/* Stable mobile navigation. Loaded last to resolve the legacy nav cascade. */
.arena-theme-control-title,
.arena-theme-choice-label {
  display: none;
}

@media (max-width: 980px) {
  html.mobile-nav-open,
  html.mobile-nav-open body {
    overflow: hidden;
  }

  .topbar {
    position: sticky !important;
    top: 0 !important;
    z-index: 30000 !important;
    overflow: visible !important;
  }

  .topbar .nav {
    position: relative !important;
    z-index: 30001 !important;
    overflow: visible !important;
  }

  .topbar .mobile-menu {
    position: relative !important;
    z-index: 30003 !important;
    display: flex !important;
    width: auto !important;
    min-width: 72px !important;
    height: 44px !important;
    margin-left: auto !important;
    align-items: center !important;
    justify-content: center !important;
    gap: 0 !important;
    padding: 0 14px !important;
    overflow: hidden !important;
  }

  .topbar .mobile-menu span {
    display: none !important;
  }

  .topbar .mobile-menu b {
    position: static !important;
    width: auto !important;
    height: auto !important;
    overflow: visible !important;
    clip: auto !important;
    font-size: 14px !important;
    line-height: 1 !important;
    white-space: nowrap !important;
  }

  .topbar .nav-links,
  html[data-arena-design="v3"] .topbar .nav-links {
    position: fixed !important;
    inset: 78px 8px 8px !important;
    z-index: 30002 !important;
    display: none !important;
    width: auto !important;
    height: calc(100dvh - 86px) !important;
    min-height: 0 !important;
    max-height: none !important;
    box-sizing: border-box;
    overflow-x: hidden !important;
    overflow-y: auto !important;
    overscroll-behavior: contain;
    padding: 18px !important;
    border: 1px solid rgba(255, 255, 255, .10) !important;
    border-radius: 22px !important;
    background:
      radial-gradient(circle at 100% 0%, rgba(211, 43, 15, .18), transparent 34%),
      #0d0a0a !important;
    box-shadow:
      0 30px 90px rgba(0, 0, 0, .72),
      inset 0 1px 0 rgba(255, 255, 255, .04) !important;
  }

  .topbar .nav-links.open,
  html[data-arena-design="v3"] .topbar .nav-links.open {
    display: flex !important;
    flex-direction: column !important;
    flex-wrap: nowrap !important;
    align-content: normal !important;
    align-items: stretch !important;
    justify-content: flex-start !important;
    gap: 3px !important;
  }

  .topbar .nav-links > a,
  .topbar .nav-links > button,
  .topbar .nav-links > form > button {
    display: flex !important;
    width: 100% !important;
    min-height: 52px !important;
    flex: 0 0 auto !important;
    align-items: center !important;
    justify-content: flex-start !important;
    box-sizing: border-box;
    margin: 0 !important;
    padding: 0 15px !important;
    border: 0 !important;
    border-radius: 13px !important;
    color: rgba(248, 244, 242, .92) !important;
    background: transparent !important;
    box-shadow: none !important;
    font-size: 17px !important;
    font-weight: 850 !important;
    letter-spacing: -.02em !important;
    white-space: normal !important;
    transform: none !important;
  }

  .topbar .nav-links > a::after {
    display: none !important;
  }

  .topbar .nav-links > a:hover,
  .topbar .nav-links > a:active,
  .topbar .nav-links > a[aria-current="page"] {
    color: #fff !important;
    background: rgba(221, 52, 24, .14) !important;
    transform: none !important;
  }

  .topbar .nav-links > a.button {
    justify-content: center !important;
    text-align: center !important;
  }

  .topbar .nav-links > form {
    width: 100% !important;
    flex: 0 0 auto !important;
    margin: 0 !important;
  }

  .topbar .nav-links > form:last-child {
    margin-top: 8px !important;
  }

  .topbar .nav-links > form:last-child > button {
    min-height: 50px !important;
    justify-content: center !important;
    border: 1px solid rgba(255, 255, 255, .10) !important;
    color: #fff !important;
    background: rgba(255, 255, 255, .055) !important;
  }

  .topbar .nav-links > .curator-queue-nav-v2 {
    width: 100% !important;
    min-width: 0 !important;
    height: 52px !important;
    flex: 0 0 auto !important;
    justify-content: flex-start !important;
    padding: 0 15px !important;
  }

  .topbar .nav-links > .curator-queue-nav-v2::before {
    display: none !important;
  }

  .topbar .nav-links > .install-app-button[hidden] {
    display: none !important;
  }

  .topbar .nav-links > .arena-theme-control-v3 {
    display: grid !important;
    grid-template-columns: repeat(3, minmax(0, 1fr)) !important;
    width: 100% !important;
    height: auto !important;
    min-height: 0 !important;
    flex: 0 0 auto !important;
    gap: 6px !important;
    box-sizing: border-box;
    margin: 10px 0 0 !important;
    padding: 8px !important;
    overflow: visible !important;
    border: 1px solid rgba(255, 255, 255, .09) !important;
    border-radius: 16px !important;
    background: rgba(255, 255, 255, .035) !important;
    box-shadow: none !important;
    transform: none !important;
  }

  .topbar .nav-links .arena-theme-toggle-thumb {
    display: none !important;
  }

  .topbar .nav-links .arena-theme-control-title {
    display: block !important;
    grid-column: 1 / -1;
    padding: 2px 4px 4px;
    color: rgba(248, 244, 242, .58);
    font-size: 11px;
    font-weight: 800;
    line-height: 1;
    letter-spacing: .12em;
    text-transform: uppercase;
  }

  .topbar .nav-links .arena-theme-choice-v3 {
    display: flex !important;
    width: 100% !important;
    height: 52px !important;
    min-height: 52px !important;
    align-items: center !important;
    justify-content: center !important;
    flex-direction: column !important;
    gap: 4px !important;
    box-sizing: border-box;
    padding: 6px 4px !important;
    border: 1px solid transparent !important;
    border-radius: 11px !important;
    color: rgba(248, 244, 242, .62) !important;
    background: transparent !important;
    box-shadow: none !important;
    transform: none !important;
  }

  .topbar .nav-links .arena-theme-choice-v3 svg {
    width: 17px !important;
    height: 17px !important;
    flex: 0 0 17px;
  }

  .topbar .nav-links .arena-theme-choice-label {
    display: block !important;
    font-size: 11px;
    font-weight: 750;
    line-height: 1;
    white-space: nowrap;
  }

  .topbar .nav-links .arena-theme-choice-v3.is-active {
    border-color: rgba(226, 62, 31, .38) !important;
    color: #fff !important;
    background: rgba(211, 43, 15, .18) !important;
  }

  .topbar .nav-links .arena-theme-system-v3::after {
    display: none !important;
  }

  html[data-theme="dark"] .topbar .nav-links,
  html[data-theme="dark"][data-arena-design="v3"] .topbar .nav-links {
    background: #0d0a0a !important;
  }

  html[data-theme="light"] .topbar .nav-links,
  html[data-theme="light"][data-arena-design="v3"] .topbar .nav-links {
    border-color: rgba(48, 34, 31, .12) !important;
    background: #fbf9f8 !important;
    box-shadow:
      0 30px 80px rgba(52, 37, 33, .24),
      inset 0 1px 0 #fff !important;
  }

  html[data-theme="light"] .topbar .nav-links > a,
  html[data-theme="light"] .topbar .nav-links > button,
  html[data-theme="light"] .topbar .nav-links > form > button {
    color: #211b1a !important;
  }

  html[data-theme="light"] .topbar .nav-links > .arena-theme-control-v3 {
    border-color: rgba(48, 34, 31, .11) !important;
    background: rgba(48, 34, 31, .035) !important;
  }

  html[data-theme="light"] .topbar .nav-links .arena-theme-control-title {
    color: rgba(33, 27, 26, .55);
  }

  html[data-theme="light"] .topbar .nav-links .arena-theme-choice-v3 {
    color: rgba(33, 27, 26, .68) !important;
  }

  html[data-theme="light"] .topbar .nav-links .arena-theme-choice-v3.is-active {
    border-color: rgba(178, 32, 0, .24) !important;
    color: #8f1c06 !important;
    background: rgba(178, 32, 0, .09) !important;
  }
}

@media (max-width: 620px) {
  .topbar .nav,
  html[data-arena-design] .topbar .nav {
    gap: 8px !important;
    justify-content: flex-start !important;
  }

  .topbar .brand-plan-badge,
  html[data-arena-design] .topbar .brand-plan-badge {
    display: none !important;
  }

  .topbar .exam-world-switch,
  html[data-arena-design] .topbar .exam-world-switch {
    grid-template-columns: minmax(0, 1fr) !important;
    width: auto !important;
    min-width: 0 !important;
    margin-left: auto !important;
  }

  .topbar .exam-world-switch button,
  html[data-arena-design] .topbar .exam-world-switch button {
    min-width: 46px !important;
    padding-inline: 9px !important;
  }

  .topbar .curator-header-chat,
  html[data-arena-design] .topbar .curator-header-chat {
    margin-left: 0 !important;
  }

  .topbar .mobile-menu,
  html[data-arena-design] .topbar .mobile-menu,
  .topbar .curator-header-chat + .mobile-menu {
    min-width: 68px !important;
    margin-left: 0 !important;
    padding-inline: 12px !important;
  }

  .topbar .nav-links,
  html[data-arena-design="v3"] .topbar .nav-links {
    inset: 74px 6px 6px !important;
    height: calc(100dvh - 80px) !important;
    padding: 13px !important;
    border-radius: 19px !important;
  }

  .topbar .nav-links > a,
  .topbar .nav-links > button,
  .topbar .nav-links > form > button {
    min-height: 49px !important;
    padding-inline: 13px !important;
    font-size: 16px !important;
  }
}

/* Быстрый вход в чаты кураторов из шапки. */
.topbar .curator-header-chat {
  display: flex;
  width: 44px;
  min-width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  margin-left: auto;
  border: 1px solid rgba(226, 62, 31, .34);
  border-radius: 14px;
  color: #f25b3b;
  background: rgba(211, 43, 15, .12);
  box-shadow: none;
  transition: background .18s ease, border-color .18s ease, transform .18s ease;
}

.topbar .curator-header-chat:hover,
.topbar .curator-header-chat:focus-visible {
  border-color: rgba(238, 82, 47, .66);
  background: rgba(211, 43, 15, .22);
  transform: translateY(-1px);
}

.topbar .curator-header-chat img {
  display: block;
  width: 30px;
  height: 30px;
  object-fit: contain;
  transform: translateY(2px);
}

@media (max-width: 980px) {
  .topbar .curator-header-chat {
    position: relative;
    z-index: 30003;
    margin-left: auto;
  }

  .topbar .curator-header-chat + .mobile-menu {
    margin-left: 8px !important;
  }
}

html[data-theme="light"] .topbar .curator-header-chat {
  border-color: rgba(178, 32, 0, .22);
  color: #a82812;
  background: rgba(178, 32, 0, .08);
}

/* Final narrow-header authority: keep every control inside the viewport. */
@media (max-width: 620px) {
  .topbar .curator-header-chat + .mobile-menu,
  html[data-arena-design] .topbar .curator-header-chat + .mobile-menu {
    margin-left: 0 !important;
  }
}