:root {
  --navy-900: #061228;
  --navy-800: #0a1f3c;
  --navy-700: #0d2a52;
  --blue-500: #1f6fff;
  --blue-400: #3a8bff;
  --cyan-400: #22d3ff;
  --cyan-300: #5ce1ff;
  --text: #eaf2ff;
  --text-dim: #9fb4d4;
  --card-bg: rgba(255, 255, 255, 0.04);
  --card-border: rgba(99, 160, 255, 0.18);
  --glow: 0 0 40px rgba(34, 211, 255, 0.25);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", sans-serif;
  background: var(--navy-900);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}

#particles {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

/* 全局内容置于粒子之上 */
header, section, footer { position: relative; z-index: 1; }

/* ===== 导航 ===== */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  transition: background 0.3s, backdrop-filter 0.3s, border-color 0.3s;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(6, 18, 40, 0.82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--card-border);
}
.nav-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.logo-mark {
  width: 38px; height: 38px;
  display: grid; place-items: center;
  border-radius: 10px;
  font-weight: 800; font-size: 15px;
  color: #fff;
  background: linear-gradient(135deg, var(--blue-500), var(--cyan-400));
  box-shadow: var(--glow);
}
.logo-text { font-size: 19px; font-weight: 700; letter-spacing: 1px; }
.nav-links { display: flex; gap: 30px; }
.nav-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 15px;
  transition: color 0.2s;
  position: relative;
}
.nav-links a::after {
  content: "";
  position: absolute; left: 0; bottom: -6px;
  width: 0; height: 2px;
  background: var(--cyan-400);
  transition: width 0.25s;
}
.nav-links a:hover { color: #fff; }
.nav-links a:hover::after { width: 100%; }
.nav-cta {
  padding: 9px 20px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--blue-500), var(--cyan-400));
  color: #fff; text-decoration: none; font-size: 14px; font-weight: 600;
  box-shadow: var(--glow);
  transition: transform 0.2s;
}
.nav-cta:hover { transform: translateY(-2px); }
.nav-toggle {
  display: none;
  background: none; border: none; color: #fff; font-size: 24px; cursor: pointer;
}

/* ===== 首屏 ===== */
.hero {
  min-height: 100vh;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  text-align: center;
  padding: 120px 24px 60px;
  background:
    radial-gradient(900px 500px at 50% -10%, rgba(31, 111, 255, 0.25), transparent 60%),
    radial-gradient(700px 400px at 85% 20%, rgba(34, 211, 255, 0.12), transparent 60%);
}
.badge {
  display: inline-block;
  padding: 7px 18px;
  border: 1px solid var(--card-border);
  border-radius: 999px;
  font-size: 13px; letter-spacing: 2px;
  color: var(--cyan-300);
  background: rgba(34, 211, 255, 0.06);
  margin-bottom: 28px;
}
.hero-title {
  font-size: clamp(34px, 6vw, 64px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: 1px;
}
.gradient-text {
  background: linear-gradient(120deg, var(--blue-400), var(--cyan-400));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-sub {
  max-width: 680px;
  margin: 26px auto 0;
  color: var(--text-dim);
  font-size: clamp(15px, 2vw, 18px);
}
.hero-actions { margin-top: 38px; display: flex; gap: 16px; flex-wrap: wrap; justify-content: center; }
.btn {
  padding: 13px 30px;
  border-radius: 999px;
  text-decoration: none;
  font-size: 15px; font-weight: 600;
  transition: transform 0.2s, box-shadow 0.2s;
  cursor: pointer; border: none;
}
.btn-primary {
  background: linear-gradient(135deg, var(--blue-500), var(--cyan-400));
  color: #fff;
  box-shadow: var(--glow);
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 0 55px rgba(34, 211, 255, 0.45); }
.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--card-border);
}
.btn-ghost:hover { border-color: var(--cyan-400); color: var(--cyan-300); }
.btn.full { width: 100%; }
.hero-stats {
  margin-top: 64px;
  display: flex; gap: 56px; flex-wrap: wrap; justify-content: center;
}
.stat { text-align: center; }
.stat-num {
  display: block;
  font-size: 42px; font-weight: 800;
  background: linear-gradient(135deg, var(--blue-400), var(--cyan-400));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.stat-label { font-size: 14px; color: var(--text-dim); }
.scroll-hint {
  position: absolute; bottom: 28px; left: 50%; transform: translateX(-50%);
  font-size: 22px; color: var(--cyan-300);
  animation: bounce 1.8s infinite;
}
@keyframes bounce { 0%,100%{transform:translate(-50%,0);} 50%{transform:translate(-50%,10px);} }

/* ===== 通用区块 ===== */
.section { max-width: 1180px; margin: 0 auto; padding: 110px 24px; }
.section-alt {
  max-width: none;
  background: linear-gradient(180deg, rgba(13, 42, 82, 0.35), rgba(6, 18, 40, 0));
  border-top: 1px solid var(--card-border);
  border-bottom: 1px solid var(--card-border);
}
.section-alt > * { max-width: 1180px; margin-left: auto; margin-right: auto; }
.section-head { text-align: center; margin-bottom: 60px; }
.eyebrow {
  font-size: 13px; letter-spacing: 3px; color: var(--cyan-400); font-weight: 700;
}
.section-head h2 {
  font-size: clamp(26px, 4vw, 40px);
  margin: 12px 0 18px;
  font-weight: 800;
}
.lead { max-width: 760px; margin: 0 auto; color: var(--text-dim); font-size: 16px; }

/* ===== 关于 ===== */
.about-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.about-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 34px 28px;
  text-align: center;
}
.about-icon {
  font-size: 30px; color: var(--cyan-400); margin-bottom: 14px;
}
.about-card h3 { font-size: 20px; margin-bottom: 10px; }
.about-card p { color: var(--text-dim); font-size: 15px; }

/* ===== 卡片网格 ===== */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 22px; }
.card {
  position: relative;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 30px 26px;
  overflow: hidden;
  transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
}
.card::before {
  content: "";
  position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--blue-500), var(--cyan-400));
  transform: scaleX(0); transform-origin: left; transition: transform 0.3s;
}
.card:hover {
  transform: translateY(-6px);
  border-color: rgba(34, 211, 255, 0.5);
  box-shadow: 0 18px 50px rgba(8, 30, 70, 0.6);
}
.card:hover::before { transform: scaleX(1); }
.card-tag {
  display: inline-block;
  font-size: 12px; font-weight: 700; letter-spacing: 1px;
  color: var(--cyan-300);
  background: rgba(34, 211, 255, 0.1);
  border: 1px solid var(--card-border);
  padding: 4px 12px; border-radius: 6px;
  margin-bottom: 16px;
}
.card h3 { font-size: 19px; margin-bottom: 12px; }
.card p { color: var(--text-dim); font-size: 15px; }

/* ===== 优势 ===== */
.advantage-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.adv {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 30px 24px;
  transition: transform 0.3s, border-color 0.3s;
}
.adv:hover { transform: translateY(-6px); border-color: rgba(34, 211, 255, 0.5); }
.adv-no {
  font-size: 30px; font-weight: 800;
  background: linear-gradient(135deg, var(--blue-400), var(--cyan-400));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.adv h3 { font-size: 18px; margin: 10px 0 8px; }
.adv p { color: var(--text-dim); font-size: 14px; }

/* ===== 核心团队 ===== */
.team-companies {
  display: flex; flex-wrap: wrap; gap: 14px; justify-content: center;
  margin-bottom: 48px;
}
.company-chip {
  padding: 12px 24px;
  border-radius: 12px;
  border: 1px solid var(--card-border);
  background: var(--card-bg);
  font-size: 16px; font-weight: 600; color: var(--text);
  transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
}
.company-chip:hover {
  transform: translateY(-4px);
  border-color: rgba(34, 211, 255, 0.55);
  box-shadow: 0 12px 30px rgba(8, 30, 70, 0.5);
}
.team-points { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.tp {
  text-align: center;
  background: linear-gradient(135deg, rgba(13, 42, 82, 0.5), rgba(6, 18, 40, 0.2));
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 36px 24px;
  font-size: 40px; font-weight: 800;
}
.tp span {
  display: block;
  margin-top: 10px;
  font-size: 15px; font-weight: 400; color: var(--text-dim);
}
.tp:nth-child(1) { color: var(--blue-400); }
.tp:nth-child(2) { color: var(--cyan-400); }
.tp:nth-child(3) { color: var(--cyan-300); }

/* ===== 联系 ===== */
.contact { max-width: 1180px; }
.contact-inner {
  display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center;
  background: linear-gradient(135deg, rgba(13, 42, 82, 0.5), rgba(6, 18, 40, 0.2));
  border: 1px solid var(--card-border);
  border-radius: 24px;
  padding: 56px 48px;
}
.contact-text h2 { font-size: clamp(26px, 4vw, 38px); margin: 12px 0 16px; }
.contact-list { list-style: none; margin-top: 26px; }
.contact-list li {
  padding: 12px 0; border-bottom: 1px dashed rgba(99, 160, 255, 0.15);
  font-size: 15px; color: var(--text);
}
.contact-list span {
  display: inline-block; width: 64px; color: var(--cyan-400); font-weight: 700; margin-right: 12px;
}
.contact-form { display: flex; flex-direction: column; gap: 14px; }
.contact-form input, .contact-form textarea {
  width: 100%;
  padding: 14px 16px;
  border-radius: 10px;
  border: 1px solid var(--card-border);
  background: rgba(6, 18, 40, 0.6);
  color: var(--text);
  font-size: 15px;
  font-family: inherit;
  resize: vertical;
}
.contact-form input:focus, .contact-form textarea:focus {
  outline: none; border-color: var(--cyan-400);
  box-shadow: 0 0 0 3px rgba(34, 211, 255, 0.15);
}
.form-tip { font-size: 14px; color: var(--cyan-300); min-height: 18px; text-align: center; }

/* ===== 页脚 ===== */
.footer {
  text-align: center;
  padding: 32px 24px;
  color: var(--text-dim);
  font-size: 14px;
  border-top: 1px solid var(--card-border);
}
.icp { margin-top: 8px; font-size: 13px; color: rgba(159, 180, 212, 0.7); }

/* ===== 滚动揭示动画 ===== */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.7s, transform 0.7s; }
.reveal.in { opacity: 1; transform: none; }

/* ===== 响应式 ===== */
@media (max-width: 860px) {
  .nav-links { display: none; }
  .nav-toggle { display: block; }
  .nav-links.open {
    display: flex; flex-direction: column; gap: 18px;
    position: absolute; top: 70px; left: 0; right: 0;
    background: rgba(6, 18, 40, 0.96);
    padding: 24px; border-bottom: 1px solid var(--card-border);
  }
  .about-grid, .advantage-grid, .team-points { grid-template-columns: 1fr; }
  .contact-inner { grid-template-columns: 1fr; gap: 36px; padding: 40px 28px; }
  .hero-stats { gap: 32px; }
}