:root {
  --ink: #071d49;
  --blue: #075dcc;
  --sky: #62b5ff;
  --ice: #eff7ff;
  --paper: #fbfdff;
  --line: #d9e9f8;
  --muted: #52647e;
  --green: #39d98a;
  --shadow: 0 20px 60px rgba(7, 55, 116, 0.12);
  --radius: 8px;
  --max: 1180px;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
  letter-spacing: 0;
}
a {
  color: inherit;
  text-decoration: none;
}
img {
  max-width: 100%;
  display: block;
}
button,
a {
  touch-action: manipulation;
}
.container {
  width: min(calc(100% - 40px), var(--max));
  margin: auto;
}
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(251, 253, 255, 0.88);
  border-bottom: 1px solid rgba(217, 233, 248, 0.8);
  backdrop-filter: blur(16px);
}
.nav {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 21px;
  font-weight: 800;
}
.brand img,
.title-logo {
  width: 34px;
  height: 34px;
  border-radius: 7px;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 14px;
  font-weight: 600;
}
.nav-links a:not(.btn):hover {
  color: var(--blue);
}
.nav-links a[aria-current="page"]:not(.btn) {
  color: var(--blue);
  box-shadow: inset 0 -2px var(--blue);
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  min-height: 44px;
  padding: 0 20px;
  border: 1px solid var(--ink);
  border-radius: 7px;
  font-weight: 700;
  transition: 0.2s ease;
}
.btn svg {
  width: 18px;
}
.btn-primary {
  color: #fff;
  background: var(--ink);
  box-shadow: 0 8px 24px rgba(7, 29, 73, 0.2);
}
.btn-primary:hover {
  background: var(--blue);
  border-color: var(--blue);
  transform: translateY(-2px);
}
.btn-light {
  background: #fff;
  border-color: var(--line);
}
.btn-light:hover {
  border-color: var(--sky);
  transform: translateY(-2px);
}
.menu-btn {
  display: none;
  width: 42px;
  height: 42px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 7px;
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}
.mobile-download {
  display: none;
}
.hero {
  position: relative;
  overflow: hidden;
  padding: 86px 0 72px;
  background: linear-gradient(180deg, #f5faff 0%, #fbfdff 100%);
}
.hero:before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(7, 93, 204, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(7, 93, 204, 0.045) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: linear-gradient(to bottom, #000, transparent 78%);
}
.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 70px;
  align-items: center;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 800;
}
.eyebrow:before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--blue);
}
h1 {
  margin: 0 0 24px;
  font-size: clamp(42px, 6vw, 72px);
  line-height: 1.08;
  letter-spacing: 0;
}
h1 em {
  color: var(--blue);
  font-style: normal;
}
.lead {
  max-width: 620px;
  margin: 0 0 30px;
  color: var(--muted);
  font-size: 18px;
}
.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.trust-row {
  display: flex;
  gap: 22px;
  margin-top: 24px;
  color: var(--muted);
  font-size: 13px;
}
.trust-row span {
  display: flex;
  align-items: center;
  gap: 7px;
}
.trust-row i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
}
.app-preview {
  position: relative;
  min-height: 500px;
}
.phone {
  width: 286px;
  margin: auto;
  padding: 12px;
  background: var(--ink);
  border: 1px solid #19427d;
  border-radius: 36px;
  box-shadow: 0 35px 80px rgba(5, 54, 120, 0.23);
  transform: rotate(3deg);
}
.phone-screen {
  min-height: 500px;
  padding: 25px 18px;
  background: #f8fbff;
  border-radius: 26px;
}
.phone-top {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  font-weight: 700;
}
.mini-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 30px 0 24px;
  font-weight: 800;
}
.mini-brand img {
  width: 30px;
  border-radius: 6px;
}
.note {
  padding: 16px;
  margin-bottom: 12px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 7px;
  box-shadow: 0 5px 15px rgba(15, 73, 140, 0.05);
}
.note b {
  display: block;
  font-size: 14px;
}
.note p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 11px;
}
.note.blue {
  background: #eaf5ff;
  border-color: #b8ddff;
}
.float-chip {
  position: absolute;
  padding: 12px 15px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 7px;
  box-shadow: var(--shadow);
  font-size: 13px;
  font-weight: 700;
}
.chip-a {
  left: 0;
  top: 68px;
}
.chip-b {
  right: 0;
  bottom: 80px;
}
.section {
  padding: 96px 0;
}
.section-tint {
  background: var(--ice);
}
.section-head {
  display: flex;
  justify-content: space-between;
  gap: 40px;
  align-items: end;
  margin-bottom: 42px;
}
.section-head h2,
.content-hero h1 {
  margin: 0;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.18;
}
.heading-with-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}
.section-head p {
  max-width: 480px;
  margin: 0;
  color: var(--muted);
}
.bento {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 16px;
}
.card {
  position: relative;
  overflow: hidden;
  padding: 30px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: 0.25s ease;
}
.card:hover {
  border-color: #a7d3ff;
  transform: translateY(-4px);
  box-shadow: 0 18px 40px rgba(13, 84, 158, 0.09);
}
.card h3 {
  margin: 20px 0 8px;
  font-size: 20px;
}
.card p {
  margin: 0;
  color: var(--muted);
}
.card-lg {
  grid-column: span 7;
  min-height: 300px;
}
.card-sm {
  grid-column: span 5;
}
.card-third {
  grid-column: span 4;
}
.icon-box {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  color: var(--blue);
  background: #eaf5ff;
  border: 1px solid #c8e4ff;
  border-radius: 7px;
}
.icon-box svg {
  width: 23px;
  height: 23px;
}
.paper-lines {
  position: absolute;
  right: -30px;
  bottom: -20px;
  width: 48%;
  height: 170px;
  border: 1px solid var(--line);
  background: repeating-linear-gradient(#fff 0 25px, #cfe8ff 26px 27px);
  transform: rotate(-5deg);
  border-radius: 7px;
}
.timeline {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
}
.timeline:before {
  content: "";
  position: absolute;
  top: 14px;
  left: 10%;
  right: 10%;
  height: 1px;
  background: #aad4fb;
}
.milestone {
  position: relative;
  padding: 46px 25px 0;
}
.dot {
  position: absolute;
  top: 8px;
  left: 25px;
  width: 13px;
  height: 13px;
  border: 3px solid var(--ice);
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 0 1px var(--blue);
}
.milestone time {
  color: var(--blue);
  font-size: 13px;
  font-weight: 800;
}
.milestone h3 {
  margin: 7px 0;
}
.milestone p {
  color: var(--muted);
  font-size: 14px;
}
.version-list {
  display: grid;
  gap: 12px;
}
.version-row {
  display: grid;
  grid-template-columns: 100px 1fr auto;
  gap: 20px;
  align-items: center;
  padding: 18px 22px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 7px;
}
.version-tag {
  color: var(--blue);
  font-weight: 800;
}
.version-row p {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 14px;
}
.version-row time {
  color: var(--muted);
  font-size: 13px;
}
.download-band {
  padding: 84px 0;
  color: #fff;
  background: var(--ink);
  overflow: hidden;
}
.download-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 40px;
  align-items: center;
}
.download-band h2 {
  margin: 0 0 12px;
  font-size: clamp(30px, 4vw, 48px);
}
.download-band p {
  margin: 0;
  color: #b9cae2;
}
.download-band .btn {
  color: var(--ink);
  background: #fff;
  border-color: #fff;
}
.site-footer {
  padding: 52px 0 28px;
  background: #051736;
  color: #dce9f8;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr 0.7fr;
  gap: 50px;
  padding-bottom: 40px;
}
.footer-grid p,
.footer-grid a {
  color: #9fb3cd;
  font-size: 14px;
}
.footer-links {
  display: grid;
  gap: 8px;
}
.footer-links h3 {
  margin: 0 0 10px;
  color: #fff;
  font-size: 14px;
}
.copyright {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding-top: 24px;
  border-top: 1px solid #183157;
  color: #8fa5c1;
  font-size: 13px;
}
.content-hero {
  padding: 72px 0;
  background: #f1f8ff;
  border-bottom: 1px solid var(--line);
}
.content-hero h1 {
  margin: 0 0 18px;
}
.breadcrumbs {
  margin-bottom: 20px;
  color: var(--muted);
  font-size: 13px;
}
.breadcrumbs a {
  color: var(--blue);
}
.article-layout {
  display: grid;
  grid-template-columns: 230px 1fr;
  gap: 60px;
  padding: 70px 0 90px;
}
.side-nav {
  position: sticky;
  top: 100px;
  align-self: start;
  display: grid;
  gap: 8px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #fff;
}
.side-nav a {
  padding: 8px 11px;
  color: var(--muted);
  font-size: 14px;
  border-left: 2px solid transparent;
}
.side-nav a:hover {
  color: var(--blue);
  border-left-color: var(--blue);
  background: var(--ice);
}
.prose {
  max-width: 780px;
}
.prose h2 {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 48px 0 16px;
  font-size: 28px;
  line-height: 1.3;
}
.prose h2:first-child {
  margin-top: 0;
}
.prose h2 img {
  width: 28px;
  height: 28px;
  border-radius: 6px;
}
.prose h3 {
  margin: 30px 0 10px;
}
.prose p {
  margin: 0 0 18px;
  color: #304460;
}
.prose ul {
  padding-left: 20px;
  color: #304460;
}
.info-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin: 24px 0;
}
.info-block {
  padding: 22px;
  background: var(--ice);
  border: 1px solid var(--line);
  border-radius: 7px;
}
.info-block b {
  display: block;
  margin-bottom: 6px;
}
.version-detail {
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
}
.version-detail header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 15px;
}
.version-detail h3 {
  margin: 0;
}
.version-detail time {
  color: var(--muted);
  font-size: 13px;
}
.fade-up {
  opacity: 0;
  transform: translateY(18px);
  transition: 0.65s ease;
}
.fade-up.visible {
  opacity: 1;
  transform: none;
}
.skip-link {
  position: absolute;
  left: -9999px;
}
.skip-link:focus {
  left: 10px;
  top: 10px;
  z-index: 99;
  background: #fff;
  padding: 10px;
}
@media (max-width: 820px) {
  .container {
    width: min(calc(100% - 28px), var(--max));
  }
  .nav {
    height: 64px;
  }
  .menu-btn {
    display: grid;
    place-items: center;
  }
  .mobile-download {
    display: inline-flex;
    min-width: 58px;
    height: 42px;
    padding: 0 14px;
    font-size: 13px;
  }
  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    padding: 18px 20px;
    background: #fff;
    border-bottom: 1px solid var(--line);
    box-shadow: 0 12px 20px rgba(8, 44, 89, 0.08);
  }
  .nav-links.open {
    display: grid;
  }
  .nav-links .btn {
    width: 100%;
  }
  .hero {
    padding: 54px 0;
  }
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .app-preview {
    min-height: 450px;
  }
  .phone {
    width: 250px;
  }
  .phone-screen {
    min-height: 430px;
  }
  .float-chip {
    display: none;
  }
  .section {
    padding: 70px 0;
  }
  .section-head {
    display: block;
  }
  .section-head p {
    margin-top: 14px;
  }
  .card-lg,
  .card-sm,
  .card-third {
    grid-column: span 12;
    min-height: auto;
  }
  .paper-lines {
    display: none;
  }
  .timeline {
    grid-template-columns: 1fr;
  }
  .timeline:before {
    top: 10px;
    bottom: 10px;
    left: 6px;
    right: auto;
    width: 1px;
    height: auto;
  }
  .milestone {
    padding: 0 0 32px 34px;
  }
  .dot {
    top: 6px;
    left: 0;
  }
  .version-row {
    grid-template-columns: 82px 1fr;
  }
  .version-row time {
    grid-column: 2;
  }
  .download-inner {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .footer-grid > div:first-child {
    grid-column: 1/-1;
  }
  .copyright {
    display: block;
  }
  .article-layout {
    grid-template-columns: 1fr;
    padding-top: 35px;
  }
  .side-nav {
    position: static;
    grid-template-columns: repeat(2, 1fr);
  }
  .info-grid {
    grid-template-columns: 1fr;
  }
}
@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
    transition: none !important;
  }
  .fade-up {
    opacity: 1;
    transform: none;
  }
}