:root {
  /* 新的配色方案 - 更现代的深蓝和亮金色调 */
  --primary: #F8D12F;
  --primary-dark: #F0B90B;
  --primary-light: #FBE27A;
  --dark: #0F0E1A;
  --dark-secondary: #1A1932;
  --grey: #616182;
  --grey-light: #A0A0B8;
  --white: #FFFFFF;
  --off-white: #F6F6F9;
  
  /* 间距变量 */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 3rem;
  --spacing-xl: 5rem;
  
  /* 圆角 */
  --radius-sm: 4px;
  --radius: 8px;
  --radius-lg: 16px;
  
  /* 阴影 */
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.1);
  --shadow: 0 4px 16px rgba(0,0,0,0.12);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.16);
}

/* 基础重置 */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  line-height: 1.6;
  color: var(--dark);
  background-color: var(--white);
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.3s ease;
}

ul, ol {
  list-style: none;
}

img, svg {
  max-width: 100%;
  display: block;
}

button, .btn {
  cursor: pointer;
  font-family: inherit;
  border: none;
  background: none;
}

/* 布局容器 */
.container {
  width: 100%;
  max-width: 1200px;
  padding: 0 var(--spacing-sm);
  margin: 0 auto;
}

.section {
  padding: var(--spacing-xl) 0;
}

.section-title {
  font-size: 2.2rem;
  margin-bottom: var(--spacing-md);
  text-align: center;
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background-color: var(--primary);
  margin: var(--spacing-sm) auto 0;
}

.section-description {
  font-size: 1.1rem;
  color: var(--grey);
  text-align: center;
  max-width: 600px;
  margin: 0 auto var(--spacing-lg);
}

/* 导航栏 */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background-color: rgba(15, 14, 26, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  padding: var(--spacing-sm) 0;
  transition: all 0.3s ease;
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

.logo-text {
  margin-left: var(--spacing-xs);
  color: var(--white);
  font-weight: 700;
  font-size: 1.2rem;
}

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

.nav-list {
  display: flex;
}

.nav-item {
  margin-left: var(--spacing-md);
  position: relative;
}

.nav-link {
  color: var(--grey-light);
  font-weight: 500;
  padding: var(--spacing-xs);
}

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

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

.language-switch {
  margin-left: var(--spacing-md);
  color: var(--primary);
  font-weight: 500;
  display: flex;
  align-items: center;
}

.language-switch svg {
  margin-right: 5px;
}

.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 30px;
  height: 21px;
  background: none;
  border: none;
  cursor: pointer;
}

.mobile-toggle span {
  width: 100%;
  height: 3px;
  background-color: var(--white);
  border-radius: 10px;
  transition: all 0.3s ease;
}

/* 英雄区域 */
.hero {
  padding-top: calc(76px + var(--spacing-xl));
  background: linear-gradient(135deg, var(--dark) 0%, var(--dark-secondary) 100%);
  color: var(--white);
  position: relative;
  overflow: hidden;
}

.hero-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-lg);
}

.hero-content {
  flex: 1;
  max-width: 600px;
}

.hero-title {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  line-height: 1.2;
}

.hero-title span {
  color: var(--primary);
  position: relative;
  display: inline-block;
}

.hero-title span::after {
  content: '';
  position: absolute;
  bottom: 5px;
  left: 0;
  width: 100%;
  height: 8px;
  background-color: var(--primary-dark);
  opacity: 0.3;
  z-index: -1;
}

.hero-subtitle {
  font-size: 1.2rem;
  margin-bottom: var(--spacing-md);
  color: var(--grey-light);
}

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

.hero-image {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.hero-image .device-mockup {
  width: 100%;
  max-width: 360px;
  filter: drop-shadow(0 10px 20px rgba(0,0,0,0.3));
}

/* 按钮样式 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 1.8rem;
  border-radius: var(--radius);
  font-weight: 600;
  transition: all 0.3s ease;
}

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

.btn-primary:hover {
  background-color: var(--primary-dark);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.btn-outline {
  border: 2px solid var(--primary);
  color: var(--primary);
}

.btn-outline:hover {
  background-color: var(--primary);
  color: var(--dark);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.btn-icon {
  margin-left: var(--spacing-xs);
}

/* 特点区块 */
.features {
  background-color: var(--off-white);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-md);
}

.feature-card {
  background-color: var(--white);
  border-radius: var(--radius);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
  text-align: center;
}

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

.feature-icon {
  width: 60px;
  height: 60px;
  margin: 0 auto var(--spacing-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--primary-light);
  border-radius: 50%;
}

.feature-icon svg {
  width: 32px;
  height: 32px;
  color: var(--primary-dark);
}

.feature-title {
  margin-bottom: var(--spacing-xs);
  font-size: 1.3rem;
}

.feature-description {
  color: var(--grey);
}

/* 优势区块 */
.advantages {
  background-color: var(--dark);
  color: var(--white);
}

.advantages .section-title {
  color: var(--white);
}

.advantages-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
}

.advantage-item {
  display: flex;
  align-items: flex-start;
  padding: var(--spacing-md);
  background-color: var(--dark-secondary);
  border-radius: var(--radius);
  transition: all 0.3s ease;
}

.advantage-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.advantage-number {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary);
  margin-right: var(--spacing-sm);
  line-height: 1;
}

.advantage-content h3 {
  margin-bottom: var(--spacing-xs);
  color: var(--primary-light);
}

.advantage-content p {
  color: var(--grey-light);
}

/* 下载区域 */
.download {
  background: linear-gradient(135deg, var(--dark) 0%, var(--dark-secondary) 100%);
  color: var(--white);
  text-align: center;
}

.download .section-title {
  color: var(--white);
}

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

.download-card {
  background-color: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  max-width: 320px;
  width: 100%;
  text-align: center;
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: all 0.3s ease;
}

.download-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  background-color: rgba(255, 255, 255, 0.08);
}

.download-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--spacing-md);
  background-color: var(--primary);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.download-icon svg {
  width: 36px;
  height: 36px;
  color: var(--dark);
}

.download-title {
  margin-bottom: var(--spacing-xs);
  font-size: 1.3rem;
  color: var(--white);
}

.download-description {
  color: var(--grey-light);
  margin-bottom: var(--spacing-md);
}

.download-btn {
  width: 100%;
}

/* 关于区域 */
.about {
  background-color: var(--off-white);
}

.about-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.about-content p {
  margin-bottom: var(--spacing-md);
  color: var(--grey);
}

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

.footer-top {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.footer-info {
  max-width: 320px;
}

.footer-logo {
  display: flex;
  align-items: center;
  margin-bottom: var(--spacing-sm);
}

.footer-logo-text {
  margin-left: var(--spacing-xs);
  color: var(--white);
  font-weight: 700;
  font-size: 1.2rem;
}

.footer-description {
  color: var(--grey-light);
  margin-bottom: var(--spacing-md);
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
}

.footer-nav-group h4 {
  color: var(--primary);
  margin-bottom: var(--spacing-sm);
  font-size: 1.1rem;
}

.footer-nav-list li {
  margin-bottom: var(--spacing-xs);
}

.footer-nav-link {
  color: var(--grey-light);
}

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

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

.footer-copyright {
  color: var(--grey-light);
}

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

.footer-link {
  color: var(--grey-light);
}

.footer-link:hover {
  color: var(--primary);
}

/* 响应式设计 */
@media (max-width: 992px) {
  .hero-title {
    font-size: 2.5rem;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .hero-container {
    flex-direction: column;
  }
  
  .hero-content {
    max-width: 100%;
    text-align: center;
  }
  
  .hero-buttons {
    justify-content: center;
  }
}

@media (max-width: 768px) {
  .mobile-toggle {
    display: flex;
  }
  
  .nav {
    position: fixed;
    top: 76px;
    left: 0;
    width: 100%;
    height: 0;
    background-color: var(--dark);
    overflow: hidden;
    transition: height 0.3s ease;
    display: block;
  }
  
  .nav.active {
    height: calc(100vh - 76px);
    overflow-y: auto;
  }
  
  .nav-list {
    flex-direction: column;
    padding: var(--spacing-md);
  }
  
  .nav-item {
    margin: 0;
    margin-bottom: var(--spacing-sm);
  }
  
  .language-switch {
    margin: var(--spacing-sm) 0 0 var(--spacing-md);
  }
  
  .hero-buttons {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .footer-top {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  .footer-info {
    max-width: 100%;
    text-align: center;
  }
  
  .footer-logo {
    justify-content: center;
  }
  
  .footer-nav {
    width: 100%;
    justify-content: space-around;
    gap: var(--spacing-sm);
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  
  .footer-links {
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .footer-nav {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--spacing-md);
  }
  
  .feature-card {
    max-width: 320px;
    margin: 0 auto;
  }
}