/* ========================================
   蓝色主题单页应用样式
   ======================================== */

/* CSS变量定义 - 蓝色主题 */
:root {
  /* 蓝色主色调 */
  --primary-blue: #F5F4F7;
  --primary-blue-dark: #1976D2;
  --primary-blue-light: #64B5F6;
  --primary-blue-lighter: #BBDEFB;
  
  /* 辅助蓝色 */
  --secondary-blue: #03DAC6;
  --accent-blue: #3700B3;
  
  /* 中性色 */
  --white: #ffffff;
  --light-gray: #f5f5f5;
  --medium-gray: #e0e0e0;
  --dark-gray: #757575;
  --dark-color: #241C2F;
  --black: #000000;
  
  /* 背景色 */
  --bg-primary: var(--white);
  --bg-secondary: var(--light-gray);
  --bg-dark: var(--dark-color);
  
  /* 文字颜色 */
  --text-primary: var(--dark-color);
  --text-secondary: var(--dark-gray);
  --text-white: var(--white);
  
  /* 间距 */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-xxl: 3rem;
  
  /* 圆角 */
  --border-radius: 8px;
  --border-radius-sm: 4px;
  --border-radius-lg: 12px;
  
  /* 透明度颜色 */
  --primary-blue-12: #2196F31F;  /* rgba(33, 150, 243, 0.12) */
  --primary-blue-15: #2196F326;  /* rgba(33, 150, 243, 0.15) */
  --primary-blue-20: #2196F333;  /* rgba(33, 150, 243, 0.2) */
  --primary-blue-25: #2196F340;  /* rgba(33, 150, 243, 0.25) */
  --white-90: #FFFFFFE6;  /* rgba(255, 255, 255, 0.9) */
  --black-70: #000000B3;  /* rgba(0, 0, 0, 0.7) */
  --black-50: #00000080;  /* rgba(0, 0, 0, 0.5) */
  --white-20: #FFFFFF33;  /* rgba(255, 255, 255, 0.2) */
  
  /* 阴影 */
  --shadow-sm: 0 1px 3px var(--primary-blue-12);
  --shadow-md: 0 4px 6px var(--primary-blue-15);
  --shadow-lg: 0 10px 15px var(--primary-blue-20);
  --shadow-xl: 0 20px 25px var(--primary-blue-25);
  
  /* 过渡动画 */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* 重置样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  overflow-x: hidden;
  /* 支持安全区域 */
  padding-top: env(safe-area-inset-top);
  padding-bottom: env(safe-area-inset-bottom);
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
}

body.show-bg {
  background-image: url('/assets/onepagebg-Co9YNCat.png');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  background-attachment: fixed;
}

/* 容器 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* ========================================
   头部导航样式
   ======================================== */

.header {
  position: sticky;
  top: 0;
  z-index: 1000;  
  /* 支持刘海屏 */
  padding-top: max(env(safe-area-inset-top));
}

.navbar {
  width: 100vw;
  margin: 0 auto;
}

/* ========================================
   PC端导航样式
   ======================================== */

.desktop-nav {
  display: flex;  
  justify-content: space-between;
  position: relative;
  height: 6rem; 
}

/* PC端品牌区域 */
.desktop-nav .nav-brand {
  display: flex;
  align-items: center; 
}

.desktop-nav .brand-logo {
  display: flex;
  align-items: center;
  gap: 0.7rem; 
  position: absolute;
  left: 2.4rem; 
}

.desktop-nav .logo-monogram {
  width: 4.2rem;
  height: 3.6rem;
  object-fit: contain;
}

.desktop-nav .logo-text {
  font-family: 'Nunito Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 1.8rem;
  font-weight: 500;
  color: var(--dark-color);
  letter-spacing: 0.5px; 
}


/* ========================================
   移动端导航样式
   ======================================== */

.mobile-nav {
  display: none;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-lg);
  position: relative;
}

/* 移动端左侧图标区域 */
.mobile-nav .nav-left {
  display: flex;
  align-items: center;
}

.mobile-nav .menu-toggle {
  background: none;
  border: none;
  padding: var(--spacing-sm);
  cursor: pointer;
  color: var(--text-primary);
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-fast);
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.mobile-nav .menu-toggle:hover {
  color: var(--primary-blue);
}

.mobile-nav .menu-toggle span {
  width: 20px;
  height: 2px;
  background-color: currentColor;
  transition: all var(--transition-normal);
}

.mobile-nav .menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-nav .menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.mobile-nav .menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

/* 移动端中央品牌区域 */
.mobile-nav .nav-center {
  flex: 1;
  display: flex;
  justify-content: center;
}

.mobile-nav .brand-logo {
  display: flex;
  align-items: center;
  gap: 0.45rem;  
  justify-content: center;
  position: absolute;
  left: 0.8rem;
}

.mobile-nav .logo-monogram {
  width: 2.1rem;
  height: 1.8rem;
  object-fit: contain;
}

.mobile-nav .logo-text {
  font-family: 'Nunito Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 1.4rem;
  font-weight: 500;
  color: var(--dark-color);
  letter-spacing: 0.5px;
  margin-top: 2px;
}

/* 移动端右侧图标区域 */
.mobile-nav .nav-right {
  display: flex;
  align-items: center;
}

/* 语言切换器样式 */
.language-switcher {
  display: none;
  position: relative;
}

.language-toggle {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--medium-gray);
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 0.875rem;
  color: var(--text-primary);
}

.language-toggle:hover {
  border-color: var(--primary-blue);
  color: var(--primary-blue);
}

.language-toggle.active {
  border-color: var(--primary-blue);
  color: var(--white);
}

.language-menu {
  position: absolute;
  top: 100%;
  right: 0;
  min-width: 120px;
  background-color: var(--white);
  border: 1px solid var(--medium-gray);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition-normal);
  z-index: 1000;
  list-style: none;
  padding: var(--spacing-xs);
  margin: var(--spacing-xs) 0 0 0;
}

/* 确保没有active类时下拉菜单隐藏 */
.language-menu:not(.active) {
  opacity: 0 !important;
  visibility: hidden !important;
  transform: translateY(10px) !important;
}

.language-menu.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.language-switcher:hover .language-menu:not(.active) {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.language-item {
  list-style: none;
}

.language-option {
  width: 100%;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: none;
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: left;
  font-size: 0.875rem;
  color: var(--text-primary);
  border-radius: var(--border-radius-sm);
}

.language-option:hover {
  color: var(--primary-blue);
}

.language-item.active .language-option {
  color: var(--primary-blue);
}

.dropdown-arrow {
  font-size: 0.75rem;
  transition: transform var(--transition-fast);
}

.language-toggle.active .dropdown-arrow {
  transform: rotate(180deg);
}


/* ========================================
   主要内容区域样式
   ======================================== */

.main-content {
  min-height: calc(100vh - 20rem);
  margin-left: 14rem;
  margin-right: 14rem;
}

/* 首页部分 */
.hero-section {
  height: calc(100vh - 12rem); 
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xxl) 0;
  color: var(--text-white);
}

.hero-container {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
  padding: 0 var(--spacing-lg);
}

.hero-title {
  font-family: 'Nunito Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-weight: 600;
  font-size: 68px;
  line-height: 86px;
  letter-spacing: 0%;
  text-align: center;
  margin-bottom: var(--spacing-lg);
  background: linear-gradient(179.72deg, #2F0D68 -15.95%, #8E51FF 107.85%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
} 

.download-section {
  margin-top: var(--spacing-xxl);
}

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

.download-btn {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-xl);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--border-radius-lg);
  text-decoration: none;
  color: #374151;
  transition: all var(--transition-normal);
  min-width: 200px;
}

.download-btn:hover {
  background: rgba(255, 255, 255, 1);
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.btn-icon img {
  width: 24px;
  height: 24px;
  object-fit: contain;
}

.btn-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.btn-subtitle {
  font-size: 0.75rem;
  color: #6b7280;
  line-height: 1;
}

.btn-title {
  font-size: 1rem;
  font-weight: 600;
  color: #111827;
  line-height: 1.2;
}

/* Terms of Service 部分 */
.terms-section {
  min-height: calc(100vh - 12rem);
  width: 100vw;
  display: flex;
  align-items: flex-start;
  justify-content: start;
  padding-top: 1.2rem;  
  position: relative; 
  margin-top: 0;
}

.terms-container { 
  width: 66rem;
  background-color: #FFFFFF;
  border-radius: 24px;
  padding: 3rem 3rem;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
}

.terms-header {
  background-color: transparent; 
  padding-left: 1rem;
  display: flex;
  align-items: center;
  justify-content: start;
  position: relative;
  margin-bottom: 0;
}

.terms-back-btn {
  position: absolute;
  left: -1rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #241C2F; 
  transition: opacity 0.2s ease;
}

.terms-back-btn:hover {
  opacity: 0.5;
}

.terms-back-btn svg {
  width: 1.8rem;
  height: 1.8rem;
}

.terms-title {
  font-family: 'Nunito Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-weight: 500;
  font-size: 1.2rem;
  color: #241C2F;
  margin: 0;
  line-height: 1.2;
  text-align: center;
}

.terms-content {
  font-family: 'Nunito Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: #241C2F;
  line-height: 1.8;
}

.terms-intro {
  font-size: 1rem;
  font-weight: 400;
  margin-bottom: 2.5rem;
  line-height: 1.8;
}

.terms-section-item {
  margin-bottom: 1.5rem;
}

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

.terms-section-title {
  font-family: 'Nunito Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-weight: 600;
  font-size: 1.25rem;
  color: #241C2F;
  margin: 0 0 1rem 0;
  line-height: 1.4;
}

.terms-subsection-title {
  font-family: 'Nunito Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-weight: 600;
  font-size: 1.125rem;
  color: #241C2F;
  margin: 1.5rem 0 0.75rem 0;
  line-height: 1.4;
}

.terms-section-item p {
  font-size: 1rem;
  font-weight: 400;
  color: #241C2F;
  margin: 0 0 1rem 0;
  line-height: 1.8;
}

.terms-section-item p:last-child {
  margin-bottom: 0;
}

.terms-list {
  margin: 1rem 0;
  padding-left: 1.5rem;
  list-style-type: disc;
}

.terms-list li {
  font-size: 1rem;
  font-weight: 400;
  color: #241C2F;
  margin-bottom: 0.5rem;
  line-height: 1.8;
}

.terms-list li:last-child {
  margin-bottom: 0;
}

/* Section 显示/隐藏控制 */
.section {
  display: none;
}

.section.active {
  display: block;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .main-content {
    margin-left: 0;
    margin-right: 0;
  }

  .terms-container {
    width: 88vw;
    margin-left: 6vw;
  }
  
  .terms-header {
    padding-left: 1rem;
    margin-top: 4rem;
    background-color: transparent; 
  }
  
  .terms-back-btn {
    left: 1rem;
    padding: 0.25rem; 
  }
  
  .terms-title {
    font-size: 1.125rem;
    text-align: start;
    margin-left: 2.4rem;
  }
  
  .terms-container {
    padding: 2.5rem 1.5rem;
    border-radius: 16px;
  }
  
  .terms-section-title {
    font-size: 1.125rem;
  }
  
  .hero-title {
    font-family: 'Nunito Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-weight: 600;
    font-size: 2.4rem;
    line-height: 60px;
    letter-spacing: 0%;
    text-align: center;
    background: linear-gradient(179.72deg, #2F0D68 -15.95%, #8E51FF 107.85%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
  }
  
  .download-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .download-btn {
    min-width: 250px;
  }
}
 
.btn {
  padding: var(--spacing-md) var(--spacing-xl);
  border: none;
  border-radius: var(--border-radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

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

.btn-primary:hover {
  background-color: var(--light-gray);
  transform: translateY(-2px);
}



/* ========================================
   页脚样式
   ======================================== */

.footer {
  padding: var(--spacing-xl) 0 var(--spacing-lg);
  background: transparent;
  margin-top: var(--spacing-md);
}

.footer-container {
  width: calc(100vw - 37rem);
  margin: 0 auto;
  padding: 0 var(--spacing-lg); 
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center; 
  flex-wrap: wrap; 
  gap: 4.8rem;
}

.footer-left .copyright {
  font-family: 'PingFang SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-weight: 400;
  font-size: 14px;
  line-height: 20px;
  letter-spacing: 0%;
  text-align: center;
  color: #241C2F;
  margin: 0;
}

.footer-right {
  display: flex;
  justify-content: flex-start;
}

.footer-links {
  display: flex;
  gap: 4.8rem; 
  align-items: center; 
  border-radius: var(--border-radius);
}

.footer-link {
  font-family: 'PingFang SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-weight: 400;
  font-size: 14px;
  line-height: 20px;
  letter-spacing: 0%;
  text-align: center;
  color: #241C2F;
  text-decoration: none;
  transition: color var(--transition-normal);
}

.footer-link:hover {
  opacity: 0.8;
  text-decoration: underline;
}

.footer-link.active {
  text-decoration: underline;
}

@media (max-width: 768px) {
  .footer-container {
    width: 100vw;
  }
  
  .footer-content {
    flex-direction: column;
    text-align: center;
    gap: 0.8rem;
  }
  
  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.8rem;
  }
}

/* ========================================
   响应式设计
   ======================================== */

/* 平板设备 */
@media (max-width: 1024px) {
  .desktop-nav {
    display: none;
  }
  
  .mobile-nav {
    display: flex;
  }
  
}

/* 移动设备 */
@media (max-width: 768px) {
  .mobile-nav {
    padding: var(--spacing-sm) var(--spacing-md);
  }
  
}

/* 小屏移动设备 */
@media (max-width: 480px) {
  .mobile-nav {
    padding: var(--spacing-xs) var(--spacing-sm);
  }
  
  .mobile-nav .logo-monogram {
    width: 4.2rem;
    height: 3.6rem;
    object-fit: contain;
  }
  
  .mobile-nav .logo-text { 
    font-size: 1.4rem;
  }
}

/* 超小屏设备 */
@media (max-width: 360px) {
}

/* ========================================
   滚动行为优化
   ======================================== */


/* 防止iOS橡皮筋效果 */
body {
  overscroll-behavior: none;
}

/* 移动端滚动优化 */
@media (max-width: 768px) {
  body {
    -webkit-overflow-scrolling: touch;
  }
  
  .main-content {
    touch-action: pan-y;
  }
}

/* ========================================
   动画和过渡效果
   ======================================== */

/* 淡入动画 */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn 0.6s ease-out;
}

/* 滑入动画 */
@keyframes slideInLeft {
  from {
    transform: translateX(-100%);
  }
  to {
    transform: translateX(0);
  }
}

.slide-in-left {
  animation: slideInLeft 0.5s ease-out;
}

/* 脉冲动画 */
@keyframes pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

.pulse {
  animation: pulse 2s infinite;
}

/* ========================================
   无障碍和可用性
   ======================================== */

/* 焦点样式 */
button:focus,
input:focus,
a:focus {
  outline: 2px solid var(--primary-blue);
  outline-offset: 2px;
}

/* 减少动画（用户偏好） */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* 高对比度模式 */
@media (prefers-contrast: high) {
  :root {
    --primary-blue: #0066cc;
    --text-primary: #000000;
    --text-secondary: #333333;
  }
}

/* 暗色模式支持 */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #121212;
    --bg-secondary: #1e1e1e;
    --text-primary: #ffffff;
    --text-secondary: #b3b3b3;
    --medium-gray: #333333;
  }
}