:root {
  --primary-color: #1d6e93;
  --primary-color-dark: #005fa3;
  --text-color: #555;
  --text-color-dark: #000;
  --menu-bg: color-mix(in srgb, var(--mds-bg-soft, #111111) 84%, transparent 16%);
  --menu-surface: var(--mds-surface-strong, rgba(245, 241, 232, 0.08));
  --menu-border: var(--mds-border, rgba(245, 241, 232, 0.12));
  --menu-border-strong: var(--mds-border-strong, rgba(245, 241, 232, 0.22));
  --menu-text: var(--mds-text, #f5f1e8);
  --menu-muted: var(--mds-muted, rgba(245, 241, 232, 0.72));
  --menu-accent: var(--mds-accent, #f1ece2);
  --menu-accent-soft: var(--mds-accent-soft, rgba(241, 236, 226, 0.14));
  --menu-button-bg: var(--mds-button-bg, var(--menu-accent));
  --menu-button-text: var(--mds-button-text, #080808);
}

body {
  margin: 0;
  font-family: "Manrope", sans-serif;
}

.topnav {
  position: sticky;
  top: 18px;
  z-index: 120;
  background: transparent;
}

.topnav .container {
  position: relative;
  width: min(calc(100% - 32px), 1240px);
  max-width: 100%;
  margin: 0 auto;
  padding: 14px 18px;
  box-sizing: border-box;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto auto;
  align-items: center;
  gap: 12px;
  border: 1px solid var(--menu-border);
  border-radius: 999px;
  background: color-mix(in srgb, var(--mds-bg, #080808) 76%, transparent 24%);
  backdrop-filter: blur(18px);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.2);
  isolation: isolate;
}

.topnav .container > * {
  min-width: 0;
}

.logo {
  display: inline-flex;
  align-items: center;
  position: relative;
  width: clamp(152px, 24vw, 220px);
  height: 38px;
}

.logo-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: opacity 0.2s ease;
}

.logo-img--light {
  opacity: 0;
}

:root[data-theme="light"] .logo-img--dark {
  opacity: 0;
}

:root[data-theme="light"] .logo-img--light {
  opacity: 1;
}

.menu {
  display: flex;
  justify-content: center;
  min-width: 0;
}

.topnav__links {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px;
  border-radius: 999px;
  border: 1px solid var(--menu-border);
  background: var(--menu-surface);
}

.topnav__links a {
  padding: 10px 15px;
  border-radius: 999px;
  color: var(--menu-muted);
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.topnav__links a:hover,
.topnav__links a:focus-visible,
.topnav__links a.active {
  background: var(--menu-accent-soft);
  color: var(--menu-text);
  outline: none;
}

.topnav__links .book-btn {
  background: var(--menu-button-bg);
  color: var(--menu-button-text);
}

.topnav__links .book-btn:hover,
.topnav__links .book-btn:focus-visible,
.topnav__links .book-btn.active {
  background: color-mix(in srgb, var(--menu-accent) 90%, var(--menu-text) 10%);
  color: var(--menu-button-text);
}

.topnav__desktop-tools,
.topnav__mobile-tools {
  display: flex;
  align-items: center;
  gap: 10px;
}

.topnav__mobile-tools {
  display: none;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px;
  border-radius: 999px;
  border: 1px solid var(--menu-border);
  background: var(--menu-surface);
}

.lang-switch a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 42px;
  padding: 8px 12px;
  border-radius: 999px;
  color: var(--menu-muted);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease;
}

.lang-switch a:hover,
.lang-switch a:focus-visible {
  background: var(--menu-accent-soft);
  color: var(--menu-text);
  outline: none;
}

.lang-switch a.is-active,
.lang-switch a.is-active:hover,
.lang-switch a.is-active:focus-visible {
  background: var(--menu-button-bg);
  color: var(--menu-button-text);
  -webkit-text-fill-color: var(--menu-button-text);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--menu-button-bg) 84%, transparent 16%);
  outline: none;
}

.topnav__theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  min-width: 122px;
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid var(--menu-border);
  background: var(--menu-surface);
  color: var(--menu-text);
  cursor: pointer;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.topnav__theme-toggle:hover,
.topnav__theme-toggle:focus-visible,
.burger:hover,
.burger:focus-visible {
  outline: none;
  border-color: var(--menu-border-strong);
  box-shadow: 0 0 0 3px var(--menu-accent-soft);
}

.topnav__theme-toggle:hover {
  transform: translateY(-1px);
}

.topnav__theme-track {
  width: 42px;
  height: 24px;
  padding: 2px;
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  background: color-mix(in srgb, var(--menu-text) 14%, transparent 86%);
}

.topnav__theme-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--menu-accent);
  transform: translateX(0);
  transition: transform 0.2s ease;
}

:root[data-theme="light"] .topnav__theme-thumb {
  transform: translateX(18px);
}

.topnav__theme-label {
  min-width: 4.8rem;
  font-size: 0.88rem;
  font-weight: 700;
  white-space: nowrap;
  text-align: left;
}

.burger {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  aspect-ratio: 1 / 1;
  flex: 0 0 44px;
  border: 1px solid var(--menu-border);
  border-radius: 999px;
  background: var(--menu-surface);
  color: var(--menu-text);
  line-height: 0;
  touch-action: manipulation;
  position: relative;
  cursor: pointer;
}

.burger span {
  position: absolute;
  left: 12px;
  right: 12px;
  height: 2px;
  border-radius: 999px;
  background: currentColor;
  transition: transform 0.25s ease, top 0.25s ease, opacity 0.2s ease;
}

.burger span:nth-child(1) {
  top: 14px;
}

.burger span:nth-child(2) {
  top: 20px;
}

.burger span:nth-child(3) {
  top: 26px;
}

.topnav.open .burger span:nth-child(1) {
  top: 20px;
  transform: rotate(45deg);
}

.topnav.open .burger span:nth-child(2) {
  opacity: 0;
}

.topnav.open .burger span:nth-child(3) {
  top: 20px;
  transform: rotate(-45deg);
}

@media (max-width: 1100px) {
  .topnav {
    top: 12px;
  }

  .topnav .container {
    width: min(calc(100% - 20px), 1240px);
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 10px;
    padding: 10px 12px;
    border-radius: 28px;
    overflow: visible;
  }

  .logo {
    width: clamp(124px, 38vw, 156px);
    height: 26px;
  }

  .topnav__desktop-tools {
    display: none;
  }

  .burger {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    justify-self: end;
    width: 46px;
    height: 46px;
    flex-basis: 46px;
  }

  .menu {
    position: absolute;
    left: 0;
    right: 0;
    top: calc(100% + 8px);
    display: grid;
    gap: 10px;
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    pointer-events: none;
    transform: translateY(-8px);
    transition: max-height 0.22s ease, opacity 0.22s ease, transform 0.22s ease;
  }

  .topnav.open .menu {
    max-height: min(420px, calc(100dvh - 92px));
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .topnav__links {
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    padding: 8px;
    max-height: min(420px, calc(100dvh - 92px));
    overflow-y: auto;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
    border-radius: 22px;
    background: color-mix(in srgb, var(--mds-bg-soft, #111111) 92%, transparent 8%);
    box-shadow: 0 18px 34px rgba(0, 0, 0, 0.24);
  }

  .topnav__links a {
    width: 100%;
    padding: 9px 12px;
    border: 1px solid var(--menu-border);
    text-align: left;
    background: color-mix(in srgb, var(--mds-bg-soft, #111111) 80%, transparent 20%);
  }

  .topnav__mobile-tools {
    display: grid;
    grid-template-columns: 1fr;
    align-items: stretch;
    gap: 8px;
    padding-top: 6px;
    border-top: 1px solid var(--menu-border);
  }

  .topnav__mobile-tools .lang-switch {
    width: 100%;
    justify-content: flex-start;
    gap: 2px;
    padding: 3px;
  }

  .topnav__mobile-tools .lang-switch a {
    flex: 1 1 0;
    min-width: 0;
    padding: 8px 10px;
    font-size: 0.76rem;
    letter-spacing: 0.05em;
    white-space: nowrap;
  }

  .topnav__mobile-tools .topnav__theme-toggle {
    width: 100%;
    min-width: 0;
    padding: 9px 12px;
    gap: 8px;
    justify-content: space-between;
  }

  .topnav__mobile-tools .topnav__theme-label {
    min-width: 0;
    font-size: 0.76rem;
    text-align: right;
  }
}