:root {
  --bg: #ffffff;
  --surface: #ffffff;
  --surface-soft: #f6f8ff;
  --surface-blue: #eef4ff;
  --text: #1f2329;
  --muted: #646a73;
  --line: #e8edf7;
  --primary: #2f73ff;
  --primary-dark: #1456e8;
  --green: #21c7a8;
  --shadow: 0 18px 46px rgba(31, 84, 190, .12);
  --container: 1240px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.65;
}
a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid rgba(47, 115, 255, .35); outline-offset: 3px; }
.container { width: min(var(--container), calc(100% - 56px)); margin: 0 auto; }
.skip-link {
  position: fixed;
  left: 16px;
  top: 16px;
  z-index: 100;
  transform: translateY(-140%);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  padding: 10px 14px;
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: blur(18px);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}
.brand img { width: 98px; height: auto; display: block; }
.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}
.top-links {
  display: flex;
  align-items: center;
  gap: 22px;
  margin-left: auto;
  margin-right: 18px;
  color: #525b69;
  font-size: 15px;
  font-weight: 760;
}
.top-links a:hover { color: var(--primary); }
.pill-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  border-radius: 999px;
  border: 1.5px solid var(--primary);
  color: var(--primary);
  font-size: 16px;
  font-weight: 800;
  white-space: nowrap;
}
.pill-button.primary {
  background: linear-gradient(135deg, #4d86ff, #2f73ff);
  color: #fff;
  box-shadow: 0 12px 28px rgba(47, 115, 255, .24);
}

.hero {
  position: relative;
  padding: 38px 0 88px;
  overflow: hidden;
}
.stage-nav {
  display: flex;
  justify-content: center;
  margin: 0 auto 70px;
}
.stage-track {
  display: inline-flex;
  align-items: center;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(255, 255, 255, .9);
  box-shadow: 0 14px 42px rgba(40, 76, 148, .11);
}
.stage-item {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  min-height: 58px;
  padding: 0 28px;
  color: #252932;
  font-size: 17px;
  font-weight: 760;
}
.stage-item.active {
  background: linear-gradient(90deg, #eef4ff, #f4f8ff);
  color: var(--primary);
}
.stage-item span {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 999px;
  background: #f0f2f6;
  color: #333842;
  font-weight: 900;
}
.stage-item.active span {
  background: #d9e6ff;
  color: var(--primary);
}

.hero-copy {
  text-align: center;
  margin: 0 auto;
}
h1 {
  margin: 0;
  font-size: clamp(46px, 5.4vw, 78px);
  line-height: 1.06;
  letter-spacing: 0;
  font-weight: 900;
}
.hero-lead {
  margin: 22px auto 8px;
  color: #232832;
  font-size: clamp(18px, 1.7vw, 22px);
  font-weight: 620;
}
.hero-meta {
  margin: 0 auto;
  color: #7a828e;
  font-size: 15px;
}
.hero-meta a {
  color: var(--primary);
  font-weight: 760;
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(220px, 290px));
  justify-content: center;
  gap: 42px;
  margin-top: 68px;
}
.device-card {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 206px;
  border: 1px solid #eef2fb;
  border-radius: 14px;
  background: #fff;
  box-shadow: 0 12px 30px rgba(45, 88, 180, .08);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.device-card:hover {
  transform: translateY(-6px);
  border-color: rgba(47, 115, 255, .28);
  box-shadow: 0 22px 54px rgba(45, 88, 180, .16);
}
.device-card svg { width: 68px; height: 68px; margin-bottom: 16px; }
.device-card strong {
  display: block;
  color: #656d78;
  font-size: 18px;
  font-weight: 850;
}
.beta {
  position: absolute;
  top: 0;
  right: 0;
  border-radius: 0 14px 0 10px;
  background: #dbe7ff;
  color: var(--primary);
  font-size: 18px;
  font-weight: 850;
  line-height: 34px;
  padding: 0 10px;
}

.section {
  padding: 76px 0;
}
.section-title {
  margin: 0 auto 42px;
  text-align: center;
  max-width: 900px;
}
.section-title h2 {
  margin: 0;
  font-size: clamp(32px, 3.5vw, 48px);
  line-height: 1.16;
  letter-spacing: 0;
}
.section-title p {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 17px;
}
.capability-grid {
  display: grid;
  grid-template-columns: 1.05fr 1fr 1fr;
  gap: 22px;
}
.capability-card {
  min-height: 230px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: linear-gradient(180deg, #fff, #f8fbff);
  box-shadow: 0 14px 38px rgba(35, 72, 150, .08);
  padding: 26px;
}
.capability-card.large {
  grid-row: span 2;
  background: linear-gradient(160deg, #eef5ff, #ffffff 64%);
}
.capability-icon {
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  border-radius: 16px;
  background: #e9f1ff;
  color: var(--primary);
  margin-bottom: 22px;
}
.capability-card h3 {
  margin: 0 0 12px;
  font-size: 23px;
}
.capability-card p {
  margin: 0;
  color: var(--muted);
}
.screen-mock {
  margin-top: 28px;
  border: 1px solid #dfe8f8;
  border-radius: 16px;
  overflow: hidden;
  background: #fff;
}
.mock-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  height: 42px;
  padding: 0 14px;
  border-bottom: 1px solid #e7edf7;
  background: #f7faff;
}
.mock-bar i {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #ff6a6a;
}
.mock-bar i:nth-child(2) { background: #ffc045; }
.mock-bar i:nth-child(3) { background: #29c46f; }
.mock-body {
  display: grid;
  grid-template-columns: 32% 1fr;
  min-height: 210px;
}
.mock-side {
  padding: 18px;
  background: #f1f6ff;
}
.mock-line {
  height: 12px;
  border-radius: 999px;
  background: #dce8ff;
  margin-bottom: 12px;
}
.mock-main {
  padding: 18px;
}
.mock-doc {
  height: 16px;
  border-radius: 999px;
  background: #edf2fa;
  margin-bottom: 13px;
}
.mock-doc:nth-child(2) { width: 78%; }
.mock-doc:nth-child(3) { width: 88%; }
.mock-doc:nth-child(4) { width: 62%; }

.solution-band {
  background: linear-gradient(180deg, #f7faff, #ffffff);
}
.solution-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.solution-card {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
  padding: 24px;
}
.solution-card h3 {
  margin: 0 0 10px;
  font-size: 20px;
}
.solution-card p {
  margin: 0;
  color: var(--muted);
}
.final-cta {
  margin: 22px auto 0;
  padding: 42px;
  border-radius: 22px;
  background: linear-gradient(135deg, #256fff, #21c7d8);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}
.final-cta h2 {
  margin: 0 0 10px;
  font-size: 32px;
}
.final-cta p {
  margin: 0;
  color: rgba(255,255,255,.86);
}
.final-cta .pill-button {
  background: #fff;
  color: var(--primary-dark);
  border-color: #fff;
}

.site-footer {
  padding: 44px 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.footer-links {
  display: flex;
  gap: 18px;
}
.footer-links a { color: #3f6fdc; font-weight: 750; }

.page-hero {
  padding: 64px 0 46px;
  background: linear-gradient(180deg, #f8fbff, #fff);
}
.breadcrumb {
  color: var(--primary);
  font-weight: 820;
  margin-bottom: 18px;
}
.page-hero h1 {
  max-width: 860px;
  font-size: clamp(40px, 4.8vw, 64px);
}
.page-hero p {
  max-width: 760px;
  color: var(--muted);
  font-size: 18px;
}
.download-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(280px, 440px));
  justify-content: center;
  gap: 24px;
}
.download-panel {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fff;
  box-shadow: var(--shadow);
  padding: 30px;
}
.download-panel svg {
  width: 58px;
  height: 58px;
}
.download-panel h2 {
  margin: 18px 0 8px;
  font-size: 28px;
}
.download-panel p {
  color: var(--muted);
  margin: 0 0 20px;
}
.article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.article-card {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
  padding: 24px;
  box-shadow: 0 12px 32px rgba(35, 72, 150, .07);
}
.article-card span {
  color: var(--primary);
  font-size: 13px;
  font-weight: 900;
}
.article-card h2 {
  margin: 12px 0 10px;
  font-size: 22px;
  line-height: 1.28;
}
.article-card p {
  margin: 0;
  color: var(--muted);
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}
.related-item {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: linear-gradient(180deg, #fff, #f8fbff);
  padding: 24px;
}
.related-item strong {
  display: block;
  margin-bottom: 8px;
  font-size: 21px;
}
.related-item p {
  margin: 0;
  color: var(--muted);
}

@media (max-width: 1100px) {
  .download-grid { gap: 22px; }
  .capability-grid { grid-template-columns: 1fr 1fr; }
  .solution-grid, .article-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 820px) {
  .container { width: min(var(--container), calc(100% - 32px)); }
  .header-inner { min-height: 72px; }
  .brand img { width: 98px; }
  .top-links { display: none; }
  .header-actions { gap: 8px; }
  .pill-button { min-height: 44px; padding: 0 16px; font-size: 15px; }
  .hero { padding: 36px 0 72px; }
  .stage-nav { justify-content: flex-start; overflow-x: auto; margin-bottom: 54px; padding-bottom: 8px; }
  .stage-track { min-width: max-content; }
  .stage-item { min-height: 56px; padding: 0 18px; font-size: 16px; }
  .stage-item span { width: 30px; height: 30px; }
  .hero-lead { font-size: 18px; }
  .hero-meta { font-size: 14px; }
  .download-grid { grid-template-columns: 1fr 1fr; margin-top: 52px; }
  .device-card { min-height: 188px; }
  .device-card svg { width: 62px; height: 62px; }
  .capability-grid, .solution-grid, .article-grid, .related-grid, .download-list { grid-template-columns: 1fr; }
  .final-cta { flex-direction: column; align-items: flex-start; padding: 32px; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 520px) {
  .header-actions .pill-button:first-child { display: none; }
  h1 { font-size: 46px; }
  .download-grid { grid-template-columns: 1fr; }
  .section { padding: 64px 0; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
  }
}