/* nav.css — 导航+面包屑+分页（全局加载） */

/* === Header === */
.header {
  background: #f2f2f2;
  border-bottom: 1px solid #d1d1d1;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: 64px;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
  -webkit-align-items: center;
  -ms-flex-align: center;
  align-items: center;
  -webkit-box-pack: justify;
  -webkit-justify-content: space-between;
  -ms-flex-pack: justify;
  justify-content: space-between;
  height: 100%;
}

.logo {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 500;
  color: var(--color-text);
  letter-spacing: 0.02em;
}

.logo a {
  color: var(--color-text);
}

.logo a:hover {
  color: var(--color-primary);
}

/* === Main Nav === */
.main-nav {
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
  -webkit-align-items: center;
  -ms-flex-align: center;
  align-items: center;
  gap: 32px;
}

.main-nav a {
  font-family: var(--font-display);
  font-size: 14px;
  color: var(--color-text);
  -webkit-transition: color 0.1s;
  transition: color 0.1s;
  position: relative;
}

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

.main-nav a.active::after {
  content: '';
  position: absolute;
  bottom: -22px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-primary);
}

/* === Mobile Menu Toggle === */
.menu-toggle {
  display: none;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.menu-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  margin: 5px auto;
  -webkit-transition: all 0.3s;
  transition: all 0.3s;
}

/* === Breadcrumb === */
.breadcrumb {
  padding: 16px 0;
  font-size: 13px;
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 32px;
}

.breadcrumb a {
  color: var(--color-text-secondary);
}

.breadcrumb a:hover {
  color: var(--color-primary);
}

.breadcrumb-sep {
  margin: 0 8px;
  color: var(--color-border);
}

/* === Back to Top === */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  background: var(--color-primary);
  color: var(--color-white);
  border: none;
  cursor: pointer;
  display: none;
  z-index: 999;
  -webkit-box-align: center;
  -webkit-align-items: center;
  -ms-flex-align: center;
  align-items: center;
  -webkit-box-pack: center;
  -webkit-justify-content: center;
  -ms-flex-pack: center;
  justify-content: center;
  font-size: 18px;
}

.back-to-top.show {
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
}

/* === Responsive Nav === */
@media (max-width: 1023px) {
  .main-nav {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    bottom: 0;
    background: #f2f2f2;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
    padding: 32px 20px;
    gap: 0;
    -webkit-transform: translateX(100%);
    -ms-transform: translateX(100%);
    transform: translateX(100%);
    -webkit-transition: -webkit-transform 0.3s;
    transition: transform 0.3s;
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    z-index: 999;
  }

  .main-nav.open {
    -webkit-transform: translateX(0);
    -ms-transform: translateX(0);
    transform: translateX(0);
  }

  .main-nav a {
    padding: 16px 0;
    font-size: 18px;
    border-bottom: 1px solid var(--color-border);
    width: 100%;
  }

  .main-nav a.active::after {
    display: none;
  }

  .menu-toggle {
    display: block;
  }
}