/* Topbar styled by @elements/style/layout.css (.topbar).
   This file adds the mobile hamburger + full-screen takeover menu. */

.topbar-burger {
  display: none;
  width: 28px;
  height: 28px;
  background: transparent;
  border: 0;
  padding: 0;
  cursor: pointer;
  color: var(--ink);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.topbar-burger .burger-bar {
  width: 18px;
  height: 1.5px;
  background: currentColor;
  border-radius: 2px;
}

/* ---- full-screen mobile menu ---- */

.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 100;
  background: var(--bg);
  flex-direction: column;
  opacity: 0;
  pointer-events: none;
  overflow-y: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
  transition: opacity 200ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

/* aurora layer — painted on the fixed menu bounds so it stays put while content scrolls.
   Positions are tuned for portrait viewports so the color actually lands in-frame. */
.mobile-menu::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(ellipse 90% 35% at 30% 15%, rgba(106, 156, 214, 0.18), transparent 70%),
    radial-gradient(ellipse 80% 35% at 75% 40%, rgba(170, 140, 210, 0.12), transparent 70%),
    radial-gradient(ellipse 80% 30% at 50% 65%, rgba(120, 180, 200, 0.10), transparent 72%);
}

/* ambient grid — same 40px / 0.045 lines as the homepage, with a radial mask that fades the grid out at the edges */
.mobile-menu::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(to right,  rgba(23, 23, 26, 0.025) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(23, 23, 26, 0.025) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image:         radial-gradient(ellipse 90% 70% at 50% 30%, black 0%, rgba(0,0,0,0.4) 50%, transparent 85%);
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 30%, black 0%, rgba(0,0,0,0.4) 50%, transparent 85%);
}

.mobile-menu > * { position: relative; z-index: 1; }

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

html:has(.mobile-menu.is-open),
body:has(.mobile-menu.is-open) { overflow: hidden; }

.mobile-menu-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3-5, 0.875rem) var(--space-8);
  background: var(--bg);
  border-bottom: 1px solid var(--rule);
}

.mobile-menu-close {
  appearance: none;
  background: transparent;
  border: 0;
  /* Sized to match the topbar's tallest child (topbar-cta ≈ 28px) so the
     menu-open header is pixel-identical to the underlying topbar and the
     transition doesn't nudge the brand. */
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  cursor: pointer;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 1.25rem;
  line-height: 1;
  padding: 0;
  opacity: 0.85;
  transition: opacity 120ms var(--ease-out, ease);
}

@media (hover: hover) {
  .mobile-menu-close:hover { opacity: 1; }
}

.mobile-menu-nav {
  padding: 1rem var(--space-8) 0;
  display: flex;
  flex-direction: column;
}

.mobile-menu-item {
  display: block;
  padding: 1rem 0;
  border-bottom: 1px solid #e4e4e6;
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  color: var(--ink);
  letter-spacing: -0.005em;
  opacity: 0;
  transform: translateY(4px);
  transition:
    opacity   320ms cubic-bezier(0.2, 0.8, 0.2, 1),
    transform 320ms cubic-bezier(0.2, 0.8, 0.2, 1),
    color     160ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.mobile-menu-item.is-active { color: var(--accent-deep); }

@media (hover: hover) {
  .mobile-menu-item:hover { color: var(--accent-deep); }
}

.mobile-menu-cta-wrap {
  padding: 1.5rem var(--space-8) 0;
  opacity: 0;
  transform: translateY(4px);
  transition:
    opacity   320ms cubic-bezier(0.2, 0.8, 0.2, 1),
    transform 320ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.mobile-menu-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 0.875rem 1.25rem;
  background: var(--ink);
  color: #ffffff;
  font-family: var(--font-mono);
  font-size: 1rem;
  border: 1px solid var(--ink);
  border-radius: var(--radius-sm);
  transition:
    background   160ms cubic-bezier(0.2, 0.8, 0.2, 1),
    border-color 160ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

@media (hover: hover) {
  .mobile-menu-cta:hover {
    background: #000;
    border-color: #000;
  }
}

.mobile-menu-spacer { flex: 1; min-height: 2rem; }

.mobile-menu-foot {
  padding: 1.25rem var(--space-8);
  display: flex;
  flex-direction: column-reverse;
  align-items: flex-start;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.71875rem;
  color: var(--ink-soft);
  border-top: 1px solid var(--rule);
  opacity: 0;
  transform: translateY(4px);
  transition:
    opacity   320ms cubic-bezier(0.2, 0.8, 0.2, 1),
    transform 320ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.mobile-menu-foot a { color: inherit; }

@media (hover: hover) {
  .mobile-menu-foot a:hover { color: var(--ink); }
}

/* stagger on open */
.mobile-menu.is-open .mobile-menu-item,
.mobile-menu.is-open .mobile-menu-cta-wrap,
.mobile-menu.is-open .mobile-menu-foot {
  opacity: 1;
  transform: translateY(0);
}

.mobile-menu.is-open .mobile-menu-item:nth-of-type(1) { transition-delay: 40ms;  }
.mobile-menu.is-open .mobile-menu-item:nth-of-type(2) { transition-delay: 80ms;  }
.mobile-menu.is-open .mobile-menu-item:nth-of-type(3) { transition-delay: 120ms; }
.mobile-menu.is-open .mobile-menu-cta-wrap            { transition-delay: 180ms; }
.mobile-menu.is-open .mobile-menu-foot                { transition-delay: 240ms; }

@media (max-width: 700px) {
  .topbar-nav,
  .topbar-cta { display: none; }

  .topbar-burger { display: inline-flex; }

  .mobile-menu { display: flex; }
}

@media (prefers-reduced-motion: reduce) {
  .mobile-menu,
  .mobile-menu-item,
  .mobile-menu-cta-wrap,
  .mobile-menu-cta,
  .mobile-menu-foot,
  .mobile-menu-close {
    transition: none !important;
  }

  .mobile-menu.is-open .mobile-menu-item,
  .mobile-menu.is-open .mobile-menu-cta-wrap,
  .mobile-menu.is-open .mobile-menu-foot { transition-delay: 0ms !important; }
}