:root {
  --ink: #0f2945;
  --ink-2: #1c4c6a;
  --teal: #169c91;
  --green: #2b9854;
  --mist: #f3f7f9;
  --line: #dce6ea;
  --muted: #647482;
  --white: #fff;
  --shadow: 0 22px 60px rgba(15, 41, 69, .12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
img { display: block; max-width: 100%; }
.shell { width: min(1160px, calc(100% - 40px)); margin: 0 auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(220, 230, 234, .75);
  background: rgba(255, 255, 255, .9);
  backdrop-filter: blur(18px);
}
.nav { height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; font-weight: 800; font-size: 22px; }
.brand img { width: 42px; height: 42px; border-radius: 11px; }
.nav-links { display: flex; align-items: center; gap: 24px; }
.nav-links a { text-decoration: none; color: #40576b; font-weight: 650; font-size: 15px; }
.language-button {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--white);
  color: var(--ink);
  padding: 10px 14px;
  font: inherit;
  font-weight: 750;
  cursor: pointer;
}

.hero {
  overflow: hidden;
  background:
    radial-gradient(circle at 92% 6%, rgba(22, 156, 145, .16), transparent 32%),
    linear-gradient(180deg, #f9fbfc 0%, #fff 100%);
  padding: 88px 0 96px;
}
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; align-items: center; gap: 72px; }
.eyebrow { color: var(--teal); text-transform: uppercase; letter-spacing: .18em; font-size: 13px; font-weight: 850; }
h1 { margin: 18px 0 22px; font-size: clamp(48px, 6.2vw, 78px); line-height: .99; letter-spacing: -.052em; }
html[lang="zh-CN"] h1 { font-size: clamp(44px, 5.45vw, 66px); line-height: 1.08; letter-spacing: -.04em; }
.hero-copy { max-width: 650px; margin: 0 0 30px; color: #52697b; font-size: 20px; line-height: 1.65; }
.button-row { display: flex; flex-wrap: wrap; gap: 12px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 22px;
  border-radius: 15px;
  text-decoration: none;
  font-weight: 800;
}
.button.primary { background: linear-gradient(135deg, var(--ink), #24667b); color: var(--white); box-shadow: 0 13px 30px rgba(15, 41, 69, .2); }
.button.secondary { border: 1px solid var(--line); background: var(--white); }
.trust-line { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 28px; color: var(--muted); font-size: 14px; font-weight: 650; }
.trust-line span::before { content: "✓"; color: var(--green); margin-right: 7px; font-weight: 900; }

.phone-stage { position: relative; min-height: 640px; display: grid; place-items: center; }
.glow { position: absolute; width: 480px; height: 480px; border-radius: 50%; background: linear-gradient(135deg, rgba(22,156,145,.22), rgba(15,41,69,.1)); filter: blur(2px); }
.phone {
  position: relative;
  width: min(330px, 78vw);
  padding: 10px;
  border: 8px solid #0a1118;
  border-radius: 48px;
  background: #0a1118;
  box-shadow: 0 35px 75px rgba(15, 41, 69, .28);
  transform: rotate(2deg);
}
.phone img { width: 100%; border-radius: 32px; }
.float-card { position: absolute; border: 1px solid rgba(255,255,255,.75); border-radius: 20px; background: rgba(255,255,255,.92); box-shadow: var(--shadow); padding: 16px 18px; backdrop-filter: blur(12px); }
.float-card.one { left: 0; top: 17%; }
.float-card.two { right: -2%; bottom: 17%; }
.float-card strong { display: block; font-size: 17px; }
.float-card small { color: var(--muted); }

section { padding: 100px 0; }
.section-heading { max-width: 730px; margin: 0 auto 50px; text-align: center; }
.section-heading h2 { margin: 12px 0 15px; font-size: clamp(34px, 4.5vw, 54px); letter-spacing: -.04em; }
.section-heading p { margin: 0; color: var(--muted); font-size: 18px; line-height: 1.65; }

.steps { background: var(--mist); }
.step-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.step-card, .feature-card {
  border: 1px solid var(--line);
  border-radius: 26px;
  background: var(--white);
  padding: 30px;
  box-shadow: 0 12px 35px rgba(15, 41, 69, .05);
}
.step-number { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 13px; color: var(--white); background: linear-gradient(135deg, var(--ink), var(--teal)); font-weight: 900; }
.step-card h3, .feature-card h3 { margin: 22px 0 10px; font-size: 21px; }
.step-card p, .feature-card p { margin: 0; color: var(--muted); line-height: 1.65; }

.screens { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; align-items: end; }
.screen-card { border-radius: 30px; padding: 16px; background: #eaf0f3; box-shadow: var(--shadow); }
.screen-card:nth-child(2) { transform: translateY(-22px); }
.screen-card img { border-radius: 22px; }
.screen-label { padding: 18px 8px 7px; text-align: center; font-weight: 800; }

.features { background: var(--ink); color: var(--white); }
.features .section-heading p { color: #bdd0da; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature-card { color: var(--ink); }
.feature-icon { font-size: 28px; }
.industries { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-top: 36px; }
.industries span { border: 1px solid rgba(255,255,255,.2); border-radius: 999px; padding: 11px 15px; color: #dcebf0; background: rgba(255,255,255,.07); font-weight: 700; }

.privacy-panel { display: grid; grid-template-columns: .8fr 1.2fr; gap: 50px; align-items: center; border-radius: 34px; padding: 50px; background: linear-gradient(135deg, #edf9f7, #f6fafb); border: 1px solid #d6ece8; }
.privacy-mark { width: 150px; height: 150px; display: grid; place-items: center; margin: auto; border-radius: 42px; color: var(--white); background: linear-gradient(135deg, var(--ink), var(--teal)); font-size: 64px; box-shadow: var(--shadow); }
.privacy-panel h2 { margin: 0 0 15px; font-size: clamp(32px, 4vw, 48px); letter-spacing: -.035em; }
.privacy-panel p { color: var(--muted); font-size: 18px; line-height: 1.7; }

.cta { text-align: center; }
.cta-box { border-radius: 34px; padding: 66px 30px; color: var(--white); background: linear-gradient(135deg, var(--ink), #1f6676); }
.cta-box h2 { margin: 0 0 15px; font-size: clamp(34px, 4.5vw, 54px); }
.cta-box p { margin: 0 auto 28px; max-width: 650px; color: #cde0e7; font-size: 18px; }
.cta-box .button { background: var(--white); color: var(--ink); }

.support-hero { padding: 85px 0 60px; text-align: center; background: var(--mist); }
.support-hero h1 { font-size: clamp(42px, 6vw, 68px); }
.support-hero p { max-width: 680px; margin: 0 auto 28px; color: var(--muted); font-size: 19px; line-height: 1.65; }
.support-grid { display: grid; grid-template-columns: .72fr 1.28fr; gap: 28px; align-items: start; }
.contact-card, .faq-list { border: 1px solid var(--line); border-radius: 28px; padding: 30px; background: var(--white); box-shadow: 0 12px 35px rgba(15, 41, 69, .05); }
.contact-card { position: sticky; top: 104px; }
.contact-card img { width: 76px; height: 76px; border-radius: 18px; }
.contact-card h2 { margin: 22px 0 10px; }
.contact-card p { color: var(--muted); line-height: 1.6; }
details { border-bottom: 1px solid var(--line); padding: 20px 0; }
details:last-child { border: 0; }
summary { cursor: pointer; font-weight: 800; font-size: 18px; }
details p { color: var(--muted); line-height: 1.65; }

footer { padding: 34px 0; border-top: 1px solid var(--line); }
.footer-row { display: flex; align-items: center; justify-content: space-between; gap: 24px; color: var(--muted); font-size: 14px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 17px; }
.footer-links a { color: var(--ink); text-decoration: none; font-weight: 650; }

@media (max-width: 900px) {
  .nav-links > a { display: none; }
  .hero { padding-top: 64px; }
  .hero-grid, .privacy-panel, .support-grid { grid-template-columns: 1fr; }
  .hero-grid { gap: 30px; }
  .hero-copy { font-size: 18px; }
  .phone-stage { min-height: 590px; }
  .step-grid, .feature-grid { grid-template-columns: 1fr; }
  .screens { gap: 12px; }
  .screen-card { padding: 8px; border-radius: 18px; }
  .screen-card img { border-radius: 14px; }
  .screen-label { font-size: 13px; }
  .contact-card { position: static; }
}

@media (max-width: 620px) {
  .shell { width: min(100% - 28px, 1160px); }
  .nav { height: 68px; }
  .brand span { display: none; }
  h1 { font-size: 47px; }
  .hero { padding: 52px 0 70px; }
  .phone-stage { min-height: 520px; }
  .phone { width: 275px; border-width: 6px; border-radius: 41px; }
  .float-card { padding: 12px 14px; }
  .float-card.one { left: -3%; }
  .float-card.two { right: -3%; }
  section { padding: 74px 0; }
  .screens { overflow-x: auto; grid-template-columns: repeat(3, 240px); padding: 22px 4px 35px; scroll-snap-type: x mandatory; }
  .screen-card { scroll-snap-align: center; }
  .screen-card:nth-child(2) { transform: none; }
  .privacy-panel { padding: 34px 22px; }
  .privacy-mark { width: 112px; height: 112px; border-radius: 32px; font-size: 48px; }
  .footer-row { align-items: flex-start; flex-direction: column; }
}

@media (prefers-reduced-motion: no-preference) {
  .phone { animation: float 5.5s ease-in-out infinite; }
  @keyframes float { 0%, 100% { transform: rotate(2deg) translateY(0); } 50% { transform: rotate(1deg) translateY(-12px); } }
}