/* ============================================================
   SEIFERT DYNAMICS — Site Header & Navigation
   ============================================================ */

/* ── Site Header ─────────────────────────────────────────── */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  background: rgba(6, 6, 8, 0.0);
  border-bottom: 1px solid transparent;
  transition: background var(--dur-slow) var(--ease-out),
              border-color var(--dur-slow) var(--ease-out),
              opacity var(--dur-base) var(--ease-out),
              transform var(--dur-base) var(--ease-out);
  backdrop-filter: blur(0px);
  -webkit-backdrop-filter: blur(0px);
}

/* Scrolled state — filled background */
.site-header.is-scrolled {
  background: rgba(6, 6, 8, 0.97);
  border-bottom-color: var(--border-dim);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

/* On homepage: initially hidden, revealed after scroll */
.page-home .site-header {
  opacity: 0;
  pointer-events: none;
}

.page-home .site-header.is-visible {
  opacity: 1;
  pointer-events: auto;
}

/* Inner pages: always visible */
.page-inner .site-header {
  opacity: 1;
  pointer-events: auto;
  background: rgba(6, 6, 8, 0.98);
  border-bottom-color: var(--border-dim);
}

/* ── Header Inner Container ──────────────────────────────── */

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  padding-left: var(--container-pad);
  padding-right: var(--container-pad);
  max-width: var(--container-max);
  margin: 0 auto;
}

/* ── Header Logo ─────────────────────────────────────────── */

.header-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  text-decoration: none;
}

.header-logo img {
  height: 38px;
  width: auto;
  object-fit: contain;
}

/* ── Primary Navigation ──────────────────────────────────── */

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

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  list-style: none;
}

.nav-link,
.dropdown-trigger {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--fs-sm);
  font-weight: 400;
  letter-spacing: 0.03em;
  color: var(--text-secondary);
  padding: 0.5rem var(--sp-4);
  border: none;
  background: transparent;
  cursor: pointer;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out);
  white-space: nowrap;
}

.nav-link:hover,
.dropdown-trigger:hover {
  color: var(--text-bright);
  background: rgba(255,255,255,0.04);
}

.nav-link.is-active {
  color: var(--text-bright);
}

/* Dropdown caret */
.dropdown-caret {
  width: 14px;
  height: 14px;
  opacity: 0.5;
  transition: transform var(--dur-fast) var(--ease-out);
}

/* ── Dropdown Menu ───────────────────────────────────────── */

.has-dropdown {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + 0.5rem);
  left: 0;
  min-width: 220px;
  background: rgba(11, 18, 32, 0.98);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-sm);
  padding: var(--sp-3) 0;
  list-style: none;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity var(--dur-base) var(--ease-out),
              visibility var(--dur-base) var(--ease-out),
              transform var(--dur-base) var(--ease-out);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-lg);
  z-index: var(--z-above);
}

.has-dropdown.is-open .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.has-dropdown.is-open .dropdown-caret {
  transform: rotate(180deg);
}

.dropdown-menu a {
  display: block;
  padding: var(--sp-3) var(--sp-6);
  font-size: var(--fs-sm);
  font-weight: 300;
  color: var(--text-secondary);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out);
}

.dropdown-menu a:hover {
  color: var(--text-bright);
  border-left-color: var(--accent);
  background: rgba(255,255,255,0.03);
}

/* ── Header Actions ──────────────────────────────────────── */

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

/* Request a Conversation button */
.btn-request-conv {
  display: inline-flex;
  align-items: center;
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: var(--ls-wider);
  text-transform: uppercase;
  color: var(--text-secondary);
  border: 1px solid var(--border-mid);
  padding: 0.5rem 1.125rem;
  border-radius: var(--radius-xs);
  text-decoration: none;
  transition: color var(--dur-base) var(--ease-out),
              border-color var(--dur-base) var(--ease-out),
              background var(--dur-base) var(--ease-out);
  white-space: nowrap;
}

.btn-request-conv:hover {
  color: var(--text-bright);
  border-color: var(--border-bright);
  background: rgba(255,255,255,0.04);
}

/* Search trigger */
.search-trigger svg {
  width: 18px;
  height: 18px;
}

/* Mobile nav toggle — hidden on desktop */
.mobile-nav-toggle {
  display: none;
}

/* ── Mobile Navigation Overlay ───────────────────────────── */

.mobile-nav-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg-void);
  z-index: var(--z-overlay);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur-slow) var(--ease-out),
              visibility var(--dur-slow) var(--ease-out);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.mobile-nav-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

.mobile-nav-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem var(--container-pad);
  border-bottom: 1px solid var(--border-dim);
  min-height: 68px;
}

.mobile-nav-header .header-logo img {
  height: 32px;
}

.mobile-nav-close {
  color: var(--text-secondary);
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--sp-2);
}

.mobile-nav-close:hover {
  color: var(--text-bright);
}

.mobile-nav-close svg {
  width: 24px;
  height: 24px;
}

.mobile-nav-links {
  flex: 1;
  padding: var(--sp-8) var(--container-pad);
}

.mobile-nav-links > li {
  border-bottom: 1px solid var(--border-dim);
}

.mobile-nav-links > li > a,
.mobile-nav-links > li > button {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--sp-5) 0;
  font-size: var(--fs-xl);
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  transition: color var(--dur-fast) var(--ease-out);
}

.mobile-nav-links > li > a:hover,
.mobile-nav-links > li > button:hover {
  color: var(--text-bright);
}

.mobile-subnav {
  padding: 0 0 var(--sp-4) 0;
  display: none;
}

.mobile-subnav.is-open {
  display: block;
}

.mobile-subnav a {
  display: block;
  padding: var(--sp-3) 0;
  font-size: var(--fs-base);
  font-weight: 300;
  color: var(--text-secondary);
  text-decoration: none;
  border-left: 2px solid var(--border-mid);
  padding-left: var(--sp-5);
  transition: color var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out);
}

.mobile-subnav a:hover {
  color: var(--text-bright);
  border-left-color: var(--accent);
}

.mobile-nav-footer {
  padding: var(--sp-8) var(--container-pad) var(--sp-12);
  border-top: 1px solid var(--border-dim);
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
}

.mobile-nav-footer .btn {
  text-align: center;
  justify-content: center;
}

/* ── Responsive ──────────────────────────────────────────── */

@media (max-width: 1100px) {
  .btn-request-conv {
    display: none;
  }
}

@media (max-width: 900px) {
  .main-nav {
    display: none;
  }
  .mobile-nav-toggle {
    display: inline-flex;
  }
}

@media (max-width: 560px) {
  .header-container {
    height: 60px;
  }
  .header-logo img {
    height: 30px;
  }
}