body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  padding: 0;
  background: #f5f5f5;
  color: #333;
}
.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 20px;
}
header {
  background: #4CAF50;
  color: white;
  padding: 20px;
  border-radius: 8px;
  margin-bottom: 20px;
}
.balance-box {
  background: white;
  padding: 10px;
  border-radius: 5px;
  color: #333;
}
.add-transaction, .transactions {
  background: white;
  padding: 20px;
  border-radius: 8px;
  margin-bottom: 20px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}
/* Charts */
.analytics {
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.chart-container {
  flex: 1;
  min-width: 300px;
  background: white;
  padding: 1rem;
  border-radius: 8px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

canvas {
  width: 100% !important;
  height: 300px !important;
}
table {
  width: 100%;
  border-collapse: collapse;
}
th, td {
  padding: 12px;
  text-align: left;
  border-bottom: 1px solid #ddd;
}
button {
  background: #4CAF50;
  color: white;
  border: none;
  padding: 10px 15px;
  border-radius: 5px;
  cursor: pointer;
}
button:hover {
  background: #45a049;
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    height: auto;
    display: flex;
    justify-content: center;
    align-items: center;
}

.auth-container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

.auth-box {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.auth-box h2 {
    margin-bottom: 20px;
    color: #333;
}

.auth-box input {
    width: 100%;
    padding: 12px;
    margin: 10px 0;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
}

.auth-box button {
    width: 100%;
    padding: 12px;
    margin: 15px 0;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.3s;
}

.auth-box button:hover {
    background: #5a6fd1;
}

.auth-switch {
    color: #666;
    margin-top: 15px;
}

.auth-switch span {
    color: #667eea;
    cursor: pointer;
    font-weight: 600;
}

.auth-switch span:hover {
    text-decoration: underline;
}