/* ============ Side navigation ============ */
:root { --rail: 76px; }
body.has-sidenav { padding-left: var(--rail); }
body.has-sidenav .nav, body.has-sidenav .menu, body.has-sidenav .burger { display: none !important; }

.sidenav { position: fixed; z-index: 70; inset: 0 auto 0 0; width: var(--rail); pointer-events: none; }
.sidenav > * { pointer-events: auto; }

/* ---- rail (desktop) ---- */
.sidenav::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: rgba(10, 10, 16, .92); border-right: 1px solid rgba(255,255,255,.08);
  backdrop-filter: blur(16px);
}
.sn-toggle {
  position: absolute; z-index: 3; top: 18px; left: 14px; height: 48px; min-width: 48px;
  display: flex; align-items: center; gap: 12px; padding: 0 14px; border-radius: 14px;
  border: 1px solid rgba(255,255,255,.12); background: #15151f; color: var(--text); cursor: pointer;
  transition: border-color .25s, background .25s, width .4s var(--ease);
}
.sn-toggle:hover { border-color: var(--accent-2); }
.sn-burger { position: relative; width: 18px; height: 14px; flex: none; }
.sn-burger i { position: absolute; left: 0; height: 2px; border-radius: 2px; background: currentColor; transition: transform .45s var(--ease), opacity .25s, width .3s var(--ease), top .45s var(--ease); }
.sn-burger i:nth-child(1) { top: 0; width: 18px; }
.sn-burger i:nth-child(2) { top: 6px; width: 12px; }
.sn-burger i:nth-child(3) { top: 12px; width: 15px; }
.sn-toggle:hover .sn-burger i { width: 18px; }
.sidenav.open .sn-burger i:nth-child(1) { top: 6px; transform: rotate(45deg); width: 18px; }
.sidenav.open .sn-burger i:nth-child(2) { opacity: 0; }
.sidenav.open .sn-burger i:nth-child(3) { top: 6px; transform: rotate(-45deg); width: 18px; }
.sn-current { display: none; align-items: baseline; gap: 8px; font-size: 12px; white-space: nowrap; }
.sn-current b { color: var(--accent-2); font-weight: 600; }
#snLabel.swap { animation: snSwap .45s var(--ease); }
@keyframes snSwap { from { opacity: 0; transform: translateY(8px); } }

.sn-rail { position: absolute; z-index: 2; top: 50%; left: 0; width: var(--rail); transform: translateY(-50%); list-style: none; display: grid; gap: 4px; justify-items: center; }
.sn-rail a { position: relative; display: grid; place-items: center; width: 44px; height: 30px; }
.sn-dot { width: 8px; height: 8px; border-radius: 4px; background: rgba(255,255,255,.22); transition: height .45s var(--ease), background .3s, width .3s; }
.sn-rail a:hover .sn-dot { background: var(--text); }
.sn-rail a.on .sn-dot { height: 26px; background: linear-gradient(var(--accent), var(--accent-2)); }
.sn-tip {
  position: absolute; left: calc(100% + 6px); top: 50%; transform: translate(-6px, -50%); white-space: nowrap;
  padding: 7px 12px; border-radius: 10px; background: #15151f; border: 1px solid rgba(255,255,255,.12);
  font: 600 12px "JetBrains Mono", monospace; color: var(--text); opacity: 0; pointer-events: none;
  transition: opacity .2s, transform .3s var(--ease);
}
.sn-rail a:hover .sn-tip { opacity: 1; transform: translate(0, -50%); }
.sn-rail-cta {
  position: absolute; z-index: 2; bottom: 22px; left: 14px; width: 48px; height: 48px; border-radius: 14px;
  display: grid; place-items: center; font-size: 18px; color: #fff;
  background: linear-gradient(135deg, var(--accent), #5a3cf0); box-shadow: 0 10px 30px -10px var(--accent);
  transition: transform .3s var(--ease);
}
.sn-rail-cta:hover { transform: translateY(-3px) scale(1.05); }

/* ---- panel ---- */
.sn-panel {
  position: absolute; z-index: 2; top: 0; bottom: 0; left: 0; width: min(380px, 100vw);
  display: flex; flex-direction: column; gap: 28px; padding: 92px 28px 28px; overflow-y: auto; overscroll-behavior: contain;
  background: #0b0b12; border-right: 1px solid rgba(255,255,255,.1); box-shadow: 30px 0 80px -30px rgba(0,0,0,.9);
  transform: translateX(-102%); visibility: hidden;
  transition: transform .55s var(--ease), visibility 0s .55s;
}
.sidenav.open .sn-panel { transform: none; visibility: visible; transition: transform .55s var(--ease); }
.sn-scrim { position: fixed; inset: 0; z-index: 1; background: rgba(4,4,8,.55); backdrop-filter: blur(3px); opacity: 0; visibility: hidden; transition: opacity .4s, visibility 0s .4s; }
.sidenav.open .sn-scrim { opacity: 1; visibility: visible; transition: opacity .4s; }

.sn-name { display: block; font-size: 22px; font-weight: 700; letter-spacing: -0.03em; }
.sn-sub { color: var(--muted); font-size: 12px; }
.sn-list { display: grid; gap: 2px; }
.sn-list a {
  position: relative; display: grid; grid-template-columns: 34px 1fr; align-items: center; padding: 11px 12px; border-radius: 12px;
  color: var(--muted); font-size: 17px; font-weight: 500; overflow: hidden;
  opacity: 0; transform: translateX(-16px); transition: opacity .4s, transform .5s var(--ease), color .2s, background .2s;
}
.sidenav.open .sn-list a, .sidenav.open .sn-pages a { opacity: 1; transform: none; transition-delay: calc(var(--i) * 35ms + 120ms), calc(var(--i) * 35ms + 120ms), 0s, 0s; }
.sn-list a:hover, .sn-list a:focus-visible { color: var(--text); background: rgba(255,255,255,.05); outline: 0; }
.sn-list a.on { color: var(--text); background: rgba(255,255,255,.06); }
.sn-n { font-size: 12px; color: var(--muted); }
.sn-list a.on .sn-n { color: var(--accent-2); }
.sn-progress { position: absolute; left: 12px; right: 12px; bottom: 4px; height: 2px; border-radius: 2px; background: rgba(255,255,255,.05); }
.sn-progress i { display: block; height: 100%; width: calc(var(--p, 0) * 100%); border-radius: inherit; background: var(--accent-2); opacity: .7; }
.sn-pages { display: grid; gap: 6px; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.08); }
.sn-pages a { display: flex; justify-content: space-between; padding: 8px 12px; border-radius: 10px; color: var(--muted); font-size: 15px; opacity: 0; transform: translateX(-16px); transition: opacity .4s, transform .5s var(--ease), color .2s, background .2s; }
.sn-pages a:hover, .sn-pages a.on { color: var(--text); background: rgba(255,255,255,.05); }
.sn-pages a span { color: var(--accent-2); }
.sn-foot { margin-top: auto; display: grid; gap: 12px; }
.sn-foot .btn { justify-content: center; color: #fff; }
.sn-mail { color: var(--muted); font-size: 12px; text-align: center; }
.sn-keys { color: var(--muted); font-size: 11px; text-align: center; opacity: .7; }
.sn-keys kbd { font: inherit; padding: 1px 5px; border-radius: 4px; border: 1px solid rgba(255,255,255,.15); }

/* ---- phones and tablets: no rail, a floating pill with the current section ---- */
@media (max-width: 900px) {
  body.has-sidenav { padding-left: 0; }
  .sidenav { width: 0; }
  .sidenav::before, .sn-rail, .sn-rail-cta { display: none; }
  .sn-toggle {
    position: fixed; top: max(12px, env(safe-area-inset-top)); left: 12px; height: 46px; padding: 0 16px 0 14px;
    border-radius: 999px; background: rgba(15,15,22,.92); backdrop-filter: blur(14px);
    box-shadow: 0 12px 30px -12px rgba(0,0,0,.8);
  }
  .sn-current { display: inline-flex; }
  .sn-panel { width: min(340px, 88vw); padding-top: 84px; }
}
@media (min-width: 901px) { .sidenav.away .sn-current { display: none; } }

@media (prefers-reduced-motion: reduce) {
  .sn-panel, .sn-list a, .sn-pages a, .sn-dot { transition: none !important; }
}

/* the floating buttons (bottom right) must never cover the last line of a page, at any width */
footer { padding-bottom: calc(96px + env(safe-area-inset-bottom)) !important; }
.sn-admin {
  display: flex; align-items: center; justify-content: center; gap: 8px; padding: 10px; border-radius: 12px;
  border: 1px dashed rgba(255,255,255,.16); color: var(--muted); font-size: 13px; transition: color .2s, border-color .2s;
}
.sn-admin:hover { color: var(--text); border-color: var(--accent-2); }
.foot-admin { color: var(--muted); transition: color .2s; }
.foot-admin:hover { color: var(--accent-2); }