.header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 1000;
  height: var(--header-h);
  transition: background var(--transition), box-shadow var(--transition),
    backdrop-filter var(--transition);

  &.is-scrolled {
    background: rgba(245, 248, 249, 0.92);
    backdrop-filter: blur(12px);
    box-shadow: 0 1px 0 var(--color-border);

    .header__nav-link,
    .header__phone,
    .header__burger {
      color: var(--color-text);
    }

    .header__logo-img {
      filter: none;
    }
  }

  &:not(.is-scrolled) {
    .header__nav-link,
    .header__phone,
    .header__burger {
      color: #fff;
    }

    .header__logo-img {
      filter: brightness(0) invert(1);
    }
  }
}

.header__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.header__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  z-index: 2;
}

.header__logo-img {
  height: 36px;
  width: auto;
  transition: filter var(--transition);

  @media (max-width: $bp-sm) {
    height: 30px;
  }
}

.header__logo-text {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.header__nav {
  display: flex;
  align-items: center;
  gap: 8px;

  @media (max-width: $bp-lg) {
    display: none;
  }
}

.header__nav-item {
  position: relative;

  &:hover .header__dropdown,
  &:focus-within .header__dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
}

.header__nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 12px;
  font-size: 0.92rem;
  font-weight: 600;
  transition: color var(--transition), opacity var(--transition);

  &:hover {
    opacity: 0.8;
  }

  svg {
    width: 12px;
    height: 12px;
  }
}

.header__dropdown {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  min-width: 240px;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 10px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--transition), visibility var(--transition),
    transform var(--transition);

  a {
    display: block;
    padding: 10px 12px;
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text);
    transition: background var(--transition);

    &:hover {
      background: var(--color-bg-alt);
      color: var(--color-teal);
    }
  }
}

.header__actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-shrink: 0;
}

.header__phone {
  font-weight: 700;
  font-size: 0.95rem;
  white-space: nowrap;

  @media (max-width: $bp-md) {
    display: none;
  }
}

.header__cta {
  @media (max-width: $bp-sm) {
    display: none;
  }
}

.header__burger {
  display: none;
  width: 44px;
  height: 44px;
  place-items: center;
  border-radius: 50%;
  transition: background var(--transition);

  @media (max-width: $bp-lg) {
    display: grid;
  }

  &:hover {
    background: rgba(255, 255, 255, 0.12);
  }

  .header.is-scrolled &:hover {
    background: var(--color-bg-alt);
  }

  span {
    display: block;
    width: 20px;
    height: 2px;
    background: currentColor;
    border-radius: 2px;
    position: relative;
    transition: background var(--transition);

    &::before,
    &::after {
      content: "";
      position: absolute;
      left: 0;
      width: 100%;
      height: 2px;
      background: currentColor;
      border-radius: 2px;
      transition: transform var(--transition);
    }

    &::before {
      top: -6px;
    }

    &::after {
      top: 6px;
    }
  }
}

// Offcanvas
.offcanvas {
  position: fixed;
  inset: 0;
  z-index: 1100;
  pointer-events: none;
}

.offcanvas__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(7, 42, 51, 0.5);
  opacity: 0;
  transition: opacity 0.35s ease;
}

.offcanvas__panel {
  position: absolute;
  top: 0;
  right: 0;
  width: min(100%, 360px);
  height: 100%;
  background: var(--color-surface);
  box-shadow: -12px 0 40px rgba(11, 61, 74, 0.18);
  padding: 24px;
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
  overflow-y: auto;
}

.offcanvas.is-open {
  pointer-events: auto;

  .offcanvas__backdrop {
    opacity: 1;
  }

  .offcanvas__panel {
    transform: none;
  }
}

.offcanvas__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 32px;
}

.offcanvas__close {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: var(--color-text);
  background: var(--color-bg-alt);
  transition: background var(--transition);

  &:hover {
    background: var(--color-border);
  }
}

.offcanvas__nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
}

.offcanvas__link {
  display: block;
  padding: 12px 8px;
  font-size: 1.15rem;
  font-weight: 600;
  border-bottom: 1px solid var(--color-border);
  transition: color var(--transition);

  &:hover {
    color: var(--color-cyan);
  }
}

.offcanvas__sub {
  padding: 4px 8px 12px 16px;
  display: grid;
  gap: 8px;

  a {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    font-weight: 500;

    &:hover {
      color: var(--color-teal);
    }
  }
}

.offcanvas__footer {
  margin-top: 32px;
  display: grid;
  gap: 16px;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);

  .link-phone {
    font-size: 1.1rem;
    color: var(--color-teal);
  }

  .btn {
    width: 100%;
  }
}

body.offcanvas-open {
  overflow: hidden;
}