/* 重置样式 */
:root {
  --primary-color: #2c5282;  /* 深蓝色 */
  --secondary-color: #4299e1; /* 亮蓝色 */
  --accent-color: #38b2ac;   /* 青绿色 */
  --text-color: #2d3748;     /* 深灰色 */
  --light-bg: #f7fafc;       /* 浅灰色背景 */
  --white: #ffffff;
  --gradient-primary: linear-gradient(135deg, #2c5282 0%, #4299e1 100%);
  --gradient-accent: linear-gradient(135deg, #38b2ac 0%, #4fd1c5 100%);
  --box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --transition: all 0.3s ease;
}

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

body {
  font-family: 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--light-bg);
  overflow-x: hidden;
}

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

/* 弹性布局工具类 */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.flex-wrap { flex-wrap: wrap; }

/* 网格布局 */
.grid {
  display: grid;
  gap: 30px;
}

.grid-cols-1 { grid-template-columns: 1fr; }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

/* 间距工具类 */
.m-1 { margin: 0.25rem; }
.m-2 { margin: 0.5rem; }
.m-4 { margin: 1rem; }
.m-8 { margin: 2rem; }
.p-1 { padding: 0.25rem; }
.p-2 { padding: 0.5rem; }
.p-4 { padding: 1rem; }
.p-8 { padding: 2rem; }
.py-4 { padding-top: 1rem; padding-bottom: 1rem; }
.py-8 { padding-top: 2rem; padding-bottom: 2rem; }
.py-16 { padding-top: 4rem; padding-bottom: 4rem; }
.px-4 { padding-left: 1rem; padding-right: 1rem; }
.px-8 { padding-left: 2rem; padding-right: 2rem; }

/* 文本工具类 */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.text-sm { font-size: 0.875rem; }
.text-base { font-size: 1rem; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }
.text-2xl { font-size: 1.5rem; }
.text-3xl { font-size: 1.875rem; }
.text-4xl { font-size: 2.25rem; }
.text-5xl { font-size: 3rem; }
.font-bold { font-weight: 700; }
.font-medium { font-weight: 500; }
.font-light { font-weight: 300; }

/* 颜色工具类 */
.text-primary { color: var(--primary-color); }
.text-secondary { color: var(--secondary-color); }
.text-accent { color: var(--accent-color); }
.text-white { color: var(--white); }
.bg-primary { background-color: var(--primary-color); }
.bg-secondary { background-color: var(--secondary-color); }
.bg-accent { background-color: var(--accent-color); }
.bg-light { background-color: var(--light-bg); }
.bg-white { background-color: var(--white); }
.bg-gradient-primary { background: var(--gradient-primary); }
.bg-gradient-accent { background: var(--gradient-accent); }

/* 按钮样式 */
.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 4px;
  font-weight: 500;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  outline: none;
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 100%;
  background: rgba(255, 255, 255, 0.1);
  transition: var(--transition);
  z-index: -1;
}

.btn:hover::before {
  width: 100%;
}

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

.btn-secondary {
  background: var(--gradient-accent);
  color: var(--white);
  box-shadow: var(--box-shadow);
}

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

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

/* 卡片样式 */
.card {
  background: var(--white);
  border-radius: 8px;
  box-shadow: var(--box-shadow);
  transition: var(--transition);
  overflow: hidden;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.card-body {
  padding: 24px;
}

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--primary-color);
}

/* 响应式工具类 */
@media (min-width: 640px) {
  .sm\:grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
  .sm\:grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
  .sm\:grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
  .sm\:flex { display: flex; }
  .sm\:hidden { display: none; }
}

@media (min-width: 768px) {
  .md\:grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
  .md\:grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
  .md\:grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
  .md\:flex { display: flex; }
  .md\:hidden { display: none; }
}

@media (min-width: 1024px) {
  .lg\:grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
  .lg\:grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
  .lg\:grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
  .lg\:flex { display: flex; }
  .lg\:hidden { display: none; }
}

/* 无障碍支持 */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* 动画类 */
.fade-in {
  animation: fadeIn 0.8s ease-in;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.slide-in {
  animation: slideIn 0.8s ease-out;
}

@keyframes slideIn {
  from { transform: translateY(30px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.scale-in {
  animation: scaleIn 0.8s ease-out;
}

@keyframes scaleIn {
  from { transform: scale(0.9); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

/* 导航栏样式 */
.navbar {
  background-color: var(--white);
  box-shadow: var(--box-shadow);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
}

.navbar-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  height: 70px;
}

.navbar-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  color: var(--primary-color);
  font-weight: 600;
  font-size: 1.25rem;
  padding-left: 1rem;
}

.navbar-logo img {
  height: 40px;
  margin-right: 0.5rem;
}

.navbar-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  margin-right: 0.5rem;
}

.navbar-menu {
  display: flex;
  gap: 2rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.navbar-menu > li {
  position: relative;
}

.navbar-menu a {
  color: var(--text-color);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
  padding: 0.5rem 1rem;
  border-radius: 4px;
  display: block;
}

.navbar-menu a:hover,
.navbar-menu a.active {
  color: var(--primary-color);
  background-color: rgba(66, 153, 225, 0.1);
}

/* 下拉菜单样式 */
.dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 200px;
  background-color: var(--white);
  box-shadow: var(--box-shadow);
  border-radius: 4px;
  padding: 0.5rem 0;
  z-index: 1000;
  list-style-type: none;
}

.dropdown-menu a {
  padding: 0.75rem 1.5rem;
  white-space: nowrap;
  border-radius: 0;
}

.dropdown-menu a:hover {
  background-color: rgba(66, 153, 225, 0.1);
}

.navbar-menu > li:hover .dropdown-menu {
  display: block;
}

/* 移动端导航样式 */
@media (max-width: 768px) {
  .navbar-container {
    padding: 0.5rem;
  }

  .navbar-toggle {
    display: block;
  }

  .navbar-menu {
    display: none;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background-color: var(--white);
    padding: 1rem;
    box-shadow: var(--box-shadow);
    flex-direction: column;
    gap: 0.5rem;
  }

  .navbar-menu.active {
    display: flex;
  }

  .navbar-menu a {
    display: block;
    padding: 0.75rem 1rem;
    border-radius: 4px;
  }

  .dropdown-menu {
    position: static;
    box-shadow: none;
    padding-left: 1.5rem;
    display: none;
  }

  .dropdown-menu.active {
    display: block;
  }

  .navbar-menu > li:hover .dropdown-menu {
    display: none;
  }

  .navbar-menu > li.active .dropdown-menu {
    display: block;
  }
}

/* 英雄区域样式 */
.hero {
  position: relative;
  min-height: 80vh;
  display: flex;
  align-items: center;
  color: var(--white);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(44, 82, 130, 0.9) 0%, rgba(66, 153, 225, 0.8) 100%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  line-height: 1.2;
}

.hero-subtitle {
  font-size: 1.5rem;
  margin-bottom: 2rem;
  max-width: 600px;
}

/* 服务卡片样式 */
.service-card {
  background: var(--white);
  border-radius: 8px;
  box-shadow: var(--box-shadow);
  transition: var(--transition);
  overflow: hidden;
  height: 100%;
}

.service-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.service-icon {
  width: 60px;
  height: 60px;
  background: var(--gradient-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--white);
  font-size: 24px;
}

.service-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--primary-color);
}

.service-description {
  color: var(--text-color);
  margin-bottom: 20px;
}

/* 页脚样式 */
.footer {
  background: var(--primary-color);
  color: var(--white);
  padding: 60px 0 30px;
}

.footer-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 20px;
}

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

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--white);
}

.footer-bottom {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.6);
}

/* 表单样式 */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--text-color);
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid #e2e8f0;
  border-radius: 4px;
  background-color: var(--white);
  transition: var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--secondary-color);
  box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.2);
}

.form-textarea {
  min-height: 150px;
  resize: vertical;
}

/* 科技元素 */
.tech-element {
  position: absolute;
  opacity: 0.1;
  z-index: 0;
}

.tech-circle {
  border-radius: 50%;
  background: var(--gradient-primary);
}

.tech-square {
  border-radius: 4px;
  background: var(--gradient-accent);
}

.tech-dots {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tech-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary-color);
}