/* Modern Light Theme for LDR Voltage Divider Calculator */
:root {
  --primary-color: #4a6fa5;
  --accent-color: #ff6b6b;
  --text-color: #333333;
  --light-text: #666666;
  --background-color: #f9f9f9;
  --card-background: #ffffff;
  --border-color: #e0e0e0;
  --input-background: #ffffff;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  --transition: all 0.3s ease;
}

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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--background-color);
  padding: 2rem;
  max-width: 800px;
  margin: 0 auto;
}

h1 {
  color: var(--primary-color);
  text-align: center;
  margin-bottom: 1.5rem;
  font-weight: 600;
  font-size: 2.2rem;
}

p {
  margin-bottom: 1rem;
  color: var(--light-text);
}

form {
  background-color: var(--card-background);
  padding: 2rem;
  border-radius: 8px;
  box-shadow: var(--shadow);
  margin: 1.5rem 0;
}

label {
  display: flex;
  flex-direction: column;
  margin-bottom: 1rem;
  font-weight: 500;
  color: var(--primary-color);
}

input[type="text"] {
  padding: 0.8rem;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  margin-top: 0.4rem;
  font-size: 1rem;
  transition: var(--transition);
  background-color: var(--input-background);
}

input[type="text"]:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(74, 111, 165, 0.2);
}

input[type="submit"] {
  background-color: var(--primary-color);
  color: white;
  border: none;
  padding: 0.8rem 1.5rem;
  font-size: 1rem;
  border-radius: 4px;
  cursor: pointer;
  transition: var(--transition);
  display: block;
  margin: 1rem auto 0;
  font-weight: 500;
}

input[type="submit"]:hover {
  background-color: #3a5a8a;
  transform: translateY(-2px);
}

#results {
  background-color: var(--card-background);
  padding: 1.5rem;
  border-radius: 8px;
  box-shadow: var(--shadow);
  margin-bottom: 2rem;
  min-height: 50px;
}

#article {
  background-color: var(--card-background);
  padding: 2rem;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

#article hr {
  border: 0;
  height: 1px;
  background-color: var(--border-color);
  margin: 0.5rem 0 1.5rem;
}

#article p strong {
  color: var(--primary-color);
}

#article ul, #article ol {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

#article li {
  margin-bottom: 0.5rem;
}

/* Responsive adjustments */
@media (max-width: 600px) {
  body {
    padding: 1rem;
  }
  
  form, #results, #article {
    padding: 1.2rem;
  }
  
  h1 {
    font-size: 1.8rem;
  }
}