/* ===== PHASE 1 ENHANCEMENTS ===== */

/* ===== SKELETON LOADING ===== */
@keyframes shimmer {
  0% { background-position: -400px 0; }
  100% { background-position: 400px 0; }
}
.skeleton {
  background: linear-gradient(90deg, rgba(30,41,59,0.6) 25%, rgba(56,189,248,0.08) 50%, rgba(30,41,59,0.6) 75%);
  background-size: 800px 100%;
  animation: shimmer 1.8s ease-in-out infinite;
  border-radius: var(--radius-sm);
}
.skeleton-kpi {
  height: 100px;
  border-radius: var(--radius-lg);
}
.skeleton-tile {
  height: 220px;
  border-radius: var(--radius-lg);
}
.skeleton-chart {
  height: 300px;
  border-radius: var(--radius-lg);
}
.skeleton-row {
  height: 52px;
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
}

/* ===== SIDEBAR COLLAPSE ===== */
.sidebar-collapse-btn {
  background: rgba(56,189,248,0.1);
  border: 1px solid rgba(56,189,248,0.3);
  color: var(--accent-blue);
  width: 32px; height: 32px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  align-self: center;
  margin: 8px auto 0;
  flex-shrink: 0;
}
.sidebar-collapse-btn:hover {
  color: #fff;
  border-color: var(--accent-blue);
  background: rgba(56,189,248,0.25);
}
.sidebar-collapse-btn svg {
  transition: transform 0.3s ease;
}
.sidebar.collapsed .sidebar-collapse-btn svg {
  transform: rotate(180deg);
}
.sidebar.collapsed {
  width: 72px;
}
.sidebar.collapsed .logo-text,
.sidebar.collapsed .logo-text-row,
.sidebar.collapsed .nav-item span,
.sidebar.collapsed .system-status span {
  display: none;
}
.sidebar.collapsed .sidebar-header {
  padding: 16px 12px 12px;
}
.sidebar.collapsed .brand-logo {
  margin-bottom: 0;
}
.sidebar.collapsed .logo-img {
  max-width: 40px;
}
.sidebar.collapsed .nav-item {
  justify-content: center;
  padding: 12px;
}
.sidebar.collapsed .nav-item svg {
  margin: 0;
}
.sidebar.collapsed .sidebar-footer {
  justify-content: center;
  padding: 12px;
}
.sidebar.collapsed .system-status {
  justify-content: center;
}
.sidebar.collapsed ~ .main-content {
  margin-left: 72px;
}

/* ===== VIEW TOGGLE ===== */
.view-toggle {
  display: flex;
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.view-toggle-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  padding: 8px 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}
.view-toggle-btn:hover {
  color: var(--text-primary);
}
.view-toggle-btn.active {
  background: rgba(56,189,248,0.15);
  color: var(--accent-blue);
}

/* ===== TABLE VIEW ===== */
.data-table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--bg-card);
}
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}
.data-table thead {
  position: sticky;
  top: 0;
  z-index: 2;
}
.data-table th {
  background: rgba(15,23,42,0.98);
  color: var(--text-muted);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
  transition: var(--transition);
}
.data-table th:hover {
  color: var(--accent-blue);
}
.data-table th .sort-icon {
  display: inline-block;
  margin-left: 4px;
  opacity: 0.4;
  font-size: 0.7rem;
}
.data-table th.sorted .sort-icon {
  opacity: 1;
  color: var(--accent-blue);
}
.data-table td {
  padding: 14px 16px;
  border-bottom: 1px solid rgba(148,163,184,0.06);
  color: var(--text-secondary);
  vertical-align: middle;
  white-space: nowrap;
}
.data-table tbody tr {
  transition: var(--transition);
  cursor: pointer;
}
.data-table tbody tr:hover {
  background: var(--bg-hover);
}
.data-table tbody tr:hover td {
  color: var(--text-primary);
}
.data-table .serial-cell {
  font-family: 'Courier New', monospace;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ===== SLIDE-OUT PANEL ===== */
.slide-panel-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
  z-index: 900;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.slide-panel-overlay.active {
  opacity: 1;
  pointer-events: all;
}
.slide-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: 520px;
  max-width: 90vw;
  height: 100vh;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border);
  box-shadow: -12px 0 48px rgba(0,0,0,0.5);
  z-index: 901;
  transform: translateX(100%);
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.slide-panel.active {
  transform: translateX(0);
}
.slide-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.slide-panel-header h3 {
  font-size: 1.1rem;
  font-weight: 700;
}
.slide-panel-nav {
  display: flex;
  gap: 6px;
  align-items: center;
}
.slide-panel-nav button {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-muted);
  width: 32px; height: 32px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  font-size: 1rem;
}
.slide-panel-nav button:hover {
  border-color: var(--border-glow);
  color: var(--text-primary);
}
.slide-panel-nav button:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}
.slide-panel-body {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
}
.slide-panel-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 12px;
  justify-content: flex-end;
  flex-shrink: 0;
  background: var(--bg-secondary);
  min-height: 64px;
  align-items: center;
}

/* ===== INLINE ADD-NEW INPUT ===== */
.inline-add-wrapper {
  position: relative;
}
.inline-add-input-row {
  display: flex;
  gap: 6px;
  padding: 4px;
  border-top: 1px solid var(--border);
  margin-top: 4px;
  animation: fadeIn 0.2s ease;
}
.inline-add-input-row input {
  flex: 1;
  background: var(--bg-glass);
  border: 1px solid var(--border-glow);
  color: var(--text-primary);
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 0.85rem;
  font-family: inherit;
  outline: none;
}
.inline-add-input-row button {
  padding: 6px 10px;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 600;
  transition: var(--transition);
}
.inline-add-input-row .add-confirm {
  background: var(--accent-green);
  color: #0a0e1a;
}
.inline-add-input-row .add-cancel {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
}

/* ===== STAGGERED TILE ANIMATIONS ===== */
@keyframes tileEnter {
  from { opacity: 0; transform: translateY(16px) scale(0.97); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
.tile, .emp-tile {
  animation: tileEnter 0.4s cubic-bezier(0.4, 0, 0.2, 1) backwards;
}
.tile:nth-child(1), .emp-tile:nth-child(1) { animation-delay: 0.02s; }
.tile:nth-child(2), .emp-tile:nth-child(2) { animation-delay: 0.06s; }
.tile:nth-child(3), .emp-tile:nth-child(3) { animation-delay: 0.10s; }
.tile:nth-child(4), .emp-tile:nth-child(4) { animation-delay: 0.14s; }
.tile:nth-child(5), .emp-tile:nth-child(5) { animation-delay: 0.18s; }
.tile:nth-child(6), .emp-tile:nth-child(6) { animation-delay: 0.22s; }
.tile:nth-child(7), .emp-tile:nth-child(7) { animation-delay: 0.26s; }
.tile:nth-child(8), .emp-tile:nth-child(8) { animation-delay: 0.30s; }
.tile:nth-child(9), .emp-tile:nth-child(9) { animation-delay: 0.34s; }
.tile:nth-child(10), .emp-tile:nth-child(10) { animation-delay: 0.38s; }
.tile:nth-child(n+11), .emp-tile:nth-child(n+11) { animation-delay: 0.40s; }

/* ===== CHART TOOLTIP ===== */
.chart-tooltip {
  position: absolute;
  background: rgba(15,23,42,0.96);
  border: 1px solid var(--border-glow);
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 0.82rem;
  color: var(--text-primary);
  pointer-events: none;
  z-index: 100;
  box-shadow: 0 4px 20px rgba(0,0,0,0.5);
  white-space: nowrap;
  opacity: 0;
  transition: opacity 0.15s ease;
}
.chart-tooltip.visible {
  opacity: 1;
}
.chart-tooltip-label {
  color: var(--text-muted);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.chart-tooltip-value {
  font-size: 1rem;
  font-weight: 700;
  margin-top: 2px;
}
.chart-body {
  position: relative;
}

/* ===== COLOR-CODED STATUS LEFT BORDER ===== */
.tile.status-active { border-left: 3px solid var(--accent-green); }
.tile.status-non-op { border-left: 3px solid var(--accent-red); }
.tile.status-awaiting { border-left: 3px solid var(--accent-amber); }

/* ===== BETTER EMPTY STATES ===== */
.empty-state {
  text-align: center;
  padding: 80px 20px;
  color: var(--text-muted);
}
.empty-state-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 20px;
  background: rgba(56,189,248,0.06);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px dashed var(--border);
}
.empty-state-icon svg {
  opacity: 0.5;
}
.empty-state h4 {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}
.empty-state p {
  font-size: 0.9rem;
  max-width: 320px;
  margin: 0 auto 20px;
  line-height: 1.6;
}

/* ===== MOBILE BOTTOM NAV ===== */
.bottom-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  z-index: 200;
  backdrop-filter: blur(20px);
  padding: 6px 0 env(safe-area-inset-bottom, 8px);
}
.bottom-nav-items {
  display: flex;
  justify-content: space-around;
  align-items: center;
}
.bottom-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 8px 12px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.65rem;
  font-weight: 600;
  transition: var(--transition);
  border-radius: 8px;
  position: relative;
}
.bottom-nav-item.active {
  color: var(--accent-blue);
}
.bottom-nav-item.active::before {
  content: '';
  position: absolute;
  top: -6px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 3px;
  background: var(--accent-blue);
  border-radius: 0 0 3px 3px;
}
.bottom-nav-item svg {
  width: 20px;
  height: 20px;
}

/* ===== KEYBOARD SHORTCUT HINT ===== */
.kbd-hint {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  font-size: 0.68rem;
  color: var(--text-muted);
  opacity: 0.6;
  margin-left: 8px;
}
.kbd {
  background: rgba(148,163,184,0.1);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 5px;
  font-family: 'Inter', monospace;
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.3px;
}

/* ===== RESPONSIVE OVERRIDES ===== */
@media (max-width: 768px) {
  .sidebar.collapsed ~ .main-content {
    margin-left: 0;
  }
  .bottom-nav {
    display: block;
  }
  .main-content {
    padding-bottom: 80px;
  }
  .sidebar-collapse-btn {
    display: none;
  }
  .view-toggle {
    display: none;
  }
  .kbd-hint {
    display: none;
  }
  .slide-panel {
    width: 100vw;
    max-width: 100vw;
  }
}