.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  width: 100%;
  height: var(--header-height);
  background-color: #0c0042;
}

.site-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  padding: 0 var(--gutter);
  /* wider by 2×gutter so the padded content edge lands at the same
     horizontal position as the repertoire's margin:auto inner block */
  max-width: calc(var(--max-width) + 2 * var(--gutter));
  margin: 0 auto;
}

.site-header__logo {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 400;
  color: #ffffff;
  letter-spacing: 0.03em;
  white-space: nowrap;
}

.site-header__logo:hover {
  color: var(--color-accent);
}

/* Desktop nav */

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.site-nav__item {
  position: relative;
}

.site-nav__link,
.site-nav__folder-btn {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 400;
  color: #ffffff;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  transition: color var(--transition);
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 0.3em;
  white-space: nowrap;
}

.site-nav__link:hover,
.site-nav__folder-btn:hover {
  color: var(--color-accent);
}

.site-nav__link[aria-current="page"] {
  border-bottom: 1px solid rgba(255, 255, 255, 0.5);
}

/* Dropdown */

.site-nav__dropdown {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background: #0c0042;
  min-width: 180px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
  padding: 0.5rem 0;
  z-index: 10;
}

.site-nav__item:hover .site-nav__dropdown,
.site-nav__item.is-open .site-nav__dropdown {
  display: block;
}

.site-nav__dropdown-link {
  display: block;
  padding: 0.5rem 1.25rem;
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.85);
  white-space: nowrap;
  transition: color var(--transition), background var(--transition);
}

.site-nav__dropdown-link:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.08);
}

/* Hamburger */

.site-header__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  padding: 2px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 200;
}

.site-header__hamburger span {
  display: block;
  height: 2px;
  width: 100%;
  background-color: #ffffff;
  transition: transform var(--transition), opacity var(--transition);
}

.site-header__hamburger.is-active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.site-header__hamburger.is-active span:nth-child(2) {
  opacity: 0;
}

.site-header__hamburger.is-active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile overlay */

.mobile-nav {
  display: none;
  position: fixed;
  inset: 0;
  top: var(--header-height);
  background: #0c0042;
  z-index: 99;
  padding: 2rem var(--gutter);
  overflow-y: auto;
  flex-direction: column;
  gap: 0;
}

.mobile-nav.is-open {
  display: flex;
}

.mobile-nav__item {
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.mobile-nav__link,
.mobile-nav__folder-btn {
  display: block;
  width: 100%;
  text-align: left;
  padding: 0.9rem 0;
  font-size: 1.25rem;
  color: #ffffff;
  font-family: var(--font-heading);
  background: none;
  border: none;
  cursor: pointer;
}

.mobile-nav__sub {
  display: none;
  padding-left: 1rem;
}

.mobile-nav__item.is-open .mobile-nav__sub {
  display: block;
}

.mobile-nav__sub-link {
  display: block;
  padding: 0.6rem 0;
  font-size: 1.0rem;
  color: rgba(255, 255, 255, 0.7);
}

@media (max-width: 940px) {
  .site-nav {
    display: none;
  }

  .site-header__hamburger {
    display: flex;
  }
}