/*
 * 鲲鹏天工智能体网站主样式表
 * 2.0.0版本 - 增强科技视觉效果
 */

/* ============ 基础设置 ============ */

:root {
  /* 品牌主色 - 更新为更鲜明的配色 */
  --primary-color: #2b5aff;
  --primary-light: #4a74ff;
  --primary-dark: #0036d9;
  
  /* 辅助色 - 增加紫色调增强科技感 */
  --secondary-color: #00d9a7;
  --accent-color: #7928ca;
  --neon-color: #00f6ff;
  --highlight-color: #ff2d9a;
  
  /* 中性色 */
  --text-dark: #111827;
  --text-medium: #4f5a68;
  --text-light: #8b95a5;
  --bg-light: #f7f9ff;
  --bg-medium: #eef2fa;
  --bg-dark: #121826;
  --border-color: #e5e7eb;
  
  /* 功能色 */
  --success-color: #00e39c;
  --warning-color: #ffb020;
  --error-color: #ff4757;
  --info-color: #3361ff;
  
  /* 渐变 */
  --gradient-primary: linear-gradient(135deg, #2b5aff 0%, #7928ca 100%);
  --gradient-secondary: linear-gradient(135deg, #00d9a7 0%, #00f6ff 100%);
  --gradient-accent: linear-gradient(135deg, #7928ca 0%, #ff2d9a 100%);
  --gradient-dark: linear-gradient(135deg, #121826 0%, #2a3553 100%);
  
  /* 字体系统 */
  --font-sans: 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
  --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  
  /* 尺寸变量 */
  --header-height: 72px;
  --container-width: 1200px;
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 12px;
  --border-radius-xl: 24px;
  
  /* 间距系统 */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-xxl: 48px;
  
  /* 阴影 - 增强立体感 */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 8px 20px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.16);
  --shadow-neon: 0 0 15px rgba(0, 246, 255, 0.5);
  --shadow-highlight: 0 0 15px rgba(255, 45, 154, 0.5);
  
  /* 过渡 */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  --transition-bounce: 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-dark);
  background-color: #fff;
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: all var(--transition-fast);
}

a:hover {
  color: var(--primary-light);
}

ul, ol {
  list-style: none;
}

/* 容器 */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* 通用按钮样式 - 增强视觉效果 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: var(--border-radius-md);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: center;
  position: relative;
  overflow: hidden;
  z-index: 1;
}

/* 主按钮 - 添加渐变和发光效果 */
.btn-primary {
  background: var(--gradient-primary);
  color: white;
  border: none;
  box-shadow: 0 4px 14px rgba(43, 90, 255, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(43, 90, 255, 0.6);
  color: white;
}

.btn-primary:active {
  transform: translateY(1px);
}

.btn-outline {
  background-color: transparent;
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
  transition: all var(--transition-normal);
}

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

.btn-text {
  background-color: transparent;
  color: var(--primary-color);
  padding: 0.5rem;
  display: inline-flex;
  align-items: center;
}

.btn-text i {
  margin-left: 0.25rem;
  transition: transform var(--transition-fast);
}

.btn-text:hover i {
  transform: translateX(4px);
}

.btn-large {
  padding: 1rem 2rem;
  font-size: 1.1rem;
}

/* 带霓虹效果的按钮 */
.btn-neon {
  background-color: transparent;
  color: var(--neon-color);
  border: 2px solid var(--neon-color);
  box-shadow: var(--shadow-neon);
}

.btn-neon:hover {
  background-color: rgba(0, 246, 255, 0.1);
  box-shadow: 0 0 20px rgba(0, 246, 255, 0.8);
  transform: translateY(-2px);
  color: white;
}

/* 章节标题样式 */
.section-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  position: relative;
}

.section-title {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--text-dark);
  position: relative;
  display: inline-block;
}

/* 标题下划线效果 */
.section-title:after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  width: 80px;
  height: 3px;
  background: var(--gradient-primary);
  transform: translateX(-50%);
  border-radius: 3px;
}

.section-subtitle {
  font-size: 1.25rem;
  color: var(--text-medium);
  max-width: 700px;
  margin: 18px auto 0;
}

.section-action {
  text-align: center;
  margin-top: var(--spacing-xl);
}

/* ============ 头部区域 ============ */

.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background-color: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  z-index: 1000;
  transition: all var(--transition-normal);
}

.header.scrolled {
  background-color: rgba(255, 255, 255, 0.96);
  box-shadow: var(--shadow-md);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

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

.logo a {
  display: flex;
  align-items: center;
  color: var(--text-dark);
  font-weight: 700;
  font-size: 1.5rem;
}

.logo img {
  height: 36px;
  margin-right: var(--spacing-sm);
}

/* 导航菜单样式增强 */
.nav-links {
  display: flex;
  align-items: center;
}

.nav-link {
  margin: 0 var(--spacing-md);
  color: var(--text-medium);
  font-weight: 500;
  position: relative;
}

.nav-link:after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary-color);
}

.nav-link:hover:after,
.nav-link.active:after {
  width: 100%;
}

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

.header-actions .btn {
  margin-left: var(--spacing-sm);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  width: 30px;
  cursor: pointer;
}

.menu-toggle span {
  height: 2px;
  width: 100%;
  background-color: var(--text-dark);
  margin: 3px 0;
  transition: var(--transition-fast);
}

/* ============ 英雄区 - 增强视觉效果 ============ */

.hero-section {
  padding: calc(var(--header-height) + 60px) 0 80px;
  position: relative;
  overflow: hidden;
  background-color: var(--bg-light);
}

.hero-content {
  display: flex;
  align-items: center;
  position: relative;
  z-index: 2;
}

.hero-text {
  flex: 0 0 55%;
}

.hero-visual {
  flex: 0 0 45%;
  position: relative;
}

/* 增强标题字号和视觉效果 */
.hero-title {
  font-family: var(--font-heading);
  font-size: 3.75rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--text-dark);
}

.text-highlight {
  color: transparent;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  position: relative;
}

/* 文字下的闪光效果 */
.text-highlight:before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.5), transparent);
  background-size: 200% 100%;
  animation: shimmer 3s infinite;
  z-index: -1;
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-medium);
  margin-bottom: var(--spacing-xl);
  max-width: 600px;
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-md);
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1;
}

.hero-shape-1 {
  position: absolute;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 217, 167, 0.2) 0%, rgba(0, 217, 167, 0) 70%);
  top: -150px;
  right: -200px;
  animation: floating 15s infinite alternate ease-in-out;
}

.hero-shape-2 {
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(121, 40, 202, 0.15) 0%, rgba(121, 40, 202, 0) 70%);
  bottom: -200px;
  left: -200px;
  animation: floating 20s infinite alternate-reverse ease-in-out;
}

.hero-shape-3 {
  position: absolute;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(43, 90, 255, 0.15) 0%, rgba(43, 90, 255, 0) 70%);
  top: 100px;
  right: 30%;
  animation: floating 12s infinite alternate ease-in-out;
}

@keyframes floating {
  0% { transform: translate(0, 0) rotate(0deg); }
  100% { transform: translate(20px, 20px) rotate(10deg); }
}

.grid-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: linear-gradient(var(--bg-medium) 1px, transparent 1px),
                   linear-gradient(90deg, var(--bg-medium) 1px, transparent 1px);
  background-size: 30px 30px;
  opacity: 0.3;
  z-index: 0;
}

/* 核心价值卡片样式 */
.value-section {
  padding: var(--spacing-xxl) 0;
  background-color: white;
  position: relative;
}

.value-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

.value-card {
  background-color: white;
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.value-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.value-card:after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--gradient-primary);
  z-index: -1;
}

.value-icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-light);
  border-radius: 50%;
  margin-bottom: var(--spacing-md);
}

.value-icon i {
  font-size: 2rem;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.value-card h3 {
  font-size: 1.75rem;
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
}

.value-card p {
  color: var(--text-medium);
  margin-bottom: var(--spacing-md);
}

.value-points {
  margin-top: var(--spacing-md);
}

.value-points li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: var(--spacing-sm);
  color: var(--text-medium);
}

.value-points li:before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.5rem;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gradient-primary);
}

/* 企业核心竞争力区域样式 */
.competitive-edge-section {
  padding: var(--spacing-xxl) 0;
  background-color: var(--bg-light);
  position: relative;
}

.edge-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

.edge-card {
  background: linear-gradient(145deg, #ffffff, #f5f8fe);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  position: relative;
  overflow: hidden;
  z-index: 1;
  border-left: 4px solid transparent;
  border-image: var(--gradient-primary);
  border-image-slice: 1;
}

.edge-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.edge-icon {
  width: 72px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(43, 90, 255, 0.1);
  border-radius: 16px;
  margin-bottom: var(--spacing-md);
  position: relative;
}

.edge-icon:before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 16px;
  padding: 2px;
  background: var(--gradient-primary);
  -webkit-mask: 
     linear-gradient(#fff 0 0) content-box, 
     linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
}

.edge-icon i {
  font-size: 2.25rem;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.edge-card h3 {
  font-size: 1.75rem;
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
}

.edge-card p {
  color: var(--text-medium);
  margin-bottom: var(--spacing-md);
  line-height: 1.5;
}

.edge-points {
  margin-top: var(--spacing-md);
}

.edge-points li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: var(--spacing-sm);
  color: var(--text-medium);
}

.edge-points li:before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.5rem;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gradient-primary);
}

/* 产品模块标签页 */
.products-section {
  padding: var(--spacing-xxl) 0;
}

.product-tabs {
  margin-top: var(--spacing-xl);
}

.tab-headers {
  display: flex;
  justify-content: center;
  margin-bottom: var(--spacing-xl);
  position: relative;
}

.tab-btn {
  background: none;
  border: none;
  padding: 1rem 2rem;
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text-medium);
  cursor: pointer;
  position: relative;
  transition: all var(--transition-fast);
}

.tab-btn:after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 3px;
  background: transparent;
  transition: all var(--transition-fast);
  border-radius: 3px;
}

.tab-btn.active {
  color: var(--primary-color);
}

.tab-btn.active:after {
  background: var(--gradient-primary);
}

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

.tab-content {
  position: relative;
}

.tab-pane {
  display: none;
  animation: fadeIn var(--transition-normal);
}

.tab-pane.active {
  display: block;
}

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

/* 产品概览 */
.product-overview {
  display: flex;
  gap: var(--spacing-xl);
  align-items: center;
}

.product-image {
  flex: 0 0 45%;
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.product-info {
  flex: 0 0 55%;
}

.product-name {
  font-size: 2.25rem;
  margin-bottom: var(--spacing-sm);
}

.product-desc {
  color: var(--text-medium);
  font-size: 1.1rem;
  margin-bottom: var(--spacing-lg);
}

.feature-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.feature-item {
  display: flex;
  flex-direction: column;
  padding: var(--spacing-md);
  background-color: var(--bg-light);
  border-radius: var(--border-radius-md);
  transition: all var(--transition-fast);
}

.feature-item:hover {
  background-color: white;
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
}

.feature-item i {
  font-size: 1.5rem;
  color: var(--primary-color);
  margin-bottom: var(--spacing-sm);
}

.feature-item h4 {
  margin-bottom: var(--spacing-xs);
  font-size: 1.1rem;
}

.feature-item p {
  color: var(--text-medium);
  font-size: 0.95rem;
}

/* 应用场景区域 */
.scenarios-section {
  padding: var(--spacing-xxl) 0;
  background-color: var(--bg-light);
  position: relative;
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: var(--spacing-xl);
  gap: var(--spacing-md);
}

.filter-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin: 0 var(--spacing-md);
}

.filter-btn {
  background: none;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 30px;
  font-size: 0.9rem;
  color: var(--text-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn.active {
  background-color: var(--primary-color);
  color: white;
  box-shadow: 0 4px 8px rgba(43, 90, 255, 0.3);
}

.filter-btn:hover:not(.active) {
  color: var(--primary-color);
  background-color: rgba(43, 90, 255, 0.1);
}

.scenario-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

.scenario-card {
  background-color: white;
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
}

.scenario-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.scenario-icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-light);
  border-radius: var(--border-radius-md);
  margin-bottom: var(--spacing-md);
}

.scenario-icon i {
  font-size: 2rem;
  color: var(--primary-color);
}

.scenario-card h3 {
  margin-bottom: var(--spacing-sm);
  font-size: 1.5rem;
}

.scenario-card p {
  color: var(--text-medium);
  margin-bottom: var(--spacing-md);
  line-height: 1.5;
}

.scenario-benefits {
  display: flex;
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-md);
  gap: var(--spacing-md);
}

.benefit {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.benefit-value {
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--primary-color);
}

.benefit-label {
  font-size: 0.85rem;
  color: var(--text-light);
}

/* 客户案例样式 */
.cases-section {
  padding: var(--spacing-xxl) 0;
}

.case-carousel {
  position: relative;
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.carousel-controls {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.carousel-prev,
.carousel-next {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 2px solid var(--primary-color);
  background: none;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.carousel-prev i,
.carousel-next i {
  color: var(--primary-color);
  font-size: 1.25rem;
}

.carousel-prev:hover,
.carousel-next:hover {
  background-color: var(--primary-color);
}

.carousel-prev:hover i,
.carousel-next:hover i {
  color: white;
}

.logos-container {
  text-align: center;
  margin-top: var(--spacing-xl);
}

.logos-container h3 {
  color: var(--text-medium);
  font-weight: 500;
  margin-bottom: var(--spacing-lg);
}

.client-logos {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-lg);
}

.client-logo {
  width: 120px;
  height: 60px;
  background-color: var(--bg-medium);
  border-radius: var(--border-radius-sm);
}

/* 数据统计区 */
.stats-section {
  padding: var(--spacing-xl) 0;
  background: var(--gradient-primary);
  color: white;
}

.stats-row {
  display: flex;
  justify-content: space-around;
  text-align: center;
}

.stat-item {
  padding: var(--spacing-md);
}

.stat-value {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.stat-label {
  font-size: 1.1rem;
  opacity: 0.8;
}

/* FAQ部分样式 */
.faq-section {
  padding: var(--spacing-xxl) 0;
  background-color: var(--bg-light);
}

.faq-container {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background-color: white;
  border-radius: var(--border-radius-md);
  margin-bottom: var(--spacing-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg);
  cursor: pointer;
}

.faq-question h3 {
  font-size: 1.2rem;
  font-weight: 500;
}

.faq-toggle {
  background: none;
  border: none;
  font-size: 1.2rem;
  color: var(--primary-color);
  cursor: pointer;
  transition: transform var(--transition-fast);
}

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

.faq-answer {
  padding: 0 var(--spacing-lg);
  max-height: 0;
  overflow: hidden;
  transition: all var(--transition-normal);
}

.faq-item.active .faq-answer {
  padding: 0 var(--spacing-lg) var(--spacing-lg);
  max-height: 500px;
}

.faq-answer p {
  color: var(--text-medium);
}

/* 行动召唤区域 */
.cta-section {
  padding: var(--spacing-xxl) 0;
  position: relative;
  overflow: hidden;
  background-color: var(--bg-dark);
  color: white;
}

.cta-content {
  text-align: center;
  position: relative;
  z-index: 2;
}

.cta-content h2 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
}

.cta-content p {
  font-size: 1.2rem;
  max-width: 600px;
  margin: 0 auto var(--spacing-xl);
  opacity: 0.8;
}

.cta-buttons {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
}

.cta-buttons .btn-outline {
  border-color: white;
  color: white;
}

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

/* 页脚 */
.footer {
  padding: var(--spacing-xxl) 0 var(--spacing-lg);
  background-color: var(--bg-dark);
  color: white;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-xl);
}

.footer-col h3 {
  font-size: 1.2rem;
  margin-bottom: var(--spacing-lg);
  position: relative;
  padding-bottom: var(--spacing-sm);
}

.footer-col h3:after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 2px;
  background: var(--gradient-primary);
}

.footer-col p {
  margin-bottom: var(--spacing-lg);
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.5;
}

.footer-col ul li {
  margin-bottom: var(--spacing-sm);
}

.footer-col ul li a {
  color: rgba(255, 255, 255, 0.7);
  transition: all var(--transition-fast);
}

.footer-col ul li a:hover {
  color: white;
  padding-left: var(--spacing-xs);
}

.footer-social {
  display: flex;
  gap: var(--spacing-md);
}

.footer-social a {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.1);
  color: white;
  transition: all var(--transition-fast);
}

.footer-social a:hover {
  background: var(--primary-color);
  transform: translateY(-3px);
}

.contact-info li {
  display: flex;
  align-items: flex-start;
  margin-bottom: var(--spacing-md);
  color: rgba(255, 255, 255, 0.7);
}

.contact-info li i {
  margin-right: var(--spacing-sm);
  margin-top: 4px;
  color: var(--primary-color);
}

.footer-bottom {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.copyright {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.9rem;
}

.footer-links {
  display: flex;
  gap: var(--spacing-md);
}

.footer-links a {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: white;
}

/* 返回顶部按钮 */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--primary-color);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  opacity: 0;
  visibility: hidden;
  z-index: 99;
}

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

.back-to-top:hover {
  background: var(--primary-light);
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.back-to-top i {
  font-size: 1.25rem;
}

/* 交互式演示区域样式 */
.demo-container {
  margin-top: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  background-color: white;
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.demo-title {
  text-align: center;
  padding: var(--spacing-lg);
  background-color: var(--bg-light);
  font-size: 1.5rem;
  margin: 0;
}

.demo-tabs {
  display: flex;
  background-color: white;
  border-bottom: 1px solid var(--border-color);
}

.demo-tab {
  padding: var(--spacing-md) var(--spacing-lg);
  background: none;
  border: none;
  font-weight: 500;
  color: var(--text-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
}

.demo-tab:after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: transparent;
  transition: background-color var(--transition-fast);
}

.demo-tab.active {
  color: var(--primary-color);
}

.demo-tab.active:after {
  background-color: var(--primary-color);
}

.demo-tab:hover:not(.active) {
  color: var(--primary-color);
}

.demo-content {
  display: none;
}

.demo-content.active {
  display: block;
}

.demo-description {
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: var(--bg-light);
  border-bottom: 1px solid var(--border-color);
}

.interactive-demo {
  padding: var(--spacing-lg);
}

.input-group {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.demo-input {
  flex: 1;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  transition: border-color var(--transition-fast);
}

.demo-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(43, 90, 255, 0.15);
}

.demo-result {
  min-height: 200px;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  padding: var(--spacing-md);
  transition: border-color var(--transition-fast);
}

.text-result {
  font-family: monospace;
  white-space: pre-wrap;
  word-break: break-word;
}

.placeholder-text {
  color: var(--text-light);
  font-style: italic;
}