/* rail.css — navegación canon (rail izquierdo colapsable) para ETH Desk.
   Ver ~/.claude/rules/navigation-canon.md · tokens en style.css :root (aliases → paleta Beacon). */

/* Desktop: el rail reserva el ancho colapsado; pinned reserva el expandido. */
@media (min-width: 1024px) {
  body { padding-left: var(--rail-w-collapsed); }
  html.rail-pinned body { padding-left: var(--rail-w-expanded); }
}

.nav-rail {
  position: fixed; top: 0; left: 0; bottom: 0;
  width: var(--rail-w-collapsed);
  display: flex; flex-direction: column;
  background: var(--surface); border-right: 1px solid var(--hairline);
  z-index: 800; overflow-x: hidden; overflow-y: auto;
  scrollbar-width: none;
  transition: width var(--t-base, 240ms) ease, transform var(--t-base, 240ms) ease;
}
.nav-rail::-webkit-scrollbar { display: none; }

/* Expansión por hover (solo Mac con puntero) y por pin. */
@media (min-width: 1024px) and (hover: hover) {
  .nav-rail:hover { width: var(--rail-w-expanded); box-shadow: var(--shadow-2); }
}
html.rail-pinned .nav-rail { width: var(--rail-w-expanded); }

/* Top: brand + pin.
   Rail colapsado SIN M (la marca vive en el header). El brand sólo aparece expandido. */
.rail-top { display: flex; align-items: center; gap: 8px; padding: 10px 12px; min-height: 56px; }
.rail-brand { display: flex; align-items: center; gap: 11px; text-decoration: none; color: var(--text); flex: 1; min-width: 0; cursor: pointer; background: none; border: 0; padding: 0; text-align: left; }
.rail-logo { width: 34px; height: 34px; border-radius: 9px; flex: 0 0 34px; display: block; }
.rail-brand-text { display: flex; flex-direction: column; line-height: 1; min-width: 0; }
.rail-brand-title { font-family: var(--font-serif); font-size: 18px; font-weight: 500; white-space: nowrap; }
.rail-brand-sub { font-family: var(--font-mono); font-size: 11px; letter-spacing: .22em; text-transform: uppercase; color: var(--text-4); margin-top: 4px; white-space: nowrap; }

/* Colapsado: ocultar brand entero (incluye el chip M) — sólo reaparece al expandir.
   Se oculta el .rail-top completo para no dejar un hueco vacío arriba de la nav. */
@media (min-width: 1024px) {
  .rail-top { display: none; }
  .nav-rail:hover .rail-top, html.rail-pinned .rail-top { display: flex; }
  .nav-rail { padding-top: 8px; }
  .nav-rail:hover, html.rail-pinned .nav-rail { padding-top: 0; }
}
.rail-pin { flex: 0 0 auto; width: 32px; height: 32px; border: 0; background: transparent; color: var(--text-3); font-size: 18px; cursor: pointer; border-radius: 7px; }
.rail-pin:hover { background: var(--surface-2); color: var(--text); }
html.rail-pinned .rail-pin { color: var(--accent); }

/* Nav items */
.rail-nav { display: flex; flex-direction: column; padding: 6px 0; gap: 1px; }
.rail-nav a { display: flex; align-items: center; gap: 12px; min-height: 46px; padding: 0 15px; color: var(--text-2); text-decoration: none; white-space: nowrap; cursor: pointer; }
.rail-nav a:hover { background: var(--surface-2); color: var(--text); }
.rail-nav a.is-active { color: var(--accent); background: var(--accent-soft); box-shadow: inset 3px 0 0 var(--accent); }
.rail-ico { flex: 0 0 26px; width: 26px; text-align: center; font-size: 22px; line-height: 1; display: inline-flex; align-items: center; justify-content: center; }
.rail-ico svg { width: 22px; height: 22px; }
.rail-label { font-size: var(--fs-sm); opacity: 0; transition: opacity var(--t-fast, 160ms) ease; }
.rail-label-2l { white-space: normal; line-height: 1.12; }

/* Dims (técnico/opciones/sentimiento): botones de primer nivel que cuelgan de Magnus Score.
   Hit target reducido a 42px y label más chico para diferenciarlos del item padre. */
.rail-nav a.rail-dim { min-height: 42px; color: var(--text-3); }
.rail-nav a.rail-dim .rail-label { font-size: var(--fs-xs); }
/* Agrupación visual sólo cuando hay label visible (expandido): leve sangrado + guía vertical */
.nav-rail:hover .rail-nav a.rail-dim,
html.rail-pinned .rail-nav a.rail-dim,
.nav-rail.is-open .rail-nav a.rail-dim { padding-left: 26px; }
.nav-rail:hover .rail-nav a.rail-dim::before,
html.rail-pinned .rail-nav a.rail-dim::before,
.nav-rail.is-open .rail-nav a.rail-dim::before {
  content: ""; position: absolute; left: 18px; top: 6px; bottom: 6px; width: 1px;
  background: var(--hairline-strong);
}
.rail-nav a.rail-dim { position: relative; }

/* Bottom: acento de marca (rombo oxblood) + chip + settings */
.rail-bottom { margin-top: auto; padding: 8px 0; border-top: 1px solid var(--hairline); }
.rail-chip { display: flex; align-items: center; gap: 10px; padding: 0 16px; min-height: 32px; color: var(--text-3); overflow: hidden; }
.rail-chip .lan-mini { font-size: var(--fs-2xs); opacity: 0; white-space: nowrap; transition: opacity var(--t-fast, 160ms) ease; }
.rail-bottom .settings-wrap { position: relative; }
.rail-bottom .btn-settings { display: flex; align-items: center; gap: 12px; width: 100%; min-height: 44px; padding: 0 16px; border: 0; background: transparent; color: var(--text-2); cursor: pointer; }
.rail-bottom .btn-settings:hover { background: var(--surface-2); color: var(--text); }
.rail-bottom .btn-settings svg { flex: 0 0 24px; }
.rail-bottom .settings-menu { position: fixed; left: 12px; bottom: 56px; z-index: 1100; background: var(--surface); border: 1px solid var(--hairline-strong); border-radius: var(--r-md); box-shadow: var(--shadow-2); padding: 12px; min-width: 220px; }
.rail-bottom .settings-menu[hidden] { display: none; }
.settings-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 6px 4px; }
.settings-label { font-size: var(--fs-xs); color: var(--text-3); white-space: nowrap; }
.settings-seg { display: inline-flex; gap: 4px; }
.settings-seg button { min-width: 34px; min-height: 32px; padding: 4px 10px; border: 1px solid var(--hairline-strong); background: transparent; color: var(--text-2); border-radius: 7px; cursor: pointer; font-size: var(--fs-xs); font-family: var(--font-mono); }
.settings-seg button:hover { border-color: var(--accent); color: var(--accent); }
.settings-seg button.is-active { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }

/* Mostrar labels cuando el rail está expandido (hover / pinned / drawer abierto) */
.nav-rail:hover .rail-label, html.rail-pinned .rail-label, .nav-rail.is-open .rail-label,
.nav-rail:hover .lan-mini, html.rail-pinned .lan-mini, .nav-rail.is-open .lan-mini { opacity: 1; }

/* Burger + backdrop (tablet / phone) */
.rail-burger { display: none; position: fixed; top: 10px; left: 10px; z-index: 820;
  width: 44px; height: 44px; align-items: center; justify-content: center;
  border: 1px solid var(--hairline-strong); border-radius: 10px;
  background: var(--surface); color: var(--text); font-size: 20px; cursor: pointer; box-shadow: var(--shadow-1); }
.rail-backdrop { position: fixed; inset: 0; background: rgba(10,13,17,0.45);
  -webkit-backdrop-filter: blur(3px); backdrop-filter: blur(3px); z-index: 790; }
.rail-backdrop[hidden] { display: none; }

@media (max-width: 1023px) {
  body { padding-left: 0; }
  .rail-burger { display: flex; }
  .nav-rail { width: var(--rail-w-expanded); transform: translateX(-100%); box-shadow: var(--shadow-3); }
  .nav-rail.is-open { transform: translateX(0); }
  .rail-label, .rail-sub-label, .lan-mini { opacity: 1; }
  .nav-rail .rail-pin { display: none; }
}