/* ==================== 全局样式 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-light: #3b82f6;
    --primary-dark: #1d4ed8;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --info-color: #06b6d4;
    
    --bg-color: #f8fafc;
    --bg-sidebar: #ffffff;
    --bg-header: #ffffff;
    --bg-card: #ffffff;
    
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    
    --sidebar-width: 280px;
    --header-height: 64px;
    
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow: hidden;
}

/* ==================== 顶部导航栏 ==================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--bg-header);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 24px;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
    min-width: var(--sidebar-width);
}

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

.logo-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary-color), var(--info-color));
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 18px;
    font-weight: bold;
}

.logo-text h1 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.logo-text p {
    font-size: 11px;
    color: var(--text-muted);
    letter-spacing: 0.5px;
}

.header-center {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
}

.module-tabs {
    display: flex;
    background: var(--border-light);
    border-radius: 10px;
    padding: 4px;
}

.module-tab {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    border: none;
    background: transparent;
}

.module-tab:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.5);
}

.module-tab.active {
    background: white;
    color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.module-tab .icon {
    font-size: 16px;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.view-toggle {
    display: flex;
    background: var(--border-light);
    border-radius: 8px;
    padding: 3px;
}

.view-btn {
    padding: 6px 14px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    border: none;
    background: transparent;
    display: flex;
    align-items: center;
    gap: 6px;
}

.view-btn:hover {
    color: var(--text-primary);
}

.view-btn.active {
    background: white;
    color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

/* ==================== 主布局 ==================== */
.main-container {
    display: flex;
    height: calc(100vh - var(--header-height));
    margin-top: var(--header-height);
}

/* ==================== 侧边栏 ==================== */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: width var(--transition-normal);
}

.sidebar.collapsed {
    width: 0;
    border-right: none;
}

.sidebar-header {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.sidebar-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.sidebar-actions {
    display: flex;
    gap: 8px;
}

.icon-btn {
    width: 28px;
    height: 28px;
    border-radius: 6px;
    border: none;
    background: transparent;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    font-size: 14px;
}

.icon-btn:hover {
    background: var(--border-light);
    color: var(--text-primary);
}

/* 筛选面板 */
.filter-panel {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.filter-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.filter-options {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.filter-chip {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 5px 12px;
    border-radius: 16px;
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    border: 1px solid var(--border-color);
    background: white;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.filter-chip:hover {
    border-color: var(--primary-light);
    color: var(--primary-color);
}

.filter-chip.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.filter-chip .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

/* 章节树 */
.chapter-tree {
    flex: 1;
    overflow-y: auto;
    padding: 8px 0;
}

.chapter-item {
    margin-bottom: 4px;
}

.chapter-header {
    display: flex;
    align-items: center;
    padding: 10px 16px;
    cursor: pointer;
    transition: background var(--transition-fast);
    gap: 8px;
}

.chapter-header:hover {
    background: var(--border-light);
}

.chapter-header .arrow {
    width: 16px;
    height: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-fast);
    color: var(--text-muted);
    font-size: 10px;
}

.chapter-item.expanded .chapter-header .arrow {
    transform: rotate(90deg);
}

.chapter-number {
    font-size: 12px;
    font-weight: 600;
    color: var(--primary-color);
    background: rgba(37, 99, 235, 0.1);
    padding: 2px 8px;
    border-radius: 4px;
    white-space: nowrap;
}

.chapter-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    flex: 1;
}

.chapter-badge {
    font-size: 11px;
    padding: 2px 6px;
    border-radius: 4px;
    background: var(--border-light);
    color: var(--text-muted);
}

.section-list {
    display: none;
    padding-left: 40px;
}

.chapter-item.expanded .section-list {
    display: block;
}

.section-item {
    padding: 8px 12px 8px 8px;
    font-size: 13px;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 6px;
    margin: 2px 8px 2px 0;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 8px;
}

.section-item:hover {
    background: var(--border-light);
    color: var(--text-primary);
}

.section-item.active {
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary-color);
    font-weight: 500;
}

.section-item .section-icon {
    font-size: 12px;
    width: 16px;
    text-align: center;
}

.section-item.omitted {
    opacity: 0.5;
    text-decoration: line-through;
}

.section-item.self-study {
    font-style: italic;
}

.section-tags {
    margin-left: auto;
    display: flex;
    gap: 4px;
}

.tag-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
}

/* 子章节 */
.subsection-list {
    display: none;
    padding-left: 20px;
}

.section-item.has-subsections.expanded + .subsection-list {
    display: block;
}

.subsection-item {
    padding: 6px 12px 6px 8px;
    font-size: 12px;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: 4px;
    margin: 2px 8px 2px 0;
    transition: all var(--transition-fast);
}

.subsection-item:hover {
    background: var(--border-light);
    color: var(--text-secondary);
}

.subsection-item.active {
    color: var(--primary-color);
    font-weight: 500;
}

/* 实验部分 */
.experiments-section {
    padding: 12px 16px;
    border-top: 1px solid var(--border-color);
}

.experiments-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.experiment-item {
    padding: 8px 12px;
    font-size: 13px;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 6px;
    margin-bottom: 2px;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 8px;
}

.experiment-item:hover {
    background: var(--border-light);
    color: var(--text-primary);
}

.experiment-item.active {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
    font-weight: 500;
}

/* ==================== 主内容区 ==================== */
.content-area {
    flex: 1;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    position: relative;
}

/* 内容头部 */
.content-header {
    padding: 20px 32px;
    background: white;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-secondary);
}

.breadcrumb-item {
    color: var(--text-secondary);
}

.breadcrumb-item.current {
    color: var(--text-primary);
    font-weight: 500;
}

.breadcrumb-separator {
    color: var(--text-muted);
}

.content-actions {
    display: flex;
    gap: 8px;
}

.btn {
    padding: 8px 16px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: white;
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.btn:hover {
    border-color: var(--primary-light);
    color: var(--primary-color);
}

.btn-primary {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    color: white;
}

/* 内容主体 */
.content-body {
    flex: 1;
    overflow-y: auto;
    padding: 32px;
}

/* 欢迎页面 */
.welcome-page {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
    padding: 40px 0;
}

.welcome-hero {
    margin-bottom: 48px;
}

.welcome-hero h2 {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
    background: linear-gradient(135deg, var(--primary-color), var(--info-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.welcome-hero p {
    font-size: 16px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.module-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 48px;
}

.module-card {
    background: white;
    border-radius: 16px;
    padding: 32px 24px;
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: all var(--transition-normal);
    text-align: left;
}

.module-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.module-card-icon {
    width: 56px;
    height: 56px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    margin-bottom: 16px;
}

.module-card.learning .module-card-icon {
    background: linear-gradient(135deg, #dbeafe, #bfdbfe);
}

.module-card.training .module-card-icon {
    background: linear-gradient(135deg, #fef3c7, #fde68a);
}

.module-card.testing .module-card-icon {
    background: linear-gradient(135deg, #d1fae5, #a7f3d0);
}

.module-card h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.module-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.stats-section {
    background: white;
    border-radius: 16px;
    padding: 32px;
    border: 1px solid var(--border-color);
}

.stats-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 24px;
    text-align: left;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 4px;
}

.stat-label {
    font-size: 13px;
    color: var(--text-secondary);
}

/* 章节内容页 */
.section-content-page {
    max-width: 900px;
    margin: 0 auto;
}

.section-header {
    margin-bottom: 32px;
}

.section-header .chapter-breadcrumb {
    font-size: 14px;
    color: var(--primary-color);
    margin-bottom: 8px;
    font-weight: 500;
}

.section-header h2 {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.section-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 24px;
}

.meta-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}

.meta-tag.objective {
    background: rgba(155, 89, 182, 0.1);
    color: #8e44ad;
}

.meta-tag.type {
    background: rgba(231, 76, 60, 0.1);
    color: #c0392b;
}

.meta-tag.type.analysis {
    background: rgba(52, 152, 219, 0.1);
    color: #2980b9;
}

.meta-tag.type.design {
    background: rgba(46, 204, 113, 0.1);
    color: #27ae60;
}

.content-placeholder {
    background: white;
    border-radius: 12px;
    padding: 48px 32px;
    border: 1px solid var(--border-color);
    text-align: center;
}

.content-placeholder-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.content-placeholder h3 {
    font-size: 18px;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.content-placeholder p {
    font-size: 14px;
    color: var(--text-secondary);
}

/* 学习资源卡片列表 */
.resource-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.resource-card {
    background: white;
    border-radius: 12px;
    padding: 24px;
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.resource-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--primary-light);
}

.resource-card-header {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 12px;
}

.resource-icon {
    width: 48px;
    height: 48px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    flex-shrink: 0;
    background: var(--border-light);
}

.resource-card h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.resource-card .resource-desc {
    font-size: 14px;
    color: var(--text-secondary);
    flex: 1;
}

.resource-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 12px;
    border-top: 1px solid var(--border-light);
}

.resource-tags {
    display: flex;
    gap: 6px;
}

.resource-tag {
    padding: 3px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 500;
    background: var(--border-light);
    color: var(--text-secondary);
}

.resource-meta {
    font-size: 12px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 4px;
}

/* ==================== 知识图谱视图 ==================== */
.graph-view {
    width: 100%;
    height: 100%;
    position: relative;
    overflow: hidden;
    background: #0f172a;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(59, 130, 246, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(139, 92, 246, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 1px 1px, rgba(255, 255, 255, 0.04) 1px, transparent 0);
    background-size: 100% 100%, 100% 100%, 24px 24px;
}

.graph-canvas {
    position: absolute;
    top: 0;
    left: 0;
    cursor: grab;
    transition: none;
}

.graph-canvas:active {
    cursor: grabbing;
}

/* 图谱模式切换 */
.graph-mode-selector {
    position: absolute;
    top: 16px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    gap: 8px;
    z-index: 15;
}

.graph-cat-switcher {
    display: flex;
    background: rgba(30, 41, 59, 0.9);
    backdrop-filter: blur(12px);
    border-radius: 10px;
    padding: 4px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    justify-content: center;
}

.graph-cat-btn {
    padding: 6px 16px;
    border-radius: 7px;
    cursor: pointer;
    font-size: 12px;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.5);
    transition: all 0.2s ease;
    border: none;
    background: transparent;
    display: flex;
    align-items: center;
    gap: 5px;
    white-space: nowrap;
}

.graph-cat-btn:hover {
    color: rgba(255, 255, 255, 0.85);
    background: rgba(255, 255, 255, 0.05);
}

.graph-cat-btn.active {
    background: rgba(99, 102, 241, 0.25);
    color: #a5b4fc;
    box-shadow: inset 0 0 0 1px rgba(99, 102, 241, 0.4);
}

.graph-mode-buttons {
    display: flex;
    background: rgba(30, 41, 59, 0.9);
    backdrop-filter: blur(12px);
    border-radius: 10px;
    padding: 4px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    justify-content: center;
}

.graph-mode-btn {
    padding: 8px 18px;
    border-radius: 7px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.6);
    transition: all 0.2s ease;
    border: none;
    background: transparent;
    display: flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
}

.graph-mode-btn:hover {
    color: rgba(255, 255, 255, 0.9);
    background: rgba(255, 255, 255, 0.05);
}

.graph-mode-btn.active {
    background: linear-gradient(135deg, #3b82f6, #6366f1);
    color: white;
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.4);
}

.graph-mode-btn .mode-icon {
    font-size: 14px;
}

/* 控制按钮 */
.graph-controls {
    position: absolute;
    bottom: 24px;
    right: 24px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    background: rgba(30, 41, 59, 0.9);
    backdrop-filter: blur(12px);
    border-radius: 10px;
    padding: 6px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    z-index: 10;
}

.graph-control-btn {
    width: 36px;
    height: 36px;
    border-radius: 7px;
    border: none;
    background: transparent;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: rgba(255, 255, 255, 0.6);
    transition: all 0.15s ease;
}

.graph-control-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

/* 图例 */
.graph-legend {
    position: absolute;
    top: 16px;
    right: 16px;
    background: rgba(30, 41, 59, 0.9);
    backdrop-filter: blur(12px);
    border-radius: 10px;
    padding: 14px 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    z-index: 10;
    min-width: 140px;
}

.graph-legend-title {
    font-size: 12px;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 7px;
    font-size: 12px;
    color: rgba(255, 255, 255, 0.65);
}

.legend-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
}

.legend-item:last-child {
    margin-bottom: 0;
}

/* 信息提示框 */
.graph-tooltip {
    position: absolute;
    background: rgba(30, 41, 59, 0.95);
    backdrop-filter: blur(12px);
    border-radius: 10px;
    padding: 12px 16px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.15);
    pointer-events: none;
    z-index: 20;
    min-width: 200px;
    display: none;
}

.graph-tooltip-title {
    font-size: 14px;
    font-weight: 600;
    color: white;
    margin-bottom: 4px;
}

.graph-tooltip-chapter {
    font-size: 12px;
    color: #60a5fa;
    margin-bottom: 6px;
}

.graph-tooltip-info {
    font-size: 11px;
    color: rgba(255, 255, 255, 0.5);
}

/* SVG 节点样式 */
.graph-node {
    cursor: pointer;
}

.graph-node circle {
    transition: r 0.2s ease, stroke-width 0.2s ease, filter 0.2s ease;
}

.graph-node:hover circle {
    stroke-width: 3;
    filter: drop-shadow(0 0 8px currentColor);
}

.graph-node text {
    font-size: 11px;
    fill: rgba(255, 255, 255, 0.85);
    font-weight: 500;
    pointer-events: none;
    text-anchor: middle;
    dominant-baseline: middle;
}

.graph-node text.label-below {
    dominant-baseline: hanging;
}

/* 中心节点特殊样式 */
.graph-node.is-hub circle {
    filter: drop-shadow(0 0 12px rgba(99, 102, 241, 0.5));
}

/* 连线样式 */
.graph-link {
    fill: none;
    opacity: 0.25;
    transition: opacity 0.2s ease, stroke 0.2s ease, stroke-width 0.2s ease;
}

.graph-link.highlighted {
    opacity: 0.9;
    stroke-width: 2.5;
}

/* 连线标签 */
.graph-link-label {
    font-size: 9px;
    fill: rgba(255, 255, 255, 0.35);
    pointer-events: none;
    text-anchor: middle;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.graph-link-label.highlighted {
    opacity: 1;
    fill: #60a5fa;
}

/* 节点高亮（悬停相关） */
.graph-node.dimmed {
    opacity: 0.2;
}

.graph-link.dimmed {
    opacity: 0.05;
}

/* 径向布局的环 */
.graph-ring {
    fill: none;
    stroke: rgba(255, 255, 255, 0.12);
    stroke-width: 1.5;
    stroke-dasharray: 6 5;
}

/* 加载动画 */
.graph-loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: rgba(255, 255, 255, 0.5);
    font-size: 14px;
    z-index: 5;
}

/* 训练资源样式 */
.training-section {
    margin-bottom: 32px;
}

.training-section-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.training-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.training-card {
    background: white;
    border-radius: 12px;
    padding: 20px;
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.training-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--warning-color);
    transform: translateY(-2px);
}

/* 可进入交互电路的训练卡片（lab 入口） */
.training-card.has-lab {
    border-color: #3b82f6;
    background: linear-gradient(135deg, #ffffff 0%, #eff6ff 100%);
}

.training-card-header {
    display: flex;
    align-items: center;
    gap: 12px;
}

.training-icon {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    background: linear-gradient(135deg, #fef3c7, #fde68a);
}

.training-card h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
}

.training-card p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.training-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 12px;
    border-top: 1px solid var(--border-light);
}

.difficulty-badge {
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
}

.difficulty-easy {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
}

.difficulty-medium {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning-color);
}

.difficulty-hard {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
}

.question-count {
    font-size: 12px;
    color: var(--text-muted);
}

/* 测试资源样式 */
.test-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.test-card {
    background: white;
    border-radius: 12px;
    padding: 24px;
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.test-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--success-color);
}

.test-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.test-card h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.test-type-badge {
    padding: 4px 12px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 500;
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
}

.test-info {
    display: flex;
    gap: 24px;
    margin-bottom: 12px;
}

.test-info-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text-secondary);
}

.test-desc {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.test-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 12px;
    border-top: 1px solid var(--border-light);
}

.test-score {
    font-size: 13px;
    color: var(--text-muted);
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 60px 20px;
}

.empty-state-icon {
    font-size: 64px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 18px;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.empty-state p {
    font-size: 14px;
    color: var(--text-secondary);
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .module-cards {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .training-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: var(--header-height);
        bottom: 0;
        z-index: 50;
        transform: translateX(-100%);
        transition: transform var(--transition-normal);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .header-center {
        display: none;
    }
    
    .content-body {
        padding: 16px;
    }
}

/* ==================== 专题导航 ==================== */
.focus-view {
    padding: 8px 0;
}

.focus-hero {
    text-align: center;
    padding: 32px 20px 24px;
}

.focus-hero h2 {
    font-size: 26px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.focus-hero p {
    font-size: 14px;
    color: var(--text-secondary);
}

.focus-section {
    margin-bottom: 32px;
}

.focus-section-title {
    font-size: 17px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
    padding-left: 4px;
}

.focus-section-desc {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 16px;
    padding-left: 4px;
}

/* 核心电路卡片 */
.core-circuits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 14px;
}

.core-circuit-card {
    display: flex;
    gap: 14px;
    padding: 18px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.25s ease;
    border-left: 4px solid var(--circuit-color);
}

.core-circuit-card:hover {
    border-color: var(--circuit-color);
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    transform: translateY(-2px);
}

.circuit-icon {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    flex-shrink: 0;
}

.circuit-info h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.circuit-info p {
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 8px;
}

.circuit-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
}

/* 分类卡片 */
.focus-cat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 14px;
}

.focus-cat-card {
    display: flex;
    gap: 14px;
    padding: 18px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.25s ease;
    border-left: 4px solid var(--cat-color);
}

.focus-cat-card:hover {
    border-color: var(--cat-color);
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    transform: translateY(-2px);
}

.focus-cat-icon {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    flex-shrink: 0;
}

.focus-cat-info h3 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.focus-cat-info p {
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 6px;
}

.focus-cat-count {
    font-size: 11px;
    color: var(--cat-color);
    font-weight: 500;
}

/* 小标签 */
.mini-tag {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 500;
    line-height: 1.4;
}

.mini-tag.obj-tag {
    background: rgba(139, 92, 246, 0.15);
    color: #8b5cf6;
}

.mini-tag.design-tag {
    background: rgba(46, 204, 113, 0.15);
    color: #2ecc71;
}

.mini-tag.circuit-tag {
    font-size: 10px;
}

/* 详情页面 */
.focus-detail-view {
    padding: 8px 0;
}

.focus-detail-hero {
    text-align: center;
    padding: 36px 24px 28px;
    border-radius: 16px;
    margin-bottom: 24px;
}

.focus-detail-icon {
    font-size: 40px;
    margin-bottom: 12px;
}

.focus-detail-hero h2 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.focus-detail-hero p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    max-width: 600px;
    margin: 0 auto 14px;
}

.focus-detail-tags {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 6px;
}

.focus-detail-stats {
    display: flex;
    justify-content: center;
    gap: 48px;
    margin-bottom: 28px;
}

.focus-stat {
    text-align: center;
}

.focus-stat .stat-num {
    display: block;
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
}

.focus-stat .stat-label {
    font-size: 12px;
    color: var(--text-secondary);
}

/* 核心电路选择条 */
.focus-circuits-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 24px;
}

.focus-circuit-pill {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all 0.2s ease;
}

.focus-circuit-pill:hover {
    border-color: var(--pill-color);
    color: var(--pill-color);
}

.focus-circuit-pill.active {
    background: var(--pill-color)15;
    border-color: var(--pill-color);
    color: var(--pill-color);
}

/* 知识点卡片网格 */
.kp-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
}

@media (max-width: 700px) {
    .kp-grid {
        grid-template-columns: 1fr;
    }
}

/* ==================== 核心电路详情页：内容分区（虚线框） ==================== */
.circuit-region {
    border: 2px dashed;
    border-radius: 14px;
    padding: 18px;
    margin: 18px 0;
}

.circuit-region.region-learning {
    border-color: rgba(59, 130, 246, 0.45);
    background: rgba(59, 130, 246, 0.04);
}

.circuit-region.region-training {
    border-color: rgba(245, 158, 11, 0.5);
    background: rgba(245, 158, 11, 0.04);
}

.circuit-region-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 14px;
}

.circuit-region-title .circuit-region-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: inline-block;
}

.region-learning .circuit-region-dot { background: #3b82f6; }
.region-learning .circuit-region-title { color: #3b82f6; }
.region-training .circuit-region-dot { background: #f59e0b; }
.region-training .circuit-region-title { color: #f59e0b; }
.region-calc { border-color: rgba(231, 76, 60, 0.45); background: rgba(231, 76, 60, 0.04); }
.region-calc .circuit-region-dot { background: #e74c3c; }
.region-calc .circuit-region-title { color: #e74c3c; }
.region-design { border-color: rgba(46, 204, 113, 0.45); background: rgba(46, 204, 113, 0.04); }
.region-design .circuit-region-dot { background: #2ecc71; }
.region-design .circuit-region-title { color: #2ecc71; }

/* 空态占位（题型等内容未建时） */
.region-empty {
    padding: 26px 16px;
    text-align: center;
    color: #94a3b8;
    font-size: 14px;
    border: 1px dashed rgba(148, 163, 184, 0.4);
    border-radius: 10px;
    background: rgba(148, 163, 184, 0.05);
}

/* ===== 专题页（游戏闯关 / 题型解析）：分支电路卡 + 案例模块 ===== */
.branch-card {
    position: relative;
    cursor: pointer;
}

.branch-card.active {
    box-shadow: 0 0 0 2px var(--card-color), 0 4px 14px rgba(0, 0, 0, 0.1);
}

.branch-count {
    flex-shrink: 0;
    font-size: 12px;
    font-weight: 600;
    color: var(--card-color, #64748b);
    background: rgba(100, 116, 139, 0.1);
    border-radius: 10px;
    padding: 3px 10px;
    margin-left: 8px;
}

/* 案例模块（插在计算题型与设计题型之间） */
.case-module {
    margin: 18px 0;
    padding: 18px;
    border-radius: 14px;
    border: 2px solid var(--case-color, #e74c3c);
    background: rgba(255, 255, 255, 0.6);
    animation: caseIn 0.28s ease;
}

@keyframes caseIn {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

.case-module-header {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 16px;
    font-weight: 700;
    color: var(--case-color, #e74c3c);
    margin-bottom: 14px;
}

.case-module-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--case-color, #e74c3c);
    display: inline-block;
}

.case-module-count {
    font-size: 12px;
    font-weight: 500;
    color: #64748b;
    background: rgba(100, 116, 139, 0.1);
    border-radius: 10px;
    padding: 2px 10px;
}

.case-module-close {
    margin-left: auto;
    cursor: pointer;
    font-size: 14px;
    font-weight: 700;
    color: #94a3b8;
    padding: 2px 8px;
    border-radius: 8px;
    transition: all 0.2s;
}

.case-module-close:hover {
    color: #ef4444;
    background: rgba(239, 68, 68, 0.1);
}

.case-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
}

.case-card {
    border: 1px solid rgba(148, 163, 184, 0.35);
    border-radius: 12px;
    overflow: hidden;
    background: var(--bg-card, #fff);
    transition: all 0.2s;
}

.case-card.has-lab {
    cursor: pointer;
    border-color: rgba(59, 130, 246, 0.45);
}

.case-card.has-lab:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

.case-thumb {
    position: relative;
    aspect-ratio: 16 / 10;
    background: #0b3d22;
}

.case-index {
    position: absolute;
    left: 8px;
    top: 8px;
    font-size: 11px;
    font-weight: 700;
    color: #0b3d22;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 8px;
    padding: 2px 8px;
}

.case-meta {
    padding: 10px 12px 12px;
}

.case-meta h5 {
    font-size: 14px;
    font-weight: 700;
    color: var(--text-primary, #1e293b);
    margin-bottom: 4px;
}

.case-meta p {
    font-size: 12px;
    color: var(--text-secondary, #64748b);
    line-height: 1.5;
    min-height: 34px;
}

.case-state {
    display: inline-block;
    margin-top: 6px;
    font-size: 11px;
    font-weight: 600;
    color: #94a3b8;
    background: rgba(148, 163, 184, 0.12);
    border-radius: 8px;
    padding: 2px 8px;
}

.case-state.ready {
    color: #2563eb;
    background: rgba(37, 99, 235, 0.1);
}

.topic-hint {
    margin: 22px 0 8px;
    text-align: center;
    font-size: 13px;
    color: #94a3b8;
}

@media (max-width: 900px) {
    .case-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px) {
    .case-grid { grid-template-columns: 1fr; }
}

.circuit-region-count {
    font-size: 12px;
    font-weight: 500;
    color: #64748b;
    background: rgba(100, 116, 139, 0.1);
    border-radius: 10px;
    padding: 2px 10px;
    margin-left: 4px;
}

.kp-card-desc {
    font-size: 13px;
    color: #64748b;
    line-height: 1.6;
    margin: 8px 0 0 0;
}

/* 详情页两列卡片网格（样式同首页重点难点卡片） */
.home-core-grid.core-grid-2 {
    grid-template-columns: repeat(2, 1fr);
    max-width: none;
    gap: 12px;
}

@media (max-width: 700px) {
    .home-core-grid.core-grid-2 {
        grid-template-columns: 1fr;
    }
}

.home-core-desc {
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ==================== 16:9 交互式电路弹窗 ==================== */
.circuit-lab-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.88);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
}

.circuit-lab-overlay iframe {
    width: min(96vw, calc(93vh * 16 / 9));
    aspect-ratio: 16 / 9;
    border: none;
    border-radius: 10px;
    background: #0a3d20;
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.7);
}

.home-core-card.has-lab {
    cursor: pointer;
}

.home-core-card.has-lab:hover .home-core-arrow {
    opacity: 1;
    transform: translateX(3px);
}

.lab-hint {
    color: #3b82f6;
    font-size: 11px;
    margin-left: 6px;
    font-weight: 600;
}

.kp-card {
    padding: 18px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.25s ease;
    border-left: 4px solid var(--card-accent);
}

.kp-card:hover {
    border-color: var(--card-accent);
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    transform: translateY(-2px);
}

.kp-card-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}

.kp-card-icon {
    font-size: 18px;
}

.kp-card-header h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
}

.kp-card-meta {
    margin-bottom: 8px;
}

.kp-chapter {
    font-size: 12px;
    color: var(--text-secondary);
}

.kp-card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin-bottom: 14px;
}

.kp-card-actions {
    display: flex;
    gap: 8px;
}

.kp-btn {
    flex: 1;
    padding: 7px 10px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    cursor: pointer;
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all 0.2s ease;
}

.kp-btn:hover {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

/* 响应式 */
@media (max-width: 768px) {
    .core-circuits-grid,
    .focus-cat-grid,
    .kp-grid {
        grid-template-columns: 1fr;
    }
    
    .focus-detail-stats {
        gap: 32px;
    }
}

/* ==================== 首页新设计 ==================== */
.home-page {
    padding: 0 0 40px;
    max-width: 960px;
    margin: 0 auto;
}

/* Hero 区域 */
.home-hero {
    position: relative;
    padding: 32px 36px 28px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 16px;
    color: white;
    overflow: hidden;
    margin-bottom: 28px;
}

.home-hero-content {
    position: relative;
    z-index: 2;
}

.home-hero-badge {
    display: inline-block;
    padding: 5px 14px;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 2px;
    margin-bottom: 16px;
}

.home-hero-title {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: 1px;
}

.home-hero-subtitle {
    font-size: 15px;
    opacity: 0.85;
    margin-bottom: 28px;
    font-weight: 300;
}

.home-hero-stats {
    display: flex;
    align-items: center;
    gap: 28px;
}

.home-hero-stat {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.home-hero-stat .stat-num {
    font-size: 26px;
    font-weight: 700;
    line-height: 1;
}

.home-hero-stat .stat-label {
    font-size: 12px;
    color: #fcd34d;
    opacity: 0.95;
}

.home-hero-divider {
    width: 1px;
    height: 28px;
    background: rgba(255, 255, 255, 0.25);
}

/* 装饰圆形 */
.home-hero-deco {
    position: absolute;
    top: 0;
    right: 0;
    width: 400px;
    height: 100%;
    pointer-events: none;
}

.deco-circle {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.08);
}

.deco-1 {
    width: 200px;
    height: 200px;
    top: -60px;
    right: 40px;
}

.deco-2 {
    width: 120px;
    height: 120px;
    top: 80px;
    right: 160px;
    background: rgba(255, 255, 255, 0.06);
}

.deco-3 {
    width: 80px;
    height: 80px;
    bottom: 40px;
    right: 60px;
    background: rgba(255, 255, 255, 0.1);
}

/* 通用 section 样式 */
.home-section {
    margin-bottom: 24px;
    padding: 18px 20px 16px;
    background: var(--bg-card);
    border: 1.5px dashed var(--border-color);
    border-radius: 14px;
}

/* 课程资源区 - 蓝色系 */
.home-section:nth-of-type(1) {
    border-color: #3b82f640;
    background: #3b82f606;
}

/* 重点难区 - 橙色系 */
.home-section:nth-of-type(2) {
    border-color: #f59e0b40;
    background: #f59e0b06;
}

/* 题型区 - 绿色系 */
.home-section:nth-of-type(3) {
    border-color: #10b98140;
    background: #10b98106;
}

.home-section-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    margin-bottom: 18px;
    text-align: center;
}

.home-section-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.home-section-desc {
    font-size: 13px;
    color: var(--text-secondary);
}

.home-section-more {
    background: none;
    border: none;
    color: var(--accent-color);
    font-size: 12px;
    cursor: pointer;
    font-weight: 500;
    padding: 2px 8px;
    border-radius: 6px;
    transition: background 0.2s;
    margin-top: 2px;
}

.home-section-more:hover {
    background: var(--accent-color)10;
}

/* 课程资源卡片 */
.home-modules-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.home-module-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    flex: 1;
    min-width: 180px;
    max-width: none;
}

.home-module-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    transition: width 0.3s ease;
}

.home-module-card.learning::before { background: #3b82f6; }
.home-module-card.training::before { background: #f59e0b; }
.home-module-card.testing::before { background: #10b981; }

.home-module-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
    border-color: transparent;
}

.home-module-card:hover::before {
    width: 6px;
}

.home-module-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.home-module-card.learning .home-module-icon {
    background: #3b82f615;
    color: #3b82f6;
}

.home-module-card.training .home-module-icon {
    background: #f59e0b15;
    color: #f59e0b;
}

.home-module-card.testing .home-module-icon {
    background: #10b98115;
    color: #10b981;
}

.home-module-icon svg {
    width: 20px;
    height: 20px;
}

.home-module-info {
    flex: 1;
}

.home-module-info h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.home-module-info p {
    font-size: 11px;
    color: var(--text-secondary);
    margin: 0;
}

.home-module-arrow {
    color: var(--text-tertiary);
    font-size: 16px;
    transition: transform 0.3s ease, color 0.3s ease;
    opacity: 0.5;
}

.home-module-card:hover .home-module-arrow {
    transform: translateX(4px);
    color: var(--accent-color);
    opacity: 1;
}

/* 重难点卡片 */
.home-core-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    max-width: 800px;
    margin: 0 auto;
}

/* 游戏闯关：3 行 2 列 */
.home-game-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    max-width: 800px;
    margin: 0 auto;
}

.home-core-card {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 12px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.25s ease;
    border-left: 3px solid var(--card-color);
    min-width: 0;
}

.home-core-icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    flex-shrink: 0;
}

.home-core-info {
    flex: 1;
    min-width: 0;
}

.home-core-info h4 {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 3px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.home-core-badges {
    display: flex;
    gap: 4px;
}

.home-core-arrow {
    color: var(--text-tertiary);
    font-size: 12px;
    opacity: 0.4;
    transition: all 0.25s ease;
    flex-shrink: 0;
}

.home-core-card:hover {
    border-color: var(--card-color);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    transform: translateY(-2px);
}

.home-core-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    flex-shrink: 0;
}

.home-core-info {
    flex: 1;
    min-width: 0;
}

.home-core-info h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.home-core-badges {
    display: flex;
    gap: 4px;
}

.home-badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 7px;
    border-radius: 4px;
    font-size: 10px;
    font-weight: 500;
    line-height: 1.4;
}

.key-badge {
    background: #f59e0b15;
    color: #f59e0b;
}

.diff-badge {
    background: #ef444415;
    color: #ef4444;
}

.home-core-arrow {
    color: var(--text-tertiary);
    font-size: 14px;
    opacity: 0.4;
    transition: all 0.25s ease;
}

.home-core-card:hover .home-core-arrow {
    opacity: 1;
    color: var(--card-color);
    transform: translateX(3px);
}

/* 题型区 */
.home-qtype-grid {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

.home-qtype-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: 18px 20px;
    transition: all 0.3s ease;
    flex: 1;
    min-width: 240px;
    max-width: 340px;
}

.home-qtype-card:hover {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    transform: translateY(-2px);
}

.home-qtype-card.calc {
    border-top: 4px solid #e74c3c;
}

.home-qtype-card.design {
    border-top: 4px solid #2ecc71;
}

.home-qtype-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}

.home-qtype-icon {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}

.calc-icon {
    background: #e74c3c15;
}

.design-icon {
    background: #2ecc7115;
}

.home-qtype-header h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    flex: 1;
}

.home-qtype-count {
    font-size: 12px;
    color: var(--text-secondary);
    background: var(--bg-secondary);
    padding: 3px 8px;
    border-radius: 10px;
}

.home-qtype-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
}

.home-q-item-card {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 10px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 12px;
    color: var(--text-secondary);
    transition: all 0.2s ease;
    background: var(--bg-secondary);
    border-left: 3px solid var(--qcard-color);
}

.home-q-item-card:hover {
    background: var(--qcard-color)10;
    color: var(--text-primary);
    transform: translateX(3px);
}

.home-q-item-icon {
    width: 26px;
    height: 26px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    flex-shrink: 0;
}

/* 响应式 */
@media (max-width: 680px) {
    .home-core-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 500px) {
    .home-hero {
        padding: 32px 24px 28px;
    }
    
    .home-hero-title {
        font-size: 26px;
    }
    
    .home-hero-stats {
        flex-wrap: wrap;
        gap: 20px;
    }
    
    .home-hero-divider {
        display: none;
    }
    
    .home-modules-grid {
        grid-template-columns: 1fr;
    }
    
    .home-module-card {
        max-width: none;
    }
    
    .home-qtype-grid {
        flex-direction: column;
        align-items: stretch;
    }
    
    .home-qtype-card {
        max-width: none;
    }
    
    .home-core-grid {
        grid-template-columns: 1fr;
    }
    
    .home-qtype-list {
        grid-template-columns: 1fr;
    }
    
    .home-hero-deco {
        display: none;
    }
}