/* =========================================
   全局重置与变量
   ========================================= */
:root {
  --color-primary: #FCD535;
  --color-primary-hover: #F0C724;
  --color-bg-main: #FFFFFF;
  --color-bg-sec: #FAFAFA;
  --color-text-main: #1E2329;
  --color-text-muted: #474D57;
  --color-border: #EAECEF;
  --color-success: #0ECB81;
  --color-danger: #F6465D;
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.12);
  --radius-md: 12px;
  --radius-lg: 24px;
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

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

body {
  font-family: var(--font-main);
  color: var(--color-text-main);
  background-color: var(--color-bg-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.2s ease, background-color 0.2s ease;
}

ul, ol {
  list-style: none;
}

/* =========================================
   布局与通用组件
   ========================================= */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 文章双栏布局 (内容 + TOC) */
.layout-wrapper {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 60px;
  align-items: start;
}

.main-content {
  min-width: 0; /* 防止网格溢出 */
}

.sidebar-toc {
  position: sticky;
  top: 100px;
  background: var(--color-bg-main);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  max-height: calc(100vh - 140px);
  overflow-y: auto;
}

.toc-title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.toc-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.toc-link {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.4;
  display: block;
  padding-left: 12px;
  border-left: 2px solid transparent;
  transition: all 0.2s ease;
}

.toc-link:hover {
  color: var(--color-text-main);
}

.toc-link.active {
  color: var(--color-primary-hover);
  border-left-color: var(--color-primary-hover);
  font-weight: 600;
}

/* 富文本排版 (长文 SEO 优化) */
.article-body h2 {
  font-size: 2rem;
  font-weight: 800;
  margin: 60px 0 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-main);
  scroll-margin-top: 100px;
}

.article-body h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 40px 0 16px;
  color: var(--color-text-main);
  scroll-margin-top: 100px;
}

.article-body h4 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 24px 0 12px;
}

.article-body p {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--color-text-muted);
  margin-bottom: 20px;
  text-align: justify;
}

.article-body strong {
  color: var(--color-text-main);
  font-weight: 600;
}

.article-body ul, .article-body ol {
  margin-bottom: 24px;
  padding-left: 24px;
}

.article-body li {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--color-text-muted);
  margin-bottom: 12px;
}

.article-body li::marker {
  color: var(--color-primary-hover);
  font-weight: bold;
}

.article-body blockquote {
  border-left: 4px solid var(--color-primary);
  background: var(--color-bg-sec);
  padding: 20px 24px;
  margin: 32px 0;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-style: italic;
  color: var(--color-text-main);
}

.article-body blockquote p {
  margin-bottom: 0;
  color: inherit;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 1rem;
  color: var(--color-text-main);
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 1.125rem;
  margin-bottom: 4rem;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.text-left { text-align: left !important; }
.text-center { text-align: center !important; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
  gap: 8px;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #1E2329;
}

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

.btn-outline {
  background-color: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text-main);
}

.btn-outline:hover {
  border-color: var(--color-text-main);
  background-color: var(--color-bg-sec);
}

.btn-block {
  display: flex;
  width: 100%;
  margin-top: 20px;
}

/* SVG 图标通用样式 */
.icon {
  width: 24px;
  height: 24px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.icon-lg {
  width: 40px;
  height: 40px;
  stroke-width: 1.5;
  color: var(--color-primary-hover);
}

/* =========================================
   头部导航
   ========================================= */
.header {
  position: sticky;
  top: 0;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.logo {
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: monospace;
}

.logo-icon {
  width: 24px;
  height: 24px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo-icon svg {
  width: 20px;
  height: 20px;
  stroke: #1E2329;
}

.nav-container {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links {
  display: flex;
  gap: 32px;
  align-items: center;
}

.nav-links a {
  font-weight: 500;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.nav-links a:hover {
  color: var(--color-text-main);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-main);
  padding: 8px;
}

/* 多语种选择器 */
.lang-selector {
  position: relative;
}

.lang-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  border: none;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 8px;
  border-radius: 6px;
  transition: background 0.2s;
}

.lang-btn:hover {
  color: var(--color-text-main);
  background: var(--color-bg-sec);
}

.lang-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 8px;
  background: var(--color-bg-main);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  box-shadow: var(--shadow-md);
  min-width: 140px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all 0.2s ease;
  z-index: 101;
  max-height: calc(100vh - 120px);
    overflow-y: auto;
}

.lang-dropdown.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.lang-option {
  display: block;
  padding: 3px 9px;
  font-size: 0.7rem;
  color: var(--color-text-main);
}

.lang-option:hover {
  background-color: var(--color-bg-sec);
}

.lang-option.active {
  color: var(--color-primary-hover);
  font-weight: 600;
  background-color: rgba(252, 213, 53, 0.1);
}

/* =========================================
   主屏 (Hero)
   ========================================= */
.hero {
  padding: 80px 0 100px;
  overflow: hidden;
  background: linear-gradient(180deg, #FFFFFF 0%, #F8F9FA 100%);
}

.hero-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 60px;
}

.hero-content {
  flex: 1;
  max-width: 580px;
}

.hero-tag {
  display: inline-block;
  padding: 6px 12px;
  background: rgba(252, 213, 53, 0.2);
  color: #B8860B;
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 24px;
  letter-spacing: -1px;
}

.hero-desc {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  margin-bottom: 40px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
}

/* 主屏右侧：CSS 绘制的 UI 卡片集合 */
.hero-visual {
  flex: 1;
  position: relative;
  height: 500px;
  display: flex;
  justify-content: center;
  align-items: center;
  perspective: 1000px;
}

.ui-dashboard {
  position: relative;
  width: 100%;
  max-width: 460px;
  height: 100%;
}

/* 浮动动画 */
@keyframes float-slow {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-15px); }
}
@keyframes float-fast {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-20px); }
}

.ui-card {
  position: absolute;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(234, 236, 239, 0.8);
  border-radius: 20px;
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.08);
  padding: 24px;
}

/* 主资产卡片 */
.ui-main-card {
  top: 15%;
  left: 5%;
  width: 90%;
  z-index: 2;
  animation: float-slow 6s ease-in-out infinite;
}

.ui-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.ui-balance {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 8px;
  letter-spacing: -1px;
}

.ui-profit {
  color: var(--color-success);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 4px;
  background: rgba(14, 203, 129, 0.1);
  padding: 4px 8px;
  border-radius: 4px;
  display: inline-flex;
}

/* CSS 绘制的简易折线图 */
.ui-chart-sparkline {
  margin-top: 24px;
  height: 60px;
  width: 100%;
  display: flex;
  align-items: flex-end;
  gap: 4px;
}

.spark-bar {
  flex: 1;
  background: var(--color-primary);
  border-radius: 4px 4px 0 0;
  opacity: 0.8;
}

/* 浮动行情卡片 1 */
.ui-market-card-1 {
  bottom: 10%;
  left: -10%;
  width: 200px;
  z-index: 3;
  animation: float-fast 5s ease-in-out infinite 1s;
}

/* 浮动行情卡片 2 */
.ui-market-card-2 {
  top: 5%;
  right: -5%;
  width: 200px;
  z-index: 1;
  animation: float-fast 7s ease-in-out infinite 0.5s;
}

.market-pair {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.coin-icon {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  color: white;
}
.coin-btc { background: #F7931A; }
.coin-eth { background: #627EEA; }

.market-price {
  font-size: 1.25rem;
  font-weight: 700;
}

/* =========================================
   生态板块 (Ecosystem)
   ========================================= */
.section {
  padding: 100px 0;
}

.bg-light {
  background-color: var(--color-bg-sec);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feature-card {
  background: var(--color-bg-main);
  padding: 40px 32px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  transition: box-shadow 0.3s ease, transform 0.3s ease;
  height: 100%;
}

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

.feature-icon-wrapper {
  width: 64px;
  height: 64px;
  background: rgba(252, 213, 53, 0.1);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.feature-desc {
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* =========================================
   安全板块 (Security)
   ========================================= */
.security-content {
  display: flex;
  align-items: center;
  gap: 60px;
}

.security-text {
  flex: 1;
}

.security-list {
  margin-top: 32px;
}

.security-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 32px;
}

.security-item-icon {
  color: var(--color-success);
  flex-shrink: 0;
  margin-top: 2px;
}

.security-item-title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.security-item-desc {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* CSS 绘制的安全插画 */
.security-visual {
  flex: 1;
  background: linear-gradient(135deg, #FAFAFA 0%, #F0F1F2 100%);
  border-radius: var(--radius-lg);
  padding: 60px;
  display: flex;
  justify-content: center;
  align-items: center;
  border: 1px solid var(--color-border);
  min-height: 400px;
  position: relative;
  overflow: hidden;
}

/* CSS 盾牌绘制 */
.css-shield {
  width: 160px;
  height: 190px;
  background: linear-gradient(135deg, var(--color-primary), #F0B90B);
  border-radius: 12px 12px 80px 80px;
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow: 0 20px 40px rgba(240, 185, 11, 0.3);
  z-index: 2;
}

.css-shield::before {
  content: '';
  position: absolute;
  width: 140px;
  height: 170px;
  background: linear-gradient(135deg, rgba(255,255,255,0.2), transparent);
  border-radius: 10px 10px 70px 70px;
}

.css-shield-check {
  width: 60px;
  height: 30px;
  border-bottom: 8px solid white;
  border-left: 8px solid white;
  transform: rotate(-45deg) translateY(-10px);
  z-index: 3;
}

/* 背景装饰环 */
.security-ring {
  position: absolute;
  width: 300px;
  height: 300px;
  border: 2px dashed rgba(0,0,0,0.05);
  border-radius: 50%;
  animation: rotate 20s linear infinite;
}

.security-ring-2 {
  width: 400px;
  height: 400px;
  border: 1px solid rgba(0,0,0,0.03);
  animation: rotate 30s linear infinite reverse;
}

@keyframes rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* =========================================
   深度评测 (Review)
   ========================================= */
.review-container {
  display: flex;
  flex-direction: column;
  gap: 60px;
}

/* CSS 绘制的评测数据图表 */
.review-illustration {
  background: var(--color-bg-sec);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 20px;
}

.css-bar-chart {
  display: flex;
  align-items: flex-end;
  gap: 20px;
  height: 200px;
  width: 100%;
  max-width: 600px;
  padding: 0 20px;
  border-bottom: 2px solid var(--color-border);
  position: relative;
}

.css-bar-group {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.css-bar-fill {
  width: 100%;
  max-width: 60px;
  background: var(--color-primary);
  border-radius: 8px 8px 0 0;
  transition: height 1s ease;
  position: relative;
}

.css-bar-fill::after {
  content: attr(data-value);
  position: absolute;
  top: -25px;
  left: 50%;
  transform: translateX(-50%);
  font-weight: 600;
  font-size: 0.875rem;
}

.css-bar-label {
  font-weight: 500;
  color: var(--color-text-muted);
  margin-top: 10px;
}

.review-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.review-box {
  padding: 40px;
  border-radius: var(--radius-md);
  background: var(--color-bg-main);
  border: 1px solid var(--color-border);
}

.review-box h3 {
  font-size: 1.5rem;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.review-box p {
  color: var(--color-text-muted);
  margin-bottom: 16px;
  line-height: 1.7;
}

/* 费率对比表格 (SEO 友好) */
.comparison-table-wrapper {
  width: 100%;
  overflow-x: auto;
  margin-top: 40px;
  background: var(--color-bg-main);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.comparison-table th,
.comparison-table td {
  padding: 20px 24px;
  border-bottom: 1px solid var(--color-border);
}

.comparison-table th {
  background-color: var(--color-bg-sec);
  font-weight: 600;
  color: var(--color-text-main);
}

.comparison-table tr:last-child td {
  border-bottom: none;
}

.highlight-col {
  background-color: rgba(252, 213, 53, 0.05);
  font-weight: 600;
  color: var(--color-text-main);
}

/* =========================================
   注册指南 (Guide)
   ========================================= */
.guide-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.step-card {
  background: var(--color-bg-main);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  position: relative;
}

.step-number {
  width: 40px;
  height: 40px;
  background: var(--color-text-main);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.step-card h3 {
  font-size: 1.125rem;
  margin-bottom: 12px;
}

.step-card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

/* =========================================
   常见问题 (FAQ)
   ========================================= */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--color-border);
  padding: 24px 0;
}

.faq-question {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: color 0.2s;
}

.faq-question:hover {
  color: var(--color-primary-hover);
}

.toggle-icon {
  font-size: 1.5rem;
  font-weight: 300;
  color: var(--color-text-muted);
  transition: transform 0.3s ease;
}

.faq-answer {
  color: var(--color-text-muted);
  font-size: 1rem;
  line-height: 1.7;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, margin-top 0.3s ease, opacity 0.3s ease;
  opacity: 0;
}

.faq-item.active .faq-answer {
  max-height: 500px;
  margin-top: 16px;
  opacity: 1;
}

.faq-item.active .toggle-icon {
  transform: rotate(45deg);
}

/* =========================================
   页脚 (Footer)
   ========================================= */
.footer {
  background-color: var(--color-bg-sec);
  padding: 80px 0 24px;
  border-top: 1px solid var(--color-border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 60px;
  margin-bottom: 60px;
}

.footer-brand p {
  color: var(--color-text-muted);
  margin-top: 16px;
  max-width: 400px;
  line-height: 1.7;
}

.footer-title {
  font-weight: 600;
  margin-bottom: 24px;
  font-size: 1.125rem;
}

.footer-links li {
  margin-bottom: 16px;
}

.footer-links a {
  color: var(--color-text-muted);
}

.footer-links a:hover {
  color: var(--color-text-main);
  text-decoration: underline;
}

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.disclaimer {
  font-size: 0.75rem;
  color: #848E9C;
  margin-top: 24px;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.6;
  text-align: justify;
}

/* =========================================
   响应式设计 (Media Queries)
   ========================================= */
@media (max-width: 1024px) {
  .layout-wrapper {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .sidebar-toc {
    display: none; /* 移动端隐藏侧边目录，保持阅读沉浸感 */
  }

  .hero-inner, .security-content {
    flex-direction: column;
    text-align: center;
  }
  
  .hero-content {
    max-width: 100%;
  }
  
  .hero-title {
    font-size: 3rem;
  }
  
  .hero-actions {
    justify-content: center;
  }
  
  .hero-visual {
    width: 100%;
    height: 450px;
    margin-top: 40px;
  }
  
  .security-text {
    text-align: left;
  }
  
  .grid-3, .review-grid {
    grid-template-columns: 1fr 1fr;
  }
  
  .guide-steps {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  /* 移动端导航栏折叠菜单 */
  .nav-container {
    position: absolute;
    top: 80px;
    left: 0;
    width: 100%;
    background: var(--color-bg-main);
    flex-direction: column;
    align-items: flex-start;
    padding: 0;
    box-shadow: 0 10px 20px rgba(0,0,0,0.05);
    border-bottom: 1px solid var(--color-border);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    gap: 0;
  }

  .nav-container.active {
    max-height: 500px;
  }

  .nav-links {
    flex-direction: column;
    width: 100%;
    align-items: flex-start;
    gap: 0;
  }

  .nav-links a {
    display: block;
    width: 100%;
    padding: 16px 24px;
    border-bottom: 1px solid var(--color-border);
  }

  .header-actions {
    width: 100%;
    padding: 16px 24px;
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .mobile-menu-btn {
    display: block;
  }

  .lang-dropdown {
    left: 0;
    right: auto;
  }

  /* 其他板块移动端适配 */
  .section {
    padding: 60px 0;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .grid-3, .review-grid, .guide-steps {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .ui-market-card-1, .ui-market-card-2 {
    display: none; /* 移动端隐藏浮动小卡片，保持主卡片清晰 */
  }

  .css-bar-chart {
    height: 150px;
    padding: 0;
  }
}

/* =========================================
   SEO 增强组件 (作者、优缺点、计算器、Mockup)
   ========================================= */

/* 作者背书框 */
.author-box {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px;
  background: var(--color-bg-sec);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--color-primary);
  margin-bottom: 32px;
}
.author-avatar {
  width: 48px;
  height: 48px;
  background: #EAECEF;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
}
.author-name {
  font-weight: 700;
  color: var(--color-text-main);
  margin-bottom: 4px;
}
.author-bio {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* 优缺点对比面板 */
.pros-cons-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 40px;
}
.pros-box, .cons-box {
  padding: 24px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}
.pros-box {
  background: rgba(14, 203, 129, 0.03);
  border-top: 4px solid var(--color-success);
}
.cons-box {
  background: rgba(246, 70, 93, 0.03);
  border-top: 4px solid var(--color-danger);
}
.pc-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 16px;
  margin-top: 0 !important;
}
.pros-box ul, .cons-box ul {
  padding-left: 0 !important;
  margin-bottom: 0 !important;
}
.pros-box li, .cons-box li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 12px;
  font-size: 0.95rem;
  line-height: 1.6;
}
.pros-box li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-success);
  font-weight: bold;
}
.cons-box li::before {
  content: '✕';
  position: absolute;
  left: 0;
  color: var(--color-danger);
  font-weight: bold;
}

/* 交互式计算器 */
.calculator-widget {
  background: var(--color-bg-main);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px;
  margin: 32px 0;
  box-shadow: var(--shadow-sm);
}
.calc-title {
  margin-top: 0 !important;
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.calc-desc {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-bottom: 24px;
}
.calc-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 24px;
}
.calc-input-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.calc-input-group label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text-main);
}
.calc-input-group input, .calc-input-group select {
  padding: 12px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 1rem;
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s;
}
.calc-input-group input:focus, .calc-input-group select:focus {
  border-color: var(--color-primary);
}
.calc-results {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  background: var(--color-bg-sec);
  padding: 20px;
  border-radius: 8px;
  margin-bottom: 16px;
}
.calc-result-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.result-label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}
.result-value {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-text-main);
}
.calc-result-item.highlight .result-value {
  color: var(--color-success);
}
.calc-result-item.savings .result-value {
  color: #F7931A;
}
.calc-note {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  text-align: right;
}

/* CSS 模拟 UI 窗口 */
.step-visual-box {
  margin: 24px 0;
  display: flex;
  justify-content: center;
}
.css-mockup-window {
  width: 100%;
  max-width: 400px;
  background: var(--color-bg-main);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  box-shadow: var(--shadow-md);
  overflow: hidden;
}
.mockup-header {
  background: var(--color-bg-sec);
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 6px;
  position: relative;
}
.mockup-header .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.mockup-header .dot.red { background: #FF5F56; }
.mockup-header .dot.yellow { background: #FFBD2E; }
.mockup-header .dot.green { background: #27C93F; }
.mockup-title {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-muted);
}
.mockup-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.mockup-input {
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  background: var(--color-bg-sec);
}
.mockup-input.highlight-input {
  border-color: var(--color-success);
  background: rgba(14, 203, 129, 0.05);
  color: var(--color-text-main);
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.mockup-btn {
  background: var(--color-primary);
  color: #1E2329;
  text-align: center;
  padding: 12px;
  border-radius: 8px;
  font-weight: 700;
  margin-top: 8px;
}

@media (max-width: 768px) {
  .pros-cons-grid, .calc-controls, .calc-results {
    grid-template-columns: 1fr;
  }
}