:root {
  /* 主题颜色 */
  --dark-bg-primary: #111111;
  --dark-bg-secondary: #1a1a1a;
  --dark-bg-card: #252525;
  --dark-bg-hover: #2a2a2a;
  --dark-accent: #0066ff;
  
  /* 文字颜色 */
  --dark-text-primary: rgba(255, 255, 255, 0.95);
  --dark-text-secondary: rgba(255, 255, 255, 0.7);
  --dark-text-muted: rgba(255, 255, 255, 0.5);
  
  /* 边框和阴影 */
  --dark-border: rgba(255, 255, 255, 0.1);
  --dark-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --dark-glow: 0 0 20px rgba(0, 102, 255, 0.2);
}

/* 基础样式 */
body {
  background-color: var(--dark-bg-primary);
  color: var(--dark-text-primary);
}

/* 导航栏样式 */
.navbar {
  background-color: rgba(26, 26, 26, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--dark-border);
}

.navbar-brand {
  color: var(--dark-text-primary);
}

.nav-link {
  color: var(--dark-text-secondary);
  transition: color 0.3s ease;
}

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

/* Hero Banner */
.hero {
  background: linear-gradient(45deg, var(--dark-bg-primary), var(--dark-bg-secondary));
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 50% 50%, var(--dark-accent) 0%, transparent 50%);
  opacity: 0.1;
}

/* 卡片样式 */
.card {
  background-color: var(--dark-bg-card);
  border: 1px solid var(--dark-border);
  box-shadow: var(--dark-shadow);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--dark-glow);
}

/* 按钮样式 */
.btn-primary {
  background-color: var(--dark-accent);
  border: none;
  padding: 0.75rem 1.5rem;
  transition: all 0.3s ease;
}

.btn-primary:hover {
  background-color: rgba(0, 102, 255, 0.8);
  transform: translateY(-2px);
}

/* 功能展示区域 */
.feature-section {
  background-color: var(--dark-bg-secondary);
  padding: 4rem 0;
}

/* 版本对比卡片 */
.pricing-card {
  background-color: var(--dark-bg-card);
  border-radius: 15px;
  padding: 2rem;
}

.pricing-card.highlighted {
  border: 2px solid var(--dark-accent);
  transform: scale(1.05);
}

/* 客户案例 */
.case-study {
  background-color: var(--dark-bg-secondary);
}

.client-logo {
  filter: brightness(0.8);
  transition: filter 0.3s ease;
}

.client-logo:hover {
  filter: brightness(1);
}

/* 页脚 */
footer {
  background-color: var(--dark-bg-secondary);
  border-top: 1px solid var(--dark-border);
  padding: 3rem 0;
}

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

.animate-fade-in {
  animation: fadeIn 0.8s ease forwards;
}

/* 响应式调整 */
@media (max-width: 768px) {
  .pricing-card.highlighted {
    transform: scale(1);
  }
  
  .hero {
    padding: 2rem 0;
  }
}