/* ODI境外投资备案专用样式 */
.odi-investment {
  padding-top: 70px;
}

/* 导航栏样式 */
.nav-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  padding: 15px 0;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

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

.logo-link {
  font-size: 1.8rem;
  font-weight: 700;
  color: white;
  text-decoration: none;
  transition: all 0.3s ease;
}

.logo-link:hover {
  color: #667eea;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  cursor: pointer;
  gap: 4px;
}

.nav-toggle span {
  width: 25px;
  height: 3px;
  background: white;
  transition: all 0.3s ease;
}

.hero-section {
  padding: 110px 0 30px !important;
}

.primary-cta-button {
  background: white;
  color: #ea580c;
  padding: 18px 40px;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 600;
  font-size: 1.1rem;
  transition: all 0.3s ease;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

.primary-cta-button:hover {
  transform: translateY(-3px);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
}

.secondary-cta-button {
  background: transparent;
  color: white;
  padding: 18px 40px;
  border: 2px solid white;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 600;
  font-size: 1.1rem;
  transition: all 0.3s ease;
}

.secondary-cta-button:hover {
  background: white;
  color: #ea580c;
  transform: translateY(-3px);
}

/* 全宽模块样式 */
.content-section {
  width: 100%;
  padding: 100px 0;
}

.content-section:nth-child(odd) {
  background: #f8f9fa;
}

.content-section:nth-child(even) {
  background: white;
}

.section-title {
  color: #2c3e50;
  font-size: 2.8rem;
  margin-bottom: 20px;
  text-align: center;
  font-weight: 700;
}

.section-subtitle {
  text-align: center;
  color: #666;
  font-size: 1.2rem;
  margin-bottom: 60px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* 特点模块 */
.features-section {
  background: white;
  padding: 100px 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  margin-top: 60px;
}

.feature-card {
  background: white;
  padding: 40px 30px;
  border-radius: 20px;
  text-align: center;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  border: 2px solid transparent;
  transition: all 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
  border-color: #ea580c;
}

.feature-icon {
  font-size: 3.5rem;
  margin-bottom: 25px;
  display: block;
}

.feature-card h3 {
  color: #2c3e50;
  font-size: 1.4rem;
  margin-bottom: 20px;
  font-weight: 600;
}

.feature-card p {
  color: #666;
  line-height: 1.6;
  margin-bottom: 20px;
}


/* 流程步骤样式 */
.process-steps {
  margin-top: 60px;
}

.steps-container {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 30px;
  position: relative;
}

.step-item {
  flex: 1;
  text-align: center;
  position: relative;
}

.step-header {
  background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
  color: white;
  padding: 20px;
  border-radius: 15px;
  margin-bottom: 20px;
  box-shadow: 0 8px 25px rgba(59, 130, 246, 0.3);
  transition: all 0.3s ease;
  position: relative;
}

.step-header:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 35px rgba(59, 130, 246, 0.4);
}

.step-icon {
  font-size: 2.5rem;
  margin-bottom: 15px;
  display: block;
}

.step-title {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 0;
}

.step-description {
  background: #f8f9fa;
  padding: 25px 20px;
  border-radius: 10px;
  border: 1px solid #e9ecef;
  text-align: left;
}

.step-description p {
  color: #666;
  line-height: 1.6;
  margin-bottom: 10px;
  font-size: 0.95rem;
}

.step-description p:last-child {
  margin-bottom: 0;
}

/* 箭头连接器 */
.step-item:not(:last-child)::after {
  content: '→';
  position: absolute;
  right: -25px;
  top: 50px;
  font-size: 2rem;
  color: #3b82f6;
  font-weight: bold;
  z-index: 1;
}

/* 材料清单样式 */
.materials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 30px;
  margin-top: 60px;
}

.material-item {
  background: white;
  border-left: 5px solid #ea580c;
  padding: 25px;
  border-radius: 10px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
  transition: all 0.3s ease;
}

.material-item:hover {
  transform: translateX(10px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.material-item h4 {
  color: #2c3e50;
  font-size: 1.2rem;
  margin-bottom: 15px;
  font-weight: 600;
}

.material-item ul {
  list-style: none;
  padding: 0;
}

.material-item li {
  color: #666;
  padding: 5px 0;
  padding-left: 20px;
  position: relative;
}

.material-item li::before {
  content: '•';
  color: #ea580c;
  position: absolute;
  left: 0;
  font-weight: bold;
}

/* FAQ样式 */
.faq-container {
  margin-top: 60px;
}

.faq-item {
  background: white;
  border-radius: 10px;
  margin-bottom: 20px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
  overflow: hidden;
}

.faq-question {
  background: #f8f9fa;
  padding: 25px;
  cursor: pointer;
  font-weight: 600;
  color: #2c3e50;
  font-size: 1.1rem;
  transition: all 0.3s ease;
  border: none;
  width: 100%;
  text-align: left;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-question:hover {
  background: #ea580c;
  color: white;
}

.faq-question::after {
  content: '+';
  font-size: 1.5rem;
  transition: transform 0.3s ease;
}

.faq-question.active::after {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 25px;
  max-height: 0;
  overflow: hidden;
  transition: all 0.3s ease;
}

.faq-answer.active {
  padding: 25px;
  max-height: 500px;
}

.faq-answer p {
  color: #666;
  line-height: 1.6;
  margin-bottom: 15px;
}


/* 风险提示样式 */
.risk-warning {
  background: linear-gradient(135deg, #dc2626 0%, #ef4444 100%);
  color: white;
  padding: 40px;
  border-radius: 15px;
  margin-top: 60px;
  text-align: center;
}

.risk-warning h3 {
  font-size: 1.5rem;
  margin-bottom: 20px;
  font-weight: 600;
}

.risk-warning p {
  font-size: 1.1rem;
  line-height: 1.6;
  opacity: 0.9;
}

/* 联系CTA样式 */
.contact-cta {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 60px 0;
  text-align: center;
}

.contact-cta h2 {
  font-size: 2.5rem;
  margin-bottom: 20px;
  font-weight: 700;
}

.contact-cta p {
  font-size: 1.2rem;
  margin-bottom: 40px;
  opacity: 0.9;
}

/* 中等屏幕设备响应式 */
@media (max-width: 1200px) and (min-width: 1025px) {
  .features-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
  }
}

/* 平板设备响应式 */
@media (max-width: 1024px) and (min-width: 769px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 25px;
  }

  .steps-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }

  .step-item::after {
    display: none;
  }

  .step-item:nth-child(2)::after {
    content: '↓';
    position: absolute;
    bottom: -30px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 2rem;
    color: #3b82f6;
    font-weight: bold;
  }
}

/* 手机设备响应式 */
@media (max-width: 768px) {
  .odi-hero h1 {
    font-size: 2.5rem;
  }

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

  .nav-menu {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .steps-container {
    flex-direction: column;
    gap: 40px;
  }

  .step-item::after {
    display: none;
  }

  .step-item {
    position: relative;
  }

  .step-item:not(:last-child)::after {
    content: '↓';
    position: absolute;
    bottom: -30px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 2rem;
    color: #3b82f6;
    font-weight: bold;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

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

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