:root {
    --primary-color: #3498db;
    --bg-color: #f8f9fa;
    --text-color: #333;
    --hover-color: #e9ecef;
    --primary-color-rgb: 0, 123, 255;
    --primary-color-dark: #007bff;
}

body,
html {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol';
    margin: 0;
    padding: 0;
    height: 100%;
    background-color: var(--bg-color);
    color: var(--text-color);
}

#main {
    display: flex;
    height: 100%;
}

#sidetree {
    width: 275px;
    height: 100%;
    overflow-y: auto;
    background-color: white;
    box-shadow: 2px 0 5px rgba(0, 0, 0, 0.1);
    padding: 15px;
    box-sizing: border-box;
    transition: transform 0.3s ease-in-out;
}

#content {
    flex-grow: 1;
    padding: 10px;
    box-sizing: border-box;
}

.treeheader {
    font-size: 1.1em;
    margin-bottom: 15px;
    color: var(--primary-color);
}

#sidetreecontrol {
    margin-bottom: -5px;
}

#sidetreecontrol a {
    color: var(--text-color);
    text-decoration: none;
    margin-right: 10px;
    font-size: 0.8em;
    display: inline-flex;
    align-items: center;
    padding: 5px;
    border-radius: 4px;
    transition: background-color 0.2s;
}

#sidetreecontrol a:hover {
    background-color: var(--hover-color);
    text-decoration: none;
}

#sidetreecontrol a i {
    margin-right: 5px;
    font-size: 0.8em;
    color: var(--text-color);
    opacity: 0.8;
}

ul,
li {
    list-style-type: none;
}

#jTree {
    list-style-type: none;
    padding-left: 0;
}

#jTree ul {
    padding-left: 20px;
    display: none;
}

#jTree ul.open {
    display: block;
}

#jTree li {
    padding: 5px 0;
}

.t {
    display: flex;
    align-items: center;
}

.t>i {
    margin-right: 5px;
    color: var(--primary-color);
}

.t>a,
.t>span {
    cursor: pointer;
    padding: 5px;
    border-radius: 4px;
    transition: background-color 0.2s;
}

.t>a:hover,
.t>span:hover {
    background-color: var(--hover-color);
}

.t>span {
    user-select: none;
}

.t>span::before {
    font-family: "Font Awesome 6 Free";
    content: '\f0da';
    display: inline-block;
    margin-right: 6px;
    transition: transform 0.3s;
    font-weight: 900;
    color: var(--primary-color);
}

.t>span.open::before {
    transform: rotate(90deg);
}

#jTree .t::before {
    font-family: 'Font Awesome 6 Free';
    margin-right: 5px;
    color: var(--primary-color);
}

#jTree .t.d::before {
    content: '\f07b';
}

#jTree .t.f::before {
    content: '\f15b';
}

#jTree .t.f a{
    font-size: 0.9em;
}

#main-frame {
    width: 100%;
    height: 100%;
    border: none;
}

#jTree li a {
    color: inherit;
    text-decoration: none;
    cursor: pointer;
}

#jTree li a:hover {
    background-color: var(--hover-color);
}

#home {
    font-size: 1.0em; 
    text-decoration: none;
    color: var(--primary-color);
}

#menu-toggle {
    display: none;
    position: fixed;
    top: 10px;
    left: 10px;
    z-index: 1000;
    background-color: #f8f9fa;
    border: 1px solid #e9ecef;
    border-radius: 5px;
    padding: 10px;
    cursor: pointer;
}

#search-button {
    flex: 0 0 auto;
    background-color: #f0f0f0;
    border: 1px solid #ccc;
    border-left: none;
    border-radius: 0 4px 4px 0;
    padding: 5px 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 40px;
}

#search-button:hover {
    background-color: #e0e0e0;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

#search-button i.fa-spinner {
    animation: spin 2s linear infinite;
}

#search-button:disabled {
    opacity: 0.9;
    cursor: not-allowed;
    background-color: #eee;
    color: #333;
}

#search-container {
    position: relative;
    display: flex;
    margin-bottom: 15px;
    padding: 0 10px;
    justify-content: start;
    width: 220px;
}

#search-input {
    width: 140px;
    max-width: 140px;
    flex: 0 1 140px;
    padding: 5px 30px 5px 10px;
    border: 1px solid #ccc;
    border-right: none;
    border-radius: 4px 0 0 4px;
    font-size: 14px;
    transition: all 0.3s ease;
} 

#search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(var(--primary-color-rgb), 0.2);
}

#search-input:focus~#search-button {
    border-color: var(--primary-color);
    background-color: var(--primary-color);
    color: white;
}

#search-input:focus~#search-button:hover {
    background-color: var(--primary-color-dark);
}

#search-clear {
    position: absolute;
    right: 55px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    color: #999;
    font-size: 14px; 
    display: none;
}

#search-clear:hover {
    color: #333;
}

#jTree li.hidden {
    display: none;
}

@media (max-width: 768px) {
    #sidetree {
        position: fixed;
        left: 0;
        top: 0;
        transform: translateX(-100%);
        z-index: 999;
    }

    #sidetree.active {
        transform: translateX(0);
    }

    #menu-toggle {
        display: block;
    }

    #content {
        margin-left: 0;
    }
}