:root {
  --navy-900: #070b1e;
  --navy-800: #0b1230;
  --navy-700: #111a3d;
  --blue-500: #3b82f6;
  --blue-400: #38bdf8;
  --purple-500: #7c3aed;
  --cyan-400: #22d3ee;
  --ink: #0f172a;
  --slate-600: #475569;
  --slate-500: #64748b;
  --slate-300: #cbd5e1;
  --slate-100: #f1f5f9;
  --bg: #ffffff;
  --bg-alt: #f7f9fc;
  --radius: 16px;
  --radius-lg: 22px;
  --shadow-sm: 0 4px 16px rgba(15, 23, 42, .06);
  --shadow-md: 0 18px 50px rgba(15, 23, 42, .10);
  --shadow-glow: 0 20px 60px rgba(59, 130, 246, .25);
  --maxw: 1160px;
  --font: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }

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

/* ---------- 滚动进度条 ---------- */
.scroll-progress {
  position: fixed; top: 0; left: 0; height: 3px; width: 0%;
  background: linear-gradient(90deg, var(--blue-400), var(--purple-500));
  z-index: 1000; transition: width .1s linear;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px; padding: 13px 26px; border-radius: 999px;
  font-weight: 600; font-size: 15px; cursor: pointer; border: 1px solid transparent;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease, color .2s;
  white-space: nowrap;
}
.btn--sm { padding: 9px 18px; font-size: 14px; }
.btn--block { width: 100%; }
.btn--primary {
  color: #fff;
  background: linear-gradient(135deg, var(--blue-500), var(--purple-500));
  box-shadow: var(--shadow-glow);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 24px 70px rgba(124, 58, 237, .35); }
.btn--outline { color: #fff; border-color: rgba(255,255,255,.35); background: rgba(255,255,255,.04); }
.btn--outline:hover { border-color: #fff; background: rgba(255,255,255,.12); }
.btn--ghost { color: var(--blue-500); background: rgba(59,130,246,.10); }
.btn--ghost:hover { background: rgba(59,130,246,.18); }

/* ---------- 导航 ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 900;
  transition: background .3s ease, box-shadow .3s ease, padding .3s ease;
  padding: 18px 0;
}
.nav.scrolled {
  background: rgba(7, 11, 30, .82);
  backdrop-filter: blur(14px);
  box-shadow: 0 1px 0 rgba(255,255,255,.06);
  padding: 12px 0;
}
.nav__inner { display: flex; align-items: center; justify-content: space-between; }
.brand { display: inline-flex; align-items: center; gap: 10px; }
.brand__text { font-weight: 800; font-size: 20px; letter-spacing: .5px; color: #fff; }
.brand__mark { display: inline-flex; }
.nav__links { display: flex; gap: 30px; }
.nav__links a {
  color: rgba(255,255,255,.82); font-size: 15px; font-weight: 500; position: relative; padding: 4px 0;
  transition: color .2s;
}
.nav__links a::after {
  content: ""; position: absolute; left: 0; bottom: -2px; height: 2px; width: 0;
  background: linear-gradient(90deg, var(--blue-400), var(--purple-500)); transition: width .25s;
}
.nav__links a:hover { color: #fff; }
.nav__links a:hover::after { width: 100%; }
.nav__actions { display: flex; align-items: center; gap: 14px; }
.lang-link {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .04em;
  color: #cbd5e1;
  padding: 7px 12px;
  border: 1px solid rgba(148,163,184,.35);
  border-radius: 999px;
  text-decoration: none;
  transition: .25s;
}
.lang-link:hover { color: #fff; border-color: rgba(124,58,237,.7); background: rgba(124,58,237,.12); }
.nav__toggle { display: none; flex-direction: column; gap: 5px; background: none; border: 0; cursor: pointer; padding: 6px; }
.nav__toggle span { width: 24px; height: 2px; background: #fff; border-radius: 2px; transition: .3s; }
.nav__toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle.open span:nth-child(2) { opacity: 0; }
.nav__toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero { position: relative; padding: 168px 0 110px; background: var(--navy-900); color: #fff; overflow: hidden; }
.hero__bg { position: absolute; inset: 0; }
.hero__glow { position: absolute; border-radius: 50%; filter: blur(90px); opacity: .55; }
.hero__glow--1 { width: 520px; height: 520px; background: radial-gradient(circle, var(--blue-500), transparent 70%); top: -120px; left: -80px; }
.hero__glow--2 { width: 480px; height: 480px; background: radial-gradient(circle, var(--purple-500), transparent 70%); bottom: -160px; right: -60px; }
.hero__grid {
  position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(circle at 50% 30%, #000 30%, transparent 80%);
}
.hero__inner { position: relative; z-index: 2; max-width: 860px; }
.eyebrow {
  display: inline-block; font-size: 13.5px; font-weight: 700; letter-spacing: 2px;
  color: var(--blue-400); text-transform: uppercase;
  padding: 7px 15px; border: 1px solid rgba(56,189,248,.35); border-radius: 999px;
  background: rgba(56,189,248,.08); margin-bottom: 22px;
}
.eyebrow--center { display: block; text-align: center; margin: 0 auto 16px; width: fit-content; }
.hero__title { font-size: clamp(34px, 5.4vw, 60px); line-height: 1.12; font-weight: 800; letter-spacing: -.5px; }
.grad-text {
  background: linear-gradient(120deg, var(--blue-400), var(--cyan-400) 40%, var(--purple-500));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero__sub { margin-top: 24px; font-size: clamp(16px, 2vw, 19px); color: rgba(255,255,255,.78); max-width: 660px; }
.hero__cta { margin-top: 38px; display: flex; gap: 16px; flex-wrap: wrap; }
.hero__stats { margin-top: 64px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.stat { border-top: 1px solid rgba(255,255,255,.12); padding-top: 16px; }
.stat__num { font-size: clamp(30px, 4vw, 44px); font-weight: 800; background: linear-gradient(120deg, var(--blue-400), var(--purple-500)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat__label { font-size: 14px; color: rgba(255,255,255,.65); margin-top: 4px; }

/* ---------- 行业标签条 ---------- */
.strip { background: var(--navy-800); color: #fff; padding: 26px 0; }
.strip__inner { display: flex; align-items: center; gap: 28px; flex-wrap: wrap; }
.strip__label { font-size: 14px; color: rgba(255,255,255,.55); letter-spacing: 1px; white-space: nowrap; }
.strip__tags { display: flex; gap: 12px; flex-wrap: wrap; }
.strip__tags li {
  font-size: 14px; padding: 7px 16px; border-radius: 999px;
  background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.10);
  color: rgba(255,255,255,.85);
}

/* ---------- 通用 section ---------- */
.section { padding: 100px 0; }
.section--alt { background: var(--bg-alt); }
.section__head { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.section__title { font-size: clamp(26px, 3.4vw, 38px); font-weight: 800; line-height: 1.25; letter-spacing: -.5px; margin-top: 8px; }
.section__lead { margin-top: 16px; color: var(--slate-600); font-size: 17px; }

/* ---------- 服务卡片 ---------- */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.card {
  background: #fff; border: 1px solid var(--slate-100); border-radius: var(--radius-lg);
  padding: 34px 30px; box-shadow: var(--shadow-sm); position: relative; overflow: hidden;
  transition: transform .3s ease, box-shadow .3s ease, border-color .3s;
}
.card::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 4px;
  background: linear-gradient(90deg, var(--blue-400), var(--purple-500));
  transform: scaleX(0); transform-origin: left; transition: transform .35s ease;
}
.card:hover { transform: translateY(-8px); box-shadow: var(--shadow-md); border-color: transparent; }
.card:hover::before { transform: scaleX(1); }
.card__icon {
  width: 56px; height: 56px; border-radius: 14px; display: grid; place-items: center; margin-bottom: 20px;
}
.card__icon--blue { background: rgba(59,130,246,.12); color: var(--blue-500); }
.card__icon--purple { background: rgba(124,58,237,.12); color: var(--purple-500); }
.card__icon--cyan { background: rgba(34,211,238,.14); color: var(--cyan-400); }
.card__title { font-size: 20px; font-weight: 700; margin-bottom: 12px; }
.card__desc { color: var(--slate-600); font-size: 15px; margin-bottom: 18px; }
.card__list { display: flex; flex-direction: column; gap: 11px; }
.card__list li { position: relative; padding-left: 26px; font-size: 14.5px; color: var(--slate-600); }
.card__list li::before {
  content: ""; position: absolute; left: 0; top: 8px; width: 9px; height: 9px; border-radius: 50%;
  background: linear-gradient(135deg, var(--blue-400), var(--purple-500));
}

/* ---------- 关于我们 ---------- */
.about { display: grid; grid-template-columns: 1fr 1.15fr; gap: 56px; align-items: center; }
.about__panel {
  background: linear-gradient(160deg, var(--navy-800), var(--navy-700));
  border-radius: var(--radius-lg); padding: 44px 38px; color: #fff; position: relative; overflow: hidden;
  box-shadow: var(--shadow-md); min-height: 320px; display: flex; flex-direction: column; justify-content: space-between;
}
.about__panel::after {
  content: ""; position: absolute; width: 280px; height: 280px; border-radius: 50%;
  background: radial-gradient(circle, rgba(124,58,237,.5), transparent 70%);
  bottom: -120px; right: -90px; filter: blur(20px);
}
.about__badge {
  font-size: 46px; font-weight: 900; letter-spacing: 3px;
  background: linear-gradient(120deg, var(--blue-400), var(--purple-500));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.about__lines { display: flex; flex-direction: column; gap: 12px; }
.about__lines span { height: 10px; border-radius: 6px; background: rgba(255,255,255,.10); }
.about__caption { font-size: 15px; color: rgba(255,255,255,.7); letter-spacing: 4px; }
.about__text { color: var(--slate-600); margin-top: 14px; font-size: 16px; }
.about__points { margin-top: 26px; display: flex; flex-direction: column; gap: 18px; }
.point { display: flex; gap: 14px; }
.point__dot { flex: 0 0 12px; width: 12px; height: 12px; border-radius: 50%; margin-top: 6px; background: linear-gradient(135deg, var(--blue-400), var(--purple-500)); }
.point strong { display: block; font-size: 16px; }
.point p { color: var(--slate-600); font-size: 14.5px; margin-top: 2px; }

/* ---------- 流程 ---------- */
.steps { display: grid; grid-template-columns: repeat(5, 1fr); gap: 18px; counter-reset: step; }
.step {
  background: #fff; border: 1px solid var(--slate-100); border-radius: var(--radius);
  padding: 28px 22px; position: relative; box-shadow: var(--shadow-sm); transition: transform .25s, box-shadow .25s;
}
.step:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.step__no {
  font-size: 30px; font-weight: 800; line-height: 1;
  background: linear-gradient(135deg, var(--blue-400), var(--purple-500));
  -webkit-background-clip: text; background-clip: text; color: transparent; margin-bottom: 14px;
}
.step__title { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.step__desc { font-size: 14px; color: var(--slate-600); }

/* ---------- 案例 ---------- */
.cases { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.case {
  background: #fff; border: 1px solid var(--slate-100); border-radius: var(--radius-lg);
  padding: 30px 30px; box-shadow: var(--shadow-sm); transition: transform .25s, box-shadow .25s, border-color .25s;
}
.case:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: rgba(59,130,246,.25); }
.case__top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.case__tag { font-size: 13px; font-weight: 700; color: var(--blue-500); background: rgba(59,130,246,.1); padding: 5px 13px; border-radius: 999px; }
.case__metric { font-size: 14px; font-weight: 700; color: var(--purple-500); }
.case__title { font-size: 19px; font-weight: 700; margin-bottom: 10px; }
.case__desc { color: var(--slate-600); font-size: 15px; }

/* ---------- CTA ---------- */
.cta { padding: 80px 0; background: linear-gradient(135deg, var(--navy-800), var(--navy-700)); }
.cta__inner {
  display: flex; align-items: center; justify-content: space-between; gap: 30px; flex-wrap: wrap;
  background: linear-gradient(120deg, rgba(59,130,246,.18), rgba(124,58,237,.18));
  border: 1px solid rgba(255,255,255,.12); border-radius: var(--radius-lg);
  padding: 44px 46px;
}
.cta__title { color: #fff; font-size: clamp(22px, 3vw, 30px); font-weight: 800; }
.cta__sub { color: rgba(255,255,255,.75); margin-top: 10px; font-size: 16px; }

/* ---------- 联系 ---------- */
.contact { display: grid; grid-template-columns: 1fr 1.1fr; gap: 56px; align-items: start; }
.contact__lead { color: var(--slate-600); margin-top: 16px; font-size: 16px; }
.contact__list { margin-top: 30px; display: flex; flex-direction: column; gap: 22px; }
.contact__list li { display: flex; gap: 16px; align-items: flex-start; }
.contact__ic {
  flex: 0 0 44px; width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center;
  background: rgba(59,130,246,.1); color: var(--blue-500); font-size: 18px;
}
.contact__list strong { display: block; font-size: 15px; }
.contact__list p { color: var(--slate-600); font-size: 14.5px; }

.contact__form {
  background: #fff; border: 1px solid var(--slate-100); border-radius: var(--radius-lg);
  padding: 34px; box-shadow: var(--shadow-sm);
  display: grid; grid-template-columns: 1fr 1fr; gap: 18px;
}
.field { display: flex; flex-direction: column; gap: 7px; }
.field--full { grid-column: 1 / -1; }
.field label { font-size: 14px; font-weight: 600; color: var(--slate-600); }
.field input, .field select, .field textarea {
  font-family: inherit; font-size: 15px; padding: 12px 14px; border: 1px solid var(--slate-300);
  border-radius: 11px; background: #fff; color: var(--ink); transition: border-color .2s, box-shadow .2s; resize: vertical;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--blue-500); box-shadow: 0 0 0 3px rgba(59,130,246,.15);
}
.contact__form .btn--block { grid-column: 1 / -1; margin-top: 4px; }
.form__hint { grid-column: 1 / -1; color: #16a34a; font-size: 14px; font-weight: 600; }

/* ---------- 页脚 ---------- */
.footer { background: var(--navy-900); color: #fff; padding: 64px 0 28px; }
.footer__inner { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 36px; padding-bottom: 40px; border-bottom: 1px solid rgba(255,255,255,.08); }
.brand--light .brand__text { color: #fff; }
.footer__slogan { margin-top: 16px; color: rgba(255,255,255,.6); font-size: 14.5px; line-height: 1.7; }
.footer__col h4 { font-size: 15px; margin-bottom: 16px; color: #fff; }
.footer__col a { display: block; color: rgba(255,255,255,.6); font-size: 14.5px; padding: 5px 0; transition: color .2s; }
.footer__col a:hover { color: var(--blue-400); }
.footer__bottom { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; padding-top: 24px; color: rgba(255,255,255,.45); font-size: 13.5px; }

/* ---------- 滚动揭示动画 ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .cards { grid-template-columns: 1fr; }
  .about { grid-template-columns: 1fr; gap: 36px; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .contact { grid-template-columns: 1fr; gap: 36px; }
  .footer__inner { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .nav__links {
    position: fixed; top: 64px; right: 16px; left: 16px; flex-direction: column; gap: 4px;
    background: rgba(11,18,48,.97); backdrop-filter: blur(14px); padding: 16px; border-radius: 16px;
    border: 1px solid rgba(255,255,255,.08); box-shadow: var(--shadow-md);
    transform: translateY(-12px); opacity: 0; pointer-events: none; transition: .25s;
  }
  .nav__links.open { transform: none; opacity: 1; pointer-events: auto; }
  .nav__links a { padding: 12px 8px; }
  .nav__toggle { display: flex; }
  .nav__actions .btn--ghost { display: none; }
  .hero { padding: 130px 0 80px; }
  .hero__stats { grid-template-columns: repeat(2, 1fr); gap: 18px; }
  .cases { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .section { padding: 72px 0; }
  .contact__form { grid-template-columns: 1fr; }
  .cta__inner { padding: 30px; }
}
@media (max-width: 480px) {
  .footer__inner { grid-template-columns: 1fr; }
}