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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #000;
}

/* 链接样式 */
a:not(.nav-link, .aiv_btn-cta) {
  color: #3b82f6  !important;
  text-decoration: none  !important;
  transition: all 0.3s ease  !important;
}

a:hover {
  &:not(.nav-link, .aiv_btn-cta) {
    color: #1d4ed8  !important;
    text-decoration: none  !important;
  }
}

/* FAQ部分链接样式 */
.aiv_faq-answer a {
  font-weight: 500;
  border-bottom: 1px dashed #3b82f6;
}

.aiv_faq-answer a:hover {
  color: #1d4ed8;
  border-bottom: 1px solid #1d4ed8;
  text-decoration: none;
}

/* 评论部分链接样式 */
.aiv_review-card a {
  font-weight: 500;
  background-color: rgba(59, 130, 246, 0.1);
  padding: 0 4px;
  border-radius: 3px;
}

.aiv_review-card a:hover {
  color: #fff;
  background-color: #3b82f6;
  text-decoration: none;
}

.aiv_container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.aiv_header {
  background: #fff;
  padding: 1rem 0;
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.aiv_header .aiv_container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.aiv_btn-secondary {
  text-decoration: none;
  color: #333;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  transition: all 0.3s ease;
  border: 1px solid transparent;
}

.aiv_btn-secondary:hover {
  background-color: #f5f5f5;
  border-color: #e5e7eb;
  transform: translateY(-1px);
}

.aiv_btn-primary {
  text-decoration: none;
  background: #000;
  color: #fff;
  padding: 0.75rem 1.5rem;
  border-radius: 6px;
  font-weight: 600;
  transition: background-color 0.3s;
}

.aiv_btn-primary:hover {
  background: #333;
}

/* Hero Section */
.aiv_hero {
  background: #fff;
  padding: 0 0 80px;
  min-height: calc(100vh - 60px);
  display: flex;
  align-items: flex-start;
  width: 100%;
}

.aiv_hero .aiv_container {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  max-width: none;
  width: 100%;
  gap: 0;
}

.aiv_hero-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.aiv_hero-title {
  margin-top: 80px !important;
  font-size: 4rem !important;
  font-weight: 900 !important;
  line-height: 1.25 !important;
  color: #111827 !important;
  margin-bottom: 1.25rem !important;
  letter-spacing: -0.025em !important;
  text-balance: balance;
  white-space: nowrap !important;
}

.aiv_hero-description {
  margin-top: 1.25rem !important;
  font-size: 1.5rem !important;
  font-weight: 400 !important;
  color: #111827 !important;
  text-align: center !important;
  line-height: 1.75 !important;
  margin-bottom: 2.5rem !important;
}

@media (min-width: 640px) {
  .aiv_hero-description {
    font-size: 1.25rem;
    line-height: 2;
  }
}

.aiv_btn-cta {
  display: inline-block;
  background: #000 !important;
  color: #fff !important;
  padding: 1rem 2rem;
  text-decoration: none !important;
  border-radius: 8px;
  font-weight: 600;
  font-size: 1.1rem;
  transition: all 0.3s !important;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.aiv_btn-cta:hover {
  background: #333;
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
  color: #fff !important;
  text-decoration: none;
}

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

.aiv_image-placeholder {
  width: 100%;
  height: 400px;
  background: #f5f5f5;
  border: 2px dashed #ddd;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  color: #999;
  font-weight: 500;
  text-align: center;
}

/* How to Use Section */
.aiv_how-to-use {
  background: #fff;
  padding: 0 0;
  color: #333;
}

.aiv_section-title {
  font-size: 3rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 4rem;
  color: #333;
}

.aiv_steps-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  grid-template-rows: auto auto;
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.aiv_step-card:nth-child(1) {
  grid-row: 1 / 3;
}

.aiv_step-card:nth-child(2) {
  grid-column: 2;
  grid-row: 1;
}

.aiv_step-card:nth-child(3) {
  grid-column: 2;
  grid-row: 2;
}

.aiv_step-card:nth-child(4) {
  grid-column: 3;
  grid-row: 1 / 3;
}

.aiv_step-card {
  background: #f8f9fa;
  border-radius: 20px;
  padding: 1.5rem;
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
  transition: all 0.3s ease;
  color: #333;
  border: 1px solid #e9ecef;
  display: flex;
  flex-direction: column;
}

.aiv_step-card:nth-child(1),
.aiv_step-card:nth-child(4) {
  padding-bottom: 2rem;
}

.aiv_step-content {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.aiv_step-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.12);
}

.aiv_step-header {
  margin-bottom: 1rem;
}

.aiv_step-header h3 {
  font-size: 1.2rem;
  font-weight: 650;
  color: #667eea;
  margin-bottom: 0.3rem;
}

.aiv_step-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: #333;
}

.aiv_step-description {
  color: #666;
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.aiv_step-visual {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding-top: 0.5rem;
  min-height: 150px;
  margin-top: auto;
}

.aiv_step-card:nth-child(1) .aiv_step-visual,
.aiv_step-card:nth-child(4) .aiv_step-visual {
  align-items: flex-start;
  margin-top: auto;
  padding-top: 0.2rem !important;
}

.aiv_step-image {
  max-width: 100%;
  min-width: 200px;
  height: auto;
  min-height: 150px;
  border-radius: 10px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.1);
  object-fit: contain;
}

.aiv_mockup-phone {
  position: relative;
  width: 280px;
  height: 580px;
  background: #111;
  border-radius: 40px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
  padding: 20px 10px;
  overflow: hidden;
  margin: 0 auto;
}

.aiv_mockup-screen {
  background: #fff;
  width: 100%;
  height: 100%;
  border-radius: 30px;
  overflow: hidden;
  position: relative;
}

.aiv_input-field {
  width: 90%;
  padding: 12px 15px;
  border: 1px solid #ddd;
  border-radius: 8px;
  font-size: 0.9rem;
  margin-bottom: 15px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}

.aiv_generate-button {
  background: linear-gradient(135deg, #6e8efb, #a777e3);
  color: white;
  border: none;
  padding: 12px 25px;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.aiv_generate-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.15);
}

.aiv_arrow-indicator {
  font-size: 1.2rem;
}

.aiv_template-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  width: 80px;
}

.aiv_template-item {
  width: 30px;
  height: 30px;
  background: linear-gradient(45deg, #667eea, #764ba2);
  border-radius: 6px;
}

.aiv_download-preview {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.aiv_preview-image {
  width: 60px;
  height: 40px;
  background: linear-gradient(45deg, #667eea, #764ba2);
  border-radius: 8px;
}

.aiv_download-arrow {
   font-size: 1.5rem;
   color: #667eea;
   font-weight: bold;
 }
 
 @media (max-width: 768px) {
    .aiv_steps-grid {
      grid-template-columns: 1fr;
      grid-template-rows: auto;
      gap: 1.5rem;
      height: auto;
    }
    
    .aiv_step-card:nth-child(1),
    .aiv_step-card:nth-child(2),
    .aiv_step-card:nth-child(3),
    .aiv_step-card:nth-child(4) {
      grid-column: 1;
      grid-row: auto;
    }
    
    .aiv_section-title {
      font-size: 2rem;
    }
    
    .aiv_step-card {
      padding: 1.5rem;
    }
  }

/* Benefits Section */
.aiv_benefits {
  background: #fff;
  padding: 100px 0;
}

.aiv_benefits .text-center {
  text-align: center;
  font-size: 1rem;
  line-height: 1.75;
  font-weight: 600;
  color: #4f46e5;
  margin-bottom: 0.5rem;
}

.aiv_benefits .aiv_section-title {
  margin: 0 auto;
  max-width: 68rem;
  text-align: center;
  font-size: 3rem !important;
  font-weight: 800 !important;
  line-height: 1.2;
  letter-spacing: -0.025em;
  color: #111827;
  margin-bottom: 2rem;
}

@media (min-width: 640px) {
  .benefits .section-title {
    font-size: 3rem;
  }
}

.aiv_benefits-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  margin-top: 3rem;
}

.aiv_benefit-card {
  position: relative;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
  overflow: hidden;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
}

.aiv_benefit-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.aiv_benefit-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin-bottom: 1rem;
}

.aiv_benefit-card h3 {
  font-size: 1.25rem !important;
  font-weight: 600 !important;
  margin-bottom: 0.75rem;
  color: #111827;
  line-height: 1.4;
}

.aiv_benefit-card p {
  color: #4b5563;
  line-height: 1.6;
  font-size: 0.95rem;
  margin-top: 0;
}

/* Modern card layout with image and content */
.benefit-card {
  display: flex;
  flex-direction: column;
  padding: 0;
  text-align: left;
}

.aiv_benefit-card-content {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.aiv_benefit-card-image {
  width: 100%;
  height: 180px;
  overflow: hidden;
  position: relative;
  background: #f3f4f6;
  display: flex;
  align-items: center;
  justify-content: center;
}

.aiv_benefit-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.aiv_benefit-card:hover .aiv_benefit-card-image img {
  transform: scale(1.05);
}

.aiv_benefit-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: #4f46e5;
  background-color: #eef2ff;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  margin-bottom: 0.75rem;
}

@media (max-width: 1024px) {
  .aiv_benefits-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .aiv_benefits-grid {
    grid-template-columns: 1fr;
  }
}

/* Features Section */
.aiv_features {
  background: #f5f5f5;
  padding: 100px 0;
}

.aiv_features-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: stretch;
  min-height: 500px;
}

.aiv_features-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.aiv_feature-item {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
  padding: 2rem;
  background: white;
  border-radius: 16px;
  cursor: pointer;
  transition: all 0.3s ease;
  border: 2px solid transparent;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.aiv_feature-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
}

.aiv_feature-item.active {
  border-color: #667eea;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
}

.aiv_feature-item.active h3,
.aiv_feature-item.active p {
  color: white !important;
}

.aiv_feature-icon {
  width: 60px;
  height: 60px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  background: rgba(102, 126, 234, 0.1);
  flex-shrink: 0;
}

.aiv_feature-item.active .aiv_feature-icon {
  background: rgba(255, 255, 255, 0.2);
}

.aiv_feature-content h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: #000;
}

.aiv_feature-content p {
  color: #666;
  line-height: 1.5;
  font-size: 0.95rem;
  margin: 0;
}

.aiv_features-display {
  position: relative;
  height: 100%;
  min-height: 500px;
  background: white;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.aiv_feature-image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 0.5s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.aiv_feature-image.active {
  opacity: 1;
}

.aiv_feature-img-container {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  overflow: hidden;
  padding: 0;
}

.aiv_feature-img {
  width: 100%;
  height: 100% !important;
  object-fit: cover;
  border-radius: 8px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
  transition: transform 0.3s ease;
}

.aiv_feature-img:hover {
  transform: scale(1.02);
}

/* 确保所有图片都能正确显示和撑满 */
.aiv_feature-img {
  display: block !important;
}



/* Responsive */
@media (max-width: 768px) {
  .aiv_features-container {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .aiv_features-display {
    height: 300px;
  }
  
  .aiv_feature-item {
    padding: 1.5rem;
  }
  
  .aiv_speed-demo .aiv_demo-content {
    flex-direction: column;
    gap: 1rem;
  }
  
  .aiv_scale-comparison {
    gap: 2rem;
  }
}

/* Reviews Section */
.aiv_reviews {
  background: #fff;
  padding: 100px 0;
}

.aiv_reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
}

.aiv_review-card {
  background: #f5f5f5;
  padding: 2rem;
  border-radius: 16px;
  transition: transform 0.3s;
}

.aiv_review-card:hover {
  transform: translateY(-3px);
}

.aiv_reviewer {
  display: flex;
  align-items: center;
  margin-bottom: 1.5rem;
}

.aiv_avatar {
  width: 50px;
  height: 50px;
  background: #000;
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  margin-right: 1rem;
}

.aiv_reviewer-info h4 {
  font-weight: 700;
  color: #000;
}

.aiv_reviewer-info p {
  color: #666;
  font-size: 0.9rem;
}

.aiv_review-card > p {
  color: #333;
  line-height: 1.6;
  font-style: italic;
}

/* CTA Section */
.aiv_cta-section {
  background: #f5f5f5;
  padding: 100px 0;
  text-align: center;
}

.aiv_cta-section h2 {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 1.5rem;
  color: #000;
}

.aiv_cta-section p {
  font-size: 1.25rem;
  color: #666;
  margin-bottom: 2.5rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* FAQ Section */
.aiv_faq {
  background: #fff;
  padding: 100px 0;
}

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

.aiv_faq-item {
  border-bottom: 1px solid #eee;
  margin-bottom: 1rem;
}

.aiv_faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 0;
  cursor: pointer;
  transition: color 0.3s;
}

.aiv_faq-question:hover {
  color: #666;
}

.aiv_faq-question h3 {
  font-size: 1.25rem;
  font-weight: 600;
}

.aiv_faq-toggle {
  font-size: 1.5rem;
  font-weight: bold;
  color: #000;
}

.aiv_faq-answer {
  display: none;
  padding-bottom: 1.5rem;
  color: #666;
  line-height: 1.6;
}

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





/* Responsive Design */
@media (max-width: 768px) {
  .aiv_nav-menu {
    display: none;
  }

  .aiv_hero .aiv_container {
    gap: 48px;
    padding: 0 15px;
  }

  .aiv_hero-title {
    font-size: 2.5rem;
    white-space: normal;
  }

  .aiv_hero-description {
    font-size: 1rem;
  }

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

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

  .aiv_step-card:nth-child(1),
  .aiv_step-card:nth-child(2),
  .aiv_step-card:nth-child(3),
  .aiv_step-card:nth-child(4) {
    grid-column: 1;
    grid-row: auto;
  }

  .aiv_step-image {
    min-width: 200px;
    min-height: 150px;
  }

  .aiv_step-item {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .aiv_benefits-grid,
  .aiv_features-grid,
  .aiv_reviews-grid {
    grid-template-columns: 1fr;
  }

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

}

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

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

  .aiv_hero-description {
    font-size: 1.1rem;
  }
}