/* Color palette */
:root {
/*
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --accent-color: #e74c3c;
    --dark-color: #2c3e50;
    --light-color: #ecf0f1;
    --background-color: #f9f9f9;
*/
    --primary-color: #1e90ff;
    --secondary-color: #002366;
    --accent-color: #0e6160;
    --highlight-color: #fc3503;
    --dark-color: #2c3e50;
    --light-color: #ecf0f1;
    --background-color: #f9f9f9;
}

/* Base styles */
body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    background-color: var(--light-color);
}

header {
    text-align: center;
    margin-bottom: 40px;
    background-color: var(--dark-color);
    color: var(--light-color);
    padding: 20px;
    border-radius: 5px;
}

h1 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

h2 {
    color: var(--secondary-color);
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 10px;
}

h3 {
    color: var(--accent-color);
}

/* Navigation */
nav ul {
    list-style-type: none;
    padding: 0;
    margin-top: 20px;
}

nav ul li {
    display: inline;
    margin: 0 10px;
}

nav ul li a {
    color: var(--light-color);
    text-decoration: none;
    padding: 5px 10px;
    border-radius: 3px;
    transition: background-color 0.3s ease;
}

nav ul li a:hover {
    background-color: var(--primary-color);
}

#about > ul > li a.disabled {
    color: gray;
}

/* Layout */
main {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
}

.column {
    flex-basis: 100%;
    margin-bottom: 40px;
}

section {
    background-color: white;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
}

/* Info box */
.info-box {
    background-color: var(--background-color);
    border-left: 5px solid var(--highlight-color);
    padding: 15px;
    margin-top: 20px;
    border-radius: 5px;
}

/* Lists */
    li::marker {
      color: var(--secondary-color);
    }
    ul.mlist > li { list-style-type: "♢ "; }
    ul.nlist > li { list-style-type: "▸ "; }
    ul.xlist > li { list-style: none; }

/* Sidebar */
#sidebar ul {
    list-style-type: none;
    padding-left: 0;
}

#sidebar ul li {
    margin-bottom: 10px;
}

/* Footer */
footer {
    text-align: center;
    margin-top: 40px;
    padding: 20px;
    background-color: var(--dark-color);
    color: var(--light-color);
    border-radius: 5px;
}

/* Responsive design */
@media (min-width: 768px) {
    .column {
        flex-basis: 48%;
    }

    .column.left {
        flex-basis: 65%;
    }

    .column.right {
        flex-basis: 30%;
    }
}

/* Links */
a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--accent-color);
    text-decoration: underline;
}

a.disabled {
  color: var(--dark-color);
  pointer-events: none;  /* Prevent cursor interaction */
  opacity: 0.5;          /* Reduce opacity for faded look */
  text-decoration: none; /* Remove underline */
  cursor: default;      /* Set default cursor (optional) */
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 20px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 5px;
    text-decoration: none;
    transition: background-color 0.3s ease;
}

.btn:hover {
    background-color: var(--secondary-color);
    text-decoration: none;
}

/* Responsive typography */
@media (max-width: 768px) {
    body {
        font-size: 16px;
    }

    h1 {
        font-size: 24px;
    }

    h2 {
        font-size: 20px;
    }

    h3 {
        font-size: 18px;
    }

    nav ul li {
        display: block;
        margin: 10px 0;
    }
}