/* ============================================================
   COMPONENTS.CSS — Header, footer, nav, shared components
   davidbunton.design
   ============================================================ */


/* ------------------------------------------------------------
   HEADER
   ------------------------------------------------------------ */

#site-header {
  position: sticky;
  top: 0;
  z-index: 300;
  height: 44px;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition:
    height var(--transition-base),
    background var(--transition-base),
    border-color var(--transition-base);
}

/* Scrolled state — animates in once top header leaves view */
#site-header.is-scrolled {
  height: var(--header-height);
  background: rgba(28, 28, 31, 0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}


/* ------------------------------------------------------------
   NAV LEFT
   ------------------------------------------------------------ */

.nav-left {
  display: flex;
  align-items: stretch;
  align-self: stretch;
  gap: var(--space-lg);
}

.nav-item {
  position: relative;
  display: flex;
  align-items: center;
}

.nav-link {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
  padding: 3px 0;
  display: inline-block;
}

.nav-link:focus-visible,
.nav-cv-link:focus-visible,
.nav-btn-contact:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: 3px;
}

/* Hover only — focus ring is the sole indicator when keyboard navigating */
.nav-link:hover,
.nav-btn-contact:hover,
.nav-cv-link:hover {
  color: var(--color-text-headline);
}

/* Non-scrolled hover: text underline */
.nav-link:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* Scrolled hover: remove text underline, use bottom border line instead */
#site-header.is-scrolled .nav-link:hover {
  text-decoration: none;
}

.nav-item:has(.nav-link:hover)::after,
.nav-item:has(.nav-btn-contact:hover)::after,
.nav-item:has(.nav-cv-link:hover)::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-text-headline);
  opacity: 0;
}

#site-header.is-scrolled .nav-item:has(.nav-link:hover)::after,
#site-header.is-scrolled .nav-item:has(.nav-btn-contact:hover)::after,
#site-header.is-scrolled .nav-item:has(.nav-cv-link:hover)::after {
  opacity: 1;
}

.nav-link.is-active {
  color: var(--color-text-headline);
  font-weight: 600;
}

.nav-item:has(.nav-link.is-active)::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-text-headline);
  opacity: 0;
}

#site-header.is-scrolled .nav-item:has(.nav-link.is-active)::after {
  opacity: 1;
}


/* ------------------------------------------------------------
   PROJECTS FLYOUT
   ------------------------------------------------------------ */

.nav-flyout {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  transform: translateY(-6px);
  background: var(--color-overlay);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: var(--space-sm);
  box-shadow: var(--shadow-overlay);
  min-width: 300px;
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  transition:
    opacity var(--transition-base),
    transform var(--transition-base),
    visibility var(--transition-base);
  z-index: 200;
}

.nav-flyout.is-visible {
  visibility: visible;
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.flyout-item {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: var(--space-md);
  border-radius: 8px;
  border: 0.5px solid transparent;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.flyout-item:hover,
.flyout-item:focus {
  background: var(--color-surface-raised);
  border-color: var(--color-btn-border);
  outline: none;
}

.flyout-item-title {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-headline);
}

.flyout-item-desc {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}


/* ------------------------------------------------------------
   NAV RIGHT
   ------------------------------------------------------------ */

.nav-right {
  display: flex;
  align-items: stretch;
  align-self: stretch;
  gap: var(--space-lg);
}


/* Get in touch button */
.nav-btn-contact {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
  padding: 3px 0;
}

.nav-btn-contact:hover {
  color: var(--color-text-headline);
  text-decoration: underline;
  text-underline-offset: 3px;
}

#site-header.is-scrolled .nav-btn-contact:hover {
  text-decoration: none;
}


/* Contact popover */
.nav-popover-wrapper {
  position: relative;
}

.nav-popover {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  /* Note: #site-header.is-scrolled .nav-popover below adjusts for taller header */
  background: var(--color-overlay);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: var(--space-sm);
  box-shadow: var(--shadow-overlay);
  min-width: 240px;
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-6px);
  transition:
    opacity var(--transition-base),
    transform var(--transition-base),
    visibility var(--transition-base);
  z-index: 200;
}

.nav-popover.is-visible {
  visibility: visible;
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.popover-link {
  display: block;
  padding: var(--space-md);
  border-radius: 8px;
  font-size: var(--text-sm);
  color: var(--color-text-body);
  border: 0.5px solid transparent;
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.popover-link--external {
  display: flex;
  align-items: center;
  gap: 4px;
}

.external-link-icon {
  flex-shrink: 0;
}

.popover-link:hover,
.popover-link:focus {
  background: var(--color-surface-raised);
  color: var(--color-text-headline);
  border-color: var(--color-btn-border);
  outline: none;
}


/* CV download */
.nav-cv-link {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
  display: inline-flex;
  align-items: baseline;
  gap: 3px;
  border-bottom: 1px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.nav-cv-link:hover {
  color: var(--color-text-headline);
  border-bottom-color: currentColor;
}

#site-header.is-scrolled .nav-cv-link:hover {
  border-bottom-color: transparent;
}

.nav-cv-icon {
  font-size: var(--text-xs);
}


/* ------------------------------------------------------------
   MOBILE NAV — Hamburger + overlay
   ------------------------------------------------------------ */

.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 4px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 300;
}

.nav-hamburger:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: 3px;
}

.hamburger-bar {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--color-text-muted);
  border-radius: 2px;
  transform-origin: center;
  transition:
    transform 0.3s ease,
    opacity 0.3s ease,
    width 0.3s ease;
}

/* Morph to ✕ when open */
.nav-hamburger.is-open .hamburger-bar:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}
.nav-hamburger.is-open .hamburger-bar:nth-child(2) {
  opacity: 0;
  width: 0;
}
.nav-hamburger.is-open .hamburger-bar:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* Full-screen overlay */
.mobile-nav {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: var(--color-bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transform: translateY(-100%);
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: none;
}

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

@media (prefers-reduced-motion: reduce) {
  .mobile-nav {
    transition: none;
  }
  .hamburger-bar {
    transition: none;
  }
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
  list-style: none;
  padding: 0;
  margin: 0;
}

.mobile-nav-link {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 600;
  color: var(--color-text-headline);
  text-align: center;
  transition: color var(--transition-fast);
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.mobile-nav-link:hover {
  color: var(--color-text-muted);
}

.mobile-nav-link:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 4px;
  border-radius: 3px;
}

/* Show hamburger, hide desktop nav at mobile breakpoint */
@media (max-width: 768px) {
  .nav-hamburger {
    display: flex;
  }
  .nav-left,
  .nav-right {
    display: none;
  }
  .site-nav {
    padding: 0 var(--space-md);
  }
  .nav-hamburger {
    margin-top: 6px;
  }
}


/* ------------------------------------------------------------
   HEADER STATE OVERRIDES
   ------------------------------------------------------------ */

/* Non-scrolled: tighter gap since nav items don't fill full header height */
#site-header:not(.is-scrolled) .nav-flyout,
#site-header:not(.is-scrolled) .nav-popover {
  top: 100%;
}