.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background 0.3s ease, border-color 0.3s ease;
}

.header--scrolled {
  background: var(--color-bg);
  border-bottom-color: var(--color-border-light);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

/* Logo & links: white by default (over video), dark when scrolled */
.header__logo {
  font-weight: 700;
  font-size: 1.125rem;
  color: #fff;
  letter-spacing: -0.02em;
  text-decoration: none;
  transition: color 0.3s ease;
  animation: logo-float 3s ease-in-out infinite;
  display: inline-block;
}

@keyframes logo-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

.header--scrolled .header__logo {
  color: var(--color-text);
}

.header__nav {
  display: flex;
  align-items: center;
}

.header__links {
  display: flex;
  gap: 2rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.header__links li a {
  font-size: 0.875rem;
  font-weight: 450;
  color: rgba(255, 255, 255, 0.75);
  text-decoration: none;
  transition: color 0.3s ease;
}

.header__links li a:hover {
  color: #fff;
}

.header--scrolled .header__links li a {
  color: var(--color-text-secondary);
}

.header--scrolled .header__links li a:hover {
  color: var(--color-text);
}

/* CTA button in header */
.header__cta {
  font-size: 0.8125rem;
  padding: 0.5rem 1rem;
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.4);
  transition: background 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

.header__cta:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.7);
  opacity: 1;
}

.header--scrolled .header__cta {
  background: var(--color-primary);
  color: #fff;
  border-color: transparent;
}

.header--scrolled .header__cta:hover {
  opacity: 0.85;
}

/* Hamburger */
.header__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 20px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.header__hamburger span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: #fff;
  transition: transform 0.2s ease, background 0.3s ease;
}

.header--scrolled .header__hamburger span {
  background: var(--color-text);
}

.header__hamburger.active span:first-child {
  transform: rotate(45deg) translateY(3.25px);
}

.header__hamburger.active span:last-child {
  transform: rotate(-45deg) translateY(-3.25px);
}

/* Mobile menu - fullscreen overlay */
.header__mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-bg);
  z-index: 99;
  padding: 80px var(--space-6) var(--space-8);
  flex-direction: column;
  justify-content: flex-start;
}

.header__mobile-menu.active {
  display: flex;
}

.header__mobile-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  list-style: none;
  margin: 0;
  padding: 0;
}

.header__mobile-links a {
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
}

.header__mobile-links a.btn-primary {
  color: #fff;
}

@media (max-width: 809px) {
  .header__nav,
  .header__cta {
    display: none;
  }

  .header__hamburger {
    display: flex;
  }
}

@media (min-width: 810px) {
  .header__hamburger {
    display: none;
  }

  .header__mobile-menu {
    display: none !important;
  }
}