style.css

/* Root Variables for Theme */
:root {
  --primary-color: #3498db;
  --secondary-color: #2ecc71;
  --background-color: #f4f4f8;
  --card-background: #ffffff;
  --text-primary: #2c3e50;
  --text-secondary: #7f8c8d;
  --border-color: #e0e4e8;
  --accent-color: #e74c3c;
}

/* Global Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Arial', sans-serif;
  background: linear-gradient(135deg, #f6f8f9 0%, #e5ebee 100%);
  color: var(--text-primary);
  line-height: 1.6;
  padding: 20px;
}

h1, h2 {
  text-align: center;
  margin-bottom: 20px;
  color: var(--primary-color);
}

.dashboard {
  max-width: 1200px;
  margin: 0 auto;
  background-color: var(--background-color);
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

/* Financial Summary Cards */
.financial-summary {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 30px;
}

.summary-card {
  flex: 1;
  background-color: var(--card-background);
  padding: 15px 20px;
  border-radius: 8px;
  text-align: center;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

.summary-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.2);
}

.summary-card h3 {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 10px;
  text-transform: uppercase;
}

.summary-card p {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--primary-color);
}

/* Add Transaction Form */
.add-form {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 30px;
  background-color: var(--card-background);
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

.add-form input, 
.add-form select {
  flex: 1;
  padding: 12px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background: white;
  font-size: 1rem;
}

.add-form button {
  padding: 12px 20px;
  border: none;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.3s ease;
}

.add-form button:hover {
  background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

/* Tables Styling */
.transactions-table, .customer-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 30px;
  background: white;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.transactions-table th, .customer-table th {
  background-color: var(--primary-color);
  color: white;
  text-align: left;
  padding: 12px;
  font-size: 0.9rem;
  text-transform: uppercase;
}

.transactions-table td, .customer-table td {
  padding: 12px;
  font-size: 0.9rem;
  color: var(--text-primary);
  background-color: var(--background-color);
}

.transactions-table tr:nth-child(even) td, .customer-table tr:nth-child(even) td {
  background-color: #f0f0f0;
}

.transactions-table tr:hover, .customer-table tr:hover {
  background-color: var(--accent-color);
  color: white;
  transition: all 0.3s ease;
}

/* Customer Selector */
.customer-selector {
  margin-bottom: 20px;
  text-align: center;
}

.customer-selector select {
  padding: 10px;
  font-size: 1rem;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background: white;
  width: 250px;
}

/* Responsive Design */
@media screen and (max-width: 768px) {
  .financial-summary {
      flex-direction: column;
  }

  .summary-card {
      width: 100%;
      margin-bottom: 10px;
  }

  .add-form {
      flex-direction: column;
  }

  .add-form input, 
  .add-form select, 
  .add-form button {
      width: 100%;
  }

  .transactions-table, .customer-table {
      display: block;
      overflow-x: auto;
  }

  .transactions-table th, .transactions-table td,
  .customer-table th, .customer-table td {
      font-size: 0.8rem;
  }
}