/* ==========================================================================
   HEADER — Sticky Navigation, Mobile Menu, Theme Toggle
   ========================================================================== */

/* ---------- Top Bar (Utility strip) ---------- */
.topbar {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  font-size: var(--text-xs);
  padding: var(--space-2) 0;
}

.topbar-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

.topbar-left a {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: rgba(255,255,255,0.85);
  transition: var(--transition-fast);
}

.topbar-left a:hover {
  color: #fff;
}

.topbar-left svg {
  width: 14px;
  height: 14px;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.topbar-right a {
  color: rgba(255,255,255,0.7);
  transition: var(--transition-fast);
}

.topbar-right a:hover {
  color: #fff;
}

.topbar-right svg {
  width: 16px;
  height: 16px;
}

/* ---------- Main Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: var(--overlay-light);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-divider);
  transition: var(--transition-normal);
}

.site-header.scrolled {
  box-shadow: var(--shadow-md);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  gap: var(--space-6);
}

/* ---------- Logo ---------- */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  flex-shrink: 0;
}

.logo-mark {
  width: 46px;
  height: 46px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary), var(--color-gold));
  color: #fff;
  font-weight: var(--weight-extra);
  font-size: var(--text-lg);
  font-family: var(--font-serif);
  transition: var(--transition-normal);
}

.logo-mark svg {
  width: 24px;
  height: 24px;
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-text .brand-name {
  font-family: var(--font-serif);
  font-weight: var(--weight-bold);
  font-size: var(--text-lg);
  line-height: 1.15;
  color: var(--color-text);
  letter-spacing: var(--tracking-wide);
}

.logo-text .brand-tagline {
  font-size: 0.65rem;
  color: #736350; /* WCAG AA compliant contrast ≥ 4.5:1 */
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  font-weight: var(--weight-medium);
}

/* ---------- Desktop Navigation ---------- */
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.main-nav a {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-muted);
  border-radius: var(--radius-md);
  transition: var(--transition-fast);
  white-space: nowrap;
  position: relative;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--color-primary);
  background-color: var(--color-primary-light);
}

/* Dropdown */
.nav-dropdown {
  position: relative;
}

.nav-dropdown-trigger {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  cursor: pointer;
}

.nav-dropdown-trigger svg {
  width: 14px;
  height: 14px;
  transition: transform var(--duration-fast) var(--ease-out);
}

.nav-dropdown:hover .nav-dropdown-trigger svg {
  transform: rotate(180deg);
}

.nav-dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 220px;
  padding: var(--space-2);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: var(--transition-normal);
  z-index: var(--z-dropdown);
}

.nav-dropdown:hover .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-dropdown-menu a {
  display: block;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  border-radius: var(--radius-md);
}

.nav-dropdown-menu a:hover,
.nav-dropdown-menu a.active {
  background-color: var(--color-surface-2);
  color: var(--color-primary);
}

/* ---------- Header Actions ---------- */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* Theme Toggle */
.theme-toggle {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-full);
  background-color: var(--color-surface-2);
  color: var(--color-text);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border: 1px solid var(--color-border);
  transition: var(--transition-fast);
}

.theme-toggle:hover {
  background-color: var(--color-surface-offset);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
}

/* Sun/Moon icons */
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }

[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

/* ---------- Mobile Menu Toggle ---------- */
.mobile-menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  background: none;
  border: none;
  color: var(--color-text);
  position: relative;
  z-index: calc(var(--z-header) + 10);
}

.hamburger {
  width: 22px;
  height: 16px;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: var(--transition-normal);
  transform-origin: center;
}

/* Hamburger to X animation */
.mobile-menu-toggle.active .hamburger span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.mobile-menu-toggle.active .hamburger span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.mobile-menu-toggle.active .hamburger span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- Mobile Menu Overlay ---------- */
.mobile-nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: var(--z-overlay);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-normal);
}

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

/* ---------- Mobile Menu Drawer ---------- */
.mobile-nav {
  position: fixed;
  top: 0;
  right: 0;
  width: min(360px, 85vw);
  height: 100vh;
  height: 100dvh;
  background-color: var(--color-surface);
  z-index: var(--z-modal);
  transform: translateX(100%);
  transition: transform var(--duration-slow) var(--ease-out);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.mobile-nav.active {
  transform: translateX(0);
}

.mobile-nav-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--color-divider);
}

.mobile-nav-close {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background-color: var(--color-surface-2);
  cursor: pointer;
  border: none;
  color: var(--color-text);
}

.mobile-nav-body {
  padding: var(--space-4) var(--space-6);
  flex: 1;
  overflow-y: auto;
  min-height: 0;
  -webkit-overflow-scrolling: touch;
}

.mobile-nav-body a {
  display: block;
  padding: var(--space-4) 0;
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  color: var(--color-text);
  border-bottom: 1px solid var(--color-divider);
  transition: var(--transition-fast);
}

.mobile-nav-body a:hover {
  color: var(--color-primary);
  padding-left: var(--space-2);
}

.mobile-nav-body a:last-child {
  border-bottom: none;
}

.mobile-nav-footer {
  padding: var(--space-5) var(--space-6);
  border-top: 1px solid var(--color-divider);
  flex-shrink: 0;
}

.mobile-nav-footer .btn {
  width: 100%;
  justify-content: center;
}

.mobile-nav-contact {
  margin-top: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.mobile-nav-contact a {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.mobile-nav-contact svg {
  width: 16px;
  height: 16px;
  color: var(--color-primary);
}

/* Body lock when menu is open */
body.menu-open {
  overflow: hidden;
}