:root {
    --dilemma-light-gray: #f0f0f0;
    --cooperate-color: #ddffdd;
    --defect-color: #ffdddd;
}

body {
    background-color: white;
    padding: 20px;
}

/* HEADER */

header {
    text-align: center;
}

/* NAV */

nav {
    text-align: center;
}

nav ul {
    margin: 0;
    padding: 0;
}

nav ul > li {
    display: inline-block;
    margin: 0 5px 0 5px
}

/* FOOTER */

footer {
    text-align: center;
}


/* TABLES */

/* Common table rules */

table {
    border-collapse: collapse;
    border: 1px solid black;
    margin-top: 20px;
    text-align: left;
}

th, td {
    border: 1px solid black;
    padding: 10px;
}

thead th {
    background-color: var(--dilemma-light-gray);
    font-weight: bold;
}

tbody {
    background-color: white;
}

/* Special table rules */

.right {
    text-align: right;
}

.left {
    text-align: left;
}

.cell-cooperate {
    background-color: var(--cooperate-color);
}

.cell-defect {
    background-color: var(--defect-color);
}

/* FORMS */

form {
    max-width: 400px;
    margin: 20px 0;
    padding: 20px;
    width: auto;
    border: 1px solid black;
}

form div {
    margin-bottom: 20px;
}

form label {
    display: block;
    margin-bottom: 5px;
}

form input[type="text"],
form input[type="password"] {
    width: 100%; /* Full width inside the form */
    padding: 5px;
    box-sizing: border-box; /* Ensures padding and border don't overflow container size */
}