:root {
  --color-caffeine: #2563eb;
  --color-paraxanthine: #f59e0b;
  --color-effective: #ef4444;
  --color-bg: #f8fafc;
  --color-card: #ffffff;
  --color-border: #e2e8f0;
  --color-text: #1e293b;
  --color-text-secondary: #64748b;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
  padding: 1rem;
}

.container {
  max-width: 900px;
  margin: 0 auto;
}

header {
  text-align: center;
  margin-bottom: 1.5rem;
}

header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

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

/* Cards */
.card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1rem;
  box-shadow: var(--shadow);
}

.card h2 {
  font-size: 0.95rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--color-text-secondary);
  margin-bottom: 0.75rem;
}

/* Scenarios */
.charts-stack {
  margin-bottom: 1rem;
}

.scenario-controls {
  margin-bottom: 1rem;
}

.scenario-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.scenario-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text);
}

.scenario-remove {
  font-size: 1.2rem;
}

.scenario-add-btn {
  margin-bottom: 1rem;
}

/* Chart */
.chart-container {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 0.5rem;
  overflow: hidden;
}

.chart-stacked {
  border-top: none;
  border-top-left-radius: 0;
  border-top-right-radius: 0;
  box-shadow: none;
}

.chart-stacked + .chart-stacked,
.chart-container:has(+ .chart-stacked) {
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
}

.chart-scenario-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  padding: 0.25rem 0.5rem 0;
}

.chart-area {
  width: 100%;
  min-height: 350px;
}

/* Chart legend */
.chart-legend {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  padding: 0.4rem 0 0.2rem;
}

.chart-legend-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

.chart-legend-line {
  display: inline-block;
  width: 20px;
  border-top-width: 2px;
  border-top-style: solid;
}

.chart-legend-line-dashed {
  border-top-style: dashed;
}

/* Chart tooltip */
.chart-tooltip {
  position: absolute;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 0.4rem 0.6rem;
  font-size: 0.78rem;
  pointer-events: none;
  z-index: 10;
  box-shadow: var(--shadow);
  white-space: nowrap;
}

.chart-tooltip-time {
  font-weight: 600;
  margin-bottom: 0.2rem;
  color: var(--color-text);
}

.chart-tooltip-row {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

.chart-tooltip-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  display: inline-block;
}

/* Controls row */
.controls-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1rem;
}

/* Dose panel */
.dose-panel {
  min-height: 200px;
}

.dose-entry {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 0.5rem;
  flex-wrap: wrap;
}

.dose-entry select,
.dose-entry input[type="time"],
.dose-entry input[type="number"] {
  font-size: 0.85rem;
  padding: 0.35rem 0.5rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: var(--color-bg);
  color: var(--color-text);
}

.dose-entry select {
  flex: 1;
  min-width: 120px;
}

.dose-entry input[type="time"] {
  width: 120px;
}

.dose-entry input[type="number"] {
  width: 70px;
}

.dose-entry .dose-mg-label {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.btn-remove {
  background: none;
  border: none;
  color: var(--color-text-secondary);
  cursor: pointer;
  font-size: 1.1rem;
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  line-height: 1;
}

.btn-remove:hover {
  background: #fee2e2;
  color: #dc2626;
}

/* Buttons */
.btn {
  padding: 0.45rem 0.9rem;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
  transition: background 0.15s;
}

.btn-add {
  background: var(--color-primary);
  color: white;
  margin-top: 0.5rem;
}

.btn-add:hover {
  background: var(--color-primary-hover);
}

.btn-secondary {
  background: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  margin-top: 0.75rem;
}

.btn-secondary:hover {
  background: var(--color-border);
}

/* Summary */
.summary-panel .stat-row {
  display: flex;
  justify-content: space-between;
  padding: 0.35rem 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.85rem;
}

.summary-panel .stat-row:last-child {
  border-bottom: none;
}

.stat-label {
  color: var(--color-text-secondary);
}

.stat-value {
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.stat-section-title {
  font-size: 0.8rem;
  font-weight: 600;
  margin-top: 0.5rem;
  margin-bottom: 0.25rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.stat-section-title:first-child {
  margin-top: 0;
}

.stat-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
}

/* Slider */
.slider-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.slider-row input[type="range"] {
  flex: 1;
  cursor: pointer;
}

.slider-bound {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  white-space: nowrap;
}

/* Settings panel */
.settings-panel {
  margin-bottom: 1rem;
}

.settings-row {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
}

.setting-group {
  flex: 1;
  min-width: 200px;
}

.setting-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-bottom: 0.5rem;
}

/* Segmented control */
.segmented-control {
  display: inline-flex;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  overflow: hidden;
}

.seg-btn {
  padding: 0.4rem 1rem;
  border: none;
  background: var(--color-card);
  color: var(--color-text);
  font-size: 0.85rem;
  cursor: pointer;
  border-right: 1px solid var(--color-border);
  transition: background 0.15s, color 0.15s;
}

.seg-btn:last-child {
  border-right: none;
}

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

.seg-btn:hover:not(.active) {
  background: var(--color-bg);
}

/* Advanced panel */
#advanced-panel {
  margin-top: 1rem;
  border-top: 1px solid var(--color-border);
  padding-top: 0.75rem;
}

#advanced-panel summary {
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  user-select: none;
}

.advanced-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-top: 0.75rem;
}

.param-group h3 {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: 0.5rem;
}

.param-group label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  margin-bottom: 0.35rem;
  gap: 0.5rem;
}

.param-group input[type="number"] {
  width: 75px;
  padding: 0.3rem 0.4rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  font-size: 0.85rem;
  text-align: right;
  background: var(--color-bg);
  color: var(--color-text);
}

/* No doses message */
.no-doses {
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  font-style: italic;
  padding: 0.5rem 0;
}

/* Embed mode */
body.embed header,
body.embed .controls-row,
body.embed #advanced-panel,
body.embed #add-scenario,
body.embed .scenario-controls {
  display: none;
}

body.embed {
  padding: 0.25rem;
}

body.embed .charts-stack {
  margin-bottom: 0.5rem;
}

body.embed .chart-container {
  padding: 0.25rem;
}

body.embed .chart-area {
  min-height: 280px;
}

body.embed .chart-scenario-label {
  padding: 0.1rem 0.4rem 0;
}

body.embed .settings-panel {
  margin-bottom: 0;
  padding: 0.5rem;
}

body.embed #mode-group {
  display: none;
}

body.embed .settings-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

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

  .settings-row {
    flex-direction: column;
    gap: 1rem;
  }

  header h1 {
    font-size: 1.25rem;
  }
}