:root {
  --primary: #5367e8;
  --violet: #7a5af0;
  --cyan: #29cfe0;
  --success: #2aa876;
  --ink: #10162f;
  --bg: #f4f6fc;
  --surface: #ffffff;
  --border: #e4e8f3;
  --muted: #5b647c;
  --dark: #0d1224;
  --radius-card: 22px;
  --radius-btn: 16px;
  --wrap: 1120px;
}

* { box-sizing: border-box; }
html, body { margin: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(880px 420px at 82% -8%, rgba(83, 103, 232, 0.16), transparent 62%),
    radial-gradient(640px 360px at -8% 18%, rgba(41, 207, 224, 0.1), transparent 58%),
    var(--bg);
  line-height: 1.6;
  overflow-x: hidden;
}
body.nav-open { overflow: hidden; }
a { color: var(--primary); text-decoration: none; }
img { max-width: 100%; display: block; }
button, a, .btn { touch-action: manipulation; }
:focus-visible { outline: 2px solid var(--primary); outline-offset: 3px; }
.wrap {
  width: min(var(--wrap), calc(100% - 40px));
  margin: 0 auto;
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(244, 246, 252, 0.86);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(228, 232, 243, 0.9);
  padding-top: env(safe-area-inset-top);
}
.nav {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 64px;
  position: relative;
}
.nav-backdrop {
  display: none;
}
body.nav-open .nav-backdrop {
  display: block;
  position: fixed;
  inset: 0;
  z-index: 15;
  background: rgba(16, 22, 47, 0.38);
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 800;
  font-size: 18px;
  min-height: 44px;
}
.nav-panel {
  display: flex;
  align-items: center;
  gap: 22px;
  margin-left: auto;
}
.brand img {
  width: 36px;
  height: 36px;
  border-radius: 12px;
  box-shadow: 0 0 0 1px rgba(16, 22, 47, 0.08);
}
.nav-links { display: flex; gap: 22px; align-items: center; }
.nav-links a { color: var(--muted); font-weight: 650; }
.nav-links a:hover, .nav-links a.is-active { color: var(--ink); }
@media (min-width: 760px) {
  .nav-links a.is-active { box-shadow: inset 0 -2px 0 var(--primary); }
}
.nav .nav-download { display: none; }
.menu-btn {
  display: none;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 12px;
  width: 44px;
  height: 44px;
  margin-left: auto;
  padding: 0;
  cursor: pointer;
}
.menu-bars,
.menu-bars::before,
.menu-bars::after {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--ink);
  position: relative;
}
.menu-bars::before,
.menu-bars::after {
  content: "";
  position: absolute;
  left: 0;
}
.menu-bars::before { top: -6px; }
.menu-bars::after { top: 6px; }
.nav.is-open .menu-bars { background: transparent; }
.nav.is-open .menu-bars::before { top: 0; transform: rotate(45deg); }
.nav.is-open .menu-bars::after { top: 0; transform: rotate(-45deg); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 20px;
  border-radius: var(--radius-btn);
  font-weight: 700;
  font-size: 15px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}
.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 8px 18px rgba(83, 103, 232, 0.28);
}
.btn-primary:hover { background: #4458d6; }
.btn-ghost { background: var(--surface); color: var(--ink); border-color: var(--border); }
.btn-ghost:hover { background: #f7f8fd; border-color: #d5dbeb; }
.btn[aria-disabled="true"], .btn.is-disabled {
  pointer-events: none;
  color: var(--muted);
  background: #f3f5fb;
  border-color: var(--border);
  box-shadow: none;
}
.btn:active { transform: translateY(1px); }

.hero {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: center;
  padding: 72px 0 28px;
}
.kicker {
  color: var(--primary);
  font-weight: 700;
  letter-spacing: 0.04em;
  font-size: 13px;
  margin: 0 0 12px;
}
h1, h2, h3 { line-height: 1.2; margin: 0 0 12px; }
h1 { font-size: 52px; font-weight: 900; letter-spacing: -0.03em; }
h2 { font-size: 28px; font-weight: 800; }
.lede { font-size: 18px; color: var(--muted); max-width: 34em; margin-top: 0; text-wrap: pretty; }
.cta-row { display: flex; flex-wrap: wrap; gap: 10px; margin: 24px 0 16px; }
.badges { display: flex; flex-wrap: wrap; gap: 8px; color: var(--muted); font-size: 13px; }
.badge {
  background: #eef1ff;
  border: 1px solid var(--border);
  border-radius: 99px;
  padding: 6px 12px;
  font-weight: 650;
}

.hero .store-row { margin-top: 8px; }
.shot {
  margin: 0;
  justify-self: end;
}
.shot img {
  width: min(280px, 100%);
  height: auto;
  border-radius: 28px;
  box-shadow: 0 22px 48px rgba(16, 22, 47, 0.16);
}
.shot figcaption {
  margin-top: 10px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  text-align: center;
}
.gallery {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 280px));
  gap: 28px;
  justify-content: start;
}
.gallery .shot { justify-self: stretch; }
.gallery .shot img { width: 100%; }

.section { padding: 44px 0 8px; }
.section > h2 { margin-bottom: 18px; }
.stack { display: grid; gap: 12px; max-width: 720px; }
.grid-4, .grid-3, .grid-2 {
  display: grid;
  gap: 16px;
}
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: 1fr 1fr; }
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 22px;
  box-shadow: 0 8px 24px rgba(52, 68, 122, 0.06);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
@media (hover: hover) {
  .grid-4 .card:hover,
  .grid-3 .card:hover,
  .grid-2 .card:hover,
  .stack .card:hover {
    transform: translateY(-3px);
    box-shadow: 0 16px 36px rgba(52, 68, 122, 0.1);
  }
}
.card h3 { font-size: 18px; }
.card p { margin: 0; color: var(--muted); text-wrap: pretty; }
.icon-dot {
  width: 36px;
  height: 36px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: linear-gradient(180deg, #f4f6ff, #e4e9ff);
  color: var(--primary);
  font-weight: 800;
  margin-bottom: 14px;
}

.download-bar {
  margin: 52px 0 8px;
  padding: 32px;
  background:
    linear-gradient(135deg, #eef1ff 0%, #ffffff 48%);
  border-color: #d9def8;
}
.download-bar h2 { margin-bottom: 8px; }
.store-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.note { color: var(--muted); font-size: 13px; margin-top: 12px; }

.site-footer {
  margin-top: 56px;
  background: var(--dark);
  color: #c9d0e6;
  padding: 40px 0 28px;
}
.site-footer a { color: #dfe4fb; }
.site-footer a:hover { color: #fff; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 24px;
}
.site-footer h4 { color: #fff; margin: 0 0 10px; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin: 6px 0; }
.site-footer li a { display: inline-flex; align-items: center; }
.copy { border-top: 1px solid #2a3554; margin-top: 24px; padding-top: 16px; font-size: 13px; overflow-wrap: anywhere; }

.page-hero { padding: 56px 0 8px; }
.page-hero h1 { font-size: 40px; }
.prose { max-width: 720px; }
.prose p, .prose li { color: var(--muted); }
.prose ol { margin: 0; padding-left: 1.25em; }
.prose li + li { margin-top: 10px; }
.app-hero .badges { margin: 12px 0 16px; }
.legal { padding-bottom: 40px; }
.legal h2 { margin-top: 28px; font-size: 20px; }

.app-hero {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 20px;
  align-items: center;
}
.app-hero img { width: 96px; height: 96px; border-radius: 22px; }

@media (max-width: 980px) {
  h1 { font-size: 40px; }
  .grid-4, .grid-3 { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero { gap: 32px; padding: 48px 0 20px; }
}

@media (prefers-reduced-motion: reduce) {
  .card, .btn { transition: none; }
}

@media (max-width: 759px) {
  h1, .page-hero h1 { font-size: 34px; }
  h2 { font-size: 24px; }
  .lede { font-size: 16px; }
  .wrap { width: min(var(--wrap), calc(100% - 32px)); }
  .hero, .grid-4, .grid-3, .grid-2, .footer-grid {
    grid-template-columns: 1fr;
  }
  .hero { padding: 20px 0 4px; gap: 20px; }
  .page-hero { padding: 24px 0 4px; }
  .section { padding: 28px 0 4px; }
  .card { padding: 16px; }
  .download-bar { margin: 20px 0; padding: 20px 16px; }
  .shot { justify-self: center; }
  .shot img { width: min(260px, 100%); margin: 0 auto; }
  .gallery {
    display: flex;
    gap: 12px;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    padding-bottom: 6px;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior-x: contain;
  }
  .gallery .shot {
    flex: 0 0 78%;
    scroll-snap-align: center;
  }
  .cta-row, .store-row { flex-direction: column; align-items: stretch; }
  .cta-row .btn, .store-row .btn, .page-hero .btn, .app-hero .btn { width: 100%; }
  .nav .nav-download {
    display: inline-flex;
    margin-left: auto;
    min-height: 44px;
    padding: 0 14px;
    font-size: 15px;
    box-shadow: none;
  }
  .menu-btn { margin-left: 8px; }
  .site-footer {
    margin-top: 36px;
    padding: 28px 0 calc(20px + env(safe-area-inset-bottom));
  }
  .footer-grid { gap: 20px; }
  .site-footer li { margin: 0; }
  .site-footer li a { min-height: 44px; }
  .menu-btn { display: inline-flex; align-items: center; justify-content: center; }
  .nav-panel { display: none; }
  .nav.is-open .nav-panel {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    position: absolute;
    left: 0;
    right: 0;
    top: calc(100% + 8px);
    margin: 0;
    padding: 8px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 18px;
    box-shadow: 0 16px 40px rgba(16, 22, 47, 0.14);
  }
  .nav.is-open .nav-links {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }
  .nav.is-open .nav-links a {
    display: flex;
    align-items: center;
    min-height: 48px;
    padding: 0 12px;
    border-radius: 12px;
    font-size: 16px;
  }
  .nav.is-open .nav-links a.is-active,
  .nav.is-open .nav-links a:active {
    background: #eef1ff;
  }
  .nav.is-open .nav-cta { width: 100%; margin-top: 4px; }
}