: flex; justify-content: space-between; align-items: center; gap: 26px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.download-row strong, .download-row span { display: block; }
.download-row strong { font-size: 20px; }
.download-row span { margin-top: 4px; color: var(--muted); font-size: 14px; }
.download-note { margin-top: 54px; padding-top: 28px; border-top: 1px solid var(--line); }
.download-note h2 { margin: 0 0 8px; }
.download-note p { margin: 0; color: var(--muted); }
@media (max-width: 620px) {
  .brand-name { display: none; }
  .account-email { display: none; }
  .auth-card { padding: 28px 22px; }
  .download-row { align-items: flex-start; flex-direction: column; }
}