/* 全局样式 */
:root {
  --primary-color: #6a11cb;
  --secondary-color: #2575fc;
  --accent-color: #ff6b6b;
  --text-color: #333;
  --light-bg: #f8f9fa;
  --dark-bg: #343a40;
  --transition: all 0.3s ease;
}

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

body {
  font-family: 'Roboto', sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  overflow-x: hidden;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 导航栏 */
header {
  background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
  color: white;
  padding: 1rem 0;
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
}

.logo img {
  height: 40px;
  margin-right: 10px;
}

.logo h1 {
  font-size: 1.5rem;
  font-weight: 700;
}

.nav-links {
  display: flex;
  list-style: none;
}

.nav-links li {
  margin-left: 2rem;
}

.nav-links a {
  color: white;
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
}

.nav-links a:hover {
  color: rgba(255, 255, 255, 0.8);
}

/* 英雄区 */
.hero {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: url('../images/quantum_entanglement_custom.png') no-repeat center center/cover;
  position: relative;
  color: white;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.hero h2 {
  font-size: 3rem;
  margin-bottom: 1rem;
  animation: fadeInUp 1s ease;
}

.hero p {
  font-size: 1.2rem;
  margin-bottom: 2rem;
  animation: fadeInUp 1s ease 0.2s;
  animation-fill-mode: both;
}

.btn {
  display: inline-block;
  background: var(--accent-color);
  color: white;
  padding: 0.8rem 1.5rem;
  border-radius: 30px;
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
  border: none;
  cursor: pointer;
  animation: fadeInUp 1s ease 0.4s;
  animation-fill-mode: both;
}

.btn:hover {
  background: #ff5252;
  transform: translateY(-3px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

/* 关于部分 */
.about {
  padding: 5rem 0;
  background-color: white;
}

.section-title {
  text-align: center;
  margin-bottom: 3rem;
}

.section-title h2 {
  font-size: 2.5rem;
  color: var(--primary-color);
  margin-bottom: 1rem;
}

.section-title p {
  color: #777;
  max-width: 600px;
  margin: 0 auto;
}

.about-content {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
}

.about-text {
  flex: 1;
  min-width: 300px;
  padding: 0 2rem;
}

.about-image {
  flex: 1;
  min-width: 300px;
  text-align: center;
}

.about-image img {
  max-width: 100%;
  border-radius: 10px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

/* 量子思维部分 */
.quantum-thinking {
  padding: 5rem 0;
  background-color: var(--light-bg);
}

.cards {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2rem;
  margin-top: 3rem;
}

.card {
  background: white;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  transition: var(--transition);
  width: 100%;
  max-width: 350px;
}

.card:hover {
  transform: translateY(-10px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.card-image {
  height: 200px;
  overflow: hidden;
}

.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.card:hover .card-image img {
  transform: scale(1.1);
}

.card-content {
  padding: 1.5rem;
}

.card-content h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--primary-color);
}

.card-content p {
  color: #777;
  margin-bottom: 1rem;
}

/* 应用案例部分 */
.applications {
  padding: 5rem 0;
  background-color: white;
}

.application-item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 4rem;
}

.application-item:nth-child(even) {
  flex-direction: row-reverse;
}

.application-image {
  flex: 1;
  min-width: 300px;
  padding: 1rem;
}

.application-image img {
  max-width: 100%;
  border-radius: 10px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.application-text {
  flex: 1;
  min-width: 300px;
  padding: 1rem;
}

.application-text h3 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
  color: var(--primary-color);
}

/* 行动号召部分 */
.cta {
  padding: 5rem 0;
  background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
  color: white;
  text-align: center;
}

.cta h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.cta p {
  margin-bottom: 2rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* 页脚 */
footer {
  background-color: var(--dark-bg);
  color: white;
  padding: 3rem 0;
  text-align: center;
}

.footer-content {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  margin-bottom: 2rem;
}

.footer-section {
  flex: 1;
  min-width: 250px;
  padding: 1rem;
}

.footer-section h3 {
  font-size: 1.3rem;
  margin-bottom: 1rem;
}

.footer-section p, .footer-section a {
  color: #ddd;
}

.footer-section a {
  display: block;
  margin-bottom: 0.5rem;
  text-decoration: none;
  transition: var(--transition);
}

.footer-section a:hover {
  color: white;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 1rem;
  text-align: center;
}

/* 动画 */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 响应式设计 */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .hero h2 {
    font-size: 2rem;
  }
  
  .about-content, .application-item, .application-item:nth-child(even) {
    flex-direction: column;
  }
  
  .about-text, .application-text {
    order: 2;
  }
  
  .about-image, .application-image {
    order: 1;
    margin-bottom: 2rem;
  }
}

/* 滚动动画 */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.active {
  opacity: 1;
  transform: translateY(0);
}