/* ==========================================================================
   Block 1 — Header
   ========================================================================== */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: transparent;
  color: var(--color-text-inverse);
  border-bottom: 1px solid transparent;
  transition: background-color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}
.site-header.is-scrolled {
  background: var(--color-ink);
  border-bottom-color: var(--color-border-dark);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
  height: 76px;
}

.site-header__logo img { height: 46px; width: auto; display: block; }

.site-nav ul {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.site-nav a {
  font-size: var(--fs-small);
  font-weight: 500;
  color: var(--color-text-inverse);
  position: relative;
  padding-block: 4px;
  white-space: nowrap;
}
.site-nav a::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 1px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-fast) var(--ease-out);
}
.site-nav a:hover::after { transform: scaleX(1); }

.site-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.site-header__phone {
  font-size: var(--fs-small);
  font-weight: 600;
  white-space: nowrap;
}
.site-header__phone:hover { color: var(--color-accent); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
}
.nav-toggle span {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--color-text-inverse);
  transition: transform var(--dur-fast) var(--ease-out), opacity var(--dur-fast) var(--ease-out);
}

body.nav-locked { overflow: hidden; }

@media (max-width: 900px) {
  .site-header__phone { display: none; }

  .nav-toggle { display: flex; }

  .site-nav {
    position: fixed;
    inset: 76px 0 0 0;
    background: var(--color-ink);
    padding: var(--space-lg) var(--container-pad);
    transform: translateX(100%);
    transition: transform var(--dur-med) var(--ease-out);
    overflow-y: auto;
  }
  .site-nav.is-open { transform: translateX(0); }

  .site-nav ul {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-md);
  }
  .site-nav a { font-size: var(--fs-h3); font-family: var(--font-display); color: var(--color-text-inverse); }

  .site-header__actions .btn { padding: 0.75rem 1.1rem; font-size: 0.8rem; }
}

@media (max-width: 480px) {
  .site-header__actions .btn span { display: none; }
}