:root {
  --bg: #ffffff;
  --bg-alt: #f5f7fb;
  --text: #141a2b;
  --muted: #5b6478;
  --line: #e6e9f0;
  --brand: #3d6bff;
  --brand-2: #6a4dff;
  --radius: 16px;
  --shadow: 0 1px 2px rgba(20, 26, 43, .04), 0 8px 24px rgba(20, 26, 43, .06);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.7 -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
h1, h2, h3 { margin: 0; line-height: 1.25; letter-spacing: -.01em; }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* 导航 */
.nav {
  position: sticky; top: 0; z-index: 10;
  background: rgba(255, 255, 255, .85);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; font-size: 18px; }
.nav-links { display: flex; gap: 28px; font-size: 15px; color: var(--muted); }
.nav-links a:hover { color: var(--text); }

/* 首屏 */
.hero {
  background:
    radial-gradient(900px 420px at 85% 10%, rgba(106, 77, 255, .10), transparent 60%),
    radial-gradient(700px 400px at 10% 0%, rgba(61, 107, 255, .10), transparent 60%);
}
.hero-inner {
  display: grid; grid-template-columns: 1.1fr .9fr; align-items: center; gap: 48px;
  padding-top: 96px; padding-bottom: 96px;
}
.eyebrow { margin: 0 0 16px; color: var(--brand); font-weight: 600; font-size: 14px; letter-spacing: .04em; }
.hero h1 { font-size: clamp(34px, 5vw, 52px); font-weight: 700; }
.lead { margin: 20px 0 32px; max-width: 34em; color: var(--muted); font-size: 17px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-flex; align-items: center; height: 46px; padding: 0 22px;
  border-radius: 999px; font-weight: 600; font-size: 15px; transition: transform .15s, box-shadow .15s, background .15s;
}
.btn-primary { background: linear-gradient(135deg, var(--brand), var(--brand-2)); color: #fff; box-shadow: 0 6px 18px rgba(61, 107, 255, .3); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 10px 24px rgba(61, 107, 255, .36); }
.btn-ghost { border: 1px solid var(--line); background: #fff; }
.btn-ghost:hover { background: var(--bg-alt); }

/* 首屏右侧：产品图标环绕 logo */
.hero-art { display: flex; justify-content: center; }
.orbit { position: relative; width: 340px; height: 340px; max-width: 100%; aspect-ratio: 1; }
.orbit::before {
  content: ""; position: absolute; inset: 34px;
  border: 1px dashed rgba(61, 107, 255, .28); border-radius: 50%;
}
.orbit img {
  --angle: calc(360deg / var(--n) * var(--i) - 90deg);
  position: absolute; left: 50%; top: 50%; width: 64px; height: 64px; margin: -32px;
  border-radius: 16px; background: #fff; box-shadow: var(--shadow);
  transform: rotate(var(--angle)) translate(136px) rotate(calc(-1 * var(--angle)));
}
.orbit img.orbit-center {
  width: 104px; height: 104px; margin: -52px; border-radius: 26px; transform: none;
  box-shadow: 0 16px 40px rgba(61, 107, 255, .35);
}

/* 通用区块 */
.section { padding: 88px 0; }
.section-alt { background: var(--bg-alt); }
.section-head { margin-bottom: 28px; }
.section h2 { font-size: clamp(26px, 3.4vw, 34px); font-weight: 700; }
.section-head p { margin: 10px 0 0; color: var(--muted); }

/* 产品 */
.filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 24px; }
.filters button {
  height: 36px; padding: 0 16px; border-radius: 999px; border: 1px solid var(--line);
  background: #fff; color: var(--muted); font: inherit; font-size: 14px; cursor: pointer;
}
.filters button:hover { color: var(--text); }
.filters button[aria-selected="true"] { background: var(--text); border-color: var(--text); color: #fff; }

.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card {
  display: flex; flex-direction: column; padding: 24px;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  transition: transform .2s, box-shadow .2s, border-color .2s;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: transparent; }
.card-top { display: flex; align-items: center; gap: 14px; }
.app-icon { width: 56px; height: 56px; border-radius: 14px; flex: none; box-shadow: 0 0 0 1px var(--line); }
.card h3 { font-size: 18px; font-weight: 600; }
.tag { display: inline-block; margin-top: 6px; padding: 0 8px; border-radius: 6px; font-size: 12px; line-height: 22px; }
.tag-ai { background: #efeaff; color: #5a3fd6; }
.tag-voice { background: #e8f0ff; color: #2c5ad8; }
.tag-office { background: #e6f6ee; color: #18804b; }
.tag-tools { background: #fff1e6; color: #c15a12; }
.card-desc { flex: 1; margin: 16px 0 20px; color: var(--muted); font-size: 15px; }
.card-foot {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding-top: 16px; border-top: 1px solid var(--line); font-size: 14px;
}
.platform { color: var(--muted); }
.store-link { color: var(--brand); font-weight: 600; white-space: nowrap; }
.store-link:hover { text-decoration: underline; }

/* 关于 */
.about { display: grid; grid-template-columns: 1.2fr 1fr; gap: 56px; align-items: start; }
.about-copy p { margin: 16px 0 0; color: var(--muted); }
.values { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.values li {
  display: grid; gap: 4px; padding: 20px 22px;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
}
.values strong { font-size: 16px; }
.values span { color: var(--muted); font-size: 15px; }

/* 联系 */
.contact p { margin: 12px 0 28px; color: var(--muted); }
.contact-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin: 0; }
.contact-list div { padding: 20px 22px; border: 1px solid var(--line); border-radius: var(--radius); }
.contact-list dt { color: var(--muted); font-size: 13px; }
.contact-list dd { margin: 4px 0 0; font-weight: 600; }

/* 页脚 */
.footer { border-top: 1px solid var(--line); background: var(--bg-alt); color: var(--muted); font-size: 14px; }
.footer-inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 24px; padding-top: 28px; padding-bottom: 28px; }
.footer p { margin: 0; }
.footer a:hover { color: var(--text); text-decoration: underline; }

/* 响应式 */
@media (max-width: 960px) {
  .grid { grid-template-columns: repeat(2, 1fr); }
  .hero-inner { grid-template-columns: 1fr; padding-top: 64px; padding-bottom: 64px; }
  .hero-art { order: -1; }
  .orbit { width: 280px; height: 280px; }
  .orbit img { width: 52px; height: 52px; margin: -26px; border-radius: 13px; transform: rotate(var(--angle)) translate(110px) rotate(calc(-1 * var(--angle))); }
  .orbit img.orbit-center { width: 84px; height: 84px; margin: -42px; border-radius: 21px; }
  .about { grid-template-columns: 1fr; gap: 32px; }
}
@media (max-width: 640px) {
  .wrap { padding: 0 16px; }
  .nav-links { gap: 18px; font-size: 14px; }
  .brand span { font-size: 16px; }
  .section { padding: 64px 0; }
  .grid { grid-template-columns: 1fr; }
  .contact-list { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}