/* Phone menu: a menu button joins the top bar only when the page's own links are hidden, and
   opens a sheet with the site's pages. Colors follow each page's --accent and --ink. */
.menu-btn { display: none; flex: 0 0 auto; width: 40px; height: 40px; margin-right: -8px; border: 0; border-radius: 10px; background: transparent; color: var(--ink, #141829); cursor: pointer; place-items: center; -webkit-tap-highlight-color: transparent; }
.has-menu .menu-btn { display: grid; }
.menu-btn svg { width: 22px; height: 22px; overflow: visible; }
.menu-btn line { stroke: currentColor; stroke-width: 2.2; stroke-linecap: round; transform-box: fill-box; transform-origin: center; transition: transform .3s cubic-bezier(.2,.7,.2,1), opacity .2s; }
.menu-btn[aria-expanded="true"] .l1 { transform: translateY(6px) rotate(45deg); }
.menu-btn[aria-expanded="true"] .l2 { opacity: 0; }
.menu-btn[aria-expanded="true"] .l3 { transform: translateY(-6px) rotate(-45deg); }
.menu-btn:focus-visible { outline: 3px solid var(--accent, #d2470f); outline-offset: 2px; }

.menu-sheet { position: fixed; left: 0; right: 0; top: calc(var(--menu-top, 44px)); z-index: 70; max-height: calc(100dvh - var(--menu-top, 44px)); overflow-y: auto;
  background: var(--paper, #fbfbfd); border-bottom: 1px solid var(--rule, #dcdfe8); box-shadow: 0 24px 40px -28px rgba(20, 24, 41, .55);
  padding: 8px max(16px, env(safe-area-inset-left, 0px)) calc(18px + env(safe-area-inset-bottom, 0px));
  transform: translateY(-8px); opacity: 0; visibility: hidden; transition: transform .28s cubic-bezier(.2,.7,.2,1), opacity .2s, visibility 0s .28s; }
.menu-sheet.open { transform: none; opacity: 1; visibility: visible; transition: transform .28s cubic-bezier(.2,.7,.2,1), opacity .2s, visibility 0s; }
.menu-sheet nav { display: grid; }
.menu-sheet a { display: flex; justify-content: space-between; align-items: center; gap: 12px; min-height: 52px; padding: 6px 2px; border-bottom: 1px solid var(--rule, #dcdfe8); color: var(--ink, #141829); text-decoration: none;
  font-family: var(--font-display, system-ui); font-weight: 750; font-size: 1.3rem; letter-spacing: -0.01em; }
.menu-sheet a::after { content: "→"; font-family: var(--font-body, system-ui); font-size: 1rem; color: var(--accent, #d2470f); transition: transform .25s; }
.menu-sheet a:active::after { transform: translateX(4px); }
.menu-sheet a[aria-current="page"] { color: var(--accent, #d2470f); }
.menu-sheet a[aria-current="page"]::after { content: "·"; }
.menu-sheet small { display: block; margin: 16px 2px 2px; font-family: var(--font-data, monospace); font-size: .72rem; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3, #8a8fa3); }
.menu-sheet .this a { font-family: var(--font-body, system-ui); font-weight: 650; font-size: 1.02rem; min-height: 46px; }
.menu-sheet .menu-foot { margin: 14px 2px 0; font-family: var(--font-data, monospace); font-size: .7rem; color: var(--ink-3, #8a8fa3); }
.menu-scrim { position: fixed; inset: 0; z-index: 69; background: rgba(20, 24, 41, .25); opacity: 0; visibility: hidden; transition: opacity .2s, visibility 0s .2s; }
.menu-scrim.open { opacity: 1; visibility: visible; transition: opacity .2s, visibility 0s; }
@media (prefers-reduced-motion: reduce) {
  .menu-btn line, .menu-sheet, .menu-scrim { transition: none; }
}
@media print { .menu-btn, .menu-sheet, .menu-scrim { display: none !important; } }