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

body {
    font-family: 'Inter', 'system-ui', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #f8f9fa; /* light gray */
    color: #212529; /* dark gray */
    line-height: 1.6;
    padding: 20px; /* optional, if container doesn't handle all spacing */
}

/* Container */
.container {
    max-width: 800px;
    margin: 40px auto; /* centers the container */
    padding: 30px;
    background-color: #ffffff; /* white */
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

/* Headings (h1 inside .container) */
.container h1 {
    text-align: center;
    color: #343a40;
    margin-bottom: 30px;
    font-size: 2rem; /* or appropriate size */
}

/* Input Fields */
#expense-description,
#expense-amount {
    display: block;
    width: 100%;
    padding: 12px 15px;
    margin-bottom: 15px;
    font-size: 1rem;
    border: 1px solid #ced4da;
    border-radius: 4px;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

#expense-description:focus,
#expense-amount:focus {
    border-color: #80bdff;
    outline: 0;
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

/* Button */
#add-expense {
    display: block;
    width: 100%;
    padding: 12px 20px;
    font-size: 1.05rem;
    font-weight: 500;
    color: #fff;
    background-color: #007bff; /* a modern blue */
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.15s ease-in-out;
    margin-bottom: 30px;
}

#add-expense:hover {
    background-color: #0056b3; /* darker blue */
}

/* Expense List */
#expense-list {
    list-style-type: none; /* already set in JS but good to have in CSS */
    padding: 0;
    margin-top: 20px; /* if not already spaced by button */
}

/* Expense List Items */
#expense-list li {
    background-color: #e9ecef; /* light gray, distinct from container */
    padding: 12px 15px;
    border: 1px solid #dee2e6;
    border-radius: 4px;
    margin-bottom: 8px;
    font-size: 0.95rem;
    color: #495057;
    display: flex; /* for potential future additions like delete buttons */
    justify-content: space-between;
    align-items: center;
}

/* Canvas */
#expense-chart {
    width: 100% !important; /* important might be needed to override default canvas sizing */
    max-height: 400px; /* or a suitable height */
    margin-top: 30px;
}