:root {
  --primary-color: #409EFF;
  --secondary-color: #67C23A;
  --background-color: #f5f7fa;
  --text-color: #303133;
  --border-color: #dcdfe6;
  --success-color: #67C23A;
  --warning-color: #E6A23C;
  --error-color: #F56C6C;
  --transition: all 0.3s ease;
}

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

body {
  font-family: 'Helvetica Neue', Helvetica, 'PingFang SC', 'Hiragino Sans GB',
    'Microsoft YaHei', Arial, sans-serif;
  background-color: var(--background-color);
  color: var(--text-color);
  line-height: 1.5;
  min-height: 100vh;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

.card {
  background: white;
  border-radius: 12px;
  box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);
  padding: 2rem;
  margin-bottom: 2rem;
}

h1, h2, h3 {
  color: var(--text-color);
  margin-bottom: 1.5rem;
}

.input-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin: 1.5rem 0;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.input-field {
  padding: 0.8rem;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  font-size: 1rem;
  transition: var(--transition);
}

.input-field:focus {
  border-color: var(--primary-color);
  outline: none;
  box-shadow: 0 0 0 3px rgba(64, 158, 255, 0.1);
}

.nav-buttons {
  display: flex;
  gap: 1rem;
  margin: 1.5rem 0;
  justify-content: center;
}

.button-group {
  display: flex;
  gap: 1rem;
  margin: 1.5rem 0;
}

.button-link {
  display: inline-block;
  padding: 0.8rem 1.5rem;
  border-radius: 8px;
  background-color: var(--primary-color);
  color: white;
  text-decoration: none;
  text-align: center;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  transition: var(--transition);
}

.button-link:hover {
  background-color: #66b1ff;
}

.button-link.secondary {
  background: #f0f2f5;
  color: var(--text-color);
}

.button-link.secondary:hover {
  background: #e4e6eb;
}

.nav-buttons {
  display: flex;
  gap: 1rem;
  margin: 1.5rem 0;
}

.nav-buttons .button-link {
  flex: 1;
}

.results {
  margin-top: 2rem;
  padding: 1.5rem;
  background: var(--background-color);
  border-radius: 8px;
}

.result-content {
  padding: 0.8rem;
  margin: 0.5rem 0;
  background: white;
  border-radius: 8px;
  line-height: 1.6;
}

@media (max-width: 768px) {
  .container {
    padding: 1rem;
  }
  
  .card {
    padding: 1.5rem;
  }
  
  .button-group {
    flex-direction: column;
  }
  
  .button-link {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .input-grid {
    grid-template-columns: 1fr;
  }
  
  .card {
    padding: 1rem;
  }
}