* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    background: white;
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    max-width: 1800px;
    width: 100%;
    margin: 0 auto;
}

.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-top: 20px;
    align-items: stretch; /* 确保左右面板等高并填充 */
    min-height: calc(100vh - 200px);
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 20px;
    font-size: 28px;
}

/* 左侧面板 */
.left-panel {
    display: flex;
    flex-direction: column;
    min-width: 0; /* 防止 flex 子元素溢出 */
    height: calc(100vh - 200px); /* 显式设置高度 */
}

/* 右侧面板 */
.right-panel {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
}

.canvas-container {
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background: #f5f5f5;
    border-radius: 8px; /* 恢复圆角 */
    padding: 20px;
    position: sticky;
    top: 20px;
    max-height: calc(100vh - 200px);
    overflow: hidden; 
}

#glCanvas {
    display: block;
    width: 100%;
    max-width: 100%;
    height: auto;
    border: 2px solid #ddd;
    border-radius: 4px; /* 恢复圆角 */
    background: #000;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.controls {
    text-align: center;
    margin-top: 20px;
    flex-shrink: 0;
    position: relative; /* 添加相对定位 */
}

.control-row {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
    flex-wrap: wrap;
    margin-bottom: 15px;
}

.auto-apply-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    user-select: none;
    padding: 8px 12px;
    border-radius: 6px;
    transition: background 0.2s;
}

.auto-apply-toggle:hover {
    background: #f0f0f0;
}

.auto-apply-toggle input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: #667eea;
}

.auto-apply-toggle span {
    font-size: 14px;
    color: #333;
}

button {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 12px 30px;
    font-size: 16px;
    border-radius: 6px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    margin-bottom: 15px;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

button:active {
    transform: translateY(0);
}

.info {
    margin-top: 15px;
    color: #666;
    font-size: 14px;
    line-height: 1.6;
}

.info p {
    margin: 5px 0;
}

/* 着色器编辑器容器 */
.shader-editor-container {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 0;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    overflow: hidden;
    background: #f8f9fa;
}

/* 标签页导航 */
.tab-nav {
    display: flex;
    background: #f0f0f0;
    border-bottom: 2px solid #e0e0e0;
}

.tab-btn {
    flex: 1;
    padding: 12px 20px;
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    color: #666;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    margin: 0;
    border-radius: 0;
}

.tab-btn:hover {
    background: #e8e8e8;
    color: #333;
}

.tab-btn.active {
    background: white;
    color: #667eea;
    border-bottom-color: #667eea;
}

.tab-btn:active {
    transform: none;
    box-shadow: none;
}

/* 标签页内容 */
.tab-content {
    flex: 1;
    position: relative;
    min-height: 0;
}

.tab-pane {
    display: none;
    height: 100%;
    flex-direction: column;
    min-height: 0;
    overflow: hidden;
}

.tab-pane.active {
    display: flex;
}

.shader-panel {
    border: none;
    border-radius: 0;
    overflow: hidden;
    background: transparent;
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 0;
    height: 100%;
}

.editor-wrapper {
    display: flex;
    flex: 1;
    position: relative;
    background: #272822; /* 匹配 monokai 主题背景 */
    overflow: hidden;
    height: 100%; /* 确保 wrapper 填满父级 */
}

/* CodeMirror 样式覆盖 */
.CodeMirror {
    width: 100%;
    height: 100% !important; /* 强制填满父容器 */
    flex: 1;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.6;
}

.line-numbers {
    display: none; /* 移除原来的行号 */
}

.shader-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 12px 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
}

.header-actions {
    display: flex;
    gap: 8px;
}

.shader-header h3 {
    margin: 0;
    font-size: 16px;
    font-weight: 600;
}

.btn-small {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 6px 12px;
    font-size: 12px;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.2s;
}

.btn-small:hover {
    background: rgba(255, 255, 255, 0.3);
}

.shader-editor:focus {
    background: #252526;
}

/* 隐藏不再需要的 textarea 样式 */
.shader-editor {
    display: none;
}

/* 优化错误显示：移动到右侧 Canvas 上方悬浮 */
.error-display {
    position: absolute;
    bottom: 30px;
    left: 30px;
    right: 30px;
    margin: 0;
    padding: 15px;
    border-radius: 8px;
    background: rgba(255, 245, 245, 0.95);
    border: 1px solid #fcc;
    border-left: 6px solid #f44;
    color: #c33;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.5;
    display: none;
    white-space: pre-wrap;
    word-wrap: break-word;
    z-index: 1000;
    box-shadow: 0 8px 30px rgba(0,0,0,0.2);
    max-height: 40%;
    overflow-y: auto;
    backdrop-filter: blur(4px);
}

.error-display.show {
    display: block;
}

.error-display.success {
    background: rgba(245, 255, 245, 0.95);
    border-color: #cfc;
    border-left-color: #4c4;
    color: #363;
}

/* 响应式设计 */
@media (max-width: 1400px) {
    .main-content {
        grid-template-columns: 1fr;
    }
    
    .canvas-container {
        position: static;
        margin-top: 20px;
    }
    
    .right-panel {
        order: -1; /* 在小屏幕上，canvas 显示在上方 */
    }
}

@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    h1 {
        font-size: 22px;
    }
    
    .shader-editor {
        font-size: 12px;
        padding: 10px;
    }
    
    .control-row {
        flex-direction: column;
        gap: 10px;
    }
    
    button {
        width: 100%;
        margin-bottom: 0;
    }
}