:root {
  --blue: #0e7cff;
  --blue-deep: #0a4fd6;
  --cyan: #19c6e6;
  --ink: #0f1b2d;
  --ink-soft: #4a5a72;
  --line: #e6ecf5;
  --bg: #ffffff;
  --bg-tint: #f4f8ff;
  --amber: #f59e0b;
  --radius: 16px;
  --shadow: 0 12px 34px rgba(14, 79, 214, 0.10);
  --shadow-hover: 0 18px 48px rgba(14, 79, 214, 0.18);
  --maxw: 1140px;
  --font: "Segoe UI", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- 导航 ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s, box-shadow .3s;
}
.nav.is-scrolled { border-color: var(--line); box-shadow: 0 6px 24px rgba(15, 27, 45, .06); }
.nav__inner {
  max-width: var(--maxw); margin: 0 auto; padding: 12px 24px;
  display: flex; align-items: center; justify-content: space-between;
}
.nav__brand { display: flex; align-items: center; gap: 10px; }
.nav__brand-img { height: 38px; width: 38px; display: block; }
.nav__brand-text { font-weight: 800; font-size: 20px; letter-spacing: .01em; color: var(--ink); }
.nav__menu { display: flex; gap: 28px; align-items: center; }
.nav__link { color: var(--ink-soft); font-weight: 500; position: relative; padding: 4px 0; transition: color .2s; }
.nav__link:hover { color: var(--blue); }
.nav__link::after {
  content: ""; position: absolute; left: 0; bottom: -2px; height: 2px; width: 0;
  background: linear-gradient(90deg, var(--blue), var(--cyan)); transition: width .25s;
}
.nav__link:hover::after { width: 100%; }
.nav__cta { margin-left: 6px; }
.nav__toggle { display: none; flex-direction: column; gap: 5px; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav__toggle span { width: 24px; height: 2px; background: var(--ink); border-radius: 2px; transition: .25s; }
.nav__toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle.is-open span:nth-child(2) { opacity: 0; }
.nav__toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; color: #fff; }
.hero__bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(900px 500px at 80% -10%, rgba(25, 198, 230, .45), transparent 60%),
    radial-gradient(700px 500px at 10% 110%, rgba(14, 124, 255, .55), transparent 60%),
    linear-gradient(135deg, #0a2a6e, #0e7cff 70%, #19c6e6);
}
.hero__bg::after {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.06) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(circle at 50% 40%, #000 30%, transparent 78%);
  -webkit-mask-image: radial-gradient(circle at 50% 40%, #000 30%, transparent 78%);
}
.hero__inner { position: relative; max-width: var(--maxw); margin: 0 auto; padding: 120px 24px 130px; text-align: center; }
.hero__eyebrow { letter-spacing: .18em; font-size: 13px; opacity: .85; text-transform: uppercase; }
.hero__title { font-size: clamp(34px, 6vw, 60px); font-weight: 800; margin: 14px 0 10px; line-height: 1.1; }
.hero__tagline { font-size: clamp(16px, 2.4vw, 22px); font-weight: 600; color: #d8f3ff; }
.hero__desc { max-width: 720px; margin: 18px auto 32px; font-size: 16px; color: #eaf4ff; opacity: .92; }
.hero__actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.hero__scroll { position: absolute; left: 50%; bottom: 22px; transform: translateX(-50%); width: 24px; height: 38px; border: 2px solid rgba(255,255,255,.6); border-radius: 14px; }
.hero__scroll span { position: absolute; left: 50%; top: 8px; width: 4px; height: 8px; background: #fff; border-radius: 2px; transform: translateX(-50%); animation: scrolldot 1.6s infinite; }
@keyframes scrolldot { 0% { opacity: 0; top: 8px; } 40% { opacity: 1; } 100% { opacity: 0; top: 22px; } }

/* ---------- 按钮 ---------- */
.btn { display: inline-block; padding: 12px 26px; border-radius: 999px; font-weight: 600; font-size: 15px; transition: transform .2s, box-shadow .2s, background .2s; cursor: pointer; border: 0; }
.btn--primary { background: linear-gradient(135deg, var(--blue), var(--cyan)); color: #fff; box-shadow: 0 10px 26px rgba(14, 124, 255, .4); }
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 14px 34px rgba(14, 124, 255, .5); }
.btn--ghost { background: rgba(255,255,255,.12); color: #fff; border: 1px solid rgba(255,255,255,.5); }
.btn--ghost:hover { background: rgba(255,255,255,.22); transform: translateY(-2px); }
.btn--outline { background: #fff; color: var(--blue); border: 1px solid var(--blue); }
.btn--outline:hover { background: var(--bg-tint); transform: translateY(-2px); }
.btn--block { width: 100%; }

/* ---------- 通用 section ---------- */
.section { padding: 92px 0; }
.section--tint { background: var(--bg-tint); }
.section__head { text-align: center; max-width: 760px; margin: 0 auto 52px; }
.section__kicker { display: inline-block; font-size: 13px; letter-spacing: .18em; color: var(--blue); font-weight: 700; }
.section__title { font-size: clamp(26px, 3.4vw, 38px); font-weight: 800; margin: 8px 0 12px; }
.section__lead { color: var(--ink-soft); font-size: 16px; }

/* ---------- 产品展示 ---------- */
.product__grid { display: grid; grid-template-columns: 1.05fr 1fr; gap: 44px; align-items: center; }
.product__intro { display: flex; flex-direction: column; gap: 16px; }
.product__badge-row { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.product__name { font-size: clamp(26px, 3.6vw, 36px); font-weight: 800; color: var(--ink); margin: 0; }
.product__tag { color: var(--ink-soft); font-size: 16px; }
.product__desc { color: var(--ink-soft); font-size: 16px; }
.badge {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 5px 14px; border-radius: 999px;
  font-size: 13px; font-weight: 700;
  background: rgba(245, 158, 11, .12); color: #b9740a; border: 1px solid rgba(245, 158, 11, .35);
}
.badge::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--amber); box-shadow: 0 0 0 3px rgba(245,158,11,.2); }
.badge--blue { background: rgba(14,124,255,.10); color: var(--blue); border-color: rgba(14,124,255,.3); }
.badge--blue::before { background: var(--blue); box-shadow: 0 0 0 3px rgba(14,124,255,.18); }

.about__features { list-style: none; display: grid; gap: 16px; }
.feature { display: flex; gap: 16px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; box-shadow: var(--shadow); transition: transform .2s, box-shadow .2s; }
.feature:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.feature__icon { font-size: 26px; line-height: 1.4; }
.feature h3 { font-size: 17px; margin-bottom: 4px; }
.feature p { color: var(--ink-soft); font-size: 14px; }

/* ---------- 服务流程（双引擎） ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; counter-reset: step; }
.step { position: relative; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 32px 22px 28px; box-shadow: var(--shadow); text-align: center; transition: transform .2s, box-shadow .2s; }
.step:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.step__no {
  width: 48px; height: 48px; border-radius: 50%; display: inline-flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 18px; color: #fff; margin-bottom: 16px;
  background: linear-gradient(135deg, var(--blue), var(--cyan)); box-shadow: 0 8px 20px rgba(14,124,255,.32);
}
.step__title { font-size: 18px; margin-bottom: 8px; }
.step__text { color: var(--ink-soft); font-size: 14px; }
.step__opt { display: inline-block; margin-top: 10px; font-size: 12px; font-weight: 700; color: var(--blue); background: rgba(14,124,255,.10); padding: 3px 10px; border-radius: 999px; }

/* ---------- 卡片（两类服务 / 复用） ---------- */
.cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.card { position: relative; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 30px 26px 28px; box-shadow: var(--shadow); overflow: hidden; transition: transform .25s, box-shadow .25s; }
.card::before { content: ""; position: absolute; left: 0; top: 0; height: 4px; width: 100%; background: linear-gradient(90deg, var(--blue), var(--cyan)); transform: scaleX(0); transform-origin: left; transition: transform .3s; }
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.card:hover::before { transform: scaleX(1); }
.card__icon { font-size: 30px; }
.card__title { font-size: 21px; margin: 12px 0 10px; }
.card__text { color: var(--ink-soft); font-size: 15px; }
.card__list { list-style: none; margin-top: 14px; display: grid; gap: 8px; }
.card__list li { position: relative; padding-left: 22px; color: var(--ink-soft); font-size: 14px; }
.card__list li::before { content: ""; position: absolute; left: 0; top: 9px; width: 8px; height: 8px; border-radius: 50%; background: linear-gradient(135deg, var(--blue), var(--cyan)); }

/* ---------- 核心能力（复用） ---------- */
.caps { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.cap { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 28px 26px; box-shadow: var(--shadow); transition: transform .2s, box-shadow .2s; }
.cap:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.cap h3 { font-size: 19px; margin-bottom: 10px; color: var(--blue-deep); }
.cap p { color: var(--ink-soft); font-size: 15px; }

/* ---------- 抢先体验 CTA ---------- */
.cta__panel {
  max-width: 760px; margin: 0 auto; text-align: center;
  background: linear-gradient(135deg, #0a2a6e, #0e7cff 70%, #19c6e6);
  border-radius: 22px; padding: 54px 38px; color: #fff; box-shadow: var(--shadow-hover);
}
.cta__panel .section__title, .cta__panel .section__lead { color: #fff; }
.cta__panel .section__lead { color: #eaf4ff; opacity: .92; }
.cta__contact { margin-top: 26px; display: grid; gap: 12px; max-width: 460px; margin-left: auto; margin-right: auto; }
.cta__item {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.28);
  border-radius: 12px; padding: 14px 18px; text-align: left;
}
.cta__label { font-size: 13px; letter-spacing: .06em; color: #cfe6ff; font-weight: 700; }
.cta__value { font-size: 15px; font-weight: 600; color: #fff; }
.cta__value a { color: #fff; border-bottom: 1px solid rgba(255,255,255,.5); }
.cta__value a:hover { border-bottom-color: #fff; }

/* ---------- 页脚 ---------- */
.footer { background: #0a1730; color: #cdd8ec; padding: 38px 0; }
.footer__inner { display: flex; flex-direction: column; gap: 8px; align-items: center; text-align: center; }
.footer__brand { display: flex; align-items: center; gap: 10px; color: #fff; font-weight: 800; font-size: 17px; }
.footer__logo { height: 30px; width: 30px; display: block; }
.footer__copy { font-size: 14px; }
.footer__beian { font-size: 12px; color: #8ea2c4; }

/* ---------- 滚动入场动画（渐进增强：无 JS 时保持可见） ---------- */
.reveal { opacity: 1; }
.js .reveal { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.js .reveal.is-visible { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .cards { grid-template-columns: 1fr; }
  .product__grid { grid-template-columns: 1fr; gap: 28px; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .caps { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .nav__menu {
    position: fixed; inset: 62px 0 auto 0;
    flex-direction: column; gap: 0;
    background: #fff; border-bottom: 1px solid var(--line);
    box-shadow: 0 14px 30px rgba(15,27,45,.12);
    transform: translateY(-120%); transition: transform .3s ease; padding: 8px 0;
  }
  .nav__menu.is-open { transform: translateY(0); }
  .nav__link { padding: 14px 24px; border-bottom: 1px solid var(--line); }
  .nav__link::after { display: none; }
  .nav__cta { margin: 10px 24px 14px; }
  .nav__toggle { display: flex; }
  .nav__brand-img { height: 34px; width: 34px; }
  .nav__brand-text { font-size: 18px; }
  .section { padding: 66px 0; }
  .hero__inner { padding: 96px 22px 110px; }
  .cta__panel { padding: 40px 22px; }
}
@media (max-width: 480px) {
  .steps { grid-template-columns: 1fr; }
  .container { padding: 0 18px; }
}

@media (prefers-reduced-motion: reduce) {
  .js .reveal { opacity: 1; transform: none; transition: none; }
  .hero__scroll span { animation: none; }
  html { scroll-behavior: auto; }
}