:root {
    color-scheme: light;

    --bg-color: #f0f2f5;
    --danger-bg-color: #680e0e;
    --container-bg: #ffffff;
    --text-color: #333;
    --border-color: #d9d9d9;
    --primary-color: #1890ff;
    --primary-hover-color: #40a9ff;
    --danger-color: #ff4d4f;
    --danger-hover-color: #ff7875;
    --success-color: #52c41a;
    --disabled-color: #f5f5f5;
    --disabled-text-color: #bfbfbf;

    /* Game Colors */
    --ground-color: #dfe3e6;
    --grid-line-color: #dadee1;
    --unexplored-color: #0b0b0b;
    --wall-color: #495360;
    --player-color: #007bff;
    --ghost-color: #dc3545;
    --end-point-color: #28a745;
    --key-color: #ffc107;
    --start-room-highlight: rgba(173, 216, 230, 0.4);
    --hover-highlight-color: #ffc107;
    --player-layer-color: #ffc107;

    /* 新增：自由编辑模式相关颜色 */
    --start-point-color: #00c9a7;
    --void-grid-color: #ccc;
}

/* ===========================
系统深色模式自动适配
（仅在用户未手动切换时生效）
=========================== */
@media (prefers-color-scheme: dark) {
    :root:not(.light):not(.dark) {
        color-scheme: dark;
        --bg-color: #1e1e1e;
        --danger-bg-color: #4b0c0c;
        --container-bg: #2c2c2c;
        --text-color: #e6e6e6;
        --border-color: #444;
        --primary-color: #177ddc;
        --primary-hover-color: #3c9ae8;
        --danger-color: #ff6b6d;
        --danger-hover-color: #ff8a8d;
        --success-color: #52c41a;
        --disabled-color: #3a3a3a;
        --disabled-text-color: #777;

        --ground-color: #2b2b2b;
        --grid-line-color: #3a3a3a;
        --unexplored-color: #000;
        --wall-color: #666;
        --player-color: #3c9ae8;
        --ghost-color: #d9534f;
        --end-point-color: #3fbf5a;
        --key-color: #e6c34a;
        
        /* 新增 */
        --start-point-color: #00c9a7;
        --void-grid-color: #444;
    }
}

/* ===========================
用户强制深色模式覆盖系统设置
=========================== */
:root.dark {
    color-scheme: dark;

    --bg-color: #1e1e1e;
    --container-bg: #2c2c2c;
    --text-color: #e6e6e6;
    --border-color: #444;

    --primary-color: #177ddc;
    --primary-hover-color: #3c9ae8;

    --danger-color: #ff6b6d;
    --danger-hover-color: #ff8a8d;
    --danger-bg-color: #4b0c0c;

    --success-color: #52c41a;

    --disabled-color: #3a3a3a;
    --disabled-text-color: #777;

    --ground-color: #2b2b2b;
    --grid-line-color: #3a3a3a;
    --unexplored-color: #000;
    --wall-color: #666;
    --player-color: #3c9ae8;
    --ghost-color: #d9534f;
    --end-point-color: #3fbf5a;
    --key-color: #e6c34a;
    
    /* 新增 */
    --start-point-color: #00c9a7;
    --void-grid-color: #444;
}

/* ===========================
用户强制浅色模式覆盖系统设置
=========================== */
:root.light {
    color-scheme: light;
}

/* ... 现有的 .theme-toggle 样式上方或下方 ... */

/* 新增：右上角操作区容器 */
.header-controls {
    position: absolute;
    top: 8px;
    right: 8px;
    display: flex;
    gap: 10px; /* 按钮之间的间距 */
    align-items: center;
    z-index: 10;
}

/* 重写：重置原有的主题开关定位，让它服从 Flex 布局 */
.header-controls .theme-toggle {
    position: relative;
    top: auto;
    right: auto;
    margin: 0;
}

/* 新增：帮助按钮样式（复用主题按钮的风格） */
.help-btn, .home-btn {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background-color: var(--border-color); /* 与主题按钮背景一致 */
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none; /* 去除链接下划线 */
    transition: background 0.25s;
    cursor: pointer; /* 新增：确保 div 也有手型光标 */
}

.help-btn:hover, .home-btn:hover {
    background-color: #c0c0c0; /* 简单的悬停效果，适配浅色 */
}
/* 深色模式下的悬停微调 */
@media (prefers-color-scheme: dark) {
     .help-btn:hover, .home-btn:hover { background-color: #555; }
}
:root.dark .help-btn:hover, :root.dark .home-btn:hover { background-color: #555; }

.help-btn svg, .home-btn svg {
    width: 18px;
    height: 18px;
    fill: var(--text-color);
    stroke: var(--text-color);
}

.theme-toggle {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 28px;
    height: 28px;
    cursor: pointer;
}

.theme-toggle-btn {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background-color: var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.25s;
}

.theme-toggle-btn svg {
    width: 18px;
    height: 18px;
    fill: var(--text-color);
    stroke: var(--text-color);
    transition: transform 0.4s ease;
}

.theme-toggle-btn.active svg {
    transform: rotate(180deg);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol', 'Noto Color Emoji';
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    margin: 0;
    padding: 20px;
    min-height: 100vh;
    box-sizing: border-box;
    transition: background-color 0.25s ease; /* Faster transition */
}

body.danger-bg {
    background-color: var(--danger-bg-color);
}

.main-container {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

#game-canvas {
    border: none; /* 默认无边框，由JS控制 */
    /* 背景设为透明，以便在虚空区域显示body背景（如红色警示） */
    background-color: transparent; 
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}

.controls-panel {
    width: 280px;
    padding:15px;
    background-color: var(--container-bg);
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
    border: 1px solid var(--border-color);
    padding: 10px;
    border-radius: 6px;
    position: relative;
}

.control-group h3 {
    margin: 0;
    font-size: 16px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
}

.control-group .status-bar {
    display: flex;
    justify-content: space-between;
    gap: 10px;
}

.control-group label, .control-group .label {
    font-weight: 500;
    font-size: 14px;
}

#ghost-proximity-display.warning {
    color: var(--danger-color);
    font-weight: bold;
}

.control-group input[type="number"], .control-group input[type="text"] {
    width: 100%;
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    box-sizing: border-box;
}

button, .button {
    padding: 10px 15px;
    border: none;
    border-radius: 4px;
    background-color: var(--primary-color);
    color: white;
    font-size: 14px;
    cursor: pointer;
    transition: background-color 0.2s;
    text-align: center;
}

button:hover, .button:hover {
    background-color: var(--primary-hover-color);
}

button.secondary {
    background-color: #6c757d;
}
button.secondary:hover {
    background-color: #5a6268;
}

button.danger {
    background-color: var(--danger-color);
}
button.danger:hover {
    background-color: var(--danger-hover-color);
}

button:disabled {
    background-color: var(--disabled-color);
    color: var(--disabled-text-color);
    cursor: not-allowed;
}

.toggle-switch {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.toggle-switch input[type="checkbox"] {
    height: 0;
    width: 0;
    visibility: hidden;
}

.toggle-switch label {
    cursor: pointer;
    text-indent: -9999px;
    width: 50px;
    height: 25px;
    background: grey;
    display: block;
    border-radius: 100px;
    position: relative;
}

.toggle-switch label:after {
    content: '';
    position: absolute;
    top: 2.5px;
    left: 2.5px;
    width: 20px;
    height: 20px;
    background: #fff;
    border-radius: 90px;
    transition: 0.3s;
}

.toggle-switch input:checked + label {
    background: var(--primary-color);
}

.toggle-switch input:checked + label:after {
    left: calc(100% - 2.5px);
    transform: translateX(-100%);
}

.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    display: none; /* Initially hidden */
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.overlay-content {
    background-color: var(--container-bg);
    padding: 30px 40px;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
}

.overlay-content h2, .overlay-content p {
    margin-top: 0;
    margin-bottom: 1em;
}

.overlay-content .buttons {
    margin-top: 20px;
    display: flex;
    gap: 10px;
    justify-content: center;
}

.editor-toolbar {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    /* 微调：左对齐以便新按钮排版 */
    justify-content: flex-start;
}

.share-buttons-container {
    display: flex;
    gap: 10px;
}
.share-buttons-container button {
    flex: 1; /* 让两个按钮平分宽度 */
}

.editor-toolbar button.active {
    background-color: var(--primary-hover-color);
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.2);
}

/* 编辑器工具图标按钮样式 */
.editor-toolbar .icon-btn {
    width: 36px;
    height: 36px;
    padding: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: transparent;
    border: 1px solid var(--wall-color);
    border-radius: 4px;
}

.editor-toolbar .icon-btn:hover {
    background-color: rgba(128, 128, 128, 0.2);
}

.editor-toolbar .icon-btn.active {
    background-color: rgba(128, 128, 128, 0.4);
    border-color: var(--primary-color);
}

.editor-toolbar .icon-btn svg {
    width: 24px;
    height: 24px;
}

/* === Toast Notification Styles === */
.toast {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translate(-50%, -100px);
    padding: 12px 20px;
    border-radius: 6px;
    background-color: var(--primary-color);
    color: white;
    font-size: 15px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: transform 0.4s ease, opacity 0.4s ease, visibility 0.4s;
}
.toast.show {
    transform: translate(-50%, 0);
    opacity: 1;
    visibility: visible;
}
.toast.success {
    background-color: var(--success-color);
}
.toast.error {
    background-color: var(--danger-color);
}
/* === 新增：用于将标签和输入框放在一行的样式 === */
.inline-control-group {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px; /* 在标签和输入框之间增加一点间距 */
}
/* === 新增：限制行内输入框的宽度，使其不再占满剩余空间 === */
.inline-control-group input[type="number"] {
    width: 50%; /* 设置输入框宽度为父容器的一半 */
}
#game-canvas {
 -webkit-tap-highlight-color: transparent; /* 核心改动：移除移动端点击时的蓝色高亮效果 */
}

/* === 新增：模式选择器样式 === */
.mode-selector {
    display: flex;
    width: 100%;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}
.mode-btn {
    flex: 1;
    padding: 8px;
    border: none;
    background-color: var(--container-bg);
    color: var(--text-color);
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s;
    border-radius: 0;
}
.mode-btn:not(:last-child) {
    border-right: 1px solid var(--border-color);
}
.mode-btn.active {
    background-color: var(--primary-color);
    color: white;
    font-weight: bold;
}
.mode-btn:not(.active):hover {
    background-color: #f0f0f0;
}

/* === 移动端适配媒体查询 === */
/* 当屏幕宽度小于等于 768px 时，应用以下样式 */
@media (max-width: 768px) {
    body {
        padding: 10px; /* 为小屏幕调整内边距，避免内容紧贴边缘 */
        align-items: flex-start; /* 恢复默认的顶部对齐 */
    }

    .main-container {
        flex-direction: column; /* 核心改动：将主容器的布局从水平并排变为垂直堆叠 */
        gap: 15px; /* 调整画布和控制面板垂直堆叠时的间距 */
        width: 100%;
    }

    #game-canvas {
        width: 100%; /* 让画布宽度占满容器宽度 */
        height: auto; /* 高度自动调整，以保持其原始的1:1宽高比 */
        order: 1; /* 视觉上确保画布在控制面板的上方 */
    }

    .controls-panel {
        width: 100%; /* 控制面板也占满容器宽度 */
        order: 2; /* 视觉上确保控制面板在画布的下方 */
        padding: 15px; /* 可以在小屏幕上稍微减少一点内边距 */
        box-sizing: border-box; /* 确保padding不会撑大宽度 */
    }

    /* 调整游戏结束、胜利等浮窗在小屏幕上的表现 */
    .overlay-content {
        padding: 20px 15px;
        width: 90%; /* 避免浮窗宽度紧贴屏幕边缘 */
        box-sizing: border-box;
    }

    .overlay-content h2 {
        font-size: 1.5rem; /* 适当调整标题字体大小 */
    }

    /* 在小屏幕上，浮窗里的按钮也垂直堆叠，更易于点击 */
    .overlay-content .buttons {
        flex-direction: column;
        gap: 10px;
    }
    
    .overlay-content .buttons button {
        width: 100%; /* 让每个按钮都更容易点击 */
    }
    
    /* 调整编辑器工具栏，允许其在空间不足时换行并居中 */
    .editor-toolbar {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    #dpad-controls {
        display: grid !important;
        grid-template-columns: 60px 60px 60px;
        grid-template-rows: 60px 60px 60px;
        position: fixed;
        bottom: 20px;
        right: 20px;
        opacity: 0.7;
        z-index: 100;
        background-color: transparent;
        touch-action: none;
        transform-origin: center center;
    }

    .dpad-btn {
        background-color: #333;
        color: white;
        border: 2px solid #555;
        border-radius: 10px;
        font-size: 24px;
        display: flex;
        justify-content: center;
        align-items: center;
        user-select: none;
        -webkit-user-select: none;
        cursor: pointer;
    }

    #dpad-up { grid-column: 2; grid-row: 1; }
    #dpad-down { grid-column: 2; grid-row: 3; }
    #dpad-left { grid-column: 1; grid-row: 2; }
    #dpad-right { grid-column: 3; grid-row: 2; }
    
    /* Fix 8: 中键样式 - 与空格键绑定 */
    #dpad-center {
        grid-column: 2;
        grid-row: 2;
        background-color: rgba(85, 85, 85, 0.9);
        border-radius: 50%;
        font-size: 18px;
    }

    .dpad-btn:active {
        background-color: #555;
        transform: scale(0.95);
    }
}

/* 1. 开关父容器的基础布局 */
.toggle-controls-wrapper {
display: flex;
align-items: center;
gap: 15px; /* 仅在移动端两个开关并存时生效 */
/* 默认靠左对齐，适用于电脑端只有一个开关的情况 */
justify-content: flex-start; 
}

/* 2. 每个开关的基础样式 */
.toggle-controls-wrapper .toggle-switch {
display: flex;
align-items: center;
justify-content: space-between;
width: 100%; /* 默认让开关占满父容器宽度 */
}

/* 3. 默认隐藏方向键开关 */
#dpad-toggle-container {
display: none;
}

/* 4. 仅在移动端 (屏幕宽度 <= 768px) 应用特殊布局 */
@media (max-width: 768px) {
/* 在移动端，让父容器的对齐方式变为 space-between */
.toggle-controls-wrapper {
    justify-content: space-between;
}

/* 在移动端，让每个开关只占大约一半的宽度 */
.toggle-controls-wrapper .toggle-switch {
    width: 48%;
}

/* 在移动端，显示方向键开关 */
#dpad-toggle-container {
    display: flex;
}
}

/* 用于通过JS来强制隐藏方向键的类 */
#dpad-controls.hidden {
display: none !important;
}

/* ===========================
   图层切换面板样式
   =========================== */
/* Fix 1: Canvas wrapper to position layer panel to the RIGHT of canvas (outside, not covering) */
.canvas-wrapper {
    position: relative;
    display: inline-flex;
    align-items: center;
}

.layer-panel {
    /* 固定在画布右侧，垂直居中（对宽 / 窄屏均生效） */
    position: absolute;
    /* 向左微调，避免遮挡（原为 calc(100% + 10px)） */
    left: calc(100% - 12px);
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 6px;
    background-color: var(--container-bg);
    border-radius: 8px;
    box-shadow: 0 6px 14px rgba(0,0,0,0.16);
    z-index: 60;
    min-width: 44px;
}

#layer-buttons-container {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.layer-btn {

    width: 44px;
    height: 44px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--container-bg);
    color: var(--text-color);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.12s ease, box-shadow 0.12s ease, background-color 0.12s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 1px 2px rgba(0,0,0,0.04);
}

.layer-btn:hover {
    /* 与编辑器工具的高亮效果一致：主色悬停 + 内凹阴影 */
    background-color: var(--primary-hover-color);
    color: white;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.12);
    transform: none;
}

.layer-btn.active {
    background-color: var(--primary-color);
    color: white;
    border-color: rgba(0,0,0,0.06);
}

.layer-btn.player-layer {
    border-color: var(--player-layer-color);
    border-width: 2px;
    border-style: solid;
    /* 稍微加宽黄色高亮：更明显的外扩阴影与更高不透明度 */
    box-shadow: 0 0 0 5px rgba(255,193,7,0.12);
}

#layer-edit-controls {
    display: flex;
    flex-direction: column;
    gap: 5px;
    margin-top: 8px;
    border-top: 1px solid var(--border-color);
    padding-top: 8px;
}

.layer-control-btn {
    width: 40px;
    height: 32px;
    border: none;
    border-radius: 4px;
    background-color: var(--primary-color);
    color: white;
    font-size: 18px;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
}

.layer-control-btn:hover {
    background-color: var(--primary-hover-color);
}

.layer-control-btn:disabled {
    background-color: var(--disabled-color);
    color: var(--disabled-text-color);
    cursor: not-allowed;
}