/* ==========================================================================
   Header
   ========================================================================== */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: box-shadow var(--t-base) var(--ease),
              border-color var(--t-base) var(--ease);
  border-bottom: 1px solid transparent;
}

.site-header.scrolled {
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
  border-bottom-color: var(--c-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-w-wide);
  margin: 0 auto;
  padding: 0 var(--sp-5);
}

@media (min-width: 768px) {
  .site-header__inner { padding: 0 var(--sp-8); }
}

/* ── Logo ──────────────────────────────────────────────────────────────── */
.site-header__logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
}

.site-header__logo img {
  height: 36px;
  width: auto;
}

@media (min-width: 768px) {
  .site-header__logo img { height: 40px; }
}

/* ── Desktop Nav ───────────────────────────────────────────────────────── */
.site-header__nav {
  display: none;
}

@media (min-width: 1024px) {
  .site-header__nav {
    display: flex;
    align-items: center;
    gap: var(--sp-1);
  }
}

.site-header__nav-link {
  padding: var(--sp-2) var(--sp-3);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--c-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: color var(--t-fast) var(--ease),
              background var(--t-fast) var(--ease);
  white-space: nowrap;
}

.site-header__nav-link:hover,
.site-header__nav-link[aria-current="page"] {
  color: var(--c-primary-600);
  background: var(--c-primary-50);
}

/* ── Dropdown ──────────────────────────────────────────────────────────── */
.site-header__dropdown {
  position: relative;
}

.site-header__dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  min-width: 220px;
  padding: var(--sp-2);
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  z-index: var(--z-dropdown);
}

.site-header__dropdown:hover .site-header__dropdown-menu,
.site-header__dropdown:focus-within .site-header__dropdown-menu {
  display: block;
}

.site-header__dropdown-item {
  display: block;
  padding: var(--sp-2) var(--sp-4);
  font-size: var(--fs-sm);
  color: var(--c-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: all var(--t-fast) var(--ease);
}

.site-header__dropdown-item:hover {
  background: var(--c-primary-50);
  color: var(--c-primary-600);
}

/* ── Header Actions ────────────────────────────────────────────────────── */
.site-header__actions {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

.site-header__cta {
  display: none;
}

@media (min-width: 1024px) {
  .site-header__cta {
    display: inline-flex;
  }
}

/* ── Mobile Toggle ─────────────────────────────────────────────────────── */
.site-header__toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--sp-2);
  gap: 5px;
}

.site-header__toggle-bar {
  width: 22px;
  height: 2px;
  background: var(--c-text);
  border-radius: 2px;
  transition: all var(--t-base) var(--ease);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.site-header__toggle[aria-expanded="true"] .site-header__toggle-bar:nth-child(2) {
  opacity: 0;
}
.site-header__toggle[aria-expanded="true"] .site-header__toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (min-width: 1024px) {
  .site-header__toggle { display: none; }
}

/* ── Mobile Nav ────────────────────────────────────────────────────────── */
.site-header__mobile-nav {
  position: fixed;
  top: 0;
  right: 0;
  width: min(320px, 85vw);
  height: 100vh;
  height: 100dvh;
  background: var(--c-bg);
  z-index: var(--z-overlay);
  transform: translateX(100%);
  transition: transform var(--t-base) var(--ease);
  overflow-y: auto;
  padding: var(--sp-6);
  box-shadow: -4px 0 20px rgba(0,0,0,0.1);
}

.site-header__mobile-nav[aria-hidden="false"] {
  transform: translateX(0);
}

.site-header__mobile-nav-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--sp-8);
  padding-bottom: var(--sp-4);
  border-bottom: 1px solid var(--c-border);
}

.site-header__mobile-nav-close {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--c-text);
  font-size: var(--fs-xl);
  border-radius: var(--radius-sm);
}

.site-header__mobile-nav-close:hover {
  background: var(--c-bg-alt);
}

.site-header__mobile-nav-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.site-header__mobile-nav-link {
  display: block;
  padding: var(--sp-3) var(--sp-4);
  font-size: var(--fs-base);
  font-weight: var(--fw-medium);
  color: var(--c-text);
  text-decoration: none;
  border-radius: var(--radius-sm);
  margin-bottom: var(--sp-1);
}

.site-header__mobile-nav-link:hover,
.site-header__mobile-nav-link[aria-current="page"] {
  background: var(--c-primary-50);
  color: var(--c-primary-600);
}

.site-header__mobile-nav-cta {
  margin-top: var(--sp-6);
  padding-top: var(--sp-6);
  border-top: 1px solid var(--c-border);
}

/* ── Overlay ───────────────────────────────────────────────────────────── */
.site-header__overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: calc(var(--z-overlay) - 1);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--t-base) var(--ease);
}

.site-header__overlay.active {
  opacity: 1;
  pointer-events: auto;
}