/* ========================================
   Header & Navigation — refined editorial
   ======================================== */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 20px 0;
  transition: padding var(--transition), background var(--transition), border-color var(--transition);
  background: transparent;
}

.site-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(7, 9, 27, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-hairline);
  opacity: 0;
  transition: opacity var(--transition);
  z-index: -1;
  pointer-events: none;
}

.site-header.scrolled {
  padding: 14px 0;
}

.site-header.scrolled::before {
  opacity: 1;
}

.header-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.header-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-brand);
  font-style: normal;
  font-weight: 700;
  font-size: 1.375rem;
  letter-spacing: -0.005em;
  color: var(--color-text-primary);
  text-decoration: none;
  position: relative;
  line-height: 1;
}

.header-logo-mark {
  width: 36px;
  height: 36px;
  display: block;
  object-fit: contain;
  flex-shrink: 0;
}

.header-logo-text {
  display: inline-flex;
  align-items: baseline;
}

.header-logo-40 {
  height: 1.05em;
  width: auto;
  display: inline-block;
  vertical-align: middle;
  margin-left: 2px;
  margin-bottom: -0.15em;
  object-fit: contain;
}

.header-logo:hover {
  color: var(--color-text-primary);
}

.header-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  gap: 36px;
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition);
  position: relative;
  letter-spacing: 0.01em;
}

.nav-link::before {
  content: '';
  position: absolute;
  left: -14px;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--color-accent);
  opacity: 0;
  transition: opacity var(--transition);
}

.nav-link:hover {
  color: var(--color-text-primary);
}

.nav-link:hover::before {
  opacity: 1;
}

.header-cta {
  padding: 10px 22px;
  font-size: 0.875rem;
}

/* --- Mobile Toggle --- */
.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  padding: 8px;
  z-index: 1001;
}

.hamburger-line {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: all var(--transition);
}

.mobile-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {
  transform: rotate(45deg) translate(6px, 6px);
}

.mobile-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) {
  opacity: 0;
}

.mobile-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* --- Mobile Nav Overlay --- */
.mobile-nav {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(7, 9, 27, 0.96);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  z-index: 999;
  padding: 120px 32px 32px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
}

.mobile-nav.active {
  opacity: 1;
  visibility: visible;
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.mobile-nav-link {
  font-family: var(--font-heading);
  font-style: italic;
  font-size: 2rem;
  font-weight: 400;
  color: var(--color-text-primary);
  padding: 20px 0;
  transition: color var(--transition), padding-left var(--transition);
  border-bottom: 1px solid var(--color-hairline);
  display: block;
  letter-spacing: -0.01em;
}

.mobile-nav-link:hover,
.mobile-nav-link:focus-visible {
  color: var(--color-accent);
  padding-left: 12px;
}

.mobile-cta {
  margin-top: 40px;
  width: 100%;
  justify-content: center;
  padding: 18px;
  font-size: 1rem;
}