:root {
  --site-nav-ink: #1d2523;
  --site-nav-muted: #64706d;
  --site-nav-line: #d8d5cd;
  --site-nav-panel: #ffffff;
  --site-nav-active: #0f766e;
  --site-nav-active-soft: #e0f2ef;
}

.primary-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  width: 100%;
}

.primary-nav--sidebar {
  grid-template-columns: 1fr;
}

.primary-nav__item {
  display: inline-flex;
  min-width: 0;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  padding: 8px 12px;
  border: 1px solid var(--site-nav-line);
  border-radius: 8px;
  background: var(--site-nav-panel);
  color: var(--site-nav-ink);
  font-family: Inter, "Segoe UI", Arial, "Microsoft YaHei", sans-serif;
  font-size: 14px;
  font-weight: 800;
  line-height: 1.25;
  text-align: center;
  text-decoration: none;
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease,
    transform 0.15s ease;
}

.primary-nav__item:hover,
.primary-nav__item:focus-visible {
  border-color: var(--site-nav-active);
  color: var(--site-nav-active);
  outline: none;
  transform: translateY(-1px);
}

.primary-nav__item.is-active,
.primary-nav__item[aria-current="page"] {
  border-color: var(--site-nav-active);
  background: var(--site-nav-active-soft);
  color: var(--site-nav-active);
}

.mock-exam-shortcut {
  display: none;
}

@media (max-width: 980px) {
  .mock-exam-shortcut {
    position: fixed;
    top: 14px;
    right: 14px;
    z-index: 69;
    display: inline-flex;
    min-height: 42px;
    align-items: center;
    justify-content: center;
    padding: 8px 13px;
    border: 1px solid var(--site-nav-active);
    border-radius: 8px;
    background: var(--site-nav-active);
    box-shadow: 0 10px 24px rgba(15, 23, 42, 0.16);
    color: #ffffff;
    font-family: Inter, "Segoe UI", Arial, "Microsoft YaHei", sans-serif;
    font-size: 14px;
    font-weight: 800;
    line-height: 1.2;
    text-decoration: none;
  }

  body.sidebar-open .mock-exam-shortcut {
    opacity: 0;
    pointer-events: none;
  }
}

@media (max-width: 390px) {
  .primary-nav__item {
    padding-inline: 9px;
  }

  .mock-exam-shortcut {
    right: 10px;
  }
}