/* =========================================================================
   Nexus · layout.css — top-level grid: topbar, rails, main, footer.
   Three-column desktop layout with sticky topbar and footer.
   ========================================================================= */

#nx-app {
  position: relative;
  display: grid;
  grid-template-columns: 280px 1fr 320px;
  grid-template-rows: 56px 1fr 40px;
  grid-template-areas:
    "topbar  topbar topbar"
    "left    main   right"
    "footer  footer footer";
  height: 100vh;
  width: 100vw;
  z-index: 1;
}

/* Topbar */
#nx-topbar {
  grid-area: topbar;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 18px;
  background: linear-gradient(180deg, var(--nx-surface) 0%, var(--nx-bg) 130%);
  border-bottom: 1px solid var(--nx-line);
  box-shadow: var(--nx-shadow-inset);
  position: relative;
  z-index: 5;
}
#nx-topbar::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -1px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--nx-accent-soft) 30%, var(--nx-accent-soft) 70%, transparent);
}

.nx-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-right: 14px;
  border-right: 1px solid var(--nx-line);
  margin-right: 4px;
}
.nx-brand-mark {
  width: 28px; height: 28px;
  display: grid; place-items: center;
  border-radius: var(--nx-radius-sm);
  background:
    radial-gradient(circle at 30% 30%, var(--nx-accent-soft), transparent 70%),
    var(--nx-surface-2);
  border: 1px solid var(--nx-line);
  box-shadow: var(--nx-shadow-inset), 0 0 16px rgba(0, 0, 0, .25);
  color: var(--nx-accent);
}
.nx-brand-name {
  font-family: var(--nx-font-display);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: .01em;
}
.nx-brand-tag {
  font-family: var(--nx-font-vfd);
  font-size: 9px;
  letter-spacing: .25em;
  color: var(--nx-text-2);
  text-transform: uppercase;
}

#nx-topbar .nx-spacer { flex: 1; }

/* Left rail */
#nx-rail-left {
  grid-area: left;
  display: flex;
  flex-direction: column;
  background: linear-gradient(180deg, var(--nx-surface) 0%, var(--nx-bg) 100%);
  border-right: 1px solid var(--nx-line);
  overflow: hidden;
  position: relative;
}
#nx-rail-left::before {
  content: "";
  position: absolute;
  top: 0; bottom: 0; right: 0;
  width: 1px;
  background: linear-gradient(180deg, transparent, var(--nx-accent-soft) 30%, var(--nx-accent-soft) 70%, transparent);
  pointer-events: none;
}

/* Main center */
#nx-main {
  grid-area: main;
  display: grid;
  grid-template-rows: 1fr auto;
  background:
    linear-gradient(180deg, transparent, rgba(0, 0, 0, .15)),
    var(--nx-bg);
  position: relative;
  overflow: hidden;
}

/* Right utility rail */
#nx-rail-right {
  grid-area: right;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 18px 16px;
  background: linear-gradient(180deg, var(--nx-surface) 0%, var(--nx-bg) 100%);
  border-left: 1px solid var(--nx-line);
  overflow-y: auto;
  position: relative;
}

/* Карточки в правом райле — мягкая поверхность с подписью сверху */
.nx-rail-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 14px 14px 16px;
  border-radius: var(--nx-radius);
  background: var(--nx-surface-2);
  border: 1px solid var(--nx-line);
  box-shadow: var(--nx-shadow-inset);
}
.nx-rail-card-tight { padding: 12px 14px 14px; gap: 8px; }
.nx-rail-card-label {
  font-family: var(--nx-font-mono);
  font-size: 9px;
  letter-spacing: .25em;
  text-transform: uppercase;
  color: var(--nx-text-2);
  opacity: .8;
}
#nx-rail-right::before {
  content: "";
  position: absolute;
  top: 0; bottom: 0; left: 0;
  width: 1px;
  background: linear-gradient(180deg, transparent, var(--nx-accent-soft) 30%, var(--nx-accent-soft) 70%, transparent);
  pointer-events: none;
}

/* Footer — тонкая статусная строка, без декора */
#nx-footer {
  grid-area: footer;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 18px;
  background: var(--nx-surface);
  border-top: 1px solid var(--nx-line);
  font-family: var(--nx-font-mono);
  font-size: 10.5px;
  color: var(--nx-text-2);
  letter-spacing: .12em;
  text-transform: uppercase;
  position: relative;
  z-index: 5;
}
.nx-footer-domain { opacity: .7; }
#nx-footer::before {
  content: "";
  position: absolute;
  left: 0; right: 0; top: -1px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--nx-accent-soft) 30%, var(--nx-accent-soft) 70%, transparent);
}
.nx-footer-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.nx-footer-status .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--nx-ok);
  box-shadow: 0 0 6px var(--nx-ok);
}

/* Tablet collapse */
@media (max-width: 1180px) {
  #nx-app { grid-template-columns: 240px 1fr 0; }
  #nx-rail-right { display: none; }
}

/* Mobile collapse — left rail becomes off-canvas; mobile.css handles toggling. */
@media (max-width: 760px) {
  #nx-app {
    grid-template-columns: 1fr;
    grid-template-rows: 52px 1fr 36px;
    grid-template-areas:
      "topbar"
      "main"
      "footer";
  }
  #nx-rail-left {
    position: fixed;
    top: 52px;
    bottom: 36px;
    left: 0;
    width: min(82vw, 320px);
    z-index: 50;
    transform: translateX(-100%);
    transition: transform var(--nx-dur-base) var(--nx-ease);
  }
  #nx-rail-left[data-open="true"] { transform: translateX(0); }
  #nx-rail-right { display: none; }
}