/* ====== 科技感公司演示风格重写 ====== */
html, body {
  height: 100%;
  margin: 0;
  padding: 0;
  font-family: 'Lato', 'Arial', sans-serif;
  background: linear-gradient(135deg, #181f2a 0%, #2b3560 100%);
  color: #eaf6ff;
  min-height: 100vh;
  overflow-x: hidden;
}

.logo, h1, h2, h3, h4 {
  font-family: 'Orbitron', 'Lato', Arial, sans-serif;
}

/* ===== 顶部导航 ===== */
.navbar {
  width: 100%;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 100;
  background: rgba(24,31,42,0.7);
  backdrop-filter: blur(12px);
  box-shadow: 0 4px 32px 0 rgba(0,0,0,0.18);
  padding: 18px 0;
  display: flex;
  justify-content: center;
  align-items: center;
  border-bottom: 1.5px solid rgba(80,120,255,0.12);
}
.navbar-center {
  display: flex;
  align-items: center;
  gap: 60px;
}
.logo {
  font-size: 1.7rem;
  font-weight: bold;
  color: #fff;
  letter-spacing: 2px;
  text-shadow: 0 0 16px #3a7cff, 0 2px 8px #0008;
  filter: drop-shadow(0 0 8px #3a7cff88);
}

.nav-links {
  display: flex;
  gap: 36px;
}
.nav-links a {
  color: #eaf6ff;
  font-weight: 600;
  font-size: 1.08rem;
  padding: 6px 18px;
  border-radius: 8px;
  transition: background 0.2s, color 0.2s, box-shadow 0.2s;
  position: relative;
}
.nav-links .active,
.nav-links a:hover {
  color: #fff;
  background: linear-gradient(90deg, #3a7cff 40%, #00eaff 100%);
  box-shadow: 0 0 12px #3a7cff88;
}

/* ===== Hero Section ===== */
.hero {
  position: relative;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(120deg, #1a2240 60%, #3a7cff 100%);
  overflow: hidden;
  margin-top: 70px;
}
.hero-bg {
  position: absolute;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.18;
  z-index: 1;
  filter: blur(2px) brightness(0.7) grayscale(0.2);
}
.hero-content {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  gap: 40px;
}
.hero-content > div {
  text-align: center;
  color: #fff;
}
.hero .side-img {
  width: 160px;
  height: 160px;
  border-radius: 24px;
  overflow: hidden;
  background: rgba(58,124,255,0.10);
  box-shadow: 0 0 32px #3a7cff44;
  animation: floatY 3.5s ease-in-out infinite alternate;
}
.hero .side-img.left { margin-right: 40px; animation-delay: 0s; }
.hero .side-img.right { margin-left: 40px; animation-delay: 1.2s; }
.hero .side-img img { width: 100%; height: 100%; object-fit: cover; }
@keyframes floatY {
  0% { transform: translateY(0); }
  100% { transform: translateY(-24px); }
}
.hero h1 {
  font-size: 2.8rem;
  margin: 0.5em 0;
  color: #fff;
  text-shadow: 0 0 24px #3a7cff, 0 2px 8px #0008;
  letter-spacing: 2px;
}
.hero .sub-title {
  font-size: 1.3rem;
  color: #00eaff;
  letter-spacing: 1px;
  margin-bottom: 0.5em;
  text-shadow: 0 0 8px #00eaff88;
}
.hero .desc {
  margin-bottom: 1.5em;
  color: #eaf6ff;
  opacity: 0.85;
}
.cta-btn {
  background: linear-gradient(90deg, #3a7cff 40%, #00eaff 100%);
  color: #fff;
  border: none;
  padding: 16px 36px;
  border-radius: 30px;
  font-size: 1.1rem;
  cursor: pointer;
  font-weight: bold;
  margin: 0 8px 8px 0;
  box-shadow: 0 0 24px #3a7cff44;
  transition: background 0.2s, box-shadow 0.2s, transform 0.2s;
  outline: none;
}
.cta-btn:hover {
  background: linear-gradient(90deg, #00eaff 40%, #3a7cff 100%);
  box-shadow: 0 0 32px #00eaff88;
  transform: translateY(-2px) scale(1.04);
}

/* ===== Features Section ===== */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: 260px 180px;
  gap: 24px;
  background: transparent;
  padding: 60px 10vw;
  margin-top: -80px;
  z-index: 2;
  position: relative;
}
.feature {
  background: rgba(24,31,42,0.7);
  border-radius: 20px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  box-shadow: 0 2px 32px #3a7cff22;
  padding: 24px;
  border: 1.5px solid rgba(58,124,255,0.18);
  transition: box-shadow 0.2s, transform 0.2s;
}
.feature:hover {
  box-shadow: 0 0 48px #00eaff88, 0 2px 32px #3a7cff22;
  transform: translateY(-6px) scale(1.03);
}
.feature.big {
  grid-row: 1 / span 2;
  background: linear-gradient(135deg, #3a7cff 60%, #00eaff 100%);
  color: #fff;
  align-items: flex-start;
  box-shadow: 0 0 48px #3a7cff88;
}
.feature.orange {
  background: linear-gradient(135deg, #00eaff 60%, #3a7cff 100%);
  color: #fff;
}
.feature.small {
  background: rgba(0,234,255,0.12);
  color: #3a7cff;
}
.feature img { width: 100%; height: 100%; object-fit: cover; border-radius: 16px; }
.feature-title { font-weight: bold; margin: 0.5em 0; font-size: 1.2rem; letter-spacing: 1px; }

/* ===== About Section ===== */
.about {
  display: flex;
  align-items: flex-start;
  gap: 48px;
  background: rgba(24,31,42,0.7);
  padding: 80px 10vw;
  border-radius: 32px;
  margin: 60px 5vw 0 5vw;
  box-shadow: 0 0 48px #3a7cff22;
}
.about-img img { width: 320px; border-radius: 24px; box-shadow: 0 0 32px #00eaff44; }
.about-content { max-width: 600px; }
.section-subtitle {
  color: #00eaff;
  font-weight: bold;
  letter-spacing: 1px;
  font-size: 1.1rem;
}
.about-img-small img { width: 180px; border-radius: 16px; margin: 24px 0; box-shadow: 0 0 16px #3a7cff44; }
.read-more {
  background: none;
  border: 2px solid #00eaff;
  color: #00eaff;
  padding: 10px 28px;
  border-radius: 30px;
  font-size: 1rem;
  cursor: pointer;
  margin-top: 16px;
  transition: background 0.2s, color 0.2s, box-shadow 0.2s;
  box-shadow: 0 0 16px #00eaff22;
}
.read-more:hover {
  background: #00eaff;
  color: #181f2a;
  box-shadow: 0 0 32px #00eaff88;
}

/* ===== Services Section ===== */
.services {
  background: linear-gradient(90deg, #181f2a 60%, #3a7cff 100%);
  padding: 80px 0;
  color: #fff;
  text-align: center;
  position: relative;
}
.service-list {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-top: 40px;
}
.service-item {
  background: rgba(24,31,42,0.7);
  color: #00eaff;
  border-radius: 20px;
  padding: 32px 24px;
  width: 320px;
  box-shadow: 0 2px 32px #3a7cff22;
  text-align: left;
  position: relative;
  border: 1.5px solid rgba(0,234,255,0.18);
  transition: box-shadow 0.2s, transform 0.2s;
}
.service-item:hover {
  box-shadow: 0 0 32px #00eaff88;
  transform: translateY(-4px) scale(1.03);
}
.service-item span {
  font-size: 2rem;
  font-weight: bold;
  color: #3a7cff;
  position: absolute;
  left: 24px;
  top: 24px;
}

/* ===== Process Section ===== */
.process {
  display: flex;
  align-items: center;
  background: linear-gradient(90deg, #3a7cff 60%, #181f2a 100%);
  color: #fff;
  padding: 80px 10vw;
  gap: 48px;
  border-radius: 32px;
  margin: 60px 5vw 0 5vw;
  box-shadow: 0 0 48px #00eaff22;
}
.process-img img { width: 400px; border-radius: 24px; box-shadow: 0 0 32px #00eaff44; }
.process-steps > div {
  background: rgba(24,31,42,0.7);
  border-radius: 20px;
  padding: 24px 32px;
  margin-bottom: 24px;
  box-shadow: 0 0 16px #3a7cff22;
  border: 1.5px solid rgba(58,124,255,0.12);
  transition: box-shadow 0.2s, transform 0.2s;
}
.process-steps > div:hover {
  box-shadow: 0 0 32px #00eaff88;
  transform: translateY(-2px) scale(1.02);
}
.process-steps h4 { margin: 0.5em 0; }

/* ===== Testimonials Section ===== */
.testimonials {
  display: flex;
  align-items: flex-start;
  gap: 48px;
  background: rgba(24,31,42,0.7);
  padding: 80px 10vw;
  border-radius: 32px;
  margin: 60px 5vw 0 5vw;
  box-shadow: 0 0 48px #3a7cff22;
}
.testimonial-list {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 32px;
}
.testimonial {
  background: rgba(58,124,255,0.10);
  border-radius: 20px;
  padding: 32px;
  box-shadow: 0 2px 32px #3a7cff22;
  font-size: 1.1rem;
  color: #00eaff;
  border: 1.5px solid rgba(0,234,255,0.18);
  transition: box-shadow 0.2s, transform 0.2s;
}
.testimonial:hover {
  box-shadow: 0 0 32px #00eaff88;
  transform: translateY(-2px) scale(1.02);
}
.testimonial span {
  display: block;
  margin-top: 16px;
  font-weight: bold;
  color: #3a7cff;
}
.testimonial-desc {
  flex: 1;
  padding-left: 40px;
}

/* ===== CTA Banner ===== */
.cta-banner {
  position: relative;
  width: 100%;
  min-height: 380px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(90deg, #3a7cff 60%, #181f2a 100%);
  color: #fff;
  padding: 80px 0 60px 0;
  box-sizing: border-box;
  overflow: hidden;
  border-radius: 32px;
  margin: 60px 0 0 0;
  box-shadow: 0 0 48px #00eaff22;
}
.cta-img {
  width: 140px;
  height: 140px;
  border-radius: 20px;
  overflow: hidden;
  background: rgba(58,124,255,0.12);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
  box-shadow: 0 0 32px #3a7cff44;
}
.cta-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.cta-img.left { margin-right: 48px; }
.cta-img.right { margin-left: 48px; }
.cta-content {
  flex: 1 1 0;
  max-width: 700px;
  text-align: center;
  z-index: 3;
  margin: 0 24px;
}
.cta-content h2 {
  font-size: 2.4rem;
  font-weight: bold;
  margin: 18px 0 18px 0;
  line-height: 1.2;
  text-shadow: 0 0 24px #00eaff88;
}
.cta-content p {
  font-size: 1.15rem;
  margin-bottom: 32px;
}

/* ===== Footer ===== */
footer {
  background: rgba(24,31,42,0.7);
  color: #00eaff;
  text-align: center;
  padding: 32px 0 16px 0;
  border-top: 1.5px solid rgba(0,234,255,0.12);
  box-shadow: 0 -2px 32px #3a7cff22;
}
.footer-links {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-bottom: 12px;
}
.footer-links a { color: #00eaff; }
.footer-links .active { color: #3a7cff; }

/* ===== Back to Top Button ===== */
#backToTop {
  position: fixed;
  right: 32px;
  bottom: 32px;
  background: linear-gradient(90deg, #3a7cff 40%, #00eaff 100%);
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 48px;
  height: 48px;
  font-size: 1.5rem;
  cursor: pointer;
  display: none;
  z-index: 200;
  box-shadow: 0 0 24px #00eaff88;
  transition: background 0.2s, box-shadow 0.2s, transform 0.2s;
}
#backToTop.show {
  display: block;
  animation: fadeIn 0.5s;
}
#backToTop:hover {
  background: linear-gradient(90deg, #00eaff 40%, #3a7cff 100%);
  box-shadow: 0 0 32px #3a7cff88;
  transform: scale(1.08);
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ===== 响应式 ===== */
@media (max-width: 1200px) {
  .features, .about, .process, .testimonials {
    padding: 40px 2vw;
  }
}
@media (max-width: 900px) {
  .features {
    grid-template-columns: 1fr;
    grid-template-rows: none;
    gap: 18px;
    padding: 32px 2vw;
    margin-top: 0;
  }
  .about, .process, .testimonials, .cta-banner {
    flex-direction: column;
    gap: 24px;
    padding: 32px 2vw;
    margin: 32px 2vw 0 2vw;
    border-radius: 18px;
  }
  .about-img img, .process-img img {
    width: 100%;
    max-width: 320px;
    margin: 0 auto;
  }
  .cta-img.left, .cta-img.right {
    margin: 0 0 24px 0;
  }
  .cta-content {
    margin: 0;
    max-width: 95vw;
  }
}
@media (max-width: 600px) {
  .navbar-center { flex-direction: column; gap: 18px; }
  .hero-content { flex-direction: column; gap: 18px; }
  .side-img { width: 100px; height: 100px; }
  .about-img img, .process-img img { max-width: 90vw; }
  .service-list { flex-direction: column; gap: 18px; }
}