:root {
  --surface-1:      #fcfcfb;
  --page-plane:     #f9f9f7;
  --text-primary:   #0b0b0b;
  --text-secondary: #52514e;
  --text-muted:     #898781;
  --gridline:       #e1e0d9;
  --baseline:       #c3c2b7;
  --border:         rgba(11,11,11,0.10);
  --series-1:       #2a78d6;
  --series-1-wash:  rgba(42,120,214,0.10);
  --good:           #006300;
  --card-radius:    10px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --surface-1:      #1a1a19;
    --page-plane:     #0d0d0d;
    --text-primary:   #ffffff;
    --text-secondary: #c3c2b7;
    --text-muted:     #898781;
    --gridline:       #2c2c2a;
    --baseline:       #383835;
    --border:         rgba(255,255,255,0.10);
    --series-1:       #3987e5;
    --series-1-wash:  rgba(57,135,229,0.14);
    --good:           #0ca30c;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--page-plane);
  color: var(--text-primary);
  line-height: 1.4;
}

.page {
  max-width: 880px;
  margin: 0 auto;
  padding: 20px 16px 48px;
}

.app-header h1 {
  margin: 0 0 4px;
  font-size: 1.6rem;
}

.subtitle {
  margin: 0 0 16px;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.card {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: var(--card-radius);
  padding: 18px;
  margin-bottom: 16px;
}

.card h2 {
  margin: 0 0 14px;
  font-size: 1.15rem;
}

.protocol {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: var(--card-radius);
  padding: 12px 16px;
  margin-bottom: 16px;
}

.protocol summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
}

.protocol ul {
  margin: 10px 0 2px;
  padding-left: 20px;
  color: var(--text-secondary);
  font-size: 0.92rem;
}

.protocol li { margin-bottom: 4px; }

.mode-toggle {
  display: inline-flex;
  border: 1px solid var(--baseline);
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 18px;
}

.mode-option {
  padding: 8px 14px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
}

.mode-option:not(:last-child) {
  border-right: 1px solid var(--baseline);
}

.mode-option:has(input:checked) {
  background: var(--series-1-wash);
  color: var(--text-primary);
}

.mode-option input {
  accent-color: var(--series-1);
}

.site-row.site-row-hidden {
  display: none;
}

.field-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 14px;
  margin-bottom: 18px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.field label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

input, select {
  font: inherit;
  padding: 8px 10px;
  border: 1px solid var(--baseline);
  border-radius: 6px;
  background: var(--surface-1);
  color: var(--text-primary);
}

input:focus, select:focus {
  outline: 2px solid var(--series-1);
  outline-offset: 1px;
}

.field-error {
  color: #e34948;
  font-size: 0.78rem;
  min-height: 1em;
}

.sites-heading {
  margin: 0 0 4px;
  font-size: 1rem;
}

.hint {
  margin: 0 0 12px;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.sites-grid {
  display: grid;
  gap: 12px;
  margin-bottom: 18px;
}

.site-row {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  display: grid;
  grid-template-columns: auto minmax(90px, 1fr) 90px;
  gap: 8px;
  align-items: center;
}

.site-row .site-label {
  font-weight: 600;
  font-size: 0.9rem;
}

.site-row input {
  width: 100%;
  padding: 6px 8px;
}

.info-btn {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--baseline);
  background: transparent;
  color: var(--text-secondary);
  font-weight: 700;
  font-size: 0.85rem;
  cursor: pointer;
  padding: 0;
}

.info-btn:hover,
.info-btn[aria-expanded="true"] {
  background: var(--series-1-wash);
  color: var(--text-primary);
}

.site-error {
  grid-column: 1 / -1;
  color: #e34948;
  font-size: 0.78rem;
}

.site-instruction {
  grid-column: 1 / -1;
  margin: 2px 0 0;
  padding-top: 8px;
  border-top: 1px solid var(--gridline);
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.protocol-sites-heading {
  margin: 14px 0 8px;
  font-size: 0.95rem;
}

.site-instructions-list {
  margin: 0;
  display: grid;
  grid-template-columns: minmax(90px, auto) 1fr;
  gap: 6px 12px;
  font-size: 0.88rem;
}

.site-instructions-list dt {
  font-weight: 600;
  color: var(--text-primary);
}

.site-instructions-list dd {
  margin: 0;
  color: var(--text-secondary);
}

.actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.btn {
  font: inherit;
  font-weight: 600;
  padding: 9px 18px;
  border-radius: 7px;
  border: 1px solid transparent;
  cursor: pointer;
}

.btn-primary {
  background: var(--series-1);
  color: #ffffff;
}

.btn-primary:hover { filter: brightness(1.05); }

.btn-secondary {
  background: transparent;
  border-color: var(--baseline);
  color: var(--text-primary);
}

.btn-secondary:hover { background: var(--series-1-wash); }

.btn-danger {
  background: transparent;
  border: 1px solid var(--baseline);
  color: #e34948;
  padding: 4px 10px;
  font-size: 0.8rem;
  border-radius: 6px;
  cursor: pointer;
}

.btn-danger:hover { background: rgba(227,73,72,0.10); }

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 16px;
}

.result-block h3 {
  margin: 0 0 8px;
  font-size: 0.95rem;
}

.result-block dl {
  margin: 0;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4px 10px;
}

.result-block dt {
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.result-block dd {
  margin: 0;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.bf-value {
  font-weight: 700;
  font-size: 1.05rem;
}

.muted { color: var(--text-muted); font-weight: 400; }

.save-confirm {
  color: var(--good);
  font-size: 0.85rem;
  min-height: 1.2em;
  margin: 8px 0 0;
}

#chart-wrap {
  position: relative;
}

#chart {
  width: 100%;
  height: auto;
  overflow: visible;
}

.chart-tooltip {
  position: absolute;
  pointer-events: none;
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 9px;
  font-size: 0.8rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.12);
  color: var(--text-primary);
  white-space: nowrap;
  transform: translate(-50%, -110%);
}

.empty-state {
  color: var(--text-muted);
  font-size: 0.9rem;
  text-align: center;
  padding: 24px 0;
  margin: 0;
}

.history-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.history-header h2 { margin: 0; }

.table-scroll {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

th, td {
  text-align: left;
  padding: 8px 10px;
  border-bottom: 1px solid var(--gridline);
  white-space: nowrap;
}

th {
  color: var(--text-secondary);
  font-weight: 600;
}

td { font-variant-numeric: tabular-nums; }

.app-footer {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8rem;
  margin-top: 24px;
}

@media (max-width: 380px) {
  .site-row {
    grid-template-columns: auto 1fr 80px;
  }
}