/*
 * Jiedu Header CSS
 * 站点顶部、品牌、导航和手机菜单。
 */
.jiedu-topbar {
  display: none;
}

.jiedu-site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(26, 61, 92, 0.1);
  background: rgba(250, 250, 248, 0.98);
  box-shadow: 0 1px 0 rgba(15, 36, 55, 0.03);
  backdrop-filter: blur(14px);
}

.jiedu-header-main {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 64px;
  padding: 8px 0;
}

.jiedu-branding {
  min-width: 260px;
  flex: 0 1 390px;
}

.jiedu-branding__link {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 10px;
  color: var(--jd-text);
  text-decoration: none;
}

.jiedu-branding__logo,
.jiedu-branding__mark {
  display: grid;
  width: 42px;
  height: 42px;
  flex: 0 0 42px;
  place-items: center;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--jd-primary), var(--jd-secondary));
  color: #fff;
  object-fit: cover;
  font-size: 19px;
  font-weight: 850;
  box-shadow: 0 6px 16px rgba(15, 36, 55, 0.08);
}

.jiedu-branding__logo {
  background: #fff;
}

.jiedu-branding__text {
  display: flex;
  min-width: 0;
  flex-direction: column;
  line-height: 1.18;
}

.jiedu-branding__text strong {
  color: var(--jd-primary-strong);
  font-size: 18px;
  font-weight: 850;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.jiedu-branding__text small {
  max-width: 330px;
  overflow: hidden;
  color: var(--jd-text-faint);
  font-size: 12px;
  line-height: 1.28;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.jiedu-main-nav {
  min-width: 0;
  flex: 1 1 auto;
}

.jiedu-menu {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  justify-content: center;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
  white-space: nowrap;
}

.jiedu-menu li {
  margin: 0;
}

.jiedu-menu a {
  display: block;
  padding: 7px 8px;
  border-radius: 999px;
  color: var(--jd-text);
  font-size: 14px;
  font-weight: 750;
  line-height: 1.15;
  text-decoration: none;
}

.jiedu-menu a:hover,
.jiedu-menu .current-menu-item > a {
  background: var(--jd-surface);
  color: var(--jd-primary);
  box-shadow: var(--jd-shadow);
}

.jiedu-header-cta {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 8px;
}

.jiedu-header-cta .jiedu-button {
  min-height: 38px;
  padding: 8px 13px;
  font-size: 14px;
  box-shadow: 0 8px 18px rgba(31, 58, 95, 0.14);
}

.jiedu-menu-toggle {
  display: none;
  border: 1px solid var(--jd-border);
  background: var(--jd-surface);
  color: var(--jd-primary);
  box-shadow: none;
}

@media (max-width: 1280px) {
  .jiedu-branding {
    min-width: 240px;
    flex-basis: 340px;
  }
  .jiedu-branding__text small {
    max-width: 260px;
  }
  .jiedu-menu a {
    padding-inline: 6px;
    font-size: 13px;
  }
}

@media (max-width: 1120px) {
  .jiedu-header-cta {
    display: none;
  }
}

@media (max-width: 820px) {
  .jiedu-header-main {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-areas: "brand toggle" "nav nav";
    min-height: 54px;
    gap: 6px 12px;
    padding: 7px 0;
  }

  .jiedu-branding {
    grid-area: brand;
    min-width: 0;
    flex-basis: auto;
  }

  .jiedu-branding__logo,
  .jiedu-branding__mark {
    width: 34px;
    height: 34px;
    flex-basis: 34px;
    border-radius: 10px;
  }

  .jiedu-branding__text strong {
    font-size: 15px;
    white-space: normal;
  }

  .jiedu-branding__text small {
    display: none;
  }

  .jiedu-menu-toggle {
    display: inline-flex;
    grid-area: toggle;
    justify-self: end;
    min-height: 34px;
    padding: 7px 11px;
    font-size: 13px;
  }

  .jiedu-main-nav {
    display: none;
    grid-area: nav;
    width: 100%;
    padding-top: 6px;
  }

  .jiedu-main-nav.is-open {
    display: block;
  }

  .jiedu-menu {
    display: grid;
    grid-template-columns: 1fr;
    gap: 4px;
    padding: 8px;
    border: 1px solid var(--jd-border);
    border-radius: 14px;
    background: var(--jd-surface);
    box-shadow: var(--jd-shadow);
    white-space: normal;
  }

  .jiedu-menu a {
    padding: 10px 12px;
    font-size: 14px;
  }
}