* { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --brand: #1677ff;
  --ink: #111827;
  --text: #4b5563;
  --muted: #9ca3af;
  --line: #eef2f6;
  --white: #fff;
}
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }
body {
  color: var(--text);
  background: var(--white);
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
  line-height: 1.65;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%;  height: auto;}
.wrap { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }

.nav {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(255,255,255,.92);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 800;
}
.brand-mark {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  color: #fff;
  background: var(--brand);
  font-weight: 900;
}
.nav-links { display: flex; gap: 28px; font-weight: 600; font-size: 14px; }
.nav-links a:hover { color: var(--brand); }
.nav-cta, .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  font-weight: 800;
  cursor: pointer;
  border: 0;
}
.nav-cta {
  padding: 9px 18px;
  color: #fff;
  background: var(--brand);
  font-size: 14px;
}
.menu-btn { display: none; border: 0; background: none; font-size: 22px; cursor: pointer; }
.mobile-panel { display: none; flex-direction: column; gap: 12px; padding: 0 0 16px; font-weight: 600; }
.mobile-panel.open { display: flex; }
.crumb { padding: 14px 0 0; color: var(--muted); font-size: 13px; }

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #fff;
  overflow: hidden;
  background: #0b2a66 url("4.webp") center / cover no-repeat;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(8, 24, 64, .55);
}
.hero-inner { position: relative; z-index: 1; padding: 24px; }
.hero h1 {
  max-width: 900px;
  margin: 0 auto;
  font-size: clamp(28px, 5vw, 48px);
  line-height: 1.25;
  font-weight: 900;
}
.hero .btn {
  margin-top: 32px;
  min-width: 200px;
  height: 56px;
  padding: 0 36px;
  color: #fff;
  background: var(--brand);
  font-size: 18px;
}
.hero .btn:hover { filter: brightness(1.05); }

section { padding: 72px 0; }
.head { max-width: 640px; margin: 0 auto 36px; text-align: center; }
h2 { color: var(--ink); font-size: clamp(24px, 3vw, 36px); }
.head p, .copy p, .prose p { margin-top: 12px; color: var(--muted); }
h3 { color: var(--ink); font-size: 18px; }

.gallery { background: #f8fafc; }
.cards-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.card {
  overflow: hidden;
  border-radius: 16px;
  background: #fff;
  border: 1px solid var(--line);
}
.card img { width: 100%; height: 150px; object-fit: cover; }
.card-body { padding: 16px; }
.card-body p { margin-top: 6px; font-size: 13px; color: var(--muted); }
.tag {
  display: inline-block;
  margin-top: 10px;
  color: var(--brand);
  font-size: 12px;
  font-weight: 800;
}
.more { display: block; margin-top: 24px; text-align: center; color: var(--brand); font-weight: 800; }

.zigzag { display: grid; gap: 56px; }
.row { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 40px; }
.row.reverse .media { order: 2; }
.row img {
  width: 100%;
  height: 300px;
  object-fit: cover;
  border-radius: 16px;
}
.text-link {
  display: inline-block;
  margin-top: 16px;
  color: var(--brand);
  font-weight: 800;
}

.download { text-align: center; background: #f8fafc; }
.cards-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 32px; text-align: left; }
.dl-card { padding: 28px 24px; border-radius: 16px; background: #fff; border: 1px solid var(--line); }
.dl-card .kicker { color: var(--brand); font-size: 12px; font-weight: 800; }
.dl-card p { margin: 8px 0 18px; color: var(--muted); font-size: 14px; }
.dl-card .btn {
  width: 100%;
  height: 44px;
  color: #fff;
  background: var(--brand);
}

.quotes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-bottom: 40px; }
.quote { padding: 22px; border-radius: 16px; background: #f8fafc; }
.quote strong { display: block; margin-top: 12px; color: var(--ink); }
.users { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; margin-bottom: 40px; }
.user { padding: 16px 12px; border: 1px solid var(--line); border-radius: 14px; text-align: center; }
.avatar {
  width: 40px; height: 40px; margin: 0 auto; display: grid; place-items: center;
  border-radius: 50%; background: #eef5ff; color: var(--brand); font-weight: 900;
}
.user b { display: block; margin: 8px 0 4px; color: var(--ink); font-size: 14px; }
.user p { color: var(--muted); font-size: 13px; }
.stars { margin-top: 6px; color: #f5b301; font-size: 12px; }
.about {
  display: flex; align-items: center; justify-content: space-between; gap: 28px;
  padding: 28px; border-radius: 20px; background: #f8fafc;
}
.pills { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.pills span { padding: 5px 10px; border-radius: 999px; background: #fff; font-size: 12px; font-weight: 700; color: var(--ink); }
.trust-nums { display: flex; gap: 24px; text-align: center; }
.trust-nums strong { display: block; color: var(--ink); font-size: 26px; }

.prose { max-width: 720px; margin: 0 auto 28px; }
.faq { max-width: 720px; margin: 0 auto; text-align: left; }
.faq details { padding: 14px 0; border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; color: var(--ink); font-weight: 800; }

.screen {
  min-height: calc(100vh - 64px);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #fff;
  background: #0b2a66 url("1.webp") center / cover no-repeat;
  position: relative;
}
.screen::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(8, 24, 64, .58);
}
.screen-inner { position: relative; z-index: 1; padding: 24px; }
.screen h1 { font-size: clamp(30px, 5vw, 52px); max-width: 880px; margin: 0 auto; }
.screen .btn {
  margin-top: 28px;
  min-width: 220px;
  height: 56px;
  color: #fff;
  background: var(--brand);
  font-size: 18px;
}

footer { padding: 36px 0 24px; background: #111827; color: #9ca3af; text-align: center; }
footer .name { color: #fff; font-weight: 800; }
footer p, footer nav { margin-top: 8px; font-size: 13px; }
footer nav { display: flex; justify-content: center; gap: 16px; }

@media (max-width: 980px) {
  .nav-links, .nav-inner > .nav-cta { display: none; }
  .menu-btn { display: block; }
  .cards-4, .cards-3, .quotes { grid-template-columns: 1fr 1fr; }
  .users { grid-template-columns: 1fr 1fr; }
  .row, .row.reverse .media, .about { display: block; }
  .row.reverse .media { order: 0; }
  .row img { height: 200px; margin-bottom: 16px; }
  .about { text-align: center; }
  .trust-nums { justify-content: center; margin-top: 16px; }
}
@media (max-width: 640px) {
  .wrap { width: calc(100% - 28px); }
  .cards-4, .cards-3, .quotes, .users { grid-template-columns: 1fr; }
}

/* site-perf */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}
.nav { transform: translateZ(0); }