:root {
  --ink: #17243e;
  --muted: #6d7890;
  --blue: #2878f0;
  --blue-deep: #1557d4;
  --line: #e8edf7;
  --surface: #fff;
  --soft: #f5f9ff;
  --radius: 22px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--surface);
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
.container { width: min(1180px, calc(100% - 48px)); margin: 0 auto; }
.site-header {
  position: absolute;
  z-index: 10;
  inset: 0 0 auto;
  padding: 26px 0;
}
.nav-wrap { display: flex; align-items: center; justify-content: space-between; }
.brand img { display: block; width: 155px; height: auto; }
.nav-download { color: #567092; font-size: 14px; font-weight: 600; transition: color .2s; }
.nav-download span { color: var(--blue); font-size: 17px; margin-left: 5px; }
.nav-download:hover { color: var(--blue); }

.hero { min-height: 735px; padding: 145px 0 80px; background: linear-gradient(130deg, #f8fbff 0%, #f2f7ff 52%, #eaf3ff 100%); position: relative; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: .88fr 1.12fr; align-items: center; gap: 34px; position: relative; z-index: 1; }
.hero-copy { padding-bottom: 24px; }
.eyebrow { display: flex; align-items: center; gap: 9px; margin: 0 0 18px; color: var(--blue); font-size: 13px; letter-spacing: .16em; font-weight: 700; }
.eyebrow-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--blue); box-shadow: 0 0 0 5px rgba(40,120,240,.12); }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 25px; font-size: clamp(48px, 5.4vw, 76px); line-height: 1.12; letter-spacing: -.045em; font-weight: 750; }
h1 em, h2 em { color: var(--blue); font-style: normal; }
.hero-lead { max-width: 440px; margin-bottom: 33px; color: var(--muted); font-size: 17px; line-height: 1.9; }
.primary-button { display: inline-flex; align-items: center; gap: 24px; padding: 16px 21px 16px 26px; border-radius: 10px; color: #fff; background: linear-gradient(105deg, var(--blue) 0%, #438ef6 100%); box-shadow: 0 13px 27px rgba(40,120,240,.24); font-size: 15px; font-weight: 700; transition: transform .2s, box-shadow .2s; }
.primary-button span { font-size: 21px; line-height: 0; }
.primary-button:hover { transform: translateY(-2px); box-shadow: 0 17px 32px rgba(40,120,240,.3); }
.hero-note { margin: 14px 0 0 4px; color: #93a0b5; font-size: 12px; }
.hero-visual { position: relative; min-height: 425px; display: flex; align-items: center; justify-content: center; }
.hero-visual img { position: relative; z-index: 2; display: block; width: min(700px, 119%); height: auto; filter: drop-shadow(0 32px 38px rgba(42,77,139,.19)); }
.visual-backdrop { position: absolute; width: 82%; height: 75%; border-radius: 48% 52% 48% 52%; background: radial-gradient(ellipse, rgba(107,173,255,.28), rgba(107,173,255,0) 68%); }
.float-pill { position: absolute; z-index: 3; padding: 9px 14px; border: 1px solid rgba(255,255,255,.75); border-radius: 99px; color: #3e639d; background: rgba(255,255,255,.75); box-shadow: 0 10px 24px rgba(71,122,198,.14); backdrop-filter: blur(8px); font-size: 12px; font-weight: 700; }
.float-pill-one { top: 7%; right: 4%; }
.float-pill-two { bottom: 13%; left: 3%; }
.hero-glow { position: absolute; border-radius: 50%; filter: blur(1px); opacity: .45; }
.hero-glow-left { width: 240px; height: 240px; left: -150px; top: 390px; background: #d9eaff; }
.hero-glow-right { width: 300px; height: 300px; right: -180px; top: 74px; background: #dceaff; }
.scroll-cue { position: absolute; bottom: 23px; left: 50%; display: flex; align-items: center; gap: 10px; color: #8ea1bf; font-size: 11px; transform: translateX(-50%); }
.scroll-cue span { width: 18px; height: 28px; border: 1px solid #9bb0cf; border-radius: 12px; position: relative; }
.scroll-cue span:after { content: ""; position: absolute; width: 3px; height: 6px; left: 7px; top: 5px; border-radius: 4px; background: var(--blue); animation: scroll 1.5s infinite; }
@keyframes scroll { 0%,100% { transform: translateY(0); opacity: .4; } 50% { transform: translateY(7px); opacity: 1; } }

.section { padding: 120px 0; }
.section-heading { text-align: center; max-width: 580px; margin: 0 auto 58px; }
.section-heading .eyebrow { justify-content: center; }
h2 { margin-bottom: 15px; font-size: clamp(31px, 4vw, 46px); line-height: 1.25; letter-spacing: -.035em; }
.section-heading > p:last-child { color: var(--muted); font-size: 15px; line-height: 1.8; }
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 17px; }
.feature-card { min-height: 270px; padding: 28px 25px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; box-shadow: 0 13px 38px rgba(31,71,131,.05); transition: transform .2s, box-shadow .2s; }
.feature-card:hover { transform: translateY(-6px); box-shadow: 0 20px 42px rgba(31,71,131,.11); }
.feature-icon { width: 78px; height: 78px; margin-bottom: 24px; border-radius: 21px; background: #f1f6ff; display: grid; place-items: center; }
.feature-icon img { width: 69px; height: 69px; object-fit: contain; }
.feature-card h3 { margin-bottom: 11px; font-size: 19px; }
.feature-card p { margin-bottom: 0; color: var(--muted); font-size: 13px; line-height: 1.8; }

.sdk-section { background: var(--soft); overflow: hidden; }
.sdk-grid { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 110px; }
.sdk-copy { max-width: 470px; }
.sdk-copy > p:not(.eyebrow) { margin-bottom: 28px; color: var(--muted); line-height: 1.9; font-size: 15px; }
.text-link { color: var(--blue); font-size: 14px; font-weight: 700; }
.text-link span { margin-left: 8px; font-size: 19px; }
.sdk-art { min-height: 330px; position: relative; display: grid; place-items: center; }
.sdk-orbit { position: absolute; border: 1px solid #cbdcf7; border-radius: 50%; transform: rotate(-25deg); }
.orbit-one { width: 355px; height: 180px; }
.orbit-two { width: 270px; height: 290px; transform: rotate(47deg); border-color: #deebfd; }
.sdk-code { width: 174px; height: 174px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 13px; border-radius: 35px; background: #fff; box-shadow: 0 22px 55px rgba(54,101,170,.16); color: var(--blue); font-family: ui-monospace, SFMono-Regular, Consolas, monospace; }
.sdk-code span { position: absolute; width: 6px; height: 6px; border-radius: 50%; background: #b3cff9; }
.sdk-code span:nth-child(1) { margin-top: -123px; margin-left: 105px; }.sdk-code span:nth-child(2) { margin-top: 124px; margin-left: -102px; background: #6ca6fa; }.sdk-code span:nth-child(3) { margin-top: -68px; margin-left: -180px; background: #9ec4fb; }
.sdk-code b { font-size: 19px; font-weight: 700; }
.sdk-node { position: absolute; padding: 8px 13px; border: 1px solid #d9e7fb; border-radius: 8px; color: #7090bd; background: rgba(255,255,255,.8); font-size: 11px; box-shadow: 0 8px 18px rgba(70,112,173,.09); }
.node-one { top: 12px; left: 15%; }.node-two { right: 6%; top: 48%; }.node-three { bottom: 13px; left: 26%; }

.site-footer { padding: 28px 0; border-top: 1px solid var(--line); background: #fff; }.footer-wrap { display: flex; align-items: center; gap: 25px; }.footer-wrap > img { width: 108px; height: auto; opacity: .82; }.footer-meta { display: flex; align-items: center; gap: 15px; color: #9aa4b5; font-size: 11px; }.footer-divider { width: 1px; height: 12px; background: #dbe1eb; }.footer-links { margin-left: auto; color: var(--blue); font-size: 12px; }

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }.hero-copy { text-align: center; }.hero-copy .eyebrow { justify-content: center; }.hero-lead { margin-left: auto; margin-right: auto; }.hero-note { margin-left: 0; }.hero-visual { min-height: 360px; }.hero-visual img { width: min(680px, 100%); }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }.sdk-grid { gap: 35px; }
}
@media (max-width: 600px) {
  .container { width: min(100% - 34px, 480px); }.site-header { padding: 20px 0; }.brand img { width: 132px; }.nav-download { font-size: 12px; }.hero { min-height: 680px; padding-top: 118px; }.hero h1 { font-size: 48px; }.hero-lead { font-size: 14px; line-height: 1.8; }.hero-visual { min-height: 245px; margin-top: 5px; }.float-pill { font-size: 10px; padding: 7px 10px; }.section { padding: 78px 0; }.section-heading { margin-bottom: 37px; }.feature-grid { grid-template-columns: 1fr 1fr; gap: 10px; }.feature-card { min-height: 235px; padding: 19px 15px; border-radius: 15px; }.feature-icon { width: 62px; height: 62px; margin-bottom: 17px; border-radius: 16px; }.feature-icon img { width: 57px; height: 57px; }.feature-card h3 { font-size: 16px; }.feature-card p { font-size: 12px; line-height: 1.65; }.sdk-grid { grid-template-columns: 1fr; }.sdk-art { min-height: 265px; order: 2; }.sdk-copy { order: 1; }.sdk-code { width: 140px; height: 140px; border-radius: 28px; }.sdk-code b { font-size: 16px; }.orbit-one { width: 285px; height: 148px; }.orbit-two { width: 220px; height: 240px; }.footer-wrap { flex-wrap: wrap; gap: 13px 18px; }.footer-links { width: 100%; margin-left: 0; }.footer-meta { gap: 9px; font-size: 10px; }
}