:root {
  --bg: #F0F4F8;
  --surface: #FFFFFF;
  --surface-raised: #FAFBFC;
  --border: #E2E8F0;
  --text-primary: #0F172A;
  --text-secondary: #64748B;
  --text-muted: #94A3B8;
  --accent: #3B82F6;
  --accent-dark: #1D4ED8;
  --optimal: #059669;
  --optimal-bg: #D1FAE5;
  --optimal-border: #6EE7B7;
  --borderline: #D97706;
  --borderline-bg: #FEF3C7;
  --borderline-border: #FCD34D;
  --danger: #DC2626;
  --danger-bg: #FEE2E2;
  --danger-border: #FCA5A5;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.10), 0 2px 4px rgba(0,0,0,0.06);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  min-height: 100vh;
  font-size: 15px;
  line-height: 1.5;
}

/* ── Header ── */
header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.logo-mark {
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, #059669 0%, #3B82F6 100%);
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.logo-mark svg {
  width: 18px;
  height: 18px;
  fill: white;
}

.logo-text {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.3px;
}

.logo-text span {
  color: var(--optimal);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-meta {
  font-size: 13px;
  color: var(--text-secondary);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.15s;
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: white;
}

.btn-primary:hover {
  background: var(--accent-dark);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  background: var(--bg);
  color: var(--text-primary);
}

/* ── Main layout ── */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 20px 48px;
}

/* ── Summary strip ── */
.summary-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}

.summary-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  box-shadow: var(--shadow);
}

.summary-label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.summary-value {
  font-size: 26px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}

.summary-value.optimal { color: var(--optimal); }
.summary-value.borderline { color: var(--borderline); }
.summary-value.danger { color: var(--danger); }

.summary-sub {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}

/* ── Filter tabs ── */
.filter-bar {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.filter-tab {
  padding: 7px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: 1.5px solid var(--border);
  background: var(--surface);
  color: var(--text-secondary);
  transition: all 0.15s;
}

.filter-tab:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.filter-tab.active {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

/* ── Marker grid ── */
.marker-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 14px;
}

.marker-card {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.marker-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  border-radius: 12px 0 0 12px;
}

.marker-card.status-optimal::before { background: var(--optimal); }
.marker-card.status-borderline::before { background: var(--borderline); }
.marker-card.status-danger::before { background: var(--danger); }
.marker-card.status-none::before { background: var(--border); }

.marker-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.marker-card.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(59,130,246,0.15);
}

.marker-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 10px;
}

.marker-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.status-badge {
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 10px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.status-badge.optimal {
  background: var(--optimal-bg);
  color: var(--optimal);
  border: 1px solid var(--optimal-border);
}

.status-badge.borderline {
  background: var(--borderline-bg);
  color: var(--borderline);
  border: 1px solid var(--borderline-border);
}

.status-badge.danger {
  background: var(--danger-bg);
  color: var(--danger);
  border: 1px solid var(--danger-border);
}

.status-badge.none {
  background: #F1F5F9;
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.marker-value-row {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 6px;
}

.marker-value {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.5px;
  line-height: 1;
}

.marker-unit {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
}

.marker-trend {
  margin-left: auto;
  font-size: 20px;
  line-height: 1;
}

.trend-up-good { color: var(--optimal); }
.trend-up-bad { color: var(--danger); }
.trend-down-good { color: var(--optimal); }
.trend-down-bad { color: var(--danger); }
.trend-stable { color: var(--text-muted); }

.marker-range {
  font-size: 12px;
  color: var(--text-muted);
}

.marker-range strong {
  color: var(--optimal);
  font-weight: 600;
}

/* ── Detail panel ── */
#detail-panel {
  display: none;
  background: var(--surface);
  border: 1.5px solid var(--accent);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-md);
}

#detail-panel.visible {
  display: block;
}

.detail-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 20px;
}

.detail-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.detail-description {
  font-size: 13px;
  color: var(--text-secondary);
  max-width: 560px;
  line-height: 1.6;
}

.close-detail {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 20px;
  color: var(--text-muted);
  padding: 4px;
  line-height: 1;
}

.close-detail:hover { color: var(--text-primary); }

.range-legend {
  display: flex;
  gap: 20px;
  margin-bottom: 16px;
  font-size: 12px;
  flex-wrap: wrap;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary);
}

.legend-swatch {
  width: 14px;
  height: 10px;
  border-radius: 3px;
}

.legend-swatch.optimal { background: rgba(5,150,105,0.2); border: 1.5px solid var(--optimal); }
.legend-swatch.normal { background: rgba(100,116,139,0.12); border: 1.5px dashed var(--text-muted); }

.chart-container {
  position: relative;
  height: 220px;
}

.history-table {
  margin-top: 20px;
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.history-table th {
  text-align: left;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0 12px 8px 0;
  border-bottom: 1px solid var(--border);
}

.history-table td {
  padding: 8px 12px 8px 0;
  border-bottom: 1px solid var(--border);
  color: var(--text-primary);
}

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

/* ── Add modal ── */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15,23,42,0.5);
  z-index: 200;
  align-items: flex-start;
  justify-content: center;
  padding: 40px 16px;
  overflow-y: auto;
}

.modal-overlay.visible {
  display: flex;
}

.modal {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 28px;
  width: 100%;
  max-width: 560px;
  box-shadow: var(--shadow-md);
  position: relative;
}

.modal-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 6px;
}

.modal-subtitle {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.form-control {
  width: 100%;
  padding: 9px 12px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--text-primary);
  background: var(--surface);
  transition: border-color 0.15s;
}

.form-control:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(59,130,246,0.12);
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.form-field-mini label {
  display: block;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.form-field-mini .form-control {
  font-size: 13px;
  padding: 7px 10px;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

/* ── Empty / loading states ── */
.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-muted);
  font-size: 14px;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .summary-strip {
    grid-template-columns: 1fr 1fr;
  }

  .marker-grid {
    grid-template-columns: 1fr;
  }

  .header-meta {
    display: none;
  }

  .form-grid {
    grid-template-columns: 1fr;
  }

  .range-legend {
    gap: 12px;
  }
}

@media (max-width: 480px) {
  .summary-strip {
    grid-template-columns: 1fr;
  }
}