:root {
  --blue: #4d74c9;
  --blue-dark: #294a99;
  --green: #63ad51;
  --ink: #202020;
  --muted: #777;
  --line: #e5e7eb;
  --soft: #f7f9fc;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: #fff;
  font-family: Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.55;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(1180px, calc(100% - 48px)); margin: 0 auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  height: 72px;
  background: rgba(255,255,255,.97);
  border-bottom: 1px solid #f0f0f0;
  backdrop-filter: blur(12px);
}
.nav-wrap { height: 100%; display: flex; align-items: center; gap: 32px; }
.zhixin-brand { display: flex; align-items: center; padding-right: 18px; border-right: 1px solid #e5e5e5; }
.zhixin-brand img { width: 132px; height: auto; }
.brand { display: flex; align-items: center; gap: 10px; font-size: 19px; font-weight: 700; white-space: nowrap; }
.brand img { width: 164px; height: auto; }
.nav-links { display: flex; align-items: center; gap: 28px; color: #666; font-size: 15px; }
.nav-links a { transition: color .2s ease; }
.nav-links a:hover { color: var(--blue); }
.nav-actions { margin-left: auto; display: flex; align-items: center; gap: 16px; color: #666; font-size: 14px; }
.business-btn { padding: 8px 18px; color: white; background: var(--green); }
.lang { padding-left: 8px; }
.search { color: var(--blue); font-size: 21px; line-height: 1; }
.menu-btn { display: none; border: 0; background: none; font-size: 25px; padding: 0; }

.hero { min-height: 510px; padding: 58px 0 42px; background: linear-gradient(180deg, #fff 0%, #fbfcff 100%); }
.hero-grid { display: grid; grid-template-columns: .92fr 1.08fr; align-items: center; gap: 40px; }
.hero-copy h1 { margin: 0 0 16px; font-size: clamp(34px, 3.2vw, 40px); line-height: 1.18; font-weight: 500; letter-spacing: -.04em; }
.hero-copy p { margin: 8px 0; color: #4f4f4f; font-size: 17px; }
.hero-copy .lead { margin-top: 22px; font-size: 15px; font-weight: 700; }
.hero-image { width: 100%; max-height: 405px; object-fit: contain; }
.download-actions { display: flex; flex-wrap: wrap; gap: 0; margin-top: 28px; }
.download-actions a { display: inline-flex; align-items: center; gap: 10px; min-height: 48px; padding: 0 20px; border: 1px solid #dfe3ec; color: var(--blue); background: #fff; font-size: 16px; transition: .2s ease; }
.download-actions a:first-child { color: #fff; background: var(--blue); border-color: var(--blue); }
.download-actions a:hover { transform: translateY(-2px); box-shadow: 0 7px 18px rgba(50, 84, 150, .16); }
.sub-actions { display: flex; flex-wrap: wrap; gap: 24px; margin-top: 16px; color: var(--blue); font-size: 16px; }
.sub-actions a { display: inline-flex; align-items: center; gap: 7px; }
.store-badges { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 20px; }
.store-badges img { height: 42px; width: auto; }

.section { padding: 70px 0; }
.section-head { margin-bottom: 32px; }
.section-head h2 { margin: 0 0 8px; font-size: 29px; font-weight: 500; }
.section-head p { margin: 0; color: var(--muted); }
.service-grid { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.service-card { min-height: 190px; padding: 28px 24px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); transition: .2s ease; }
.service-card:hover { background: var(--soft); transform: translateY(-3px); }
.service-card h3 { margin: 13px 0 8px; font-size: 20px; font-weight: 500; }
.service-card p { margin: 0; color: var(--muted); font-size: 14px; }
.service-icon { width: 42px; height: 42px; display: grid; place-items: center; color: var(--blue); border: 1px solid #c9d3ec; border-radius: 50%; font-size: 20px; }

.partners { background: #fafbfc; }
.partner-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.partner-card { min-height: 240px; padding: 30px; background: #fff; border: 1px solid var(--line); }
.partner-card img { height: 48px; width: auto; object-fit: contain; object-position: left center; margin-bottom: 20px; }
.partner-card h3 { margin: 0 0 10px; font-size: 20px; font-weight: 500; }
.partner-card p { color: var(--muted); margin: 0 0 14px; font-size: 14px; }
.partner-card ul { padding-left: 18px; margin: 0; color: #555; font-size: 14px; }

.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.news-card { overflow: hidden; border: 1px solid var(--line); background: #fff; transition: .2s ease; }
.news-card:hover { box-shadow: 0 10px 24px rgba(0,0,0,.08); transform: translateY(-3px); }
.news-card img { width: 100%; height: 145px; object-fit: cover; }
.news-card div { padding: 18px 20px 20px; }
.news-card h3 { margin: 0 0 8px; font-size: 16px; line-height: 1.45; font-weight: 500; }
.news-card p { margin: 0; color: var(--muted); font-size: 13px; }

.awards { padding: 44px 0 130px; background: #f8f9fb; text-align: center; }
.awards img { width: 82px; margin: 0 auto 14px; }
.awards h2 { margin: 0 0 8px; font-size: 23px; font-weight: 500; }
.awards p { margin: 0; color: var(--muted); }
.site-footer { padding: 34px 0 120px; color: #777; background: #fff; border-top: 1px solid var(--line); font-size: 13px; }
.footer-grid { display: flex; justify-content: space-between; gap: 24px; }
.footer-brand { display: flex; align-items: center; gap: 10px; color: #333; font-size: 16px; font-weight: 700; }
.footer-brand img { width: 145px; }
.footer-links { display: flex; gap: 24px; flex-wrap: wrap; }
.footer-links a:hover { color: var(--blue); }
.zhixin-credit { margin-top: 18px; color: #555; line-height: 1.8; }
.zhixin-credit strong { color: #222; font-size: 15px; }

.download-banner { position: fixed; z-index: 30; left: 0; right: 0; bottom: 0; min-height: 76px; display: flex; align-items: center; background: rgba(255,255,255,.98); border: 1px solid #dfe3ec; box-shadow: 0 -8px 24px rgba(30, 45, 80, .10); }
.banner-inner { width: min(1120px, calc(100% - 48px)); margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.banner-brand { display: flex; align-items: center; gap: 10px; min-width: 210px; color: #333; font-weight: 700; }
.banner-brand img { width: 126px; }
.banner-title { margin-left: auto; font-size: 21px; font-weight: 600; }
.banner-button { min-width: 120px; padding: 12px 22px; color: #fff; background: #4a6fe0; border-radius: 24px; text-align: center; font-size: 16px; font-weight: 700; transition: .2s ease; }
.banner-button:hover { background: var(--blue-dark); transform: translateY(-1px); }

.download-page { min-height: calc(100vh - 72px); padding: 64px 0 150px; background: linear-gradient(180deg, #fff, #f7f9fd); }
.download-page .page-title { text-align: center; }
.page-title h1 { margin: 0 0 8px; font-size: 42px; font-weight: 500; }
.page-title p { margin: 0 0 42px; color: #777; }
.platform-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.platform-card { min-height: 218px; display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 26px; background: #fff; border: 1px solid #e0e4ed; box-shadow: 0 8px 20px rgba(55, 75, 120, .04); text-align: center; cursor: pointer; transition: .2s ease; }
.platform-card:hover { border-color: #99afe6; box-shadow: 0 12px 28px rgba(55, 85, 160, .14); transform: translateY(-3px); }
.platform-symbol { width: 48px; height: 48px; display: grid; place-items: center; color: var(--blue); border: 1px solid #ccd7f1; border-radius: 50%; font-size: 23px; margin-bottom: 13px; }
.platform-card h2 { margin: 0 0 3px; font-size: 21px; font-weight: 500; }
.platform-card p { margin: 0; color: #858585; font-size: 14px; }
.platform-card .platform-link { margin-top: 17px; padding: 8px 18px; color: #fff; background: var(--blue); border-radius: 18px; font-size: 14px; }
.download-note { margin: 34px auto 0; max-width: 780px; padding: 18px 22px; color: #6e7481; background: #fff; border: 1px solid #e5e8ef; text-align: center; font-size: 13px; }

@media (max-width: 900px) {
  .nav-wrap { gap: 16px; }
  .nav-links { gap: 15px; font-size: 13px; }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-image { order: -1; max-height: 270px; }
  .hero-copy { text-align: center; }
  .download-actions, .sub-actions, .store-badges { justify-content: center; }
  .service-grid { grid-template-columns: repeat(2, 1fr); }
  .partner-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .container, .banner-inner { width: min(100% - 28px, 1180px); }
  .site-header { height: 64px; }
  .nav-wrap { justify-content: space-between; }
  .menu-btn { display: block; }
  .nav-links { display: none; }
  .brand img { width: 154px; }
  .zhixin-brand { padding-right: 8px; }
  .zhixin-brand img { width: 84px; }
  .nav-actions { margin-left: 0; gap: 10px; }
  .business-btn { display: none; }
  .hero { padding-top: 26px; }
  .hero-copy h1 { font-size: 33px; }
  .hero-copy p { font-size: 14px; }
  .download-actions { display: grid; grid-template-columns: 1fr; gap: 8px; }
  .download-actions a { justify-content: center; }
  .sub-actions { gap: 15px 24px; font-size: 14px; }
  .store-badges img { height: 37px; }
  .section { padding: 48px 0; }
  .section-head h2 { font-size: 25px; }
  .service-grid { grid-template-columns: 1fr 1fr; }
  .service-card { padding: 20px 15px; min-height: 170px; }
  .service-card h3 { font-size: 17px; }
  .service-card p { font-size: 12px; }
  .news-grid { grid-template-columns: 1fr; }
  .news-card img { height: 180px; }
  .footer-grid { display: block; }
  .footer-links { margin-top: 18px; gap: 12px 20px; }
  .download-banner { min-height: 66px; }
  .banner-inner { gap: 10px; }
  .banner-brand { min-width: 0; }
  .banner-brand img { width: 116px; }
  .banner-title { margin-left: 0; font-size: 14px; white-space: nowrap; }
  .banner-button { min-width: 88px; padding: 9px 12px; font-size: 13px; }
  .download-page { padding-top: 38px; }
  .page-title h1 { font-size: 32px; }
  .platform-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .platform-card { min-height: 180px; padding: 16px 9px; }
  .platform-card h2 { font-size: 17px; }
  .platform-card p, .platform-card .platform-link { font-size: 12px; }
  .platform-card .platform-link { padding: 7px 11px; }
}