:root {
  --bg: #f6f4ef;
  --panel: #fbfaf7;
  --ink: #1c2226;
  --muted: #5f676c;
  --line: #dcd8cf;
  --accent: #1f4e5f;
  --accent-soft: #e3ebec;
  --shadow: 0 18px 40px -18px rgba(28, 34, 38, .28);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14181b;
    --panel: #191e21;
    --ink: #e9e6df;
    --muted: #9aa1a5;
    --line: #2b3236;
    --accent: #7fb3c4;
    --accent-soft: #1f2a2e;
    --shadow: 0 18px 40px -18px rgba(0, 0, 0, .7);
  }
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
html, body { background: var(--bg); color: var(--ink); }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
               "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.65;
  min-height: 100vh;
  display: flex; flex-direction: column;
  -webkit-font-smoothing: antialiased;
}
main { flex: 1; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
ul { list-style: none; }
.wrap { width: 100%; max-width: 1120px; margin: 0 auto; padding: 0 28px; }
.svg { width: 19px; height: 19px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }

/* ---------- header & mega menu ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 90%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  -webkit-backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--line);
}
.bar { display: flex; align-items: center; height: 64px; }
.logo { display: flex; align-items: center; gap: 12px; }
.mark {
  width: 30px; height: 30px; border-radius: 7px; flex: none;
  background: var(--accent); color: var(--bg);
  display: grid; place-items: center; font-weight: 600; font-size: 16px;
}
.brand { font-weight: 600; letter-spacing: .02em; }
.nav { margin-left: auto; display: flex; align-items: center; height: 100%; gap: 6px; }
.nav-link {
  display: inline-flex; align-items: center; gap: 4px; height: 36px; padding: 0 12px;
  border-radius: 8px; font-size: 14.5px; color: var(--muted);
}
.nav-link:hover, .nav-link.on, .nav-drop.open .drop-btn { color: var(--ink); }
.nav-link.on { font-weight: 500; }
.chev { width: 14px; height: 14px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; transition: transform .2s; }
.nav-drop { height: 100%; display: flex; align-items: center; }
.nav-drop.open .chev { transform: rotate(180deg); }

.mega {
  position: absolute; left: 0; right: 0; top: 100%;
  background: var(--bg); border-bottom: 1px solid var(--line); box-shadow: var(--shadow);
  opacity: 0; visibility: hidden; transform: translateY(-6px);
  transition: opacity .18s ease, transform .18s ease, visibility 0s linear .18s;
  max-height: calc(100vh - 64px); overflow-y: auto;
}
.nav-drop.open .mega { opacity: 1; visibility: visible; transform: none; transition-delay: 0s; }
.mega-inner { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 28px; padding-top: 28px; padding-bottom: 12px; }
.mega-title {
  display: flex; align-items: center; gap: 6px; font-size: 13px; font-weight: 600;
  color: var(--accent); letter-spacing: .04em; padding-bottom: 10px; margin-bottom: 6px;
  border-bottom: 1px solid var(--line);
}
.ma { width: 14px; height: 14px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; flex: none; }
.mega-title .ma { opacity: 0; transform: translateX(-4px); transition: .15s; }
.mega-title:hover .ma { opacity: 1; transform: none; }
.mega ul a { display: flex; gap: 10px; padding: 9px 8px; margin: 0 -8px; border-radius: 8px; }
.mega ul a:hover { background: var(--accent-soft); }
.mi { width: 17px; height: 17px; margin-top: 3px; flex: none; fill: none; stroke: var(--accent); stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.mega ul b { display: block; font-size: 14px; font-weight: 500; line-height: 1.5; }
.mega ul small {
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
  font-size: 12px; color: var(--muted); line-height: 1.5;
}
.mega-foot { padding-top: 6px; padding-bottom: 20px; }
.mega-foot a { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; color: var(--accent); }
.mega-foot a:hover { text-decoration: underline; }

@media (max-width: 980px) {
  .mega-inner { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  .brand { display: none; }
  .nav-link { padding: 0 9px; }
  .mega-inner { grid-template-columns: 1fr 1fr; gap: 20px; }
  .mega ul small { display: none; }
}

/* ---------- hero ---------- */
.hero { padding: 104px 0 96px; }
.eyebrow { color: var(--accent); font-size: 13px; letter-spacing: .18em; text-transform: uppercase; margin-bottom: 24px; }
h1 { font-size: clamp(32px, 5.6vw, 56px); line-height: 1.22; font-weight: 600; letter-spacing: .03em; }
.en { margin-top: 12px; font-size: clamp(15px, 2vw, 19px); color: var(--muted); }
.rule { width: 56px; height: 2px; background: var(--accent); margin: 40px 0 28px; }
.lead { max-width: 640px; font-size: 17px; color: var(--muted); }
.lead strong { color: var(--ink); font-weight: 500; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 40px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; height: 42px; padding: 0 20px;
  border-radius: 9px; font-size: 14.5px; border: 1px solid var(--line);
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--bg); }
.btn:hover { border-color: var(--accent); }
.btn.primary:hover { filter: brightness(1.08); }

.hero > * { animation: rise .7s cubic-bezier(.2,.7,.2,1) both; }
.hero > :nth-child(2) { animation-delay: .05s; }
.hero > :nth-child(3) { animation-delay: .1s; }
.hero > :nth-child(4) { animation-delay: .15s; }
.hero > :nth-child(5) { animation-delay: .2s; }
.hero > :nth-child(6) { animation-delay: .25s; }
@keyframes rise { from { opacity: 0; transform: translateY(10px); } }
@media (prefers-reduced-motion: reduce) {
  .hero > * { animation: none; }
  html { scroll-behavior: auto; }
  .mega, .chev { transition: none; }
}

/* ---------- sections ---------- */
section { border-top: 1px solid var(--line); padding: 84px 0; }
.sec-head { display: grid; gap: 10px; margin-bottom: 48px; max-width: 640px; }
.sec-no { font-size: 13px; color: var(--accent); letter-spacing: .14em; }
h2 { font-size: clamp(24px, 3.4vw, 32px); font-weight: 600; letter-spacing: .02em; line-height: 1.3; }
.sec-head p { color: var(--muted); }

/* 首页场景卡片 */
.scenes { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.scene {
  display: flex; flex-direction: column; padding: 24px; border: 1px solid var(--line);
  border-radius: 12px; background: var(--panel); transition: border-color .15s, transform .15s;
}
.scene:hover { border-color: var(--accent); transform: translateY(-2px); }
.scene-ico, .ico {
  width: 38px; height: 38px; border-radius: 9px; background: var(--accent-soft);
  color: var(--accent); display: grid; place-items: center; flex: none;
}
.scene h3 { font-size: 17px; font-weight: 600; margin-top: 18px; }
.scene p { font-size: 13.5px; color: var(--muted); margin-top: 4px; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; margin: 16px 0 20px; }
.tags span { font-size: 12px; padding: 2px 9px; border-radius: 99px; border: 1px solid var(--line); color: var(--muted); }
.more { margin-top: auto; display: inline-flex; align-items: center; gap: 6px; font-size: 13px; color: var(--accent); }
@media (max-width: 860px) { .scenes { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .scenes { grid-template-columns: 1fr; } }

/* principles */
.principles { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 40px; }
.principles h3 { font-size: 16px; font-weight: 600; margin-bottom: 8px; }
.principles h3::before { content: ""; display: block; width: 22px; height: 2px; background: var(--accent); margin-bottom: 16px; }
.principles p { font-size: 14.5px; color: var(--muted); }
@media (max-width: 760px) { .principles { grid-template-columns: 1fr; gap: 28px; } }

/* 全部功能页 */
.group { display: grid; grid-template-columns: 220px 1fr; gap: 28px; padding: 36px 0; border-top: 1px dashed var(--line); }
.group:first-child { border-top: 0; padding-top: 0; }
.g-title { font-size: 17px; font-weight: 600; }
.g-title:hover { color: var(--accent); }
.g-sub { font-size: 13px; color: var(--muted); margin-top: 4px; }
.items { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.item {
  display: grid; grid-template-columns: 38px 1fr; gap: 14px; align-items: start;
  padding: 18px; border: 1px solid var(--line); border-radius: 10px; background: var(--panel);
  transition: border-color .15s;
}
.item:hover { border-color: var(--accent); }
.item h3 { font-size: 15.5px; font-weight: 600; line-height: 1.4; }
.item p { font-size: 13.5px; color: var(--muted); margin-top: 4px; }
@media (max-width: 860px) { .group { grid-template-columns: 1fr; gap: 18px; } }
@media (max-width: 600px) { .items { grid-template-columns: 1fr; } }

/* 子页通用 */
.page-hero { padding: 72px 28px 56px; }
.crumb { font-size: 13px; color: var(--muted); margin-bottom: 22px; }
.crumb a:hover { color: var(--ink); }
.page-hero h1 { font-size: clamp(30px, 4.6vw, 44px); }
.page-hero .lead { margin-top: 18px; }
.toc { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 32px; }
.toc a { font-size: 13.5px; padding: 5px 14px; border-radius: 99px; border: 1px solid var(--line); color: var(--muted); }
.toc a:hover { border-color: var(--accent); color: var(--accent); }

.feats { padding-top: 24px; }
.feat {
  display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 40px;
  padding: 44px 0; border-top: 1px dashed var(--line); scroll-margin-top: 80px;
}
.feat:first-child { border-top: 0; }
.feat:target .ico { background: var(--accent); color: var(--bg); }
.feat-head { display: flex; gap: 16px; align-items: flex-start; }
.ico.lg { width: 46px; height: 46px; border-radius: 11px; }
.ico.lg .svg { width: 22px; height: 22px; }
.feat h2 { font-size: 22px; }
.feat-head p { color: var(--muted); font-size: 14.5px; margin-top: 6px; }
.pts { display: grid; gap: 10px; }
.pts li {
  position: relative; padding: 12px 16px 12px 36px; border: 1px solid var(--line);
  border-radius: 9px; background: var(--panel); font-size: 14.5px;
}
.pts li::before {
  content: ""; position: absolute; left: 16px; top: 21px; width: 7px; height: 7px;
  border-radius: 50%; background: var(--accent);
}
@media (max-width: 760px) { .feat { grid-template-columns: 1fr; gap: 20px; } }

.others-title { font-size: 18px; margin-bottom: 20px; }
.others-list { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.others-list a { padding: 16px 18px; border: 1px solid var(--line); border-radius: 10px; background: var(--panel); }
.others-list a:hover { border-color: var(--accent); }
.others-list b { display: block; font-size: 15px; font-weight: 600; }
.others-list small { font-size: 12.5px; color: var(--muted); }
@media (max-width: 860px) { .others-list { grid-template-columns: 1fr 1fr; } }

/* about */
.about { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.about p { color: var(--muted); }
.about p + p { margin-top: 14px; }
dl.info { display: grid; grid-template-columns: 96px 1fr; gap: 12px 16px; font-size: 14.5px; }
dl.info dt { color: var(--muted); }
@media (max-width: 760px) { .about { grid-template-columns: 1fr; gap: 32px; } }

.site-footer { border-top: 1px solid var(--line); font-size: 13px; color: var(--muted); }
.site-footer .wrap {
  display: flex; flex-wrap: wrap; justify-content: space-between;
  gap: 8px 24px; padding-top: 24px; padding-bottom: 24px;
}
.site-footer a:hover { color: var(--ink); }

/* ---------- 多产品线（2026-10-30b） ---------- */
.mega-inner { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.mega ul small { -webkit-line-clamp: 1; }
@media (max-width: 980px) { .mega-inner { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
section.flat { border-top: 0; padding-top: 8px; }
.page-hero .cta { margin-top: 28px; }
.page-hero .cta + .toc { margin-top: 20px; }
.btn .ma { width: 15px; height: 15px; }
.sec-title { font-size: 15px; font-weight: 600; color: var(--accent); letter-spacing: .06em; padding-bottom: 8px; }
.scenes.four { grid-template-columns: repeat(2, minmax(0, 1fr)); }
@media (max-width: 560px) { .scenes.four { grid-template-columns: 1fr; } }

/* ---------- 按业务能力组织 + 多端标注（2026-10-30d） ---------- */
.mega-inner.cols-6 { grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 22px; }
.mega-inner.cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
@media (max-width: 1080px) { .mega-inner.cols-6 { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (max-width: 980px) { .mega-inner.cols-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 640px) {
  .mega-inner.cols-6 { grid-template-columns: 1fr 1fr; }
  .mega ul small { display: block; }
}
.mega .plat {
  display: flex; flex-direction: column; gap: 4px; height: 100%; padding: 16px;
  border: 1px solid var(--line); border-radius: 10px; background: var(--panel);
}
.mega .plat:hover { border-color: var(--accent); }
.mega .plat .ico { margin-bottom: 8px; }
.mega .plat b { font-size: 15px; font-weight: 600; }
.mega .plat small { font-size: 12.5px; color: var(--muted); }
.mega .plat em { font-style: normal; font-size: 12px; color: var(--muted); margin-top: 8px; line-height: 1.6; }
.badges { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.badges a {
  display: inline-flex; align-items: center; gap: 5px; font-size: 12px; padding: 2px 10px 2px 8px;
  border-radius: 99px; background: var(--accent-soft); color: var(--accent);
}
.badges a:hover { background: var(--accent); color: var(--bg); }
.bi { width: 13px; height: 13px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.item small.on { display: block; font-size: 12px; color: var(--accent); margin-top: 6px; }
.scenes.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
@media (max-width: 860px) { .scenes.three { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .scenes.three { grid-template-columns: 1fr; } }
#platforms { scroll-margin-top: 80px; }