/* CSS 变量定义 - 主题颜色 */
:root {
  /* Dark 主题 */
  --bg-primary: #0a0a0a;
  --bg-secondary: #1a1a1a;
  --bg-tertiary: #2a2a2a;
  --text-primary: #ffffff;
  --text-secondary: #b0b0b0;
  --accent-primary: #8b5cf6;
  --accent-secondary: #a78bfa;
  --border-color: #333333;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

/* Light 主题 */
[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f5f5f5;
  --bg-tertiary: #e5e5e5;
  --text-primary: #0a0a0a;
  --text-secondary: #666666;
  --accent-primary: #8b5cf6;
  --accent-secondary: #a78bfa;
  --border-color: #e0e0e0;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 导航栏样式 */
.navbar {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  transition: all 0.3s ease;
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 20px;
}

/* 导航右侧容器样式 */
.nav-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* 调整导航链接样式 */
.nav-links {
  display: flex;
  list-style: none;
  gap: 1.5rem;
  margin: 0;
}

/* 调整主题切换按钮样式 */
.theme-toggle {
  margin: 0;
}

/* 导航语言切换按钮样式 */
.language-toggle button {
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  transition: all 0.3s ease;
  background-color: var(--bg-tertiary);
}

.language-toggle button:hover {
  background-color: var(--accent-primary);
  color: white;
  transform: rotate(180deg);
}

.language-toggle i {
  position: absolute;
  transition: opacity 0.3s ease;
}

.language-toggle i.fa-globe-asia {
  opacity: 1;
}

.language-toggle i.fa-globe-americas {
  opacity: 0;
}

[data-language="en"] .language-toggle i.fa-globe-asia {
  opacity: 0;
}

[data-language="en"] .language-toggle i.fa-globe-americas {
  opacity: 1;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Logo链接样式 - 移除下划线 */
.logo-link {
  text-decoration: none;
  color: inherit;
  display: flex;
  align-items: center;
}

.logo-link:hover,
.logo-link:focus {
  text-decoration: none;
  outline: none;
}

.logo-link h1 {
  margin: 0;
  color: var(--accent-primary);
  font-weight: 700;
  letter-spacing: -0.5px;
}

.logo img {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  object-fit: cover;
}

.logo h1 {
  font-size: 1.5rem;
  color: var(--accent-primary);
  font-weight: 700;
  letter-spacing: -0.5px;
  margin: 0;
}

/* 页脚Logo样式 */
.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
  justify-content: flex-start;
}

.footer-logo img {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  object-fit: cover;
  vertical-align: middle;
}

.footer-logo h3 {
  margin: 0;
  color: var(--accent-primary);
  font-size: 1.5rem;
  line-height: 1;
  vertical-align: middle;
}

/* 页脚信息样式 */
.footer-info {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

/* 确保页脚Logo中的h3样式优先级正确 */
.footer-info .footer-logo h3 {
  margin: 0;
  color: var(--accent-primary);
  font-size: 1.5rem;
  line-height: 1;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-links a {
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
  position: relative;
}

.nav-links a:hover {
  color: var(--accent-primary);
}

/* 导航项激活状态 - 仅用于当前页面指示，不影响语言切换 */
.nav-links > li > a:not(.cn-content):not(.en-content).active {
  color: var(--accent-primary);
}

.nav-links a::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: -5px;
  left: 0;
  background-color: var(--accent-primary);
  transition: width 0.3s ease;
}

.nav-links a:hover::after {
  width: 100%;
}

/* 导航项激活状态下划线 - 仅用于当前页面指示，不影响语言切换 */
.nav-links > li > a:not(.cn-content):not(.en-content).active::after {
  width: 100%;
}

/* 主题切换按钮 */
.theme-toggle button {
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  transition: all 0.3s ease;
  background-color: var(--bg-tertiary);
}

.theme-toggle button:hover {
  background-color: var(--accent-primary);
  color: white;
  transform: rotate(180deg);
}

.theme-toggle i {
  position: absolute;
  transition: opacity 0.3s ease;
}

.theme-toggle i.fa-moon {
  opacity: 1;
}

.theme-toggle i.fa-sun {
  opacity: 0;
}

[data-theme="light"] .theme-toggle i.fa-moon {
  opacity: 0;
}

[data-theme="light"] .theme-toggle i.fa-sun {
  opacity: 1;
}

/* 英雄区域 */
.hero {
  padding: 10rem 0 5rem;
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 50% 50%, var(--accent-primary) 0%, transparent 50%);
  opacity: 0.1;
  animation: pulse 4s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
    opacity: 0.1;
  }
  50% {
    transform: scale(1.2);
    opacity: 0.2;
  }
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero h2 {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 1.5rem;
  line-height: 1.2;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 3rem;
  margin-top: 3rem;
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.stat-item i {
  font-size: 2rem;
  color: var(--accent-primary);
  background-color: var(--bg-tertiary);
  width: 60px;
  height: 60px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

.stat-item:hover i {
  transform: translateY(-5px);
  background-color: var(--accent-primary);
  color: white;
  box-shadow: 0 10px 20px rgba(139, 92, 246, 0.3);
}

.stat-item span {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* 通用部分标题样式 */
section h2 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 3rem;
  text-align: center;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* 功能展示 */
.features {
  padding: 5rem 0;
  background-color: var(--bg-primary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.feature-item {
  background-color: var(--bg-secondary);
  border-radius: 12px;
  padding: 1.5rem;
  text-align: center;
  transition: all 0.3s ease;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow);
}

.feature-item:hover {
  transform: translateY(-10px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
  border-color: var(--accent-primary);
}

.feature-item img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: 8px;
  margin-bottom: 1.5rem;
  transition: all 0.3s ease;
}

.feature-item:hover img {
  transform: scale(1.05);
}

.feature-item h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.feature-item p {
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 核心价值 */
.value {
  padding: 5rem 0;
  background-color: var(--bg-secondary);
}

.value-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.value-item {
  text-align: center;
  padding: 2rem 1.5rem;
  background-color: var(--bg-tertiary);
  border-radius: 12px;
  transition: all 0.3s ease;
  border: 1px solid var(--border-color);
}

.value-item:hover {
  transform: translateY(-5px);
  border-color: var(--accent-primary);
  box-shadow: 0 10px 30px rgba(139, 92, 246, 0.2);
}

.value-icon {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  transition: all 0.3s ease;
}

.value-item:hover .value-icon {
  transform: scale(1.1) rotate(10deg);
  box-shadow: 0 10px 20px rgba(139, 92, 246, 0.3);
}

.value-icon i {
  font-size: 2.5rem;
  color: white;
}

.value-item h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.value-item p {
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 隐私保护 */
.privacy-highlight {
  padding: 5rem 0;
  background-color: var(--bg-primary);
  position: relative;
  overflow: hidden;
}

.privacy-highlight::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: repeating-linear-gradient(
    45deg,
    var(--bg-secondary),
    var(--bg-secondary) 10px,
    var(--bg-primary) 10px,
    var(--bg-primary) 20px
  );
  opacity: 0.1;
}

.privacy-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 3rem;
  position: relative;
  z-index: 1;
}

.privacy-text {
  flex: 1;
}

.privacy-text h2 {
  text-align: left;
  margin-bottom: 1.5rem;
}

.privacy-text p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

.privacy-icon {
  font-size: 10rem;
  color: var(--accent-primary);
  opacity: 0.5;
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% {
    transform: translateY(0px) rotate(0deg);
  }
  50% {
    transform: translateY(-20px) rotate(5deg);
  }
}

/* 下载区域 */
.download {
  padding: 5rem 0;
  background-color: var(--bg-secondary);
  text-align: center;
}

.download h2 {
  margin-bottom: 1rem;
}

.download p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.appstore-btn {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  background-color: var(--text-primary);
  color: var(--bg-primary);
  padding: 1rem 2rem;
  border-radius: 12px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
  box-shadow: var(--shadow);
}

.appstore-btn:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
}

.appstore-btn i {
  font-size: 2.5rem;
}

.appstore-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.appstore-text span {
  font-size: 0.9rem;
  opacity: 0.8;
}

.appstore-text strong {
  font-size: 1.2rem;
}

/* 页脚 */
.footer {
  background-color: var(--bg-tertiary);
  padding: 3rem 0 1rem;
  border-top: 1px solid var(--border-color);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-info h3 {
  color: var(--accent-primary);
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.footer-info p {
  color: var(--text-secondary);
  line-height: 1.6;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer-links a:hover {
  color: var(--accent-primary);
}

.footer-social {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}

.footer-social a {
  color: var(--text-secondary);
  font-size: 1.5rem;
  transition: all 0.3s ease;
}

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

.footer-copyright {
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.9rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
}

/* 隐私协议页面样式 */
.privacy-content {
  padding: 8rem 0 5rem;
  background-color: var(--bg-primary);
}

.privacy-content h2 {
  margin-bottom: 2rem;
}

.privacy-text {
  background-color: var(--bg-secondary);
  padding: 2rem;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow);
}

.privacy-text h3 {
  color: var(--accent-primary);
  margin: 2rem 0 1rem;
  font-size: 1.3rem;
}

.privacy-text h3:first-child {
  margin-top: 0;
}

.privacy-text p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 1rem;
}

.privacy-text ul {
  color: var(--text-secondary);
  margin-left: 2rem;
  margin-bottom: 1rem;
}

.privacy-text li {
  margin-bottom: 0.5rem;
  line-height: 1.6;
}

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--accent-primary);
  color: white;
  padding: 0.8rem 1.5rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 500;
  margin-top: 2rem;
  transition: all 0.3s ease;
}

.back-btn:hover {
  background-color: var(--accent-secondary);
  transform: translateX(-5px);
  box-shadow: 0 5px 15px rgba(139, 92, 246, 0.3);
}

/* 平滑滚动 */
html {
  scroll-behavior: smooth;
}

/* 滚动条样式 */
::-webkit-scrollbar {
  width: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--accent-primary);
  border-radius: 4px;
}

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

/* 动画效果 - 元素进入动画 */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
    opacity: 0.1;
  }
  50% {
    transform: scale(1.2);
    opacity: 0.2;
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0px) rotate(0deg);
  }
  50% {
    transform: translateY(-20px) rotate(5deg);
  }
}

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

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(50px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.8);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* 应用动画效果 */
.feature-item,
.value-item,
.stat-item {
  animation: fadeInUp 0.6s ease-out forwards;
  opacity: 0;
}

.feature-item:nth-child(1),
.value-item:nth-child(1) {
  animation-delay: 0.1s;
}

.feature-item:nth-child(2),
.value-item:nth-child(2) {
  animation-delay: 0.2s;
}

.feature-item:nth-child(3),
.value-item:nth-child(3) {
  animation-delay: 0.3s;
}

.feature-item:nth-child(4),
.value-item:nth-child(4) {
  animation-delay: 0.4s;
}

.feature-item:nth-child(5) {
  animation-delay: 0.5s;
}

/* 英雄区域动画 */
.hero h2 {
  animation: fadeInUp 0.8s ease-out forwards;
  opacity: 0;
  animation-delay: 0.2s;
}

.hero p {
  animation: fadeInUp 0.8s ease-out forwards;
  opacity: 0;
  animation-delay: 0.4s;
}

.hero-stats {
  animation: fadeIn 1s ease-out forwards;
  opacity: 0;
  animation-delay: 0.6s;
}

/* 功能展示区域动画 */
.features h2 {
  animation: fadeInUp 0.8s ease-out forwards;
  opacity: 0;
}

.features-grid {
  animation: fadeIn 1s ease-out forwards;
  opacity: 0;
  animation-delay: 0.3s;
}

/* 核心价值区域动画 */
.value h2 {
  animation: fadeInUp 0.8s ease-out forwards;
  opacity: 0;
}

.value-grid {
  animation: fadeIn 1s ease-out forwards;
  opacity: 0;
  animation-delay: 0.3s;
}

/* 隐私保护区域动画 */
.privacy-highlight h2 {
  animation: fadeInUp 0.8s ease-out forwards;
  opacity: 0;
}

.privacy-text {
  animation: slideInLeft 0.8s ease-out forwards;
  opacity: 0;
  animation-delay: 0.3s;
}

.privacy-icon {
  animation: float 6s ease-in-out infinite, scaleIn 1s ease-out forwards;
  opacity: 0;
  animation-delay: 0.5s;
}

/* 下载区域动画 */
.download h2 {
  animation: fadeInUp 0.8s ease-out forwards;
  opacity: 0;
}

.download p {
  animation: fadeInUp 0.8s ease-out forwards;
  opacity: 0;
  animation-delay: 0.3s;
}

.appstore-btn {
  animation: scaleIn 1s ease-out forwards;
  opacity: 0;
  animation-delay: 0.5s;
}

/* 导航栏链接动画 */
.nav-links a {
  transition: all 0.3s ease;
}

/* 按钮悬停动画 */
.appstore-btn,
.back-btn,
.theme-toggle button {
  transition: all 0.3s ease;
}

/* 图片悬停动画 */
.feature-item img {
  transition: all 0.3s ease;
}

.feature-item:hover img {
  transform: scale(1.05) rotate(2deg);
}

/* 卡片悬停动画 */
.feature-item,
.value-item {
  transition: all 0.3s ease;
}

/* 页面标题和语言切换容器样式 */
.page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

/* 语言切换按钮样式 */
.language-toggle {
  display: flex;
  gap: 0.5rem;
}

.lang-btn {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 0.5rem 1rem;
  cursor: pointer;
  font-size: 0.9rem;
  transition: all 0.3s ease;
  font-weight: 500;
}

.lang-btn:hover {
  background-color: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(139, 92, 246, 0.3);
}

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

/* 语言内容切换样式 */
.cn-content,
.en-content {
  display: none;
}

.cn-content.active,
.en-content.active {
  display: block;
}

/* 隐私政策和用户条款页面特定样式 */
section.privacy-content .privacy-text {
  display: none;
}

section.privacy-content .privacy-text.active {
  display: block;
}

/* 滚动条样式 */
::-webkit-scrollbar {
  width: 8px;
  transition: all 0.3s ease;
}

/* 响应式设计将在 responsive.css 中定义 */