/* ==========================================================================
   HEADER.CSS — Sticky Architectural Glass Navigation & Brand Identity
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(222, 227, 239, 0.8);
  transition: background-color var(--transition-base), box-shadow var(--transition-base), padding var(--transition-base);
}

.site-header.is-scrolled {
  background-color: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 84px;
  gap: 24px;
  transition: height var(--transition-base);
}

.site-header.is-scrolled .header-inner {
  height: 74px;
}

/* Brand Identity Logo */
.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  flex-shrink: 0;
}

.brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 11px;
  background: linear-gradient(135deg, var(--sapphire) 0%, var(--french-blue) 100%);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  box-shadow: 0 6px 16px rgba(43, 89, 164, 0.25);
  position: relative;
  overflow: hidden;
}

.brand-mark::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(255,255,255,0.32) 0%, rgba(255,255,255,0) 60%);
  pointer-events: none;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
}

.brand-name {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--sapphire);
}

.brand-sub {
  font-family: var(--font-accent);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.24em;
  color: var(--text-muted);
  margin-top: 3px;
}

/* Desktop Navigation */
.main-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-link {
  padding: 8px 14px;
  border-radius: var(--radius-btn);
  font-family: var(--font-heading);
  font-size: 0.93rem;
  font-weight: 600;
  color: var(--text);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-link:hover,
.nav-link.is-active {
  color: var(--sapphire);
  background-color: var(--background-secondary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-phone {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-heading);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text);
  padding: 8px 12px;
  border-radius: var(--radius-btn);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.header-phone:hover {
  color: var(--sapphire);
  background-color: var(--background-secondary);
}

.header-phone svg {
  color: var(--sapphire);
}

/* Mobile Menu Button */
.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background-color: var(--white);
  align-items: center;
  justify-content: center;
  color: var(--text);
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.menu-toggle:hover {
  border-color: var(--sapphire);
  color: var(--sapphire);
}

/* Mobile Drawer */
.mobile-nav-drawer {
  display: none;
  background-color: var(--white);
  border-bottom: 1px solid var(--border);
  padding: 20px var(--container-pad) 28px;
  box-shadow: var(--shadow-md);
}

.mobile-nav-drawer.is-open {
  display: block;
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 20px;
}

.mobile-nav-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 13px 16px;
  border-radius: 12px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  color: var(--text);
  background-color: var(--background);
}

.mobile-nav-link:hover,
.mobile-nav-link.is-active {
  background-color: var(--lavender);
  color: var(--sapphire);
}

.mobile-nav-cta {
  display: flex;
  flex-direction: column;
  gap: 10px;
}