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

:root {
  --primary-color: #4285f4;
  --primary-dark: #3367d6;
  --secondary-color: #34a853;
  --accent-color: #ea4335;
  --warning-color: #fbbc05;
  --text-primary: #202124;
  --text-secondary: #5f6368;
  --text-light: #9aa0a6;
  --bg-light: #f8f9fa;
  --bg-white: #ffffff;
  --border-color: #dadce0;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
  --shadow-hover: 0 10px 20px rgba(0, 0, 0, 0.1), 0 6px 6px rgba(0, 0, 0, 0.16);
  --transition: all 0.3s ease;
  --border-radius: 8px;
  --container-width: 1200px;
}

body {
  font-family: "Inter", "Roboto", sans-serif;
  color: var(--text-primary);
  background-color: var(--bg-white);
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* 动画定义 */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes fadeRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
  100% {
    transform: scale(1);
  }
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

/* 动画类 */
.animate-fade-up {
  opacity: 0;
  animation: fadeUp 0.8s ease forwards;
}

.animate-fade-left {
  opacity: 0;
  animation: fadeLeft 0.8s ease forwards;
}

.animate-fade-right {
  opacity: 0;
  animation: fadeRight 0.8s ease forwards;
}

.animate-delay-50 {
  animation-delay: 0.05s;
}

.animate-delay-100 {
  animation-delay: 0.1s;
}

.animate-delay-150 {
  animation-delay: 0.15s;
}

.animate-delay-200 {
  animation-delay: 0.2s;
}

.animate-delay-250 {
  animation-delay: 0.25s;
}

.animate-delay-300 {
  animation-delay: 0.3s;
}

.animate-delay-400 {
  animation-delay: 0.4s;
}

.animate-count {
  opacity: 0;
  animation: fadeUp 0.8s ease forwards;
}

/* 导航栏 */
.navbar {
  background-color: var(--bg-white);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: 15px 0;
}

.nav-container {
  max-width: var(--container-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 20px;
}

.nav-logo {
  display: flex;
  align-items: center;
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary-color);
  transition: var(--transition);
}

.nav-logo:hover {
  transform: scale(1.05);
}

.nav-logo i {
  margin-right: 10px;
  font-size: 2rem;
  color: var(--primary-color);
}

.nav-menu {
  display: flex;
  list-style: none;
}

.nav-item {
  margin: 0 15px;
  position: relative;
}

.nav-item a {
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 500;
  font-size: 1.1rem;
  padding: 8px 0;
  transition: var(--transition);
  position: relative;
}

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

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

.nav-item.active a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: var(--primary-color);
  border-radius: 3px;
}

.download-btn {
  background-color: var(--primary-color);
  color: white;
  border: none;
  padding: 12px 24px;
  border-radius: var(--border-radius);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
}

.hamburger .bar {
  width: 25px;
  height: 3px;
  background-color: var(--text-primary);
  margin: 3px 0;
  border-radius: 3px;
  transition: var(--transition);
}

/* 英雄区域 */
.hero {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 80px 20px;
  max-width: var(--container-width);
  margin: 0 auto;
  min-height: 80vh;
}

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

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  background: linear-gradient(
    90deg,
    var(--primary-color),
    var(--secondary-color)
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.3rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
}

.highlight {
  color: var(--primary-color);
  font-weight: 600;
}

.hero-buttons {
  display: flex;
  gap: 20px;
}

.hero-image {
  flex: 1;
  display: flex;
  justify-content: center;
}

.chrome-window {
  width: 400px;
  background: white;
  border-radius: 12px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
  overflow: hidden;
  transform: perspective(1000px) rotateY(-5deg);
  transition: var(--transition);
  animation: float 6s ease-in-out infinite;
}

.chrome-window:hover {
  transform: perspective(1000px) rotateY(0deg);
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.15);
}

.window-header {
  background-color: #f1f3f4;
  padding: 12px 15px;
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
}

.window-dots {
  display: flex;
  gap: 8px;
  margin-right: 15px;
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.dot.red {
  background-color: #ff5f57;
}

.dot.yellow {
  background-color: #febc2e;
}

.dot.green {
  background-color: #28c840;
}

.window-url {
  flex: 1;
  background-color: white;
  padding: 8px 15px;
  border-radius: 20px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  text-align: center;
}

.window-content {
  padding: 30px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.content-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px 10px;
  border-radius: var(--border-radius);
  background-color: var(--bg-light);
  transition: var(--transition);
}

.content-item:hover {
  background-color: var(--primary-color);
  color: white;
  transform: translateY(-5px);
}

.content-item i {
  font-size: 2rem;
  margin-bottom: 10px;
  color: var(--primary-color);
}

.content-item:hover i {
  color: white;
}

.content-item span {
  font-weight: 600;
  font-size: 1rem;
}

/* 按钮样式 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 15px 30px;
  border-radius: var(--border-radius);
  font-weight: 600;
  font-size: 1.1rem;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  border: none;
}

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

.btn-primary:hover {
  background-color: var(--primary-dark);
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  animation: pulse 1s infinite;
}

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

.btn-secondary:hover {
  background-color: rgba(66, 133, 244, 0.1);
  transform: translateY(-3px);
}

.btn-large {
  padding: 18px 36px;
  font-size: 1.2rem;
}

/* 区域通用样式 */
section {
  padding: 80px 0;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.section-subtitle {
  font-size: 1.2rem;
  text-align: center;
  color: var(--text-secondary);
  max-width: 800px;
  margin: 0 auto 50px;
}

/* 特性网格 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 50px;
}

.feature-card {
  background-color: var(--bg-white);
  border-radius: var(--border-radius);
  padding: 30px;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 1px solid transparent;
}

.feature-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-hover);
  border-color: var(--primary-color);
}

.feature-icon {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-bottom: 20px;
  color: white;
}

.feature-icon.speed {
  background-color: var(--accent-color);
}

.feature-icon.security {
  background-color: var(--secondary-color);
}

.feature-icon.ai {
  background-color: #9c27b0;
}

.feature-icon.sync {
  background-color: #ff9800;
}

.feature-icon.translate {
  background-color: #00bcd4;
}

.feature-icon.extensions {
  background-color: #673ab7;
}

.feature-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 15px;
  color: var(--text-primary);
}

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

/* 核心功能 */
.core-features-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
  margin-top: 50px;
}

.core-feature {
  background-color: var(--bg-white);
  border-radius: var(--border-radius);
  padding: 30px;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border-left: 4px solid var(--primary-color);
}

.core-feature:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-hover);
  border-left-color: var(--secondary-color);
}

.core-feature-header {
  display: flex;
  align-items: center;
  margin-bottom: 20px;
}

.core-feature-header i {
  font-size: 2rem;
  color: var(--primary-color);
  margin-right: 15px;
}

.core-feature-header h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.core-feature-desc {
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.7;
}

.core-feature-list {
  list-style: none;
}

.core-feature-list li {
  margin-bottom: 10px;
  display: flex;
  align-items: center;
}

.core-feature-list i {
  color: var(--secondary-color);
  margin-right: 10px;
  font-size: 1.2rem;
}

/* 统计数据 */
.stats {
  background-color: var(--primary-color);
  color: white;
  padding: 80px 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 30px;
  text-align: center;
}

.stat-item {
  padding: 30px 20px;
  transition: var(--transition);
}

.stat-item:hover {
  transform: translateY(-10px);
}

.stat-number {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: 10px;
}

.stat-label {
  font-size: 1.2rem;
  font-weight: 500;
  opacity: 0.9;
}

/* 平台支持 */
.platforms-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 30px;
  margin-top: 50px;
}

.platform-item {
  background-color: var(--bg-white);
  border-radius: var(--border-radius);
  padding: 30px 20px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.platform-item:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-hover);
  background-color: var(--primary-color);
  color: white;
}

.platform-item:hover i {
  color: white;
}

.platform-item i {
  font-size: 3rem;
  margin-bottom: 15px;
  color: var(--primary-color);
  transition: var(--transition);
}

.platform-item h4 {
  font-size: 1.2rem;
  font-weight: 600;
}

/* AI功能区域 */
.ai-section {
  background-color: var(--bg-light);
}

.ai-features {
  display: flex;
  flex-direction: column;
  gap: 40px;
  margin-top: 50px;
}

.ai-feature {
  display: flex;
  align-items: flex-start;
  gap: 30px;
  background-color: var(--bg-white);
  border-radius: var(--border-radius);
  padding: 30px;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

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

.ai-icon {
  flex-shrink: 0;
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background-color: var(--primary-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  color: white;
}

.ai-content {
  flex: 1;
}

.ai-content h3 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 15px;
  color: var(--text-primary);
}

.ai-content p {
  color: var(--text-secondary);
  line-height: 1.7;
  font-size: 1.1rem;
}

/* 下载号召区域 */
.cta {
  background: linear-gradient(
    135deg,
    var(--primary-color),
    var(--secondary-color)
  );
  color: white;
  text-align: center;
  padding: 100px 0;
}

.cta-title {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 20px;
}

.cta-subtitle {
  font-size: 1.3rem;
  max-width: 800px;
  margin: 0 auto 50px;
  opacity: 0.9;
}

.cta-buttons {
  display: flex;
  justify-content: center;
  gap: 30px;
  flex-wrap: wrap;
}

/* 页脚 */
.footer {
  background-color: var(--text-primary);
  color: white;
  padding: 60px 0 30px;
}

.footer-content {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
}

.footer-logo {
  display: flex;
  align-items: center;
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.footer-logo i {
  margin-right: 10px;
  color: var(--primary-color);
}

.footer-desc {
  font-size: 1.1rem;
  color: var(--text-light);
  max-width: 500px;
  margin-bottom: 40px;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 40px;
  margin-bottom: 40px;
}

.footer-column h4 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: white;
}

.footer-column a {
  display: block;
  color: var(--text-light);
  text-decoration: none;
  margin-bottom: 10px;
  transition: var(--transition);
}

.footer-column a:hover {
  color: white;
  transform: translateX(5px);
}

.footer-bottom {
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  color: var(--text-light);
  font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 992px) {
  .hero {
    flex-direction: column;
    text-align: center;
    padding: 60px 20px;
  }

  .hero-content {
    max-width: 100%;
    margin-bottom: 60px;
  }

  .hero-title {
    font-size: 2.8rem;
  }

  .chrome-window {
    width: 350px;
    transform: none;
  }

  .section-title {
    font-size: 2.2rem;
  }

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

@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    left: -100%;
    top: 70px;
    flex-direction: column;
    background-color: var(--bg-white);
    width: 100%;
    text-align: center;
    transition: var(--transition);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    padding: 20px 0;
    z-index: 999;
  }

  .nav-menu.active {
    left: 0;
  }

  .nav-item {
    margin: 15px 0;
  }

  .download-btn {
    display: none;
  }

  .hero-title {
    font-size: 2.3rem;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    max-width: 300px;
  }

  .cta-buttons {
    flex-direction: column;
    align-items: center;
  }

  .ai-feature {
    flex-direction: column;
    text-align: center;
  }

  .ai-icon {
    margin: 0 auto 20px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.8rem;
  }

  .section-title {
    font-size: 1.8rem;
  }

  .stat-number {
    font-size: 2.8rem;
  }

  .cta-title {
    font-size: 2rem;
  }

  .platforms-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* 下载页面特有样式 */
.download-hero {
  background: linear-gradient(
    135deg,
    var(--primary-color),
    var(--secondary-color)
  );
  color: white;
  padding: 100px 0;
  text-align: center;
}

.download-title {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: 20px;
}

.download-subtitle {
  font-size: 1.3rem;
  max-width: 800px;
  margin: 0 auto 40px;
  opacity: 0.9;
}

.version-info {
  display: flex;
  justify-content: center;
  gap: 30px;
  flex-wrap: wrap;
}

.version-badge,
.version-date {
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(255, 255, 255, 0.1);
  padding: 12px 24px;
  border-radius: var(--border-radius);
  backdrop-filter: blur(10px);
}

.version-badge i,
.version-date i {
  color: var(--warning-color);
}

/* 平台卡片 */
.platform-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 50px;
}

.platform-card {
  background-color: var(--bg-white);
  border-radius: var(--border-radius);
  padding: 30px;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 2px solid transparent;
  display: flex;
  flex-direction: column;
}

.platform-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-hover);
  border-color: var(--primary-color);
}

.platform-card-icon {
  font-size: 3rem;
  margin-bottom: 20px;
  color: var(--primary-color);
}

.platform-card-title {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.platform-card-desc {
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.7;
}

.platform-card-specs {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 30px;
  flex-grow: 1;
}

.spec-item {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-secondary);
}

.spec-item i {
  color: var(--primary-color);
  width: 20px;
}

.platform-download-btn {
  margin-bottom: 20px;
}

.platform-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-light);
  font-size: 0.9rem;
  padding-top: 15px;
  border-top: 1px solid var(--border-color);
}

.other-versions {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 500;
}

.other-versions:hover {
  text-decoration: underline;
}

/* 移动设备下载 */
.mobile-platforms {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 50px;
}

.mobile-platform {
  background-color: var(--bg-white);
  border-radius: var(--border-radius);
  padding: 30px;
  box-shadow: var(--shadow);
}

.mobile-platform-header {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 30px;
}

.mobile-platform-icon {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: white;
}

.mobile-platform-icon.android {
  background-color: var(--secondary-color);
}

.mobile-platform-icon.ios {
  background-color: #000000;
}

.mobile-platform-info h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 5px;
  color: var(--text-primary);
}

.mobile-platform-info p {
  color: var(--text-secondary);
}

.mobile-platform-steps {
  margin-bottom: 30px;
}

.step {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  margin-bottom: 20px;
}

.step-number {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--primary-color);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  flex-shrink: 0;
}

.step-content h4 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 5px;
  color: var(--text-primary);
}

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

.mobile-platform-actions {
  display: flex;
  gap: 15px;
  flex-wrap: wrap;
}

/* 安装指南标签页 */
.installation-tabs {
  margin-top: 50px;
  background-color: var(--bg-white);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.tab-buttons {
  display: flex;
  background-color: var(--bg-light);
  border-bottom: 1px solid var(--border-color);
}

.tab-button {
  padding: 20px 30px;
  background: none;
  border: none;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
  flex: 1;
  text-align: center;
}

.tab-button:hover {
  background-color: rgba(0, 0, 0, 0.05);
  color: var(--text-primary);
}

.tab-button.active {
  background-color: var(--bg-white);
  color: var(--primary-color);
  border-bottom: 3px solid var(--primary-color);
}

.tab-content {
  padding: 40px;
}

.tab-pane {
  display: none;
}

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

.installation-steps {
  display: flex;
  flex-direction: column;
  gap: 30px;
}

.installation-step .step-header {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 15px;
}

.installation-step .step-number {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: var(--primary-color);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.installation-step h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
}

.installation-step p {
  color: var(--text-secondary);
  line-height: 1.7;
  padding-left: 70px;
}

/* 版本历史时间线 */
.version-timeline {
  margin-top: 50px;
  position: relative;
  padding-left: 30px;
}

.version-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background-color: var(--primary-color);
  border-radius: 3px;
}

.timeline-item {
  position: relative;
  margin-bottom: 40px;
  padding-left: 30px;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -36px;
  top: 0;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background-color: var(--primary-color);
  border: 3px solid white;
  box-shadow: 0 0 0 3px var(--primary-color);
}

.timeline-date {
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 10px;
  font-size: 1.1rem;
}

.timeline-content h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.timeline-content p {
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 15px;
}

.version-tags {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.version-tag {
  padding: 5px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
}

.version-tag.new {
  background-color: rgba(66, 133, 244, 0.1);
  color: var(--primary-color);
}

.version-tag.security {
  background-color: rgba(52, 168, 83, 0.1);
  color: var(--secondary-color);
}

.version-tag.improvement {
  background-color: rgba(251, 188, 5, 0.1);
  color: var(--warning-color);
}

.version-tag.performance {
  background-color: rgba(234, 67, 53, 0.1);
  color: var(--accent-color);
}

.version-tag.design {
  background-color: rgba(156, 39, 176, 0.1);
  color: #9c27b0;
}

.version-tag.dev {
  background-color: rgba(0, 150, 136, 0.1);
  color: #009688;
}

.view-all-versions {
  text-align: center;
  margin-top: 50px;
}

/* 系统要求表格 */
.requirements-table {
  margin-top: 50px;
  overflow-x: auto;
  box-shadow: var(--shadow);
  border-radius: var(--border-radius);
}

.requirements-table table {
  width: 100%;
  border-collapse: collapse;
  min-width: 800px;
}

.requirements-table th {
  background-color: var(--primary-color);
  color: white;
  padding: 20px;
  text-align: left;
  font-weight: 600;
}

.requirements-table td {
  padding: 20px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
}

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

.requirements-table tr:hover {
  background-color: var(--bg-light);
}

.requirements-table td:first-child {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  color: var(--text-primary);
}

.requirements-table td:first-child i {
  font-size: 1.2rem;
}

/* 下载常见问题 */
.download-faq {
  background-color: var(--bg-light);
}

.faq-accordion {
  margin-top: 30px;
}

.faq-item {
  background-color: var(--bg-white);
  border-radius: var(--border-radius);
  margin-bottom: 15px;
  overflow: hidden;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}

.faq-question {
  padding: 25px 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  transition: var(--transition);
}

.faq-question:hover {
  background-color: rgba(0, 0, 0, 0.02);
}

.faq-question h3 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}

.faq-question i {
  color: var(--text-light);
  transition: var(--transition);
}

.faq-item.active .faq-question i {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 30px;
  max-height: 0;
  overflow: hidden;
  transition:
    max-height 0.3s ease,
    padding 0.3s ease;
}

.faq-item.active .faq-answer {
  padding: 0 30px 25px;
  max-height: 1000px;
}

.faq-answer p,
.faq-answer ol,
.faq-answer ul {
  color: var(--text-secondary);
  line-height: 1.7;
}

.faq-answer ol,
.faq-answer ul {
  padding-left: 20px;
  margin: 15px 0;
}

.faq-answer li {
  margin-bottom: 8px;
}

.faq-answer strong {
  color: var(--text-primary);
}

.more-faq-link {
  text-align: center;
  margin-top: 40px;
}

/* 下载号召区域 */
.download-cta {
  background: linear-gradient(
    135deg,
    var(--primary-color),
    var(--secondary-color)
  );
  color: white;
  text-align: center;
  padding: 100px 0;
}

.download-cta-buttons {
  display: flex;
  justify-content: center;
  gap: 30px;
  flex-wrap: wrap;
}

/* 下载模态框 */
.download-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  backdrop-filter: blur(5px);
}

.download-modal.active {
  display: flex;
}

.modal-content {
  background-color: var(--bg-white);
  border-radius: var(--border-radius);
  width: 90%;
  max-width: 500px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
  overflow: hidden;
  animation: modalFadeIn 0.3s ease;
}

@keyframes modalFadeIn {
  from {
    opacity: 0;
    transform: translateY(-30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 25px 30px;
  border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.8rem;
  color: var(--text-light);
  cursor: pointer;
  line-height: 1;
  transition: var(--transition);
}

.modal-close:hover {
  color: var(--text-primary);
}

.modal-body {
  padding: 30px;
}

.modal-body p {
  color: var(--text-secondary);
  margin-bottom: 25px;
  line-height: 1.7;
}

.download-progress {
  margin-top: 25px;
}

.progress-bar {
  width: 100%;
  height: 10px;
  background-color: var(--bg-light);
  border-radius: 5px;
  overflow: hidden;
  margin-bottom: 15px;
}

.progress-fill {
  height: 100%;
  background-color: var(--primary-color);
  width: 0%;
  transition: width 0.3s ease;
  border-radius: 5px;
}

.progress-text {
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.modal-footer {
  padding: 20px 30px;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  gap: 15px;
}

.modal-cancel {
  background: none;
  border: 2px solid var(--border-color);
  color: var(--text-secondary);
}

.modal-cancel:hover {
  border-color: var(--text-secondary);
}

.btn-outline {
  background: none;
  border: 2px solid var(--border-color);
  color: var(--text-primary);
}

.btn-outline:hover {
  border-color: var(--primary-color);
  background-color: rgba(66, 133, 244, 0.05);
}

.btn-small {
  padding: 10px 20px;
  font-size: 0.9rem;
}

.btn-link {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 500;
}

.btn-link:hover {
  text-decoration: underline;
}

/* 扩展程序页面特有样式 */
.extensions-hero {
  background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
  color: white;
  padding: 100px 0;
  text-align: center;
}

.extensions-title {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: 20px;
}

.extensions-subtitle {
  font-size: 1.3rem;
  max-width: 800px;
  margin: 0 auto 40px;
  opacity: 0.9;
}

.extensions-search {
  max-width: 700px;
  margin: 0 auto;
}

.search-box {
  display: flex;
  background-color: white;
  border-radius: 50px;
  overflow: hidden;
  margin-bottom: 20px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.search-box i {
  padding: 0 20px;
  color: var(--text-light);
  display: flex;
  align-items: center;
}

.search-box input {
  flex: 1;
  border: none;
  padding: 20px 0;
  font-size: 1.1rem;
  outline: none;
  color: var(--text-primary);
}

.search-btn {
  background-color: var(--primary-color);
  color: white;
  border: none;
  padding: 0 40px;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

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

.search-tags {
  display: flex;
  justify-content: center;
  gap: 15px;
  flex-wrap: wrap;
}

.tag {
  background-color: rgba(255, 255, 255, 0.2);
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition);
  backdrop-filter: blur(10px);
}

.tag:hover {
  background-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-3px);
}

/* 扩展程序统计 */
.extensions-stats .stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 30px;
  margin-top: 0;
}

.extensions-stats .stat-item {
  background-color: var(--bg-white);
  border-radius: var(--border-radius);
  padding: 30px;
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  gap: 20px;
  transition: var(--transition);
}

.extensions-stats .stat-item:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-hover);
}

.stat-icon {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  background-color: var(--primary-color);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  flex-shrink: 0;
}

.stat-content {
  flex: 1;
}

.extensions-stats .stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 5px;
  color: var(--text-primary);
}

.extensions-stats .stat-label {
  color: var(--text-secondary);
  font-size: 1rem;
}

/* 扩展程序卡片 */
.extensions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 50px;
}

.extension-card {
  background-color: var(--bg-white);
  border-radius: var(--border-radius);
  padding: 25px;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 1px solid transparent;
}

.extension-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-hover);
  border-color: var(--primary-color);
}

.extension-card-header {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 20px;
}

.extension-icon {
  width: 60px;
  height: 60px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  color: white;
  flex-shrink: 0;
}

.extension-icon.adblock {
  background-color: #ff6b6b;
}

.extension-icon.lastpass {
  background-color: #d32f2f;
}

.extension-icon.grammarly {
  background-color: #15c39a;
}

.extension-icon.momentum {
  background-color: #ffa726;
}

.extension-icon.honey {
  background-color: #f57c00;
}

.extension-icon.notion {
  background-color: #000000;
}

.extension-info {
  flex: 1;
}

.extension-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 5px;
  color: var(--text-primary);
}

.extension-rating {
  display: flex;
  align-items: center;
  gap: 10px;
}

.stars {
  color: var(--warning-color);
}

.rating-text {
  color: var(--text-light);
  font-size: 0.9rem;
}

.extension-desc {
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
  min-height: 80px;
}

.extension-tags {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 25px;
}

.extension-tag {
  background-color: var(--bg-light);
  color: var(--text-secondary);
  padding: 5px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
}

.extension-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.view-all-extensions {
  text-align: center;
  margin-top: 50px;
}

/* 扩展程序分类 */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 30px;
  margin-top: 50px;
}

.category-card {
  background-color: var(--bg-white);
  border-radius: var(--border-radius);
  padding: 30px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.category-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-hover);
}

.category-icon {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: white;
  margin: 0 auto 20px;
}

.category-icon.productivity {
  background-color: #4285f4;
}

.category-icon.shopping {
  background-color: #34a853;
}

.category-icon.social {
  background-color: #ea4335;
}

.category-icon.fun {
  background-color: #fbbc05;
}

.category-icon.accessibility {
  background-color: #9c27b0;
}

.category-icon.dev {
  background-color: #5f6368;
}

.category-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.category-desc {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 15px;
  font-size: 0.9rem;
  min-height: 70px;
}

.category-count {
  color: var(--primary-color);
  font-weight: 600;
  font-size: 0.9rem;
}

/* 扩展程序安装步骤 */
.installation-steps {
  display: flex;
  flex-direction: column;
  gap: 30px;
  margin-top: 50px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.installation-step {
  display: flex;
  align-items: flex-start;
  gap: 30px;
}

.installation-step .step-number {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background-color: var(--primary-color);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.installation-step .step-content {
  flex: 1;
}

.installation-step h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.installation-step p {
  color: var(--text-secondary);
  line-height: 1.7;
}

.installation-step a {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 500;
}

.installation-step a:hover {
  text-decoration: underline;
}

/* 扩展程序开发 */
.development-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  margin-top: 50px;
  align-items: center;
}

.development-info h3 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.development-info p {
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 30px;
}

.development-features {
  display: flex;
  flex-direction: column;
  gap: 15px;
  margin-bottom: 30px;
}

.dev-feature {
  display: flex;
  align-items: center;
  gap: 10px;
}

.dev-feature i {
  color: var(--secondary-color);
}

.dev-feature span {
  color: var(--text-primary);
  font-weight: 500;
}

.development-actions {
  display: flex;
  gap: 20px;
}

.development-code {
  background-color: #1e1e1e;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow-hover);
}

.code-header {
  background-color: #2d2d2d;
  padding: 15px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #3e3e3e;
}

.code-dots {
  display: flex;
  gap: 8px;
}

.code-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.code-dot.red {
  background-color: #ff5f57;
}

.code-dot.yellow {
  background-color: #febc2e;
}

.code-dot.green {
  background-color: #28c840;
}

.code-header span {
  color: #cccccc;
  font-family: monospace;
  font-size: 0.9rem;
}

.development-code pre {
  margin: 0;
  padding: 25px;
  overflow-x: auto;
}

.development-code code {
  color: #d4d4d4;
  font-family: "Courier New", monospace;
  font-size: 0.9rem;
  line-height: 1.6;
}

/* 扩展程序安全 */
.security-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
  margin-top: 50px;
}

.security-feature {
  display: flex;
  align-items: flex-start;
  gap: 20px;
}

.security-icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background-color: var(--primary-color);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.security-content h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.security-content p {
  color: var(--text-secondary);
  line-height: 1.7;
}

.security-tips {
  margin-top: 60px;
  background-color: var(--bg-light);
  padding: 40px;
  border-radius: var(--border-radius);
}

.security-tips h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 25px;
  color: var(--text-primary);
}

.security-tips ul {
  list-style: none;
  padding-left: 0;
}

.security-tips li {
  padding-left: 30px;
  position: relative;
  margin-bottom: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.security-tips li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--secondary-color);
  font-weight: bold;
}

/* 扩展程序常见问题 */
.extensions-faq {
  background-color: var(--bg-light);
}

/* 常见问题页面特有样式 */
.faq-hero {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 100px 0;
  text-align: center;
}

.faq-title {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: 20px;
}

.faq-subtitle {
  font-size: 1.3rem;
  max-width: 800px;
  margin: 0 auto 40px;
  opacity: 0.9;
}

.faq-search {
  max-width: 700px;
  margin: 0 auto;
}

.search-tips {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 15px;
  flex-wrap: wrap;
  margin-top: 20px;
}

.search-tips span {
  opacity: 0.8;
}

.search-tips a {
  color: white;
  text-decoration: none;
  padding: 8px 20px;
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: 20px;
  font-size: 0.9rem;
  transition: var(--transition);
  backdrop-filter: blur(10px);
}

.search-tips a:hover {
  background-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-3px);
}

/* 问题分类导航 */
.categories-nav {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 20px;
  margin-top: 30px;
}

.category-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 25px 15px;
  background-color: var(--bg-white);
  border-radius: var(--border-radius);
  text-decoration: none;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 2px solid transparent;
}

.category-link:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-hover);
  border-color: var(--primary-color);
}

.category-icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background-color: var(--primary-color);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 15px;
}

.category-link span {
  color: var(--text-primary);
  font-weight: 600;
  font-size: 1rem;
  text-align: center;
}

/* 常见问题区域 */
.faq-section {
  padding: 80px 0;
}

.faq-section:nth-child(even) {
  background-color: var(--bg-light);
}

.faq-section .section-title {
  display: flex;
  align-items: center;
  gap: 15px;
  justify-content: flex-start;
  text-align: left;
  margin-bottom: 40px;
}

.faq-section .section-title i {
  color: var(--primary-color);
  font-size: 2rem;
}

/* 未找到答案区域 */
.not-found-answer {
  padding: 100px 0;
  text-align: center;
}

.not-found-content h2 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.not-found-content p {
  color: var(--text-secondary);
  font-size: 1.2rem;
  max-width: 800px;
  margin: 0 auto 50px;
}

.help-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
  margin-top: 50px;
}

.help-option {
  background-color: var(--bg-white);
  border-radius: var(--border-radius);
  padding: 40px 30px;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.help-option:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-hover);
}

.help-icon {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background-color: var(--primary-color);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin: 0 auto 25px;
}

.help-option h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 15px;
  color: var(--text-primary);
}

.help-option p {
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 25px;
  font-size: 1rem;
}

/* 响应式调整 */
@media (max-width: 992px) {
  .development-content {
    grid-template-columns: 1fr;
  }

  .development-code {
    order: -1;
  }
}

@media (max-width: 768px) {
  .download-title,
  .extensions-title,
  .faq-title {
    font-size: 2.5rem;
  }

  .platform-cards,
  .mobile-platforms {
    grid-template-columns: 1fr;
  }

  .tab-buttons {
    flex-direction: column;
  }

  .requirements-table {
    font-size: 0.9rem;
  }

  .installation-step {
    flex-direction: column;
    gap: 15px;
    text-align: center;
  }

  .installation-step .step-content {
    text-align: left;
  }

  .development-actions {
    flex-direction: column;
  }

  .help-options {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .download-title,
  .extensions-title,
  .faq-title {
    font-size: 2rem;
  }

  .version-info {
    flex-direction: column;
    gap: 15px;
  }

  .search-box {
    flex-direction: column;
    border-radius: var(--border-radius);
  }

  .search-box input {
    padding: 15px 20px;
  }

  .search-btn {
    padding: 15px;
    border-radius: 0 0 var(--border-radius) var(--border-radius);
  }

  .extensions-grid,
  .categories-grid {
    grid-template-columns: 1fr;
  }

  .categories-nav {
    grid-template-columns: repeat(2, 1fr);
  }
}