/* 全局配置 */
:root {
  --color-primary: #0A1929;
  --color-secondary: #0066CC;
  --color-accent: #64B5F6;
  --color-text-dark: #1F2937;
  --color-text-light: #F9FAFB;
  --color-gray: #6B7280;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--color-primary);
  color: var(--color-text-light);
  line-height: 1.6;
  overflow-x: hidden;
}

/* 平滑滚动 */
html {
  scroll-behavior: smooth;
}

/* 导航栏 */
.nav-container {
  backdrop-filter: blur(10px);
  background: rgba(10, 25, 41, 0.9);
  border-bottom: 1px solid rgba(100, 181, 246, 0.1);
}

.nav-link {
  position: relative;
  transition: var(--transition);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: var(--transition);
  transform: translateX(-50%);
}

.nav-link:hover::after {
  width: 100%;
}

/* Hero区域 */
.hero-section {
  min-height: 100vh;
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  position: relative;
}

.hero-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10, 25, 41, 0.85) 0%, rgba(0, 102, 204, 0.3) 100%);
}

/* 卡片样式 */
.card {
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(100, 181, 246, 0.2);
  transition: var(--transition);
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(0, 102, 204, 0.3);
  border-color: var(--color-accent);
}

/* 按钮样式 */
.btn-primary {
  background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-accent) 100%);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-secondary) 100%);
  opacity: 0;
  transition: var(--transition);
}

.btn-primary:hover::before {
  opacity: 1;
}

.btn-primary span {
  position: relative;
  z-index: 1;
}

/* 数据展示区 */
.stat-number {
  font-size: 3rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* 页脚 */
footer {
  background: rgba(10, 25, 41, 0.95);
  border-top: 1px solid rgba(100, 181, 246, 0.1);
}

/* 响应式布局 */
@media (max-width: 768px) {
  .hero-section {
    background-attachment: scroll;
  }
  
  .stat-number {
    font-size: 2rem;
  }
  
  .card {
    margin-bottom: 1rem;
  }
}

/* 动画效果 */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in-up {
  animation: fadeInUp 0.8s ease-out;
}

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

::-webkit-scrollbar-track {
  background: var(--color-primary);
}

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

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

/* 图片加载效果 */
img {
  transition: var(--transition);
}

img:hover {
  transform: scale(1.02);
}

/* 时间线样式 */
.timeline-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: linear-gradient(180deg, var(--color-secondary) 0%, var(--color-accent) 100%);
}

/* 加载状态 */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(100, 181, 246, 0.3);
  border-radius: 50%;
  border-top-color: var(--color-accent);
  animation: spin 1s linear infinite;
}

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