* {
    box-sizing: border-box;
  }
  
  body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f3f6fb;
    color: #1f2937;
  }
  
  .container {
    min-height: 100vh;
    padding: 40px 16px;
  }
  
  .card {
    max-width: 860px;
    margin: 0 auto;
    background: #ffffff;
    border-radius: 16px;
    padding: 32px;
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.08);
  }
  
  h1 {
    margin-top: 0;
    margin-bottom: 8px;
  }
  
  .intro {
    margin-top: 0;
    margin-bottom: 24px;
    color: #6b7280;
  }
  
  .slot-card {
    background: #f9fafb;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 24px;
  }
  
  .slot-card h2 {
    margin-top: 0;
  }
  
  .row {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    padding: 10px 0;
    border-bottom: 1px solid #e5e7eb;
  }
  
  .row:last-child {
    border-bottom: none;
  }
  
  .row span {
    color: #6b7280;
  }
  
  .grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
  }
  
  .field {
    display: flex;
    flex-direction: column;
  }
  
  .field.full {
    grid-column: 1 / -1;
  }
  
  label {
    font-weight: 700;
    margin-bottom: 8px;
  }
  
  input,
  select {
    border: 1px solid #cbd5e1;
    border-radius: 10px;
    padding: 12px 14px;
    font-size: 16px;
    width: 100%;
  }
  
  input:focus,
  select:focus {
    outline: none;
    border-color: #2563eb;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
  }
  
  .checkbox {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    font-weight: 400;
  }
  
  .checkbox input {
    width: auto;
    margin-top: 4px;
  }
  
  button {
    margin-top: 24px;
    background: #2563eb;
    color: white;
    border: none;
    border-radius: 10px;
    padding: 14px 24px;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
  }
  
  button:hover {
    background: #1d4ed8;
  }
  
  button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
  }
  
  .message {
    padding: 14px 16px;
    border-radius: 10px;
    margin-bottom: 20px;
    font-weight: 700;
  }
  
  .message.success {
    background: #dcfce7;
    color: #166534;
    border: 1px solid #86efac;
  }
  
  .message.error {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fca5a5;
  }

  .back-button {
    display: inline-block;
    background: #2563eb;
    color: #fff;
    border-radius: 10px;
    padding: 14px 24px;
    font-size: 16px;
    font-weight: 700;
    text-decoration: none;
  }
  
  .back-button:hover {
    background: #1d4ed8;
  }
  
  .hidden {
    display: none;
  }
  
  @media (max-width: 700px) {
    .card {
      padding: 22px;
    }
  
    .grid {
      grid-template-columns: 1fr;
    }
  
    .row {
      flex-direction: column;
      align-items: flex-start;
    }
  }