:root {
  --bg: #fbfbfd;
  --bg-elevated: #ffffff;
  --ink: #1d1d1f;
  --ink-soft: #6e6e73;
  --line: #d2d2d7;
  --blue: #0066cc;
  --blue-hover: #0077ed;
  --dark: #000000;
  --dark-elevated: #161617;
  --on-dark: #f5f5f7;
  --on-dark-soft: #a1a1a6;
  --nav-h: 48px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display",
    "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Noto Sans SC", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.47059;
  font-weight: 400;
  letter-spacing: -0.022em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 0.18em; }

/* —— Global nav (Apple-like translucent bar) —— */
.globalnav {
  position: sticky;
  top: 0;
  z-index: 9999;
  height: var(--nav-h);
  background: rgba(251, 251, 253, 0.72);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}
.globalnav-content {
  max-width: 980px;
  height: 100%;
  margin: 0 auto;
  padding: 0 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.globalnav-brand {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-decoration: none;
}
.globalnav-brand:hover { color: var(--ink); text-decoration: none; opacity: 0.8; }
.globalnav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  font-size: 12px;
  font-weight: 400;
}
.globalnav-links a {
  color: var(--ink);
  opacity: 0.88;
  text-decoration: none;
}
.globalnav-links a:hover { opacity: 1; text-decoration: none; }
.globalnav-links a.is-emphasis {
  font-weight: 600;
  opacity: 1;
}

/* —— Marketing units —— */
.unit {
  position: relative;
  overflow: hidden;
  text-align: center;
  padding: 80px 22px 100px;
}
.unit--hero {
  min-height: calc(92vh - var(--nav-h));
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background:
    radial-gradient(900px 520px at 50% 0%, rgba(0, 102, 204, 0.1), transparent 60%),
    linear-gradient(180deg, #ffffff 0%, var(--bg) 55%, #f5f5f7 100%);
  animation: fade-rise 0.9s ease both;
}
.unit--stats {
  padding: 28px 22px 40px;
  background: #f5f5f7;
  border-top: 1px solid rgba(0, 0, 0, 0.04);
  border-bottom: 1px solid rgba(0, 0, 0, 0.04);
}
.unit--light {
  background: var(--bg-elevated);
  text-align: left;
  padding: 96px 22px 110px;
}
.unit--dark {
  background: var(--dark);
  color: var(--on-dark);
  padding: 110px 22px;
  animation: fade-rise 1s 0.12s ease both;
}
.unit-copy {
  position: relative;
  z-index: 1;
  max-width: 780px;
  margin: 0 auto;
}
.unit-copy--narrow { max-width: 680px; }
.unit-copy--left {
  max-width: 820px;
  margin: 0 auto;
  text-align: left;
}

.unit-kicker {
  margin: 0 0 10px;
  font-size: 19px;
  line-height: 1.2;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--blue);
}
.unit-kicker--on-dark { color: #2997ff; }

.unit-eyebrow {
  margin: 0 0 12px;
  font-size: clamp(48px, 10vw, 96px);
  line-height: 1.05;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--ink);
}
.unit-headline {
  margin: 0;
  font-size: clamp(28px, 5.2vw, 48px);
  line-height: 1.08349;
  font-weight: 600;
  letter-spacing: -0.003em;
  color: var(--ink);
}
.unit-headline--sm {
  font-size: clamp(28px, 4.6vw, 40px);
}
.unit--dark .unit-headline--sm { color: var(--on-dark); }
.unit-subhead {
  margin: 18px auto 0;
  max-width: 640px;
  font-size: clamp(17px, 2.2vw, 21px);
  line-height: 1.381;
  font-weight: 400;
  letter-spacing: 0.011em;
  color: var(--ink-soft);
}
.unit-subhead--left {
  margin-left: 0;
  margin-right: 0;
  max-width: 720px;
}
.unit--dark .unit-subhead { color: var(--on-dark-soft); }

.unit-links {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 1.5rem 2rem;
}
.unit-links--left { justify-content: flex-start; }

.link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.2rem;
  font-size: 17px;
  font-weight: 400;
  color: var(--blue);
  text-decoration: none;
}
.link:hover { text-decoration: underline; text-underline-offset: 0.2em; color: var(--blue-hover); }
.link span { font-size: 1.15em; line-height: 1; }
.link--on-dark { color: #2997ff; }
.link--on-dark:hover { color: #6cb3ff; }

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  border-radius: 980px;
  background: var(--blue);
  color: #fff;
  font-size: 17px;
  font-weight: 400;
  text-decoration: none;
  transition: background 0.15s ease;
}
.btn-primary:hover {
  background: var(--blue-hover);
  color: #fff;
  text-decoration: none;
}

.stat-row {
  max-width: 720px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}
.stat { padding: 8px 12px; }
.stat-value {
  margin: 0;
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink);
  line-height: 1.1;
}
.stat-label {
  margin: 6px 0 0;
  font-size: 14px;
  color: var(--ink-soft);
}

.feature-list {
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}
.feature-list li {
  display: grid;
  gap: 6px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}
.feature-list strong {
  font-size: 19px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.feature-list span {
  font-size: 17px;
  line-height: 1.47059;
  color: var(--ink-soft);
}

.unit-visual {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(40px);
  opacity: 0.55;
  animation: drift 14s ease-in-out infinite alternate;
}
.orb-a {
  width: min(58vw, 520px);
  height: min(58vw, 520px);
  right: -8%;
  bottom: -12%;
  background: radial-gradient(circle at 30% 30%, #c7d8ff, #a8b5ff 45%, transparent 70%);
}
.orb-b {
  width: min(42vw, 380px);
  height: min(42vw, 380px);
  left: -6%;
  top: 18%;
  background: radial-gradient(circle at 40% 40%, #e8e8ed, #d2d2d7 50%, transparent 70%);
  animation-delay: -4s;
}

/* —— Footer —— */
.ac-footer {
  background: #f5f5f7;
  color: #6e6e73;
  font-size: 12px;
  line-height: 1.5;
  padding: 14px 0 18px;
  border-top: 1px solid var(--line);
}
.ac-footer-content {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 22px;
}
.ac-footer-line {
  margin: 0;
  color: #6e6e73;
}
.ac-footer-line + .ac-footer-line {
  margin-top: 6px;
}
.ac-footer-line a { color: #424245; }
.ac-footer-line .sep {
  margin: 0 0.35em;
  color: #d2d2d7;
}
.police {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  white-space: nowrap;
}
.police img { display: inline-block; opacity: 0.75; vertical-align: -1px; }

@keyframes fade-rise {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes drift {
  from { transform: translate3d(0, 0, 0) scale(1); }
  to { transform: translate3d(12px, -18px, 0) scale(1.04); }
}

@media (max-width: 734px) {
  .unit { padding: 56px 16px 72px; }
  .unit--light { padding: 64px 16px 80px; }
  .unit--dark { padding: 72px 16px; }
  .unit--stats { padding: 20px 16px 28px; }
  .stat-row { grid-template-columns: 1fr; gap: 0.35rem; }
  .stat { padding: 10px 0; border-bottom: 1px solid var(--line); }
  .stat:last-child { border-bottom: 0; }
  .unit-links { gap: 0.9rem 1.25rem; }
  .link, .btn-primary { font-size: 14px; }
  .btn-primary { min-height: 40px; padding: 0 18px; }
  .globalnav-links { gap: 1.1rem; }
  .feature-list strong { font-size: 17px; }
  .feature-list span { font-size: 15px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
}