body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f5f5f5;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

h1 {
    color: #333;
    margin-bottom: 10px;
}

nav {
    background-color: #fff;
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

nav a {
    margin-right: 20px;
    text-decoration: none;
    color: #007bff;
    font-weight: 500;
}

nav a:hover {
    text-decoration: underline;
}

.dashboard, .transactions, .holdings {
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

table th {
    background-color: #f8f9fa;
    padding: 12px;
    text-align: left;
    font-weight: 600;
    border-bottom: 2px solid #dee2e6;
}

table td {
    padding: 12px;
    border-bottom: 1px solid #dee2e6;
}

table tr:hover {
    background-color: #f8f9fa;
}

.summary-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.card {
    background-color: #f8f9fa;
    padding: 20px;
    border-radius: 8px;
    text-align: center;
}

.card h3 {
    margin: 0 0 10px 0;
    font-size: 14px;
    color: #666;
    text-transform: uppercase;
}

.card .value {
    font-size: 24px;
    font-weight: bold;
    color: #333;
}

.positive {
    color: #28a745;
}

.negative {
    color: #dc3545;
}

button {
    background-color: #007bff;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
}

button:hover {
    background-color: #0056b3;
}

button.delete {
    background-color: #dc3545;
}

button.delete:hover {
    background-color: #c82333;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 8px;
    border: 1px solid #ced4da;
    border-radius: 4px;
    font-size: 14px;
}

.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
}

.modal-content {
    background-color: #fff;
    margin: 50px auto;
    padding: 20px;
    border-radius: 8px;
    max-width: 600px;
}

.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.close:hover {
    color: #000;
}