:root {
  color-scheme: dark;
  --bg: #070b12;
  --bg-soft: #0a1019;
  --surface: #101722;
  --surface-strong: #151e2b;
  --text: #f7faf8;
  --muted: #8b99a9;
  --lime: #c7f36b;
  --aqua: #55dcc4;
  --green: #28d795;
  --amber: #ffbe55;
  --rose: #ff647c;
  --line: rgba(255, 255, 255, 0.09);
  --line-strong: rgba(199, 243, 107, 0.24);
  --shadow: 0 28px 80px rgba(0, 0, 0, 0.38);
  --radius-lg: 28px;
  --radius-md: 20px;
  --max: 1160px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--bg);
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--text);
  background:
    radial-gradient(circle at 84% 3%, rgba(199, 243, 107, 0.09), transparent 27rem),
    radial-gradient(circle at 8% 52%, rgba(85, 220, 196, 0.055), transparent 32rem),
    var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  content: "";
  opacity: 0.22;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.018) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: linear-gradient(to bottom, black, transparent 72%);
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 100;
  padding: 10px 14px;
  border-radius: 10px;
  color: #07100b;
  background: var(--lime);
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

.container {
  width: min(calc(100% - 40px), var(--max));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  background: rgba(7, 11, 18, 0.78);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.nav {
  display: flex;
  min-height: 76px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-size: 19px;
  font-weight: 760;
  letter-spacing: -0.02em;
}

.brand img {
  width: 36px;
  height: 36px;
}

.brand-cn {
  color: var(--lime);
}

.nav-links,
.nav-actions,
.language-switch {
  display: flex;
  align-items: center;
}

.nav-links {
  gap: 30px;
  color: #cdd5dc;
  font-size: 14px;
}

.nav-links a,
.footer-links a {
  transition: color 160ms ease;
}

.nav-links a:hover,
.footer-links a:hover {
  color: var(--lime);
}

.nav-actions {
  gap: 12px;
}

.language-switch {
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.035);
}

.language-switch button {
  min-width: 45px;
  padding: 7px 10px;
  border: 0;
  border-radius: 999px;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
}

html[data-lang="en"] [data-set-lang="en"],
html[data-lang="zh"] [data-set-lang="zh"] {
  color: #07100b;
  background: var(--lime);
  font-weight: 720;
}

.menu-button {
  display: none;
  width: 42px;
  height: 42px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--text);
  background: var(--surface);
  cursor: pointer;
}

.menu-button span {
  display: block;
  height: 2px;
  margin: 4px 0;
  border-radius: 2px;
  background: currentColor;
}

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(310px, 0.72fr);
  min-height: 720px;
  align-items: center;
  gap: clamp(48px, 8vw, 108px);
  padding-block: 84px 96px;
  overflow: hidden;
}

.hero-copy {
  position: relative;
  z-index: 2;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 22px;
  color: var(--lime);
  font-size: 13px;
  font-weight: 760;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.eyebrow::before {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 18px rgba(40, 215, 149, 0.85);
  content: "";
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 760px;
  margin-bottom: 24px;
  font-size: clamp(48px, 7.2vw, 88px);
  font-weight: 790;
  line-height: 0.99;
  letter-spacing: -0.055em;
}

.hero-lead {
  max-width: 660px;
  margin-bottom: 30px;
  color: #bac5cf;
  font-size: clamp(18px, 2vw, 21px);
  line-height: 1.65;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 28px;
}

.button {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 19px;
  border: 1px solid var(--line);
  border-radius: 15px;
  color: var(--text);
  background: var(--surface);
  font-weight: 710;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.button:hover {
  border-color: rgba(255, 255, 255, 0.18);
  transform: translateY(-2px);
}

.button-primary {
  border-color: var(--lime);
  color: #07100b;
  background: var(--lime);
}

.button-primary:hover {
  background: #d2fa7c;
}

.trust-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.trust-pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 11px;
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 999px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.025);
  font-size: 13px;
}

.trust-pill::before {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--aqua);
  content: "";
}

.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
}

.radar-orbit {
  position: absolute;
  top: 6%;
  left: 50%;
  width: min(42vw, 510px);
  aspect-ratio: 1;
  border: 1px solid rgba(199, 243, 107, 0.14);
  border-radius: 50%;
  transform: translateX(-50%);
  animation: radar-pulse 5s ease-in-out infinite;
}

.radar-orbit::before,
.radar-orbit::after {
  position: absolute;
  border: 1px solid rgba(85, 220, 196, 0.09);
  border-radius: inherit;
  content: "";
}

.radar-orbit::before {
  inset: 15%;
}

.radar-orbit::after {
  inset: 31%;
}

.phone {
  position: relative;
  z-index: 2;
  width: min(100%, 350px);
  padding: 11px;
  border: 1px solid rgba(255, 255, 255, 0.17);
  border-radius: 52px;
  background: linear-gradient(150deg, #2b3440, #080c12 32%, #1c252e 74%, #080b10);
  box-shadow: var(--shadow), 0 0 90px rgba(199, 243, 107, 0.08);
  transform: rotate(1.4deg);
}

.phone::before {
  position: absolute;
  top: 20px;
  left: 50%;
  z-index: 3;
  width: 30%;
  height: 22px;
  border-radius: 999px;
  background: #020408;
  transform: translateX(-50%);
  content: "";
}

.phone img {
  width: 100%;
  height: auto;
  border-radius: 42px;
}

.section {
  padding-block: 100px;
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(300px, 0.55fr);
  align-items: end;
  justify-content: space-between;
  gap: 48px;
  margin-bottom: 40px;
}

.section-heading h2,
.cta-panel h2,
.page-hero h1 {
  margin-bottom: 0;
  font-size: clamp(36px, 5vw, 62px);
  line-height: 1.08;
  letter-spacing: -0.045em;
}

.section-heading p {
  margin-bottom: 3px;
  color: var(--muted);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.feature-card,
.proof-card,
.policy-shell,
.support-card {
  border: 1px solid var(--line);
  background: linear-gradient(145deg, rgba(21, 30, 43, 0.92), rgba(12, 18, 28, 0.96));
  box-shadow: 0 18px 55px rgba(0, 0, 0, 0.16);
}

.feature-card {
  position: relative;
  min-height: 290px;
  padding: clamp(26px, 4vw, 40px);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.feature-card::after {
  position: absolute;
  right: -70px;
  bottom: -110px;
  width: 220px;
  height: 220px;
  border: 1px solid rgba(199, 243, 107, 0.12);
  border-radius: 50%;
  content: "";
}

.feature-index {
  margin-bottom: 46px;
  color: var(--aqua);
  font: 700 12px/1 ui-monospace, SFMono-Regular, Menlo, monospace;
  letter-spacing: 0.12em;
}

.feature-card h3 {
  margin-bottom: 10px;
  font-size: 26px;
  line-height: 1.2;
}

.feature-card p {
  max-width: 500px;
  margin-bottom: 0;
  color: var(--muted);
}

.proof-section {
  padding-block: 30px 100px;
}

.proof-card {
  display: grid;
  grid-template-columns: 0.76fr 1.24fr;
  gap: clamp(42px, 8vw, 100px);
  padding: clamp(32px, 6vw, 70px);
  border-color: var(--line-strong);
  border-radius: 34px;
  background:
    radial-gradient(circle at 8% 10%, rgba(199, 243, 107, 0.12), transparent 25rem),
    linear-gradient(145deg, rgba(21, 30, 43, 0.96), rgba(9, 14, 22, 0.98));
}

.proof-card h2 {
  margin-bottom: 18px;
  font-size: clamp(34px, 4vw, 50px);
  line-height: 1.08;
  letter-spacing: -0.04em;
}

.proof-card p,
.proof-list p {
  color: var(--muted);
}

.proof-list {
  display: grid;
  gap: 14px;
}

.proof-item {
  padding: 18px 20px;
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.028);
}

.proof-item strong {
  display: block;
  margin-bottom: 3px;
}

.proof-item p {
  margin: 0;
  font-size: 14px;
}

.cta-section {
  padding-block: 0 108px;
}

.cta-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  padding: clamp(34px, 6vw, 66px);
  border: 1px solid var(--line);
  border-radius: 34px;
  background: var(--surface);
}

.cta-panel p {
  max-width: 610px;
  margin: 14px 0 0;
  color: var(--muted);
}

.site-footer {
  padding-block: 34px 42px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

.footer-main {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  margin-bottom: 20px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.disclaimer {
  max-width: 760px;
  margin: 0;
}

.page-hero {
  padding-block: 86px 50px;
}

.page-hero h1 {
  margin: 14px 0 20px;
}

.page-hero p {
  max-width: 760px;
  color: var(--muted);
  font-size: 18px;
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  color: var(--muted);
  font-size: 14px;
}

.meta-row a {
  color: var(--aqua);
}

.policy-section,
.support-section {
  padding-bottom: 100px;
}

.policy-shell {
  padding: clamp(26px, 5vw, 58px);
  border-radius: var(--radius-lg);
}

.policy-shell h2 {
  margin: 44px 0 12px;
  padding-top: 6px;
  font-size: 25px;
  line-height: 1.25;
}

.policy-shell h2:first-child {
  margin-top: 0;
}

.policy-shell h3 {
  margin: 24px 0 8px;
  font-size: 18px;
}

.policy-shell p,
.policy-shell li {
  color: #c5ced6;
}

.policy-shell a,
.support-card a {
  color: var(--aqua);
  text-decoration: underline;
  text-decoration-color: rgba(85, 220, 196, 0.4);
  text-underline-offset: 3px;
}

.policy-shell li + li {
  margin-top: 9px;
}

.policy-note {
  margin-bottom: 30px;
  padding: 16px 18px;
  border: 1px solid rgba(85, 220, 196, 0.18);
  border-radius: 15px;
  color: #c9e7e0;
  background: rgba(85, 220, 196, 0.055);
}

.support-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.support-card {
  padding: 28px;
  border-radius: var(--radius-md);
}

.support-card h2 {
  margin-bottom: 9px;
  font-size: 22px;
}

.support-card p {
  margin-bottom: 0;
  color: var(--muted);
}

.support-card-primary {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-color: var(--line-strong);
}

.support-card-primary p {
  max-width: 650px;
}

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 14px rgba(40, 215, 149, 0.65);
}

.lang-en,
.lang-zh {
  display: none !important;
}

html[data-lang="en"] .lang-en,
html[data-lang="zh"] .lang-zh {
  display: block !important;
}

html[data-lang="en"] span.lang-en,
html[data-lang="zh"] span.lang-zh,
html[data-lang="en"] a.lang-en,
html[data-lang="zh"] a.lang-zh {
  display: inline !important;
}

@keyframes radar-pulse {
  0%, 100% { opacity: 0.45; transform: translateX(-50%) scale(0.96); }
  50% { opacity: 0.9; transform: translateX(-50%) scale(1.03); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; }
}

@media (max-width: 860px) {
  .menu-button { display: block; }
  .nav-links {
    position: absolute;
    top: 76px;
    right: 20px;
    left: 20px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: rgba(16, 23, 34, 0.98);
    box-shadow: var(--shadow);
  }
  .nav-links.is-open { display: flex; }
  .nav-links a { padding: 12px 14px; }
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-block: 68px 88px;
  }
  .hero-copy { text-align: center; }
  .hero-copy h1,
  .hero-lead { margin-inline: auto; }
  .hero-actions,
  .trust-row { justify-content: center; }
  .hero-visual { margin-top: 12px; }
  .section-heading,
  .proof-card { grid-template-columns: 1fr; }
  .section-heading { gap: 18px; }
  .cta-panel { align-items: flex-start; flex-direction: column; }
}

@media (max-width: 640px) {
  .container { width: min(calc(100% - 28px), var(--max)); }
  .nav { min-height: 68px; }
  .brand { font-size: 17px; }
  .brand img { width: 32px; height: 32px; }
  .nav-links { top: 68px; right: 14px; left: 14px; }
  .language-switch button { min-width: 40px; padding: 6px 8px; }
  h1 { font-size: clamp(43px, 14vw, 66px); }
  .hero { gap: 40px; padding-top: 58px; }
  .phone { width: min(88%, 330px); border-radius: 46px; }
  .phone img { border-radius: 37px; }
  .section { padding-block: 76px; }
  .feature-grid,
  .support-grid { grid-template-columns: 1fr; }
  .feature-card { min-height: 250px; }
  .feature-index { margin-bottom: 32px; }
  .support-card-primary { grid-column: auto; align-items: flex-start; flex-direction: column; }
  .footer-main { align-items: flex-start; flex-direction: column; }
  .page-hero { padding-block: 62px 38px; }
}