/**
 * header.css
 * Two-row site header: topbar (Row 1) + main nav (Row 2).
 * Sticky behaviour, mobile hamburger menu, Media dropdown.
 * Depends on: tokens.css, base.css, motion.css
 */

/* --------------------------------------------------------------------------
 * Site header wrapper
 * -------------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background-color: var(--color-bg);
  transition: box-shadow var(--dur-base) var(--ease-out);
}

.site-header.is-scrolled {
  box-shadow: 0 1px 0 var(--color-hairline);
}

/* --------------------------------------------------------------------------
 * Row 1: Topbar
 * -------------------------------------------------------------------------- */

.topbar {
  background-color: var(--color-ink-900);
  color: var(--color-bg);
  height: var(--topbar-height-desktop);
  overflow: hidden;
  max-height: var(--topbar-height-desktop);
  transition: max-height var(--dur-slow) var(--ease-in-out);
}

.site-header.topbar-collapsed .topbar {
  max-height: 0;
}

.topbar__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-inline: var(--container-pad);
  max-width: var(--container-max);
  margin-inline: auto;
}

.topbar__contact {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 400;
  color: var(--color-bg);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease-out);
}

.topbar__contact:hover {
  color: var(--color-brand-green);
}

.topbar__contact .icon {
  color: var(--color-brand-green);
}

.topbar__socials {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

.topbar__social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-bg);
  transition: color var(--dur-fast) var(--ease-out);
  width: 20px;
  height: 20px;
}

.topbar__social-link:hover {
  color: var(--color-brand-green);
}

/* Mobile: hide socials, topbar mobile height */
@media (max-width: 767px) {
  .topbar {
    height: var(--topbar-height-mobile);
    max-height: var(--topbar-height-mobile);
  }

  .site-header.topbar-collapsed .topbar {
    max-height: 0;
  }

  .topbar__socials {
    display: none;
  }
}

/* --------------------------------------------------------------------------
 * Row 2: Main navigation bar
 * -------------------------------------------------------------------------- */

.main-nav-bar {
  background-color: var(--color-bg);
  border-bottom: var(--border-hairline);
  height: var(--header-height-desktop);
}

.main-nav-bar__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-inline: var(--container-pad);
  max-width: var(--container-max);
  margin-inline: auto;
}

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

.site-logo img {
  width: 200px;
  height: auto;
}

/* --------------------------------------------------------------------------
 * Desktop navigation
 * -------------------------------------------------------------------------- */

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
}

.nav__item {
  position: relative;
}

.nav__link {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: var(--ls-nav);
  color: var(--color-ink-700);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding-bottom: 4px;
  white-space: nowrap;
  transition: color var(--dur-fast) var(--ease-out);
}

.nav__link:hover,
.nav__item--active .nav__link {
  color: var(--color-ink-900);
}

/* --------------------------------------------------------------------------
 * Media dropdown (desktop)
 * -------------------------------------------------------------------------- */

.nav__item--dropdown {
  position: relative;
}

.nav__item--dropdown .nav__link {
  cursor: pointer;
  position: relative; /* Anchors the ::after hit-area extension below */
}

.nav__dropdown {
  position: absolute;
  top: calc(100% + 10px);
  left: -20px;
  width: 320px;
  background-color: var(--color-surface);
  border: var(--border-hairline);
  box-shadow: 0 4px 16px rgba(20, 20, 15, 0.08);
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition:
    opacity var(--dur-base) var(--ease-out),
    transform var(--dur-base) var(--ease-out);
  z-index: 100;
}

/* Invisible hover bridge across the 10px gap between the "Media" link and the
   panel. Without it the pointer leaves .nav__item--dropdown mid-gap and the
   panel closes before it can be reached. Spans the full panel width so a
   diagonal move toward any item stays inside the hover target. */
.nav__dropdown::before {
  content: '';
  position: absolute;
  bottom: 100%;
  left: 0;
  right: 0;
  height: 18px;
}

/* Widen the trigger's own hit area downward so the pointer does not fall out
   of the nav item between the text baseline and the bridge. */
.nav__item--dropdown > .nav__link::after {
  content: '';
  position: absolute;
  inset: 0 0 -12px 0;
}

.nav__item--dropdown:hover .nav__dropdown,
.nav__item--dropdown:focus-within .nav__dropdown {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.nav__dropdown-list {
  list-style: none;
  padding: var(--space-2) 0;
}

.nav__dropdown-link {
  display: block;
  padding: var(--space-3) var(--space-5);
  font-size: var(--text-body-sm);
  font-weight: 500;
  color: var(--color-ink-700);
  text-decoration: none;
  transition:
    background-color var(--dur-fast) var(--ease-out),
    color var(--dur-fast) var(--ease-out);
}

.nav__dropdown-link:hover {
  background-color: var(--color-brand-green-soft);
  color: var(--color-ink-900);
}

/* --------------------------------------------------------------------------
 * Hamburger button (mobile only)
 * -------------------------------------------------------------------------- */

.nav-hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  color: var(--color-ink-900);
  flex-direction: column;
  align-items: flex-end;
  gap: 5px;
  line-height: 0;
  margin: 0;
}

.nav-hamburger .icon {
  color: var(--color-ink-900);
}

/* --------------------------------------------------------------------------
 * Mobile menu overlay
 * -------------------------------------------------------------------------- */

.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  background-color: var(--color-bg);
  z-index: 300;
  overflow-y: auto;
  padding: var(--space-6) var(--container-pad);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-base) var(--ease-out);
}

.mobile-menu.is-open {
  opacity: 1;
  pointer-events: auto;
}

.mobile-menu__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-10);
}

.mobile-menu__close {
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  color: var(--color-ink-900);
  display: flex;
  align-items: center;
  justify-content: center;
}

.mobile-nav {
  list-style: none;
  padding: 0;
}

.mobile-nav__item {
  border-bottom: var(--border-hairline);
}

.mobile-nav__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-6) 0;
  font-size: clamp(22px, 4vw, 28px);
  font-weight: 500;
  color: var(--color-ink-900);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease-out);
}

.mobile-nav__link:hover,
.mobile-nav__item--active .mobile-nav__link {
  color: var(--color-brand-green);
}

.mobile-nav__item--active .mobile-nav__link {
  border-left: 3px solid var(--color-brand-green);
  padding-left: var(--space-4);
}

/* Mobile media accordion */
.mobile-accordion__toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-6) 0;
  font-size: clamp(22px, 4vw, 28px);
  font-weight: 500;
  color: var(--color-ink-900);
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
}

.mobile-accordion__toggle .icon {
  transition: transform var(--dur-base) var(--ease-out);
  flex-shrink: 0;
}

.mobile-accordion__toggle[aria-expanded="true"] .icon {
  transform: rotate(180deg);
}

.mobile-accordion__content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--dur-slow) var(--ease-in-out);
}

.mobile-accordion__content.is-open {
  max-height: 500px;
}

.mobile-dropdown-list {
  list-style: none;
  padding: 0 0 var(--space-6) var(--space-4);
}

.mobile-dropdown-link {
  display: block;
  padding: var(--space-3) 0;
  font-size: var(--text-body);
  color: var(--color-ink-500);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease-out);
}

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

.mobile-menu__contact {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-body-lg);
  color: var(--color-ink-700);
  text-decoration: none;
  margin-top: var(--space-10);
  padding-top: var(--space-6);
  border-top: var(--border-hairline);
}

/* --------------------------------------------------------------------------
 * Responsive: show/hide desktop vs mobile elements
 * -------------------------------------------------------------------------- */

@media (max-width: 1023px) {
  .main-nav-bar {
    height: var(--header-height-mobile);
  }

  .site-logo img {
    width: 150px;
  }

  .nav {
    display: none; /* Hidden on mobile — replaced by mobile-menu overlay */
  }

  .nav-hamburger {
    display: flex;
  }

  .mobile-menu {
    display: block;
  }
}

@media (min-width: 1024px) {
  .nav-hamburger {
    display: none;
  }

  .mobile-menu {
    display: none !important;
  }
}