:root {
  --bg: #f6f8fc;
  --surface: #ffffff;
  --surface2: #f8fafc;
  --text: #0f172a;
  --muted: #475569;
  --border: rgba(15, 23, 42, 0.12);
  --accent: #2563eb;
  --accent2: #16a34a;
  --danger: #dc2626;
  --shadow: 0 10px 28px rgba(15, 23, 42, 0.08);
  --radius: 14px;
  --radius-sm: 12px;

  --chart-area: #ffffff;
  --chart-border: rgba(15, 23, 42, 0.12);
  --chart-grid: rgba(15, 23, 42, 0.08);
  --chart-text: rgba(15, 23, 42, 0.7);
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
  background: linear-gradient(180deg, #fbfcff 0%, var(--bg) 60%, #f2f6ff 100%);
  color: var(--text);
  height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

code,
.mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

code {
  font-size: 0.95em;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
}

.title .appname {
  font-weight: 750;
  letter-spacing: -0.2px;
}

.title .subtitle {
  color: var(--muted);
  font-size: 12px;
  margin-top: 2px;
}

.tabs {
  display: flex;
  gap: 8px;
}

.tab {
  appearance: none;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.7);
  color: var(--text);
  padding: 9px 12px;
  border-radius: 999px;
  cursor: pointer;
}

.tab.is-active {
  border-color: rgba(37, 99, 235, 0.35);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.layout {
  flex: 1 1 auto;
  min-height: 0;
}

.view {
  display: none;
  height: 100%;
  padding: 18px;
  overflow: auto;
}

.view.is-active {
  display: block;
}

.panel {
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 18px;
  box-shadow: var(--shadow);
}

.panel.tight {
  padding: 14px 14px;
}

.panelHeader {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
}

.panelHeaderRight {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.chartCanvas {
  height: 320px;
}

.chartActionsRow {
  flex-wrap: wrap;
  align-items: flex-start;
}

.chartActionBtn {
  flex: 0 0 170px;
}

#profit-caption {
  flex: 1 1 auto;
  min-width: 220px;
}

.modalBackdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.22);
  backdrop-filter: blur(6px);
  z-index: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 18px;
}

.modalBackdrop.is-hidden {
  display: none;
}

.modalShell {
  width: min(1280px, 96vw);
  height: min(860px, calc(100vh - 80px));
  min-height: 520px;
  max-height: calc(100vh - 80px);
  display: flex;
  align-items: stretch;
  justify-content: stretch;
}

.modalContent {
  width: 100%;
  height: 100%;
  display: flex;
}

.analyticsPanel.is-focus {
  max-width: none;
  width: 100%;
  height: 100%;
  margin: 0;
  display: flex;
  flex-direction: column;
}

.analyticsPanel.is-focus .chartCanvas {
  height: min(64vh, 660px);
}

h1,
h2,
h3 {
  margin: 0 0 10px;
}

h1 {
  font-size: 22px;
  letter-spacing: -0.2px;
}

h2 {
  font-size: 16px;
}

p {
  line-height: 1.55;
  color: rgba(15, 23, 42, 0.92);
}

ul {
  margin: 10px 0;
  padding-left: 18px;
}

.muted {
  color: var(--muted);
}

.small {
  font-size: 12px;
}

.row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 12px;
}

button {
  appearance: none;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.9);
  color: var(--text);
  padding: 10px 12px;
  border-radius: 12px;
  cursor: pointer;
}

button.primary {
  border-color: rgba(37, 99, 235, 0.35);
  background: rgba(37, 99, 235, 0.08);
}

.iconBtn {
  width: 38px;
  height: 38px;
  padding: 0;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-color: rgba(37, 99, 235, 0.22);
  background: rgba(37, 99, 235, 0.05);
}

.iconBtn:hover {
  background: rgba(37, 99, 235, 0.08);
}

.iconBtn:focus-visible {
  outline: 2px solid rgba(37, 99, 235, 0.55);
  outline-offset: 2px;
}

.icon {
  width: 18px;
  height: 18px;
  display: block;
}

.iconBtn .icon-collapse {
  display: none;
}

.iconBtn.is-on .icon-expand {
  display: none;
}

.iconBtn.is-on .icon-collapse {
  display: block;
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.callout {
  border: 1px solid rgba(22, 163, 74, 0.25);
  background: rgba(22, 163, 74, 0.06);
  border-radius: var(--radius);
  padding: 12px 12px;
}

.callout-title {
  font-weight: 700;
  margin-bottom: 4px;
}

.formula {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 12px;
  overflow: auto;
}

.sim {
  display: grid;
  grid-template-columns: minmax(520px, 1fr) 420px;
  gap: 14px;
  height: 100%;
}

.maincol {
  display: flex;
  flex-direction: column;
  gap: 12px;
  overflow: auto;
  padding-right: 4px;
}

canvas {
  width: 100%;
  height: auto;
  display: block;
}

.kpis {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.kpi {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 10px;
  background: var(--surface2);
}

.kpiLabel {
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.2px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.kpiValue {
  margin-top: 4px;
  font-size: 13px;
  color: var(--text);
  font-weight: 700;
}

.kpiValue.good {
  color: var(--accent2);
}

.kpiValue.bad {
  color: var(--danger);
}

.progressRow {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 12px;
}

progress {
  width: 260px;
  height: 10px;
  border-radius: 999px;
  overflow: hidden;
}

.seg {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface2);
  padding: 3px;
  gap: 3px;
}

.segBtn {
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--muted);
}

.segBtn.is-active {
  border-color: rgba(37, 99, 235, 0.28);
  background: rgba(37, 99, 235, 0.08);
  color: var(--text);
}

.chartView {
  display: none;
}

.chartView.is-active {
  display: block;
}

.labelRow {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.help {
  width: 18px;
  height: 18px;
  padding: 0;
  border-radius: 999px;
  font-size: 12px;
  line-height: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(15, 23, 42, 0.18);
  background: rgba(255, 255, 255, 0.95);
  color: rgba(15, 23, 42, 0.75);
}

.help:focus-visible {
  outline: 2px solid rgba(37, 99, 235, 0.6);
  outline-offset: 2px;
}

.help[data-tooltip] {
  position: relative;
}

.tt {
  position: relative;
}

/* Tooltips are rendered via a fixed-position portal (JS) to avoid clipping by scroll containers. */
.tooltipPortal {
  position: fixed;
  left: 0;
  top: 0;
  max-width: min(380px, 88vw);
  background: rgba(255, 255, 255, 0.98);
  border: 1px solid rgba(15, 23, 42, 0.14);
  border-radius: 12px;
  padding: 10px 10px;
  color: rgba(15, 23, 42, 0.92);
  font-size: 12px;
  line-height: 1.35;
  box-shadow: 0 18px 60px rgba(15, 23, 42, 0.18);
  pointer-events: none;
  z-index: 1000;
  opacity: 0;
  transform: translateY(-2px);
  transition: opacity 80ms ease-out, transform 80ms ease-out;
}

.tooltipPortal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

select {
  width: 100%;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.95);
  color: var(--text);
  border-radius: 12px;
  padding: 10px 10px;
}

select:focus-visible {
  outline: 2px solid rgba(37, 99, 235, 0.6);
  outline-offset: 2px;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 8px;
  border-radius: 999px;
  border: 1px solid rgba(15, 23, 42, 0.14);
  background: rgba(255, 255, 255, 0.95);
  font-size: 12px;
  font-weight: 700;
}

.badge.good {
  border-color: rgba(22, 163, 74, 0.28);
  color: var(--accent2);
}

.badge.bad {
  border-color: rgba(220, 38, 38, 0.28);
  color: var(--danger);
}

/* Tutorial layout */
.tutorialHeader {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 12px;
}

.tutorialProgress {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
}

.tutorialStepCount {
  color: var(--muted);
  font-size: 12px;
}

.tutorialDots {
  display: flex;
  gap: 6px;
}

.tutorialDots .dot {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  border: 1px solid rgba(15, 23, 42, 0.2);
  background: rgba(15, 23, 42, 0.06);
}

.tutorialDots .dot.is-active {
  background: rgba(37, 99, 235, 0.65);
  border-color: rgba(37, 99, 235, 0.65);
}

.tutorialBody {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 14px;
}

.tutorialNavList {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.stepLink {
  text-align: left;
  border-radius: 12px;
  padding: 10px 10px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.9);
  color: rgba(15, 23, 42, 0.9);
}

.stepLink.is-active {
  border-color: rgba(37, 99, 235, 0.28);
  background: rgba(37, 99, 235, 0.07);
}

.tutorialStage {
  display: none;
}

.tutorialStage.is-active {
  display: block;
}

.tutCard {
  margin-top: 12px;
  border: 1px solid var(--border);
  background: var(--surface2);
  border-radius: var(--radius);
  padding: 12px 12px;
}

.tutCardTitle {
  font-weight: 750;
  color: rgba(15, 23, 42, 0.92);
  margin-bottom: 8px;
}

.grid2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 14px;
}

.tutResult {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 14px;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
}

.tutorialFooter {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  gap: 10px;
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 420px;
  min-width: 420px;
  max-width: 420px;
  overflow-x: hidden;
  overflow-y: auto;
  padding-right: 4px;
}

.field {
  margin-top: 10px;
}

.field label {
  display: block;
  font-size: 13px;
  color: rgba(15, 23, 42, 0.92);
  margin-bottom: 6px;
}

.fieldRow {
  display: flex;
  align-items: center;
  gap: 10px;
}

input[type="range"] {
  width: 100%;
  min-width: 0;
}

output {
  min-width: 74px;
  flex: 0 0 86px;
  white-space: nowrap;
  text-align: right;
  color: var(--muted);
  font-size: 12px;
}

.check {
  display: flex;
  align-items: center;
  gap: 10px;
  color: rgba(15, 23, 42, 0.92);
  font-size: 13px;
  user-select: none;
}

details.advanced {
  margin-top: 10px;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 10px;
  background: var(--surface2);
}

details.advanced > summary {
  cursor: pointer;
  color: rgba(15, 23, 42, 0.92);
  font-weight: 650;
}

details.math {
  margin-top: 10px;
  border: 1px dashed rgba(15, 23, 42, 0.18);
  border-radius: 12px;
  padding: 10px 10px;
  background: rgba(255, 255, 255, 0.65);
}

details.math > summary {
  cursor: pointer;
  font-weight: 650;
  color: rgba(15, 23, 42, 0.92);
}

.footer {
  flex: 0 0 auto;
  border-top: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  padding: 10px 18px;
}

.footerInner {
  max-width: 1100px;
  margin: 0 auto;
  font-size: 12px;
  color: var(--muted);
  text-align: center;
}

.footerLink {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 2px;
}

@media (max-width: 1040px) {
  .sim {
    grid-template-columns: 1fr;
  }

  .sidebar {
    width: auto;
    min-width: 0;
    max-width: none;
    padding-right: 0;
  }

  .kpis {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .tutorialNavList {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .grid2 {
    grid-template-columns: 1fr;
  }

  .chartCanvas {
    height: 300px;
  }

  .modalShell {
    width: 96vw;
    height: calc(100vh - 120px);
    min-height: 420px;
  }

  .analyticsPanel.is-focus .chartCanvas {
    height: min(56vh, 520px);
  }
}

@media (min-width: 1200px) {
  .kpis {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}