:root {
    --bg-color: #2b2b2b;
    --panel-color: #3c3f41;
    --item-active: #4a4d4f;
    --text-color: #dcdcdc;
    --accent-color: #4a90e2;
    --border-color: #111;
}

body {
    font-family: 'Segoe UI', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    display: flex;
    flex-direction: column;
    height: 100vh; /* 兼容旧浏览器 */
    height: 100dvh; /* 核心：适配移动端动态视口，减去地址栏高度 */
    overflow: hidden;
    user-select: none;
    overflow-y: hidden;
    /* iOS 强力全屏修正 */
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
}

/* --- Header --- */
header {
    background-color: var(--panel-color);
    padding: 8px 15px;
    padding-top: max(8px, env(safe-area-inset-top)); /* 适配刘海屏安全区域 */
    display: flex;
    align-items: center;
    justify-content: flex-start;
    border-bottom: 1px solid var(--border-color);
    height: 30px;
    box-sizing: content-box; /* 确保 padding 不影响高度计算 */
}

/* --- Menu Bar --- */

 .menu-bar {
    background-color: var(--panel-color);
    display: flex;
    flex-wrap: wrap; 
    border-bottom: 1px solid var(--border-color);
    font-size: 13px;
    touch-action: manipulation;
    position: relative;
    z-index: 9999; 
    overflow: visible;
}

/* 移动端适配：缩小字体和间距，尽量在一行显示 */
@media (max-width: 600px) {
    .menu-bar {
        font-size: 11px;
    }
    .menu-title {
        padding: 6px 8px; /* 减小左右内边距 */
    }
}

.menu-item {
    position: relative;
    z-index: 1;
}

.menu-title {
    display: block;
    padding: 6px 12px;
    cursor: pointer;
    touch-action: manipulation;
}

.menu-title:hover {
    background-color: var(--item-active);
}

.menu-item.active .menu-title {
    background-color: var(--item-active);
}

.menu-dropdown {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--panel-color);
    border: 1px solid var(--border-color);
    min-width: 180px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.3);
    z-index: 10000;
}

.menu-item.active .menu-dropdown {
    display: block;
}

.menu-option {
    padding: 8px 16px;
    cursor: pointer;
    touch-action: manipulation;
    background-color: var(--panel-color);
}

.menu-option:hover {
    background-color: var(--accent-color);
}

.menu-divider {
    height: 1px;
    background-color: var(--border-color);
    margin: 4px 0;
}

/* --- Tool Options Bar --- */
.tool-options-bar {
    background-color: var(--panel-color);
    border-bottom: 1px solid var(--border-color);
    padding: 8px 15px;
    font-size: 12px;
    min-height: 32px;
    display: flex;
    align-items: center;
}

.tool-options {
    display: flex;
    align-items: center;
    gap: 10px;
}

.tool-options label {
    color: var(--text-color);
    margin: 0;
}

.tool-options select {
    background-color: var(--bg-color);
    color: var(--text-color);
    border: 1px solid #555;
    border-radius: 3px;
    padding: 4px 8px;
    font-size: 12px;
    cursor: pointer;
}

.tool-options select:focus {
    outline: none;
    border-color: var(--accent-color);
}

.tool-options input[type="checkbox"] {
    cursor: pointer;
    margin-right: 5px;
}

.tool-options input[type="range"] {
    width: 100px;
    cursor: pointer;
}

.tool-options span {
    color: var(--text-color);
    min-width: 30px;
}

.toolbar-top { display: flex; gap: 10px; }

button, .file-btn {
    background-color: #555;
    border: 1px solid #222;
    color: white;
    padding: 4px 12px;
    cursor: pointer;
    border-radius: 3px;
    font-size: 12px;
}
button:hover, .file-btn:hover { background-color: #666; }
button:disabled { opacity: 0.5; cursor: not-allowed; }
input[type="file"] { display: none; }

/* --- Main Layout --- */
.main-container {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* --- Left: Tools --- */
.tools-panel {
    width: 50px;
    background-color: var(--panel-color);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-top: 10px;
    gap: 8px;
}

.tool-btn {
    width: 36px;
    height: 36px;
    font-size: 18px;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    background: transparent;
    border: 1px solid transparent;
}
.tool-btn.active {
    background-color: #215aa8;
    border-color: var(--accent-color);
    box-shadow: inset 0 0 8px rgba(74, 144, 226, 0.4), 0 0 4px rgba(74, 144, 226, 0.3);
}

input[type="color"] {
    width: 36px;
    height: 36px;
    border: none;
    padding: 0;
    background: none;
    cursor: pointer;
}

.tool-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 4px;
}

.tool-option input[type="range"] {
    cursor: pointer;
}

/* --- Center: Workspace --- */
.workspace {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: auto;
    background-color: #1e1e1e;
    position: relative;
    touch-action: none;
}

.canvas-container {
    position: relative;
    background-image:
        linear-gradient(45deg, #ccc 25%, transparent 25%),
        linear-gradient(-45deg, #ccc 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #ccc 75%),
        linear-gradient(-45deg, transparent 75%, #ccc 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    background-color: #fff;
    box-shadow: 0 0 20px rgba(0,0,0,0.5);
}

canvas {
    display: block;
    image-rendering: pixelated;
}

canvas.cursor-none {
    cursor: none;
}

canvas.cursor-crosshair {
    cursor: crosshair;
}

canvas.cursor-move {
    cursor: move;
}

canvas.cursor-picker {
    cursor: crosshair;
}

/* --- Right: Layers --- */
.layers-panel {
    width: 200px;
    background-color: var(--panel-color);
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.panel-header {
    padding: 8px;
    background: #333;
    font-size: 12px;
    font-weight: bold;
    border-bottom: 1px solid var(--border-color);
}

.layer-list {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.layer-item {
    display: flex;
    align-items: center;
    padding: 8px;
    border-bottom: 1px solid #444;
    cursor: pointer;
    background-color: var(--panel-color);
    position: relative;
}

.layer-item:hover { background-color: #454545; }
.layer-item.active { background-color: #215aa8; }

.layer-item.dragging {
    opacity: 0.5;
}

.layer-item.drop-above::before {
    content: '';
    position: absolute;
    top: -2px;
    left: 0;
    right: 0;
    height: 3px;
    background-color: var(--accent-color);
    z-index: 10;
}

.layer-item.drop-below::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 3px;
    background-color: var(--accent-color);
    z-index: 10;
}

.layer-item.drop-into {
    background-color: rgba(74, 144, 226, 0.3);
    box-shadow: inset 0 0 0 2px var(--accent-color);
}

.layer-vis {
    width: 20px;
    text-align: center;
    cursor: pointer;
    margin-right: 5px;
    color: #aaa;
}
.layer-vis.hidden { color: #555; }

.layer-thumb {
    width: 24px;
    height: 24px;
    background: white;
    margin-right: 8px;
    border: 1px solid #000;
    image-rendering: pixelated;
    display: block;
}

.layer-name {
    font-size: 12px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex: 1;
}

.layer-arrow {
    width: 16px;
    text-align: center;
    cursor: pointer;
    margin-right: 4px;
    font-size: 10px;
    user-select: none;
}

.layer-folder-icon {
    margin-right: 6px;
    font-size: 14px;
}

.layer-controls {
    padding: 8px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-around;
}

.status-bar {
    background: var(--panel-color);
    border-top: 1px solid var(--border-color);
    padding: 2px 10px;
    font-size: 11px;
    color: #888;
    display: flex;
    justify-content: space-between;
}

/* --- Custom Dialog --- */
.dialog-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10000;
}

.dialog-box {
    background-color: var(--panel-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    min-width: 300px;
    padding: 20px;
}

.dialog-title {
    font-size: 14px;
    font-weight: bold;
    color: var(--text-color);
    margin-bottom: 15px;
}

.dialog-input {
    width: 100%;
    padding: 8px;
    background-color: var(--bg-color);
    border: 1px solid #555;
    border-radius: 3px;
    color: var(--text-color);
    font-size: 13px;
    box-sizing: border-box;
    margin-bottom: 15px;
}

.dialog-input:focus {
    outline: none;
    border-color: var(--accent-color);
}

.dialog-buttons {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

.dialog-btn {
    padding: 6px 16px;
    border-radius: 3px;
    border: none;
    cursor: pointer;
    font-size: 12px;
    transition: background-color 0.2s;
}

.dialog-btn-ok {
    background-color: var(--accent-color);
    color: white;
}

.dialog-btn-ok:hover {
    background-color: #5a9ef2;
}

.dialog-btn-cancel {
    background-color: #555;
    color: var(--text-color);
}

.dialog-btn-cancel:hover {
    background-color: #666;
}

/* --- Context Menu --- */
.context-menu {
    position: fixed;
    background-color: var(--panel-color);
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    z-index: 10000;
    min-width: 150px;
    padding: 4px 0;
    font-size: 12px;
}

.context-menu-item {
    padding: 6px 16px;
    cursor: pointer;
    color: var(--text-color);
}

.context-menu-item:hover {
    background-color: var(--accent-color);
}

.context-menu-item.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.context-menu-item.disabled:hover {
    background-color: transparent;
}

.context-menu-divider {
    height: 1px;
    background-color: var(--border-color);
    margin: 4px 0;
}

/* --- Toast Notifications --- */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 10001;
    display: flex;
    flex-direction: column;
    gap: 10px;
    pointer-events: none;
}

.toast {
    background-color: var(--panel-color);
    color: var(--text-color);
    padding: 12px 20px;
    border-radius: 4px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
    font-size: 13px;
    min-width: 200px;
    max-width: 400px;
    opacity: 0;
    transform: translateX(400px);
    transition: all 0.3s ease;
    border-left: 4px solid;
}

.toast-show {
    opacity: 1;
    transform: translateX(0);
}

.toast-info {
    border-left-color: var(--accent-color);
}

.toast-success {
    border-left-color: #4caf50;
}

.toast-warning {
    border-left-color: #ff9800;
}

.toast-error {
    border-left-color: #f44336;
}

/* Mobile toast (Android style) */
.toast-mobile {
    top: auto;
    bottom: 80px;
    left: 50%;
    right: auto;
    transform: translateX(-50%);
    align-items: center;
}

.toast-mobile .toast {
    transform: translateY(100px);
    border-left: none;
    border-radius: 24px;
    max-width: 90vw;
    background-color: rgba(0, 0, 0, 0.85);
}

.toast-mobile .toast-show {
    transform: translateY(0);
}

/* --- Mobile Adaptations --- */
@media (max-width: 768px) {
    .main-container {
    display: flex;
    flex: 1;
    overflow: hidden;
    max-height: 80vh;
    }
    header {
        padding: 6px 10px;
        height: 24px;
        font-size: 11px;
    }

    /* .menu-bar {
        font-size: 11px;
        overflow-x: auto;
        white-space: nowrap;
        -webkit-overflow-scrolling: touch; /* iOS 滚动优化 */
    } */

    .menu-title {
        padding: 10px 12px; /* 增加触摸目标大小 */
        min-height: 36px; /* 确保触摸目标足够大 */
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .tool-options-bar {
        padding: 6px 10px;
        font-size: 11px;
        flex-wrap: wrap;
    }

    .tools-panel {
        width: 40px;
        padding-top: 5px;
        gap: 5px;
    }

    .tool-btn {
        width: 32px;
        height: 32px;
        font-size: 16px;
    }

    input[type="color"] {
        width: 32px;
        height: 32px;
    }

    .layers-panel {
        width: 150px;
    }

    .layer-item {
        padding: 6px;
    }

    .layer-thumb {
        width: 20px;
        height: 20px;
    }

    .layer-name {
        font-size: 11px;
    }

    .status-bar {
        font-size: 10px;
        padding: 2px 5px;
        flex-wrap: wrap;
    }

    .toast-container:not(.toast-mobile) {
        top: 10px;
        right: 10px;
    }

    .toast-container:not(.toast-mobile) .toast {
        min-width: auto;
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    .main-container {
        position: relative;
    }

    .layers-panel {
        position: absolute;
        right: 0;
        top: 0;
        bottom: 0;
        z-index: 100;
        transform: translateX(100%);
        transition: transform 0.3s;
    }

    .layers-panel.mobile-show {
        transform: translateX(0);
    }

    .tool-options input[type="range"] {
        width: 80px;
    }
}

/* --- Custom Panels Container --- */
.custom-panels-container {
    min-width: 200px;
    max-width: 500px;
    width: auto;
    background-color: var(--panel-color);
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    overflow-x: hidden;
    gap: 8px;
    padding: 8px;
    resize: horizontal;
    min-height: 0;
    height: 100%;
}

.custom-panel {
    background-color: var(--panel-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    display: flex;
    flex-direction: column;
}

.custom-panel.dragging {
    opacity: 0.5;
}

.custom-panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px;
    background: #333;
    border-bottom: 1px solid var(--border-color);
    cursor: move;
    user-select: none;
}

.custom-panel-title {
    font-size: 12px;
    font-weight: bold;
    flex: 1;
}

.custom-panel-close {
    background: transparent;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    padding: 2px 6px;
    font-size: 14px;
    border-radius: 2px;
}

.custom-panel-close:hover {
    background-color: #e74c3c;
    color: white;
}

.custom-panel-content {
    padding: 8px;
    overflow-y: auto;
    overflow-x: auto;
    flex: 1;
    min-height: 50px;
}