:root {
  --brand: #10c8c2;
  --brand-dark: #078f8b;
  --brand-soft: #e9fbf9;
  --coral: #ff5f73;
  --ink: #172231;
  --muted: #667386;
  --line: #e7edf1;
  --surface: #f7fbfb;
  --white: #ffffff;
  --shadow: 0 24px 70px rgba(21, 55, 70, .12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}
body.modal-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
img { display: block; max-width: 100%; }
.container { width: min(1120px, calc(100% - 40px)); margin-inline: auto; }

.site-header {
  position: fixed;
  z-index: 40;
  inset: 0 0 auto;
  height: 74px;
  border-bottom: 1px solid rgba(231, 237, 241, .84);
  background: rgba(255, 255, 255, .88);
  backdrop-filter: blur(18px);
  transition: height .2s ease, box-shadow .2s ease;
}
.site-header.scrolled { height: 64px; box-shadow: 0 12px 36px rgba(28, 55, 70, .08); }
.nav-wrap { height: 100%; display: flex; align-items: center; justify-content: space-between; gap: 26px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; font-size: 18px; }
.brand img { width: 44px; height: 44px; border-radius: 14px; box-shadow: 0 8px 20px rgba(16, 200, 194, .16); }
.main-nav { display: flex; align-items: center; gap: 28px; margin-left: auto; color: #526071; font-size: 14px; }
.main-nav a { padding: 26px 0; transition: color .2s ease; }
.main-nav a:hover { color: var(--brand-dark); }
.nav-download, .big-download, .download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  cursor: pointer;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.nav-download { padding: 10px 20px; border-radius: 12px; color: #fff; background: var(--ink); font-size: 14px; font-weight: 700; }
.nav-download:hover, .big-download:hover, .download-btn:hover { transform: translateY(-2px); }

.hero {
  position: relative;
  overflow: hidden;
  padding: 148px 0 90px;
  background: linear-gradient(135deg, #f0fffd 0%, #ffffff 48%, #fff5f7 100%);
}
.hero-bg { position: absolute; border-radius: 999px; filter: blur(4px); opacity: .56; pointer-events: none; }
.hero-bg-one { width: 320px; height: 320px; left: -110px; top: 110px; background: rgba(16, 200, 194, .2); }
.hero-bg-two { width: 280px; height: 280px; right: -85px; bottom: 30px; background: rgba(255, 95, 115, .18); }
.hero-grid { position: relative; display: grid; grid-template-columns: 1.04fr .96fr; align-items: center; gap: 72px; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; color: var(--brand-dark); font-size: 13px; font-weight: 800; letter-spacing: .08em; }
.eyebrow::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--coral); box-shadow: 14px 0 0 var(--brand); }
.hero h1 { margin: 18px 0 18px; font-size: clamp(42px, 6vw, 72px); line-height: 1.05; letter-spacing: -.05em; }
.hero-desc { max-width: 580px; margin: 0; color: var(--muted); font-size: 18px; line-height: 1.85; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }
.download-btn { gap: 12px; min-width: 176px; min-height: 60px; padding: 12px 22px; border-radius: 18px; color: var(--ink); background: #fff; border: 1px solid var(--line); box-shadow: 0 15px 34px rgba(21, 55, 70, .08); font-weight: 800; }
.download-btn.primary { color: #fff; border-color: transparent; background: linear-gradient(135deg, var(--ink), #2a3c4d); }
.download-btn .icon { width: 30px; height: 30px; display: grid; place-items: center; border-radius: 10px; color: #fff; background: var(--brand); font-size: 18px; }
.download-btn small { display: block; margin-bottom: 2px; font-size: 10px; font-weight: 600; opacity: .72; }
.trust-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 18px; color: #718094; font-size: 13px; }
.trust-row span { padding: 7px 11px; border: 1px solid var(--line); border-radius: 999px; background: rgba(255,255,255,.75); }
.wechat-inline { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 18px; }
.wechat-inline strong { font-size: 13px; color: var(--muted); }
.wechat-inline button { padding: 8px 12px; border: 1px solid #ccefeb; border-radius: 999px; color: var(--brand-dark); background: var(--brand-soft); cursor: pointer; font-weight: 800; }
.hero-card { position: relative; min-height: 460px; display: grid; place-items: center; }
.logo-halo { width: min(360px, 82vw); aspect-ratio: 1; display: grid; place-items: center; border-radius: 42px; background: rgba(255,255,255,.62); box-shadow: var(--shadow); backdrop-filter: blur(18px); }
.logo-halo img { width: 58%; height: 58%; object-fit: contain; border-radius: 28px; }
.live-card { position: absolute; padding: 16px 18px; border: 1px solid rgba(255,255,255,.74); border-radius: 20px; background: rgba(255,255,255,.88); box-shadow: 0 18px 42px rgba(22, 54, 72, .12); backdrop-filter: blur(16px); }
.live-card span, .live-card small { display: block; color: var(--muted); font-size: 12px; }
.live-card strong { display: block; margin: 4px 0; font-size: 30px; }
.score-card { left: 24px; bottom: 54px; }
.data-card { right: 4px; top: 70px; }

.data-strip { padding: 22px 0; border-block: 1px solid var(--line); background: #fff; }
.strip-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; text-align: center; }
.strip-grid strong { display: block; color: var(--brand-dark); font-size: 28px; }
.strip-grid span { color: var(--muted); font-size: 13px; }
.section { padding: 86px 0; }
.section-heading { max-width: 720px; margin: 0 auto 38px; text-align: center; }
.section-heading h2, .showcase-copy h2, .security h2, .service-wrap h2 { margin: 14px 0 12px; font-size: clamp(28px, 4vw, 44px); line-height: 1.18; letter-spacing: -.035em; }
.section-heading p, .showcase-copy p, .security p, .service-wrap p { margin: 0; color: var(--muted); line-height: 1.8; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature-card { min-height: 220px; padding: 28px; border: 1px solid var(--line); border-radius: 26px; background: #fff; box-shadow: 0 14px 38px rgba(22, 54, 72, .06); }
.feature-card.featured { background: linear-gradient(135deg, #10313e, #086f72); color: #fff; }
.feature-card.featured p, .feature-card.featured .feature-icon { color: rgba(255,255,255,.78); }
.feature-icon { color: var(--brand); font-size: 14px; font-weight: 900; }
.feature-card h3 { margin: 28px 0 10px; font-size: 24px; }
.feature-card p { margin: 0; color: var(--muted); line-height: 1.75; }

.showcase { padding: 86px 0; background: var(--surface); }
.showcase-grid { display: grid; grid-template-columns: .85fr 1.15fr; align-items: center; gap: 54px; }
.text-link { display: inline-flex; margin-top: 24px; color: var(--brand-dark); font-weight: 900; }
.article-image { width: 100%; padding: 14px; border: 1px solid var(--line); border-radius: 28px; background: #fff; box-shadow: var(--shadow); cursor: zoom-in; }
.article-image img { width: 100%; border-radius: 20px; object-fit: cover; }
.article-image span { display: block; margin-top: 12px; color: var(--muted); font-size: 12px; text-align: center; }
.security { background: #fff; }
.security-grid, .service-wrap { display: grid; grid-template-columns: .9fr 1.1fr; align-items: center; gap: 68px; }
.security-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.security-list article { padding: 22px; border: 1px solid var(--line); border-radius: 22px; background: var(--surface); }
.security-list strong, .security-list span { display: block; }
.security-list strong { margin-bottom: 8px; font-size: 18px; }
.security-list span { color: var(--muted); font-size: 14px; line-height: 1.7; }
.install { padding: 84px 0; background: linear-gradient(180deg, #f7fbfb, #fff); }
.steps-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.steps-grid article { padding: 28px; border-radius: 24px; background: #fff; box-shadow: 0 12px 34px rgba(22, 54, 72, .07); }
.steps-grid b { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 14px; color: #fff; background: var(--brand); }
.steps-grid h3 { margin: 20px 0 8px; }
.steps-grid p { margin: 0; color: var(--muted); line-height: 1.7; }
.download-section { padding: 0 0 86px; }
.download-panel { display: flex; align-items: center; justify-content: space-between; gap: 26px; padding: 38px; border-radius: 30px; color: #fff; background: linear-gradient(135deg, #102331, #087d7d); box-shadow: var(--shadow); }
.download-panel .eyebrow, .download-panel p { color: rgba(255,255,255,.78); }
.download-panel h2 { margin: 12px 0 10px; font-size: clamp(26px, 4vw, 42px); }
.big-download { flex: 0 0 auto; min-height: 56px; padding: 0 28px; border-radius: 16px; color: var(--ink); background: #fff; font-weight: 900; }
.service-section { padding: 82px 0; background: var(--surface); }
.wechat-list { display: grid; gap: 14px; }
.wechat-card { width: 100%; display: grid; grid-template-columns: 1fr auto auto; align-items: center; gap: 14px; padding: 18px; border: 1px solid var(--line); border-radius: 18px; background: #fff; cursor: pointer; text-align: left; transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease; }
.wechat-card:hover { transform: translateX(4px); border-color: #beeae6; box-shadow: 0 14px 34px rgba(22, 54, 72, .08); }
.wechat-card span { color: var(--muted); font-size: 13px; }
.wechat-card strong { font-size: 22px; letter-spacing: .04em; }
.wechat-card em { padding: 8px 12px; border-radius: 10px; color: var(--brand-dark); background: var(--brand-soft); font-style: normal; font-weight: 800; font-size: 12px; }
.site-footer { padding: 44px 0 24px; color: #b7c0ca; background: #131d28; }
.footer-grid { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding-bottom: 26px; }
.footer-brand { display: flex; align-items: center; gap: 12px; }
.footer-brand img { border-radius: 12px; }
.footer-brand strong, .footer-brand span { display: block; }
.footer-brand strong { color: #fff; }
.footer-brand span { margin-top: 3px; font-size: 12px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 22px; font-size: 13px; }
.footer-links a:hover { color: var(--brand); }
.footer-bottom { padding-top: 20px; border-top: 1px solid rgba(255,255,255,.08); font-size: 12px; }
.floating-service { position: fixed; z-index: 35; right: 22px; bottom: 22px; width: 58px; height: 58px; border: 0; border-radius: 18px; color: #fff; background: #19b77b; box-shadow: 0 16px 34px rgba(25, 183, 123, .28); cursor: pointer; font-weight: 900; }
.image-modal { position: fixed; z-index: 80; inset: 0; display: none; place-items: center; padding: 22px; background: rgba(9, 20, 28, .78); backdrop-filter: blur(6px); }
.image-modal.active { display: grid; }
.image-modal img { max-width: min(100%, 980px); max-height: 84vh; border-radius: 22px; box-shadow: var(--shadow); }
.image-modal-close { position: fixed; top: 20px; right: 24px; width: 42px; height: 42px; border: 0; border-radius: 50%; background: #fff; color: var(--ink); font-size: 28px; cursor: pointer; }
.toast { position: fixed; z-index: 100; left: 50%; bottom: 36px; padding: 12px 18px; border-radius: 12px; color: #fff; background: rgba(19, 29, 40, .94); font-size: 13px; transform: translate(-50%, 18px); visibility: hidden; opacity: 0; transition: .22s ease; }
.toast.show { visibility: visible; opacity: 1; transform: translate(-50%, 0); }
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .6s ease, transform .6s ease; }
.reveal.visible { opacity: 1; transform: none; }

@media (max-width: 920px) {
  .main-nav { display: none; }
  .hero { padding: 126px 0 64px; }
  .hero-grid, .showcase-grid, .security-grid, .service-wrap { grid-template-columns: 1fr; gap: 38px; }
  .hero-copy { text-align: center; }
  .hero-desc { margin-inline: auto; }
  .hero-actions, .trust-row, .wechat-inline { justify-content: center; }
  .hero-card { min-height: 360px; }
  .score-card { left: 8%; bottom: 30px; }
  .data-card { right: 6%; top: 28px; }
  .feature-grid, .steps-grid { grid-template-columns: 1fr; }
  .security-list { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .container { width: min(100% - 28px, 560px); }
  .site-header { height: 62px; }
  .site-header.scrolled { height: 58px; }
  .brand { font-size: 16px; }
  .brand img { width: 38px; height: 38px; border-radius: 12px; }
  .nav-download { padding: 9px 13px; font-size: 12px; }
  .hero { padding: 96px 0 48px; }
  .hero h1 { font-size: 38px; }
  .hero-desc { font-size: 14px; line-height: 1.72; }
  .hero-actions { gap: 10px; margin-top: 24px; }
  .download-btn { flex: 1 1 146px; min-width: 0; min-height: 52px; padding: 9px 10px; border-radius: 14px; gap: 8px; }
  .download-btn .icon { width: 25px; height: 25px; font-size: 15px; }
  .download-btn span { font-size: 13px; text-align: left; }
  .download-btn small { font-size: 9px; }
  .trust-row { gap: 8px; font-size: 11px; }
  .trust-row span { padding: 6px 9px; }
  .wechat-inline { gap: 8px; margin-top: 14px; }
  .wechat-inline button { padding: 7px 10px; font-size: 12px; }
  .hero-card { min-height: 300px; }
  .logo-halo { width: 230px; border-radius: 30px; }
  .logo-halo img { border-radius: 22px; }
  .live-card { padding: 12px 14px; border-radius: 16px; }
  .live-card strong { font-size: 22px; }
  .live-card span, .live-card small { font-size: 10px; }
  .score-card { left: 0; bottom: 20px; }
  .data-card { right: 0; top: 24px; }
  .data-strip { padding: 18px 0; }
  .strip-grid { grid-template-columns: repeat(2, 1fr); row-gap: 16px; }
  .strip-grid strong { font-size: 23px; }
  .strip-grid span { font-size: 11px; }
  .section, .showcase, .install, .service-section { padding: 64px 0; }
  .section-heading { margin-bottom: 26px; }
  .section-heading h2, .showcase-copy h2, .security h2, .service-wrap h2 { font-size: 28px; }
  .feature-card, .steps-grid article, .security-list article { padding: 22px; border-radius: 20px; }
  .feature-card h3 { margin-top: 18px; font-size: 20px; }
  .article-image { padding: 10px; border-radius: 22px; }
  .article-image img { border-radius: 16px; }
  .download-section { padding-bottom: 64px; }
  .download-panel { display: block; padding: 28px 22px; border-radius: 24px; text-align: center; }
  .big-download { width: 100%; margin-top: 20px; }
  .wechat-card { grid-template-columns: 1fr auto; padding: 15px; }
  .wechat-card span { grid-column: 1 / -1; }
  .footer-grid { align-items: flex-start; flex-direction: column; }
  .footer-links { gap: 14px 18px; }
  .floating-service { right: 14px; bottom: 14px; width: 52px; height: 52px; border-radius: 16px; font-size: 12px; }
}