:root {
    --bg: #0b0f12;
    --panel: #0f1417;
    --text: #e6eef6;
    --muted: #97a0ad;
    --accent: #60a5fa;
    --accent-focus: rgba(96,165,250,0.14);
    --btn-bg: rgba(255,255,255,0.02);
    --btn-border: rgba(255,255,255,0.04);
    --btn-hover-bg: rgba(255,255,255,0.035);
    --font-family: system-ui, 'Segoe UI', Roboto, sans-serif;
    --node-bg: #0f1720;
    --node-border: #24303a;
    --line: #445b6a;
    --arrow: #60a5fa;
    --workspace-bg: rgba(255,255,255,0.015);
    --workspace-border: rgba(255,255,255,0.04);
    --progress-track: rgba(255,255,255,0.03);

    --grid-size: 36px;
    --grid-major: 5;
    --grid-weak: rgba(255, 255, 255, 0.03);
    --grid-strong: rgba(255,255,255,0.06);
}

body.light {
    --bg: #f6f8fb;
    --panel: #ffffff;
    --text: #101010;
    --muted: #6b7280;
    --accent: #0077ff;
    --accent-focus: rgba(0,119,255,0.14);
    --btn-bg: rgba(0,0,0,0.03);
    --btn-border: rgba(0,0,0,0.06);
    --btn-hover-bg: rgba(0,0,0,0.04);
    --font-family: system-ui, 'Segoe UI', Roboto, sans-serif;
    --node-bg: #fff;
    --node-border: #ddd;
    --line: #cbd5e1;
    --arrow: #0077ff;
    --workspace-bg: #f5f5f5;
    --workspace-border: #dcdcdc;
    --progress-track: rgba(0,0,0,0.06);
    --grid-weak: rgba(0,0,0,0.035);
    --grid-strong: rgba(0,0,0,0.08);
}

body{
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-family);
    line-height: 1.35;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-weight: 800;
}

#workspace {
    margin-top: 26px;
    width: 100%;
    height: calc(100vh - 48px);
    border: 1px solid var(--workspace-border);
    overflow: hidden;
    position: relative;
    background: var(--workspace-bg);
}

#grid{
    position:absolute;
    inset:-5000px;
    pointer-events:none;
    background-image:
    linear-gradient(to right, var(--grid-strong) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-strong) 1px, transparent 1px),
    linear-gradient(to right, var(--grid-weak) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-weak) 1px, transparent 1px);
    background-size:
        100px 100px,
        100px 100px,
        20px 20px,
        20px 20px;
    transform-origin:0 0;
    z-index:0;
}

#viewport > *:not(#grid){
    position:relative;
    z-index:1;
}

#viewport {
    position: absolute;
    left: 0;
    top: 0;
    transform-origin: 0 0;
    background-position: 0 0, 0 0, 0 0, 0 0;
    mix-blend-mode: normal;
}

#connections {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: visible;
}

.node {
    position: absolute;
    width: 160px;
    padding: 10px;
    background: var(--node-bg);
    border: 1px solid var(--node-border);
    border-radius: 8px;
    cursor: grab;
    color: var(--text);
    box-shadow: 0 6px 18px rgba(2,6,23,0.35);
    transition: transform .12s ease, box-shadow .12s ease, border-color .12s ease;
}

.node:active {
    cursor: grabbing;
    transform: translateY(1px);
}

.node .node_title {
    font-size: 0.95rem;
    color: var(--text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.node.selected {
    border-color: var(--accent);
    box-shadow: 0 10px 30px rgba(0,0,0,0.25);
}

#add_node_templet {
    position: fixed;
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
    width: 28vw;
    max-width: 420px;
    min-width: 260px;
    max-height: 80vh;
    padding: 16px;
    background: var(--panel);
    border: 1px solid rgba(255,255,255,0.04);
    border-radius: 12px;
    z-index: 9999;
    box-sizing: border-box;
    overflow-y: auto;
    box-shadow: 0 10px 30px rgba(2,6,23,0.55);
    color: var(--text);
    transition: transform .22s cubic-bezier(.2,.9,.3,1), opacity .18s ease;
    backdrop-filter: blur(6px) saturate(120%);
}

#add_node_templet::before {
    content: "Create / Edit Node";
    display: block;
    font-weight: 700;
    font-size: 1rem;
    margin-bottom: 10px;
    color: var(--text);
    letter-spacing: 0.1px;
}

#add_node_templet input[type="text"] {
    width: 100%;
    padding: 10px 12px;
    margin: 8px 0;
    border-radius: 8px;
    border: 1px solid rgba(255,255,255,0.03);
    background: transparent;
    color: var(--text);
    box-sizing: border-box;
    outline: none;
    font-size: 0.95rem;
}

#add_node_templet input::placeholder {
    color: var(--muted);
}

#add_node_templet input:focus {
    border-color: var(--accent);
    box-shadow: 0 8px 30px rgba(0,0,0,0.25), 0 0 0 4px rgba(96,165,250,0.06);
}

button {
    font-size: 0.95rem;
    line-height: 1;
    background: var(--btn-bg);
    color: var(--text);
    border: 1px solid var(--btn-border);
    padding: 8px 12px;
    border-radius: 8px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: transform .12s ease, box-shadow .12s ease, background-color .12s ease, opacity .12s ease;
}

button:hover {
    background: var(--btn-hover-bg);
}

button:focus {
    outline: none;
    box-shadow: 0 0 0 4px var(--accent-focus);
}

#add_node_templet button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    font-weight: 700;
    font-size: 0.95rem;
    transition: transform .12s ease, box-shadow .12s ease, opacity .12s ease;
}

#add_node_button {
    width: 100%;
    background: linear-gradient(90deg, var(--accent) 0%, rgba(0,120,255,0.95) 100%);
    color: white;
    border-radius: 10px;
    padding: 10px 12px;
    box-shadow: 0 10px 28px rgba(96,165,250,0.14);
    margin-top: 6px;
}

#add_node_button:hover {
    transform: translateY(-1px);
}

#add_node_child_button, #add_task_button {
    background: var(--btn-bg);
    border: 1px solid var(--btn-border);
    color: var(--text);
    padding: 8px 10px;
    border-radius: 8px;
}

#add_node_child_button:hover, #add_task_button:hover {
    background: var(--btn-hover-bg);
}

#delete_node {
    background: transparent;
    border: 1px solid rgba(255,66,66,0.14);
    color: #ff6b6b;
    padding: 8px 10px;
    border-radius: 8px;
}

#delete_node:hover {
    background: rgba(255,66,66,0.06);
}

#add_node_templet.hidden {
    opacity: 0;
    pointer-events: none;
    transform: translateY(-50%) translateX(16px) scale(.995);
}

#selected_node_editing {
    margin-top: 14px;
    display: none;
    font-size: 0.95rem;
    color: var(--text);
}

#selected_node_editing.shown {
    display: block;
}

#selected_node_editing hr {
    border: none;
    height: 1px;
    background: linear-gradient(90deg, rgba(255,255,255,0.02), rgba(0,0,0,0.03));
    margin: 12px 0;
    border-radius: 1px;
}

#previous_task {
    margin-bottom: 8px;
    color: var(--muted);
    font-size: 0.95rem;
}

#previous_task > div {
    border: 1px solid rgba(255,255,255,0.03);
    padding: 8px;
    margin-bottom: 8px;
    display: flex;
    gap: 8px;
    align-items: flex-start;
    border-radius: 8px;
    background: linear-gradient(180deg, rgba(255,255,255,0.01), rgba(0,0,0,0.015));
}

#previous_task > div div {
    font-size: 0.85rem !important;
    color: var(--muted) !important;
}

#previous_task > div.completed {
    opacity: 0.6;
    text-decoration: line-through;
}

#add_node_templet::-webkit-scrollbar {
    width: 10px;
}

#add_node_templet::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.04);
    border-radius: 10px;
}

@media (max-width: 620px) {
    #add_node_templet {
        left: 50%;
        right: auto;
        top: 12vh;
        transform: translate(-50%, 0);
        width: calc(100% - 32px);
        max-width: none;
        max-height: 76vh;
        padding: 12px;
    }
}

.progress {
    position: absolute;
    left:8px; right:8px;
    bottom:8px;
    height:8px;
    background: var(--progress-track);
    border-radius:4px;
    overflow:hidden;
}

.progress .fill {
    height:100%;
    width:0%;
    background:var(--accent);
    transition:width .22s linear;
}

#menu_toggle {
    position:fixed;
    left:12px;
    top:12px;
    z-index:10000;
    width:40px;
    height:40px;
    border-radius:8px;
    border:1px solid rgba(255,255,255,0.06);
    background:var(--panel);
    box-shadow:0 4px 12px rgba(2,6,23,0.6);
    cursor:pointer;
    display:flex;
    align-items:center;
    justify-content:center;
    color:var(--text)
}

#site_menu {
    position:fixed;
    left:12px;
    top:64px;
    width:220px;
    max-width:calc(100% - 32px);
    background:var(--panel);
    border:1px solid rgba(255,255,255,0.03);
    box-shadow:0 10px 30px rgba(2,6,23,0.6);
    border-radius:8px;
    padding:12px;
    z-index:10000;
    transform:translateY(-8px);
    transition:opacity .18s ease, transform .18s ease;
    opacity:0;
    pointer-events:none;
}

#site_menu.open {
    opacity:1;
    transform:translateY(0);
    pointer-events:auto;
}

#site_menu ul {
    list-style:none;
    padding:0;
    margin:0;
    display:flex;
    flex-direction:column;
    gap:8px;
}

#site_menu a {
    display:block;
    border-radius:6px;
    padding:8px;
    color:var(--text);
    text-decoration:none;
    font-weight: 600;
}

#site_menu a:hover {
    background: rgba(96,165,250,0.06);
    color:var(--accent);
}

#site_menu .menu_footer {
    margin-top:12px;
    font-size:12px;
    color:var(--muted);
    border-top:1px solid rgba(255,255,255,0.03);
    padding-top:8px;
    display:flex;
    align-items:center;
    justify-content:space-between;
}

#theme_toggle {
    background:transparent;
    border:1px solid rgba(255,255,255,0.04);
    padding:6px 8px;
    border-radius:6px;
    color:var(--text);
    cursor:pointer;
}

#im_ex_port {
    padding-top: 24px;
    z-index: 10000;
    position: fixed;
    right: 24px;
    color:var(--muted);

}

#import_roadmap, #export_roadmap, #theme_toggle {
    border-radius: 8px;
    padding: 8px 10px;
    border: 1px solid var(--btn-border);
    background: var(--btn-bg);
    color: var(--text);
}

#import_roadmap:hover, #export_roadmap:hover {
    background: var(--btn-hover-bg);
}