/**
 * Playbook Course Cards — 战术手册卡片展示样式
 * 
 * 设计理念：
 * - 参考 Program 的紫色主题和分栏布局
 * - 结合 Playbook v2.0 成长渐变（蓝→紫→橙）
 * - 卡片式设计，支持 Grid 和 List 布局
 * - 进度可视化，状态指示器
 */

/* ========================================
   Variables
   ======================================== */

:root {
	/* Playbook Growth Gradient */
	--pb-card-blue: #0ea5e9;    /* 启发 */
	--pb-card-purple: #8b5cf6;  /* 深度 */
	--pb-card-amber: #f59e0b;   /* 成就 */
	
	/* Status Colors */
	--pb-status-active: #10b981;
	--pb-status-expired: #ef4444;
	--pb-status-completed: #8b5cf6;
	--pb-status-inactive: #6b7280;
	
	/* Neutrals */
	--pb-card-bg: #ffffff;
	--pb-card-border: #e5e7eb;
	--pb-card-text: #1f2937;
	--pb-card-text-light: #6b7280;
	--pb-card-hover-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

/* ========================================
   Container
   ======================================== */

.pb-course-cards {
	display: grid;
	gap: 24px;
	margin: 40px 0;
}

/* Grid Layout */
.pb-course-cards.pb-layout-grid {
	grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
}

.pb-course-cards.pb-layout-grid.pb-cols-2 {
	grid-template-columns: repeat(2, 1fr);
}

.pb-course-cards.pb-layout-grid.pb-cols-3 {
	grid-template-columns: repeat(3, 1fr);
}

.pb-course-cards.pb-layout-grid.pb-cols-4 {
	grid-template-columns: repeat(4, 1fr);
}

/* List Layout */
.pb-course-cards.pb-layout-list {
	grid-template-columns: 1fr;
	max-width: 800px;
	margin-left: auto;
	margin-right: auto;
}

/* Responsive Breakpoints */
@media (max-width: 1200px) {
	.pb-course-cards.pb-layout-grid.pb-cols-4 {
		grid-template-columns: repeat(3, 1fr);
	}
}

@media (max-width: 968px) {
	.pb-course-cards.pb-layout-grid.pb-cols-3,
	.pb-course-cards.pb-layout-grid.pb-cols-4 {
		grid-template-columns: repeat(2, 1fr);
	}
}

@media (max-width: 640px) {
	.pb-course-cards.pb-layout-grid {
		grid-template-columns: 1fr;
	}
}

/* ========================================
   Course Card
   ======================================== */

.pb-course-card {
	background: var(--pb-card-bg);
	border: 1px solid var(--pb-card-border);
	border-radius: 12px;
	overflow: hidden;
	transition: transform 0.2s ease, box-shadow 0.2s ease;
	display: flex;
	flex-direction: column;
}

.pb-course-card:hover {
	transform: translateY(-4px);
	box-shadow: var(--pb-card-hover-shadow);
}

/* ========================================
   Card Header (Gradient)
   ======================================== */

.pb-card-header {
	position: relative;
	height: 140px;
	overflow: hidden;
}

.pb-card-gradient {
	position: absolute;
	inset: 0;
	background: linear-gradient(135deg, var(--pb-card-blue) 0%, var(--pb-card-purple) 50%, var(--pb-card-amber) 100%);
	opacity: 0.9;
	transition: opacity 0.3s ease;
}

.pb-course-card:hover .pb-card-gradient {
	opacity: 1;
}

.pb-card-icon {
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
	font-size: 48px;
	filter: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.1));
	animation: pulse 3s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@keyframes pulse {
	0%, 100% {
		opacity: 1;
		transform: translate(-50%, -50%) scale(1);
	}
	50% {
		opacity: 0.8;
		transform: translate(-50%, -50%) scale(1.05);
	}
}

/* ========================================
   Card Body
   ======================================== */

.pb-card-body {
	padding: 20px;
	flex: 1;
	display: flex;
	flex-direction: column;
	gap: 16px;
}

/* Meta Information */
.pb-card-meta {
	display: flex;
	align-items: center;
	gap: 8px;
	font-size: 13px;
	font-weight: 500;
}

.pb-card-status {
	display: inline-flex;
	align-items: center;
	padding: 4px 12px;
	border-radius: 12px;
	font-size: 12px;
	font-weight: 600;
	text-transform: uppercase;
	letter-spacing: 0.5px;
}

.pb-card-status.pb-status-active {
	background: rgba(16, 185, 129, 0.1);
	color: var(--pb-status-active);
}

.pb-card-status.pb-status-expired {
	background: rgba(239, 68, 68, 0.1);
	color: var(--pb-status-expired);
}

.pb-card-status.pb-status-completed {
	background: rgba(139, 92, 246, 0.1);
	color: var(--pb-status-completed);
}

.pb-card-status.pb-status-inactive {
	background: rgba(107, 114, 128, 0.1);
	color: var(--pb-status-inactive);
}

.pb-card-expire {
	color: var(--pb-card-text-light);
	font-size: 12px;
	margin-left: auto;
}

/* Title */
.pb-card-title {
	font-size: 20px;
	font-weight: 700;
	line-height: 1.4;
	color: var(--pb-card-text);
	margin: 0;
	font-family: 'Georgia', 'Noto Serif SC', serif;
}

/* Stats */
.pb-card-stats {
	display: flex;
	gap: 24px;
}

.pb-stat {
	display: flex;
	align-items: center;
	gap: 6px;
	font-size: 14px;
}

.pb-stat-icon {
	font-size: 18px;
	opacity: 0.8;
}

.pb-stat-value {
	font-weight: 700;
	color: var(--pb-card-text);
}

.pb-stat-label {
	color: var(--pb-card-text-light);
	font-size: 12px;
}

/* Progress Bar */
.pb-card-progress {
	margin-top: auto;
}

.pb-progress-bar {
	height: 6px;
	background: #e5e7eb;
	border-radius: 3px;
	overflow: hidden;
	position: relative;
}

.pb-progress-fill {
	height: 100%;
	background: linear-gradient(90deg, var(--pb-card-blue) 0%, var(--pb-card-purple) 50%, var(--pb-card-amber) 100%);
	border-radius: 3px;
	transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
	position: relative;
}

.pb-progress-fill::after {
	content: '';
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
	background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
	animation: shimmer 2s infinite;
}

@keyframes shimmer {
	0% {
		transform: translateX(-100%);
	}
	100% {
		transform: translateX(100%);
	}
}

/* ========================================
   Card Footer
   ======================================== */

.pb-card-footer {
	padding: 16px 20px;
	border-top: 1px solid var(--pb-card-border);
}

.pb-card-button {
	display: block;
	width: 100%;
	padding: 12px 20px;
	background: linear-gradient(135deg, var(--pb-card-blue) 0%, var(--pb-card-purple) 100%);
	color: #ffffff;
	text-align: center;
	font-weight: 600;
	font-size: 15px;
	border-radius: 8px;
	text-decoration: none;
	transition: all 0.2s ease;
	position: relative;
	overflow: hidden;
}

.pb-card-button::before {
	content: '';
	position: absolute;
	inset: 0;
	background: linear-gradient(135deg, var(--pb-card-purple) 0%, var(--pb-card-amber) 100%);
	opacity: 0;
	transition: opacity 0.2s ease;
}

.pb-card-button:hover {
	transform: translateY(-2px);
	box-shadow: 0 10px 15px -3px rgba(139, 92, 246, 0.3);
}

.pb-card-button:hover::before {
	opacity: 1;
}

.pb-card-button span {
	position: relative;
	z-index: 1;
}

/* ========================================
   Empty State
   ======================================== */

.pb-course-cards-empty {
	text-align: center;
	padding: 60px 20px;
	background: var(--pb-card-bg);
	border: 2px dashed var(--pb-card-border);
	border-radius: 12px;
	margin: 40px 0;
}

.pb-empty-icon {
	font-size: 64px;
	margin-bottom: 16px;
	opacity: 0.5;
	animation: float 3s ease-in-out infinite;
}

@keyframes float {
	0%, 100% {
		transform: translateY(0);
	}
	50% {
		transform: translateY(-10px);
	}
}

.pb-course-cards-empty h3 {
	font-size: 24px;
	font-weight: 700;
	color: var(--pb-card-text);
	margin: 0 0 8px 0;
}

.pb-course-cards-empty p {
	color: var(--pb-card-text-light);
	font-size: 16px;
	margin: 0;
}

/* ========================================
   Notice
   ======================================== */

.pb-notice {
	padding: 16px 20px;
	background: rgba(14, 165, 233, 0.1);
	border-left: 4px solid var(--pb-card-blue);
	border-radius: 8px;
	color: var(--pb-card-text);
	font-size: 15px;
	margin: 20px 0;
}

/* ========================================
   Public Catalog Cards (Guest View)
   ======================================== */

.pb-course-card--catalog .pb-card-catalog-label {
	position: absolute;
	top: 12px;
	left: 16px;
	font-family: 'SFMono-Regular', 'Consolas', monospace;
	font-size: 10px;
	font-weight: 700;
	letter-spacing: 0.12em;
	color: rgba(255, 255, 255, 0.75);
	text-transform: uppercase;
}

.pb-course-card--catalog .pb-card-header {
	position: relative;
}

.pb-card-desc {
	font-size: 13.5px;
	line-height: 1.6;
	color: var(--pb-card-text-light);
	margin: 8px 0 12px;
}

.pb-card-price {
	display: inline-block;
	font-size: 17px;
	font-weight: 700;
	color: var(--pb-card-text);
	background: rgba(14, 165, 233, 0.1);
	border: 1px solid rgba(14, 165, 233, 0.25);
	padding: 4px 12px;
	border-radius: 6px;
	letter-spacing: 0.02em;
	margin-top: 4px;
}

.pb-card-button--cta {
	background: linear-gradient(135deg, #0ea5e9 0%, #6366f1 100%);
}

.pb-card-button--cta:hover {
	background: linear-gradient(135deg, #0284c7 0%, #4f46e5 100%);
}



/* ========================================
   Dark Mode Support
   ======================================== */

@media (prefers-color-scheme: dark) {
	:root {
		--pb-card-bg: #1f2937;
		--pb-card-border: #374151;
		--pb-card-text: #f9fafb;
		--pb-card-text-light: #9ca3af;
	}
	
	.pb-card-gradient {
		opacity: 0.8;
	}
	
	.pb-course-card:hover .pb-card-gradient {
		opacity: 0.95;
	}
	
	.pb-progress-bar {
		background: #374151;
	}
}