/* ============================================================
   AUTODEB — Header & Navigation
   ============================================================ */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  height: var(--header-height);
  background: var(--nav-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: all var(--ease-base);
}
.site-header.scrolled {
  border-bottom-color: var(--border);
  box-shadow: var(--shadow-md);
}
.site-header.transparent {
  background: transparent;
  border-bottom-color: transparent;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--sp-6);
  gap: var(--sp-8);
}

/* ── Logo ── */
.site-logo {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  text-decoration: none;
  flex-shrink: 0;
}
.logo-mark {
  width: 38px;
  height: 38px;
  position: relative;
}
.logo-wordmark {
  font-size: var(--text-xl);
  font-weight: var(--weight-extrabold);
  letter-spacing: -0.02em;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── Main Nav ── */
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  flex: 1;
  justify-content: center;
}
.nav-link {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--text-secondary);
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--ease-fast);
  white-space: nowrap;
  position: relative;
}
.nav-link:hover {
  color: var(--text-primary);
  background: rgba(124,58,237,0.08);
}
.nav-link.active {
  color: var(--color-primary);
  background: rgba(124,58,237,0.1);
}
.nav-link.api-link {
  color: var(--color-secondary);
}
.nav-link.api-link:hover {
  background: rgba(6,182,212,0.1);
}

/* ── Header Actions ── */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  flex-shrink: 0;
}

/* ── Language Toggle ── */
.lang-toggle {
  display: flex;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  padding: 3px;
  gap: 2px;
}
.lang-btn {
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  color: var(--text-tertiary);
  padding: 4px 10px;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--ease-fast);
  background: none;
  border: none;
  line-height: 1;
}
.lang-btn.active {
  background: var(--color-primary);
  color: #fff;
}
.lang-btn:hover:not(.active) {
  color: var(--text-primary);
}

/* ── Theme Toggle ── */
.theme-toggle {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  background: var(--bg-card);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--ease-fast);
  color: var(--text-secondary);
}
.theme-toggle:hover {
  background: var(--bg-card-hover);
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle .icon-sun  { display: none; }
.theme-toggle .icon-moon { display: block; }
[data-theme="light"] .theme-toggle .icon-sun  { display: block; }
[data-theme="light"] .theme-toggle .icon-moon { display: none; }

/* ── Mobile Menu Button ── */
.mobile-menu-btn {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--border);
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
  padding: 10px;
  transition: all var(--ease-fast);
}
.mobile-menu-btn:hover { border-color: var(--color-primary); }
.hamburger-line {
  width: 100%;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--ease-base);
  display: block;
}
.mobile-menu-btn.open .hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.mobile-menu-btn.open .hamburger-line:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.mobile-menu-btn.open .hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ── Mobile Menu Drawer ── */
.mobile-menu {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: var(--sp-4) var(--sp-4) var(--sp-6);
  transform: translateY(-10px);
  opacity: 0;
  pointer-events: none;
  transition: all var(--ease-base);
  z-index: calc(var(--z-sticky) - 1);
  box-shadow: var(--shadow-lg);
}
.mobile-menu.open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: all;
}
.mobile-nav {
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
  margin-bottom: var(--sp-4);
}
.mobile-nav-link {
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  color: var(--text-secondary);
  padding: var(--sp-3) var(--sp-3);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: all var(--ease-fast);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.mobile-nav-link:hover {
  color: var(--text-primary);
  background: rgba(124,58,237,0.08);
}
.mobile-nav-link.active {
  color: var(--color-primary);
  background: rgba(124,58,237,0.1);
}
.mobile-menu-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--sp-4);
  border-top: 1px solid var(--border);
}
.mobile-cta {
  flex: 1;
}

/* ── Page Content Offset ── */
.page-content {
  padding-top: var(--header-height);
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .main-nav { display: none; }
  .mobile-menu-btn { display: flex; }
  .header-actions .btn-primary { display: none; }
}
@media (max-width: 480px) {
  .header-inner { padding-inline: var(--sp-4); }
}