/*
  Sticky Navigation Bar Styles
  ----------------------------
  Controls the layout, glass effect, and responsive behavior of the top navigation.
*/

.site-header {
  --header-height: 7rem;
  --header-gutter: clamp(1.5rem, 5vw, 4rem);
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  display: flex;
  align-items: center;
  z-index: 1000;
  padding: 0 var(--header-gutter);
  background: rgba(5, 6, 8, 0);
  backdrop-filter: blur(0px);
  -webkit-backdrop-filter: blur(0px);
  transition: background 220ms ease, backdrop-filter 220ms ease,
    -webkit-backdrop-filter 220ms ease, box-shadow 220ms ease;
}

.site-header--solid {
  background: rgba(5, 6, 8, 0.65);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 18px 35px rgba(0, 0, 0, 0.18);
}

.site-header__inner {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(1rem, 4vw, 2.5rem);
}

.site-header a,
.site-header button,
.site-nav__link {
  font-family: "IBM Plex Sans JP", "Inter", sans-serif;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
  transition: color 160ms ease, opacity 160ms ease, transform 160ms ease,
    background 160ms ease, box-shadow 160ms ease;
}

.site-header a:hover,
.site-header a:focus-visible,
.site-nav__link:hover,
.site-nav__link:focus-visible {
  color: hsl(var(--accent));
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
}

.site-brand img {
  height: clamp(1.75rem, 3vw, 2.75rem);
  width: auto;
  border-radius: 0;
  object-fit: contain;
  box-shadow: none;
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  z-index: 1;
}

.site-nav__list {
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: clamp(1.5rem, 4vw, 2.75rem);
  margin: 0;
  padding: 0;
}

.site-nav__link {
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.9;
}

.site-nav__link.active {
  color: hsl(var(--accent));
}

.site-header__group {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: clamp(1.25rem, 3vw, 2.4rem);
  position: relative;
}

.nav-voice-button {
  position: relative;
  width: 2.6rem;
  height: 2.6rem;
  border-radius: 0.75rem;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.08);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: url("data:image/svg+xml;base64,PHN2ZyB4bWxucz0naHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmcnIHdpZHRoPSczNicgaGVpZ2h0PSczNicgdmlld0JveD0nMCAwIDM2IDM2Jz48Y2lyY2xlIGN4PScxMicgY3k9JzEyJyByPScxMScgZmlsbD0nbm9uZScgc3Ryb2tlPScjNjNkM2ZmJyBzdHJva2Utd2lkdGg9JzInLz48Y2lyY2xlIGN4PScxMicgY3k9JzEyJyByPSc2JyBmaWxsPScjNjNkM2ZmJyBvcGFjaXR5PScwLjM1Jy8+PHBhdGggZmlsbD0nI2Y1ZjVmNScgZD0nTTYgM2w2LjYgMTkuMiAyLTYuMiA2LjIgNi4yIDEuOC0xLjgtNi4yLTYuMiA2LjItMnonLz48L3N2Zz4=")
      10 10,
    pointer;
  transition: transform 180ms ease, box-shadow 180ms ease,
    border-color 180ms ease, background 180ms ease;
  overflow: hidden;
}

.nav-voice-button .icon {
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-voice-button svg {
  width: 1.1rem;
  height: 1.1rem;
}

.nav-voice-button .icon-mic-off {
  display: none;
}

.nav-voice-button:hover,
.nav-voice-button:focus-visible {
  transform: translateY(-1px) scale(1.04);
  background: hsla(var(--accent), 0.12);
  border-color: hsla(var(--accent), 0.35);
  box-shadow: 0 14px 30px hsla(var(--accent), 0.32);
  color: hsl(var(--accent));
}

.nav-voice-button.is-listening {
  border-color: hsla(var(--accent), 0.65);
  background: hsla(var(--accent), 0.16);
  box-shadow: 0 18px 32px hsla(var(--accent), 0.4);
}

.nav-voice-button.is-listening .icon-mic {
  display: none;
}

.nav-voice-button.is-listening .icon-mic-off {
  display: flex;
  animation: pulse 1.2s infinite;
}

.site-header__menu {
  display: none;
  position: relative;
  width: 3rem;
  height: 3rem;
  border-radius: 0.9rem;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.08);
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.site-header__menu span {
  position: relative;
  width: 1.4rem;
  height: 2px;
  background: rgba(255, 255, 255, 0.85);
  border-radius: 999px;
  transition: background 160ms ease;
}

.site-header__menu span::before,
.site-header__menu span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: rgba(255, 255, 255, 0.85);
  border-radius: 999px;
  transition: transform 220ms ease, top 220ms ease, bottom 220ms ease,
    background 160ms ease;
}

.site-header__menu span::before {
  top: -6px;
}

.site-header__menu span::after {
  bottom: -6px;
}

.site-header.is-menu-open .site-header__menu span {
  background: transparent;
}

.site-header.is-menu-open .site-header__menu span::before {
  top: 0;
  transform: rotate(45deg);
}

.site-header.is-menu-open .site-header__menu span::after {
  bottom: 0;
  transform: rotate(-45deg);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 992px) {
  .site-nav__list {
    gap: clamp(1.25rem, 4vw, 2rem);
  }
}

@media (max-width: 1024px) {
  .site-header__menu {
    display: inline-flex;
  }

  .site-header__group {
    gap: 0.5rem;
  }

  .site-nav {
    position: fixed;
    top: calc(var(--header-height) + 0.6rem);
    left: var(--header-gutter);
    width: min(15.5rem, calc(100vw - 2 * var(--header-gutter)));
    padding: 1.35rem 1.4rem 1.9rem;
    border-radius: 1.1rem;
    background: rgba(5, 6, 8, 0.92);
    backdrop-filter: blur(26px);
    -webkit-backdrop-filter: blur(26px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 20px 45px rgba(3, 4, 6, 0.28);
    flex-direction: column;
    align-items: flex-start;
    gap: 1.1rem;
    pointer-events: none;
    visibility: hidden;
    opacity: 0;
    transform: translateY(-12px);
    transition: opacity 220ms ease, transform 220ms ease;
  }

  .site-header.is-menu-open .site-nav {
    pointer-events: auto;
    visibility: visible;
    opacity: 1;
    transform: translateY(0);
  }

  .site-nav__list {
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: 1.1rem;
    margin: 0;
  }

  .site-nav__link {
    font-size: 0.78rem;
    letter-spacing: 0.08em;
    line-height: 1.1;
  }

  .site-nav__link::after {
    content: none;
  }
}

@media (max-width: 520px) {
  .site-header {
    --header-height: 4.25rem;
    --header-gutter: 1.25rem;
    padding: 0 var(--header-gutter);
  }

  .site-brand img {
    height: 2.2rem;
  }

  .nav-voice-button {
    width: 2.4rem;
    height: 2.4rem;
  }

  .nav-voice-button svg {
    width: 1rem;
    height: 1rem;
  }
}