/* Modern Light Theme for Multiplication Table Generator */

:root {
  --primary-color: #3498db;
  --primary-dark: #2980b9;
  --text-color: #333;
  --light-bg: #f8f9fa;
  --border-color: #e0e0e0;
  --success-color: #2ecc71;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --container-width: 90%;
  --max-width: 1200px;
  --border-radius: 8px;
  --font-main: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

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

body {
  font-family: var(--font-main);
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--light-bg);
  padding: 20px;
  max-width: var(--max-width);
  margin: 0 auto;
}

h1 {
  color: var(--primary-dark);
  text-align: center;
  margin: 1.5rem 0;
  font-size: 2.2rem;
  font-weight: 600;
}

h3 {
  color: var(--primary-dark);
  margin: 1.2rem 0 0.8rem;
  font-weight: 500;
}

input {
  padding: 12px 16px;
  margin: 8px;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: 16px;
  transition: all 0.3s ease;
  outline: none;
  width: calc(50% - 16px);
  max-width: 200px;
}

input:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

button {
  background-color: var(--primary-color);
  color: white;
  border: none;
  padding: 12px 24px;
  cursor: pointer;
  border-radius: var(--border-radius);
  font-size: 16px;
  font-weight: 500;
  transition: background-color 0.3s ease;
  margin: 8px;
}

button:hover {
  background-color: var(--primary-dark);
}

#adddiv {
  margin-top: 24px;
  overflow-x: auto;
  background-color: white;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
}

table {
  border-collapse: collapse;
  width: 100%;
  margin: 16px 0;
  font-size: 15px;
}

th, td {
  border: 1px solid var(--border-color);
  padding: 10px;
  text-align: center;
  transition: background-color 0.2s ease;
}

th {
  background-color: var(--primary-color);
  color: white;
  font-weight: 500;
}

tr:nth-child(even) {
  background-color: #f2f2f2;
}

tr:hover {
  background-color: rgba(52, 152, 219, 0.1);
}

td:first-child {
  background-color: var(--primary-color);
  color: white;
  font-weight: 500;
}

#article {
  margin-top: 32px;
  background-color: white;
  padding: 24px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
}

hr {
  border: 0;
  height: 1px;
  background-color: var(--border-color);
  margin: 16px 0;
}

p {
  margin-bottom: 16px;
  line-height: 1.7;
}

strong {
  color: var(--primary-dark);
  font-weight: 600;
}

pre {
  background-color: var(--light-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 16px;
  overflow-x: auto;
  margin: 16px 0;
  font-family: 'Courier New', Courier, monospace;
}

code {
  font-family: 'Courier New', Courier, monospace;
}

/* Responsive adjustments */
@media (max-width: 768px) {
  h1 {
    font-size: 1.8rem;
  }
  
  input {
    width: 100%;
    max-width: none;
    margin: 8px 0;
  }
  
  button {
    width: 100%;
    margin: 16px 0;
  }
  
  #article {
    padding: 16px;
  }
}