/* 全局样式 */
:root {
  --primary-color: #4361ee;
  --secondary-color: #3a0ca3;
  --accent-color: #f72585;
  --dark-color: #2b2d42;
  --light-color: #f8f9fa;
  --gray-color: #6c757d;
  --gray-light: #e9ecef;
  --gray-dark: #495057;
  --success-color: #4cc9f0;
  --warning-color: #fca311;
  --danger-color: #f72585;
  --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  --transition: all 0.3s ease;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --border-radius: 8px;
  --border-radius-lg: 12px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  color: var(--dark-color);
  background-color: var(--light-color);
  overflow-x: hidden;
}

/* 容器 */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 按钮 */
.btn {
  display: inline-block;
  padding: 12px 24px;
  border: none;
  border-radius: var(--border-radius);
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  outline: none;
  position: relative;
  overflow: hidden;
}

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

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

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

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

.btn-lg {
  padding: 16px 32px;
  font-size: 18px;
}

/* 导航栏 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: rgba(255, 255, 255, 0.95);
  box-shadow: var(--shadow);
  z-index: 1000;
  transition: var(--transition);
}

.navbar.scrolled {
  background-color: white;
  box-shadow: var(--shadow-lg);
}

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

.navbar-brand {
  display: flex;
  align-items: center;
  text-decoration: none;
  color: var(--dark-color);
}

.navbar-brand .logo {
  width: 40px;
  height: 40px;
  margin-right: 10px;
}

.navbar-brand span {
  font-size: 24px;
  font-weight: 700;
  color: var(--primary-color);
}

.navbar-menu {
  display: flex;
  align-items: center;
}

.navbar-nav {
  display: flex;
  list-style: none;
  margin-right: 30px;
}

.navbar-nav li {
  margin-left: 20px;
}

.navbar-nav a {
  text-decoration: none;
  color: var(--dark-color);
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

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

.navbar-nav a.active::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--primary-color);
}

.navbar-toggle {
  display: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--dark-color);
}

/* 英雄区域 */
.hero {
  padding: 120px 0 80px;
  background: linear-gradient(135deg, var(--dark-color) 0%, var(--secondary-color) 100%);
  color: white;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMTAwJSIgaGVpZ2h0PSIxMDAlIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjxkZWZzPjxwYXR0ZXJuIGlkPSJwYXR0ZXJuXzAiIHBhdHRlcm5Vbml0cz0idXNlclNwYWNlT25Vc2UiIHdpZHRoPSI2MCIgaGVpZ2h0PSI2MCIgcGF0dGVyblRyYW5zZm9ybT0icm90YXRlKDQ1KSI+PHBhdGggZD0iTSA2MCAwIEwgMCAwIDAgNjAiIGZpbGw9Im5vbmUiIHN0cm9rZT0iI2ZmZiIgc3Ryb2tlLXdpZHRoPSIwLjUiIHN0cm9rZS1saW5lY2FwPSJyb3VuZCIvPjwvcGF0dGVybj48L2RlZnM+PHJlY3Qgd2lkdGg9IjEwMCUiIGhlaWdodD0iMTAwJSIgZmlsbD0idXJsKCNwYXR0ZXJuXzApIiAvPjwvc3ZnPg==');
  opacity: 0.1;
}

.hero .container {
  display: flex;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-content {
  flex: 1;
  margin-right: 40px;
}

.hero-title {
  font-size: 48px;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 20px;
}

.hero-title .highlight {
  color: var(--success-color);
}

.hero-subtitle {
  font-size: 20px;
  margin-bottom: 40px;
  opacity: 0.9;
}

.hero-cta {
  display: flex;
  gap: 20px;
  margin-bottom: 40px;
}

.hero-features {
  display: flex;
  gap: 30px;
  flex-wrap: wrap;
}

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

.feature-item i {
  font-size: 20px;
  color: var(--success-color);
}

.hero-image {
  flex: 1;
  text-align: right;
}

.hero-image img {
  width: 100%;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
}

/* 通用章节样式 */
section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-header h2 {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--dark-color);
}

.section-header p {
  font-size: 18px;
  color: var(--gray-color);
  max-width: 700px;
  margin: 0 auto;
}

/* 核心功能 */
.features {
  background-color: var(--light-color);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.feature-card {
  background-color: white;
  padding: 40px;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow);
  transition: var(--transition);
  text-align: center;
}

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

.feature-icon {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 30px;
  color: white;
  font-size: 32px;
  box-shadow: var(--shadow);
}

.feature-card h3 {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--dark-color);
}

.feature-card p {
  color: var(--gray-color);
  line-height: 1.6;
}

/* 核心亮点 */
.highlights {
  background-color: white;
}

.highlight-item {
  display: flex;
  align-items: center;
  margin-bottom: 100px;
}

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

.highlight-item.reverse {
  flex-direction: row-reverse;
}

.highlight-content {
  flex: 1;
  padding: 0 40px;
}

.highlight-content h2 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--dark-color);
}

.highlight-content p {
  font-size: 18px;
  color: var(--gray-color);
  margin-bottom: 30px;
  line-height: 1.6;
}

.highlight-content ul {
  list-style: none;
}

.highlight-content li {
  display: flex;
  align-items: center;
  margin-bottom: 15px;
  font-size: 16px;
  color: var(--dark-color);
}

.highlight-content li i {
  color: var(--success-color);
  margin-right: 15px;
  font-size: 20px;
}

.highlight-image {
  flex: 1;
}

.highlight-image img {
  width: 100%;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
}

/* 免费版优势 */
.free-version {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
}

.free-version .section-header h2 {
  color: white;
}

.free-version .section-header p {
  color: rgba(255, 255, 255, 0.8);
}

.free-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
}

.free-feature-item {
  text-align: center;
  padding: 30px;
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius-lg);
  backdrop-filter: blur(10px);
  transition: var(--transition);
}

.free-feature-item:hover {
  transform: translateY(-10px);
  background-color: rgba(255, 255, 255, 0.15);
}

.free-feature-item i {
  font-size: 48px;
  margin-bottom: 20px;
  color: var(--success-color);
}

.free-feature-item h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 15px;
}

.free-feature-item p {
  font-size: 16px;
  line-height: 1.6;
  opacity: 0.9;
}

/* 安全保障 */
.security {
  background-color: var(--light-color);
}

.security-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
}

.security-feature-item {
  text-align: center;
  padding: 40px;
  background-color: white;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.security-feature-item:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-lg);
}

.security-feature-item i {
  font-size: 48px;
  margin-bottom: 20px;
  color: var(--primary-color);
}

.security-feature-item h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 15px;
  color: var(--dark-color);
}

.security-feature-item p {
  font-size: 16px;
  line-height: 1.6;
  color: var(--gray-color);
}

/* 下载区域 */
.download {
  background-color: var(--dark-color);
  color: white;
  text-align: center;
}

.download-content h2 {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 20px;
}

.download-content p {
  font-size: 18px;
  margin-bottom: 40px;
  opacity: 0.9;
}

.download-buttons {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

/* 页脚 */
.footer {
  background-color: var(--dark-color);
  color: white;
  padding-top: 80px;
  padding-bottom: 40px;
}

.footer .container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 40px;
}

.footer-brand {
  text-align: center;
}

.footer-brand .logo {
  width: 60px;
  height: 60px;
  margin-bottom: 20px;
}

.footer-brand h3 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 15px;
  color: var(--success-color);
}

.footer-brand p {
  font-size: 16px;
  line-height: 1.6;
  opacity: 0.8;
}

.footer-links h4 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--success-color);
}

.footer-links ul {
  list-style: none;
}

.footer-links li {
  margin-bottom: 15px;
}

.footer-links a {
  text-decoration: none;
  color: rgba(255, 255, 255, 0.8);
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-links a:hover {
  color: var(--success-color);
  transform: translateX(5px);
}

.footer-bottom {
  margin-top: 60px;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-bottom p {
  opacity: 0.8;
}

.footer-social {
  display: flex;
  gap: 20px;
}

.footer-social a {
  color: rgba(255, 255, 255, 0.8);
  font-size: 20px;
  transition: var(--transition);
}

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

/* 功能特性页面 */
.features-page {
  background-color: var(--light-color);
}

.features-category {
  padding: 80px 0;
  margin-bottom: 0;
  background-color: white;
}

.features-category:nth-child(even) {
  background-color: var(--light-color);
}

.features-category h2 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 40px;
  color: var(--dark-color);
  text-align: center;
}

.features-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.features-list .feature-card {
  text-align: left;
}

.features-list .feature-icon {
  margin: 0 0 20px 0;
}

/* 下载页面 */
.download-page {
  background-color: var(--light-color);
}

.download-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 40px;
  margin-bottom: 60px;
}

.download-option {
  background-color: white;
  padding: 40px;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow);
  text-align: center;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

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

.download-option.free::before {
  content: '免费';
  position: absolute;
  top: 20px;
  right: -30px;
  background-color: var(--success-color);
  color: white;
  padding: 5px 40px;
  transform: rotate(45deg);
  font-size: 14px;
  font-weight: 600;
}

.download-option h3 {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--dark-color);
}

.download-option p {
  color: var(--gray-color);
  margin-bottom: 30px;
  line-height: 1.6;
}

.download-option .price {
  font-size: 36px;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 30px;
}

.download-option ul {
  list-style: none;
  margin-bottom: 40px;
  text-align: left;
}

.download-option li {
  display: flex;
  align-items: center;
  margin-bottom: 15px;
  color: var(--dark-color);
}

.download-option li i {
  color: var(--success-color);
  margin-right: 15px;
  font-size: 18px;
}

/* 关于我们页面 */
.about-page {
  background-color: var(--light-color);
}

.about-content {
  background-color: white;
  padding: 60px;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow);
  margin-bottom: 60px;
}

.about-content h2 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 30px;
  color: var(--dark-color);
}

.about-content p {
  font-size: 18px;
  line-height: 1.6;
  color: var(--gray-color);
  margin-bottom: 20px;
}

.team {
  margin-top: 80px;
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 40px;
}

.team-member {
  text-align: center;
  background-color: white;
  padding: 40px;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.team-member:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-lg);
}

.team-member img {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  margin-bottom: 20px;
  object-fit: cover;
}

.team-member h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--dark-color);
}

.team-member p {
  font-size: 16px;
  color: var(--gray-color);
  margin-bottom: 20px;
}

.team-member .social-links {
  display: flex;
  justify-content: center;
  gap: 15px;
}

.team-member .social-links a {
  color: var(--gray-color);
  font-size: 18px;
  transition: var(--transition);
}

.team-member .social-links a:hover {
  color: var(--primary-color);
  transform: translateY(-3px);
}

/* 页面标题 */
.page-header {
  background: linear-gradient(135deg, var(--dark-color) 0%, var(--secondary-color) 100%);
  color: white;
  padding: 100px 0 60px;
  text-align: center;
}

.page-header h1 {
  font-size: 48px;
  font-weight: 700;
  margin-bottom: 20px;
}

.page-header p {
  font-size: 18px;
  opacity: 0.9;
}

/* 系统要求 */
.system-requirements {
  background-color: var(--light-color);
  padding: 100px 0;
}

.requirements-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
}

.requirement-item {
  background-color: white;
  padding: 30px;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.requirement-item:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-lg);
}

.requirement-item h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--dark-color);
  display: flex;
  align-items: center;
  gap: 15px;
}

.requirement-item h3 i {
  color: var(--primary-color);
}

.requirement-item ul {
  list-style: none;
}

.requirement-item li {
  margin-bottom: 10px;
  color: var(--gray-color);
  display: flex;
  align-items: center;
  gap: 10px;
}

.requirement-item li:before {
  content: '•';
  color: var(--primary-color);
  font-weight: bold;
}

/* 常见问题 */
.faq {
  background-color: white;
  padding: 100px 0;
}

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

.faq-item {
  margin-bottom: 20px;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.faq-item h3 {
  background-color: var(--light-color);
  padding: 20px;
  margin: 0;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 15px;
  font-size: 18px;
  font-weight: 600;
  color: var(--dark-color);
}

.faq-item h3:hover {
  background-color: var(--gray-light);
}

.faq-item h3 i {
  color: var(--primary-color);
}

.faq-item p {
  padding: 20px;
  margin: 0;
  color: var(--gray-color);
  line-height: 1.6;
  background-color: white;
}

/* 联系我们 */
.contact {
  background-color: var(--light-color);
  padding: 100px 0;
}

.contact-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 40px;
}

.contact-info {
  background-color: white;
  padding: 40px;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow);
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  margin-bottom: 30px;
}

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

.contact-item i {
  font-size: 24px;
  color: var(--primary-color);
  margin-top: 5px;
}

.contact-item h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 5px;
  color: var(--dark-color);
}

.contact-item p {
  color: var(--gray-color);
  margin: 0;
}

.contact-form {
  background-color: white;
  padding: 40px;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 10px;
  font-weight: 500;
  color: var(--dark-color);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 15px;
  border: 1px solid var(--gray-light);
  border-radius: var(--border-radius);
  font-size: 16px;
  transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.1);
}

.form-group input.error,
.form-group textarea.error {
  border-color: var(--danger-color);
}

/* 合作伙伴 */
.partners {
  background-color: white;
  padding: 100px 0;
}

.partners-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 40px;
  align-items: center;
  justify-items: center;
}

.partner-item {
  transition: var(--transition);
}

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

.partner-item img {
  width: 120px;
  height: 120px;
  object-fit: contain;
}

/* 价值观 */
.values-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 30px;
}

.value-item {
  text-align: center;
  padding: 30px;
  background-color: var(--light-color);
  border-radius: var(--border-radius-lg);
  transition: var(--transition);
}

.value-item:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-lg);
}

.value-item i {
  font-size: 48px;
  margin-bottom: 20px;
  color: var(--primary-color);
}

.value-item h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 15px;
  color: var(--dark-color);
}

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

/* 暗色模式 */
.dark-mode {
  --dark-color: #f8f9fa;
  --light-color: #2b2d42;
  --gray-color: #e9ecef;
  --gray-light: #495057;
  --gray-dark: #6c757d;
}

.dark-mode .navbar {
  background-color: rgba(43, 45, 66, 0.95);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

.dark-mode .navbar.scrolled {
  background-color: #2b2d42;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.3);
}

.dark-mode .navbar-brand {
  color: var(--dark-color);
}

.dark-mode .navbar-nav a {
  color: var(--dark-color);
}

.dark-mode .navbar-toggle {
  color: var(--dark-color);
}

.dark-mode .feature-card,
.dark-mode .security-feature-item,
.dark-mode .download-option,
.dark-mode .about-content,
.dark-mode .team-member,
.dark-mode .requirement-item,
.dark-mode .faq-item,
.dark-mode .contact-info,
.dark-mode .contact-form {
  background-color: #3a3d5a;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

.dark-mode .feature-card:hover,
.dark-mode .security-feature-item:hover,
.dark-mode .download-option:hover,
.dark-mode .team-member:hover,
.dark-mode .requirement-item:hover,
.dark-mode .faq-item:hover {
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.5);
}

.dark-mode .value-item {
  background-color: #3a3d5a;
}

.dark-mode .value-item:hover {
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.5);
}

.dark-mode .faq-item h3 {
  background-color: #3a3d5a;
}

.dark-mode .faq-item h3:hover {
  background-color: #4a4d6a;
}

.dark-mode .form-group input,
.dark-mode .form-group textarea {
  background-color: #4a4d6a;
  border-color: #5a5d7a;
  color: var(--dark-color);
}

/* 响应式设计 */
@media (max-width: 992px) {
  .hero .container {
    flex-direction: column;
    text-align: center;
  }
  
  .hero-content {
    margin-right: 0;
    margin-bottom: 40px;
  }
  
  .hero-title {
    font-size: 36px;
  }
  
  .hero-cta {
    justify-content: center;
  }
  
  .hero-features {
    justify-content: center;
  }
  
  .highlight-item {
    flex-direction: column;
    text-align: center;
  }
  
  .highlight-content {
    padding: 0;
    margin-bottom: 40px;
  }
  
  .highlight-content ul {
    text-align: left;
    display: inline-block;
  }
  
  .navbar-menu {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    background-color: white;
    box-shadow: var(--shadow);
    padding: 20px;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    transform: translateY(-150%);
    opacity: 0;
    transition: var(--transition);
    z-index: 999;
  }
  
  .navbar-menu.active {
    transform: translateY(0);
    opacity: 1;
  }
  
  .navbar-nav {
    flex-direction: column;
    align-items: center;
    margin-right: 0;
    gap: 15px;
  }
  
  .navbar-nav li {
    margin-left: 0;
  }
  
  .navbar-toggle {
    display: block;
  }
  
  .page-header h1 {
    font-size: 36px;
  }
  
  .contact-content {
    grid-template-columns: 1fr;
  }
  
  .values-grid {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  }
  
  .partners-grid {
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 30px;
  }
  
  .partner-item img {
    width: 100px;
    height: 100px;
  }
}

@media (max-width: 768px) {
  .section-header h2 {
    font-size: 28px;
  }
  
  .section-header p {
    font-size: 16px;
  }
  
  .hero-title {
    font-size: 28px;
  }
  
  .hero-subtitle {
    font-size: 16px;
  }
  
  .hero-cta {
    flex-direction: column;
    align-items: center;
  }
  
  .btn-lg {
    padding: 12px 24px;
    font-size: 16px;
  }
  
  .feature-card {
    padding: 30px;
  }
  
  .free-feature-item,
  .security-feature-item {
    padding: 30px;
  }
  
  .download-content h2 {
    font-size: 28px;
  }
  
  .download-content p {
    font-size: 16px;
  }
  
  .download-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  
  .about-content {
    padding: 40px;
  }
  
  .about-content h2 {
    font-size: 28px;
  }
  
  .about-content p {
    font-size: 16px;
  }
}

@media (max-width: 576px) {
  .hero {
    padding: 100px 0 60px;
  }
  
  section {
    padding: 60px 0;
  }
  
  .hero-title {
    font-size: 24px;
  }
  
  .hero-subtitle {
    font-size: 14px;
  }
  
  .section-header h2 {
    font-size: 24px;
  }
  
  .feature-card {
    padding: 20px;
  }
  
  .free-feature-item,
  .security-feature-item {
    padding: 20px;
  }
  
  .download-option {
    padding: 30px;
  }
  
  .about-content {
    padding: 30px;
  }
  
  .about-content h2 {
    font-size: 24px;
  }
  
  .team-member {
    padding: 30px;
  }
}

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

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

.fade-in-up {
  animation: fadeInUp 0.6s ease forwards;
}

.pulse {
  animation: pulse 2s infinite;
}

/* 滚动动画 */
.scroll-reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: var(--transition);
}

.scroll-reveal.active {
  opacity: 1;
  transform: translateY(0);
}