/* ===== HEADER ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.header--scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.header__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-8);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: var(--text-xl);
  font-weight: var(--weight-bold);
  color: var(--color-primary);
  letter-spacing: var(--tracking-tight);
  text-decoration: none;
  min-height: 44px;
}

.logo__mark {
  width: 36px;
  height: 36px;
  background: var(--gradient-accent);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  flex-shrink: 0;
}

.logo__mark svg {
  display: block;
}

/* Navigation */
.nav {
  display: flex;
  align-items: center;
  gap: var(--space-10);
}

.nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav__link {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
  position: relative;
  padding: 4px 0;
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-primary);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  border-radius: 1px;
  transition: width var(--transition-base);
}

.nav__link:hover::after,
.nav__link--active::after {
  width: 100%;
}

.nav__cta {
  padding: 10px 24px;
  font-size: var(--text-sm);
  min-height: 44px;
}

/* ===== BURGER ===== */
.burger {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

.burger:hover {
  background: var(--color-bg-alt);
}

.burger__inner {
  width: 22px;
  height: 14px;
  position: relative;
}

.burger__line {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: all 0.3s var(--ease-out);
}

.burger__line:nth-child(1) { top: 0; }
.burger__line:nth-child(2) { top: 6px; }
.burger__line:nth-child(3) { top: 12px; }

.burger--active .burger__line:nth-child(1) {
  top: 6px;
  transform: rotate(45deg);
}

.burger--active .burger__line:nth-child(2) {
  opacity: 0;
  transform: translateX(-8px);
}

.burger--active .burger__line:nth-child(3) {
  top: 6px;
  transform: rotate(-45deg);
}

/* ===== MOBILE NAV ===== */
.mobile-nav {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-white);
  z-index: var(--z-mobile-nav);
  padding: var(--space-6) var(--space-8);
  display: flex;
  flex-direction: column;
  gap: 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all 0.3s var(--ease-out);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.mobile-nav--open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.mobile-nav__link {
  display: flex;
  align-items: center;
  padding: var(--space-5) 0;
  font-size: var(--text-lg);
  font-weight: var(--weight-medium);
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border-light);
  transition: color var(--transition-fast);
  min-height: 56px;
  -webkit-tap-highlight-color: transparent;
}

.mobile-nav__link:last-of-type {
  border-bottom: none;
}

.mobile-nav__link:active {
  color: var(--color-accent);
}

.mobile-nav__cta {
  margin-top: auto;
  padding: var(--space-6) 0;
}

.mobile-nav__cta .btn {
  width: 100%;
  min-height: 52px;
  font-size: var(--text-base);
}