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

html, body {
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: #f5f5f5;
    overflow: hidden;
    -webkit-user-select: none;
    user-select: none;
}

.app {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* 顶部工具栏 */
.toolbar {
    display: flex;
    justify-content: center;
    gap: 16px;
    padding: 12px 16px;
    background: #fff;
    border-bottom: 1px solid #e0e0e0;
    flex-shrink: 0;
}

.btn {
    padding: 10px 24px;
    font-size: 15px;
    border: 1px solid #ddd;
    border-radius: 6px;
    background: #fff;
    color: #333;
    cursor: pointer;
    transition: all 0.2s;
}

.btn:active {
    background: #f0f0f0;
}

.btn-primary {
    background: #4a90e2;
    color: #fff;
    border-color: #4a90e2;
}

.btn-primary:active {
    background: #3a7bc8;
}

/* 图片展示区 */
.canvas-area {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
    overflow: auto;
    position: relative;
}

.empty-tip {
    color: #999;
    font-size: 14px;
}

.image-container {
    display: none;
    position: relative;
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}

.image-container.show {
    display: block;
}

#bgImage {
    display: block;
    max-width: 100%;
    max-height: calc(100vh - 200px);
    object-fit: contain;
    -webkit-user-drag: none;
}

/* 文字输入框 */
.text-input {
    position: absolute;
    min-width: 80px;
    min-height: 32px;
    padding: 4px 8px;
    font-size: 18px;
    color: #333;
    background: rgba(255,255,255,0.9);
    border: 2px solid transparent;
    border-radius: 4px;
    outline: none;
    cursor: grab;
    white-space: nowrap;
    line-height: 1.4;
    -webkit-user-select: none;
    user-select: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

/* 选中状态（单击） */
.text-input.selected {
    border-color: #4a90e2;
    box-shadow: 0 0 0 2px rgba(74,144,226,0.3);
    cursor: grab;
}

/* 编辑状态（双击） */
.text-input.editing {
    border-color: #4a90e2;
    background: rgba(255,255,255,0.95);
    cursor: text;
    -webkit-user-select: text;
    user-select: text;
}

/* 拖拽状态 */
.text-input.dragging {
    opacity: 0.8;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    cursor: grabbing;
}

/* 隐藏空提示 */
.empty-tip.hidden {
    display: none;
}

/* 手机端输入控制区 */
.mobile-input-controls {
    display: none;
    padding: 12px 16px;
    background: #fff;
    border-top: 1px solid #e0e0e0;
    gap: 12px;
    flex-shrink: 0;
}

.mobile-input-controls.show {
    display: flex;
}

.input-control-group {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.input-control-group label {
    font-size: 12px;
    color: #666;
}

.input-control-group input {
    padding: 10px 12px;
    font-size: 15px;
    border: 1px solid #ddd;
    border-radius: 6px;
    outline: none;
    -webkit-user-select: text;
    user-select: text;
}

.input-control-group input:focus {
    border-color: #4a90e2;
}

/* 长按提示 */
.long-press-tip {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    padding: 8px 16px;
    background: rgba(0,0,0,0.7);
    color: #fff;
    font-size: 12px;
    border-radius: 16px;
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
    z-index: 1000;
}

.long-press-tip.show {
    opacity: 1;
}

/* 右键菜单 */
.context-menu {
    position: fixed;
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 6px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    padding: 4px 0;
    z-index: 1000;
    min-width: 120px;
}

.context-menu-item {
    padding: 10px 16px;
    font-size: 14px;
    color: #333;
    cursor: pointer;
    transition: background 0.2s;
}

.context-menu-item:hover {
    background: #f5f5f5;
}

.context-menu-item:active {
    background: #e8e8e8;
}

/* 移动端适配 */
@media (max-width: 768px) {
    .mobile-input-controls {
        display: flex;
    }
    
    #bgImage {
        max-height: calc(100vh - 280px);
    }
}