body {
  display: grid;
  grid-template-columns: 240px 1fr;
  grid-template-rows: 56px 1fr;
  grid-template-areas:
    "sidebar topbar"
    "sidebar main";
}

.sidebar {
  grid-area: sidebar;
  background: var(--bg-elev);
  border-right: 1px solid var(--border);
  display: flex; flex-direction: column;
  padding: 16px 0;
  height: 100vh;
  overflow-y: auto;
}
.sidebar-brand-row { display: flex; align-items: center; justify-content: space-between; }
.nav-item-archived { opacity: 0.55; }
.nav-item-archived:hover { opacity: 0.85; }
.nav-badge {
  display: inline-block; margin-left: 6px; padding: 1px 6px;
  font-size: 9px; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.04em; border-radius: 4px;
  background: rgba(229,115,115,0.15); color: var(--danger, #e57373);
  vertical-align: middle;
}
.sidebar-close {
  display: none;
  background: none; border: none; color: var(--text);
  cursor: pointer; padding: 6px; margin-right: 8px;
  border-radius: var(--radius-sm); min-width: 40px; min-height: 40px;
  align-items: center; justify-content: center;
}
.sidebar-close .material-symbols-outlined { font-size: 24px; }
.sidebar-close:hover { background: rgba(255,255,255,0.05); }
@media (max-width: 900px) {
  .sidebar-close { display: inline-flex; }
}
.sidebar .logo {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 24px 24px;
  text-decoration: none;
}
.sidebar .logo-icon {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}
.sidebar .logo-text {
  font: 700 18px var(--font-mono);
  letter-spacing: 0.15em;
  color: var(--primary);
  text-shadow: 0 0 12px var(--primary-glow);
}
.sidebar nav { display: flex; flex-direction: column; }

.nav-group { display: flex; flex-direction: column; }

.nav-group-label {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 24px 4px;
  background: none; border: none; cursor: pointer;
  color: var(--text-dim);
  font: 600 10px var(--font-mono);
  text-transform: uppercase; letter-spacing: 0.12em;
  opacity: 0.5;
  transition: opacity 0.15s;
}
.nav-group-label:hover { opacity: 0.9; }

.nav-chevron { font-size: 10px; transition: transform 0.2s ease; }
.nav-group.collapsed .nav-chevron { transform: rotate(-90deg); }

.nav-group-items {
  display: flex; flex-direction: column; gap: 2px;
  overflow: hidden;
  max-height: 600px;
  transition: max-height 0.25s ease, opacity 0.2s ease;
  opacity: 1;
}
.nav-group.collapsed .nav-group-items { max-height: 0; opacity: 0; }

.nav-group + .nav-group { margin-top: 8px; }

.sidebar nav a {
  padding: 8px 24px;
  color: var(--text-dim);
  border-left: 2px solid transparent;
  font: 500 14px var(--font-ui);
  display: flex; align-items: center; gap: 10px;
}
.sidebar nav a .material-symbols-outlined {
  font-size: 18px; opacity: .6; transition: opacity .15s;
  width: 18px; height: 18px; overflow: hidden;
}
.sidebar nav a:hover .material-symbols-outlined { opacity: .9; }
.sidebar nav a.active .material-symbols-outlined { opacity: 1; color: var(--primary); }
.sidebar nav a:hover { color: var(--text); background: rgba(34, 211, 238, 0.04); }
.sidebar nav a.active {
  color: var(--primary);
  border-left-color: var(--primary);
  background: rgba(34, 211, 238, 0.08);
  box-shadow: inset 0 0 24px rgba(34, 211, 238, 0.06);
}
.sidebar-foot {
  margin-top: auto;
  padding: 16px 24px;
  font: 500 11px var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  display: flex; align-items: center; gap: 8px;
}

.sidebar-hints {
  margin-top: auto;
  display: none;
  flex-direction: column; gap: 2px;
  padding: 8px 0;
  border-top: 1px solid var(--border);
}
.sidebar-hint {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 24px;
  color: var(--accent-gold);
  font: 500 12px var(--font-ui);
  border-left: 2px solid transparent;
  transition: background .12s, border-color .12s;
}
.sidebar-hint:hover { background: rgba(252, 211, 77, 0.06); border-left-color: var(--accent-gold); }
.sidebar-hint .material-symbols-outlined { font-size: 16px; }
.sidebar-hint:hover { text-shadow: none; }

.topbar {
  grid-area: topbar;
  background: var(--bg-elev);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center;
  padding: 0 24px; gap: 20px;
}
.topbar-greeting {
  font: 600 14px var(--font-ui);
  color: var(--text);
  white-space: nowrap;
  flex-shrink: 0;
}
.topbar input {
  flex: 1; max-width: 480px;
  margin: 0 auto;
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 8px 14px;
  color: var(--text); font: 400 14px var(--font-ui);
}
.topbar input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 2px var(--primary-glow); }
.topbar time { font: 500 13px var(--font-mono); color: var(--text-dim); font-variant-numeric: tabular-nums; }
.clock-sec { animation: clockPulse 1s steps(2, start) infinite; }
@keyframes clockPulse { 50% { opacity: .4; } }

main { grid-area: main; padding: 32px; overflow-y: auto; }

/* ── Topbar-Logo (nur mobile sichtbar) ──────────────────────── */
.topbar-logo {
  display: none;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  flex-shrink: 0;
}
.topbar-logo-icon { width: 26px; height: 26px; }
.topbar-logo-text {
  font: 700 16px var(--font-mono);
  letter-spacing: 0.15em;
  color: var(--primary);
  text-shadow: 0 0 10px var(--primary-glow);
}

/* ── Hamburger (nur mobile sichtbar) ────────────────────────── */
.topbar-hamburger {
  display: none;
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  padding: 4px;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  transition: color .15s;
}
.topbar-hamburger:hover { color: var(--text); }
.topbar-hamburger .material-symbols-outlined { font-size: 22px; display: block; }

/* ── Notification-Glocke (immer sichtbar, auch mobile) ──────── */
.notif-wrap { position: relative; display: flex; align-items: center; }
.topbar-notif-btn {
  display: flex; align-items: center; justify-content: center;
  background: none; border: none; color: var(--text-dim);
  cursor: pointer; padding: 4px; border-radius: var(--radius-sm);
  flex-shrink: 0; position: relative; transition: color .15s;
}
.topbar-notif-btn:hover { color: var(--text); }
.topbar-notif-btn .material-symbols-outlined { font-size: 22px; display: block; }
.topbar-notif-badge {
  position: absolute; top: -3px; right: -5px;
  min-width: 16px; height: 16px; padding: 0 4px; background: var(--danger);
  border-radius: 999px; border: 1.5px solid var(--bg-elev);
  font: 600 10px var(--font-mono); line-height: 15px; text-align: center; color: #fff;
}

.topbar-offline-badge {
  position: absolute; top: -3px; right: -5px;
  min-width: 16px; height: 16px; padding: 0 4px; background: var(--primary);
  border-radius: 999px; border: 1.5px solid var(--bg-elev);
  font: 600 10px var(--font-mono); line-height: 15px; text-align: center; color: var(--bg);
}

/* ── Sidebar-Overlay (mobile) ────────────────────────────────── */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.55);
  z-index: calc(var(--z-popover) - 1);
  backdrop-filter: blur(2px);
}
.sidebar-overlay.active { display: block; }

/* ── Responsive Breakpoints ──────────────────────────────────── */
@media (max-width: 900px) {
  body {
    grid-template-columns: 1fr;
    grid-template-rows: 56px 1fr;
    grid-template-areas:
      "topbar"
      "main";
  }

  .sidebar {
    position: fixed;
    left: -260px;
    top: 0;
    bottom: 0;
    width: 240px;
    z-index: var(--z-popover);
    transition: left .25s ease;
    height: 100dvh;
    overflow-y: auto;
  }
  .sidebar.open { left: 0; }

  .topbar {
    position: sticky;
    top: 0;
    z-index: calc(var(--z-popover) - 100);
  }
  .topbar-hamburger { display: flex; align-items: center; }
  .topbar-logo { display: flex; }
  .topbar-logo-text { display: none; }
  .topbar-greeting { display: none; }

  main { padding: 16px; }
}

@media (max-width: 480px) {
  main { padding: 12px; }

  .topbar { padding: 0 12px; gap: 10px; }
  .topbar input { max-width: none; font-size: 13px; }
  .topbar time { display: none; }
}