:root {
  --tg: #2aabee;
  --tg-deep: #179cde;
  --ink: #222222;
  --mute: #707579;
  --line: #e4e7ea;
  --bg: #ffffff;
  --soft: #f4f7fa;
  --card: #ffffff;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  min-height: 100vh;
  color: var(--ink);
  font-family: "Segoe UI", "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  line-height: 1.55;
}
.grid-floor, body::before, body::after, .stamp, .hero-grid > div:first-child::before { display: none !important; }
a { color: var(--tg); text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(1080px, calc(100% - 40px)); margin: 0 auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: #fff;
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex;
  align-items: center;
  gap: 18px;
  min-height: 68px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  color: var(--ink);
}
.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--tg);
}
.brand-mark svg { width: 18px; height: 18px; fill: #fff; }
.brand-name {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.lang-switch {
  display: flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
}
.lang-switch button {
  border: 0;
  background: #fff;
  color: var(--mute);
  font: 600 12px/1 "Segoe UI", "PingFang SC", sans-serif;
  padding: 7px 11px;
  cursor: pointer;
}
.lang-switch button.active {
  background: var(--tg);
  color: #fff;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: auto;
  flex-wrap: wrap;
  justify-content: flex-end;
}
.nav-links a {
  font-size: 14px;
  color: #5a6168;
  padding: 8px 11px;
  border-radius: 8px;
}
.nav-links a:hover, .nav-links a.active { color: var(--tg); }
.nav-links a.news-link {
  color: #fff;
  background: var(--tg);
  font-weight: 600;
}
.nav-links a.news-link:hover { background: var(--tg-deep); color: #fff; }
.menu-btn {
  display: none;
  margin-left: auto;
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  border-radius: 8px;
  cursor: pointer;
}

.hero { padding: 72px 0 28px; }
.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1.05fr;
  gap: 48px;
  align-items: center;
}
.kicker {
  color: var(--tg);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-bottom: 10px;
}
h1, .display {
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--ink);
}
.hero h1 {
  font-size: clamp(36px, 5vw, 56px);
  margin-bottom: 14px;
  color: #1d2733;
}
.lede {
  color: var(--mute);
  font-size: 17px;
  line-height: 1.7;
  max-width: 520px;
}
.lede + .lede { margin-top: 10px; }
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
}
.btn-cyan, .btn-pink {
  background: var(--tg);
  color: #fff;
}
.btn-cyan:hover, .btn-pink:hover { background: var(--tg-deep); color: #fff; }
.btn-ghost {
  border-color: var(--tg);
  color: var(--tg);
  background: #fff;
}
.btn-ghost:hover { background: #eef8fd; }
.hero-stage { position: relative; min-height: 420px; }
.shot {
  position: absolute;
  border-radius: 18px;
  overflow: hidden;
  background: #eef3f7;
  box-shadow: 0 16px 40px rgba(34, 51, 68, 0.12);
}
.shot img { width: 100%; height: 100%; object-fit: cover; }
.shot-a { width: 78%; right: 4%; top: 8%; aspect-ratio: 16/10; z-index: 1; }
.shot-b { width: 38%; left: 0; bottom: 6%; aspect-ratio: 4/5; z-index: 2; }
.shot-c { width: 36%; right: 0; bottom: 0; aspect-ratio: 4/5; z-index: 3; }

.section { padding: 64px 0; }
.section:nth-of-type(even) { background: var(--soft); }
.section h2 {
  font-size: clamp(26px, 3vw, 34px);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 10px;
  color: #1d2733;
  text-transform: none;
}
.section-lead { color: var(--mute); max-width: 640px; line-height: 1.7; margin-bottom: 28px; }

.platform-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 14px;
}
.platform-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 150px;
  padding: 20px 16px;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 14px;
  color: var(--ink);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.platform-card:hover {
  border-color: var(--tg);
  box-shadow: 0 8px 22px rgba(42, 171, 238, 0.12);
  color: var(--ink);
}
.platform-card strong { font-size: 15px; }
.platform-card span { color: var(--mute); font-size: 13px; line-height: 1.5; }
.ico {
  width: 36px; height: 36px;
  display: grid; place-items: center;
  border-radius: 10px;
  background: #e8f6fd;
  color: var(--tg);
  font-weight: 700;
}

.news-grid, .why-grid, .faq-list, .split, .card-grid { display: grid; gap: 16px; }
.news-grid { grid-template-columns: repeat(4, 1fr); }
.news-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
}
.news-card img {
  width: 100%;
  height: 150px;
  object-fit: cover;
}
.news-card div { padding: 14px 14px 16px; }
.news-card time { color: var(--tg); font-size: 12px; font-weight: 700; }
.news-card h3 { font-size: 16px; margin: 8px 0; line-height: 1.4; color: var(--ink); }
.news-card p { color: var(--mute); font-size: 13px; line-height: 1.6; }

.why-grid { grid-template-columns: repeat(3, 1fr); }
.why-card {
  padding: 24px 18px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
}
.why-card b {
  display: block;
  margin: 10px 0 8px;
  font-size: 18px;
}
.why-card p { color: var(--mute); font-size: 14px; line-height: 1.65; }

.crumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  font-size: 13px;
  color: var(--mute);
  margin-bottom: 16px;
}
.crumbs a { color: var(--tg); }
.crumbs span[aria-hidden] { color: #c0c4c8; }
.updated { color: var(--mute); font-size: 13px; margin-top: 10px; }
.page-hero { padding: 48px 0 12px; }
.page-hero h1 {
  font-size: clamp(28px, 4vw, 42px);
  margin-bottom: 12px;
  letter-spacing: -0.03em;
}
.article {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 28px;
  line-height: 1.8;
  color: #3a4148;
}
.article p + p, .article ul + p, .article p + ul { margin-top: 14px; }
.article h2, .article h3 {
  color: #1d2733;
  margin: 22px 0 10px;
  letter-spacing: -0.02em;
  text-transform: none;
  text-shadow: none;
}
.article ul { padding-left: 18px; color: var(--mute); }
.split { grid-template-columns: 1.1fr 0.9fr; align-items: start; }
.side-shot {
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 12px 32px rgba(34, 51, 68, 0.1);
}
.side-shot img { width: 100%; height: 100%; object-fit: cover; min-height: 280px; }

.faq-item {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 14px;
  padding: 18px 20px;
}
.faq-item h3 { font-size: 17px; margin-bottom: 8px; }
.faq-item p { color: var(--mute); line-height: 1.7; }

.card-grid { grid-template-columns: repeat(3, 1fr); }
.info-card {
  padding: 20px;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 14px;
}
.info-card h3 { margin-bottom: 8px; }
.info-card p { color: var(--mute); font-size: 14px; line-height: 1.7; }

.site-footer {
  margin-top: 0;
  border-top: 1px solid var(--line);
  background: #f7f9fb;
  padding: 48px 0 24px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(6, 1fr);
  gap: 18px;
}
.site-footer h4 {
  font-size: 13px;
  font-weight: 700;
  color: #1d2733;
  margin-bottom: 12px;
}
.site-footer a, .site-footer p {
  display: block;
  color: var(--mute);
  font-size: 13px;
  line-height: 1.9;
}
.site-footer a:hover { color: var(--tg); }
.legal {
  margin-top: 28px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  color: #8a9198;
  font-size: 12px;
}
[hidden], .lang-zh { display: none; }
html[data-lang="zh"] .lang-en { display: none !important; }
html[data-lang="zh"] .lang-zh { display: revert !important; }
html[data-lang="en"] .lang-en { display: revert; }
html[data-lang="en"] .lang-zh { display: none !important; }

@media (max-width: 1080px) {
  .platform-grid, .news-grid, .footer-grid, .card-grid { grid-template-columns: repeat(2, 1fr); }
  .why-grid { grid-template-columns: 1fr 1fr; }
  .hero-grid, .split { grid-template-columns: 1fr; }
  .hero-stage { min-height: 360px; }
}
@media (max-width: 760px) {
  .menu-btn { display: grid; place-items: center; }
  .nav-links {
    display: none;
    position: absolute;
    left: 20px; right: 20px; top: 68px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 10px;
    flex-direction: column;
    align-items: stretch;
    box-shadow: 0 12px 30px rgba(0,0,0,0.08);
  }
  .nav-links.open { display: flex; }
  .platform-grid, .news-grid, .why-grid, .footer-grid, .card-grid { grid-template-columns: 1fr; }
  .shot-a { width: 86%; }
}