/* ============================================
   CSS变量定义 - 支持深色/浅色主题
   ============================================ */
:root {
    /* 浅色主题颜色 */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-muted: #adb5bd;
    
    /* 强调色 */
    --color-accent: #4f46e5;
    --color-accent-light: #818cf8;
    --color-accent-dark: #3730a3;
    
    /* 状态色 */
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    --color-info: #3b82f6;
    
    /* 渐变色 */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-success: linear-gradient(135deg, #10b981 0%, #059669 100%);
    --gradient-warning: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    --gradient-danger: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* 边框 */
    --border-color: #e5e7eb;
    --border-radius-sm: 6px;
    --border-radius-md: 10px;
    --border-radius-lg: 16px;
    
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* 动画 */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* 深色主题 */
[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #404040;
    --text-primary: #f5f5f5;
    --text-secondary: #b0b0b0;
    --text-muted: #808080;
    --border-color: #404040;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
}

/* ============================================
   基础样式
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: background-color var(--transition-base), color var(--transition-base);
}

/* ============================================
   阅读进度条
   ============================================ */
.progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 4px;
    background: var(--gradient-primary);
    z-index: 9999;
    transition: width 0.1s ease;
    box-shadow: 0 0 10px rgba(102, 126, 234, 0.5);
}

/* ============================================
   导航栏
   ============================================ */
.navbar {
    position: sticky;
    top: 0;
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: 1.25rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-sm);
}

.nav-toggle,
.theme-toggle {
    background: transparent;
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    font-size: 1.2rem;
    transition: all var(--transition-base);
}

.nav-toggle:hover,
.theme-toggle:hover {
    background-color: var(--bg-secondary);
    transform: translateY(-2px);
}

/* ============================================
   侧边栏目录
   ============================================ */
.sidebar {
    position: fixed;
    left: -300px;
    top: 60px;
    width: 280px;
    height: calc(100vh - 60px);
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    padding: var(--spacing-md);
    overflow-y: auto;
    transition: left var(--transition-base);
    z-index: 999;
    box-shadow: var(--shadow-lg);
}

.sidebar.active {
    left: 0;
}

.sidebar-content h3 {
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    font-size: 1.1rem;
}

.catalog {
    list-style: none;
}

.catalog li {
    margin-bottom: var(--spacing-sm);
}

.catalog a {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.5rem 0.75rem;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
    font-size: 0.95rem;
}

.catalog a:hover {
    color: var(--color-accent);
    background-color: var(--bg-tertiary);
    padding-left: 1rem;
}

.catalog a.active {
    color: var(--color-accent);
    background-color: var(--bg-tertiary);
    font-weight: 600;
    border-left: 3px solid var(--color-accent);
}

/* ============================================
   主内容区
   ============================================ */
.main-content {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-md);
    transition: margin-left var(--transition-base);
}

.article {
    background-color: var(--bg-primary);
}

/* ============================================
   文章标题区
   ============================================ */
.article-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-xl);
    background: var(--gradient-primary);
    border-radius: var(--border-radius-lg);
    color: white;
    box-shadow: var(--shadow-lg);
}

.article-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: var(--spacing-sm);
    line-height: 1.2;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.article-subtitle {
    font-size: 1.25rem;
    opacity: 0.95;
    margin-bottom: var(--spacing-md);
}

.article-meta {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-md);
    font-size: 0.9rem;
    opacity: 0.9;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.article-actions {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.btn-action {
    background-color: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.4);
    color: white;
    padding: 0.6rem 1.5rem;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 600;
    transition: all var(--transition-base);
    backdrop-filter: blur(10px);
}

.btn-action:hover {
    background-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-3px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
}

.btn-action.active {
    background-color: rgba(255, 255, 255, 0.4);
    border-color: rgba(255, 255, 255, 0.6);
}

/* ============================================
   内容区块
   ============================================ */
.content-section {
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background-color: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    animation: fadeInUp 0.6s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.content-section h2 {
    font-size: 2rem;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
    border-bottom: 3px solid var(--color-accent);
    padding-bottom: var(--spacing-sm);
    display: inline-block;
}

.content-section h3 {
    font-size: 1.5rem;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.content-section h4 {
    font-size: 1.25rem;
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.content-section p {
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
    color: var(--text-secondary);
}

.content-section ul,
.content-section ol {
    margin-bottom: var(--spacing-md);
    margin-left: var(--spacing-lg);
    color: var(--text-secondary);
}

.content-section li {
    margin-bottom: var(--spacing-xs);
    line-height: 1.8;
}

/* ============================================
   大纲预览
   ============================================ */
.outline-section {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    margin-bottom: var(--spacing-xl);
}

[data-theme="dark"] .outline-section {
    background: linear-gradient(135deg, #2d2d2d 0%, #404040 100%);
}

.outline-list {
    margin-left: var(--spacing-lg);
}

.outline-list li {
    margin-bottom: var(--spacing-sm);
    line-height: 1.8;
}

/* ============================================
   场景卡片
   ============================================ */
.scenario-card {
    background-color: var(--bg-secondary);
    border-left: 4px solid var(--color-info);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.scenario-card:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-md);
}

.scenario-card h3 {
    color: var(--color-info);
    margin-bottom: var(--spacing-sm);
    font-size: 1.1rem;
}

/* ============================================
   高亮框
   ============================================ */
.highlight-box {
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    margin-bottom: var(--spacing-md);
    border-left: 4px solid;
    box-shadow: var(--shadow-sm);
}

.highlight-box.thinking {
    background-color: #fef3c7;
    border-color: var(--color-warning);
}

[data-theme="dark"] .highlight-box.thinking {
    background-color: rgba(245, 158, 11, 0.1);
}

.highlight-box.insight {
    background-color: #dbeafe;
    border-color: var(--color-info);
}

[data-theme="dark"] .highlight-box.insight {
    background-color: rgba(59, 130, 246, 0.1);
}

.highlight-box.game {
    background-color: #e0e7ff;
    border-color: var(--color-accent);
}

[data-theme="dark"] .highlight-box.game {
    background-color: rgba(79, 70, 229, 0.1);
}

/* ============================================
   问题框
   ============================================ */
.question-box {
    background: var(--gradient-primary);
    color: white;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    margin: var(--spacing-lg) 0;
    text-align: center;
    box-shadow: var(--shadow-lg);
}

.question-box p {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: white;
}

/* ============================================
   列表样式
   ============================================ */
.wrong-list {
    list-style: none;
    margin-left: 0;
}

.wrong-list li {
    padding-left: 1.5rem;
    position: relative;
}

.emphasis {
    font-weight: 600;
    color: var(--color-danger);
    padding: var(--spacing-sm);
    background-color: rgba(239, 68, 68, 0.1);
    border-radius: var(--border-radius-sm);
    display: inline-block;
}

/* ============================================
   对比表格
   ============================================ */
.comparison-table,
.praise-table,
.goal-table,
.reframe-table,
.attribution-reframe {
    overflow-x: auto;
    margin: var(--spacing-md) 0;
}

table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

thead {
    background: var(--gradient-primary);
    color: white;
}

th {
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 600;
}

td {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

tbody tr:last-child td {
    border-bottom: none;
}

tbody tr {
    transition: background-color var(--transition-fast);
}

tbody tr:hover {
    background-color: var(--bg-tertiary);
}

/* ============================================
   反馈循环卡片
   ============================================ */
.feedback-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-md) 0;
}

.feedback-card {
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-md);
}

.feedback-card.positive {
    background: linear-gradient(135deg, #d4fc79 0%, #96e6a1 100%);
    border-left: 4px solid var(--color-success);
}

[data-theme="dark"] .feedback-card.positive {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.2) 0%, rgba(5, 150, 105, 0.2) 100%);
}

.feedback-card.negative {
    background: linear-gradient(135deg, #ffeaa7 0%, #fdcb6e 100%);
    border-left: 4px solid var(--color-warning);
}

[data-theme="dark"] .feedback-card.negative {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.2) 0%, rgba(217, 119, 6, 0.2) 100%);
}

.feedback-card h4 {
    margin-bottom: var(--spacing-sm);
}

.feedback-card ol {
    margin-left: var(--spacing-md);
}

/* ============================================
   杀手部分
   ============================================ */
.killer-section {
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-md);
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius-md);
    border-left: 4px solid var(--color-danger);
}

.example-box,
.reality-box {
    background-color: var(--bg-tertiary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-sm);
    margin: var(--spacing-sm) 0;
}

/* ============================================
   思维模式对比
   ============================================ */
.mindset-comparison,
.control-comparison {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-md) 0;
}

.mindset-card,
.control-card {
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
}

.mindset-card.fixed {
    background: linear-gradient(135deg, #ffeaa7 0%, #fdcb6e 100%);
}

[data-theme="dark"] .mindset-card.fixed {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.2) 0%, rgba(217, 119, 6, 0.2) 100%);
}

.mindset-card.growth {
    background: linear-gradient(135deg, #d4fc79 0%, #96e6a1 100%);
}

[data-theme="dark"] .mindset-card.growth {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.2) 0%, rgba(5, 150, 105, 0.2) 100%);
}

.control-card {
    background-color: var(--bg-secondary);
    border-left: 3px solid var(--color-accent);
}

/* ============================================
   图表
   ============================================ */
.summary-diagram {
    background-color: var(--bg-secondary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    margin: var(--spacing-md) 0;
}

.diagram-code {
    background-color: var(--bg-tertiary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-sm);
    overflow-x: auto;
    font-family: 'Courier New', monospace;
    line-height: 1.6;
}

/* ============================================
   范围卡片
   ============================================ */
.scope-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-md) 0;
}

.scope-card {
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-md);
}

.scope-card.can {
    background: linear-gradient(135deg, #d4fc79 0%, #96e6a1 100%);
}

[data-theme="dark"] .scope-card.can {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.2) 0%, rgba(5, 150, 105, 0.2) 100%);
}

.scope-card.cannot {
    background: linear-gradient(135deg, #ffeaa7 0%, #fdcb6e 100%);
}

[data-theme="dark"] .scope-card.cannot {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.2) 0%, rgba(217, 119, 6, 0.2) 100%);
}

.warning-box {
    background-color: rgba(239, 68, 68, 0.1);
    border: 2px solid var(--color-danger);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    margin: var(--spacing-md) 0;
}

/* ============================================
   策略部分
   ============================================ */
.strategy-section {
    background-color: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    margin-bottom: var(--spacing-lg);
    border-left: 5px solid var(--color-accent);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.strategy-section:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.strategy-title {
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
    font-size: 1.4rem;
}

.strategy-content {
    padding-left: var(--spacing-md);
}

.example-comparison {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-md) 0;
}

.example-wrong,
.example-right {
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
}

.example-wrong {
    background-color: rgba(239, 68, 68, 0.1);
    border: 2px solid var(--color-danger);
}

.example-right {
    background-color: rgba(16, 185, 129, 0.1);
    border: 2px solid var(--color-success);
}

.tip-box,
.practice-box,
.reminder-box,
.dialogue-tip {
    background-color: var(--bg-tertiary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    margin: var(--spacing-md) 0;
    border-left: 4px solid var(--color-info);
}

.control-lists {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-md) 0;
}

.control-list {
    background-color: var(--bg-tertiary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
}

.control-list h5 {
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
}

.wrong-response {
    color: var(--color-danger);
    font-weight: 600;
}

.right-response {
    color: var(--color-success);
    font-weight: 600;
}

/* ============================================
   归因测试
   ============================================ */
.attribution-test {
    background-color: var(--bg-secondary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    margin: var(--spacing-md) 0;
}

.attribution-options {
    list-style: none;
    margin-left: 0;
}

.attribution-options li {
    padding: var(--spacing-sm) var(--spacing-md);
    margin-bottom: var(--spacing-xs);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.attribution-options li.worst {
    background-color: rgba(239, 68, 68, 0.1);
    border-left: 4px solid var(--color-danger);
}

.attribution-options li.bad {
    background-color: rgba(245, 158, 11, 0.1);
    border-left: 4px solid var(--color-warning);
}

.attribution-options li.mediocre {
    background-color: rgba(59, 130, 246, 0.1);
    border-left: 4px solid var(--color-info);
}

.attribution-options li.best {
    background-color: rgba(16, 185, 129, 0.1);
    border-left: 4px solid var(--color-success);
}

.attribution-options li:hover {
    transform: translateX(5px);
}

.why-best {
    background-color: var(--bg-tertiary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-sm);
    margin-top: var(--spacing-md);
}

/* ============================================
   支持系统
   ============================================ */
.support-levels {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-md) 0;
}

.support-card {
    background-color: var(--bg-tertiary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    border-top: 4px solid var(--color-accent);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.support-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.support-card h5 {
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
}

/* ============================================
   总结部分
   ============================================ */
.summary-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-md) 0;
}

.summary-card {
    background-color: var(--bg-secondary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
}

.strategy-list {
    list-style: none;
    margin-left: 0;
}

.strategy-list li {
    padding: var(--spacing-xs) 0;
}

.metaphor-box {
    background: var(--gradient-primary);
    color: white;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    margin: var(--spacing-md) 0;
    box-shadow: var(--shadow-lg);
}

.metaphor-box h3,
.metaphor-box p,
.metaphor-box ul,
.metaphor-box li {
    color: white;
}

.final-words {
    background-color: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    margin: var(--spacing-md) 0;
}

.encouragement-list {
    list-style: none;
    margin-left: 0;
}

.encouragement-list li {
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    background-color: var(--bg-tertiary);
    border-radius: var(--border-radius-sm);
    border-left: 4px solid var(--color-success);
}

.final-emphasis {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-accent);
    text-align: center;
    padding: var(--spacing-md);
}

.motto {
    font-size: 1.1rem;
    font-weight: 600;
    text-align: center;
    padding: var(--spacing-md);
    background: var(--gradient-primary);
    color: white;
    border-radius: var(--border-radius-md);
}

/* ============================================
   互动部分
   ============================================ */
.interaction-questions ol {
    background-color: var(--bg-secondary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
}

.check-in-section {
    background-color: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    margin: var(--spacing-md) 0;
}

.check-in-tool {
    background-color: var(--bg-tertiary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    margin-top: var(--spacing-md);
}

.check-in-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.check-in-form label {
    font-weight: 600;
    color: var(--text-primary);
}

.check-in-form input,
.check-in-form textarea {
    padding: var(--spacing-sm);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: inherit;
    transition: all var(--transition-fast);
}

.check-in-form input:focus,
.check-in-form textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.check-in-form textarea {
    resize: vertical;
    min-height: 80px;
}

.btn-submit {
    background: var(--gradient-primary);
    color: white;
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-md);
    cursor: pointer;
    font-weight: 600;
    font-size: 1rem;
    transition: all var(--transition-base);
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.check-in-history {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 2px solid var(--border-color);
}

.check-in-history h5 {
    margin-bottom: var(--spacing-sm);
}

#checkInList {
    list-style: none;
    margin-left: 0;
}

#checkInList li {
    background-color: var(--bg-primary);
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    border-radius: var(--border-radius-sm);
    border-left: 4px solid var(--color-success);
}

/* ============================================
   评论区
   ============================================ */
.comment-section {
    background-color: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    margin: var(--spacing-md) 0;
}

.comment-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.comment-form input {
    padding: var(--spacing-sm);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: inherit;
}

.comment-list {
    max-height: 500px;
    overflow-y: auto;
}

.comment-item {
    background-color: var(--bg-tertiary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    margin-bottom: var(--spacing-sm);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.comment-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-xs);
}

.comment-name {
    font-weight: 600;
    color: var(--color-accent);
}

.comment-time {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.comment-content {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ============================================
   帮助资源
   ============================================ */
.help-resources {
    background-color: rgba(239, 68, 68, 0.1);
    border: 2px solid var(--color-danger);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    margin: var(--spacing-md) 0;
}

.help-resources h3 {
    color: var(--color-danger);
    margin-bottom: var(--spacing-sm);
}

/* ============================================
   结束语
   ============================================ */
.closing-message {
    text-align: center;
    padding: var(--spacing-xl);
    background: var(--gradient-primary);
    color: white;
    border-radius: var(--border-radius-lg);
    margin-top: var(--spacing-xl);
}

.closing-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.share-reminder {
    background-color: rgba(255, 255, 255, 0.2);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    backdrop-filter: blur(10px);
}

.share-reminder p,
.share-reminder ul,
.share-reminder li {
    color: white;
}

.share-message {
    font-weight: 600;
    font-size: 1.1rem;
    margin-top: var(--spacing-sm);
}

/* ============================================
   返回顶部按钮
   ============================================ */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-lg);
    z-index: 998;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

/* ============================================
   分享弹窗
   ============================================ */
.modal {
    display: none;
    position: fixed;
    z-index: 10000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
}

.modal.active {
    display: flex;
    justify-content: center;
    align-items: center;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.modal-content {
    background-color: var(--bg-primary);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    max-width: 500px;
    width: 90%;
    position: relative;
    box-shadow: var(--shadow-xl);
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.close {
    position: absolute;
    top: 10px;
    right: 20px;
    font-size: 2rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: color var(--transition-fast);
}

.close:hover {
    color: var(--color-danger);
}

.modal-content h3 {
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.share-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
}

.share-btn {
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border-radius: var(--border-radius-md);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: all var(--transition-base);
}

.share-btn:hover {
    background-color: var(--bg-tertiary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ============================================
   响应式设计
   ============================================ */
@media (min-width: 1024px) {
    .sidebar.active ~ .main-content {
        margin-left: 280px;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
    
    .article-title {
        font-size: 1.8rem;
    }
    
    .article-subtitle {
        font-size: 1rem;
    }
    
    .article-meta {
        flex-direction: column;
        gap: var(--spacing-xs);
    }
    
    .content-section h2 {
        font-size: 1.5rem;
    }
    
    .feedback-container,
    .mindset-comparison,
    .scope-container,
    .example-comparison,
    .control-lists,
    .support-levels,
    .summary-container {
        grid-template-columns: 1fr;
    }
    
    table {
        font-size: 0.85rem;
    }
    
    th, td {
        padding: var(--spacing-xs);
    }
    
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }
}

@media (max-width: 480px) {
    .main-content {
        padding: var(--spacing-md) var(--spacing-sm);
    }
    
    .content-section {
        padding: var(--spacing-md);
    }
    
    .article-header {
        padding: var(--spacing-md);
    }
    
    .share-buttons {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   打印样式
   ============================================ */
@media print {
    .navbar,
    .sidebar,
    .back-to-top,
    .progress-bar,
    .article-actions,
    .check-in-tool,
    .comment-section,
    .share-reminder {
        display: none !important;
    }
    
    .main-content {
        max-width: 100%;
        padding: 0;
    }
    
    .content-section {
        page-break-inside: avoid;
    }
}

/* ============================================
   滚动条美化
   ============================================ */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--color-accent);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-accent-dark);
}

/* ============================================
   文本选择样式
   ============================================ */
::selection {
    background-color: var(--color-accent-light);
    color: white;
}

::-moz-selection {
    background-color: var(--color-accent-light);
    color: white;
}