* {
  box-sizing: border-box;
}

:root {
  --bg: oklch(97.8% 0.01 235);
  --panel: oklch(99.1% 0.004 235);
  --panel-strong: oklch(96.4% 0.01 235);
  --border: oklch(89.4% 0.012 235);
  --border-strong: oklch(82.8% 0.014 235);
  --ink: oklch(24% 0.02 255);
  --ink-soft: oklch(46% 0.02 255);
  --ink-muted: oklch(57% 0.02 255);
  --accent: oklch(58% 0.12 210);
  --accent-strong: oklch(48% 0.12 210);
  --accent-soft: oklch(94% 0.03 210);
  --observed: oklch(57% 0.16 250);
  --model: oklch(59% 0.13 165);
  --residual: oklch(66% 0.14 75);
  --zero: oklch(62% 0.02 255);
  --success: oklch(58% 0.11 160);
  --warning: oklch(66% 0.13 80);
  --shadow: 0 18px 42px -30px oklch(28% 0.03 235 / 0.45);
}

html {
  color-scheme: light;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, oklch(95.5% 0.03 210) 0, transparent 36%),
    radial-gradient(circle at top right, oklch(96% 0.02 165) 0, transparent 32%),
    var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  font-variant-numeric: tabular-nums;
}

h1, h2, h3, .preset-name {
  text-wrap: balance;
}

button,
input,
select,
textarea {
  font: inherit;
}

.topbar {
  padding: 22px 28px 18px;
  border-bottom: 1px solid var(--border);
}

.hero-copy {
  max-width: 76ch;
}

.topbar h1 {
  margin: 0;
  font-size: 2.2rem;
  line-height: 1.05;
  letter-spacing: -0.04em;
}

.lede {
  margin: 12px 0 0;
  max-width: 68ch;
  color: var(--ink-soft);
  font-size: 1rem;
}

.section-label,
.control-group legend,
.kpi-card span {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-muted);
}

.layout {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr) 420px;
  gap: 20px;
  padding: 20px 28px 26px;
  width: 100%;
  max-width: none;
  margin: 0;
}

.workspace {
  min-width: 0;
}

.panel {
  min-width: 0;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 22px;
  box-shadow: var(--shadow);
}

.controls,
.summary {
  position: sticky;
  top: 18px;
  align-self: start;
  max-height: calc(100vh - 36px);
  overflow: auto;
}

.panel-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.panel-head h2 {
  margin: 0;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}

.panel-head p {
  margin: 4px 0 0;
  color: var(--ink-soft);
  font-size: 0.92rem;
  max-width: 58ch;
}

.control-group {
  border: 0;
  margin: 0 0 18px;
  padding: 0;
}

.control-group--preset {
  border-top: 1px solid var(--border);
  padding-top: 16px;
}

.control-group legend {
  margin: 0 0 8px;
  padding: 0;
}

.controls label {
  display: block;
  color: var(--ink);
  font-size: 0.92rem;
}

.hint {
  color: var(--ink-muted);
  font-size: 0.75rem;
}

.controls input[type="number"],
.controls select {
  width: 100%;
  margin-top: 5px;
  padding: 9px 11px;
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  background: var(--panel-strong);
  color: var(--ink);
  transition: border-color 160ms ease, box-shadow 160ms ease, background-color 160ms ease;
}

.controls input[type="number"]:focus,
.controls select:focus,
.controls input[type="range"]:focus-visible {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.param-full {
  margin-bottom: 10px;
}

.param-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 12px;
}

.slider-wrapper {
  display: flex;
  gap: 12px;
  align-items: center;
}

.controls input[type="range"] {
  flex: 1;
  appearance: none;
  -webkit-appearance: none;
  height: 6px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent) 0%, var(--border-strong) 100%);
  cursor: pointer;
  margin: 8px 0;
}

.controls input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--panel);
  border: 3px solid var(--accent);
  box-shadow: 0 4px 10px oklch(30% 0.03 235 / 0.18);
}

.controls input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--panel);
  border: 3px solid var(--accent);
  box-shadow: 0 4px 10px oklch(30% 0.03 235 / 0.18);
}

.slider-value {
  min-width: 56px;
  text-align: right;
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent-strong);
}

.slider-bounds {
  display: flex;
  justify-content: space-between;
  margin-top: 2px;
  color: var(--ink-muted);
  font-size: 0.74rem;
}

.switch-label {
  display: flex !important;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  user-select: none;
}

.switch-label input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.switch {
  width: 38px;
  height: 22px;
  border-radius: 999px;
  background: var(--border-strong);
  position: relative;
  flex-shrink: 0;
  transition: background-color 160ms ease;
}

.switch::after {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--panel);
  box-shadow: 0 2px 4px oklch(24% 0.03 235 / 0.2);
  transition: transform 160ms ease;
}

.switch-label input:checked + .switch {
  background: var(--accent);
}

.switch-label input:checked + .switch::after {
  transform: translateX(16px);
}

.switch-label input:focus-visible + .switch {
  outline: none;
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.info-panel {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.info-panel h3 {
  margin: 0 0 10px;
  font-size: 0.95rem;
}

.info-panel details {
  margin: 0 0 8px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--panel-strong);
  overflow: clip;
}

.info-panel summary {
  cursor: pointer;
  padding: 12px 14px;
  color: var(--ink);
  font-size: 0.92rem;
  font-weight: 650;
  user-select: none;
}

.info-panel p {
  margin: 0;
  padding: 0 14px 12px;
  color: var(--ink-soft);
  font-size: 0.88rem;
}

.info-panel p + p {
  padding-top: 0;
}

.info-panel p code {
  font-size: 0.85em;
  padding: 1px 4px;
  border-radius: 5px;
  background: var(--panel);
  border: 1px solid var(--border);
}

.info-panel p.caveat {
  color: var(--ink-muted);
  font-style: italic;
  border-left: 2px solid var(--border);
  margin: 0 14px 12px;
  padding: 0 0 0 10px;
}


.control-note {
  margin: 8px 0 0;
  color: var(--ink-muted);
  font-size: 0.82rem;
  line-height: 1.45;
}

.source-link {
  display: inline-block;
  margin-top: 6px;
  color: var(--accent-strong);
  font-size: 0.78rem;
  font-weight: 650;
  text-decoration: none;
}

.source-link:hover,
.source-link:focus-visible {
  text-decoration: underline;
}

.info-tip {
  display: inline-grid;
  place-items: center;
  width: 1.05rem;
  height: 1.05rem;
  margin-left: 3px;
  border: 1px solid var(--accent);
  border-radius: 50%;
  color: var(--accent-strong);
  font-size: 0.7rem;
  font-weight: 800;
  cursor: help;
}

.charts {
  padding: 22px;
}

.signal-strip {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--panel-strong);
}

.signal-strip p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 10px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid transparent;
}

.status-pill.overshoot {
  background: oklch(95% 0.03 75);
  color: oklch(48% 0.12 60);
  border-color: oklch(88% 0.05 75);
}

#stateCard.overshoot {
  background: oklch(95% 0.03 75);
  border-color: oklch(88% 0.05 75);
}

#stateCard.overshoot strong {
  color: oklch(48% 0.12 60);
}

.status-pill.underestimate {
  background: oklch(94% 0.03 160);
  color: oklch(42% 0.12 160);
  border-color: oklch(88% 0.04 160);
}

#stateCard.underestimate {
  background: oklch(94% 0.03 160);
  border-color: oklch(88% 0.04 160);
}

#stateCard.underestimate strong {
  color: oklch(42% 0.12 160);
}

.status-pill.matched {
  background: oklch(95% 0.02 235);
  color: var(--ink-soft);
  border-color: var(--border);
}

#stateCard.matched {
  background: oklch(95% 0.02 235);
  border-color: var(--border);
}

#stateCard.matched strong {
  color: var(--ink-soft);
}

.chart-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.chart {
  min-width: 0;
}

.chart--main {
  grid-column: 1 / -1;
}

.chart h3 {
  margin: 0 0 10px;
  font-size: 0.98rem;
}

.chart-box {
  position: relative;
  height: 270px;
  background: linear-gradient(180deg, var(--panel) 0%, var(--panel-strong) 100%);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 12px;
}

.chart-box--large {
  height: 360px;
}

.chart-footnotes {
  margin: 12px 4px 0;
  padding-left: 20px;
}

.chart-footnote {
  margin: 8px 0 0;
  color: var(--ink-muted);
  font-size: 0.78rem;
  line-height: 1.55;
}

.chart-footnote a {
  color: var(--accent-strong);
  font-weight: 650;
}

.kpi-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.kpi-card {
  display: grid;
  gap: 6px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--panel-strong);
}

.kpi-card strong,
.kpi-value {
  display: block;
  font-size: 1.15rem;
  line-height: 1.1;
  color: var(--ink);
}

.section-label {
  margin-bottom: 8px;
}

.insight-card,
.parameters-card {
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--panel-strong);
  margin-bottom: 14px;
}

.insight-card p {
  margin: 0;
  color: var(--ink);
}

.insight-card ul {
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.insight-card li {
  padding: 10px 12px;
  border-radius: 14px;
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--ink-soft);
  font-size: 0.88rem;
}

.preset-name {
  margin-bottom: 12px;
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--ink);
}

.param-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 14px;
  margin: 0;
}

.param-list dt,
.param-list dd {
  margin: 0;
}

.param-list dt {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-muted);
}

.param-list dd {
  color: var(--ink);
  font-size: 0.95rem;
  font-weight: 600;
}

.periods table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
}

.periods thead th {
  text-align: left;
  padding: 10px 8px 8px;
  border-bottom: 1px solid var(--border-strong);
  color: var(--ink-muted);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.periods tbody td {
  padding: 10px 8px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.periods tbody tr:last-child td {
  border-bottom: none;
}

.period-label {
  font-weight: 700;
  color: var(--ink);
}

.period-signal {
  display: inline-flex;
  align-items: center;
  padding: 4px 8px;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border: 1px solid transparent;
}

.period-signal.overshoot {
  background: oklch(95% 0.03 75);
  color: oklch(48% 0.12 60);
  border-color: oklch(88% 0.05 75);
}

.period-signal.underestimate {
  background: oklch(94% 0.03 160);
  color: oklch(42% 0.12 160);
  border-color: oklch(88% 0.04 160);
}

.footer {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  padding: 18px 28px 24px;
  color: var(--ink-muted);
  border-top: 1px solid var(--border);
}

.footer a {
  color: var(--accent-strong);
  font-weight: 650;
  text-decoration: none;
}

.footer a:hover {
  text-decoration: underline;
}

.footer-attribution {
  flex-basis: 100%;
  margin: 0;
  font-size: 0.78rem;
  line-height: 1.5;
}

@media (max-width: 1400px) {
  .topbar {
    grid-template-columns: 1fr;
  }

  .layout {
    grid-template-columns: 280px minmax(0, 1fr);
  }

  .summary {
    grid-column: 1 / -1;
    position: static;
    max-height: none;
  }
}

@media (max-width: 1100px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .controls,
  .summary {
    position: static;
    max-height: none;
  }

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

  .chart--main {
    grid-column: auto;
  }
}

@media (max-width: 720px) {
  .topbar,
  .layout,
  .footer {
    padding-left: 16px;
    padding-right: 16px;
  }

  .kpi-grid,
  .param-list {
    grid-template-columns: 1fr;
  }

  .topbar h1 {
    font-size: 1.8rem;
  }

  .chart-box {
    height: 240px;
  }

  .chart-box--large {
    height: 300px;
  }
}

/* methodology.html */
.doc {
  max-width: 92ch;
  margin: 0 auto;
  padding: 24px 28px 8px;
}

.doc-block {
  margin-bottom: 26px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--panel);
  padding: 22px 24px;
  box-shadow: var(--shadow);
}

.doc-block h2 {
  margin: 0 0 12px;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.doc-block p {
  margin: 0 0 12px;
  color: var(--ink-soft);
  font-size: 0.9rem;
  line-height: 1.6;
}

.doc-block p:last-child {
  margin-bottom: 0;
}

.doc-block a {
  color: var(--accent-strong);
  font-weight: 620;
}

.doc-formula {
  padding: 10px 12px;
  border-radius: 10px;
  background: var(--panel-strong);
  text-align: center;
}

.doc-table {
  width: 100%;
  margin: 0 0 14px;
  border-collapse: collapse;
  font-size: 0.83rem;
}

.doc-table th,
.doc-table td {
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
  color: var(--ink-soft);
}

.doc-table th {
  color: var(--ink);
  font-weight: 700;
  white-space: nowrap;
}

.doc-list {
  margin: 0;
  padding-left: 20px;
  color: var(--ink-soft);
  font-size: 0.88rem;
  line-height: 1.6;
}

.doc-list li {
  margin-bottom: 6px;
}

@media (max-width: 720px) {
  .doc-block {
    overflow-x: auto;
  }
}