/* ==========================================
   HEADER.CSS — Sticky header & navigation (Light Theme, No N Logo)
   ========================================== */

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-h);
  z-index: var(--z-header);
  transition:
    background-color var(--dur-base) var(--ease-out),
    border-color     var(--dur-base) var(--ease-out);
}

.site-header.is-scrolled {
  background-color: rgba(255, 255, 255, 0.92); /* Light translucent background */
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--color-border);
}

/* ---------- Inner layout ---------- */
.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: var(--sp-8);
}

/* ---------- Logo ---------- */
.logo {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  flex-shrink: 0;
  text-decoration: none;
  transition: opacity var(--dur-fast) var(--ease-out);
}
.logo:hover { opacity: 0.75; }

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

.logo__title {
  font-family: var(--font-sans);
  font-size: 0.65rem;
  font-weight: var(--fw-semi);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  line-height: 1;
}

.logo__city {
  font-family: var(--font-serif);
  font-size: var(--fs-lg);
  font-weight: var(--fw-normal);
  color: var(--color-text);
  line-height: 1.1;
  letter-spacing: var(--ls-normal);
}

/* ---------- Desktop nav ---------- */
.nav {
  display: flex;
  align-items: center;
  gap: var(--sp-8);
  margin-left: auto;
}

.nav__link {
  font-family: var(--font-sans);
  font-size: var(--fs-xs);
  font-weight: var(--fw-semi);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--color-text-muted);
  position: relative;
  transition: color var(--dur-fast) var(--ease-out);
  padding-block: var(--sp-2);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-accent);
  transition: width var(--dur-base) var(--ease-out);
}

.nav__link:hover,
.nav__link[aria-current="page"] {
  color: var(--color-text);
}

.nav__link:hover::after,
.nav__link[aria-current="page"]::after {
  width: 100%;
}

/* ---------- Header CTA ---------- */
.header-cta {
  margin-left: var(--sp-4);
}

/* ---------- Burger ---------- */
.burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: var(--sp-2);
  margin-left: auto;
  flex-shrink: 0;
}

.burger__line {
  display: block;
  width: 100%;
  height: 1.5px;
  background-color: var(--color-text);
  transform-origin: center;
  transition:
    transform  var(--dur-base) var(--ease-out),
    opacity    var(--dur-fast) var(--ease-out);
}

/* Open state */
.burger[aria-expanded="true"] .burger__line:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}
.burger[aria-expanded="true"] .burger__line:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.burger[aria-expanded="true"] .burger__line:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* ---------- Mobile menu ---------- */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: var(--z-mobile-menu);
  background-color: var(--color-bg);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--sp-24) var(--container-pad);
  pointer-events: none;
  opacity: 0;
  transform: translateY(-10px);
  transition:
    opacity   var(--dur-slow) var(--ease-out),
    transform var(--dur-slow) var(--ease-out);
}

.mobile-menu.is-open {
  pointer-events: auto;
  opacity: 1;
  transform: translateY(0);
}

.mobile-menu__nav {
  display: flex;
  flex-direction: column;
  gap: var(--sp-6);
}

.mobile-menu__item {
  display: flex;
  align-items: baseline;
  gap: var(--sp-4);
}

.mobile-menu__index {
  font-family: var(--font-sans);
  font-size: var(--fs-xs);
  color: var(--color-text-subtle);
  letter-spacing: var(--ls-wide);
  flex-shrink: 0;
  min-width: 2rem;
}

.mobile-menu__link {
  font-family: var(--font-serif);
  font-size: clamp(var(--fs-xl), 6vw, var(--fs-3xl));
  font-weight: var(--fw-normal);
  color: var(--color-text);
  line-height: var(--lh-tight);
  transition: color var(--dur-fast) var(--ease-out);
}

.mobile-menu__link:hover {
  color: var(--color-accent);
}

.mobile-menu__contact {
  margin-top: auto;
  padding-top: var(--sp-12);
}

.mobile-menu__phone {
  font-family: var(--font-sans);
  font-size: var(--fs-md);
  color: var(--color-text-muted);
  transition: color var(--dur-fast) var(--ease-out);
}

.mobile-menu__phone:hover {
  color: var(--color-accent);
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .nav { display: none; }
  .header-cta { display: none; }
  .burger { display: flex; }
}

@media (max-width: 480px) {
  .logo__city { font-size: var(--fs-base); }
}

.logo { gap: var(--sp-3); }
.logo__icon { width: 34px; height: 34px; color: var(--color-accent); flex-shrink: 0; }