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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #fff;
}

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

/* 导航栏 */
.navbar {
  background: #fff;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  transition: all 0.3s ease;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-logo a {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.nav-logo .logo-img {
  width: 40px;
  height: 40px;
  object-fit: contain;
}

.nav-logo h2,
.nav-logo span {
  color: #2563eb;
  font-size: 1.8rem;
  font-weight: 700;
  margin: 0;
}

.nav-menu {
  display: flex;
  list-style: none;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  text-decoration: none;
  color: #64748b;
  font-weight: 500;
  transition: color 0.3s ease;
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: #2563eb;
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 100%;
  height: 2px;
  background: #2563eb;
}

.lang-toggle {
  background: #f1f5f9;
  border: none;
  padding: 8px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 500;
  color: #475569;
  transition: all 0.3s ease;
}

.lang-toggle:hover {
  background: #e2e8f0;
  color: #2563eb;
}

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

.bar {
  width: 25px;
  height: 3px;
  background: #333;
  margin: 3px 0;
  transition: 0.3s;
}

/* 按钮样式 */
.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  text-align: center;
  transition: all 0.3s ease;
  border: 2px solid transparent;
  cursor: pointer;
  font-size: 1rem;
}

.btn-primary {
  background: #2563eb;
  color: white;
  border-color: #2563eb;
}

.btn-primary:hover {
  background: #1d4ed8;
  border-color: #1d4ed8;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn-secondary {
  background: transparent;
  color: #2563eb;
  border-color: #2563eb;
}

.btn-secondary:hover {
  background: #2563eb;
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn-outline {
  background: transparent;
  color: #64748b;
  border-color: #cbd5e1;
}

.btn-outline:hover {
  background: #f8fafc;
  border-color: #94a3b8;
  color: #475569;
}

.btn-small {
  padding: 8px 16px;
  font-size: 0.9rem;
}

/* 主页横幅 */
.hero {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 120px 0 80px;
  margin-top: 70px;
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  line-height: 1.2;
}

.hero-subtitle {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  opacity: 0.9;
  line-height: 1.6;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

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

.logo {
  width: 100px;
  height: 100px;
}

.logo-img {
  width: 40px;
  height: 40px;
  object-fit: contain;
}

.hero-placeholder {
  width: 400px;
  height: 300px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(10px);
}

.hero-placeholder i {
  font-size: 6rem;
  opacity: 0.7;
}

/* 页面标题 */
.page-header {
  background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
  padding: 120px 0 60px;
  margin-top: 70px;
  text-align: center;
}

.page-header h1 {
  font-size: 3rem;
  font-weight: 700;
  color: #1e293b;
  margin-bottom: 1rem;
}

.page-header p {
  font-size: 1.25rem;
  color: #64748b;
  max-width: 600px;
  margin: 0 auto;
}

/* 区块标题 */
.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-header h2 {
  font-size: 2.5rem;
  font-weight: 700;
  color: #1e293b;
  margin-bottom: 1rem;
}

.section-header p {
  font-size: 1.125rem;
  color: #64748b;
  max-width: 600px;
  margin: 0 auto;
}

/* 功能特色 */
.features {
  padding: 80px 0;
  background: #f8fafc;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.feature-card {
  background: white;
  padding: 2rem;
  border-radius: 12px;
  text-align: center;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  transition: all 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.feature-icon {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, #2563eb, #3b82f6);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
}

.feature-icon i {
  font-size: 2rem;
  color: white;
}

.feature-card h3 {
  font-size: 1.5rem;
  font-weight: 600;
  color: #1e293b;
  margin-bottom: 1rem;
}

.feature-card p {
  color: #64748b;
  line-height: 1.6;
}

/* 关于我们 */
.about {
  padding: 80px 0;
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.about-text h2 {
  font-size: 2.5rem;
  font-weight: 700;
  color: #1e293b;
  margin-bottom: 1.5rem;
}

.about-text p {
  color: #64748b;
  margin-bottom: 1.5rem;
  line-height: 1.7;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-top: 2rem;
}

.stat-item {
  text-align: center;
}

.stat-item h3 {
  font-size: 2.5rem;
  font-weight: 700;
  color: #2563eb;
  margin-bottom: 0.5rem;
}

.stat-item p {
  color: #64748b;
  font-weight: 500;
}

.about-image {
  display: flex;
  justify-content: center;
  align-items: center;
}

.about-placeholder {
  width: 400px;
  height: 300px;
  background: linear-gradient(135deg, #f1f5f9, #e2e8f0);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-placeholder i {
  font-size: 6rem;
  color: #94a3b8;
}

/* CTA区域 */
.cta {
  background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
  color: white;
  padding: 80px 0;
  text-align: center;
}

.cta-content h2 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.cta-content p {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  opacity: 0.9;
}

.cta-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* 页脚 */
.footer {
  background: #1e293b;
  color: white;
  padding: 60px 0 20px;
}

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

.footer-section h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: #2563eb;
}

.footer-section h4 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: #e2e8f0;
}

.footer-section p {
  color: #94a3b8;
  margin-bottom: 1rem;
  line-height: 1.6;
}

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

.footer-section ul li {
  margin-bottom: 0.5rem;
}

.footer-section ul li a {
  color: #94a3b8;
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer-section ul li a:hover {
  color: #2563eb;
}

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

.social-links a {
  width: 40px;
  height: 40px;
  background: #334155;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #94a3b8;
  text-decoration: none;
  transition: all 0.3s ease;
}

.social-links a:hover {
  background: #2563eb;
  color: white;
  transform: translateY(-2px);
}

.contact-info p {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.contact-info i {
  color: #2563eb;
  width: 16px;
}

.footer-bottom {
  border-top: 1px solid #334155;
  padding-top: 2rem;
  text-align: center;
  color: #94a3b8;
}

/* 功能详情页面 */
.features-detailed {
  padding: 80px 0;
}

.feature-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  margin-bottom: 6rem;
}

.feature-detail.reverse {
  direction: rtl;
}

.feature-detail.reverse > * {
  direction: ltr;
}

.feature-icon-large {
  width: 100px;
  height: 100px;
  background: linear-gradient(135deg, #2563eb, #3b82f6);
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 2rem;
}

.feature-icon-large i {
  font-size: 3rem;
  color: white;
}

.feature-detail h2 {
  font-size: 2.25rem;
  font-weight: 700;
  color: #1e293b;
  margin-bottom: 1.5rem;
}

.feature-detail p {
  color: #64748b;
  font-size: 1.125rem;
  line-height: 1.7;
  margin-bottom: 2rem;
}

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

.feature-list li {
  color: #64748b;
  margin-bottom: 0.75rem;
  padding-left: 1.5rem;
  position: relative;
}

.feature-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: #10b981;
  font-weight: bold;
}

.feature-image {
  display: flex;
  justify-content: center;
  align-items: center;
}

.feature-placeholder {
  width: 400px;
  height: 300px;
  background: linear-gradient(135deg, #f1f5f9, #e2e8f0);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-placeholder i {
  font-size: 6rem;
  color: #94a3b8;
}

/* 技术特性 */
.tech-features {
  padding: 80px 0;
  background: #f8fafc;
}

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

.tech-card {
  background: white;
  padding: 2rem;
  border-radius: 12px;
  text-align: center;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  transition: all 0.3s ease;
}

.tech-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.tech-card i {
  font-size: 3rem;
  color: #2563eb;
  margin-bottom: 1.5rem;
}

.tech-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: #1e293b;
  margin-bottom: 1rem;
}

.tech-card p {
  color: #64748b;
  line-height: 1.6;
}

/* 价格页面 */
.pricing-toggle {
  padding: 40px 0;
  text-align: center;
}

.toggle-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}

.toggle-label {
  font-weight: 600;
  color: #64748b;
}

.toggle-switch {
  position: relative;
  display: inline-block;
  width: 60px;
  height: 34px;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  transition: 0.4s;
  border-radius: 34px;
}

.slider:before {
  position: absolute;
  content: '';
  height: 26px;
  width: 26px;
  left: 4px;
  bottom: 4px;
  background-color: white;
  transition: 0.4s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: #2563eb;
}

input:checked + .slider:before {
  transform: translateX(26px);
}

.discount-badge {
  background: #10b981;
  color: white;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 600;
}

.pricing-plans {
  padding: 60px 0;
}

.plans-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
  max-width: 1000px;
  margin: 0 auto;
}

.plan-card {
  background: white;
  border-radius: 16px;
  padding: 2.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  transition: all 0.3s ease;
  position: relative;
  border: 2px solid transparent;
}

.plan-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.plan-card.featured {
  border-color: #2563eb;
  transform: scale(1.05);
}

.plan-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: #2563eb;
  color: white;
  padding: 6px 20px;
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 600;
}

.plan-header {
  text-align: center;
  margin-bottom: 2rem;
}

.plan-header h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: #1e293b;
  margin-bottom: 0.5rem;
}

.plan-header p {
  color: #64748b;
}

.plan-price {
  text-align: center;
  margin-bottom: 2rem;
}

.currency {
  font-size: 1.5rem;
  color: #64748b;
  vertical-align: top;
}

.amount {
  font-size: 3rem;
  font-weight: 700;
  color: #1e293b;
}

.period {
  color: #64748b;
  font-size: 1rem;
}

.plan-features ul {
  list-style: none;
  margin-bottom: 2rem;
}

.plan-features li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
  color: #64748b;
}

.plan-features i {
  color: #10b981;
  font-size: 1rem;
}

.plan-action {
  text-align: center;
}

/* 功能对比表格 */
.feature-comparison {
  padding: 80px 0;
  background: #f8fafc;
}

.comparison-table {
  overflow-x: auto;
}

.comparison-table table {
  width: 100%;
  background: white;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.comparison-table th,
.comparison-table td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid #e2e8f0;
}

.comparison-table th {
  background: #f8fafc;
  font-weight: 600;
  color: #1e293b;
}

.comparison-table td {
  color: #64748b;
}

.text-green {
  color: #10b981;
}

.text-red {
  color: #ef4444;
}

/* FAQ */
.faq {
  padding: 80px 0;
}

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

.faq-item {
  background: white;
  border-radius: 12px;
  margin-bottom: 1rem;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  overflow: hidden;
}

.faq-question {
  padding: 1.5rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background 0.3s ease;
}

.faq-question:hover {
  background: #f8fafc;
}

.faq-question h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: #1e293b;
  margin: 0;
}

.faq-question i {
  color: #64748b;
  transition: transform 0.3s ease;
}

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

.faq-answer {
  padding: 0 1.5rem 1.5rem;
  color: #64748b;
  line-height: 1.6;
  display: none;
}

.faq-item.active .faq-answer {
  display: block;
}

/* 联系页面 */
.contact-info-section {
  padding: 80px 0;
  background: #f8fafc;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.contact-card {
  background: white;
  padding: 2rem;
  border-radius: 12px;
  text-align: center;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  transition: all 0.3s ease;
}

.contact-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.contact-icon {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, #2563eb, #3b82f6);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
}

.contact-icon i {
  font-size: 2rem;
  color: white;
}

.contact-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: #1e293b;
  margin-bottom: 1rem;
}

.contact-card p {
  color: #64748b;
  margin-bottom: 0.5rem;
}

/* 联系表单 */
.contact-form-section {
  padding: 80px 0;
}

.form-container {
  max-width: 800px;
  margin: 0 auto;
  background: white;
  padding: 3rem;
  border-radius: 16px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.form-header {
  text-align: center;
  margin-bottom: 3rem;
}

.form-header h2 {
  font-size: 2rem;
  font-weight: 700;
  color: #1e293b;
  margin-bottom: 1rem;
}

.form-header p {
  color: #64748b;
  font-size: 1.125rem;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.form-group {
  display: flex;
  flex-direction: column;
}

.form-group label {
  font-weight: 600;
  color: #374151;
  margin-bottom: 0.5rem;
}

.form-group input,
.form-group select,
.form-group textarea {
  padding: 12px 16px;
  border: 2px solid #e5e7eb;
  border-radius: 8px;
  font-size: 1rem;
  transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: #2563eb;
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.checkbox-group {
  flex-direction: row;
  align-items: center;
  gap: 0.75rem;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  font-size: 0.9rem;
  color: #64748b;
}

.checkbox-label input[type='checkbox'] {
  width: 18px;
  height: 18px;
  margin: 0;
}

.form-actions {
  text-align: center;
  margin-top: 1rem;
}

/* 地图区域 */
.map-section {
  padding: 80px 0;
  background: #f8fafc;
}

.map-container {
  height: 400px;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.map-placeholder {
  height: 100%;
  background: linear-gradient(135deg, #e2e8f0, #cbd5e1);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #64748b;
}

.map-placeholder i {
  font-size: 4rem;
  margin-bottom: 1rem;
}

/* 其他联系方式 */
.other-contact {
  padding: 80px 0;
}

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

.method-card {
  background: white;
  padding: 2rem;
  border-radius: 12px;
  text-align: center;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  transition: all 0.3s ease;
}

.method-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.method-icon {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, #10b981, #059669);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
}

.method-icon i {
  font-size: 2rem;
  color: white;
}

.method-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: #1e293b;
  margin-bottom: 1rem;
}

.method-card p {
  color: #64748b;
  margin-bottom: 1rem;
}

.qr-placeholder {
  width: 120px;
  height: 120px;
  background: #f1f5f9;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 1rem auto;
}

.qr-placeholder i {
  font-size: 3rem;
  color: #94a3b8;
}

/* 隐私政策页面 */
.privacy-content {
  padding: 80px 0;
  background: #f8f9fa;
}

.privacy-section {
  background: white;
  padding: 40px;
  margin-bottom: 30px;
  border-radius: 12px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.privacy-section h2 {
  color: #2c3e50;
  font-size: 1.5rem;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid #3498db;
}

.privacy-section p {
  color: #555;
  line-height: 1.8;
  margin-bottom: 15px;
}

.privacy-section ul {
  margin: 20px 0;
  padding-left: 20px;
}

.privacy-section li {
  color: #555;
  line-height: 1.8;
  margin-bottom: 10px;
}

.privacy-section .contact-info {
  background: #f8f9fa;
  padding: 20px;
  border-radius: 8px;
  margin-top: 20px;
}

.privacy-section .contact-info p {
  margin-bottom: 10px;
}

.privacy-section .last-updated {
  text-align: center;
  font-style: italic;
  color: #666;
  margin-top: 30px;
  padding-top: 20px;
  border-top: 1px solid #eee;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    left: -100%;
    top: 70px;
    flex-direction: column;
    background-color: white;
    width: 100%;
    text-align: center;
    transition: 0.3s;
    box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
    padding: 2rem 0;
  }

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

  .hamburger {
    display: flex;
  }

  .hamburger.active .bar:nth-child(2) {
    opacity: 0;
  }

  .hamburger.active .bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }

  .hamburger.active .bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }

  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 2rem;
  }

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

  .hero-buttons {
    justify-content: center;
  }

  .about-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .feature-detail {
    grid-template-columns: 1fr;
    gap: 2rem;
    text-align: center;
  }

  .feature-detail.reverse {
    direction: ltr;
  }

  .stats {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .toggle-container {
    flex-direction: column;
    gap: 0.5rem;
  }

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

  .hero-placeholder,
  .about-placeholder,
  .feature-placeholder {
    width: 100%;
    max-width: 300px;
    height: 200px;
  }

  .page-header h1 {
    font-size: 2rem;
  }

  .section-header h2 {
    font-size: 2rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 15px;
  }

  .hero {
    padding: 100px 0 60px;
  }

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

  .hero-subtitle {
    font-size: 1.125rem;
  }

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

  .form-container {
    padding: 2rem 1.5rem;
  }

  .plans-grid {
    grid-template-columns: 1fr;
  }

  .plan-card.featured {
    transform: none;
  }

  .comparison-table {
    font-size: 0.875rem;
  }

  .comparison-table th,
  .comparison-table td {
    padding: 0.75rem 0.5rem;
  }

  /* 隐私政策页面响应式 */
  .privacy-section {
    padding: 20px;
    margin-bottom: 20px;
  }

  .privacy-section h2 {
        font-size: 1.3rem;
    }

    /* 导航栏logo响应式 */
    .nav-logo .logo-img {
        width: 32px;
        height: 32px;
    }

    .nav-logo h2,
    .nav-logo span {
        font-size: 1.4rem;
    }

    .nav-logo {
        gap: 8px;
    }

    .nav-logo a {
        gap: 8px;
    }
}