* { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --brand: #2563eb;
  --ok: #16a34a;
  --warn: #94a3b8;
  --ink: #0f172a;
  --text: #334155;
  --muted: #64748b;
  --line: #e2e8f0;
  --soft: #f1f5f9;
  --paper: #fff;
}
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }
body {
  color: var(--text);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
  line-height: 1.7;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%;  height: auto;}
.wrap { width: min(1200px, calc(100% - 40px)); margin: 0 auto; }
.nav {
  position: sticky; top: 0; z-index: 40;
  background: rgba(255,255,255,.96);
  border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; min-height: 66px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 800; }
.brand-mark {
  width: 36px; height: 36px; display: grid; place-items: center;
  border-radius: 10px; color: #fff; background: var(--brand); font-weight: 900;
}
.nav-links { display: flex; gap: 26px; font-weight: 600; font-size: 15px; }
.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: 8px 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: 72vh; padding: 56px 0 0; overflow: hidden;
  color: #fff; text-align: center;
  background: #1e3a8a url("3.webp") center/cover no-repeat;
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(15,23,42,.86), rgba(15,23,42,.55) 48%, rgba(15,23,42,.9));
}
.hero-inner { position: relative; z-index: 1; display: flex; flex-direction: column; align-items: center; }
.hero h1 { max-width: 920px; font-size: clamp(24px, 4.2vw, 40px); line-height: 1.28; }
.hero-desc { max-width: 680px; margin-top: 16px; font-size: 16px; color: rgba(255,255,255,.88); }
.hero-cta { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-top: 22px; }
.btn { min-width: 148px; height: 48px; padding: 0 20px; font-size: 15px; }
.btn-primary { color: #fff; background: var(--brand); }
.btn-ghost { color: #fff; border: 1px solid rgba(255,255,255,.5); background: rgba(255,255,255,.12); }
.btn-line { color: #fff; border: 1px solid rgba(255,255,255,.7); background: transparent; }
.compare {
  width: min(720px, 94%); margin-top: 24px; display: grid; grid-template-columns: 1fr 1fr; gap: 12px; text-align: left;
}
.col { padding: 16px; border-radius: 12px; font-size: 14px; }
.col.bad { background: rgba(148,163,184,.18); color: #e2e8f0; }
.col.good { background: rgba(37,99,235,.35); color: #fff; }
.col b { display: block; margin-bottom: 8px; font-size: 13px; }
.col.good b { color: #93c5fd; }
.hero-shot { width: min(1100px, 100%); margin-top: 32px; }
.hero-shot img { width: 100%; border-radius: 14px 14px 0 0; }
section { padding: 80px 0; }
.head { max-width: 720px; margin: 0 auto 40px; text-align: center; }
h2 { color: var(--ink); font-size: clamp(24px, 3.2vw, 34px); }
.head p, .copy p { margin-top: 12px; color: var(--muted); }
h3 { color: var(--ink); font-size: 19px; }
.gallery { background: var(--soft); }
.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: 160px; object-fit: cover; }
.card-body { padding: 16px 18px 20px; }
.card-body p { margin-top: 6px; color: var(--muted); font-size: 13px; }
.tag {
  display: inline-block; margin-top: 10px; padding: 3px 10px; border-radius: 999px;
  color: var(--brand); background: #dbeafe; font-size: 12px; font-weight: 800;
}
.more { display: block; margin-top: 28px; text-align: center; color: var(--brand); font-weight: 800; }
.zigzag { display: grid; gap: 64px; }
.row { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 48px; }
.row.reverse .media { order: 2; }
.row img { width: 100%; height: 300px; object-fit: cover; border-radius: 16px; border: 1px solid var(--line); }
.text-link { display: inline-block; margin-top: 18px; color: var(--brand); font-weight: 800; border-bottom: 1px solid var(--brand); }
.download { background: linear-gradient(180deg, #fff, var(--soft)); text-align: center; }
.cards-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 40px; text-align: left; }
.dl-card { padding: 26px 22px; 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: 48px; }
.quote { padding: 22px; border-radius: 14px; background: var(--soft); }
.quote strong { display: block; margin-top: 14px; color: var(--brand); }
.users { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; margin-bottom: 48px; }
.user { padding: 16px 12px; border-radius: 12px; border: 1px solid var(--line); text-align: center; }
.avatar {
  width: 42px; height: 42px; margin: 0 auto; display: grid; place-items: center;
  border-radius: 50%; background: #dbeafe; color: var(--brand); font-weight: 900;
}
.user b { display: block; margin: 10px 0 6px; color: var(--ink); font-size: 14px; }
.user p { color: var(--muted); font-size: 13px; }
.stars { margin-top: 8px; color: #ca8a04; font-size: 12px; }
.about {
  display: flex; align-items: center; justify-content: space-between; gap: 32px;
  padding: 32px; border-radius: 16px; background: var(--soft);
}
.pills { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.pills span { padding: 5px 12px; border-radius: 999px; background: #fff; font-size: 13px; font-weight: 700; color: var(--ink); }
.trust-nums { display: flex; gap: 28px; text-align: center; }
.trust-nums strong { display: block; color: var(--ink); font-size: 26px; }
.trust-nums span { color: var(--muted); font-size: 13px; }
footer { padding: 44px 0; background: #0f172a; color: #94a3b8; text-align: center; }
footer .name { color: #fff; font-weight: 800; margin-bottom: 14px; }
footer nav { display: flex; justify-content: center; gap: 22px; margin-bottom: 12px; }
footer a:hover { color: #fff; }
@media (max-width: 960px) {
  .nav-links { 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); }
  .hero { padding-top: 44px; min-height: 0; }
  .cards-4, .cards-3, .quotes, .users, .compare { 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); }