:root {
   --color-primary-light: #2e8b57;
   --color-secondary-light: #a8d5ba;
   --color-white: #fff;
   --color-text-dark: #2d3436;
   --color-heading-dark: #1a202c;
   --color-text-secondary: #2d3748;
   --color-income: #059669;
   --color-expense: #dc2626;
   --color-background-light: #f6f8fb;
   --color-border-light: #e2e8f0;
   --color-focus-border: #667eea;
   --color-text-gray: #718096;
   --color-button-gradient-start: #2e8b57;
   --color-button-gradient-end: #3cb371;
   --color-scroll-thumb: #cbd5e0;
   --color-scroll-thumb-hover: #a0aec0;
   --color-delete-button-hover: #fee2e2;
}

* {
   margin: 0;
   padding: 0;
   box-sizing: border-box;
   font-family: 'Poppins', sans-serif;
}

body {
   width: 100%;
   min-height: 100vh;
   display: flex;
   justify-content: center;
   align-items: center;
   background: linear-gradient(135deg, var(--color-primary-light), var(--color-secondary-light));
   padding: 20px;
   color: var(--color-text-dark);
}

.container {
   width: 100%;
   max-width: 1200px;
   background-color: var(--color-white);
   padding: 2rem;
   border-radius: 24px;
   box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
}

.container h1 {
   text-align: center;
   color: var(--color-heading-dark);
   margin-bottom: 35px;
   font-size: 2.2rem;
   font-weight: 600;
   letter-spacing: -0.5px;
}

.container h2 {
   color: var(--color-text-secondary);
   margin-bottom: 1rem;
   font-size: 1.25rem;
   font-weight: 500;
}

.balance-container {
   text-align: center;
   margin-bottom: 35px;
   padding: 24px;
   background: linear-gradient(135deg, var(--color-secondary-light), #6b8e23);
   border-radius: 1rem;
   box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.balance-container h1 {
   font-size: 3rem;
   margin: 15px 0;
}

.balance-container .summary {
   display: grid;
   grid-template-columns: 1fr 1fr;
   gap: 24px;
   margin-top: 24px;
}

.summary__child {
   background-color: var(--color-white);
   padding: 24px;
   border-radius: 1rem;
   box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
   transition: transform 0.2s ease;
}

.summary__child {
   transform: translateY(-2px);
}

.summary__child h3 {
   color: var(--color-income);
   font-size: 1.1rem;
   font-weight: 500;
}

.summary__child:nth-child(2) h3 {
   color: var(--color-expense);
}

.summary__child p {
   color: var(--color-income);
   font-size: 1.75rem;
   font-weight: 600;
   margin-top: 8px;
}

.summary__child:nth-child(2) p {
   color: var(--color-expense);
}

.container .main-content {
   display: grid;
   grid-template-columns: 1fr 1fr;
   gap: 24px;
}

.main-content .transaction-container {
   height: 100%;
   display: flex;
   flex-direction: column;
}

.transaction-container #transaction-list {
   list-style: none;
   max-height: 500px;
   overflow-y: auto;
   padding-right: 8px;
   flex-grow: 1;
}

.transaction-container #transaction-list::-webkit-scrollbar {
   width: 8px;
}

.transaction-container #transaction-list::-webkit-scrollbar-track {
   background-color: #f1f1f1;
   border-radius: 4px;
}

.transaction-container #transaction-list::-webkit-scrollbar-thumb {
   background-color: var(--color-scroll-thumb);
   border-radius: 4px;
}

.transaction-container #transaction-list::-webkit-scrollbar-thumb:hover {
   background-color: var(--color-scroll-thumb-hover);
}

.transaction {
   display: flex;
   justify-content: space-between;
   align-items: center;
   padding: 1rem 1.2rem;
   margin-bottom: 12px;
   border-radius: 12px;
   background-color: var(--color-white);
   box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
   transition: all 0.2s ease;
   border-right: 5px solid;
   animation: slideIn 0.3s ease;
}

@keyframes slideIn {
   from {
      opacity: 0;
      transform: translateX(-20px);
   }

   to {
      opacity: 1;
      transform: translateX(0px);
   }
}

.transaction:hover {
   transform: translateX(4px);
   box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.transaction.income {
   border-right-color: var(--color-income);
}

.transaction.expense {
   border-right-color: var(--color-expense);
}

.transaction .delete-btn {
   background: none;
   border: none;
   color: var(--color-expense);
   cursor: pointer;
   font-size: 1.4rem;
   opacity: 0;
   transition: all 0.2s ease;
   padding: 4px 8px;
   border-radius: 4px;
   margin-left: 12px;
}

.transaction:hover .delete-btn {
   opacity: 1;
}

.transaction .delete-btn:hover {
   background-color: var(--color-delete-button-hover);
   transform: scale(1.1);
}

.form-container {
   background: linear-gradient(135deg, var(--color-background-light), #f1f4f8);
   padding: 24px;
   border-radius: 16px;
   box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
   height: 100%;
   display: flex;
   flex-direction: column;
}

.form-container form {
   height: 100%;
   display: flex;
   flex-direction: column;
}

.form-group {
   margin-bottom: 20px;
}

.form-group label {
   display: block;
   margin-bottom: 8px;
   color: #4a5568;
   font-weight: 500;
}

.form-group input {
   width: 100%;
   padding: 12px 16px;
   border: 2px solid var(--color-border-light);
   border-radius: 8px;
   font-size: 1rem;
   transition: all 0.2s ease;
   background-color: var(--color-white);
}

.form-group input:hover {
   border-color: #cbd5e0;
}

.form-group input:focus {
   outline: none;
   border-color: var(--color-focus-border);
   box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

small {
   color: var(--color-text-gray);
   font-size: 0.875rem;
   margin-top: 4px;
   display: block;
}

button[type="submit"] {
   width: 100%;
   padding: 14px;
   background: linear-gradient(135deg, var(--color-button-gradient-start) 0%, var(--color-button-gradient-end) 100%);
   color: var(--color-white);
   border: none;
   border-radius: 8px;
   cursor: pointer;
   font-size: 1rem;
   font-weight: 500;
   transition: all 0.2s ease;
   box-shadow: 0 4px 12px rgba(102, 126, 234, 0.2);
   margin-top: auto;
}

button[type="submit"]:hover {
   transform: translateY(-2px);
   box-shadow: 0 6px 16px rgba(102, 126, 234, 0.3);
}

button[type="submit"]:active {
   transform: translateY(0);
}

/* responsiveness */

@media (max-width: 900px) {
   .main-content {
      grid-template-columns: 1fr !important;
   }

   #transaction-list {
      max-height: 300px;
   }

   .container {
      width: 95%;
      max-height: 90vh;
      overflow-y: auto;
      padding: 1rem;
   }
}

@media (max-width: 480px) {
   .container {
      padding: 24px;
   }

   .summary {
      grid-template-columns: 1fr !important;
      gap: 16px;
   }

   .balance-container h1 {
      font-size: 2.5rem;
   }

   .income p,
   .expenses p {
      font-size: 1.5rem;
   }

   .transaction {
      padding: 14px 16px;
   }

   h1 {
      font-size: 1.8rem;
   }
}