:root {
  --bg: #0b1220;
  --bg2: #0f1a31;
  --card: rgba(255, 255, 255, 0.06);
  --card2: rgba(255, 255, 255, 0.08);
  --text: rgba(255, 255, 255, 0.92);
  --muted: rgba(255, 255, 255, 0.7);
  --muted2: rgba(255, 255, 255, 0.55);
  --line: rgba(255, 255, 255, 0.12);
  --primary: #3aa0ff;
  --primary2: #2b7bd0;
  --danger: #ff5a5a;
  --radius: 18px;
  --shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family:
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    "PingFang SC",
    "Hiragino Sans GB",
    "Microsoft YaHei",
    "Noto Sans CJK SC",
    Arial,
    sans-serif;
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 20% 10%, rgba(58, 160, 255, 0.24), transparent 60%),
    radial-gradient(1000px 540px at 80% 5%, rgba(255, 90, 90, 0.18), transparent 55%),
    linear-gradient(180deg, var(--bg), #070b14 60%, #060912);
}

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

.container {
  width: min(1100px, calc(100% - 40px));
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: rgba(6, 9, 18, 0.6);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  gap: 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 160px;
}

.brand-logo {
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}

.brand-text {
  font-weight: 650;
  letter-spacing: 0.4px;
}

.nav {
  display: flex;
  gap: 18px;
}

.nav-link {
  color: var(--muted);
  font-size: 14px;
  padding: 8px 10px;
  border-radius: 12px;
}

.nav-link:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
}

.nav-cta {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 10px;
  min-width: 160px;
}

.lang-toggle {
  height: 40px;
  padding: 0 12px;
  border-radius: 12px;
  font-weight: 700;
  letter-spacing: 0.2px;
}

.hero {
  padding: 56px 0 28px;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 28px;
  align-items: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.06);
  color: var(--muted);
  font-size: 13px;
}

.hero-title {
  margin: 16px 0 10px;
  font-size: 52px;
  line-height: 1.03;
  letter-spacing: -0.6px;
}

.hero-subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.7;
  max-width: 52ch;
}

.hero-actions {
  display: flex;
  gap: 12px;
  margin-top: 22px;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  padding: 0 16px;
  border-radius: 14px;
  font-weight: 620;
  font-size: 14px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  cursor: pointer;
  user-select: none;
}

.button-primary {
  background: linear-gradient(180deg, var(--primary), var(--primary2));
  border-color: rgba(0, 0, 0, 0.22);
  color: #071024;
  box-shadow: 0 14px 28px rgba(58, 160, 255, 0.18);
}

.button-primary:hover {
  filter: brightness(1.03);
}

.button-ghost {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
}

.button-ghost:hover {
  background: rgba(255, 255, 255, 0.09);
}

.hero-meta {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 22px;
}

.meta-item {
  padding: 12px 12px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.meta-k {
  font-size: 12px;
  color: var(--muted2);
}

.meta-v {
  margin-top: 6px;
  font-size: 13px;
  color: var(--text);
}

.device-card {
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.04));
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.device-card-top {
  padding: 20px 18px 16px;
  display: grid;
  justify-items: center;
  gap: 8px;
}

.device-logo {
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.28);
}

.device-title {
  font-weight: 700;
  letter-spacing: 0.3px;
}

.device-desc {
  color: var(--muted);
  font-size: 13px;
}

.device-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  padding: 0 18px 18px;
}

.tile {
  padding: 14px 14px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.tile-k {
  color: var(--muted2);
  font-size: 12px;
}

.tile-v {
  margin-top: 6px;
  font-weight: 650;
  font-size: 14px;
}

.device-card-bottom {
  padding: 12px 18px 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--muted2);
  font-size: 12px;
}

.section {
  padding: 52px 0;
}

.section-alt {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.01));
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.section-title {
  margin: 0;
  font-size: 30px;
  letter-spacing: -0.2px;
}

.section-subtitle {
  margin: 10px 0 22px;
  color: var(--muted);
  max-width: 70ch;
  line-height: 1.7;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.card {
  padding: 16px 16px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.card-title {
  font-weight: 700;
  margin-bottom: 8px;
}

.card-text {
  color: var(--muted);
  line-height: 1.65;
  font-size: 14px;
}

.steps {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 18px;
}

.step {
  display: flex;
  gap: 14px;
  padding: 16px 16px;
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.04);
}

.step-num {
  flex: 0 0 auto;
  width: 40px;
  height: 40px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: rgba(58, 160, 255, 0.16);
  border: 1px solid rgba(58, 160, 255, 0.24);
  color: rgba(255, 255, 255, 0.88);
  font-weight: 750;
}

.step-title {
  font-weight: 700;
  margin-bottom: 6px;
}

.step-text {
  color: var(--muted);
  line-height: 1.65;
  font-size: 14px;
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 18px;
}

.download-card {
  padding: 16px 16px;
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.05);
}

.download-title {
  font-weight: 750;
  margin-bottom: 8px;
}

.download-text {
  color: var(--muted);
  line-height: 1.65;
  font-size: 14px;
}

.download-actions {
  display: flex;
  gap: 10px;
  margin-top: 14px;
  flex-wrap: wrap;
}

.note {
  margin-top: 16px;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.03);
  color: var(--muted2);
  font-size: 13px;
  line-height: 1.6;
}

.faq {
  margin-top: 18px;
  display: grid;
  gap: 10px;
}

.faq-item {
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.04);
  padding: 12px 14px;
}

.faq-item summary {
  cursor: pointer;
  font-weight: 650;
}

.faq-body {
  margin-top: 10px;
  color: var(--muted);
  line-height: 1.65;
  font-size: 14px;
}

.footer {
  padding: 26px 0 34px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(6, 9, 18, 0.5);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
}

.footer-logo {
  border-radius: 6px;
}

.footer-sub {
  margin-top: 6px;
  color: var(--muted2);
  font-size: 13px;
}

.footer-sep {
  margin: 0 6px;
  opacity: 0.6;
}

.footer-sub .linklike {
  font-size: 13px;
  color: var(--muted2);
}

.footer-sub .linklike:hover {
  color: var(--text);
}

.footer-right {
  display: flex;
  gap: 14px;
  align-items: center;
}

.linklike {
  background: none;
  border: none;
  padding: 0;
  color: var(--muted);
  font-size: 14px;
  cursor: pointer;
}

.linklike:hover {
  color: var(--text);
}

.dialog {
  width: min(560px, calc(100% - 32px));
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 18px;
  background: rgba(10, 16, 30, 0.92);
  color: var(--text);
  box-shadow: var(--shadow);
  padding: 0;
}

.dialog::backdrop {
  background: rgba(0, 0, 0, 0.6);
}

.dialog-body {
  padding: 18px 18px 16px;
}

.dialog-title {
  font-weight: 750;
  margin-bottom: 8px;
}

.dialog-text {
  color: var(--muted);
  line-height: 1.65;
  font-size: 14px;
}

.dialog-actions {
  margin-top: 14px;
  display: flex;
  justify-content: flex-end;
}

.legal {
  padding: 56px 0 18px;
}

.legal-card {
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: 22px 20px;
}

.legal-title {
  margin: 0 0 10px;
  font-size: 32px;
  letter-spacing: -0.2px;
}

.legal-meta {
  color: var(--muted2);
  font-size: 13px;
  line-height: 1.7;
}

.legal-body {
  margin-top: 16px;
  color: var(--muted);
  line-height: 1.85;
  font-size: 14px;
}

.legal-body h3 {
  margin: 18px 0 8px;
  color: var(--text);
  font-size: 16px;
}

.legal-body ul {
  margin: 8px 0 8px 18px;
  padding: 0;
}

.legal-body li {
  margin: 6px 0;
}

@media (max-width: 980px) {
  .hero-inner {
    grid-template-columns: 1fr;
  }
  .nav {
    display: none;
  }
  .nav-cta {
    min-width: auto;
  }
  .hero-title {
    font-size: 44px;
  }
  .hero-meta {
    grid-template-columns: 1fr;
  }
  .cards {
    grid-template-columns: 1fr;
  }
  .steps {
    grid-template-columns: 1fr;
  }
  .download-grid {
    grid-template-columns: 1fr;
  }
}