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

/* Base styling */
body {
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.6;
    background-color: #f9f9f9;
    color: #333;
}

/* Layout */
header {
    background-image: url("./stars.jpg");
    background-size: cover;        /* Fill the header */
    background-position: center;   /* Center the image */
    background-repeat: no-repeat;

    color: #fff;
    padding: 3rem 0;

    /* Optional overlay for readability */
    position: relative;
}

.container {
    width: 85%;
    max-width: 1100px;
    margin: auto;
}

header h1 {
    color: #fff;
}

/* Navigation */
nav ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 1.2rem;
}

nav a {
    color: #fff;
    text-decoration: none;
    font-weight: bold;
}

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

/* Main content */
main {
    background: #fff;
    padding: 2rem;
    margin-top: 1.5rem;
    min-height: 60vh;
}

h1 {
    margin-bottom: 1rem;
    color: #003366;
}

h2 {
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
}

.research-item {
    margin-bottom: 1rem;
    padding: 1rem;
    border: 1px solid #ddd;
    border-radius: 6px;
    background: #fafafa;
}

.research-item summary {
    font-weight: bold;
    cursor: pointer;
    color: #003366;
    font-size: 1.05rem;
}

.research-item summary:hover {
    text-decoration: underline;
}

.research-item[open] {
    background: #ffffff;
}

/* Footer */
footer {
    margin-top: 2rem;
    padding: 1rem 0;
    text-align: center;
    font-size: 0.9rem;
    color: #666;
}