:root {
  --brand: #1f4fd8;
  --brand-dark: #173aa3;
  --ink: #16202e;
  --muted: #5b6676;
  --line: #e4e8ef;
  --bg: #ffffff;
  --bg-alt: #f5f7fb;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.7 -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { line-height: 1.3; margin: 0; }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 20px; }
.narrow { max-width: 760px; }

/* 顶栏 */
.top {
  position: sticky; top: 0; z-index: 10;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.bar { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; color: var(--ink); }
.brand:hover { text-decoration: none; }
.mark {
  display: grid; place-items: center;
  width: 32px; height: 32px; border-radius: 8px;
  background: var(--brand); color: #fff; font-size: 17px;
}
.nav { display: flex; gap: 28px; }
.nav a { color: var(--muted); font-size: 15px; }
.nav a:hover { color: var(--ink); text-decoration: none; }

/* 首屏 */
.hero {
  padding: 96px 0 104px;
  background: linear-gradient(160deg, #eef3ff 0%, #ffffff 60%);
  border-bottom: 1px solid var(--line);
}
.eyebrow { margin: 0 0 14px; color: var(--brand); font-weight: 600; letter-spacing: .04em; }
.hero h1 { font-size: 44px; letter-spacing: -.01em; }
.lead { max-width: 640px; margin: 22px 0 34px; color: var(--muted); font-size: 18px; }
.cta { display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 12px 24px; border-radius: 10px;
  font-weight: 600; font-size: 16px; transition: background .15s, border-color .15s;
}
.btn:hover { text-decoration: none; }
.primary { background: var(--brand); color: #fff; }
.primary:hover { background: var(--brand-dark); }
.ghost { border: 1px solid var(--line); color: var(--ink); background: #fff; }
.ghost:hover { border-color: #c9d0dc; }

/* 通用区块 */
.section { padding: 84px 0; }
.alt { background: var(--bg-alt); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section h2 { font-size: 30px; margin-bottom: 10px; }
.sub { margin: 0 0 36px; color: var(--muted); }
.section p { color: var(--muted); }

/* 产品 */
.products { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.product {
  display: flex; flex-direction: column;
  padding: 28px; border: 1px solid var(--line); border-radius: 16px; background: #fff;
  transition: box-shadow .15s, transform .15s;
}
.product:hover { box-shadow: 0 10px 30px rgba(22, 32, 46, .08); transform: translateY(-2px); }
.head { display: flex; align-items: center; gap: 16px; margin-bottom: 14px; }
.icon { width: 64px; height: 64px; border-radius: 15px; flex: none; box-shadow: 0 2px 8px rgba(0, 0, 0, .08); }
.icon-ticiqi {
  display: block;
  background: #141138 url(img/ticiqi-fg.png) center / 150% no-repeat;
}
.product h3 { font-size: 20px; }
.product h3 a { color: var(--ink); }
.product h3 a:hover { color: var(--brand); text-decoration: none; }
.platforms { margin: 4px 0 0; font-size: 13px; color: var(--muted); }
.desc { margin: 0 0 12px; }
.product ul { margin: 0 0 6px; padding-left: 20px; color: var(--ink); font-size: 15px; }
.product li { margin: 4px 0; }
.more { margin-top: auto; padding-top: 10px; font-weight: 600; font-size: 15px; }

/* 优势、联系 */
.grid4, .grid3 { display: grid; gap: 22px; margin-top: 32px; }
.grid4 { grid-template-columns: repeat(4, 1fr); }
.grid3 { grid-template-columns: repeat(3, 1fr); }
.cell { padding: 24px; border-radius: 14px; background: #fff; border: 1px solid var(--line); }
.cell h3 { font-size: 18px; margin-bottom: 8px; }
.cell p { margin: 0; }

/* 页脚 */
.foot { padding: 30px 0; text-align: center; font-size: 14px; color: var(--muted); }
.foot p { margin: 4px 0; }
.foot a { color: var(--muted); }

@media (max-width: 900px) {
  .grid4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .nav { gap: 16px; }
  .nav a { font-size: 14px; }
  .hero { padding: 64px 0 72px; }
  .hero h1 { font-size: 30px; }
  .lead { font-size: 16px; }
  .section { padding: 60px 0; }
  .section h2 { font-size: 24px; }
  .products, .grid3, .grid4 { grid-template-columns: 1fr; }
  .product { padding: 22px; }
}
@media (max-width: 420px) {
  .nav a:nth-child(2) { display: none; }
}