.day-calculator {
    max-width: 800px;
    margin: 0 auto;
    padding: 25px;
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 3px 15px rgba(0,0,0,0.1);
    font-family: 'Segoe UI', Roboto, sans-serif;
  }
  
  .calculator-header {
    text-align: center;
    margin-bottom: 25px;
  }
  
  .calculator-header h1,
  .calculator-header h2 {
    color: #2c3e50;
    margin-bottom: 10px;
  }
  
  .subtitle {
    color: #7f8c8d;
    font-size: 1.1em;
  }
  
  .trust-badges {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 15px;
    flex-wrap: wrap;
  }
  
  .trust-badges span {
    background: #f1f8fe;
    padding: 5px 10px;
    border-radius: 20px;
    font-size: 0.9em;
    color: #3498db;
  }
  
  .calculator-tool {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 20px;
  }
  
  .input-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 20px;
  }
  
  .date-input {
    grid-column: span 2;
  }
  
  .date-input input {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
  }
  
  .operation-select {
    display: flex;
    gap: 10px;
    grid-column: span 2;
  }
  
  .operation-select button {
    flex: 1;
    padding: 12px;
    border: none;
    border-radius: 5px;
    background: #e0e0e0;
    cursor: pointer;
    font-weight: 600;
  }
  
  .operation-select button.active {
    background: #3498db;
    color: white;
  }
  
  .options-section {
    grid-column: span 2;
    display: flex;
    flex-direction: column;
    gap: 10px;
  }
  
  .option-checkbox {
    display: flex;
    align-items: center;
    gap: 8px;
  }
  
  .result-section {
    margin-top: 20px;
  }
  
  .result-card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
  }
  
  .result-date {
    font-size: 2em;
    font-weight: bold;
    color: #2c3e50;
    margin-bottom: 5px;
  }
  
  .result-details {
    color: #7f8c8d;
  }
  
  .timeline-visual {
    margin-top: 25px;
  }
  
  .timeline-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #f1f8fe;
    padding: 15px;
    border-radius: 8px;
    position: relative;
  }
  
  .timeline-bar::after {
    content: "";
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 80%;
    height: 2px;
    background: #3498db;
    z-index: 1;
  }
  
  .timeline-start, .timeline-end {
    background: white;
    padding: 10px 15px;
    border-radius: 5px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    z-index: 2;
    text-align: center;
  }
  
  .timeline-arrow {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    font-size: 1.5em;
    color: #3498db;
    z-index: 3;
    background: white;
    padding: 0 10px;
  }
  
  .calendar-miniview {
    margin: 30px 0;
  }
  
  .mini-calendar {
    background: white;
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  .action-buttons {
    display: flex;
    gap: 10px;
    margin: 20px 0;
  }
  
  .action-buttons button {
    flex: 1;
    padding: 12px;
    border: none;
    border-radius: 5px;
    background: #3498db;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
  }
  
  .usecases-section {
    margin: 40px 0;
  }
  
  .usecase-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-top: 15px;
  }
  
  .usecase-card {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 8px;
  }
  
  .faq-section {
    margin-top: 40px;
  }
  
  @media (max-width: 768px) {
    .input-section {
      grid-template-columns: 1fr;
    }
    
    .usecase-cards {
      grid-template-columns: 1fr;
    }
    
    .action-buttons {
      flex-direction: column;
    }
  }