/* CSS变量定义 */
:root {
  /* 主色调 */
  --primary-color: #2e3192;
  --accent-color: #00c3ff;
  /* 辅助色 */
  --bg-white: #ffffff;
  --bg-light-gray: #f5f7fa;
  --text-dark: #333333;
  --text-light: #666666;
  /* 字体 */
  --font-family: 'Inter', 'Helvetica Neue', Arial, sans-serif;
  /* 阴影 */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
  /* 过渡效果 */
  --transition: all 0.3s ease;
  /* 间距 */
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  --spacing-xl: 48px;
  --spacing-xxl: 64px;
  /* 圆角 */
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 12px;
}

/* 全局样式重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-family);
  color: var(--text-dark);
  background-color: var(--bg-white);
  line-height: 1.6;
  overflow-x: hidden;
}

/* 链接样式 */
a {
  color: var(--primary-color);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--accent-color);
}

/* 按钮样式 */
.btn {
  display: inline-block;
  padding: 12px 24px;
  border: none;
  border-radius: var(--border-radius-md);
  font-weight: 600;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}

.btn-primary {
  background-color: var(--primary-color);
  color: white;
}

.btn-primary:hover {
  background-color: #1e2172;
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-accent {
  background-color: var(--accent-color);
  color: white;
}

.btn-accent:hover {
  background-color: #00a3d9;
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background-color: transparent;
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
}

.btn-outline:hover {
  background-color: var(--primary-color);
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* 容器样式 */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* 导航栏样式 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.95);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  padding: var(--spacing-sm) 0;
}

.navbar.scrolled {
  background-color: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-md);
  padding: var(--spacing-xs) 0;
}

.navbar-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
  display: flex;
  align-items: center;
}

.logo span {
  color: var(--accent-color);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
}

.nav-link {
  position: relative;
  color: var(--text-dark);
  font-weight: 500;
  padding: var(--spacing-xs) 0;
}

.nav-link:hover {
  color: var(--primary-color);
}

/* 下拉菜单 */
.dropdown {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  background-color: var(--bg-white);
  box-shadow: var(--shadow-md);
  border-radius: var(--border-radius-md);
  padding: var(--spacing-sm);
  min-width: 200px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: var(--transition);
  z-index: 1001;
}

.dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item {
  display: block;
  padding: var(--spacing-xs) var(--spacing-sm);
  color: var(--text-dark);
  border-radius: var(--border-radius-sm);
  transition: var(--transition);
}

.dropdown-item:hover {
  background-color: var(--bg-light-gray);
  color: var(--primary-color);
}

/* 移动端菜单按钮 */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-dark);
}

/* 英雄区域样式 */
.hero {
  padding: var(--spacing-xxl) 0;
  color: white;
  text-align: center;
  position: relative;
  overflow: hidden;
  margin-top: 80px;
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  background: linear-gradient(135deg, #0a0a23 0%, #1a1a40 50%, #0a0a23 100%);
  background-size: 200% 200%;
  animation: gradient-shift 15s ease infinite;
  overflow: hidden;
  position: relative;
}

.hero-cityscape {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 60%;
  background-image: url('https://trae-api-cn.mchost.guru/api/ide/v1/text_to_image?prompt=futuristic%20city%20skyline%20at%20night%2C%20tall%20glass%20skyscrapers%2C%20neon%20lights%2C%20technology%20district%2C%20professional%20corporate%20style%2C%20dark%20background%2C%20cinematic%20lighting&image_size=landscape_16_9');
  background-size: cover;
  background-position: center bottom;
  opacity: 0.6;
  animation: cityGlow 10s ease-in-out infinite alternate;
}

.hero-future-car {
  position: absolute;
  bottom: 10%;
  right: 10%;
  width: 300px;
  height: 150px;
  background-image: url('https://trae-api-cn.mchost.guru/api/ide/v1/text_to_image?prompt=futuristic%20electric%20car%2C%20sleek%20design%2C%20neon%20accents%2C%20autonomous%20driving%2C%20professional%20corporate%20style%2C%20dark%20background%2C%20cinematic%20lighting&image_size=landscape_4_3');
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  opacity: 0.7;
  animation: carDrive 30s linear infinite;
}

.hero-tech-grid {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
      linear-gradient(rgba(0, 255, 255, 0.1) 1px, transparent 1px),
      linear-gradient(90deg, rgba(0, 255, 255, 0.1) 1px, transparent 1px);
  background-size: 50px 50px;
  animation: gridMove 20s linear infinite;
}

.hero-particle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: rgba(0, 255, 255, 0.8);
  border-radius: 50%;
  pointer-events: none;
  z-index: 1;
}

/* 动画效果定义 */
@keyframes cityGlow {
  0% {
    filter: brightness(0.8) saturate(0.8);
  }
  100% {
    filter: brightness(1.2) saturate(1.2);
  }
}

@keyframes carDrive {
  0% {
    transform: translateX(120%) translateY(0);
    opacity: 0;
  }
  10% {
    opacity: 0.7;
  }
  90% {
    opacity: 0.7;
  }
  100% {
    transform: translateX(-120%) translateY(0);
    opacity: 0;
  }
}

@keyframes gridMove {
  0% {
    background-position: 0 0;
  }
  100% {
    background-position: 50px 50px;
  }
}

@keyframes particleFloat {
  0% {
    transform: translateY(100vh) translateX(0);
    opacity: 0;
  }
  10% {
    opacity: 0.8;
  }
  90% {
    opacity: 0.8;
  }
  100% {
    transform: translateY(-100px) translateX(100px);
    opacity: 0;
  }
}

@keyframes gradient-shift {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  line-height: 1.2;
}

.hero p {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-xl);
  opacity: 0.9;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.hero-buttons {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

/* 服务区域样式 */
.services {
  padding: var(--spacing-xxl) 0;
  background-color: var(--bg-white);
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.section-title h2 {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: var(--spacing-sm);
}

.section-title p {
  font-size: 1.125rem;
  color: var(--text-light);
  max-width: 800px;
  margin: 0 auto;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.service-card {
  background-color: var(--bg-white);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  text-align: center;
}

.service-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-lg);
}

.service-icon {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--spacing-md);
  font-size: 2rem;
  color: white;
}

.service-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: var(--spacing-sm);
}

.service-card p {
  color: var(--text-light);
  margin-bottom: var(--spacing-md);
}

/* 案例展示区域 */
.case-studies {
  padding: var(--spacing-xxl) 0;
  background-color: var(--bg-light-gray);
}

.case-studies-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.case-study-card {
  background-color: var(--bg-white);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.case-study-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-lg);
}

.case-study-image {
  width: 100%;
  height: 200px;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 2rem;
  font-weight: 600;
}

.case-study-content {
  padding: var(--spacing-lg);
}

.case-study-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: var(--spacing-sm);
}

.case-study-content p {
  color: var(--text-light);
  margin-bottom: var(--spacing-md);
}

/* 合作伙伴区域 */
.partners {
  padding: var(--spacing-xxl) 0;
  background-color: var(--bg-white);
}

.partners-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.partner-logo {
  background-color: var(--bg-light-gray);
  border-radius: var(--border-radius-md);
  padding: var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  height: 120px;
  transition: var(--transition);
}

.partner-logo:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-md);
  background-color: var(--bg-white);
}

.partner-logo img {
  max-width: 80%;
  max-height: 80%;
  opacity: 0.7;
  transition: var(--transition);
}

.partner-logo:hover img {
  opacity: 1;
}

/* 关于我们区域 */
.about {
  padding: var(--spacing-xxl) 0;
  background-color: var(--bg-light-gray);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
}

.about-text h3 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: var(--spacing-md);
}

.about-text p {
  color: var(--text-light);
  margin-bottom: var(--spacing-md);
  line-height: 1.6;
}

.about-image {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
  border-radius: var(--border-radius-lg);
  height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 3rem;
  font-weight: 700;
  box-shadow: var(--shadow-md);
}

/* 联系我们区域 */
.contact {
  padding: var(--spacing-xxl) 0;
  background-color: var(--bg-white);
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
}

.contact-info h3 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: var(--spacing-md);
}

.contact-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
  color: var(--text-light);
}

.contact-item i {
  color: var(--accent-color);
  font-size: 1.25rem;
}

.contact-form {
  background-color: var(--bg-light-gray);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
}

.form-group {
  margin-bottom: var(--spacing-md);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 500;
  color: var(--text-dark);
}

.form-input {
  width: 100%;
  padding: var(--spacing-sm);
  border: 1px solid #e0e0e0;
  border-radius: var(--border-radius-md);
  font-family: var(--font-family);
  font-size: 1rem;
  transition: var(--transition);
}

.form-input:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(0, 195, 255, 0.1);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

/* 页脚样式 */
.footer {
  background-color: var(--primary-color);
  color: white;
  padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-section h4 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: var(--accent-color);
}

.footer-section p {
  opacity: 0.8;
  margin-bottom: var(--spacing-md);
}

.footer-links {
  list-style: none;
}

.footer-link {
  margin-bottom: var(--spacing-sm);
}

.footer-link a {
  color: white;
  opacity: 0.8;
  transition: var(--transition);
}

.footer-link a:hover {
  opacity: 1;
  color: var(--accent-color);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-md);
  text-align: center;
  opacity: 0.8;
}

/* 响应式设计 */
@media (max-width: 992px) {
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .about-content,
  .contact-content {
    grid-template-columns: 1fr;
  }
  
  .nav-links {
    gap: var(--spacing-md);
  }
}

@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }
  
  .nav-links {
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    background-color: var(--bg-white);
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-lg) 0;
    box-shadow: var(--shadow-md);
    gap: var(--spacing-md);
    transform: translateY(-150%);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
  }
  
  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .dropdown-menu {
    position: static;
    box-shadow: none;
    border: 1px solid #e0e0e0;
    margin-top: var(--spacing-xs);
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .hero p {
    font-size: 1.125rem;
  }
  
  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .services-grid,
  .case-studies-grid {
    grid-template-columns: 1fr;
  }
  
  .section-title h2 {
    font-size: 2rem;
  }
}

@media (max-width: 576px) {
  .hero h1 {
    font-size: 1.75rem;
  }
  
  .hero p {
    font-size: 1rem;
  }
  
  .section-title h2 {
    font-size: 1.5rem;
  }
  
  .container {
    padding: 0 var(--spacing-sm);
  }
}

/* 动画效果 */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* 加载动画 */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: white;
  animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* 滚动条样式 */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-light-gray);
}

::-webkit-scrollbar-thumb {
  background: var(--primary-color);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-color);
}