/* ==========================================================================
   顶部导航 + 底部 Footer
   ========================================================================== */

/* 顶部条（电话/邮箱） */
.topbar {
  background: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.85);
  font-size: 12px;
  line-height: 36px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

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

.topbar-left span {
  margin-right: 20px;
}

.topbar-right a {
  margin-left: 18px;
  transition: color var(--transition);
}

.topbar-right a:hover {
  color: #fff;
}

/* 头部主导航 */
.header {
  background: #fff;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: all var(--transition);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 84px;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-img {
  display: block;
  height: 60px;
  width: auto;
  max-width: 100%;
  object-fit: contain;
}

.logo-mark {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 22px;
  letter-spacing: -1px;
  box-shadow: 0 2px 8px rgba(0, 86, 174, 0.25);
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.logo-text-cn {
  font-size: 19px;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: 1px;
}

.logo-text-en {
  font-size: 11px;
  color: var(--color-text-mute);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-top: 2px;
}

/* 主导航 */
.nav-main {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-main > li {
  position: relative;
}

.nav-main > li > a {
  display: block;
  padding: 28px 22px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  position: relative;
  transition: color var(--transition);
}

.nav-main > li > a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 3px;
  background: var(--color-primary);
  transition: width var(--transition);
}

.nav-main > li > a:hover,
.nav-main > li.active > a {
  color: var(--color-primary);
}

.nav-main > li > a:hover::after,
.nav-main > li.active > a::after {
  width: 60%;
}

/* 二级菜单 */
.nav-sub {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 180px;
  background: #fff;
  box-shadow: var(--shadow-md);
  border-top: 3px solid var(--color-primary);
  padding: 8px 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all var(--transition);
  z-index: 99;
}

.nav-main > li:hover .nav-sub {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-sub li a {
  display: block;
  padding: 10px 24px;
  font-size: 14px;
  color: var(--color-text-soft);
  transition: all var(--transition);
}

.nav-sub li a:hover {
  background: var(--color-bg-soft);
  color: var(--color-primary);
  padding-left: 28px;
}

/* 移动端菜单按钮 */
.menu-toggle {
  display: none;
  width: 32px;
  height: 32px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 4px;
  font-size: 18px;
}

/* ==========================================================================
   底部 Footer
   ========================================================================== */
.footer {
  background: #1a2b3c;
  color: rgba(255, 255, 255, 0.7);
  padding: 56px 0 0;
}

.footer-main {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 48px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-col h4 {
  color: #fff;
  font-size: 16px;
  font-weight: 500;
  margin-bottom: 22px;
  position: relative;
  padding-bottom: 12px;
}

.footer-col h4::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 24px;
  height: 2px;
  background: var(--color-primary-light);
}

.footer-col p,
.footer-col li {
  font-size: 13px;
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.6);
}

.footer-col li {
  margin-bottom: 6px;
}

.footer-col li a {
  color: rgba(255, 255, 255, 0.6);
  transition: color var(--transition);
}

.footer-col li a:hover {
  color: #fff;
}

.footer-contact .item {
  display: flex;
  gap: 10px;
  margin-bottom: 14px;
  align-items: flex-start;
}

.footer-contact .icon {
  width: 22px;
  flex-shrink: 0;
  color: var(--color-primary-light);
  margin-top: 3px;
}

.footer-bottom {
  padding: 22px 0;
  text-align: center;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

.footer-logo {
  height: 42px;
  width: auto;
  display: block;
  opacity: 0.92;
}

.footer-copy {
  line-height: 1.6;
}

.footer-bottom a {
  color: rgba(255, 255, 255, 0.5);
  margin: 0 8px;
}

.footer-bottom a:hover {
  color: #fff;
}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 992px) {
  .footer-main {
    grid-template-columns: 1fr 1fr;
  }
  .nav-main > li > a {
    padding: 28px 14px;
    font-size: 14px;
  }
}

@media (max-width: 768px) {
  .topbar {
    display: none;
  }
  .header .container {
    height: 64px;
  }
  .logo-img {
    height: 44px;
  }
  .nav-main {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    padding: 12px 0;
    box-shadow: var(--shadow-md);
    gap: 0;
  }
  .nav-main.show {
    display: flex;
  }
  .nav-main > li > a {
    padding: 14px 24px;
  }
  .nav-sub {
    position: static;
    box-shadow: none;
    border-top: none;
    background: var(--color-bg-soft);
    opacity: 1;
    visibility: visible;
    transform: none;
  }
  .menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .footer-main {
    grid-template-columns: 1fr;
    gap: 36px;
  }
}