:root {
  --bg: #060e1f;
  --bg-2: #0a1730;
  --panel: #0e2042;
  --panel-2: #102a55;
  --line: rgba(120, 180, 255, 0.14);
  --text: #e8f1ff;
  --muted: #9fb4d4;
  --brand: #36c5ff;
  --brand-2: #2e7bff;
  --brand-deep: #0a3a8c;
  --grad: linear-gradient(120deg, #4fd2ff 0%, #2e7bff 55%, #6a5cff 100%);
  --radius: 18px;
  --maxw: 1180px;
  --shadow: 0 24px 60px rgba(2, 12, 35, 0.55);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 26px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.3px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  cursor: pointer;
  border: 1px solid transparent;
  white-space: nowrap;
}
.btn--primary {
  background: var(--grad);
  color: #04122e;
  box-shadow: 0 12px 30px rgba(46, 123, 255, 0.4);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 18px 40px rgba(46, 123, 255, 0.55); }
.btn--ghost {
  background: rgba(120, 180, 255, 0.06);
  border-color: var(--line);
  color: var(--text);
}
.btn--ghost:hover { background: rgba(120, 180, 255, 0.14); transform: translateY(-2px); }

/* ---------- 导航 ---------- */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  transition: background 0.3s ease, border-color 0.3s ease, backdrop-filter 0.3s ease;
  border-bottom: 1px solid transparent;
}
.nav.is-scrolled {
  background: rgba(6, 14, 31, 0.82);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--line);
}
.nav__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  height: 72px;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 20px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand__mark { display: grid; place-items: center; filter: drop-shadow(0 6px 14px rgba(54, 197, 255, 0.35)); }
.brand__text { display: flex; flex-direction: column; line-height: 1.1; }
.brand__text strong { font-size: 19px; letter-spacing: 0.4px; }
.brand__text strong em { font-style: normal; color: var(--brand); }
.brand__text small { font-size: 11px; color: var(--muted); letter-spacing: 3px; }

.nav__links { display: flex; gap: 6px; margin-left: auto; }
.nav__links a {
  padding: 9px 14px;
  border-radius: 10px;
  font-size: 14.5px;
  color: var(--muted);
  transition: color 0.2s ease, background 0.2s ease;
}
.nav__links a:hover, .nav__links a.is-active { color: var(--text); background: rgba(120, 180, 255, 0.1); }
.nav__cta { margin-left: 8px; padding: 10px 20px; font-size: 14px; }

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(120, 180, 255, 0.06);
  cursor: pointer;
  align-items: center;
  justify-content: center;
}
.nav__toggle span { width: 18px; height: 2px; background: var(--text); border-radius: 2px; transition: 0.25s; }
.nav__toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 168px 24px 110px;
  overflow: hidden;
}
.hero__bg { position: absolute; inset: 0; z-index: 0; }
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  opacity: 0.55;
}
.orb--1 { width: 460px; height: 460px; background: #1652c8; top: -120px; left: -80px; }
.orb--2 { width: 380px; height: 380px; background: #1ea8ff; bottom: -120px; right: -60px; opacity: 0.45; }
.orb--3 { width: 300px; height: 300px; background: #6a5cff; top: 40%; left: 55%; opacity: 0.3; }
.grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(120, 180, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120, 180, 255, 0.06) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(circle at 50% 30%, #000 0%, transparent 75%);
}
.hero__inner { position: relative; z-index: 1; max-width: var(--maxw); margin: 0 auto; text-align: center; }
.hero__eyebrow {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 1.5px;
  color: var(--brand);
  padding: 7px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(54, 197, 255, 0.07);
  margin-bottom: 26px;
}
.hero__title {
  font-size: clamp(34px, 6vw, 64px);
  line-height: 1.18;
  font-weight: 900;
  letter-spacing: 1px;
}
.grad {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero__lead {
  max-width: 760px;
  margin: 26px auto 0;
  font-size: clamp(15px, 2vw, 18px);
  color: var(--muted);
}
.hero__actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin-top: 38px; }
.hero__stats {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  margin-top: 56px;
}
.hero__stats li {
  background: rgba(14, 32, 66, 0.7);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px 26px;
  min-width: 130px;
  backdrop-filter: blur(6px);
}
.hero__stats strong { display: block; font-size: 22px; color: var(--brand); }
.hero__stats span { font-size: 13px; color: var(--muted); }

/* ---------- 通用 section ---------- */
.section { max-width: var(--maxw); margin: 0 auto; padding: 96px 24px; }
.section--alt { max-width: none; background: linear-gradient(180deg, var(--bg) 0%, var(--bg-2) 100%); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section--alt > * { max-width: var(--maxw); margin-left: auto; margin-right: auto; }
.section__head { text-align: center; max-width: 720px; margin: 0 auto 54px; }
.tag {
  display: inline-block;
  font-size: 12.5px;
  letter-spacing: 2px;
  color: var(--brand);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 14px;
  margin-bottom: 18px;
  background: rgba(54, 197, 255, 0.06);
}
.section__head h2 { font-size: clamp(26px, 4vw, 40px); font-weight: 800; letter-spacing: 0.5px; }
.section__head p { color: var(--muted); margin-top: 14px; font-size: 16px; }

/* ---------- 业务总览 ---------- */
.biz-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.biz-card {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px 26px;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
  overflow: hidden;
}
.biz-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(420px circle at var(--mx, 50%) var(--my, 0%), rgba(54, 197, 255, 0.16), transparent 60%);
  opacity: 0;
  transition: opacity 0.3s ease;
}
.biz-card:hover { transform: translateY(-6px); border-color: rgba(54, 197, 255, 0.45); box-shadow: var(--shadow); }
.biz-card:hover::before { opacity: 1; }
.biz-card__icon { font-size: 34px; display: block; margin-bottom: 16px; }
.biz-card h3 { font-size: 20px; margin-bottom: 10px; }
.biz-card p { color: var(--muted); font-size: 14.5px; }
.biz-card__more { display: inline-block; margin-top: 18px; color: var(--brand); font-weight: 700; font-size: 14px; }

/* ---------- Feature ---------- */
.feature { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 50px; align-items: center; }
.feature--reverse .feature__text { order: 2; }
.feature__text h2 { font-size: clamp(24px, 3.4vw, 36px); font-weight: 800; margin: 14px 0 16px; }
.feature__text p { color: var(--muted); font-size: 16px; }
.check { list-style: none; margin-top: 22px; display: grid; gap: 12px; }
.check li { position: relative; padding-left: 30px; color: var(--text); font-size: 15.5px; }
.check li::before {
  content: "✓";
  position: absolute;
  left: 0; top: 1px;
  width: 20px; height: 20px;
  background: var(--grad);
  color: #04122e;
  font-size: 12px;
  font-weight: 900;
  border-radius: 50%;
  display: grid;
  place-items: center;
}
.feature__panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 22px;
  box-shadow: var(--shadow);
}
.panel-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 4px;
  border-bottom: 1px solid var(--line);
}
.panel-row:last-child { border-bottom: none; }
.panel-row span { color: var(--muted); font-size: 15px; }
.panel-row b { color: var(--brand); font-size: 15px; font-weight: 700; }

/* ---------- 服务网格 ---------- */
.svc-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.svc-grid--3 { grid-template-columns: repeat(4, 1fr); }
.svc {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: transform 0.25s ease, border-color 0.25s ease;
}
.svc:hover { transform: translateY(-5px); border-color: rgba(54, 197, 255, 0.4); }
.svc h3 { font-size: 18px; margin-bottom: 10px; }
.svc p { color: var(--muted); font-size: 14.5px; }
.svc--accent { background: linear-gradient(160deg, var(--panel) 0%, var(--panel-2) 100%); }

/* ---------- 优势 ---------- */
.why-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.why {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px 24px;
}
.why__num {
  font-size: 15px;
  font-weight: 900;
  color: var(--brand);
  letter-spacing: 1px;
}
.why h3 { font-size: 19px; margin: 12px 0 8px; }
.why p { color: var(--muted); font-size: 14.5px; }

/* ---------- 关于 ---------- */
.about { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 46px; align-items: start; }
.about__text h2 { font-size: clamp(24px, 3.4vw, 34px); font-weight: 800; margin: 14px 0 18px; }
.about__text p { color: var(--muted); font-size: 16px; margin-bottom: 14px; }
.about__cards { display: grid; gap: 16px; }
.about__card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 24px;
}
.about__card strong { color: var(--brand); font-size: 14px; letter-spacing: 1px; }
.about__card p { margin-top: 8px; font-size: 15px; }

/* ---------- CTA ---------- */
.section--cta { max-width: none; }
.cta {
  max-width: 920px;
  margin: 0 auto;
  text-align: center;
  background: linear-gradient(135deg, var(--panel-2), var(--panel));
  border: 1px solid var(--line);
  border-radius: 28px;
  padding: 64px 32px;
  box-shadow: var(--shadow);
}
.cta h2 { font-size: clamp(26px, 4vw, 38px); font-weight: 800; }
.cta p { color: var(--muted); margin: 16px auto 0; max-width: 600px; }
.cta__info {
  display: grid;
  gap: 12px;
  max-width: 560px;
  margin: 34px auto;
  text-align: left;
}
.cta__info div {
  display: flex;
  gap: 14px;
  align-items: baseline;
  background: rgba(6, 14, 31, 0.5);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px 18px;
}
.cta__info span { color: var(--brand); font-size: 13px; min-width: 72px; font-weight: 700; }
.cta__info b { font-size: 15px; font-weight: 500; }

/* ---------- 页脚 ---------- */
.footer { border-top: 1px solid var(--line); background: var(--bg-2); }
.footer__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 48px 24px 28px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
}
.footer__brand strong { font-size: 20px; }
.footer__brand strong em { font-style: normal; color: var(--brand); }
.footer__brand p { color: var(--muted); font-size: 13.5px; margin-top: 8px; max-width: 360px; }
.footer__nav { display: flex; flex-wrap: wrap; gap: 8px 20px; align-items: flex-start; }
.footer__nav a { color: var(--muted); font-size: 14.5px; transition: color 0.2s ease; }
.footer__nav a:hover { color: var(--brand); }
.footer__copy { text-align: center; color: var(--muted); font-size: 13px; padding: 22px 24px; border-top: 1px solid var(--line); }

/* ---------- 入场动画 ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .biz-grid, .svc-grid, .why-grid { grid-template-columns: repeat(2, 1fr); }
  .feature, .about { grid-template-columns: 1fr; gap: 32px; }
  .feature--reverse .feature__text { order: 0; }
}
@media (max-width: 720px) {
  .nav__links {
    position: fixed;
    inset: 72px 0 auto 0;
    flex-direction: column;
    background: rgba(6, 14, 31, 0.97);
    backdrop-filter: blur(14px);
    padding: 18px 24px 26px;
    border-bottom: 1px solid var(--line);
    gap: 4px;
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: 0.25s ease;
  }
  .nav__links.is-open { transform: none; opacity: 1; pointer-events: auto; }
  .nav__links a { padding: 13px 14px; font-size: 16px; }
  .nav__cta { display: none; }
  .nav__toggle { display: flex; margin-left: auto; }
  .hero { padding: 130px 20px 80px; }
  .section { padding: 70px 20px; }
  .biz-grid, .svc-grid, .why-grid, .svc-grid--3 { grid-template-columns: 1fr; }
  .hero__stats li { flex: 1 1 40%; min-width: 0; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; transition: none; }
}