.unit {
    margin-bottom: 20px;
    border: 1px solid #ddd;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    transition: box-shadow 0.3s;
    background: var(--unit-background);
    backdrop-filter: blur(10px);
}
.unit:hover {
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
}
.unit h2 {
    background-color: var(--unit-header-background);
    color: white;
    margin: 0;
    padding: 15px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1.3em;
    transition: background-color 0.3s;
    user-select: none;
}
.unit h2:hover {
    background-color: var(--unit-header-hover-background);
}
.category {
    margin: 10px 0;
}
.category h3 {
    background-color: var(--category-background);
    padding: 12px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid #ddd;
    font-size: 1.1em;
    transition: background-color 0.3s;
    user-select: none;
}
.category h3:hover {
    background-color: var(--category-hover-background);
}
.code-section {
    display: none;
    padding: 10px;
}
.fade-in {
    opacity: 0;
    animation: fadeIn 1s forwards;
}
.fade-out {
    opacity: 1;
    animation: fadeOut 1.5s forwards;
}
@keyframes fadeOut {
    to {
        opacity: 0;
    }
}
@keyframes fadeIn {
    to {
        opacity: 1;
    }
}
pre {
    background-color: #2d2d2d;
    color: #f8f8f2;
    padding: 15px;
    border-radius: 8px;
    overflow-x: auto;
    font-size: 0.9em;
}
.toggle-button, .file-toggle-button, .category-toggle-button {
    background: none;
    border: none;
    color: white;
    font-size: 1.2em;
    cursor: pointer;
}
.file-toggle-button, .category-toggle-button {
    color: var(--text-color);
}
.file-header {
    background-color: var(--file-header-background);
    padding: 12px;
    margin: 5px 0;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.3s, box-shadow 0.3s;
    user-select: none;
}
.file-header:hover {
    background-color: var(--file-header-hover-background);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}
.file-name {
    font-weight: bold;
    color: var(--file-name-color);
}
#loading {
    text-align: center;
    margin-bottom: 20px;
}
.progress-bar {
    width: 100%;
    background-color: #ddd;
    border-radius: 8px;
    overflow: hidden;
    height: 20px;
    margin-top: 10px;
}
.progress-bar-fill {
    height: 100%;
    width: 0;
    background-color: var(--progress-bar-fill);
    transition: width 0.3s;
}
.theme-selector {
    margin-top: 20px;
    text-align: center;
    user-select: none;
}
.theme-selector label {
    font-size: 1.1em;
    margin-right: 10px;
    user-select: none;
}
#themeSelect {
    padding: 8px;
    border-radius: 8px;
    border: 1px solid var(--select-border-color);
    background: var(--select-background);
    color: var(--text-color);
    font-size: 1em;
    transition: border-color 0.3s, box-shadow 0.3s;
    user-select: none;
}
#themeSelect:focus {
    outline: none;
    border-color: var(--select-focus-border-color);
    box-shadow: 0 0 8px rgba(0, 123, 255, 0.3);
}
.error-box {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
    padding: 10px;
    margin: 10px 0;
    border-radius: 5px;
}
.update-banner {
    padding: 10px;
    margin: 10px 0;
    border-radius: 5px;
    text-align: center;
}
.update-banner.up-to-date {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}
.update-banner.not-up-to-date {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}