* { box-sizing: border-box; }
body { margin: 0; padding: 0; display: flex; flex-direction: column; height: 100vh; background-color: #252526; color: #e0e0e0; font-family: 'Segoe UI', monospace; overflow: hidden; user-select: none; }

/* HEADER */
#header {
    height: 36px;
    min-height: 36px;
    background: #2d2d2d;
    border-bottom: 1px solid #444;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 10px;
    z-index: 100;
}
.header-left, .header-right { display: flex; align-items: center; gap: 10px; }
.header-center { font-size: 0.85rem; font-weight: bold; color: #4ec9b0; letter-spacing: 1px; }
.separator { color: #555; }
.zoom-control { display: flex; align-items: center; gap: 6px; font-size: 0.7rem; }
.zoom-control input[type=range] { width: 60px; margin: 0; }
.view-btns button, .res-btns button { padding: 4px 8px; font-size: 0.7rem; }
#header input[type=number] { width: 45px; padding: 2px 4px; font-size: 0.7rem; }

/* MAIN LAYOUT */
#main {
    flex: 1;
    display: flex;
    overflow: hidden;
}

/* LEFT TOOLBAR */
#toolbar {
    width: 44px;
    min-width: 44px;
    background: #2d2d2d;
    border-right: 1px solid #444;
    display: flex;
    flex-direction: column;
    padding: 6px 4px;
    gap: 4px;
    overflow-y: auto;
}
.tool-section { display: flex; flex-direction: column; gap: 2px; }
.tool-label { font-size: 0.55rem; color: #888; text-align: center; margin-bottom: 2px; text-transform: uppercase; }
.tool-divider { height: 1px; background: #444; margin: 6px 0; }
.tool-btn {
    width: 36px;
    height: 36px;
    background: #3e3e42;
    border: 1px solid #555;
    border-radius: 2px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.1s;
}
.tool-btn:hover { background: #4e4e52; border-color: #4ec9b0; }
.tool-btn.active { background: #0e639c; border-color: #0e639c; }
.tool-icon { font-size: 1.1rem; }

/* RIGHT SIDEBAR */
#sidebar {
    width: 280px;
    min-width: 280px;
    background: #333337;
    border-left: 1px solid #444;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    overflow-x: hidden;
}

/* PANELS */
.panel { border-bottom: 1px solid #444; }
.panel-header {
    background: #3a3a3e;
    padding: 8px 10px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
    font-weight: bold;
    color: #4ec9b0;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.panel-header:hover { background: #454548; }
.panel-header .chevron {
    font-size: 0.7rem;
    transition: transform 0.15s;
    width: 12px;
    display: inline-block;
    text-align: center;
    transform-origin: center center;
}
.panel .panel-header .chevron { transform: rotate(90deg); }
.panel.collapsed .panel-header .chevron { transform: rotate(0deg); }
.panel-body { padding: 10px; background: #2e2e32; }
.panel.collapsed .panel-body { display: none; }

/* SUBPANELS */
.subpanel { margin-top: 8px; border-top: 1px solid #444; padding-top: 6px; }
.subpanel-header {
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 0.7rem;
    color: #888;
    padding: 4px 0;
}
.subpanel-header:hover { color: #aaa; }
.subpanel-header .chevron { font-size: 0.6rem; width: 10px; transition: transform 0.15s; display: inline-block; text-align: center; transform-origin: center center; }
.subpanel-header.collapsed .chevron { transform: rotate(0deg); }
.subpanel-header:not(.collapsed) .chevron { transform: rotate(90deg); }
.subpanel-body { padding-top: 6px; }

/* ROWS & INPUTS */
.row { display: flex; justify-content: space-between; align-items: center; margin-bottom: 5px; font-size: 0.7rem; color: #ccc; }
.row > span:first-child { min-width: 65px; }
.value { color: #fff; font-weight: bold; }
.group { background: #3e3e42; padding: 8px; border-radius: 2px; border: 1px solid #444; }

input[type=range] { width: 100%; accent-color: #4ec9b0; margin: 3px 0; cursor: pointer; height: 16px; }
input[type=number], input[type=text] { background: #1e1e1e; border: 1px solid #444; color: white; padding: 3px 4px; font-family: inherit; border-radius: 2px; font-size: 0.7rem; }
input[type=number] { width: 50px; }
input[type=color] { width: 50px; height: 22px; padding: 0; border: 1px solid #444; cursor: pointer; }

/* CHECKBOX ROWS */
.checkbox-row {
    display: flex;
    gap: 10px;
    margin: 6px 0;
    font-size: 0.65rem;
}
.checkbox-row label {
    display: flex;
    align-items: center;
    gap: 3px;
    cursor: pointer;
    color: #aaa;
}
.checkbox-row input[type=checkbox] { width: 12px; height: 12px; margin: 0; accent-color: #4ec9b0; }

/* BUTTONS */
.btn-group { display: flex; gap: 3px; flex-wrap: wrap; }
button {
    background: #3e3e42;
    color: #fff;
    border: 1px solid #555;
    padding: 5px 8px;
    cursor: pointer;
    font-size: 0.7rem;
    font-weight: bold;
    transition: all 0.1s;
    border-radius: 2px;
}
button:hover { background: #4e4e52; border-color: #4ec9b0; }
button.active { background: #0e639c; border-color: #0e639c; }
button.danger { color: #f66; }
button.danger:hover { background: #442222; }
.export-btn { width: 100%; margin-bottom: 5px; padding: 8px; }
.export-btn.primary { background: #0e639c; }

/* OBJECT LIST */
#obj-list { background: #1a1a1a; border: 1px solid #333; max-height: 200px; overflow-y: auto; }
.obj-item { padding: 5px 8px; border-bottom: 1px solid #333; cursor: pointer; font-size: 0.75rem; display: flex; justify-content: space-between; align-items: center; background: #222; color: #ccc; gap: 6px; }
.obj-item:hover { background: #2a2a2a; }
.obj-item.selected { background: #2a2a2a; border-left: 3px solid #4ec9b0; color: #4ec9b0; }
.obj-item.hidden-obj { opacity: 0.5; }
.obj-item.group-header { background: #252530; border-left: 2px solid #9966ff; }
.obj-item.group-header.selected { background: #303040; border-left: 3px solid #9966ff; }
.obj-item.group-child { padding-left: 20px; background: #1e1e22; border-left: 1px solid #9966ff; }
.obj-item.group-child.selected { background: #282830; border-left: 3px solid #4ec9b0; }
.obj-item .eye { cursor: pointer; font-size: 0.85rem; opacity: 0.6; flex-shrink: 0; }
.obj-item .eye:hover { opacity: 1; }
.obj-item .collapse { cursor: pointer; font-size: 0.65rem; opacity: 0.7; margin-right: 3px; color: #9966ff; }
.obj-item .type-icon { font-size: 0.75rem; opacity: 0.5; margin-right: 3px; flex-shrink: 0; }
.obj-item .obj-name { flex-grow: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.obj-item .name-edit { flex-grow: 1; background: #111; border: 1px solid #4ec9b0; color: #fff; padding: 2px 4px; font-size: 0.75rem; font-family: inherit; outline: none; }
.obj-item .del { margin-left: auto; flex-shrink: 0; }

/* CANVAS AREA */
#canvas-wrapper { flex-grow: 1; background: #1a1a1a; display: flex; justify-content: center; align-items: center; overflow: auto; position: relative; }
canvas { background: #000; image-rendering: pixelated; box-shadow: 0 0 30px rgba(0,0,0,0.5); display: block; border: 1px solid #333; }
#coords { position: absolute; bottom: 8px; right: 8px; color: #4ec9b0; background: #000; padding: 3px 6px; font-size: 0.65rem; border: 1px solid #333; }

/* SCROLLBAR */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: #1e1e1e; }
::-webkit-scrollbar-thumb { background: #444; border-radius: 2px; }
::-webkit-scrollbar-thumb:hover { background: #555; }