/* ================================================================
   NAVIGATION — Panel, Items, Collapse, System Info, Legal Link
   ================================================================ */

.nav-panel {
  position: relative;
  padding: 16px;
  padding-bottom: 52px;
  height: fit-content;
  max-height: calc(100vh - 48px);
  overflow-y: auto;
  overflow-x: hidden;
  transition: padding 0.3s ease, border-color 0.3s ease;
}

.navigation {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Shared flex-center row for header lines, panel headers, status dot */
.header-line,
.panel-header,
.system-ready {
  display: flex;
  align-items: center;
  gap: 8px;
}

.panel-header { margin-bottom: 8px; }

.dot {
  width: 8px;
  height: 8px;
  background: var(--hud-cyan);
}

.nav-header h2 {
  margin: 0;
  color: var(--hud-cyan);
  font-family: var(--font-display);
  font-size: 0.875rem;
  letter-spacing: 0.1em;
}

.nav-header p,
.system-info p {
  margin: 4px 0 0 16px;
  color: var(--muted-foreground);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.status-info {
  border-left: 2px solid var(--hud-glow);
  padding-left: 12px;
  margin-bottom: 16px;
}

.status-info div,
.row {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin: 4px 0;
  font-size: 0.75rem;
}

.status-info span,
.row span,
.connection > span {
  color: var(--muted-foreground);
}

.status-info b,
.row b {
  color: var(--hud-cyan);
  margin-right: 6px;
  font-weight: 400;
}

.status-info strong,
.row strong {
  color: var(--hud-cyan);
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.06em;
}

/* ── Nav Items ── */

.nav-items {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  border: 0;
  border-left: 2px solid transparent;
  background: transparent;
  color: inherit;
  text-align: left;
  cursor: pointer;
  padding: 12px 8px;
  transition: all 0.3s ease;
}

.nav-item .num {
  width: 32px;
  height: 32px;
  border: 1px solid rgba(107, 138, 154, 0.5);
  color: var(--muted-foreground);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-family: var(--font-display);
}

.nav-item .icon { color: var(--muted-foreground); }

.nav-item .icon svg { width: 20px; height: 20px; }

.nav-item .label {
  color: var(--hud-cyan);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  font-family: var(--font-display);
  transition: opacity 0.25s ease, transform 0.25s ease, max-width 0.25s ease;
}

.nav-item:hover        { background: var(--hud-dim); }
.nav-item:hover .num   { border-color: var(--hud-border-accent); }
.nav-item:hover .label { color: var(--foreground); }

.nav-item.active {
  border-left-color: var(--hud-cyan);
  background: linear-gradient(to right, rgba(0, 229, 255, 0.2), transparent);
}

.nav-item.active .num {
  border-color: var(--hud-cyan);
  color: var(--hud-cyan);
  background: var(--hud-mid);
}

.nav-item.active .icon  { color: var(--hud-cyan); }
.nav-item.active .label { color: var(--foreground); }

/* ── Collapse Button ── */

.collapse-btn {
  margin-top: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
  border: 1px solid var(--hud-glow);
  background: transparent;
  color: var(--hud-cyan);
  cursor: pointer;
  transition: all 0.3s ease;
}

.collapse-btn:hover {
  border-color: var(--hud-cyan);
  background: var(--hud-dim);
}

.collapse-btn svg {
  width: 20px;
  height: 20px;
  transition: transform 0.3s ease;
}

.collapse-btn:hover svg { transform: scale(1.1); }

/* ── Collapsed State ── */

.nav-panel.is-collapsed { border-color: rgba(0, 229, 255, 0.28); }

.nav-panel.is-collapsed:not(.is-expanded) { padding: 12px 10px; }

.nav-panel.is-collapsed:not(.is-expanded) .navigation { gap: 10px; }

.nav-panel.is-collapsed:not(.is-expanded) .nav-header,
.nav-panel.is-collapsed:not(.is-expanded) .status-info,
.nav-panel.is-collapsed:not(.is-expanded) .system-info {
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  margin: 0;
  padding: 0;
  border: 0;
  pointer-events: none;
}

.nav-panel.is-collapsed:not(.is-expanded) .nav-item {
  gap: 8px;
  padding: 10px 6px;
}

.nav-panel.is-collapsed:not(.is-expanded) .nav-item .label {
  opacity: 0;
  width: 0;
  max-width: 0;
  overflow: hidden;
  white-space: nowrap;
  transform: translateX(-8px);
  pointer-events: none;
}

.nav-panel.is-collapsed:not(.is-expanded) .collapse-btn {
  margin-top: 8px;
  padding: 10px 8px;
}

.nav-panel.is-collapsed:not(.is-expanded) .collapse-btn svg { transform: rotate(180deg); }
.nav-panel.is-collapsed.is-expanded .collapse-btn svg        { transform: rotate(0deg); }

/* ── System Info ── */

.system-info {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--hud-border);
}

.system-title {
  color: var(--hud-cyan);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  font-weight: 700;
  font-family: var(--font-display);
}

.system-ready span:last-child,
.connection strong {
  color: var(--hud-green);
  font-family: var(--font-display);
  font-size: 0.75rem;
}

.ready-dot,
.connection em {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--hud-green);
  animation: pulse-dot 1.3s ease-in-out infinite;
}

.nav-legal-link {
  position: absolute;
  left: 16px;
  bottom: 12px;
  color: var(--muted-foreground);
  text-decoration: none;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: color var(--transition-base);
}

.nav-legal-link:hover,
.nav-legal-link:focus-visible { color: var(--hud-cyan); }