/* ==================== 全局基础样式 ==================== */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

/* 全局科技渐变背景 */
body {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #334155 100%);
  min-height: 100vh;
  padding: 10px 0;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 12px;
}

/* 炫酷渐变标题 */
h1 {
  text-align: center;
  background: linear-gradient(90deg, #00d4ff, #0099ff, #7b61ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 20px;
  text-shadow: 0 0 20px rgba(0, 153, 255, 0.3);
}

h3 {
  color: #fff;
  margin-bottom: 12px;
  font-size: 16px;
  font-weight: 600;
}

h4 {
  color: #a5b4fc;
  margin-bottom: 10px;
  font-size: 14px;
  font-weight: 500;
}

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