.nav {
  display: flex;
  gap: var(--space-8);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav a {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  transition: color .2s;
}

.nav a:hover {
  color: var(--color-brand);
}

.header-icons {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.header-login,
.header-logout {
  color: #fff;
  font-weight: 700;
  text-decoration: none;
  margin: 0 var(--space-8);
  padding: var(--space-2) var(--space-6);
  border-radius: var(--radius-sm);
  display: inline-block;
  transition: opacity .2s, box-shadow .2s;
}

.header-login {
  background: var(--color-brand);
}

.header-login:hover {
  opacity: .9;
  box-shadow: 0 4px 12px var(--color-brand-dim-hover);
}

.header-logout {
  background: var(--gray-600);
}

.header-logout:hover {
  opacity: .9;
  box-shadow: 0 4px 12px rgba(102, 102, 102, .3);
}

.header-login-mobile {
  display: none;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--color-brand);
  color: #fff;
  border-radius: var(--radius-sm);
  text-decoration: none;
  flex-shrink: 0;
  transition: opacity .2s, box-shadow .2s;
}

.header-login-mobile:hover {
  opacity: .9;
  box-shadow: 0 4px 12px var(--color-brand-dim-hover);
}

.dropdown {
  position: relative;
  display: inline-block;
}

.dropbtn {
  cursor: pointer;
}

.dropdown-content {
  display: none;
  position: absolute;
  background: var(--color-surface);
  min-width: 220px;
  box-shadow: 0 8px 16px var(--color-overlay-light);
  z-index: 100;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  overflow: hidden;
}

.dropdown-content a {
  color: var(--color-text);
  padding: 12px 16px;
  text-decoration: none;
  display: block;
  transition: background .2s, color .2s;
}

.dropdown-content a:hover {
  background: var(--gray-100);
  color: var(--color-brand);
}

.dropdown:hover .dropdown-content {
  display: block;
}

.dropdown-content .dropdown {
  position: relative;
}

.dropdown-content .dropdown>.dropbtn:after {
  content: ' ▶';
  font-size: .8em;
}

.dropdown-content .dropdown-content {
  display: none;
  position: absolute;
  top: 0;
  left: 100%;
  min-width: 200px;
  background: var(--color-surface);
  box-shadow: 0 8px 16px var(--color-overlay-light);
  border-radius: 0 var(--radius-md) var(--radius-md) var(--radius-md);
  z-index: 200;
}

.dropdown-content .dropdown:hover>.dropdown-content,
.dropdown-content .dropdown:focus-within>.dropdown-content {
  display: block;
}

.dropdown-content .dropdown>.dropbtn {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 12px 16px;
  color: var(--color-text);
  font: inherit;
  cursor: pointer;
}

.dropdown-content .dropdown>.dropbtn:hover {
  background: var(--gray-100);
  color: var(--color-brand);
}

.header-icons .theme-toggle {
  margin-left: .5rem;
}

/* Burger button — hidden on desktop, shown via responsive.css at <=800px */
.burger-btn {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 32px;
  height: 22px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
}

.burger-line {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.burger-btn[aria-expanded="true"] .burger-line:nth-child(1) {
  transform: translateY(10px) rotate(45deg);
}

.burger-btn[aria-expanded="true"] .burger-line:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.burger-btn[aria-expanded="true"] .burger-line:nth-child(3) {
  transform: translateY(-10px) rotate(-45deg);
}

/* Mobile menu panel — hidden on desktop, shown via responsive.css */
.mobile-menu {
  display: none;
  position: fixed;
  top: var(--header-height-mobile);
  left: 0;
  right: 0;
  bottom: var(--footer-height);
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
  z-index: 9;
  transform: translateY(-8px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.mobile-menu.is-open {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.mobile-menu__scroll {
  height: 100%;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: var(--space-4) var(--space-6);
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.mobile-nav {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.mobile-nav > li {
  border-bottom: 1px solid var(--color-border);
}

.mobile-nav > li:last-child {
  border-bottom: none;
}

.mobile-nav > li > a {
  display: block;
  padding: var(--space-4) 0;
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
}

.mobile-nav > li > a:hover {
  color: var(--color-brand);
}

.mobile-dropbtn-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-4) 0;
  cursor: pointer;
  transition: background 0.2s;
}

.mobile-dropbtn-wrapper:hover {
  background: var(--color-overlay-light);
}

.mobile-dropbtn-link {
  padding: 0;
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

.mobile-dropbtn-link:hover {
  color: var(--color-brand);
}

.mobile-dropbtn-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  flex-shrink: 0;
  margin-left: var(--space-4);
}

.mobile-arrow {
  font-size: 1.2em;
  transition: transform 0.2s ease;
  color: var(--color-text);
}

.mobile-dropdown.is-open .mobile-arrow {
  transform: rotate(180deg);
}

.mobile-dropdown-content {
  display: none;
  list-style: none;
  margin: 0;
  padding: 0 0 var(--space-3) var(--space-4);
}

.mobile-dropdown.is-open .mobile-dropdown-content {
  display: block;
}

.mobile-dropdown-content a {
  display: block;
  padding: var(--space-3) 0;
  color: var(--color-text);
  text-decoration: none;
  font-size: var(--text-sm);
}

.mobile-dropdown-content a:hover {
  color: var(--color-brand);
}

.mobile-menu__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
  margin-top: auto;
}