html {
    scroll-behavior: smooth;
  }
  body {
    margin: 0;
    font-family: 'Inter', sans-serif;
    background: #f6f7f9;
    color: #2e2e2e;
  }
  .app-wrapper {
    display: flex;
    min-height: 100vh;
  }
  .sidebar {
    background: #1f1f1f;
    width: 80px;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px 0;
  }
  .sidebar-title {
    font-size: 28px;
    font-weight: bold;
    margin-bottom: 30px;
    color: #64ffda;
  }
  .icon {
    font-size: 22px;
    margin: 24px 0;
    color: #bbb;
    text-decoration: none;
    transition: all 0.2s ease;
  }
  .icon:hover, .icon:focus {
    color: #64ffda;
    transform: scale(1.2);
  }
  .main-content {
    flex: 1;
    padding: 40px 60px;
  }
  header {
    margin-bottom: 40px;
  }
  header h1 {
    font-size: 30px;
    margin: 0;
    color: #222;
  }
  header p {
    margin-top: 10px;
    color: #555;
    font-size: 16px;
  }
  .card {
    background: #ffffff;
    border-radius: 14px;
    padding: 30px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.05);
    margin-bottom: 40px;
  }
  .card h2 {
    margin-top: 0;
    font-size: 22px;
    color: #1e1e1e;
    margin-bottom: 20px;
  }
  .controls {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 24px;
  }
  select {
    padding: 12px 16px;
    border-radius: 10px;
    border: 1px solid #ccc;
    background: #f0f0f0;
    font-size: 15px;
  }
  .gauges {
    display: flex;
    flex-wrap: wrap;
    gap: 24px;
    justify-content: space-between;
  }
  #gauge-mean, #gauge-max, #gauge-min {
    flex: 1;
    min-width: 280px;
    max-width: 360px;
  }
  footer {
    margin-top: 50px;
    font-size: 14px;
    text-align: center;
    color: #999;
  }