body {
  margin: 0;
  font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', Arial, sans-serif;
  background: #ffffff;
  color: #1e293b;
  padding-top: 70px;
}
.main-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: linear-gradient(90deg, #2563eb 0%, #7c3aed 100%);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  z-index: 1000;
  padding: 15px 0;
  transition: all 0.3s ease;
}
.logo-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}
.logo-img {
  height: 40px;
  width: auto;
}
nav {
  display: flex;
  gap: 30px;
}
nav a {
  color: #ffffff;
  text-decoration: none;
  font-size: 1.1em;
  font-weight: 500;
  transition: color 0.3s ease;
}
nav a:hover {
  color: #38bdf8;
}
.home-section {
  background: linear-gradient(90deg, #2563eb 0%, #7c3aed 100%);
  color: #fff;
  padding: 100px 0 80px 0;
  text-align: center;
}
.home-content h1 {
  font-size: 3.2em;
  margin-bottom: 0.3em;
  font-weight: bold;
  letter-spacing: 0.05em;
}
.home-slogan {
  font-size: 1.5em;
  margin-bottom: 0.8em;
  color: #38bdf8;
}
.home-desc {
  font-size: 1.2em;
  color: #f8f9fa;
}
.pricing-section {
  background: linear-gradient(90deg, #2563eb 0%, #7c3aed 100%);
  color: #fff;
  padding: 80px 0 60px 0;
  text-align: center;
}
.pricing-section h2 {
  margin-top: -10px;
  margin-bottom: 40px;
  color: #ffffff;
  font-size: 2.5em;
  text-align: center;
}
.pricing-cards {
  display: flex;
  justify-content: center;
  gap: 32px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
}
.pricing-card {
  background: #ffffff;
  border-radius: 18px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.08);
  padding: 36px 32px;
  text-align: center;
  transition: transform 0.2s, box-shadow 0.2s;
  border: 2px solid #e0e7ff;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.pricing-card.highlight {
  border: 2px solid #38bdf8;
  box-shadow: 0 8px 32px rgba(56,189,248,0.10);
  transform: scale(1.05);
}
.pricing-card h3 {
  font-size: 1.4em;
  color: #7c3aed;
  margin-bottom: 0.5em;
}
.price {
  font-size: 2em;
  color: #2563eb;
  margin-bottom: 0.7em;
  font-weight: bold;
}
.pricing-card ul {
  list-style: none;
  padding: 0;
  margin: 0 0 1.2em 0;
  color: #22223b;
}
.pricing-card li {
  margin-bottom: 0.5em;
  font-size: 1em;
}
.pricing-card button {
  background: linear-gradient(90deg, #2563eb 0%, #7c3aed 100%);
  color: #ffffff;
  border: none;
  border-radius: 8px;
  padding: 12px 32px;
  font-size: 1.1em;
  font-weight: bold;
  cursor: pointer;
  transition: all 0.2s;
}
.pricing-card button:hover { 
  background: #ffffff;
  color: #7c3aed;
  border: 2px solid #7c3aed;
}
.feedback-section {
  background: #ffffff;
  color: #1e293b;
  padding: 80px 0 60px 0;
  text-align: center;
}
.feedback-section h2 {
  margin-top: -10px;
  margin-bottom: 40px;
  color: #333;
  font-size: 2.5em;
  text-align: center;
}
.feedback-form {
  max-width: 420px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.feedback-form input,
.feedback-form textarea {
  border: 1px solid #e0e7ff;
  border-radius: 8px;
  padding: 14px 16px;
  font-size: 1em;
  background: #ffffff;
  color: #1e293b;
  resize: none;
}
.feedback-form textarea {
  min-height: 100px;
}
.feedback-form button {
  background: linear-gradient(90deg, #2563eb 0%, #7c3aed 100%);
  color: #ffffff;
  border: none;
  border-radius: 8px;
  padding: 12px 0;
  font-size: 1.1em;
  font-weight: bold;
  cursor: pointer;
  transition: all 0.2s;
}
.feedback-form button:hover {
  background: #ffffff;
  color: #7c3aed;
  border: 2px solid #7c3aed;
}
.main-footer {
  background: linear-gradient(90deg, #2563eb 0%, #7c3aed 100%);
  color: #ffffff;
  text-align: center;
  padding: 32px 0 16px 0;
  font-size: 1em;
}
@media (max-width: 900px) {
  .pricing-cards {
    flex-direction: column;
    align-items: center;
    gap: 24px;
  }
  .logo-nav {
    flex-direction: column;
    height: auto;
    gap: 12px;
    padding: 12px 0;
  }
}
@media (max-width: 600px) {
  .main-header {
    padding: 0;
  }
  .logo-img {
    height: 40px;
  }
  .home-section {
    padding: 60px 0 40px 0;
  }
  .home-content h1 {
    font-size: 2em;
  }
  .home-slogan {
    font-size: 1.1em;
  }
  .pricing-card {
    width: 90vw;
    padding: 24px 8px 20px 8px;
  }
  .feedback-form {
    max-width: 98vw;
  }
}
.about-section {
  background: #ffffff;
  color: #1e293b;
  padding: 80px 0 60px 0;
  text-align: center;
}
.about-section h2 {
  margin-top: -10px;
  margin-bottom: 40px;
  color: #333;
  font-size: 2.5em;
  text-align: center;
}
.about-content {
  max-width: 700px;
  margin: 0 auto;
  font-size: 1.2em;
  line-height: 2;
  color: #1e293b;
}
.about-content p {
  margin-bottom: 1.2em;
}
.seller-types {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
}
.seller-card {
  background: #ffffff;
  border-radius: 18px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.08);
  padding: 36px 32px;
  text-align: left;
  transition: transform 0.2s, box-shadow 0.2s;
  border: 2px solid #e0e7ff;
  min-height: 280px;
  display: flex;
  flex-direction: column;
}
.seller-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 32px rgba(124,58,237,0.1);
}
.seller-card h3 {
  font-size: 1.6em;
  color: #7c3aed;
  margin-bottom: 1em;
  text-align: center;
}
.seller-card p {
  font-size: 1.1em;
  line-height: 1.8;
  color: #1e293b;
  margin-bottom: 1em;
}
.contact-section {
  background: linear-gradient(90deg, #2563eb 0%, #7c3aed 100%);
  color: #ffffff;
  padding: 60px 0 40px 0;
  text-align: left;
}
.contact-section h2 {
  font-size: 2.2em;
  margin-bottom: 24px;
  color: #ffffff;
  text-align: center;
}
.contact-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 0 32px;
}
.contact-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.2em;
  margin-left: 0;
}
.contact-item i {
  font-size: 1.4em;
  color: #38bdf8;
  width: 24px;
}
.contact-item span {
  color: #ffffff;
}
.qrcode {
  width: 140px;
  height: 140px;
  border-radius: 12px;
  border: 4px solid #ffffff;
  margin-left: 36px;
}
@media (max-width: 1200px) {
  .seller-types {
    flex-wrap: wrap;
  }
  
  .seller-card {
    width: calc(50% - 24px);
    min-width: 260px;
  }
}
@media (max-width: 768px) {
  .seller-types,
  .contact-content {
    padding: 0 20px;
  }
  
  .seller-card {
    width: 100%;
    min-width: auto;
  }
  
  .contact-item {
    font-size: 1.1em;
  }
  
  .qrcode {
    width: 120px;
    height: 120px;
    margin-left: 24px;
  }
}
.success-message {
  background-color: rgba(255, 255, 255, 0.9);
  color: #7c3aed;
  padding: 15px 30px;
  border-radius: 8px;
  margin-bottom: 20px;
  font-size: 1.1em;
  text-align: center;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  animation: fadeIn 0.3s ease-in-out;
  position: relative;
  top: -20px;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 弹窗样式 */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
}

.modal-content {
  background-color: #fff;
  margin: 15% auto;
  padding: 30px;
  border-radius: 10px;
  width: 90%;
  max-width: 400px;
  text-align: center;
  position: relative;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.close {
  position: absolute;
  right: 20px;
  top: 15px;
  font-size: 28px;
  font-weight: bold;
  color: #666;
  cursor: pointer;
}

.close:hover {
  color: #333;
}

.modal-content h3 {
  color: #333;
  margin-bottom: 15px;
  font-size: 1.5em;
}

.modal-content p {
  color: #666;
  margin-bottom: 20px;
}

.modal-qrcode {
  width: 200px;
  height: 200px;
  margin: 0 auto;
  display: block;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

@media (max-width: 768px) {
  .modal-content {
    margin: 30% auto;
    padding: 20px;
  }
  
  .modal-qrcode {
    width: 180px;
    height: 180px;
  }
}

/* 平板设备 (768px - 1024px) */
@media (max-width: 1024px) {
  .main-header {
    padding: 15px 20px;
  }

  .logo-img {
    height: 30px;
  }

  nav a {
    font-size: 0.9em;
    margin-left: 20px;
  }

  .home-content h1 {
    font-size: 2.8em;
  }

  .home-slogan {
    font-size: 1.4em;
  }

  .home-desc {
    font-size: 1.1em;
  }

  .seller-types {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    padding: 0 24px;
  }
  
  .pricing-cards {
    gap: 24px;
    padding: 0 24px;
  }

  .seller-card,
  .pricing-card {
    padding: 28px 24px;
  }

  .pricing-card.highlight {
    transform: scale(1.05);
  }

  .feedback-form {
    max-width: 500px;
    padding: 30px;
  }

  .contact-content {
    padding: 0 20px;
  }
}

/* 手机设备 (小于 768px) */
@media (max-width: 768px) {
  .main-header {
    padding: 10px 0;
  }
  
  .logo-nav {
    flex-direction: column;
    gap: 10px;
  }
  
  nav {
    gap: 15px;
  }
  
  nav a {
    font-size: 1em;
  }
  
  body {
    padding-top: 100px;
  }

  .home-content {
    padding: 60px 20px;
  }

  .home-content h1 {
    font-size: 2.2em;
  }

  .home-slogan {
    font-size: 1.2em;
  }

  .home-desc {
    font-size: 1em;
    max-width: 100%;
  }

  .about-section h2,
  .pricing-section h2,
  .feedback-section h2 {
    font-size: 2em;
    margin-bottom: 30px;
  }

  .seller-types {
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 0 20px;
    max-width: 500px;
  }
  
  .pricing-cards {
    flex-direction: column;
    align-items: center;
    gap: 20px;
    padding: 0 20px;
    max-width: 500px;
  }

  .seller-card,
  .pricing-card {
    padding: 24px 20px;
    min-height: auto;
  }

  .seller-card h3,
  .pricing-card h3 {
    font-size: 1.4em;
    margin-bottom: 16px;
  }

  .seller-card p {
    font-size: 1em;
    line-height: 1.6;
  }

  .price {
    font-size: 2em;
    margin-bottom: 16px;
  }

  .pricing-card ul {
    margin-bottom: 20px;
  }

  .pricing-card li {
    font-size: 0.95em;
    margin-bottom: 8px;
  }

  .pricing-card button {
    padding: 10px 24px;
    font-size: 1em;
  }

  .pricing-card.highlight {
    transform: none;
    order: -1;
  }

  .feedback-form {
    max-width: 100%;
    padding: 20px;
  }

  .feedback-form input,
  .feedback-form textarea {
    font-size: 0.9em;
  }

  .contact-content {
    padding: 0 15px;
  }

  .contact-item {
    margin-bottom: 15px;
  }

  .qrcode {
    width: 120px;
    height: 120px;
  }

  /* 弹窗样式调整 */
  .modal-content {
    width: 90%;
    max-width: 320px;
    padding: 20px;
    margin: 30% auto;
  }

  .modal-qrcode {
    width: 160px;
    height: 160px;
  }

  /* 成功消息样式调整 */
  .success-message {
    font-size: 1em;
    padding: 12px 20px;
    margin-bottom: 15px;
  }
}

/* 小屏手机设备 (小于 480px) */
@media (max-width: 480px) {
  .home-content h1 {
    font-size: 1.8em;
  }

  .home-slogan {
    font-size: 1.1em;
  }

  nav a {
    font-size: 0.8em;
    margin: 0 5px;
    padding: 4px 8px;
  }

  .seller-card h3,
  .pricing-card h3 {
    font-size: 1.3em;
  }

  .price {
    font-size: 1.8em;
  }

  .contact-item {
    font-size: 0.9em;
  }

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

  .seller-types {
    padding: 0 16px;
  }
  
  .pricing-cards {
    padding: 0 16px;
  }

  .seller-card,
  .pricing-card {
    padding: 20px 16px;
  }

  .pricing-card button {
    padding: 8px 20px;
    font-size: 0.95em;
  }
}