/* ========== CSS 变量定义 ========== */
:root {
	/* 亮色主题变量 */
	--flf-bg-color: #fefefe;
	--flf-text-color: #333;
	--flf-border-color: #888;
	--flf-input-bg: #fff;
	--flf-input-border: #ccc;
	--flf-modal-overlay: rgba(0, 0, 0, 0.4);
	--flf-box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
	--flf-close-color: #aaa;
	--flf-close-hover: #000;
	
	/* 按钮颜色 */
	--flf-close-btn-bg: #f44336;
	--flf-close-btn-hover: #d32f2f;
	--flf-confirm-btn-bg: #007bff;
	--flf-confirm-btn-hover: #0056b3;
	--flf-open-btn-bg: #5e72e4;
	--flf-open-btn-hover: #4b5cc4;
}

/* 暗黑模式变量覆盖 */
body.dark-mode {
	--flf-bg-color: #333;
	--flf-text-color: #e0e0e0;
	--flf-border-color: #555;
	--flf-input-bg: #444;
	--flf-input-border: #666;
	--flf-modal-overlay: rgba(0, 0, 0, 0.8);
	--flf-box-shadow: 0 4px 8px rgba(0, 0, 0, 0.5);
	--flf-close-color: #ccc;
	--flf-close-hover: #fff;
}

/* ========== 基础样式重置 ========== */
.flf-form-container *, 
.flf-form-container *::before, 
.flf-form-container *::after {
	box-sizing: border-box;
}

/* ========== 通用样式 ========== */
.flf-form-container {
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
	text-align: center;
}

/* 模态框容器 */
.flf-modal {
	display: none;
	position: fixed;
	z-index: 1000;
	left: 0;
	top: 0;
	width: 100%;
	height: 100%;
	overflow: auto;
	background-color: var(--flf-modal-overlay);
	/* 硬件加速优化 */
	transform: translateZ(0);
	backface-visibility: hidden;
}

/* 模态框内容 */
.flf-modal-content {
	background-color: var(--flf-bg-color);
	color: var(--flf-text-color);
	margin: 10vh auto;
	padding: 20px;
	border: 1px solid var(--flf-border-color);
	width: calc(100% - 40px);
	max-width: 500px;
	border-radius: 15px;
	box-shadow: var(--flf-box-shadow);
	/* 硬件加速优化 */
	transform: translateZ(0);
	backface-visibility: hidden;
}

/* 关闭按钮 */
.flf-close {
	color: var(--flf-close-color);
	float: right;
	font-size: 28px;
	font-weight: bold;
	cursor: pointer;
	transition: color 0.2s ease;
}
.flf-close:hover,
.flf-close:focus {
	color: var(--flf-close-hover);
	text-decoration: none;
}

/* 表单标题 */
.flf-modal-content h2 {
	margin-top: 0;
	color: var(--flf-text-color);
}

/* 输入框/文本域 */
.flf-modal-content input,
.flf-modal-content textarea {
	width: 100%;
	padding: 12px;
	margin: 8px 0;
	display: block;
	border: 1px solid var(--flf-input-border);
	border-radius: 4px;
	background-color: var(--flf-input-bg);
	color: var(--flf-text-color);
	transition: border-color 0.3s ease;
}
.flf-modal-content textarea {
	min-height: 100px;
	resize: vertical;
}

/* 按钮容器 */
.flf-buttons {
	display: flex;
	justify-content: flex-end;
	gap: 10px;
	margin-top: 15px;
}

/* 按钮通用样式 */
.flf-close-btn,
.flf-confirm-btn,
.flf-open-btn {
	padding: 10px 15px;
	border: none;
	border-radius: 15px;
	cursor: pointer;
	font-size: 14px;
	font-weight: 500;
	color: white;
	transition: all 0.2s ease;
	/* 硬件加速优化 */
	transform: translateZ(0);
	backface-visibility: hidden;
}

/* 关闭按钮样式 */
.flf-close-btn {
	background-color: var(--flf-close-btn-bg);
}
.flf-close-btn:hover {
	background-color: var(--flf-close-btn-hover);
	transform: translateY(-1px);
	box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* 确认按钮样式 */
.flf-confirm-btn {
	background-color: var(--flf-confirm-btn-bg);
}
.flf-confirm-btn:hover {
	background-color: var(--flf-confirm-btn-hover);
	transform: translateY(-1px);
	box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}
/* 提交中状态 */
.flf-confirm-btn.loading {
	opacity: 0.8;
	cursor: not-allowed;
}

/* 打开表单按钮 */
.flf-open-btn {
	background-color: var(--flf-open-btn-bg);
	padding: 12px 20px;
	font-size: 16px;
	display: inline-block;
}
.flf-open-btn:hover {
	background-color: var(--flf-open-btn-hover);
	transform: translateY(-1px);
	box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

/* ========== 响应式设计优化 ========== */
@media (max-width: 600px) {
	.flf-modal-content {
		margin: 5vh auto;
		padding: 15px;
	}
	
	.flf-buttons {
		flex-direction: column;
	}
	
	.flf-close-btn,
	.flf-confirm-btn {
		width: 100%;
	}
	
	.flf-open-btn {
		padding: 10px 16px;
		font-size: 14px;
	}
}

/* ========== 可访问性增强 ========== */
@media (prefers-reduced-motion: reduce) {
	.flf-close,
	.flf-close-btn,
	.flf-confirm-btn,
	.flf-open-btn {
		transition: none;
	}
	
	.flf-close-btn:hover,
	.flf-confirm-btn:hover,
	.flf-open-btn:hover {
		transform: none;
	}
}