body {
    margin: 0;
    padding: 0;
    font-family: "Segoe UI", Arial, sans-serif;
    background: #fafafa;
}

#main-layout {
    display: flex;
    height: 100vh;
    width: 100vw;
    min-width: 600px;
    position: relative;
    background: #f7f9fc;
}

#controls {
    flex-basis: 500px;
    min-width: 300px;
    max-width: 900px;
    background: #fff;
    border-right: 1px solid #e0e0e0;
    padding: 16px;
    overflow-y: auto;
    height: 100vh;
    box-sizing: border-box;
    transition: flex-basis 0.2s;
    /* 阴影美化 */
    box-shadow: 2px 0 8px rgba(0,0,0,0.04);
}

#splitter {
    width: 8px;
    background: linear-gradient(90deg,#e0e0e0 60%,#b0b0b0 100%);
    cursor: ew-resize;
    height: 100vh;
    z-index: 10;
    position: relative;
    transition: background 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}
#splitter:hover {
    background: linear-gradient(90deg,#b0b0b0 60%,#e0e0e0 100%);
}
#splitter::after {
    content: "";
    display: block;
    width: 2px;
    height: 32px;
    background: #1976d2;
    border-radius: 2px;
    opacity: 0.3;
}

#canvas-container {
    flex: 1 1 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #f5f5f5;
    height: 100vh;
    min-width: 320px;
    transition: flex-basis 0.2s;
    box-shadow: -2px 0 8px rgba(0,0,0,0.03);
}

#canvas {
    background: #fff;
    border: 1px solid #ccc;
    box-shadow: 0 2px 8px rgba(0,0,0,0.07);
    width: 100%;
    height: 100%;
    display: block;
    object-fit: contain;
    border-radius: 8px;
}

.fixed-btn {
    position: fixed;
    right: 20px;
    padding: 8px 16px;
    background: #4caf50;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 500;
    box-shadow: 0 2px 8px rgba(33,150,243,0.07);
    transition: background 0.2s;
}

.fixed-btn:hover {
    background: #388e3c;
}

#saveBtn {
    bottom: 20px;
}

#backBtn {
    bottom: 70px;
    background: #1976d2;
}

#backBtn:hover {
    background: #1565c0;
}


#resetBtn {
    bottom: 120px;
    background: #ff9800;
}

#resetBtn:hover {
    background: #f57c00;
}

#controls label {
    margin-left: 8px;
    font-size: 14px;
}

#controls input[type="checkbox"] {
    margin-left: 8px;
}

#controls .bold {
    font-weight: bold;
}

/* 节点树美化 */
.tree-node {
    margin-bottom: 0;
    padding: 0 0 0 4px; /* 去掉垂直方向的空白，左侧缩进更小 */
    border-radius: 2px;
    transition: background 0.15s;
    position: relative;
    background: #f8fbff;
    font-size: 13px;
    box-shadow: none;
    border-left: 1px solid #e3eafc; /* 更细的左边线 */
}

.tree-node:hover {
    background: #e3f2fd;
    box-shadow: none;
}

.tree-node .tree-toggle {
    font-size: 13px;
    color: #1976d2;
    margin-right: 2px;
    cursor: pointer;
    user-select: none;
    display: inline-block;
    width: 12px;
    text-align: center;
    transition: color 0.2s;
    padding: 0; /* 去掉内部空白 */
}
.tree-node .tree-toggle:hover {
    color: #1565c0;
}

.tree-node .tree-title {
    font-weight: 500;
    font-size: 13px;
    margin-right: 2px;
    color: #1976d2;
    letter-spacing: 0.1px;
    vertical-align: middle;
    padding: 4px; /* 恢复左右间距 */
}

.tree-node .tree-checkbox {
    margin-left: 4px;
    vertical-align: middle;
    accent-color: #1976d2;
    transform: scale(1);
    padding: 0; /* 去掉内部空白 */
}

.tree-children {
    margin-left: 16px; /* 增加缩进，布局更宽松 */
    border-left: 1px dashed #e0e0e0;
    padding-left: 0;
    transition: border-color 0.2s;
}

.tree-group-title {
    font-size: 13px;
    font-weight: bold;
    color: #1565c0;
    margin-bottom: 2px;
    margin-top: 4px;
    letter-spacing: 0.3px;
    padding: 0;
}

.tree-parent-group {
    margin-bottom: 12px;
}

.tree-header {
    display: flex;
    align-items: center;
    font-weight: bold;
    font-size: 14px;
    color: #1565c0;
    margin-bottom: 4px;
}

.tree-toggle {
    margin-right: 6px;
    user-select: none;
    transition: transform 0.2s;
}

.thumb-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: 8px;
    padding: 8px 0;
}

.thumb-node {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    /* 移除边框 */
    border: none;
    border-radius: 8px;
    background: #fff;
    cursor: pointer;
    padding: 4px 2px;
    transition: border 0.2s, background 0.2s;
}

.thumb-node.selected {
    border-color: #1976d2;
    background: #e3f2fd;
}

.thumb-img {
    width: 48px;
    height: 48px;
    object-fit: contain;
    border-radius: 4px;
    background: #f5f5f5;
    margin-bottom: 4px;
}

.thumb-name {
    font-size: 12px;
    text-align: center;
    color: #1976d2;
    font-weight: 500;
    word-break: break-all;
    margin-top: 2px;
}

::-webkit-scrollbar {
    width: 8px;
    background: #eee;
}
::-webkit-scrollbar-thumb {
    background: #ccc;
    border-radius: 4px;
}

/* 可拖动分割线 */
#splitter {
    width: 6px;
    background: #e0e0e0;
    cursor: ew-resize;
    height: 100vh;
    z-index: 10;
    position: relative;
}

.thumb-node {
    box-shadow: 0 2px 8px rgba(33,150,243,0.07);
    transition: border 0.2s, background 0.2s;
}
.thumb-node:hover {
    border-color: #42a5f5;
    background: #e3f2fd;
}

#role-selector {
    display: flex;
    flex-direction: column;
    min-height: 100vh; /* allow centering while still permitting content taller than viewport */
    background: #f7f9fc;
    overflow-y: auto;
    align-items: center;    /* 水平居中 */
    justify-content: center; /* 垂直居中 */
    padding: 24px 12px;
}

#role-selector h2 {
    margin-bottom: 40px;
    color: #1976d2;
    font-size: 24px;
}

#roles-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    max-width: 1200px;
    width: 100%;
}

.role-item {
    margin: 20px;
    text-align: center;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    padding: 16px;
    transition: transform 0.2s;
}

.role-item:hover {
    transform: translateY(-4px);
}

.role-item img {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    border: 2px solid #1976d2;
    object-fit: cover;
}

.role-item button {
    margin-top: 10px;
    padding: 8px 16px;
    background: #1976d2;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 500;
    transition: background 0.2s;
}

.role-item button:hover {
    background: #1565c0;
}

.role-item .role-content {
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.role-item .role-name {
    margin-top: 10px;
    font-weight: 500;
    color: #1976d2;
}

.role-item a {
    text-decoration: none;
    color: inherit;
}

/* 响应式：在窄屏设备上将布局纵向化，控件挪到顶部，隐藏分割条，调整按钮位置 */
@media (max-width: 800px) {
    #main-layout {
        flex-direction: column;
        height: auto;
        min-width: 0;
    }
    #controls {
        flex-basis: auto !important;
        width: 100%;
        max-width: 100%;
        height: auto;
        position: relative;
        box-shadow: none;
        border-right: none;
        border-bottom: 1px solid #e8eaf6;
        padding-bottom: 12px;
    }
    #splitter { display: none; }
    #canvas-container {
        width: 100%;
        height: calc(100vh - 220px);
        min-width: 0;
        padding: 12px;
        box-sizing: border-box;
    }
    #canvas { border-radius: 6px; height: 100%; }

    /* 隐藏桌面风格的 fixed 按钮（移动端使用抽屉按钮） */
    .fixed-btn { display: none; }

    /* 抽屉内按钮样式 */
    .drawer-btn {
        margin: 8px 8px 0 0;
        padding: 10px 14px;
        border-radius: 8px;
        border: none;
        background: #1976d2;
        color: white;
        font-weight: 600;
    }
    .drawer-btn:nth-child(1) { background: #4caf50; }
    .drawer-btn:nth-child(2) { background: #1976d2; }
    .drawer-btn:nth-child(3) { background: #ff9800; }

    /* 缩小缩略图与文字，增加可点面积 */
    .thumb-img { width: 40px; height: 40px; }
    .thumb-name { font-size: 11px; }
    .thumb-node { padding: 6px; border-radius: 8px; }
}

/* 移动端底部抽屉 */
#mobile-drawer {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 40;
    display: none; /* 默认在桌面隐藏 */
}

/* 抽屉默认关闭状态（只显示手柄） */
#mobile-drawer.drawer-closed {
    height: 48px;
}

/* 抽屉打开（覆盖一部分屏幕） */
#mobile-drawer.drawer-open {
    height: 50vh;
}

#drawer-handle, #drawer-handle {
    height: 48px;
    background: linear-gradient(90deg,#e8eefc,#f7fbff);
    text-align: center;
    line-height: 48px;
    color: #1976d2;
    font-weight: 600;
    border-top: 1px solid rgba(0,0,0,0.03);
    border-left: 1px solid rgba(0,0,0,0.02);
    border-right: 1px solid rgba(0,0,0,0.02);
}

/* 视觉化手柄条 */
#drawer-handle {
    display: flex;
    align-items: center;
    justify-content: center;
}
.drawer-handle-bar {
    width: 56px;
    height: 6px;
    background: #cfd8e3;
    border-radius: 6px;
    box-shadow: inset 0 -1px 0 rgba(255,255,255,0.6);
}

/* 屏幕阅读器可见文本（视觉隐藏） */
.sr-only {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

#drawer-content {
    background: #fff;
    border-top-left-radius: 12px;
    border-top-right-radius: 12px;
    padding: 12px;
    box-shadow: 0 -6px 24px rgba(0,0,0,0.08);
    overflow: auto;
    height: calc(100% - 48px);
}

/* 在小屏时显示抽屉 */
@media (max-width: 800px) {
    #mobile-drawer { display: block; }
    /* canvas 覆盖底层并可视为全屏，抽屉浮在上面 */
    #canvas-container {
        position: fixed;
        left: 0;
        right: 0;
        top: 0;
        bottom: 0;
        height: 100vh;
        z-index: 10;
        display: flex;
        align-items: center;
        justify-content: center;
        padding: 0;
    }
    #canvas { width: 100% !important; height: 100% !important; border-radius: 0; }
}