:root {
  /* 首页同款蓝色系变量 */
  --brand-blue: #2563EB;
  --brand-blue-hover: #1D4ED8;
  --brand-blue-light: #EFF6FF;
  --blue-hw-gradient: linear-gradient(165deg, #1D4ED8 0%, #2563EB 60%, #0F2859 100%);
}
.site-header {
  width: 100%;
  background: #ffffff; 
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
  position: sticky;
  top: 0;
  z-index: 9999;
}
.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 75px;
  width: 1200px;
  max-width: 100%;
  margin: 0 auto;
  padding: 0 16px;
  box-sizing: border-box;
}
.logo-box {
  display: flex;
  align-items: center;
  text-decoration: none;
}
.site-logo {
  width: auto;
  height: 48px;
  max-width: 100%;
  object-fit: contain;
}
/* PC 端导航 */
.pc-nav {
  display: flex;
  gap: 32px;
  align-items: center;
  height: 100%;
}
.nav-item {
  font-size: 16px;
  font-weight: 500;
  color: #1f2937;
  text-decoration: none;
  height: 75px;
  line-height: 75px;
  display: inline-block;
  position: relative;
  transition: color 0.25s ease;
}
.nav-item:hover, .nav-item.active {
  color: var(--brand-blue);
}
.nav-item.active::after, .nav-item:hover::after {
  content: "";
  width: 100%;
  height: 3px;
  background: var(--brand-blue);
  position: absolute;
  bottom: 0;
  left: 0;
  border-radius: 3px 3px 0 0;
}
/* 按钮样式 */
.download-btn {
  padding: 11px 24px;
  background: var(--blue-hw-gradient);
  color: #ffffff !important;
  border-radius: 24px; 
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
  line-height: 1;
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}
.download-btn:hover {
  background: var(--brand-blue-hover);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
  transform: translateY(-1px);
}
/* 移动端汉堡按钮 */
.mobile-menu-btn {
  display: none;
  width: 30px;
  height: 24px;
  flex-direction: column;
  justify-content: space-between;
  cursor: pointer;
  padding: 2px;
  box-sizing: border-box;
  z-index: 10001;
}
.mobile-menu-btn .icon-bar {
  display: block;
  width: 100%;
  height: 3px;
  background-color: #1f2937;
  border-radius: 2px;
  transition: all 0.3s ease;
}
.mobile-menu-btn.active .icon-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
  background-color: var(--brand-blue);
}
.mobile-menu-btn.active .icon-bar:nth-child(2) {
  opacity: 0;
}
.mobile-menu-btn.active .icon-bar:nth-child(3) {
  transform: translateY(-9px) rotate(-45deg);
  background-color: var(--brand-blue);
}
/* 移动端导航菜单 */
.mobile-nav {
  display: none;
  width: 100%;
  background: #ffffff;
  border-top: 1px solid #f3f4f6;
  flex-direction: column;
  padding: 10px 20px 20px 20px;
  box-shadow: 0 8px 20px rgba(0,0,0,0.08);
  box-sizing: border-box;
  position: absolute;
  top: 100%;
  left: 0;
  z-index: 9998;
}
.m-nav-item {
  border-bottom: 1px dashed #f3f4f6;
}
.m-nav-link {
  font-size: 15px;
  font-weight: 500;
  color: #374151;
  padding: 12px 0;
  text-decoration: none;
  display: block;
}
.m-nav-link.m-nav-active {
  color: var(--brand-blue);
  font-weight: bold;
}
.mobile-dl {
  text-align: center !important;
  margin-top: 15px;
  border-bottom: none !important;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}
/* 响应式 */
@media (max-width: 1120px) {
  .nav-wrap {
    width: 100% !important;
    max-width: 100% !important;
    min-width: 100% !important;
    padding-left: 16px !important;
    padding-right: 16px !important;
    box-sizing: border-box !important;
    height: 60px !important;
  }
  .site-logo {
    height: 34px !important; 
    max-width: 180px !important;
  }
  .mobile-menu-btn { 
    display: flex !important; 
  }
  .pc-nav, .download-btn:not(.mobile-dl) { 
    display: none !important; 
  }
}
.clean-footer {
    background: #111827;
    color: #b0b4bc;
    padding: 35px 0 0 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    display: block;
    clear: both;
    position: relative;
    z-index: 10;
}
.clean-foot-wrap {
    background: #111827;
    padding: 0 20px;
}
/* 布局网格系统 */
.m-flex-box {
    display: flex;
    flex-wrap: wrap;
    margin: 0 -15px;
}
.m-flex-left {
    width: 33.333%;
    padding: 0 15px;
    box-sizing: border-box;
}
.m-flex-right {
    width: 66.666%;
    padding: 0 15px;
    box-sizing: border-box;
}
/* 左侧内容样式 */
.m-site-desc {
    margin: 0;
    padding: 0;
    color: #b0b4bc;
    font-size: 13px;
    line-height: 1.8;
    text-align: justify;
}
.m-site-title {
    color: #ffffff;
    font-size: 15px;
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
}
/* 右侧标题及链接网格，左侧竖线改为品牌蓝 */
.m-section-title {
    color: #ffffff;
    font-weight: 600;
    font-size: 14px;
    margin: 0 0 15px 0;
    padding-left: 8px;
    border-left: 3px solid #1D4ED8;
    line-height: 1;
    box-sizing: border-box;
}
.m-link-grid {
    display: flex;
    flex-wrap: wrap;
    margin: 0;
    padding: 0;
}
/* 网格响应式：移动端2列，PC端4列 */
.m-grid-item {
    width: 50%;
    margin-bottom: 12px;
    box-sizing: border-box;
}
@media screen and (min-width: 768px) {
    .m-grid-item {
        width: 25%; /* PC端平铺 4 列 */
    }
}
.m-pure-link {
    color: #ffffff;
    font-size: 13px;
    text-decoration: none;
    display: inline-block;
    line-height: 1.5;
    transition: color 0.2s ease;
}
.m-pure-link:hover, 
.m-pure-link:active {
    color: #1D4ED8;
    text-decoration: none;
}
/* 风险提示 */
.m-risk-notice {
    font-size: 11px;
    color: #727a90;
    line-height: 1.6;
    text-align: justify;
    letter-spacing: 0.2px;
    margin-top: 25px;
    border-top: 1px solid #2e354f;
    padding-top: 15px;
}
/* 底部版权栏 */
.clean-foot-cop {
    border-top: 1px solid #1f2937;
    padding: 20px;
    background: #0F172A;
    font-size: 12px;
    color: #8d94a6;
    margin-top: 25px;
}
.m-cop-flex {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}
.m-legal-link {
    color: #b0b4bc;
    text-decoration: none;
    font-size: 12px;
    display: inline-block;
}
.m-legal-link:hover, 
.m-legal-link:active {
    color: #1D4ED8;
}
/* 移动端适配 */
@media screen and (max-width: 767px) {
    .m-flex-left, 
    .m-flex-right {
        width: 100%;
    }
    
    .m-flex-left {
        margin-bottom: 25px;
    }
    
    .m-cop-flex {
        justify-content: center;
    }
    
    .m-cop-text, 
    .m-cop-links {
        width: 100%;
        text-align: center;
    }
    
    .m-cop-text {
        margin-bottom: 8px;
    }
}