* { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --brand: #1677ff;
  --brand-dark: #0d5edb;
  --ink: #1a2332;
  --text: #4b5870;
  --muted: #7a8699;
  --line: #e8eef6;
  --soft: #f5f8fc;
  --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(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: 68px;
  gap: 16px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-size: 17px;
  font-weight: 800;
  flex-shrink: 0;
}
.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;
  align-items: center;
  gap: 28px;
  color: var(--text);
  font-size: 15px;
  font-weight: 600;
}
.nav-links a:hover, .crumb a:hover { color: var(--brand); }
.nav-cta, .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  font-weight: 800;
  transition: .2s ease;
  cursor: pointer;
  border: 0;
}
.nav-cta {
  padding: 10px 20px;
  color: #fff;
  background: var(--brand);
  font-size: 14px;
}
.nav-cta:hover, .btn-primary:hover, .dl-card .btn:hover { background: var(--brand-dark); transform: translateY(-1px); }
.menu-btn {
  display: none;
  border: 0;
  background: none;
  width: 40px;
  height: 40px;
  font-size: 22px;
  cursor: pointer;
}
.mobile-panel {
  display: none;
  flex-direction: column;
  gap: 12px;
  padding: 8px 0 16px;
  border-top: 1px solid var(--line);
  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: 72px 0 0;
  overflow: hidden;
  color: #fff;
  text-align: center;
  background: #0b3f9c url("4.webp") center / cover no-repeat;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(8,32,86,.62) 0%, rgba(8,32,86,.38) 48%, rgba(8,32,86,.55) 100%);
}
.hero-inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.hero h1 {
  max-width: 920px;
  font-size: clamp(30px, 5vw, 52px);
  line-height: 1.18;
  letter-spacing: -.03em;
  text-shadow: 0 8px 24px rgba(0,0,0,.25);
}
.hero-desc {
  max-width: 680px;
  margin-top: 16px;
  font-size: 18px;
  color: rgba(255,255,255,.9);
}
.hero-note {
  margin-top: 12px;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(255,255,255,.16);
  font-size: 13px;
  font-weight: 700;
}
.hero-cta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 28px;
}
.btn {
  min-width: 148px;
  height: 50px;
  padding: 0 22px;
  font-size: 16px;
}
.btn-primary { color: #fff; background: var(--brand); }
.btn-ghost {
  color: #fff;
  border: 1px solid rgba(255,255,255,.55);
  background: rgba(255,255,255,.12);
}
.btn-line {
  color: #fff;
  border: 1px solid rgba(255,255,255,.7);
  background: transparent;
}
.hero-shot {
  width: min(1100px, 100%);
  margin-top: 48px;
  filter: drop-shadow(0 24px 40px rgba(0,0,0,.35));
}
.hero-shot img {
  width: 100%;
  border-radius: 16px 16px 0 0;
}

section { padding: 80px 0; }
.head { max-width: 720px; margin: 0 auto 40px; text-align: center; }
h2 {
  color: var(--ink);
  font-size: clamp(26px, 3.4vw, 40px);
  line-height: 1.2;
}
.head p, .copy p, .prose p { margin-top: 12px; color: var(--muted); }
h3 { color: var(--ink); font-size: 20px; }
.prose { max-width: 800px; margin: 0 auto 36px; }
.prose p { font-size: 15px; line-height: 1.9; }

.gallery { background: var(--soft); }
.cards-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.card {
  overflow: hidden;
  border-radius: 20px;
  background: var(--white);
  border: 1px solid var(--line);
}
.card img { width: 100%; height: 168px; 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: #eef5ff;
  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: 320px;
  object-fit: cover;
  border-radius: 20px;
  border: 1px solid var(--line);
}
.copy h2 { font-size: clamp(24px, 3vw, 34px); }
.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: 22px;
  margin-top: 40px;
  text-align: left;
}
.dl-card {
  padding: 28px 24px;
  border-radius: 22px;
  background: #fff;
  border: 1px solid var(--line);
}
.dl-card .kicker { color: var(--brand); font-size: 13px; font-weight: 800; letter-spacing: .08em; }
.dl-card h3 { margin-top: 8px; }
.dl-card p { margin: 8px 0 18px; color: var(--muted); font-size: 14px; }
.dl-card .btn { width: 100%; color: #fff; background: var(--brand); }

.quotes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-bottom: 56px;
}
.quote {
  padding: 24px;
  border-radius: 20px;
  background: var(--soft);
}
.quote p { color: var(--text); }
.quote strong { display: block; margin-top: 14px; color: var(--brand-dark); }

.users {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 14px;
  margin-bottom: 48px;
}
.user {
  padding: 18px 14px;
  border-radius: 16px;
  border: 1px solid var(--line);
  text-align: center;
}
.avatar {
  width: 44px;
  height: 44px;
  margin: 0 auto;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: #eef5ff;
  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: #f5b301; font-size: 12px; }

.about {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  padding: 36px;
  border-radius: 28px;
  background: var(--soft);
}
.about h3 { font-size: 24px; }
.pills { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.pills span {
  padding: 6px 12px;
  border-radius: 999px;
  background: #fff;
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
}
.trust-nums { display: flex; gap: 28px; text-align: center; flex-shrink: 0; }
.trust-nums strong { display: block; color: var(--ink); font-size: 28px; }

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 28px;
  text-align: left;
}
.step {
  padding: 22px;
  border-radius: 18px;
  background: #fff;
  border: 1px solid var(--line);
}
.step b { color: var(--brand); }

.faq { margin-top: 48px; text-align: left; }
.faq details {
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}
.faq summary { cursor: pointer; color: var(--ink); font-weight: 800; }
.faq p { margin-top: 8px; }

footer {
  padding: 40px 0 28px;
  background: #121826;
  color: #9aa6b8;
  text-align: center;
}
footer .name { color: #fff; font-size: 18px; font-weight: 800; }
footer p, footer nav { margin-top: 8px; font-size: 13px; }
footer nav { display: flex; justify-content: center; gap: 18px; }
footer a:hover { color: #fff; }

@media (max-width: 980px) {
  .nav-links, .nav-inner > .nav-cta { display: none; }
  .menu-btn { display: block; }
  .cards-4, .cards-3, .quotes, .steps { 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: 220px; margin-bottom: 20px; }
  .about { text-align: center; }
  .trust-nums { justify-content: center; margin-top: 20px; }
}
@media (max-width: 640px) {
  .wrap { width: calc(100% - 28px); }
  .hero { padding-top: 48px; min-height: 0; }
  .cards-4, .cards-3, .quotes, .users, .steps { grid-template-columns: 1fr; }
  .btn { min-width: 120px; }
}

/* 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); }