:root {
  --ink: #061a3d;
  --ink-soft: #536783;
  --blue: #168af2;
  --blue-strong: #0c68df;
  --teal: #35c9b3;
  --line: #dce6f1;
  --line-soft: #eaf0f6;
  --surface: #ffffff;
  --surface-soft: #f5f8fc;
  --surface-blue: #edf5ff;
  --dark: #071a36;
  --container: 1236px;
  --font: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--surface);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img, svg { display: block; }
.container { width: min(var(--container), calc(100% - 56px)); margin: 0 auto; }
.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 100;
  padding: 8px 12px;
  color: #fff;
  background: var(--ink);
  transform: translateY(-150%);
}
.skip-link:focus { transform: translateY(0); }

.product-section {
  position: relative;
  overflow: hidden;
  padding: 28px 0 92px;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(circle at 87% 9%, rgba(53, 201, 179, .1), transparent 22%),
    linear-gradient(180deg, #eef5ff 0, #f8fbff 270px, #fff 540px);
}
.product-inner { position: relative; z-index: 2; }
.list-masthead {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand { display: inline-flex; align-items: center; }
.brand img { width: 150px; height: auto; }
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 14px;
  color: #425774;
  border: 1px solid #cfddeb;
  border-radius: 999px;
  background: rgba(255, 255, 255, .72);
  font-size: 13px;
  font-weight: 650;
  transition: color .2s ease, border-color .2s ease, transform .2s ease;
}
.back-link:hover { color: var(--blue-strong); border-color: #9fb9d7; transform: translateY(-1px); }
.product-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; margin-top: 42px; }
.product-card {
  position: relative;
  min-height: 318px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255,255,255,.94);
  transition: border-color .25s ease, transform .25s ease, box-shadow .25s ease;
}
.product-card::after {
  content: "";
  position: absolute;
  width: 190px;
  height: 190px;
  right: -98px;
  bottom: -104px;
  border: 1px solid #e3edf7;
  border-radius: 50%;
  pointer-events: none;
}
.product-card:hover { border-color: #b9cde2; transform: translateY(-3px); box-shadow: 0 18px 44px rgba(20, 48, 84, .08); }
.card-icon {
  display: grid;
  place-items: center;
  width: 58px;
  height: 58px;
  color: var(--blue);
  border: 1px solid #d8e8fa;
  border-radius: 14px;
  background: var(--surface-blue);
}
.card-icon.teal { color: #1cae99; border-color: #d3eee9; background: #effaf8; }
.card-icon svg { width: 30px; height: 30px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.product-kicker { display: block; margin-top: 24px; color: var(--blue-strong); font-size: 12px; font-weight: 700; }
.product-card h2 { margin: 5px 0 10px; font-size: 28px; line-height: 1.25; letter-spacing: -.025em; }
.product-card p { margin: 0; color: var(--ink-soft); font-size: 14px; line-height: 1.72; }
.product-card.knowledge {
  color: #fff;
  border-color: #17365d;
  background:
    radial-gradient(circle at 88% 15%, rgba(53, 201, 179, .18), transparent 30%),
    linear-gradient(145deg, #071a36 0%, #09264b 100%);
  box-shadow: 0 20px 48px rgba(7, 26, 54, .14);
}
.product-card.knowledge::before {
  content: "";
  position: absolute;
  top: 0;
  left: 28px;
  width: 76px;
  height: 3px;
  background: linear-gradient(90deg, var(--blue), var(--teal));
}
.product-card.knowledge::after { border-color: rgba(89, 154, 218, .18); }
.knowledge .card-icon { color: #79dccc; border-color: #274a72; background: #102f54; }
.knowledge .product-kicker { color: #7bb5f8; }
.knowledge p { color: #b9c8da; }
.card-action { display: inline-flex; align-items: center; gap: 10px; margin-top: auto; padding-top: 20px; color: #fff; font-size: 13px; font-weight: 720; }
.card-action b { color: #54d2c0; font-size: 17px; transition: transform .2s ease; }
.knowledge:hover .card-action b { transform: translateX(4px); }
.orbit { position: absolute; z-index: 1; border: 1px solid rgba(22, 138, 242, .09); border-radius: 50%; pointer-events: none; }
.orbit-one { width: 580px; height: 580px; top: -350px; right: -90px; }
.orbit-two { width: 350px; height: 350px; top: -235px; right: 26px; border-color: rgba(53, 201, 179, .12); }

.foundation-strip { color: #fff; background: var(--dark); }
.foundation-inner { min-height: 152px; display: flex; align-items: center; justify-content: space-between; gap: 40px; }
.foundation-inner > div { display: flex; align-items: center; gap: 22px; }
.foundation-mark { display: grid; place-items: center; width: 60px; height: 60px; border: 1px solid #2e4a6d; border-radius: 15px; color: #fff; background: linear-gradient(145deg, #12345c, #0b2342); font: 800 18px/1 "SFMono-Regular", Consolas, monospace; }
.foundation-inner strong { font-size: 19px; }
.foundation-inner p { margin: 4px 0 0; color: #9fb1c6; font-size: 13px; }
.foundation-inner > a { flex: 0 0 auto; color: #9cc8fb; font-size: 14px; font-weight: 700; }
.foundation-inner > a span { margin-left: 6px; color: #58d5c3; }

.site-footer { padding: 58px 0 25px; border-top: 1px solid var(--line); background: #fff; }
.footer-inner { display: flex; align-items: flex-start; justify-content: space-between; gap: 40px; padding-bottom: 40px; }
.footer-brand img { width: 150px; height: auto; }
.footer-brand p { margin: 14px 0 1px; color: #708198; font-size: 12px; }
.footer-brand strong { font-size: 14px; }
.footer-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 28px; padding-top: 9px; color: #4f627d; font-size: 13px; }
.footer-links a:hover { color: var(--blue-strong); }
.footer-bottom { display: flex; justify-content: space-between; gap: 24px; padding-top: 20px; border-top: 1px solid var(--line-soft); color: #8998aa; font-size: 11px; }

@media (max-width: 900px) {
  .product-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 620px) {
  .container { width: min(100% - 36px, var(--container)); }
  .product-section { padding: 16px 0 58px; }
  .list-masthead { min-height: 56px; }
  .brand img { width: 126px; }
  .back-link { padding: 7px 11px; font-size: 12px; }
  .product-grid { grid-template-columns: 1fr; gap: 14px; margin-top: 30px; }
  .product-card { min-height: 295px; padding: 24px; }
  .product-card.knowledge::before { left: 24px; }
  .product-card h2 { font-size: 27px; }
  .orbit-one { width: 360px; height: 360px; top: -235px; right: -220px; }
  .orbit-two { display: none; }
  .foundation-inner { align-items: flex-start; flex-direction: column; justify-content: center; gap: 21px; padding: 32px 0; }
  .foundation-inner > div { align-items: flex-start; gap: 15px; }
  .foundation-mark { width: 50px; height: 50px; border-radius: 12px; }
  .foundation-inner strong { display: block; font-size: 16px; line-height: 1.45; }
  .foundation-inner p { line-height: 1.5; }
  .footer-inner { flex-direction: column; }
  .footer-links { justify-content: flex-start; gap: 20px; padding-top: 0; }
  .footer-bottom { flex-direction: column; gap: 5px; }
}

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