/* Shared top navigation bar for all g4mm4.net frontends.
 * Include via:
 *   <link rel="stylesheet" href="https://www.g4mm4.net/shared/nav.css">
 *   <script src="https://www.g4mm4.net/shared/nav.js" defer></script>
 */

.g4mm4-nav {
  --g4mm4-nav-bg: #0b0f19;
  --g4mm4-nav-text: #e2e8f0;
  --g4mm4-nav-muted: #94a3b8;
  --g4mm4-nav-accent: #3b82f6;
  --g4mm4-nav-hover: rgba(59, 130, 246, 0.15);
  --g4mm4-nav-border: rgba(148, 163, 184, 0.15);

  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: 3.5rem;
  padding: 0 1rem;
  background: var(--g4mm4-nav-bg);
  border-bottom: 1px solid var(--g4mm4-nav-border);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
  font-size: 0.875rem;
  line-height: 1.25rem;
  color: var(--g4mm4-nav-text);
  box-sizing: border-box;
}

.g4mm4-nav *,
.g4mm4-nav *::before,
.g4mm4-nav *::after {
  box-sizing: inherit;
}

.g4mm4-nav__brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--g4mm4-nav-text);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.025em;
  white-space: nowrap;
}

.g4mm4-nav__brand:hover {
  color: var(--g4mm4-nav-accent);
}

.g4mm4-nav__logo {
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 0.25rem;
  background: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 800;
  color: #fff;
}

.g4mm4-nav__menu {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
  overflow-x: auto;
  scrollbar-width: none;
}

.g4mm4-nav__menu::-webkit-scrollbar {
  display: none;
}

.g4mm4-nav__item {
  flex: 0 0 auto;
}

.g4mm4-nav__link {
  display: block;
  padding: 0.5rem 0.75rem;
  border-radius: 0.375rem;
  color: var(--g4mm4-nav-muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.15s ease, background-color 0.15s ease;
}

.g4mm4-nav__link:hover,
.g4mm4-nav__link:focus {
  color: var(--g4mm4-nav-text);
  background: var(--g4mm4-nav-hover);
  outline: none;
}

.g4mm4-nav__link--active {
  color: var(--g4mm4-nav-text);
  background: var(--g4mm4-nav-hover);
  font-weight: 600;
}

.g4mm4-nav__toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  border: 1px solid var(--g4mm4-nav-border);
  border-radius: 0.375rem;
  background: transparent;
  color: var(--g4mm4-nav-text);
  cursor: pointer;
}

.g4mm4-nav__toggle:hover {
  background: var(--g4mm4-nav-hover);
}

@media (max-width: 768px) {
  .g4mm4-nav__toggle {
    display: flex;
  }

  .g4mm4-nav__menu {
    position: absolute;
    top: 3.5rem;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    max-height: 0;
    overflow: hidden;
    background: var(--g4mm4-nav-bg);
    border-bottom: 1px solid transparent;
    transition: max-height 0.2s ease, border-color 0.2s ease;
  }

  .g4mm4-nav__menu.is-open {
    max-height: calc(100vh - 3.5rem);
    border-bottom-color: var(--g4mm4-nav-border);
    overflow-y: auto;
  }

  .g4mm4-nav__link {
    padding: 0.875rem 1rem;
    border-radius: 0;
  }
}

/* Push page content down so the fixed nav does not overlap it.
 * Apps can override this if they already account for the nav themselves.
 */
body.g4mm4-nav-padded {
  padding-top: 3.5rem;
}