.exam-site-nav {
  position: relative;
  z-index: 1000;
  background: #fff;
  border-bottom: 1px solid rgba(26, 43, 60, 0.08);
  box-shadow: 0 2px 12px rgba(26, 43, 60, 0.06);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

.exam-site-nav__inner {
  width: min(1180px, calc(100% - 48px));
  min-height: 88px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.exam-site-nav__brand {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
}

.exam-site-nav__brand img {
  display: block;
  width: 250px;
  max-width: 100%;
  height: auto;
}

.exam-site-nav__toggle {
  display: none;
  width: 44px;
  height: 40px;
  padding: 9px 8px;
  background: transparent;
  border: 0;
  cursor: pointer;
}

.exam-site-nav__toggle span {
  display: block;
  height: 2px;
  margin: 5px 0;
  border-radius: 2px;
  background: #1a2b3c;
}

.exam-site-nav__menu,
.exam-site-nav__submenu {
  margin: 0;
  padding: 0;
  list-style: none;
}

.exam-site-nav__menu {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 22px;
}

.exam-site-nav__item {
  position: relative;
}

.exam-site-nav__link {
  display: block;
  padding: 32px 0;
  color: #1a2b3c;
  font-size: 15px;
  font-weight: 600;
  line-height: 24px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s ease;
}

.exam-site-nav__link:hover,
.exam-site-nav__item--current > .exam-site-nav__link {
  color: #3b82f6;
}

.exam-site-nav__submenu {
  position: absolute;
  top: calc(100% - 8px);
  left: 50%;
  width: 168px;
  padding: 8px;
  background: #fff;
  border: 1px solid rgba(46, 61, 98, 0.08);
  border-radius: 12px;
  box-shadow: 0 12px 32px rgba(46, 61, 98, 0.14);
  opacity: 0;
  visibility: hidden;
  transform: translate(-50%, 8px);
  transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s ease;
}

.exam-site-nav__item:hover > .exam-site-nav__submenu,
.exam-site-nav__item:focus-within > .exam-site-nav__submenu {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
}

.exam-site-nav__submenu a {
  display: block;
  padding: 10px 12px;
  border-radius: 8px;
  color: #2e3d62;
  font-size: 14px;
  line-height: 22px;
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s ease, background-color 0.2s ease;
}

.exam-site-nav__submenu a:hover,
.exam-site-nav__submenu a[aria-current="page"] {
  color: #2563eb;
  background: #f1f5ff;
}

@media (max-width: 1100px) {
  .exam-site-nav__inner {
    width: min(100% - 32px, 960px);
    min-height: 74px;
    flex-wrap: wrap;
    gap: 0;
  }

  .exam-site-nav__brand img {
    width: 210px;
  }

  .exam-site-nav__toggle {
    display: block;
  }

  .exam-site-nav__menu {
    display: none;
    flex: 0 0 100%;
    align-items: stretch;
    padding: 8px 0 16px;
  }

  .exam-site-nav.is-open .exam-site-nav__menu {
    display: block;
  }

  .exam-site-nav__link {
    padding: 10px 4px;
  }

  .exam-site-nav__submenu {
    position: static;
    display: none;
    width: auto;
    margin: 0 0 6px 14px;
    padding: 0;
    border: 0;
    border-left: 2px solid #dbeafe;
    border-radius: 0;
    box-shadow: none;
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .exam-site-nav__item.is-open > .exam-site-nav__submenu {
    display: block;
  }
}

@media (max-width: 480px) {
  .exam-site-nav__inner {
    width: calc(100% - 24px);
  }

  .exam-site-nav__brand img {
    width: 180px;
  }
}