/* RESET + BASE */
  * {
    box-sizing: border-box;
  }
  body {
    margin: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f4f7fa;
    color: #333;
    transition: background 0.3s, color 0.3s;
    min-height: 100vh;
    display: flex;
  }
  body.dark {
    background: #121212;
    color: #eee;
  }

  /* SIDEBAR */
  .sidebar {
    width: 240px;
    background: #1abc9c;
    color: white;
    display: flex;
    flex-direction: column;
    padding: 1.5rem 1rem;
    gap: 1rem;
    height: 100vh;
    position: fixed;
    top: 0;
    left: 0;
    overflow-y: auto;
  }
  .sidebar h2 {
    margin: 0 0 1rem 0;
    font-weight: 900;
    font-size: 1.6rem;
    user-select: none;
  }
  .sidebar ul {
    list-style: none;
    padding: 0;
    margin: 0;
    flex-grow: 1;
  }
  .sidebar ul li {
    cursor: pointer;
    padding: 0.75rem 1rem;
    border-radius: 6px;
    margin-bottom: 0.25rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 600;
    user-select: none;
    transition: background 0.2s;
  }
  .sidebar ul li:hover,
  .sidebar ul li.active {
    background: rgba(0, 0, 0, 0.15);
  }
  .sidebar ul li i {
    min-width: 20px;
    text-align: center;
  }
  .sidebar .logout-btn {
    background: #e74c3c;
    padding: 0.75rem;
    border-radius: 6px;
    color: white;
    text-align: center;
    font-weight: 700;
    cursor: pointer;
    user-select: none;
    margin-top: auto;
  }
  .sidebar .logout-btn:hover {
    background: #c0392b;
  }

  /* MAIN CONTENT */
  .main {
    margin-left: 240px;
    padding: 1.5rem 2rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
  }
  header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
  }
  header h1 {
    margin: 0;
    font-weight: 900;
    font-size: 2rem;
  }
  header button {
    background: #1abc9c;
    border: none;
    color: white;
    padding: 0.7rem 1.2rem;
    font-weight: 700;
    border-radius: 6px;
    cursor: pointer;
    user-select: none;
    transition: background 0.3s;
  }
  header button:hover {
    background: #149174;
  }

  /* STATS CARDS */
  .stats {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
  }
  .card {
    background: white;
    border-radius: 10px;
    padding: 1.2rem 1.5rem;
    box-shadow: 0 4px 10px rgb(0 0 0 / 0.1);
    flex: 1 1 150px;
    user-select: none;
    color: #333;
  }
  body.dark .card {
    background: #222;
    color: #eee;
    box-shadow: 0 4px 10px rgb(255 255 255 / 0.1);
  }
  .card h3 {
    margin: 0 0 0.5rem 0;
    font-weight: 700;
    font-size: 1.1rem;
  }
  .card p {
    margin: 0;
    font-weight: 900;
    font-size: 1.6rem;
  }

  /* CHART CONTAINER */
  #financeChart {
    max-width: 600px;
    margin: 0 auto 2rem auto;
  }

  /* RECORDS TABLE */
  #recordsSection {
    flex-grow: 1;
  }
  #recordsSection h2 {
    font-weight: 800;
    margin-bottom: 0.7rem;
  }
  #searchInput {
    width: 100%;
    padding: 0.6rem 1rem;
    margin-bottom: 0.8rem;
    border-radius: 6px;
    border: 1px solid #ccc;
    font-size: 1rem;
  }
  body.dark #searchInput {
    background: #333;
    border-color: #555;
    color: #eee;
  }
  table {
    width: 100%;
    border-collapse: collapse;
    font-size: 1rem;
  }
  thead tr {
    background: #1abc9c;
    color: white;
    user-select: none;
  }
  body.dark thead tr {
    background: #149174;
  }
  th, td {
    padding: 0.7rem 1rem;
    border-bottom: 1px solid #ddd;
    text-align: left;
  }
  body.dark th, body.dark td {
    border-color: #444;
  }
  tbody tr:hover {
    background: #e7f9f8;
  }
  body.dark tbody tr:hover {
    background: #264d4c;
  }
  button.delete-btn {
    background: transparent;
    border: none;
    color: #e74c3c;
    cursor: pointer;
    font-weight: 700;
  }

  /* MODALS */
  .modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0,0,0,0.5);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 10000;
  }
  .modal.active {
    display: flex;
  }
  .modal-content {
    background: white;
    padding: 1.5rem 2rem;
    border-radius: 10px;
    width: 90%;
    max-width: 400px;
    box-shadow: 0 4px 15px rgb(0 0 0 / 0.2);
    position: relative;
  }
  body.dark .modal-content {
    background: #222;
    color: #eee;
  }
  .close-btn {
    position: absolute;
    top: 12px;
    right: 18px;
    cursor: pointer;
    font-size: 1.5rem;
    color: #888;
    user-select: none;
  }
  .close-btn:hover {
    color: #333;
  }
  body.dark .close-btn:hover {
    color: #ccc;
  }
  input[type="text"],
  input[type="email"],
  input[type="password"],
  input[type="number"],
  input[type="date"],
  select {
    width: 100%;
    padding: 0.7rem 1rem;
    margin: 0.6rem 0 1rem 0;
    font-size: 1rem;
    border-radius: 6px;
    border: 1px solid #ccc;
    transition: border-color 0.3s;
  }
  body.dark input, body.dark select {
    background: #333;
    border-color: #555;
    color: #eee;
  }
  input:focus, select:focus {
    outline: none;
    border-color: #1abc9c;
  }
  button {
    background: #1abc9c;
    border: none;
    color: white;
    padding: 0.8rem 1.3rem;
    font-weight: 700;
    border-radius: 6px;
    cursor: pointer;
    user-select: none;
    transition: background 0.3s;
  }
  button:hover {
    background: #149174;
  }
  button[disabled] {
    background: #ccc;
    cursor: not-allowed;
  }

  /* AUTH MODAL SPECIAL */
  #authModal .modal-content {
    max-width: 350px;
  }
  #authModal .toggle-link {
    color: #1abc9c;
    cursor: pointer;
    text-decoration: none;
    font-weight: 700;
  }
  #authModal .toggle-link:hover {
    text-decoration: underline;
  }

  /* Responsive */
  @media (max-width: 768px) {
    body {
      flex-direction: column;
    }
    .sidebar {
      width: 100%;
      height: auto;
      position: relative;
      flex-direction: row;
      overflow-x: auto;
      padding: 0.5rem 1rem;
      gap: 0.5rem;
      user-select: none;
    }
    .sidebar h2 {
      flex-shrink: 0;
      font-size: 1.3rem;
    }
    .sidebar ul {
      display: flex;
      gap: 0.5rem;
      flex-wrap: nowrap;
      overflow-x: auto;
      padding: 0;
      margin: 0;
      flex-grow: 1;
    }
    .sidebar ul li {
      flex-shrink: 0;
      margin-bottom: 0;
      padding: 0.5rem 0.8rem;
      border-radius: 4px;
    }
    .main {
      margin-left: 0;
      padding: 1rem;
    }
  }