:root {
  color-scheme: light;
  --ink: #16202a;
  --muted: #617080;
  --line: #d7e0e8;
  --paper: #f6f8fb;
  --panel: #ffffff;
  --blue: #2468d8;
  --green: #148a62;
  --red: #c33d3d;
  --gold: #b27712;
  --shadow: 0 18px 48px rgba(29, 43, 62, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--paper);
  color: var(--ink);
}

button,
input {
  font: inherit;
}

.app-shell {
  width: min(1500px, 100%);
  margin: 0 auto;
  padding: 22px;
}

.workspace {
  min-height: calc(100vh - 44px);
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.eyebrow {
  margin: 0 0 5px;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: clamp(2rem, 4vw, 4.5rem);
  line-height: 0.95;
  letter-spacing: 0;
}

.formula-pill {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
  font-size: clamp(1rem, 1.7vw, 1.5rem);
  font-weight: 800;
  white-space: nowrap;
}

.equals {
  color: var(--blue);
}

.board-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(330px, 420px);
  gap: 18px;
  flex: 1;
  min-height: 0;
}

.graph-panel,
.control-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.graph-panel {
  min-height: 520px;
  padding: 18px;
  display: flex;
  flex-direction: column;
}

.graph-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: start;
}

.graph-head h2,
.control-panel h3 {
  margin-bottom: 6px;
}

.graph-head p {
  color: var(--muted);
  margin-bottom: 12px;
}

.icon-button {
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #eef4fb;
  color: var(--ink);
  cursor: pointer;
  font-size: 1.2rem;
}

canvas {
  width: 100%;
  height: 100%;
  min-height: 420px;
  border-radius: 8px;
  background: #fbfdff;
  border: 1px solid #e6edf4;
  touch-action: none;
}

.control-panel {
  padding: 16px;
  overflow: auto;
}

.tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
  margin-bottom: 16px;
}

.tab,
.scenario {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f2f6fa;
  color: var(--ink);
  padding: 10px 9px;
  cursor: pointer;
  font-weight: 750;
}

.tab.active,
.scenario.active {
  background: var(--blue);
  color: white;
  border-color: var(--blue);
}

.tab-panel {
  display: none;
}

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

.control-block {
  margin-bottom: 18px;
}

.control-block label {
  display: block;
  margin-bottom: 8px;
  font-weight: 800;
}

.control-line {
  display: grid;
  grid-template-columns: 1fr 82px;
  gap: 10px;
  align-items: center;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--blue);
}

output {
  text-align: right;
  font-weight: 850;
  color: var(--blue);
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin: 20px 0;
}

.result-grid div,
.mapping-box,
.calculation-box,
.story,
.glossary div {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfdff;
}

.result-grid div {
  padding: 12px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
}

.result-grid span {
  color: var(--muted);
}

.result-grid strong {
  text-align: right;
}

.status-message {
  margin: 0 0 14px;
  padding: 12px;
  border-radius: 8px;
  background: #ecf8f3;
  color: #0f684b;
  font-weight: 800;
}

.status-message.debt {
  background: #fff0f0;
  color: #9f2f2f;
}

.status-message.balance {
  background: #fff7e8;
  color: #85540e;
}

.bar-stack {
  display: grid;
  gap: 9px;
  margin-bottom: 16px;
}

.bar-row {
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr);
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 750;
}

.bar-track {
  height: 16px;
  border-radius: 999px;
  background: #e5edf4;
  overflow: hidden;
}

.bar-fill {
  width: 0%;
  height: 100%;
  border-radius: inherit;
  transition: width 180ms ease;
}

.bar-income {
  background: var(--blue);
}

.bar-consumption {
  background: var(--gold);
}

.bar-saving {
  background: var(--green);
}

.bar-debt {
  background: var(--red);
}

.mapping-box,
.calculation-box,
.story {
  padding: 14px;
}

.mapping-box p,
.calculation-box p,
.story p {
  margin-bottom: 8px;
  color: #2f3b48;
}

.math-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 68px;
  margin-right: 6px;
  padding: 3px 7px;
  border-radius: 6px;
  font-weight: 900;
  font-size: 0.82rem;
  font-variant-numeric: tabular-nums;
}

.badge-blue {
  background: #e9f1ff;
  color: var(--blue);
}

.badge-green {
  background: #e6f7ef;
  color: var(--green);
}

.badge-gold {
  background: #fff5df;
  color: #8a5a0b;
}

.badge-purple {
  background: #f1eaff;
  color: #6b45b8;
}

.calculation-box p {
  font-weight: 850;
  font-variant-numeric: tabular-nums;
}

.scenario-buttons {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
  margin-bottom: 14px;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 14px;
  font-size: 0.92rem;
}

th,
td {
  padding: 10px 8px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--muted);
  font-size: 0.8rem;
}

.glossary {
  display: grid;
  gap: 8px;
  margin: 0;
}

.glossary div {
  padding: 12px;
}

.glossary dt {
  font-weight: 850;
  margin-bottom: 4px;
}

.glossary dd {
  margin: 0;
  color: #3a4653;
}

.lesson-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-top: 18px;
}

.lesson-strip article {
  border-left: 4px solid var(--blue);
  padding: 4px 16px;
}

.lesson-strip h2 {
  font-size: 1rem;
  margin-bottom: 6px;
}

.lesson-strip p {
  color: #394756;
  margin-bottom: 0;
}

@media (max-width: 980px) {
  .topbar,
  .board-row {
    grid-template-columns: 1fr;
    display: grid;
  }

  .formula-pill {
    justify-content: center;
  }

  .lesson-strip {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 620px) {
  .app-shell {
    padding: 12px;
  }

  .board-row,
  .lesson-strip {
    grid-template-columns: 1fr;
  }

  .graph-panel {
    min-height: 430px;
    padding: 12px;
  }

  canvas {
    min-height: 330px;
  }

  .formula-pill {
    white-space: normal;
    width: 100%;
  }

  .control-line {
    grid-template-columns: 1fr;
  }

  .result-grid,
  .bar-row {
    grid-template-columns: 1fr;
  }

  output {
    text-align: left;
  }
}