/* hamburger.css */

.nav-header {
  position: fixed;
  top: 0;
  right: 0;
  z-index: var(--z-nav);
  padding: var(--sp-6) var(--sp-8);
}

/* Hamburger Button */
.hamburger {
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 0.5rem;
  transition: all var(--duration-base) ease;
  width: 32px;
  height: 32px;
  align-items: center;
  justify-content: center;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--text);
  border-radius: 2px;
  transition: all var(--duration-base) ease;
  transform-origin: center;
}

.hamburger.active span:nth-child(1) {
  transform: translateY(10px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: translateY(-10px) rotate(-45deg);
}

/* Menu Overlay */
.menu-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(6, 11, 16, 0.95);
  backdrop-filter: blur(4px);
  z-index: var(--z-menu);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--duration-base) ease, visibility var(--duration-base) ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.menu-overlay.active {
  opacity: 1;
  visibility: visible;
}

/* Menu Items */
.menu-items {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-12);
  width: 90%;
  max-width: 600px;
  padding: var(--sp-8);
}

.menu-logo {
  font-family: var(--font-head);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  margin-bottom: var(--sp-4);
}

.menu-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--sp-6);
  text-align: center;
}

.menu-links a {
  color: var(--text);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 1.2rem;
  padding: var(--sp-3) var(--sp-4);
  border-radius: 4px;
  transition: all var(--duration-base) ease;
}

.menu-links a:hover {
  color: var(--accent);
}

.menu-links a[aria-current="page"] {
  color: var(--accent);
  font-weight: 700;
}

/* Menu Footer */
.menu-footer {
  display: flex;
  justify-content: center;
  margin-top: var(--sp-8);
}

/* Theme Switch Button */
.theme-switch {
  background: var(--surface);
  border: 1px solid var(--border);
  cursor: pointer;
  width: 50px;
  height: 26px;
  border-radius: 20px;
  padding: 2px;
  position: relative;
  transition: all var(--duration-base) ease;
  display: flex;
  align-items: center;
  justify-content: flex-start;
}

.theme-switch:hover {
  border-color: var(--accent);
}

.theme-switch-dot {
  width: 20px;
  height: 20px;
  background-color: var(--text);
  border-radius: 50%;
  display: block;
  transition: transform var(--duration-base) ease;
}

.theme-switch.light {
  justify-content: flex-end;
}

.theme-switch.light .theme-switch-dot {
  transform: translateX(24px);
}

/* Keyboard Focus */
.hamburger:focus-visible,
.menu-links a:focus-visible,
.theme-switch:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Skip Link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--accent);
  color: var(--bg);
  padding: var(--sp-2) var(--sp-4);
  z-index: var(--z-modal);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

.skip-link:focus {
  top: 0;
}
