:root {
  color-scheme: light;
  --ink: #08123f;
  --muted: #4a5d86;
  --blue: #1558ed;
  --cyan: #12a7e8;
  --green: #23c99a;
  --line: rgba(80, 120, 200, .23);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background: #f7faff;
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
}
button, a { font: inherit; }
a { color: inherit; }
.site-header {
  position: sticky;
  z-index: 30;
  top: 0;
  height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(24px, 4vw, 58px);
  border-bottom: 1px solid rgba(35, 75, 155, .14);
  background: rgba(255, 255, 255, .94);
  backdrop-filter: blur(16px);
}
.brand { display: flex; align-items: center; gap: 13px; text-decoration: none; }
.brand img { width: 48px; height: 48px; object-fit: contain; }
.brand strong { font-size: 27px; letter-spacing: 0; }
.desktop-nav { display: flex; align-items: stretch; height: 100%; gap: clamp(25px, 4vw, 56px); }
.desktop-nav a, .desktop-nav button {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 0 4px;
  border: 0;
  color: #101a46;
  background: transparent;
  font-size: 18px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
}
.desktop-nav .active { color: var(--blue); }
.desktop-nav .active::after {
  content: "";
  position: absolute;
  left: 4px;
  right: 4px;
  bottom: 15px;
  height: 3px;
  border-radius: 2px;
  background: var(--blue);
}
.desktop-nav a:hover, .desktop-nav button:hover { color: var(--blue); }
.menu-button { display: none; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 7px; background: #fff; }
.menu-button span { display: block; width: 20px; height: 2px; margin: 4px auto; background: var(--ink); }

.hero {
  min-height: 535px;
  display: grid;
  grid-template-columns: minmax(390px, .85fr) minmax(610px, 1.35fr);
  gap: 20px;
  padding: clamp(70px, 7vw, 105px) clamp(34px, 5vw, 86px) 44px;
  overflow: hidden;
  background-color: #eef4ff;
}
.hero-copy { z-index: 2; align-self: center; }
.hero-copy h1 { margin: 0; font-size: clamp(48px, 4.2vw, 72px); line-height: 1.15; letter-spacing: 0; }
.hero-copy h1 em { color: #154bea; font-style: normal; }
.hero-copy p { margin: 24px 0 32px; color: #263b70; font-size: clamp(17px, 1.25vw, 21px); line-height: 1.8; }
.download-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  min-height: 64px;
  padding: 0 28px;
  color: #fff;
  border: 1px solid #1260ef;
  border-radius: 8px;
  background: #1558ed;
  box-shadow: 0 12px 25px rgba(21, 88, 237, .26);
  font-size: 18px;
  font-weight: 700;
  text-decoration: none;
}
.download-button:hover { background: #0e45cc; transform: translateY(-1px); }
.windows-mark { font-size: 28px; line-height: 1; }
.hero-points { display: flex; flex-wrap: wrap; gap: 16px 28px; margin: 46px 0 0; padding: 0; color: #263b70; list-style: none; font-size: 15px; }
.hero-points li::before { content: "✓"; margin-right: 9px; color: var(--blue); font-weight: 900; }

.product-orbit { position: relative; min-height: 390px; align-self: center; }
.orbit-line { position: absolute; left: 8%; top: 10%; width: 84%; height: 70%; border: 2px solid rgba(72, 126, 232, .25); border-radius: 50%; transform: rotate(-5deg); }
.orbit-two { left: 18%; top: 18%; width: 64%; height: 54%; transform: rotate(8deg); }
.core-logo {
  position: absolute; z-index: 3; left: 50%; top: 46%; width: 128px; height: 128px; display: grid; place-items: center;
  border: 12px solid rgba(255,255,255,.75); border-radius: 30px; background: #fff; box-shadow: 0 20px 55px rgba(26, 69, 160, .24); transform: translate(-50%,-50%);
}
.core-logo img { width: 104px; height: 104px; object-fit: contain; }
.orbit-card {
  position: absolute; z-index: 4; width: 142px; height: 112px; display: grid; place-items: center;
  border: 1px solid rgba(91, 128, 208, .32); border-radius: 8px; background: rgba(255,255,255,.9); box-shadow: 0 12px 30px rgba(50,85,160,.15); backdrop-filter: blur(12px);
}
.orbit-card span { color: var(--blue); font-size: 35px; line-height: 1; }
.orbit-card strong { margin-top: -16px; font-size: 16px; }
.card-novel { left: 28%; top: 0; }
.card-canvas { right: 12%; top: 0; }
.card-drawing { left: 11%; top: 38%; }
.card-radar { right: 0; top: 38%; }
.card-compute { left: 30%; bottom: 22%; }
.card-skills { right: 15%; bottom: 22%; }
.capability-tags {
  position: absolute; left: 1%; right: 0; bottom: 0; display: grid; grid-template-columns: repeat(6, minmax(90px, 1fr)); gap: 10px;
}
.capability-tags span { min-height: 36px; display: grid; place-items: center; padding: 5px 8px; border: 1px solid var(--line); border-radius: 6px; color: #183886; background: rgba(255,255,255,.55); font-size: 13px; text-align: center; }

.ecosystem {
  margin: 0 clamp(24px, 3.5vw, 58px);
  display: grid;
  grid-template-columns: 250px 1fr;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 10px 30px rgba(54,89,156,.08);
}
.ecosystem-title { display: grid; place-items: center; padding: 30px; border-right: 1px solid var(--line); font-size: 20px; font-weight: 800; }
.brand-list { display: flex; align-items: center; align-content: center; flex-wrap: wrap; gap: 19px 33px; padding: 22px 28px; }
.brand-list span { color: #20283d; font-size: 14px; font-weight: 700; white-space: nowrap; }
.brand-list span:nth-child(3n+1) { color: #1658c9; }
.brand-list span:nth-child(4n+2) { color: #157b68; }

.capabilities { display: grid; grid-template-columns: repeat(5, minmax(180px, 1fr)); gap: 12px; padding: 16px clamp(24px, 3.5vw, 58px) 70px; }
.capabilities article { position: relative; min-height: 210px; overflow: hidden; padding: 28px; border: 1px solid var(--line); border-radius: 8px; background: #fff; }
.capabilities h2 { margin: 0 0 14px; font-size: 21px; }
.capabilities p { max-width: 150px; margin: 0; color: var(--muted); font-size: 14px; line-height: 1.7; }
.feature-art { position: absolute; right: 16px; bottom: 18px; width: 92px; height: 92px; display: grid; place-items: center; color: var(--blue); border: 1px solid rgba(47,111,229,.22); border-radius: 8px; background: #edf4ff; font-size: 46px; box-shadow: 0 9px 25px rgba(31,94,215,.15); }
.flow { color: #4e72dc; background: #eef0ff; }.cube { color: #137fbc; background: #ebf8fd; }.chart { color: #329c79; background: #eefbf5; }.voice { color: #8a56b8; background: #f7f0fb; }

.download-section { display: flex; align-items: center; justify-content: space-between; gap: 40px; padding: 55px clamp(28px, 7vw, 115px); color: #fff; background: #091947; }
.section-label { color: #76a7ff; font-size: 12px; font-weight: 800; }
.download-section h2 { margin: 9px 0 13px; font-size: clamp(26px, 3vw, 42px); }
.download-section p { margin: 0; color: #cbd7f2; font-size: 16px; }
.download-link { flex: 0 0 auto; background: #19a77e; border-color: #19a77e; }
.download-link:hover { background: #138563; }

.modal-backdrop { position: fixed; z-index: 100; inset: 0; display: grid; place-items: center; padding: 20px; background: rgba(5, 15, 47, .52); backdrop-filter: blur(5px); }
.modal-backdrop.hidden { display: none; }
.help-modal { position: relative; width: min(420px, 100%); padding: 42px 32px 38px; border-radius: 8px; background: #fff; box-shadow: 0 28px 90px rgba(4,15,48,.35); text-align: center; }
.modal-close { position: absolute; right: 13px; top: 11px; width: 36px; height: 36px; border: 0; border-radius: 50%; color: #5d6b8d; background: #eef3fb; font-size: 26px; cursor: pointer; }
.help-icon { width: 58px; height: 58px; display: grid; place-items: center; margin: 0 auto 18px; color: #fff; border-radius: 50%; background: var(--blue); font-size: 31px; font-weight: 800; }
.help-modal h2 { margin: 0; font-size: 25px; }.help-modal p { margin: 13px 0; color: var(--muted); }.qq-number { display: block; color: var(--blue); font-size: 28px; letter-spacing: 1px; }

@media (max-width: 1100px) {
  .hero { grid-template-columns: 1fr; padding-top: 55px; }
  .hero-copy { text-align: center; }
  .hero-copy p { margin-left: auto; margin-right: auto; }
  .hero-points { justify-content: center; }
  .product-orbit { min-height: 430px; }
  .capabilities { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .site-header { height: 66px; padding: 0 17px; }
  .brand img { width: 41px; height: 41px; }.brand strong { font-size: 21px; }
  .menu-button { display: block; }
  .desktop-nav { position: absolute; left: 14px; right: 14px; top: 70px; height: auto; display: none; padding: 10px; border: 1px solid var(--line); border-radius: 8px; background: #fff; box-shadow: 0 18px 50px rgba(7,28,78,.18); }
  .desktop-nav.open { display: grid; }
  .desktop-nav a, .desktop-nav button { min-height: 45px; padding: 0 15px; justify-content: flex-start; }
  .desktop-nav .active::after { display: none; }
  .hero { min-height: auto; grid-template-columns: 1fr; padding: 48px 18px 32px; }
  .hero-copy h1 { font-size: 43px; }.hero-copy p { font-size: 15px; }.hero-copy p br { display: none; }
  .download-button { min-height: 56px; padding: 0 20px; font-size: 16px; }
  .hero-points { margin-top: 31px; gap: 12px 19px; font-size: 13px; }
  .product-orbit { min-height: 330px; margin: 20px -52px -55px; transform: scale(.72); transform-origin: center top; }
  .orbit-card { width: 118px; height: 94px; }.orbit-card strong { font-size: 13px; }
  .card-novel { left: 19%; }.card-canvas { right: 3%; }.card-drawing { left: 0; }.card-radar { right: -7%; }.card-compute { left: 18%; }.card-skills { right: 0; }
  .capability-tags { display: none; }
  .ecosystem { grid-template-columns: 1fr; margin: 0 15px; }.ecosystem-title { padding: 20px; border-right: 0; border-bottom: 1px solid var(--line); }
  .brand-list { justify-content: center; padding: 20px; gap: 15px 23px; }
  .capabilities { grid-template-columns: 1fr; padding: 14px 15px 44px; }
  .download-section { align-items: flex-start; flex-direction: column; padding: 44px 23px; }
}