@font-face {
    font-family: 'LinBiolinum';
    src: url('LinBiolinum_R.otf') format('opentype');
    font-weight: normal;
    font-style: normal;
}

@font-face {
    font-family: 'LinBiolinum';
    src: url('LinBiolinum_RB.otf') format('opentype');
    font-weight: bold;
    font-style: normal;
}

@font-face {
    font-family: 'LinBiolinum';
    src: url('LinBiolinum_RI.otf') format('opentype');
    font-weight: normal;
    font-style: italic;
}

body {
    font-family: 'LinBiolinum', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 1.4rem;
    line-height: 1.6;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background-color: #121212;
    color: #e0e0e0;
}
h1, h2, h3, .zone-name {
    color: #bb9b62;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}
h1 {
    text-align: center;
    margin-bottom: 30px;
    font-size: 2.2rem;
    text-shadow: 0 0 10px rgba(187, 155, 98, 0.4);
}
.description {
    text-align: center;
    font-style: italic;
    margin-bottom: 30px;
    color: #a0a0a0;
}
/* Link styles */
a {
    color: #d4af7a;
    text-decoration: none;
    transition: color 0.2s ease;
}
a:hover {
    color: #e6c998;
    text-decoration: underline;
}
a:visited {
    color: #9d7e52;
}
a:active {
    color: #f0d6a7;
}
.chapter {
    margin-bottom: 30px;
    background-color: #1e1e1e;
    border-radius: 5px;
    padding: 15px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.5);
    border: 1px solid #333;
}
.chapter-header {
    display: flex;
    align-items: center;
    cursor: pointer;
    user-select: none;
    padding: 5px;
    border-radius: 3px;
    transition: background-color 0.2s;
    list-style: none;
}
.chapter-header h2 {
    margin: 0;
    flex-grow: 1;
    font-size: 1.4rem;
}
.chapter-content {
    display: block;
    padding-top: 15px;
    border-top: 1px solid #333;
    margin-top: 10px;
}
details[open] .collapse-icon:after {
    content: "";
    display: inline-block;
    width: 0;
    height: 0;
    border-left: 7px solid transparent;
    border-right: 7px solid transparent;
    border-top: 10px solid #bb9b62;
}
details:not([open]) .collapse-icon:after {
    content: "";
    display: inline-block;
    width: 0;
    height: 0;
    border-top: 7px solid transparent;
    border-bottom: 7px solid transparent;
    border-left: 10px solid #bb9b62;
}
.collapse-icon {
    display: inline-block;
    width: 18px;
    text-align: center;
    margin-right: 10px;
}
.zone {
    margin-bottom: 20px;
    padding: 12px;
    border-left: 3px solid #bb9b62;
    background-color: #262626;
    border-radius: 3px;
}
.zone:last-child {
    margin-bottom: 0;
}
.zone-header {
    display: flex;
    align-items: center;
}
.zone-name {
    margin: 0;
    flex-grow: 1;
    font-size: 1.2rem;
    cursor: pointer;
}
.zone-description p:last-child {
    margin-bottom: 0;
}
input[type="checkbox"]:checked ~ .zone-description {
    opacity: 0.7;
}
input[type="checkbox"]:checked + .zone-name {
    color: #8a8a8a;
    text-decoration: line-through;
}
.zone input[type="checkbox"]:checked ~ * {
    opacity: 0.7;
}
.zone.completed {
    opacity: 0.7;
    background-color: #2a2a2a;
    border-left-color: #5a5a5a;
}
input[type="checkbox"] {
    transform: scale(1.3);
    margin-right: 10px;
    accent-color: #bb9b62;
    cursor: pointer;
}
details > summary {
    list-style: none;
}
details > summary::-webkit-details-marker {
    display: none;
}

/* Mobile responsiveness */
@media (max-width: 600px) {
    body {
        padding: 12px;
    }
    h1 {
        font-size: 1.8rem;
    }
    .chapter-header h2 {
        font-size: 1.2rem;
    }
    .zone-name {
        font-size: 1.1rem;
    }
}