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

/* 移动端优化 */
html {
  -webkit-text-size-adjust: 100%;
  -ms-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

/* 触摸滚动优化 */
* {
  -webkit-overflow-scrolling: touch;
}

/* 防止移动端双击缩放 */
* {
  touch-action: manipulation;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #ffffff;
  overflow-x: hidden;
}

/* 图片响应式优化 */
img {
  max-width: 100%;
  height: auto;
  display: block;
  border-style: none;
}

/* 表格响应式 */
table {
  width: 100%;
  border-collapse: collapse;
}

/* 输入框移动端优化 */
input,
textarea,
select {
  max-width: 100%;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
}

/* 按钮优化 */
button {
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  cursor: pointer;
}

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

/* Header 样式 */
.header {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 1rem 0;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: 1000;
  width: 100%;
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  font-size: 1.5rem;
  font-weight: 700;
  gap: 0.5rem;
}

.logo i {
  font-size: 2rem;
  color: #ffd700;
}

.nav-tabs {
  display: flex;
  gap: 0.5rem;
}

.tab-btn {
  background: rgba(255, 255, 255, 0.1);
  border: 2px solid rgba(255, 255, 255, 0.2);
  color: white;
  padding: 0.8rem 1.5rem;
  border-radius: 50px;
  cursor: pointer;
  font-weight: 500;
  transition: all 0.3s ease;
  font-size: 1rem;
}

.tab-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.tab-btn.active {
  background: white;
  color: #667eea;
  border-color: white;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

/* Tab Content */
.tab-content {
  display: none;
}

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

/* Hero Section */
.hero-section {
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  padding: 5rem 0;
  min-height: 70vh;
  display: flex;
  align-items: center;
}

.hero-content {
  display: flex;
  align-items: center;
  gap: 3rem;
  flex-wrap: wrap;
}

.hero-text {
  flex: 1;
  min-width: 300px;
  max-width: 600px;
}

.hero-image {
  flex: 1;
  min-width: 300px;
  max-width: 500px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-text h1 {
  font-size: 3.5rem;
  font-weight: 700;
  color: #2c3e50;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, #667eea, #764ba2);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-text h2 {
  font-size: 1.8rem;
  color: #34495e;
  margin-bottom: 1.5rem;
  font-weight: 500;
}

.hero-description {
  font-size: 1.1rem;
  color: #5a6c7d;
  margin-bottom: 2rem;
  line-height: 1.8;
}

.hero-features {
  display: flex;
  gap: 2rem;
  margin-top: 2rem;
}

.feature-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: #667eea;
  font-weight: 500;
}

.feature-item i {
  font-size: 1.2rem;
}

.hero-image img {
  width: 100%;
  height: auto;
  max-width: 100%;
  transition: transform 0.3s ease;
}

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

/* Section Styles */
.product-details,
.usage-hero,
.biofeedback-section,
.system-working,
.ai-prediction,
.breathing-science {
  padding: 2rem 0;
}

.section-header {
  text-align: center;
  margin-bottom: 1.5rem;
}

.section-header h3 {
  font-size: 2.5rem;
  color: #2c3e50;
  margin-bottom: 1rem;
  font-weight: 600;
}

.section-header p {
  font-size: 1.2rem;
  color: #7f8c8d;
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
  margin-bottom: 5rem;
}

.feature-card {
  background: white;
  padding: 2rem;
  border-radius: 20px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
}

.feature-card-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.12);
}

.feature-card h4 {
  font-size: 1.3rem;
  color: #2c3e50;
  margin-bottom: 0;
  font-weight: 600;
}

.feature-card p {
  color: #5a6c7d;
  line-height: 1.8;
  text-align: left;
}

/* Product Showcase */
.product-showcase {
  background: #f8f9fa;
  border-radius: 20px;
  padding: 4rem;
  margin-bottom: 5rem;
}

.showcase-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 3rem;
  align-items: center;
}

.showcase-text h4 {
  font-size: 2rem;
  color: #2c3e50;
  margin-bottom: 1.5rem;
  font-weight: 600;
}

.showcase-text p {
  color: #5a6c7d;
  margin-bottom: 2rem;
  line-height: 1.8;
}

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

.benefits-list li {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 1rem;
  color: #2c3e50;
  font-weight: 500;
}

.benefits-list i {
  color: #27ae60;
  font-size: 1.1rem;
}

.showcase-image img {
  width: 100%;
  border-radius: 15px;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
}

/* Testimonials */
.testimonials h4 {
  font-size: 2rem;
  color: #2c3e50;
  text-align: center;
  margin-bottom: 3rem;
  font-weight: 600;
}

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

.testimonial-card {
  background: white;
  padding: 2rem;
  border-radius: 15px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
  border-left: 4px solid #667eea;
}

.testimonial-content p {
  font-style: italic;
  color: #5a6c7d;
  margin-bottom: 1.5rem;
  line-height: 1.8;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.testimonial-author img {
  width: 50px;
  height: 50px;
  border-radius: 50%;
}

.testimonial-author strong {
  display: block;
  color: #2c3e50;
}

.testimonial-author span {
  color: #7f8c8d;
  font-size: 0.9rem;
}

/* 滚动到顶部按钮 */
.scroll-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: white;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.2rem;
  box-shadow: 0 4px 20px rgba(102, 126, 234, 0.3);
  transition: all 0.3s ease;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.scroll-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.scroll-to-top:hover {
  background: linear-gradient(135deg, #5a6fd8, #6a42a0);
  transform: translateY(-3px);
  box-shadow: 0 6px 25px rgba(102, 126, 234, 0.4);
}

.scroll-to-top:active {
  transform: translateY(-1px);
  box-shadow: 0 3px 15px rgba(102, 126, 234, 0.3);
}

/* Footer */
.footer {
  background: #2c3e50;
  color: white;
  padding: 3rem 0 1rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 3rem;
  margin-bottom: 2rem;
}

.footer-info .logo {
  margin-bottom: 1rem;
}

.footer-info p {
  opacity: 0.8;
}

.footer-contact h4 {
  margin-bottom: 1rem;
  color: #ffd700;
}

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

.footer-contact i {
  width: 20px;
  color: #ffd700;
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid #34495e;
  opacity: 0.8;
}

/* Usage Page Styles */
.usage-hero {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  text-align: center;
  padding: 6rem 0;
}

.usage-intro h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
  font-weight: 700;
}

.usage-intro h2 {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  opacity: 0.9;
  font-weight: 400;
}

.usage-intro p {
  font-size: 1.2rem;
  opacity: 0.8;
  max-width: 800px;
  margin: 0 auto;
  line-height: 1.8;
}

/* Highlight Box (通用组件) */
.highlight-box {
  background: linear-gradient(135deg, #fff3e0, #ffe0b2);
  padding: 1.5rem;
  border-radius: 15px;
  border-left: 4px solid #ff9800;
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* highlight-box 图标样式已移动到统一样式定义中 */

.highlight-box span {
  color: #e65100;
  font-weight: 500;
  line-height: 1.6;
}

/* Working Process */
.working-process {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.process-step {
  background: white;
  padding: 2.5rem;
  border-radius: 20px;
  text-align: center;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
  position: relative;
  border: 1px solid #f8f9fa;
  transition: transform 0.3s ease;
}

.process-step:hover {
  transform: translateY(-5px);
}

.step-number {
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: white;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 1.1rem;
}

.step-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 0 1rem;
}

.step-content-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.step-content h4 {
  font-size: 1.3rem;
  color: #2c3e50;
  margin-bottom: 0;
  font-weight: 600;
  text-align: left;
}

.step-content p {
  color: #5a6c7d;
  line-height: 1.8;
  text-align: left;
}

.step-icon-container,
.flow-icon-container,
.ai-step-icon-container,
.explanation-icon-container,
.feature-icon-container {
  width: 45px;
  height: 45px;
  min-height: 45px;
  min-width: 45px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
  transition: transform 0.3s ease;
}

.step-icon-container {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 1rem;
}

/* 图标样式 - 只负责背景和基本布局 */
.step-icon,
.feature-icon,
.flow-icon,
.ai-step-icon,
.explanation-icon,
.highlight-icon,
.insight-icon {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

/* System Features */
.feature-showcase {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
  gap: 1rem;
  align-items: center;
  background: #f8f9fa;
  padding: 2rem;
  border-radius: 20px;
}

.feature-text h4 {
  font-size: 2rem;
  color: #2c3e50;
  margin-bottom: 1.5rem;
  font-weight: 600;
}

.feature-text p {
  color: #5a6c7d;
  line-height: 1.8;
}

.feature-highlight {
  display: flex;
  flex-direction: row;
  gap: 0.5rem;
  padding: 1rem 0;
}

.highlight-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: white;
  padding: 1rem 1.5rem;
  border-radius: 10px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
  flex: 1;
}

/* highlight-item 图标样式已移动到统一样式定义中 */

.highlight-item span {
  color: #2c3e50;
  font-weight: 500;
}

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

.feature-image img {
  max-height: 300px;
  border-radius: 15px;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
}

/* AI Prediction */
.ai-prediction {
  background: #f8f9fa;
}

.ai-content {
  padding: 1rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 3rem;
  align-items: center;
}

.ai-text h4 {
  font-size: 2.5rem;
  color: #2c3e50;
  margin-bottom: 1.5rem;
  font-weight: 600;
}

.ai-text > p {
  font-size: 1.2rem;
  color: #5a6c7d;
  margin-bottom: 2.5rem;
  line-height: 1.8;
}

.ai-process {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.ai-step {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: white;
  padding: 1rem;
  border-radius: 15px;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
  transition: transform 0.3s ease;
}

.ai-step:hover {
  transform: translateX(5px);
}

.ai-step-icon-container {
  flex-shrink: 0;
}

.ai-step-text h5 {
  font-size: 1.3rem;
  color: #2c3e50;
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.ai-step-text p {
  color: #5a6c7d;
  line-height: 1.6;
}

.ai-image img {
  width: 100%;
  border-radius: 15px;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
}

/* Breathing Science */
.science-explanation {
  max-width: 1000px;
  margin: 0 auto;
}

.explanation-card {
  background: white;
  padding: 3rem;
  border-radius: 20px;
  text-align: center;
  margin-bottom: 2rem;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
}

.explanation-question {
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}

.explanation-icon-container {
  display: flex;
  align-items: center;
  justify-content: center;
}

/* explanation-icon 样式已在上方统一定义 */

.explanation-card h4 {
  font-size: 1.8rem;
  color: #2c3e50;
  font-weight: 600;
}

.answer-highlight {
  background: linear-gradient(135deg, #4caf50, #45a049);
  color: white;
  padding: 1rem 2rem;
  border-radius: 50px;
  display: inline-block;
}

.answer {
  font-size: 1.3rem;
  font-weight: 600;
}

.breathing-process h4 {
  font-size: 2rem;
  color: #2c3e50;
  text-align: center;
  margin-bottom: 1rem;
  font-weight: 600;
}

.process-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 2rem;
}

.flow-step {
  background: white;
  padding: 2rem;
  border-radius: 15px;
  text-align: center;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
  flex: 1 1 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  min-height: 260px;
  box-sizing: border-box;
}

.flow-icon-container {
  margin: 0 auto 1rem;
}

.flow-step h5 {
  font-size: 1.3rem;
  color: #2c3e50;
  margin-bottom: 0.8rem;
  font-weight: 600;
}

.flow-step p {
  color: #5a6c7d;
  line-height: 1.6;
  font-size: 0.95rem;
}

.flow-arrow {
  font-size: 2rem;
  color: #667eea;
  font-weight: bold;
}

.key-insights {
  display: flex;
  gap: 2rem;
}

.insight-card {
  background: white;
  padding: 1.2rem 1rem;
  border-radius: 15px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
  border-left: 4px solid #667eea;
  transition: transform 0.3s ease;
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.3rem;
}

.insight-card-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.insight-icon-container {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.insight-card i {
  color: #667eea;
  font-size: 2rem;
}

.insight-card h5 {
  font-size: 1.3rem;
  color: #2c3e50;
  font-weight: 600;
}

.insight-card p {
  color: #5a6c7d;
  line-height: 1.8;
}

/* 响应式设计 */

/* 优化过渡效果 */
.header {
  transition: transform 0.3s ease;
}

/* 大型平板设备 (1024px 及以下) */
@media (max-width: 1024px) {
  .container {
    padding: 0 15px;
  }

  .hero-text h1 {
    font-size: 3rem;
  }

  .section-header h3 {
    font-size: 2.2rem;
  }

  .features-grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
  }
}

/* 平板设备 (768px 及以下) */
@media (max-width: 768px) {
  .header {
    padding: 0.8rem 0;
  }

  .header .container {
    flex-direction: column;
    gap: 1rem;
  }

  .nav-tabs {
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.3rem;
  }

  .tab-btn {
    padding: 0.6rem 1.2rem;
    font-size: 0.9rem;
  }

  /* Hero Section */
  .hero-section {
    padding: 3rem 0;
    min-height: 50vh;
  }

  .hero-content {
    flex-direction: column;
    gap: 2rem;
    text-align: center;
  }
  
  .hero-text {
    min-width: auto;
    max-width: none;
  }
  
  .hero-image {
    min-width: auto;
    max-width: 400px;
  }

  .hero-text h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
  }

  .hero-text h2 {
    font-size: 1.4rem;
  }

  .hero-features {
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
  }

  .feature-item {
    font-size: 0.9rem;
  }

  /* Sections */
  .product-details {
    padding: 3rem 0;
  }

  /* 使用说明页面专用优化 - 更紧凑的布局 */
  .usage-hero,
  .biofeedback-section,
  .system-working,
  .ai-prediction,
  .breathing-science {
    padding: 2rem 0;
  }

  .section-header {
    margin-bottom: 2.5rem;
  }

  /* 使用说明页面section header优化 */
  .usage-hero .section-header,
  .biofeedback-section .section-header,
  .system-working .section-header,
  .ai-prediction .section-header,
  .breathing-science .section-header {
    margin-bottom: 1.5rem;
  }

  .section-header h3 {
    font-size: 2rem;
  }

  .section-header p {
    font-size: 1rem;
  }

  /* Grids */
  .features-grid {
    gap: 1.5rem;
    margin-bottom: 3rem;
  }

  .showcase-content {
    gap: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
  }

  .testimonial-grid {
    gap: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
  }

  /* Footer */
  .footer-content {
    gap: 2rem;
    text-align: center;
  }

  /* Cards */
  .feature-card {
    padding: 2rem;
  }

  .product-showcase {
    padding: 2rem;
    margin-bottom: 3rem;
  }

  .testimonial-card {
    padding: 1.5rem;
  }

  /* Usage page styles */
  .usage-intro h1 {
    font-size: 2rem;
  }

  .usage-intro h2 {
    font-size: 1.2rem;
  }

  .working-process {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
  }

  .feature-showcase {
    padding: 1rem;
    gap: 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
  }

  .ai-content {
    gap: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
  }

  .ai-process {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }

  .ai-text h4 {
    font-size: 2rem;
    text-align: center;
  }

  .process-flow {
    flex-wrap: wrap;
    gap: 0.8rem;
  }

  .flow-arrow {
    display: none;
  }

  .key-insights {
    flex-direction: column;
    gap: 1rem;
  }

  .explanation-card {
    padding: 2rem;
  }

  .process-step {
    padding: 2rem;
  }

  .breathing-process h4 {
    font-size: 1.8rem;
  }

  .explanation-card h4 {
    font-size: 1.6rem;
  }

  .step-icon-container,
  .feature-icon-container,
  .flow-icon-container,
  .ai-step-icon-container,
  .explanation-icon-container,
  .highlight-icon-container,
  .patent-icon-container,
  .highlight-box-icon-container,
  .insight-icon-container {
    width: 35px;
    height: 35px;
    min-width: 35px;
    min-height: 35px;
  }

  .step-icon,
  .feature-icon,
  .flow-icon,
  .ai-step-icon,
  .explanation-icon,
  .highlight-icon,
  .patent-icon,
  .highlight-box-icon,
  .insight-icon {
    font-size: 1.1rem;
  }
}

/* 大型手机设备 (480px 及以下) */
@media (max-width: 480px) {
  .container {
    padding: 0 10px;
  }

  /* Header */
  .header {
    padding: 0.5rem 0;
  }

  .logo {
    font-size: 1.3rem;
  }

  .logo i {
    font-size: 1.5rem;
  }

  .nav-tabs {
    width: 100%;
  }

  .tab-btn {
    flex: 1;
    padding: 0.5rem 0.8rem;
    font-size: 0.85rem;
    min-width: auto;
  }

  /* Hero */
  .hero-section {
    padding: 2rem 0;
  }
  
  .hero-content {
    gap: 1.5rem;
  }
  
  .hero-image {
    max-width: 300px;
  }

  .hero-text h1 {
    font-size: 2rem;
    line-height: 1.2;
  }

  .hero-text h2 {
    font-size: 1.2rem;
  }

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

  .hero-features {
    flex-direction: column;
    align-items: center;
    gap: 0.8rem;
  }

  /* Sections */
  .product-details {
    padding: 2rem 0;
  }

  /* 使用说明页面移动端超紧凑布局 */
  .usage-hero,
  .biofeedback-section,
  .system-working,
  .ai-prediction,
  .breathing-science {
    padding: 1.2rem 0;
  }

  /* 使用说明页面section header移动端优化 */
  .usage-hero .section-header,
  .biofeedback-section .section-header,
  .system-working .section-header,
  .ai-prediction .section-header,
  .breathing-science .section-header {
    margin-bottom: 1rem;
  }

  .section-header h3 {
    font-size: 1.8rem;
    line-height: 1.3;
  }

  .section-header p {
    font-size: 0.95rem;
  }

  /* Cards and components */
  .feature-card {
    padding: 1.5rem;
  }

  .explanation-card,
  .process-step {
    padding: 1rem;
  }

  .feature-card h4,
  .patent-card h4 {
    font-size: 1.3rem;
  }

  .feature-card p,
  .patent-card p {
    font-size: 0.9rem;
  }

  /* Stats */
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }

  .stat-number {
    font-size: 2.5rem;
  }

  .stat-label {
    font-size: 1rem;
  }

  /* Endorsements and Partners */
  .endorsements-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

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

  .partner-logo {
    padding: 1rem;
  }

  /* Usage page */
  .working-process {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .usage-intro h1 {
    font-size: 1.8rem;
    line-height: 1.3;
  }

  .usage-intro h2 {
    font-size: 1.1rem;
  }

  .usage-intro p {
    font-size: 0.95rem;
  }

  .ai-text h4 {
    font-size: 1.8rem;
    text-align: center;
  }

  .ai-text > p {
    font-size: 1rem;
  }

  .ai-step {
    flex-direction: column;
    text-align: center;
    gap: 0.8rem;
    padding: 1rem;
  }

  .ai-step-text h5 {
    font-size: 1rem;
    margin-bottom: 0.4rem;
  }

  .ai-step-text p {
    font-size: 0.85rem;
    line-height: 1.3;
  }

  .feature-text h4 {
    font-size: 1.6rem;
    text-align: center;
  }

  .showcase-text h4 {
    font-size: 1.6rem;
  }

  .breathing-process h4 {
    font-size: 1.4rem;
  }

  .explanation-card h4 {
    font-size: 1.2rem;
  }

  .explanation-card p {
    font-size: 0.85rem;
    line-height: 1.4;
    margin-bottom: 0.8rem;
  }

  .process-step h4 {
    font-size: 1.1rem;
  }

  .process-step p {
    line-height: 1.4;
  }

  .flow-step {
    padding: 1rem;
    min-width: auto;
  }

  .flow-step h5 {
    font-size: 1rem;
    margin-bottom: 0.4rem;
  }

  .flow-step p {
    font-size: 0.85rem;
    line-height: 1.3;
  }

  /* Product showcase */
  .product-showcase {
    padding: 1.5rem;
  }

  .showcase-text h4 {
    font-size: 1.5rem;
  }

  .showcase-text p {
    font-size: 0.95rem;
  }

  .benefits-list li {
    font-size: 0.9rem;
  }

  /* Testimonials */
  .testimonials h4 {
    font-size: 1.6rem;
  }

  .testimonial-card {
    padding: 1.2rem;
  }

  .testimonial-content p {
    font-size: 0.9rem;
  }

  /* Footer */
  .footer {
    padding: 2rem 0 1rem;
  }

  .footer-contact h4 {
    font-size: 1.1rem;
  }

  .footer-contact p {
    font-size: 0.9rem;
  }

  /* Highlight boxes */
  .highlight-box {
    padding: 0.8rem;
    flex-direction: column;
    text-align: center;
    gap: 0.6rem;
    display: flex;
    flex-direction: row;
  }

  .highlight-box span {
    font-size: 0.9rem;
  }

  .feature-highlight {
    gap: 0.8rem;
  }

  .highlight-item {
    padding: 0.8rem 1rem;
    flex-direction: column;
    text-align: center;
    gap: 0.5rem;
  }

  .highlight-item span {
    font-size: 0.9rem;
  }

  .feature-image img {
    width: 100%;
    border-radius: 15px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
    padding: 0;
  }

  /* Answer highlight */
  .answer-highlight {
    padding: 0.8rem 1.5rem;
  }

  .answer {
    font-size: 1.1rem;
  }

  /* Step numbers */
  .step-number {
    width: 30px;
    height: 30px;
    font-size: 1rem;
    top: -12px;
  }

  .step-content h4 {
    font-size: 1.2rem;
  }

  .step-icon {
    width: 30px;
    height: 30px;
    font-size: 1.2rem;
  }

  /* 滚动到顶部按钮移动端优化 */
  .scroll-to-top {
    bottom: 20px;
    right: 20px;
    width: 45px;
    height: 45px;
    font-size: 1.1rem;
  }

  .step-icon-container,
  .feature-icon-container,
  .flow-icon-container,
  .ai-step-icon-container,
  .explanation-icon-container,
  .highlight-icon-container,
  .patent-icon-container,
  .highlight-box-icon-container,
  .insight-icon-container {
    width: 25px;
    height: 25px;
    min-width: 25px;
    min-height: 25px;
  }

  .step-icon,
  .feature-icon,
  .flow-icon,
  .ai-step-icon,
  .explanation-icon,
  .highlight-icon,
  .patent-icon,
  .highlight-box-icon,
  .insight-icon {
    font-size: 1rem;
  }
}

/* 小型手机设备 (360px 及以下) */
@media (max-width: 360px) {
  .container {
    padding: 0 8px;
  }

  .hero-text h1 {
    font-size: 1.8rem;
  }
  
  .hero-content {
    gap: 1rem;
  }
  
  .hero-image {
    max-width: 250px;
  }

  .section-header h3 {
    font-size: 1.6rem;
  }

  .usage-intro h1 {
    font-size: 1.6rem;
  }

  .ai-text h4 {
    font-size: 1.6rem;
    text-align: center;
  }

  .ai-process {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.8rem;
  }

  .working-process {
    grid-template-columns: 1fr;
    gap: 0.8rem;
  }

  .feature-card,
  .patent-card,
  .endorsement-card,
  .team-member {
    padding: 1.2rem;
  }

  .explanation-card,
  .process-step {
    padding: 0.8rem;
  }

  .explanation-card h4 {
    font-size: 1.1rem;
  }

  .explanation-card p {
    font-size: 0.8rem;
    line-height: 1.3;
    margin-bottom: 0.6rem;
  }

  .tab-btn {
    padding: 0.4rem 0.6rem;
    font-size: 0.8rem;
  }

  .feature-icon,
  .patent-icon,
  .concept-icon,
  .explanation-icon,
  .ai-step-icon {
    font-size: 1rem;
  }

  .flow-step h5 {
    font-size: 0.9rem;
  }

  .flow-step p {
    font-size: 0.8rem;
    line-height: 1.2;
  }

  .step-icon {
    width: 35px;
    height: 35px;
    font-size: 1rem;
  }

  /* 滚动到顶部按钮超小屏优化 */
  .scroll-to-top {
    bottom: 15px;
    right: 15px;
    width: 40px;
    height: 40px;
    font-size: 1rem;
  }
}

/* 触摸设备优化 */
@media (hover: none) and (pointer: coarse) {
  .tab-btn,
  .feature-card,
  .patent-card,
  .endorsement-card,
  .team-member,
  .process-step,
  .ai-step,
  .insight-card,
  .explanation-card,
  .flow-step,
  .scroll-to-top {
    transform: none !important;
  }

  .tab-btn:hover,
  .feature-card:hover,
  .patent-card:hover,
  .endorsement-card:hover,
  .team-member:hover,
  .process-step:hover,
  .ai-step:hover,
  .insight-card:hover,
  .explanation-card:hover,
  .flow-step:hover,
  .scroll-to-top:hover {
    transform: none !important;
  }

  /* 增加触摸友好的最小尺寸 */
  .tab-btn {
    min-height: 44px;
    min-width: 44px;
  }

  button,
  .btn {
    min-height: 44px;
    min-width: 44px;
  }

  .scroll-to-top {
    min-height: 44px;
    min-width: 44px;
  }
}

/* 减少动画以提高性能 */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* 超大屏幕优化 (1440px 及以上) */
@media (min-width: 1440px) {
  .container {
    max-width: 1400px;
    padding: 0 40px;
  }

  .hero-text h1 {
    font-size: 4rem;
  }
  
  .hero-content {
    gap: 4rem;
  }
  
  .hero-text {
    max-width: 700px;
  }
  
  .hero-image {
    max-width: 600px;
  }

  .section-header h3 {
    font-size: 3rem;
  }

  .features-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 3rem;
  }
}

/* 横屏小屏设备优化 */
@media (max-height: 500px) and (orientation: landscape) {
  .hero-section {
    padding: 2rem 0;
    min-height: auto;
  }

  .usage-hero {
    padding: 3rem 0;
  }

  .product-details,
  .biofeedback-section,
  .system-working,
  .ai-prediction,
  .breathing-science {
    padding: 2rem 0;
  }

  .section-header {
    margin-bottom: 2rem;
  }
}

/* 打印样式优化 */
@media print {
  .header,
  .footer,
  .nav-tabs {
    display: none !important;
  }

  .tab-content {
    display: block !important;
  }

  * {
    background: white !important;
    color: black !important;
    box-shadow: none !important;
  }

  .container {
    max-width: none;
    padding: 0;
  }

  .hero-section,
  .usage-hero {
    background: white !important;
    color: black !important;
  }
}

/* 高分辨率屏幕优化 */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .feature-icon,
  .concept-icon,
  .explanation-icon {
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
  }
}

/* 暗色模式支持 */
@media (prefers-color-scheme: dark) {
  /* 这里可以添加暗色模式样式，目前保持原样 */
  /* 可以根据需要后续添加 */
}

/* 各个图标的特定背景色 */
.feature-icon {
  background: linear-gradient(135deg, #667eea, #764ba2);
}

.step-icon {
  background: linear-gradient(135deg, #4caf50, #45a049);
}

.flow-icon {
  background: linear-gradient(135deg, #2196f3, #1976d2);
}

.ai-step-icon {
  background: linear-gradient(135deg, #9c27b0, #8e24aa);
}

.explanation-icon {
  background: linear-gradient(135deg, #ff5722, #e64a19);
}

/* 新增图标样式 */
.highlight-icon,
.highlight-box-icon {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

/* 各个图标的特定背景色 */
.highlight-icon {
  background: linear-gradient(135deg, #3498db, #2980b9);
}