:root {
  --bg-main: #0a0f1d;
  --bg-card: #131c31;
  --bg-card-alt: #18233c;
  --border-color: #243452;
  --text-main: #e8effc;
  --text-muted: #8ea0bc;
  --accent-cyan: #38bdf8;
  --good: #34d399;
  --warn: #fbbf24;
  --danger: #f87171;
  --unknown: #94a3b8;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans KR", sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--font-family);
  background: var(--bg-main);
  color: var(--text-main);
  line-height: 1.5;
  min-height: 100vh;
  padding: 16px;
}

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); border: 0;
}

.app-layout {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 12px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}

.eyebrow {
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  font-weight: 600;
}

.header-title {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 700;
  color: #fff;
}

.header-right {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 6px;
}

.auth-badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 600;
  background: #1e293b;
  border: 1px solid #334155;
  color: #94a3b8;
}

.auth-badge.authenticated {
  background: #064e3b;
  border-color: #059669;
  color: #6ee7b7;
}

.auth-badge.unauthenticated {
  background: #7f1d1d;
  border-color: #dc2626;
  color: #fca5a5;
}

.timestamp {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.app-nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
}

.nav-tab {
  background: var(--bg-card);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s ease;
}

.nav-tab:hover, .nav-tab:focus-visible {
  color: #fff;
  border-color: var(--accent-cyan);
  outline: none;
}

.nav-tab.active {
  background: var(--accent-cyan);
  color: #0f172a;
  border-color: var(--accent-cyan);
}

.tab-pane {
  display: none;
  animation: fadeIn 0.15s ease-in;
}

.tab-pane.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

.metric-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
}

.card-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
}

.card-value {
  font-size: clamp(2rem, 4vw, 2.6rem);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: #fff;
}

.card-value-small {
  font-size: 1.35rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: #fff;
}

.card-status {
  font-size: 0.8rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.status-badge {
  padding: 2px 8px;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 700;
  display: inline-block;
}

.badge-good { background: #064e3b; color: #6ee7b7; border: 1px solid #059669; }
.badge-stale { background: #78350f; color: #fde68a; border: 1px solid #d97706; }
.badge-error { background: #7f1d1d; color: #fca5a5; border: 1px solid #dc2626; }
.badge-unknown { background: #1e293b; color: #94a3b8; border: 1px solid #475569; }
.badge-unsupported { background: #334155; color: #cbd5e1; border: 1px solid #64748b; }

.detail-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.detail-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 18px;
}

.detail-box h3 {
  font-size: 1.05rem;
  margin-bottom: 12px;
  color: #fff;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 8px;
}

.property-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.prop-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.9rem;
}

.prop-row .k { color: var(--text-muted); }
.prop-row .v { font-weight: 600; font-variant-numeric: tabular-nums; color: #fff; }

.notice-banner {
  background: #1e293b;
  border-left: 4px solid var(--accent-cyan);
  padding: 12px 16px;
  border-radius: 6px;
  font-size: 0.85rem;
  color: #cbd5e1;
  margin-bottom: 16px;
}

.scope-note {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.sparkline-wrapper {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 12px;
}

.sparkline-container {
  flex: 1;
  min-width: 240px;
  background: var(--bg-card-alt);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 12px;
}

.sparkline-title {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.sparkline-svg {
  width: 100%;
  height: 60px;
  overflow: visible;
}

.sparkline-path {
  fill: none;
  stroke: var(--accent-cyan);
  stroke-width: 2;
  stroke-linecap: round;
}

.hint-text {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 8px;
}

.cards-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 12px;
}

.list-item-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.list-item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.item-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
}

.devices-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 8px;
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--border-color);
}

.device-chip {
  background: var(--bg-card-alt);
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 0.8rem;
}

.app-footer {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  padding: 16px 0;
  border-top: 1px solid var(--border-color);
}

/* Phase 6 History extensions */
.history-controls {
  display: flex;
  gap: 8px;
  margin: 16px 0;
  flex-wrap: wrap;
}

.sub-tab-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 8px 14px;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.sub-tab-btn:hover {
  background: var(--bg-card-alt);
  color: var(--text-main);
}

.sub-tab-btn.active {
  background: var(--accent-cyan);
  border-color: var(--accent-cyan);
  color: #04101e;
}

.sub-pane {
  display: none;
  flex-direction: column;
  gap: 16px;
}

.sub-pane.active {
  display: flex;
}

.chart-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 16px;
}

.history-svg {
  width: 100%;
  height: 180px;
  display: block;
}

.chart-legend {
  display: flex;
  gap: 16px;
  margin-top: 10px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.table-container {
  overflow-x: auto;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
}

.history-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  text-align: left;
}

.history-table th, .history-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-color);
}

.history-table th {
  background: var(--bg-card-alt);
  color: var(--text-muted);
  font-weight: 600;
}

.history-table tr:last-child td {
  border-bottom: none;
}

@media (max-width: 768px) {
  body { padding: 12px; }
  .header-right { align-items: flex-start; }
  .cards-grid { grid-template-columns: 1fr; }
  .detail-grid { grid-template-columns: 1fr; }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .cards-grid { grid-template-columns: repeat(2, 1fr); }
}