:root {
    --sidebar-width: 260px;
    --transition-speed: 0.3s;
    /* Light theme */
    --bg: #f5f5f5;
    --text: #222;
    --sidebar-bg: #ffffff;
    --sidebar-text: #222;
    --tooltip-bg: #222;
    --tooltip-text: #fff;
    --menu-item-bg: #f5f5f5;
    --menu-item-text: #222;
    --menu-item-bgh: #d5d5d5;
    --titlebar-bg: #f6f6f6;
    --titlebar-text: #222;
    --border-color: #d5d5d5;
    --primaryButtonBg: #3455c8;
    --primaryButtonText: #ffffff;
    --primaryButtonBgHover: #5F7AD9;
    --secondaryButtonBg: #e85050;
    --secondaryButtonText: #ffffff;
    --secondaryButtonBgHover: #b74444;
    --input-border: #ccc;
    --input-border-hover: #5F7AD9;
    --error-text: #d93025;
    --success-text: #4CAF50;
    --main-anchors: #006699;
    --main-anchors-visited: #006699;
    --main-anchors-hover: #808000;
    --breadcrumb-background: #f6f6f6;
    --breadcrumb-crumb-color: #555;
    --breadcrumb-crumb-active: #111;
    --breadcrumb-hover-bg: rgba(0,0,0,0.05);
    --breadcrumb-shadow: 0 2px 4px rgba(0,0,0,0.08);
    --collapse-panel-bg: #ffffff;
    --collapse-panel-text: #333;
    --collapse-panel-hover: rgba(0,0,0,0.05);
    --collapse-panel-shadow: 0 2px 6px rgba(0,0,0,0.08);
    --collapse-panel-desc: #666;
    --action-tile-bg: #f2f2f2;
    --action-tile-text: #222;
    --action-tile-desc: #666;
    --action-tile-hover: rgba(0,0,0,0.2);
    --action-tile-focus-ring: #4da3ff;
    --action-tile-box-shadow: 0 2px 6px rgba(0,0,0,0.08);
    --action-tile-separator: #ddd;
    --data-table-border: #ddd;
    --data-table-panel-bg: #ffffff;
    --data-table-text: #222;
    --data-table-header-bg: #f3f3f3;
    --data-table-header-text: #111;
    --data-table-hover-bg: #f0f0f0;
    --data-table-row-alt: #fafafa;
    --sort-indicator: #888;
    --sort-indicator-active: #000;
    --pagination-bg: #f3f3f3;
    --pagination-border: #ccc;
    --pagination-text: #333;
    --pagination-active-bg: #ddd;
    --pagination-active-text: #000;
    --search-bg: #ffffff;
    --search-border: #d0d0d0;
    --search-text: #222;
    --search-placeholder: #888;
    --search-icon: #555;
    --search-icon-hover: #1a73e8;
    --search-focus-border: #4a8cff;
    --search-shadow: rgba(0, 0, 0, 0.08);
    --ui-bg: #fff;
    --ui-border: #d0d5dd;
    --ui-border-hover: #b6bcc7;
    --ui-border-focus: #4a8bff;
    --ui-text: #1a1a1a;
    --ui-radius: 10px;
    --ui-padding-y: 0.25rem;
    --ui-padding-x: 0.75rem;
    --ui-shadow-inset: inset 0 1px 2px rgba(0,0,0,0.06);
    --dlg-bg: #fff;
    --dlg-radius: 14px;
    --dlg-shadow: 0 8px 28px rgba(0,0,0,0.18);
    --dlg-border: 1px solid rgba(0,0,0,0.08);
    --dlg-padding: 1.25rem;
    --dlg-backdrop: rgba(0,0,0,0.45);
    --toolbar-bg: #f7f7f7;
    --toolbar-border: #ddd;
    --toolbar-btn-bg: #fff;
    --toolbar-btn-text: #222;
    --toolbar-btn-border: #ccc;
    --toolbar-btn-hover-bg: #f0f0f0;
    --toolbar-btn-hover-border: #bbb;
    --toolbar-btn-active-bg: #e5e5e5;
    --info-bg: #e8f3ff;
    --info-border: #bcdcff;
    --info-icon-bg: #2d7df4;
    --info-icon-color: #ffffff;
    --info-header: #0f3d8c;
    --info-text: #1a1a1a;
    --banner-bg: #eef5ff;
    --banner-border: #c9ddff;
    --banner-icon-bg: #2d7df4;
    --banner-icon-color: #ffffff;
    --banner-title: #0f3d8c;
    --banner-subtitle: #333333;
    --banner-btn-bg: #ffffff;
    --banner-btn-border: #b7c7e6;
    --banner-btn-hover-bg: #f3f6fb;
    --banner-btn-hover-border: #9fb4d8;
    --banner-btn-text: #0f3d8c;
    --upload-bg: #fafafa;
    --upload-border: #c7c7c7;
    --upload-border-hover: #2d7df4;
    --upload-text: #333;
    --upload-accent: #2d7df4;
    --viewer-bg: #ffffff;
    --viewer-text: #1a1a1a;
    --viewer-border: #d0d0d0;
    --highlight-info-bg: #e8f4ff;
    --highlight-info-text: #0b4f8a;
    --highlight-warn-bg: #fff8e1;
    --highlight-warn-text: #8a6d00;
    --highlight-error-bg: #ffecec;
    --highlight-error-text: #a30000;
    --tree-text: #1a1a1a;
    --tree-bg-hover: #f2f4f7;
    --tree-border: #d0d7de;
    --tree-accent: #2563eb;
    --tree-indent: 1.25rem;
}

body.dark {
    --bg: #1e1e1e;
    --text: #e5e5e5;
    --sidebar-bg: #111;
    --sidebar-text: #e5e5e5;
    --tooltip-bg: #fff;
    --tooltip-text: #111;
    --menu-item-bg: #1e1e1e;
    --menu-item-text: #e5e5e5;
    --menu-item-bgh: #393939;
    --titlebar-bg: #1e1f22;
    --titlebar-text: #fff;
    --border-color: #393939;
    --primaryButtonBg: #1E90ff;
    --primaryButtonText: #ffffff;
    --primaryButtonBgHover: #1b70c3;
    --secondaryButtonText: #ffffff;
    --secondaryButtonBg: #e85050;
    --secondaryButtonBgHover: #b74444;
    --input-border: #ccc;
    --input-border-hover: #1b70c3;
    --error-text: #d93025;
    --success-text: #4CAF50;
    --main-anchors: #3a8cd8;
    --main-anchors-visited: #3a8cd8;
    --main-anchors-hover: #2d9be0;
    --breadcrumb-background: #1e1f22;
    --breadcrumb-crumb-color: #c7c9cc;
    --breadcrumb-crumb-active: #ffffff;
    --breadcrumb-hover-bg: rgba(255,255,255,0.08);
    --breadcrumb-shadow: 0 2px 6px rgba(0,0,0,0.55);
    --collapse-panel-bg: #2a2b2f;
    --collapse-panel-text: #e0e0e0;
    --collapse-panel-hover: rgba(255,255,255,0.08);
    --collapse-panel-shadow: 0 2px 6px rgba(0,0,0,0.45);
    --collapse-panel-desc: #9a9ca1;
    --action-tile-bg: #232427;
    --action-tile-text: #e0e0e0;
    --action-tile-desc: #9a9ca1;
    --action-tile-hover: rgba(255,255,255,0.08);
    --action-tile-focus-ring: #61dafb;
    --action-tile-box-shadow: 0 2px 6px rgba(0,0,0,0.45);
    --action-tile-separator: #444;
    --data-table-border: #333;
    --data-table-panel-bg: #1e1e1e;
    --data-table-text: #e0e0e0;
    --data-table-header-bg: #2a2a2a;
    --data-table-header-text: #ffffff;
    --data-table-hover-bg: #333;
    --data-table-row-alt: #252525;
    --sort-indicator: #888;
    --sort-indicator-active: #fff;
    --pagination-bg: #2a2a2a;
    --pagination-border: #444;
    --pagination-text: #ddd;
    --pagination-active-bg: #444;
    --pagination-active-text: #fff;
    --search-bg: #1e1e1e;
    --search-border: #3a3a3a;
    --search-text: #e6e6e6;
    --search-placeholder: #777;
    --search-icon: #bbb;
    --search-icon-hover: #8ab4f8;
    --search-focus-border: #6aa8ff;
    --search-shadow: rgba(0, 0, 0, 0.4);
    --ui-bg: #1f1f1f;
    --ui-border: #3a3a3a;
    --ui-border-hover: #4a4a4a;
    --ui-text: #e6e6e6;
    --ui-shadow-inset: inset 0 1px 2px rgba(255,255,255,0.06);
    --dlg-bg: #1f1f1f;
    --dlg-border: 1px solid rgba(255,255,255,0.08);
    --dlg-shadow: 0 8px 28px rgba(0,0,0,0.6);
    --dlg-backdrop: rgba(0,0,0,0.65);
    --toolbar-bg: #2A2C2F;
    --toolbar-border: #3A3B3D;
    --toolbar-btn-bg: #3A3C3F;
    --toolbar-btn-text: #FFFFFF;
    --toolbar-btn-border: #4A4C4F;
    --toolbar-btn-hover-bg: #4A4C50;
    --toolbar-btn-hover-border: #5A5C60;
    --toolbar-btn-active-bg: #5A5C60;
    --info-bg: #1f2a38;
    --info-border: #2f3b4c;
    --info-icon-bg: #4a90ff;
    --info-icon-color: #ffffff;
    --info-header: #a8c7ff;
    --info-text: #d6d8db;
    --banner-bg: #1f2a38;
    --banner-border: #2f3b4c;
    --banner-icon-bg: #4a90ff;
    --banner-icon-color: #ffffff;
    --banner-title: #a8c7ff;
    --banner-subtitle: #d6d8db;
    --banner-btn-bg: #2a3444;
    --banner-btn-border: #3a4658;
    --banner-btn-hover-bg: #344155;
    --banner-btn-hover-border: #4a5870;
    --banner-btn-text: #d6e2ff;
    --upload-bg: #1f1f1f;
    --upload-border: #3a3a3a;
    --upload-border-hover: #4a90ff;
    --upload-text: #e0e0e0;
    --upload-accent: #4a90ff;
    --viewer-bg: #1b1b1b;
    --viewer-text: #e0e0e0;
    --viewer-border: #3a3a3a;
    --highlight-info-bg: #0f2a3d;
    --highlight-info-text: #7cc7ff;
    --highlight-warn-bg: #3d2f00;
    --highlight-warn-text: #ffd75e;
    --highlight-error-bg: #3a0000;
    --highlight-error-text: #ff8a8a;
    --tree-text: #e5e7eb;
    --tree-bg-hover: #2a2f36;
    --tree-border: #3d444d;
    --tree-accent: #60a5fa;
}


* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-size: 16px;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: Arial, sans-serif;
    transition: background var(--transition-speed), color var(--transition-speed);
}

.app-header {
    display: flex;
    align-items: center;
    gap: .5rem;
    padding: .6rem;
    background: var(--sidebar-bg);
    overflow: visible;
    height: auto;
}


.layout {
    display: flex;
    min-height: 100vh;
}


.sidebar-desktop {
    width: max-content;
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    transition: width 0.3s ease;
    overflow: hidden;
}

    .sidebar-desktop.closed {
        width: 0;
        padding: 0;
    }


/* --- Mobile Sidebar (hidden by default) --- */
.sidebar-mobile {
    position: fixed;
    top: 0; /* below top bar */
    left: 0;
    width: max-content;
    height: 100%;
    max-width: 80vw;
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    z-index: 1500;
}

    .sidebar-mobile.open {
        transform: translateX(0);
    }

/* --- Mobile Overlay --- */
.mobile-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    z-index: 1400;
}

    .mobile-overlay.visible {
        opacity: 1;
        pointer-events: auto;
    }

/* --- Main Content --- */
.content {
    flex: 1;
    min-width: 0;
    overflow-y: auto;
}

.mobile-hide {
    display: block;
}

.mobile-show {
    display: none;
}

@media (max-width: 768px) {
    .sidebar-desktop {
        display: none;
    }

    .mobile-hide {
        display: none !important;
    }

    .mobile-show {
        display: block !important;
    }
    .tb-label {
        display: none;
    }
}



/* --- Media Queries --- */
@media (min-width: 769px) {
    .sidebar-mobile,
    .mobile-overlay {
        display: none;
    }
}


h1, h2, h3, h4, h5, h6 {
    font-size: 16px;
}

.theme-menu {
    position: relative;
    /*margin-left: auto;*/
    overflow: visible;
}

.account-menu {
    position: relative;
    margin-left: auto;
    overflow: visible;
}

.theme-button {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    border-radius: 6px;
    padding: 0.2rem .3rem;
    color: var(--text);
    padding-right: 15px;
}

    .theme-button:hover {
        background: var(--primaryButtonBgHover);
    }

.theme-dropdown {
    position: absolute;
    right: 0;
    top: 102%;
    background: var(--bg);
    border: 1px solid var(--input-border);
    border-radius: 6px;
    display: none;
    flex-direction: column;
    z-index: 2000;
    opacity: 0;
    transform: translateY(-10px);
    max-height: 0;
    overflow: hidden;
    pointer-events: none;
    transition: opacity 0.25s ease, transform 0.25s ease, max-height 0.25s ease;
}
    .theme-dropdown.left {
        left: 0;
        right: auto;
    }

    .theme-dropdown.open {
        opacity: 1;
        transform: translateY(0);
        max-height: 500px;
        pointer-events: auto;
    }

    .theme-dropdown button {
        background: var(--menu-item-bg);
        border: none;
        padding: 0.3rem .5rem;
        text-align: left;
        cursor: pointer;
        color: var(--menu-item-text);
        width: 100%;
    }

        .theme-dropdown button:hover {
            background: var(--menu-item-bgh);
        }

    .theme-dropdown.open {
        display: flex;
    }

.hamburger {
    width: 28px;
    height: 28px;
    background: none;
    border: none;
    cursor: pointer;
    position: relative;
    border-radius: 6px;
}

    .hamburger:hover {
        background: var(--primaryButtonBgHover);
    }

    .hamburger span,
    .hamburger::before,
    .hamburger::after {
        content: "";
        position: absolute;
        width: 18px;
        height: 3px;
        background: var(--text);
        transition: transform 0.3s, opacity 0.3s;
    }

    .hamburger span {
        top: 50%;
        transform: translateY(-50%);
        left: 5px;
    }

    .hamburger::before {
        top: 6px;
        left: 5px;
    }

    .hamburger::after {
        bottom: 6px;
        left: 5px;
    }

.nav-links {
    list-style: none;
    padding: 0px;
    margin: 0px;
}

    .nav-links li {
        margin: 0 0;
        transition: transform 0.25s ease;
        border-left: 4px solid transparent;
    }

    .nav-links a,
    .nav-links a:link,
    .nav-links a:visited,
    .nav-links a:active {
        display: flex;
        white-space: nowrap;
        align-items: center;
        color: var(--sidebar-text);
        text-decoration: none;
        position: relative;
        padding: 10px 12px 10px 7px;
        transition: transform 0.25s ease;
    }

    .nav-links li:hover {
        background: var(--menu-item-bgh);
        /*border-left: 4px solid transparent;*/
        /* transform: translateX(3px); */
    }

    .nav-links a:hover img {
        /*background: var(--menu-item-bgh);*/
        /*border-left: 4px solid transparent;*/
        transform: translateX(3px);
    }

.nav-links-left-color:hover {
    border-left: 4px solid var(--primaryButtonBgHover);
}

.nav-links-left-color.selected {
    background: var(--menu-item-bgh);
    border-left: 4px solid var(--primaryButtonBgHover);
}

.nav-links i {
    font-size: 1.4rem;
    width: 24px;
    text-align: center;
}

.nav-links img {
    width: 24px;
    margin-right: 10px;
    transition: transform 0.25s ease;
}

.nav-links a .tooltip {
    position: absolute;
    left: calc(24px + 20px);
    background: var(--tooltip-bg);
    color: var(--tooltip-text);
    padding: 6px 10px;
    border-radius: 4px;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-50%);
    top: 50%;
    transition: opacity 0.2s;
}

.nav-link {
    background: var(--menu-item-bg);
    border: none;
    border-bottom: 1px solid var(--menu-item-text);
    border-left: 4px solid transparent;
    padding: 0.3rem .5rem;
    text-align: left;
    cursor: pointer;
    color: var(--menu-item-text);
    width: 100%;
}

    .nav-link:hover {
        background: var(--menu-item-bgh);
        border-left: 4px solid transparent;
    }

    .nav-link.leftcolor:hover {
        border-left: 4px solid transparent;
    }

.theme-toggle {
    margin-left: auto;
    cursor: pointer;
    background: none;
    border: none;
    font-size: 1.4rem;
    color: var(--text);
}

.sidebar-title {
    background: var(--titlebar-bg);
    color: var(--titlebar-text);
    align-items: center;
    padding: .3rem .2rem;
    display: flex;
    box-shadow: 0 2px 4px rgba(0,0,0,0.08);
}

.sidebar-title-close {
    position: relative;
    margin-left: auto;
    right: 0;
    background: none;
    border: none;
    font-size: 1rem;
    color: var(--titlebar-text);
    cursor: pointer;
    padding: 0.2rem .3rem;
    border-radius: 3px;
}

    .sidebar-title-close:hover {
        background: var(--primaryButtonBgHover);
    }