/* ==========================================================================
   Shared layout — header, primary navigation, footer, breadcrumbs
   ========================================================================== */

/* Header ----------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  background: var(--glass-strong);
  -webkit-backdrop-filter: var(--blur);
  backdrop-filter: var(--blur);
  border-bottom: 1px solid var(--hairline);
  box-shadow: var(--shadow-sm);
}

.nav {
  max-width: var(--maxw);
  height: 100%;
  margin: 0 auto;
  padding: 0 1.4rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.nav__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 750;
  color: var(--ink-900);
  letter-spacing: -0.02em;
  font-size: 1.06rem;
  margin-right: 0.6rem;
  white-space: nowrap;
}
.nav__brand:hover { text-decoration: none; color: var(--ink-900); }

.nav__logo {
  width: 30px; height: 30px;
  display: grid; place-items: center;
  border-radius: 9px;
  background: linear-gradient(150deg, #ffffff, #d7dde6);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
  font-weight: 800;
  color: var(--accent-strong);
  font-size: 0.9rem;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  list-style: none;
  margin: 0;
  padding: 0;
  flex: 1;
}

/* the donation item is pushed to the far right */
.nav__links .nav__spacer { margin-left: auto; }

.nav__link {
  display: inline-block;
  padding: 0.46rem 0.72rem;
  border-radius: 999px;
  color: var(--ink-500);
  font-size: 0.92rem;
  font-weight: 550;
  white-space: nowrap;
  transition: background 0.15s ease, color 0.15s ease;
}
.nav__link:hover {
  background: var(--glass);
  color: var(--ink-900);
  text-decoration: none;
}
.nav__link.is-active {
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-weight: 650;
}

.nav__link--donate {
  color: var(--sponsor);
  font-weight: 650;
  border: 1px solid rgba(214, 51, 108, 0.28);
  background: var(--sponsor-soft);
}
.nav__link--donate:hover {
  background: rgba(214, 51, 108, 0.16);
  color: var(--sponsor);
}
.nav__link--donate::before { content: "♥"; margin-right: 0.35rem; }

/* Dropdown (Platforms) --------------------------------------------------- */

.nav__dd { position: relative; }
.nav__dd-toggle { cursor: pointer; }
.nav__dd-toggle::after {
  content: "▾";
  font-size: 0.7rem;
  margin-left: 0.28rem;
  opacity: 0.7;
}
.nav__dd-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 178px;
  padding: 0.4rem;
  list-style: none;
  margin: 0;
  background: #ffffff;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity 0.16s ease, transform 0.16s ease, visibility 0.16s;
}
.nav__dd:hover .nav__dd-menu,
.nav__dd:focus-within .nav__dd-menu,
.nav__dd-menu:hover {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.nav__dd-menu a {
  display: block;
  padding: 0.5rem 0.7rem;
  border-radius: 8px;
  color: var(--ink-600, var(--ink-500));
  font-size: 0.9rem;
}
.nav__dd-menu a:hover { background: var(--glass); color: var(--ink-900); text-decoration: none; }

/* Mobile nav toggle ------------------------------------------------------ */

.nav__toggle {
  display: none;
  margin-left: auto;
  width: 42px; height: 42px;
  border: 1px solid var(--hairline);
  border-radius: 11px;
  background: var(--glass);
  cursor: pointer;
  align-items: center;
  justify-content: center;
}
.nav__toggle span,
.nav__toggle span::before,
.nav__toggle span::after {
  content: "";
  display: block;
  width: 18px; height: 2px;
  background: var(--ink-700);
  border-radius: 2px;
  position: relative;
  transition: transform 0.2s ease;
}
.nav__toggle span::before { position: absolute; top: -6px; }
.nav__toggle span::after { position: absolute; top: 6px; }

@media (max-width: 900px) {
  .nav__toggle { display: inline-flex; }
  .nav__links {
    position: absolute;
    top: var(--header-h);
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0.15rem;
    padding: 0.8rem;
    /* Solid, opaque panel — it covers page content, so blur is pointless and
       a nested backdrop-filter can suppress the background paint. */
    background: #ffffff;
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
    border-bottom: 1px solid var(--hairline);
    box-shadow: var(--shadow-md);
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    display: none;
  }
  .nav__links.is-open { display: flex; }
  .nav__links .nav__spacer { margin-left: 0; }
  .nav__link { padding: 0.7rem 0.9rem; }
  .nav__dd-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    background: transparent;
    padding: 0.1rem 0 0.1rem 0.9rem;
  }
}

/* Footer ----------------------------------------------------------------- */

.site-footer {
  border-top: 1px solid var(--hairline);
  background: var(--glass);
  -webkit-backdrop-filter: var(--blur);
  backdrop-filter: var(--blur);
  margin-top: 3rem;
}
.site-footer__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 2.2rem 1.4rem;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 2rem;
}
.site-footer__brand { font-weight: 750; color: var(--ink-900); font-size: 1.05rem; }
.site-footer__tag { color: var(--ink-500); font-size: 0.92rem; margin-top: 0.4rem; max-width: 34ch; }
.site-footer h4 {
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-400);
  margin: 0 0 0.7rem;
}
.site-footer__col ul { list-style: none; margin: 0; padding: 0; }
.site-footer__col li { margin: 0.35rem 0; }
.site-footer__col a { color: var(--ink-500); font-size: 0.92rem; }
.site-footer__col a:hover { color: var(--accent-strong); }
.site-footer__bar {
  border-top: 1px solid var(--hairline);
  padding: 1rem 1.4rem;
  text-align: center;
  color: var(--ink-400);
  font-size: 0.84rem;
}

@media (max-width: 720px) {
  .site-footer__inner { grid-template-columns: 1fr 1fr; }
  .site-footer__brand-col { grid-column: 1 / -1; }
}

/* Breadcrumbs ------------------------------------------------------------ */

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--ink-400);
  margin-bottom: 1.3rem;
}
.breadcrumbs a { color: var(--ink-500); }
.breadcrumbs .sep { opacity: 0.5; }