#sidebar {
    width: 320px;
    background: #3c3c3c;
    border-right: 1px solid #1e1e1e;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar-header {
    background: #2b2b2b;
    padding: 12px 16px;
    border-bottom: 1px solid #1e1e1e;
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
}

.panel {
    border-bottom: 1px solid #2b2b2b;
}

.panel-header {
    background: #323232;
    padding: 10px 16px;
    cursor: pointer;
    user-select: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
    font-weight: 600;
}

.panel-header:hover {
    background: #3a3a3a;
}

.panel-header::after {
    content: '▼';
    font-size: 10px;
    transition: transform 0.2s;
}

.panel-header.collapsed::after {
    transform: rotate(-90deg);
}

.panel-body {
    padding: 12px 16px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.panel-body.collapsed {
    display: none;
}

.field {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.field-label {
    font-size: 11px;
    color: #999999;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.field input[type="number"],
.field input[type="text"] {
    width: 100%;
    background: #2b2b2b;
    border: 1px solid #1e1e1e;
    color: #cccccc;
    padding: 6px 8px;
    font-size: 12px;
    outline: none;
}

.field input[type="number"]:focus,
.field input[type="text"]:focus {
    border-color: #4a90e2;
}

.field-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.color-input-wrapper {
    display: flex;
    gap: 8px;
}

.color-input-wrapper input[type="color"] {
    width: 40px;
    height: 28px;
    border: none;
    background: none;
    cursor: pointer;
}

.color-input-wrapper input[type="text"] {
    flex: 1;
}

.btn {
    border: solid 1px #aeaeae;
    outline: 0;
    font-size: 13px;
    padding: 6px 10px;
    margin: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    box-sizing: border-box;
    background-color: #373737;
    color: #dad7d7;
    cursor: pointer;
    transition: background-color 0.2s, border-color 0.2s;
}

.btn:hover {
    background-color: #444;
}

.btn:active {
    background-color: #2e2e2e;
}

.btn-primary {
    border: solid 1px #FFD700;
    font-weight: 500;
}

.btn-danger {
    border: solid 1px #ff0000;
    font-weight: 500;
}

#toolbar {
    background: #3c3c3c;
    border-bottom: 1px solid #1e1e1e;
    padding: 8px 12px;
    display: flex;
    gap: 8px;
    align-items: center;
}

.toolbar-group {
    display: flex;
    gap: 4px;
    padding: 0 8px;
    border-right: 1px solid #2b2b2b;
}

.toolbar-group:last-child {
    border-right: none;
}

.tool-btn {
    border: solid 1px #aeaeae;
    outline: 0;
    font-size: 13px;
    padding: 6px 10px;
    margin: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    box-sizing: border-box;
    background-color: #373737;
    color: #dad7d7;
    cursor: pointer;
    transition: background-color 0.2s, border-color 0.2s;
    min-width: 70px;
}

.tool-btn:hover {
    background-color: #444;
}

.tool-btn:active {
    background-color: #2e2e2e;
}

.tool-btn.active {
    border: solid 1px #FFD700;
    background-color: #444;
    color: #fff;
    font-weight: 500;
}

#canvasArea {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: #2b2b2b;
}

#canvasContainer {
    flex: 1;
    position: relative;
    overflow: hidden;
    background: #505050;
}

#gameCanvas {
    position: absolute;
    cursor: crosshair;
}