:root {
    --bg: #f9f9fb;
    --card-bg: #fff;
    --text: #222;
    --primary: #6490ef; /* Softer blue */
    --primary-hover: #2e5bb5; /* Slightly darker for hover */
    --row-alt: #f1f5f9;
  }
  
  body.dark {
    --bg: #1e293b;
    --card-bg: #334155;
    --text: #f8fafc;
    --primary: #60a5fa; /* Softer blue for dark mode */
    --primary-hover: #3b82f6;
    --row-alt: #475569;
  }
  
  body {
    font-family: "Inter", sans-serif;
    margin: 0;
    padding: 20px;
    background: var(--bg);
    color: var(--text);
    transition: all 0.3s ease;
  }
  
  .container {
    max-width: 1000px;
    margin: auto;
  }
  
  h1 {
    text-align: center;
    margin-bottom: 20px;
  }
  
  .card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 14px;
    box-shadow: 0 6px 14px rgba(0,0,0,0.08);
    margin-bottom: 20px;
    border: 1px solid var(--primary);
  }
  
  .form-row {
    display: flex;
    gap: 20px;
    margin-top: 10px;
  }
  
  .form-group {
    flex: 1;
  }
  
  .form-section label {
    display: block;
    margin-top: 10px;
    font-weight: bold;
  }
  
  .form-section input {
    width: 100%;
    padding: 8px;
    margin-top: 5px;
    border: 1px solid #ccc;
    border-radius: 8px;
  }
  
  button {
    margin-top: 15px;
    padding: 10px 14px;
    background: var(--primary);
    color: #fff;
    font-weight: bold;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.3s;
  }
  
  button:hover {
    background: var(--primary-hover);
  }
  
  .comparison-table, #repaymentTable {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin-top: 15px;
    border-radius: 12px;
    overflow: hidden;
  }
  
  .comparison-table th, .comparison-table td,
  #repaymentTable th, #repaymentTable td {
    border: 1px solid #ccc;
    padding: 10px;
    text-align: center;
  }
  
  .comparison-table th, #repaymentTable th {
    background: var(--primary);
    color: #fff;
  }
  
  #repaymentTable tbody tr:nth-child(odd) {
    background: var(--row-alt);
  }
  
  .hidden {
    display: none;
  }
  
  .theme-btn {
    position: fixed;
    top: 15px;
    right: 20px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 50%;
    padding: 10px;
    font-size: 18px;
    cursor: pointer;
    transition: background 0.3s;
  }
  
  .theme-btn:hover {
    background: var(--primary-hover);
  }