.site-header {
  position: sticky;
  top: 0;
  z-index: 1001;
  background: var(--color-white);
  padding: clamp(16px, 2.5vw, 28px) 0;
  transition: box-shadow var(--transition), border-color var(--transition);
}

.site-header.is-scrolled {
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(16px, 3vw, 48px);
}

.site-header__brand {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex-shrink: 0;
}

.site-header__logo {
  font-size: clamp(1.125rem, 2vw, 1.5rem);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  line-height: 1.2;
}

.site-header__tagline {
  font-size: clamp(0.75rem, 1.2vw, 0.875rem);
  font-weight: 400;
  color: var(--color-black);
  line-height: 1.3;
}

.site-header__right {
  display: flex;
  align-items: center;
  gap: clamp(24px, 4vw, 64px);
  margin-left: auto;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(16px, 2vw, 32px);
  position: relative;
  z-index: 2;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(20px, 3vw, 48px);
}

.site-nav__list a {
  position: relative;
  font-size: clamp(0.6875rem, 1vw, 0.8125rem);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-gray);
  transition: color var(--transition);
  white-space: nowrap;
}

.site-nav__list a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 100%;
  height: 1px;
  background: var(--color-black);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.site-nav__list a:hover,
.site-nav__list a.is-active {
  color: var(--color-black);
}

.site-nav__list a:hover::after,
.site-nav__list a.is-active::after {
  transform: scaleX(1);
}

.site-nav__list--full,
.site-nav__list--extended {
  display: none;
}

.site-nav__toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  padding: 4px;
  background: none;
  border: none;
  cursor: pointer;
  flex-shrink: 0;
  position: relative;
  z-index: 1002;
}

.site-nav__toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-black);
  transition: transform var(--transition), opacity var(--transition);
}

.site-nav__toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.site-nav__toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.site-nav__toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-nav__panel {
  display: none;
}

.site-nav__panel-footer {
  display: none;
}

.site-header__contact {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 2px;
  flex-shrink: 0;
}

.site-header__contact-label {
  font-size: clamp(0.625rem, 0.9vw, 0.75rem);
  color: var(--color-gray-light);
  white-space: nowrap;
}

.site-header__phone {
  font-size: clamp(0.9375rem, 1.5vw, 1.25rem);
  font-weight: 700;
  white-space: nowrap;
  transition: opacity var(--transition);
}

.site-header__phone:hover {
  opacity: 0.7;
}

.nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 1000;
  opacity: 0;
  transition: opacity var(--transition);
}

.nav-overlay.is-visible {
  display: block;
  opacity: 1;
}

@media (min-width: 1025px) {
  .site-nav__panel {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: fixed;
    inset: 0;
    padding: clamp(80px, 10vw, 120px) var(--container-padding);
    background: var(--color-white);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--transition), visibility var(--transition);
    z-index: 1001;
  }

  .site-nav__panel.is-open {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .site-nav__list--extended {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: clamp(24px, 4vw, 40px);
  }

  .site-nav__list--extended a {
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    font-weight: 600;
    letter-spacing: 0.06em;
  }

  .site-nav__list--extended a::after {
    bottom: -6px;
    height: 2px;
  }

  .site-nav__panel-footer {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: clamp(20px, 3vw, 32px);
    margin-top: clamp(40px, 6vw, 72px);
  }

  .site-nav__panel-contact {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
  }

  .site-nav__panel-contact-label {
    font-size: 0.75rem;
    color: var(--color-gray-light);
    text-transform: uppercase;
    letter-spacing: 0.08em;
  }

  .site-nav__panel-phone {
    font-size: clamp(1.25rem, 2vw, 1.75rem);
    font-weight: 700;
    transition: opacity var(--transition);
  }

  .site-nav__panel-phone:hover {
    opacity: 0.7;
  }

  .site-nav__panel-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    font-family: inherit;
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-white);
    background: var(--color-black);
    border: none;
    border-radius: 999px;
    cursor: pointer;
    transition: opacity var(--transition);
  }

  .site-nav__panel-cta:hover {
    opacity: 0.85;
  }
}

@media (max-width: 1024px) {
  .site-nav__list--primary {
    display: none;
  }

  .site-nav__panel {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    right: 0;
    width: min(360px, 88vw);
    height: 100vh;
    height: 100dvh;
    padding: 80px 32px 32px;
    background: var(--color-white);
    box-shadow: -4px 0 24px rgba(0, 0, 0, 0.1);
    transform: translateX(100%);
    transition: transform var(--transition);
    z-index: 1;
    overflow-y: auto;
    pointer-events: none;
  }

  .site-nav__panel.is-open {
    transform: translateX(0);
    pointer-events: auto;
  }

  .site-nav__list--full {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
  }

  .site-nav__list--full li {
    width: 100%;
    border-bottom: 1px solid var(--color-gray-bg);
  }

  .site-nav__list--full a {
    display: block;
    padding: 16px 0;
    font-size: 0.875rem;
  }

  .site-nav__panel-footer {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-top: auto;
    padding-top: 32px;
  }

  .site-nav__panel-contact {
    display: flex;
    flex-direction: column;
    gap: 4px;
  }

  .site-nav__panel-contact-label {
    font-size: 0.6875rem;
    color: var(--color-gray-light);
  }

  .site-nav__panel-phone {
    font-size: 1.125rem;
    font-weight: 700;
  }

  .site-nav__panel-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 14px 24px;
    font-family: inherit;
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    text-align: center;
    color: var(--color-white);
    background: var(--color-black);
    border: none;
    border-radius: 999px;
    cursor: pointer;
    transition: opacity var(--transition);
  }

  .site-nav__panel-cta:hover {
    opacity: 0.85;
  }
}

@media (max-width: 640px) {
  .site-header__inner {
    flex-wrap: wrap;
  }

  .site-header__right {
    width: 100%;
    justify-content: space-between;
  }

  .site-header__contact {
    align-items: flex-start;
  }
}