/* ══════════════════════════════════════════
   Site navigation bar
   ══════════════════════════════════════════ */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 100;
  transition:
    background-color var(--transition-normal),
    box-shadow var(--transition-normal);
}

/* Transparent state — over hero */
.site-nav--transparent {
  background-color: transparent;
}

.site-nav--transparent .site-nav__link,
.site-nav--transparent .site-nav__logo {
  color: var(--color-text-on-dark);
}

/* Scrolled state — white background */
.site-nav--scrolled {
  background-color: var(--color-text-on-dark);
  box-shadow: var(--shadow-nav);
}

.site-nav--scrolled .site-nav__link,
.site-nav--scrolled .site-nav__logo {
  color: var(--color-text-heading);
}

.site-nav--scrolled .site-nav__link:hover {
  color: var(--color-accent);
}

/* Inner layout */
.site-nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  height: 100%;
  margin-inline: auto;
  padding-inline: var(--space-lg);
}

/* Logo */
.site-nav__logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  text-decoration: none;
  color: inherit;
}

.site-nav__logo svg {
  display: block;
  height: 28px;
  width: auto;
}

/* Desktop nav links */
.site-nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav__link {
  font-family: var(--font-heading);
  font-size: var(--text-small);
  font-weight: var(--weight-medium);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.site-nav__link:hover {
  text-decoration: none;
}

.site-nav__link:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: 2px;
}

/* Dropdown wrapper — "Work" item */
.site-nav__dropdown-wrapper {
  position: relative;
}

/* Dropdown panel */
.site-nav__dropdown {
  position: absolute;
  top: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%) translateY(-4px);
  min-width: 200px;
  background-color: var(--color-text-on-dark);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-dropdown);
  padding: var(--space-sm) 0;
  list-style: none;
  margin: 0;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition:
    opacity var(--transition-fast),
    visibility var(--transition-fast),
    transform var(--transition-fast);
}

/* Invisible bridge fills the gap between trigger and panel */
.site-nav__dropdown::before {
  content: "";
  position: absolute;
  bottom: 100%;
  left: 0;
  right: 0;
  height: 16px;
}

.site-nav__dropdown-wrapper:hover .site-nav__dropdown,
.site-nav__dropdown-wrapper:focus-within .site-nav__dropdown {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.site-nav__dropdown a {
  display: block;
  padding: 0.5rem var(--space-lg);
  font-family: var(--font-heading);
  font-size: var(--text-small);
  color: var(--color-text-heading);
  text-decoration: none;
  transition: background-color var(--transition-fast);
}

.site-nav__dropdown a:hover {
  background-color: var(--color-bg-warm-grey);
  color: var(--color-accent);
  text-decoration: none;
}

.site-nav__dropdown a:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: -2px;
}

/* ══════════════════════════════════════════
   Hamburger button
   ══════════════════════════════════════════ */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  background: none;
  border: none;
  cursor: pointer;
  border-radius: var(--radius-sm);
}

.hamburger__line {
  display: block;
  width: 24px;
  height: 2px;
  background-color: currentColor;
  border-radius: 1px;
}

.hamburger:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* ══════════════════════════════════════════
   Mobile drawer overlay
   ══════════════════════════════════════════ */
.mobile-drawer__overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-slow), visibility var(--transition-slow);
  z-index: 200;
}

.mobile-drawer__overlay.is-open {
  opacity: 1;
  visibility: visible;
}

/* ══════════════════════════════════════════
   Mobile drawer panel
   ══════════════════════════════════════════ */
.mobile-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(320px, 85vw);
  background-color: var(--color-bg-dark);
  color: var(--color-text-on-dark);
  z-index: 201;
  transform: translateX(100%);
  transition: transform var(--transition-slow);
  overflow-y: auto;
  padding: var(--space-xl);
  padding-top: calc(var(--nav-height) + var(--space-lg));
}

.mobile-drawer.is-open {
  transform: translateX(0);
}

.mobile-drawer__close {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-on-dark);
  font-size: 1.5rem;
  line-height: 1;
  border-radius: var(--radius-sm);
}

.mobile-drawer__close:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.mobile-drawer__close:focus-visible {
  outline: 2px solid var(--color-text-on-dark);
  outline-offset: 2px;
}

.mobile-drawer a {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-h3);
  font-weight: var(--weight-medium);
  color: var(--color-text-on-dark);
  text-decoration: none;
  padding-block: var(--space-sm);
}

.mobile-drawer a:hover {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
}

.mobile-drawer__sub {
  list-style: none;
  padding: 0;
  padding-left: var(--space-lg);
  margin-bottom: var(--space-sm);
}

.mobile-drawer__sub a {
  font-size: var(--text-body);
  font-weight: var(--weight-regular);
  color: rgba(255, 255, 255, 0.7);
  padding-block: var(--space-xs);
}

.mobile-drawer__sub a:hover {
  color: var(--color-text-on-dark);
}

/* ══════════════════════════════════════════
   Responsive — 768px breakpoint
   ══════════════════════════════════════════ */
@media (max-width: 768px) {
  .site-nav__links {
    display: none;
  }

  .hamburger {
    display: flex;
  }
}