/* ===== 公共样式 ===== */
:root {
  --cyan: #00f0ff;
  --blue: #0066ff;
  --purple: #a855f7;
  --dark-bg: #05071a;
  --glass: rgba(10, 15, 30, 0.78);
  --glass-border: rgba(0, 240, 255, 0.35);
}

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

body {
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  background:
    radial-gradient(circle at 12% 12%, rgba(0, 240, 255, 0.14), transparent 26%),
    radial-gradient(circle at 88% 8%, rgba(168, 85, 247, 0.12), transparent 28%),
    linear-gradient(180deg, #05071a 0%, #08142e 45%, #05071a 100%);
  color: #fff;
  min-height: 100vh;
  overflow-x: hidden;
}

.tech-bg {
  position: fixed;
  inset: 0;
  z-index: -3;
  background-image:
    radial-gradient(circle at 20% 20%, rgba(0, 240, 255, 0.16) 0, transparent 45%),
    radial-gradient(circle at 80% 10%, rgba(168, 85, 247, 0.12) 0, transparent 40%),
    linear-gradient(rgba(0, 240, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 240, 255, 0.06) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 50px 50px, 50px 50px;
  pointer-events: none;
}

.particles {
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
}
.particle {
  position: absolute;
  width: 2px;
  height: 2px;
  background: var(--cyan);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--cyan);
  animation: float 20s infinite ease-in-out;
}
@keyframes float {
  0% { transform: translateY(100vh) translateX(0); opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { transform: translateY(-10vh) translateX(20px); opacity: 0; }
}

/* ===== 导航栏 ===== */
nav {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 99;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 40px;
  background: linear-gradient(180deg, rgba(5, 7, 26, 0.96), rgba(5, 7, 26, 0.4));
  border-bottom: 1px solid rgba(0, 240, 255, 0.18);
  backdrop-filter: blur(10px);
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo-icon {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--cyan), var(--blue));
  box-shadow: 0 0 18px rgba(0, 240, 255, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
}
.logo-text {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.5px;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-links a {
  color: rgba(255, 255, 255, 0.75);
  text-decoration: none;
  font-size: 15px;
  transition: 0.3s;
  position: relative;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--cyan);
  text-shadow: 0 0 8px rgba(0, 240, 255, 0.8);
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--blue));
  transition: 0.3s;
}
.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

/* ===== 通用按钮 ===== */
.btn-cyan {
  border: none;
  padding: 12px 28px;
  border-radius: 999px;
  background: linear-gradient(90deg, #00a8ff, var(--cyan));
  color: #000;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 0 22px rgba(0, 240, 255, 0.5);
  transition: 0.3s;
  display: inline-block;
  text-align: center;
}
.btn-cyan:hover {
  transform: translateY(-3px);
  box-shadow: 0 0 35px rgba(0, 240, 255, 0.75);
}

/* ===== 底部流程模块 ===== */
.flow-wrapper {
  width: 90%;
  max-width: 1400px;
  margin: 0 auto 80px auto;
}
.flow-section {
  padding: 50px 40px;
  border-radius: 20px;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(12px);
  position: relative;
  overflow: hidden;
  width: 100%;
}
.flow-line {
  position: absolute;
  top: 50%;
  left: 8%;
  right: 8%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan), var(--blue), var(--cyan), transparent);
  opacity: 0.65;
  box-shadow: 0 0 12px var(--cyan);
  transform: translateY(-50%);
}
.flow-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 24px;
  position: relative;
  z-index: 2;
  width: 100%;
}
.flow-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}
.flow-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: rgba(0, 240, 255, 0.08);
  border: 1px solid rgba(0, 240, 255, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
  box-shadow: 0 0 18px rgba(0, 240, 255, 0.12);
}
.flow-icon svg {
  width: 24px;
  height: 24px;
  stroke: var(--cyan);
  filter: drop-shadow(0 0 6px var(--cyan));
}
.flow-item h5 {
  font-size: 15px;
  margin-bottom: 6px;
  color: #fff;
}
.flow-item p {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.65);
  line-height: 1.5;
}

/* ===== 公共响应式 ===== */
@media (max-width: 1100px) {
  .flow-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}
@media (max-width: 720px) {
  nav {
    flex-direction: column;
    gap: 12px;
    padding: 16px 20px;
  }
  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 18px;
  }
  .flow-wrapper {
    width: 95%;
    margin: 0 auto 40px auto;
  }
  .flow-section {
    padding: 30px 20px;
  }
  .flow-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}