/* Header – FlowSync SaaS */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: var(--z-header);
  background-color: rgba(255,255,255,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.header.is-scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: 0 2px 16px rgba(99,102,241,0.08);
}

.header__inner {
  display: flex;
  align-items: center;
  height: 100%;
  gap: var(--space-8);
}

/* Logo */
.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  flex-shrink: 0;
}

.logo-icon { flex-shrink: 0; }

/* Nav */
.header__nav { flex: 1; }

.nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav__link {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
  padding: var(--space-1) 0;
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-primary);
  border-radius: 2px;
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.nav__link:hover { color: var(--color-primary); }
.nav__link:hover::after { transform: scaleX(1); }
.nav__link.is-active { color: var(--color-primary); }
.nav__link.is-active::after { transform: scaleX(1); }

/* Actions */
.header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-left: auto;
}

/* Mobile Menu Button */
.mobile-menu-btn {
  display: none;
  padding: var(--space-2);
  color: var(--color-text);
}

.hamburger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  width: 22px;
}

.hamburger span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background-color: currentColor;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.mobile-menu-btn[aria-expanded="true"] .hamburger span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.mobile-menu-btn[aria-expanded="true"] .hamburger span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.mobile-menu-btn[aria-expanded="true"] .hamburger span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile Menu */
.mobile-menu {
  background-color: #fff;
  padding: 0 var(--container-padding) 0;
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow), padding var(--transition-slow);
  border-bottom: 1px solid var(--color-border);
}

.mobile-menu[aria-hidden="false"] {
  max-height: 500px;
  padding-bottom: var(--space-6);
}

.mobile-menu__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding-top: var(--space-4);
  margin-bottom: var(--space-4);
}

.mobile-menu__link {
  display: block;
  padding: var(--space-3) 0;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
  transition: color var(--transition-fast);
}

.mobile-menu__link:hover { color: var(--color-primary); }
.mobile-menu__cta { width: 100%; }

@media (max-width: 900px) {
  .header__nav { display: none; }
  .header__actions .btn:not(.mobile-menu-btn) { display: none; }
  .mobile-menu-btn { display: flex; }
}