/* Modern Light Theme for Compound Interest Calculator */

/* Base styles and resets */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #f9fafb;
  padding: 20px;
  max-width: 1200px;
  margin: 0 auto;
}

/* Container */
.container {
  background-color: #ffffff;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  padding: 32px;
  margin-bottom: 40px;
}

.row {
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* Headings */
#main-heading {
  color: #1a56db;
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 1rem;
  font-weight: 600;
}

/* Form styling */
.form-group {
  margin-bottom: 24px;
  width: 100%;
}

label {
  display: block;
  margin-bottom: 8px;
  font-size: 1.1rem;
  color: #4b5563;
  font-weight: 500;
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  font-size: 1rem;
  border: 2px solid #e5e7eb;
  border-radius: 8px;
  background-color: #f9fafb;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-control:focus {
  border-color: #3b82f6;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25);
  outline: none;
}

.form-control::placeholder {
  color: #9ca3af;
}

/* Button styling */
.btn {
  display: inline-block;
  font-weight: 500;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  border: none;
  padding: 12px 24px;
  font-size: 1rem;
  border-radius: 8px;
  transition: all 0.2s ease;
}

.btn-danger {
  background-color: #2563eb;
  color: white;
}

.btn-danger:hover {
  background-color: #1d4ed8;
  transform: translateY(-1px);
}

.btn-danger:active {
  transform: translateY(1px);
}

/* Clear button styling */
#clear {
  background-color: #f3f4f6;
  color: #4b5563;
  margin-left: 12px;
}

#clear:hover {
  background-color: #e5e7eb;
}

/* Button container */
.calc {
  display: inline-block;
  margin-right: 10px;
}

/* Result section */
#append {
  margin-top: 24px;
  padding: 20px;
  background-color: #f0f9ff;
  border-radius: 8px;
  border-left: 4px solid #3b82f6;
}

/* Article section */
#article {
  background-color: #ffffff;
  padding: 32px;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  margin-bottom: 40px;
}

#article p {
  margin-bottom: 16px;
  color: #4b5563;
  font-size: 1.05rem;
}

#article strong {
  color: #1e40af;
}

#article ol {
  margin-left: 24px;
  margin-bottom: 16px;
}

#article li {
  margin-bottom: 8px;
}

blockquote {
  background-color: #f3f4f6;
  border-left: 4px solid #3b82f6;
  padding: 16px;
  margin: 20px 0;
  border-radius: 0 8px 8px 0;
}

blockquote p {
  margin-bottom: 0 !important;
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .container, #article {
    padding: 20px;
  }
  
  #main-heading {
    font-size: 2rem;
  }
  
  .btn {
    padding: 12px 16px;
    width: 100%;
    margin-bottom: 12px;
  }
  
  .calc {
    display: block;
    width: 100%;
    margin-right: 0;
  }
  
  #clear {
    margin-left: 0;
  }
}

/* For the calculator form column */
.col-xs-6.col-md-offset-3 {
  width: 100%;
  max-width: 600px;
}