/* An open notebook: dark panels, electric blue, and one chart visitors can manipulate. */
.market-lab { display: block; margin-top: 95px; }
.market-intro { display: grid; grid-template-columns: 1fr 1fr; align-items: start; gap: 8%; margin-bottom: 40px; }
.market-intro h3 { font-size: clamp(46px,5vw,70px); margin: 0; }
.market-intro .eyebrow { margin-bottom: 24px; }
.market-intro-copy { padding-top: 34px; }
.market-intro-copy>p { font-size: 14px; line-height: 1.9; color: var(--muted); max-width: 490px; margin-bottom: 14px; }
.market-intro-copy .inline-link { font-size: 14px; margin-top: 5px; }
.market-achievement { display: flex; align-items: center; gap: 16px; margin-top: 30px; max-width: 490px; }
.achievement-icon { flex: 0 0 36px; width: 36px; height: 36px; color: var(--accent); }
.market-achievement .achievement-result { display: block; font: 600 22px/1.3 var(--display); letter-spacing: -.02em; color: var(--ink); }
.achievement-event { margin: 5px 0 0; font: 16px/1.6 var(--body); color: var(--muted); }
.achievement-event span { white-space: nowrap; }
.market-tabs { display: none; border-bottom: 1px solid var(--line); gap: 30px; }
.math-ready .market-tabs { display: flex; }
.market-tabs button { padding: 18px 0; font-size: 15px; border-bottom: 3px solid transparent; margin-bottom: -1px; }
.market-tabs button span { margin-right: 13px; font: 14px var(--mono); color: var(--muted); }
.market-tabs [aria-selected=true] { border-color: var(--dark); color: var(--dark); }
.market-panel[hidden] { display: none; }
.math-instrument { display: grid; grid-template-columns: 265px minmax(0,1fr); background: var(--surface); border-bottom: 1px solid var(--line); }
.math-controls { padding: 32px 24px 28px; border-right: 1px solid var(--line); }
.math-caption { color: var(--blue-ink); font-size: 14px; margin-bottom: 17px; }
.math-controls h4 { font-size: 32px; letter-spacing: -.035em; color: var(--dark); }
.math-control-intro { color: var(--muted); font-size: 14px; line-height: 1.8; margin-top: 14px; }
.math-kind { display: flex; gap: 4px; border-bottom: 1px solid var(--line); margin-top: 24px; }
.math-kind button { font-size: 14px; padding: 10px 20px; border-bottom: 2px solid transparent; }
.math-kind [aria-pressed=true] { color: var(--dark); border-color: var(--dark); }
.math-kind-help { font-size: 14px; color: var(--muted); margin: 11px 0 22px; }
.math-slider { margin-bottom: 22px; }
.math-slider label { display: flex; justify-content: space-between; align-items: center; gap: 8px; font-size: 14px; }
.math-slider output { font: 14px var(--mono); color: var(--dark); white-space: nowrap; }
.math-slider input[type=range] { width: 100%; margin: 14px 0 0; accent-color: var(--dark); cursor: ew-resize; }
.math-range-label { display: flex; justify-content: space-between; font: 14px var(--mono); letter-spacing: .06em; color: var(--muted); margin-top: 7px; }
.math-presets { display: flex; flex-wrap: wrap; gap: 7px; margin: 28px 0 20px; }
.math-presets button { font-size: 14px; padding: 7px 10px; border: 1px solid var(--line); border-radius: 3px; }
.math-presets button:hover,.math-presets [aria-pressed=true] { background: var(--surface-raised); border-color: var(--dark); color: var(--dark); }
.math-resample { width: 100%; display: flex; justify-content: space-between; padding: 14px 17px; background: var(--action); color: white; font-size: 14px; }
.math-resample:hover { background: var(--action-hover); }
.math-resample span { font-size: 18px; line-height: 1; }
.math-seed-note { font-size: 14px; color: var(--muted); line-height: 1.8; margin-top: 12px; }
.math-view { min-width: 0; padding: 32px 24px 25px 30px; }
.math-view-heading { display: flex; justify-content: space-between; align-items: start; gap: 15px; }
.math-view-heading p { font-size: 14px; color: var(--blue-ink); }
.math-view-heading h5 { font: 500 20px/1.3 var(--display); letter-spacing: -.025em; margin: 10px 0 0; }
.math-run { font-size: 14px; color: var(--muted); white-space: nowrap; margin-top: 2px; }
.model-chart { display: block; width: 100%; height: auto; margin-top: 20px; overflow: visible; }
#model-grid path { stroke: var(--line); stroke-width: 1; fill: none; }
#model-axis text { font: 14px var(--mono); fill: var(--muted); }
.model-band { fill: var(--dark); opacity: .28; }
.model-path { fill: none; stroke: var(--dark); stroke-width: 1.15; opacity: .24; }
.model-path.is-highlighted { stroke: var(--accent); stroke-width: 2.4; opacity: .95; }
.model-strike-line { stroke: var(--accent); stroke-width: 1.2; stroke-dasharray: 5 5; fill: none; }
.model-strike-label { font: 14px var(--mono); fill: var(--accent); paint-order: stroke; stroke: var(--surface); stroke-width: 5px; }
#model-start { fill: var(--dark); stroke: var(--surface); stroke-width: 2; }
.model-legend { display: flex; flex-wrap: wrap; gap: 14px; font-size: 14px; color: var(--muted); margin: 5px 0 12px; }
.model-legend>span { display: flex; gap: 6px; align-items: center; }
.model-legend i { display: inline-block; width: 16px; height: 0; }
.legend-path { border-top: 2px solid var(--dark); }
.model-legend .legend-band { height: 9px; background: var(--line); }
.legend-strike { border-top: 1px dashed var(--accent); }
.model-scope { font-size: 14px; color: var(--muted); line-height: 1.7; }
.model-prices { display: grid; grid-template-columns: 1fr 1fr 1.3fr; gap: 20px; border-top: 1px solid var(--line); padding-top: 22px; margin-top: 25px; }
.model-prices .mono { display: block; font-size: 14px; color: var(--muted); letter-spacing: .045em; }
.model-prices output { display: block; color: var(--dark); font: 500 clamp(28px,3.1vw,43px)/1.35 var(--display); letter-spacing: -.045em; font-variant-numeric: tabular-nums; }
.model-prices small,.model-greeks small { display: block; font-size: 14px; color: var(--muted); line-height: 1.7; }
.model-interval strong { display: block; font: 500 20px/1.4 var(--display); color: var(--dark); margin: 12px 0 4px; font-variant-numeric: tabular-nums; }
.model-greeks { display: grid; grid-template-columns: 1fr 1fr 1.3fr; gap: 20px; border-top: 1px solid var(--line); padding-top: 22px; margin-top: 22px; }
.model-greeks span { display: block; font-size: 14px; }
.model-greeks strong { display: block; font: 500 23px/1.5 var(--display); color: var(--dark); font-variant-numeric: tabular-nums; margin: 4px 0; }
.math-connection { display: grid; grid-template-columns: 265px 1fr; padding: 29px 0; border-bottom: 1px solid var(--line); }
.math-lesson-tabs { display: flex; flex-direction: column; align-items: flex-start; gap: 13px; padding-right: 24px; }
.math-lesson-tabs button { font-size: 14px; padding: 6px 0; border-bottom: 1px solid transparent; color: var(--muted); text-align: left; }
.math-lesson-tabs [aria-pressed=true] { color: var(--dark); border-color: var(--dark); }
.math-lesson { padding-left: 30px; }
.math-lesson>.mono { font-size: 14px; color: var(--blue-ink); margin-bottom: 13px; }
.math-lesson h4 { font-size: 24px; margin-bottom: 12px; letter-spacing: -.025em; }
.math-lesson>p:not(.mono):not(.math-formula) { font-size: 14px; line-height: 1.9; color: var(--muted); max-width: 650px; }
.math-formula { font: italic 25px/1.5 var(--serif); color: var(--dark); margin-top: 17px; overflow-wrap: anywhere; }
.model-notebook summary { display: flex; align-items: center; justify-content: space-between; padding: 19px 0; font-size: 14px; cursor: pointer; list-style: none; }
.model-notebook summary::-webkit-details-marker { display: none; }
.model-notebook summary span { font-size: 22px; }
.model-notebook[open] summary span { transform: rotate(45deg); }
.model-notebook-body { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; padding: 16px 0 30px; }
.model-notebook h4 { font-size: 22px; margin-bottom: 18px; }
.model-notebook-body p { font-size: 14px; line-height: 1.9; color: var(--muted); margin-bottom: 15px; }
.model-notebook-body .math-equation { color: var(--dark); font: 15px/1.8 var(--serif); overflow-wrap: anywhere; }
.model-sources a { display: block; color: var(--dark); text-decoration: underline; text-underline-offset: 4px; margin-top: 8px; }
.math-assumptions { border-top: 1px solid var(--line); padding-top: 15px; color: var(--muted); font-size: 14px; line-height: 1.8; }
.strategy-experiment { display: grid; grid-template-columns: .75fr 1.3fr; align-items: start; gap: 7%; padding-top: 30px; }
.strategy-intro { padding-top: 18px; }
.strategy-intro .mono { font-size: 14px; color: var(--blue-ink); margin-bottom: 20px; }
.strategy-intro h4 { font-size: 42px; margin-bottom: 25px; }
.strategy-intro>p:not(.mono) { font-size: 14px; color: var(--muted); line-height: 1.9; margin-top: 18px; }
.strategy-intro .strategy-fixed { font-size: 14px !important; border-top: 1px solid var(--line); padding-top: 18px; }
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; clip-path: inset(50%); overflow: hidden; white-space: nowrap; border: 0; }
@media (max-width:1100px) {
  .math-instrument,.math-connection { grid-template-columns: 230px minmax(0,1fr); }
  .math-controls { padding-right: 23px; }
  .math-view,.math-lesson { padding-left: 23px; }
  .model-prices,.model-greeks { gap: 14px; }
  .model-prices { grid-template-columns: 1fr 1fr; }
  .model-interval { grid-column: 1/-1; display: flex; flex-wrap: wrap; align-items: center; gap: 7px 16px; }
  .model-interval strong { margin: 0; font-size: 18px; }
  .model-greeks { grid-template-columns: 1fr 1fr 1fr; }
}
@media (max-width:800px) {
  .market-lab { margin-top: 65px; }
  .market-intro { gap: 30px; }
  .market-intro h3 { font-size: 49px; }
  .market-intro-copy { padding-top: 0; }
  .market-intro-copy>p { font-size: 14px; }
  .math-instrument { grid-template-columns: 1fr; }
  .math-controls { display: grid; grid-template-columns: 1fr 1fr; gap: 0 30px; padding: 28px 22px; border-right: 0; border-bottom: 1px solid var(--line); }
  .math-caption,.math-controls h4,.math-control-intro,.math-kind,.math-kind-help { grid-column: 1; }
  .math-controls h4 { font-size: 31px; }
  .math-kind { margin-top: 19px; }
  .math-kind-help { margin-bottom: 0; }
  .math-slider { grid-column: 2; }
  .math-slider:nth-of-type(2) { grid-row: 1/3; }
  .math-slider:nth-of-type(3) { grid-row: 3/5; }
  .math-slider:nth-of-type(4) { grid-row: 5/7; }
  .math-presets { grid-column: 1/-1; margin-top: 23px; }
  .math-resample { grid-column: 1; align-self: start; }
  .math-seed-note { grid-column: 2; margin: 0; }
  .math-view { padding: 26px 22px; }
  .math-connection { grid-template-columns: 190px 1fr; }
  .math-lesson { padding-left: 20px; }
  .model-greeks small { font-size: 14px; }
  .strategy-experiment { grid-template-columns: 1fr; gap: 30px; }
  .strategy-intro h4 br { display: none; }
}
@media (max-width:600px) {
  .market-intro { display: block; margin-bottom: 25px; }
  .market-intro h3 { font-size: 55px; margin-bottom: 25px; }
  .market-intro-copy>p { font-size: 14px; }
  .market-tabs { gap: 22px; }
  .market-tabs button { font-size: 14px; }
  .market-tabs button span { font-size: 14px; margin-right: 7px; }
  .math-instrument { margin-inline: -6px; }
  .math-controls { padding: 26px 16px; gap: 0 22px; }
  .math-controls h4 { font-size: 28px; }
  .math-control-intro { font-size: 14px; }
  .math-slider label { font-size: 14px; flex-wrap: wrap; gap: 5px; }
  .math-slider output { font-size: 14px; }
  .math-slider { margin-bottom: 20px; }
  .math-kind button { padding: 8px 15px; }
  .math-kind-help { font-size: 14px; line-height: 1.7; }
  .math-presets { gap: 6px; }
  .math-presets button { font-size: 14px; padding: 7px 9px; }
  .math-resample { font-size: 14px; padding: 13px; }
  .math-seed-note { font-size: 14px; }
  .math-view { padding: 25px 16px; }
  .math-view-heading h5 { font-size: 18px; max-width: 230px; }
  .math-view-heading p,.math-run { font-size: 14px; }
  .model-chart { margin-top: 20px; }
  #model-axis text { font-size: 22px; }
  .model-strike-label { font-size: 20px; }
  .model-legend { gap: 9px 13px; font-size: 14px; margin-top: 12px; }
  .model-scope { font-size: 14px; }
  .model-prices output { font-size: 39px; }
  .model-prices .mono { font-size: 14px; }
  .model-interval { display: block; }
  .model-interval strong { margin: 6px 0 3px; }
  .model-greeks { gap: 13px; }
  .model-greeks span { font-size: 14px; line-height: 1.5; min-height: 30px; }
  .model-greeks strong { font-size: 21px; }
  .model-greeks small { font-size: 14px; }
  .math-connection { grid-template-columns: 1fr; padding: 25px 0; gap: 25px; }
  .math-lesson-tabs { flex-direction: row; gap: 15px; padding: 0; }
  .math-lesson-tabs button { font-size: 14px; flex: 1; line-height: 1.7; }
  .math-lesson { padding-left: 0; }
  .math-lesson h4 { font-size: 25px; }
  .math-lesson>p:not(.mono):not(.math-formula) { font-size: 14px; }
  .model-notebook-body { grid-template-columns: 1fr; gap: 18px; }
  .math-assumptions { font-size: 14px; }
  .strategy-intro h4 { font-size: 36px; }
}
@media (max-width:360px) {
  .market-intro h3 { font-size: 46px; }
  .market-tabs { gap: 16px; }
  .market-tabs button { font-size: 14px; }
  .math-controls { gap: 0 15px; }
  .math-controls h4 { font-size: 24px; }
  .math-kind button { padding-inline: 11px; }
  .math-resample { font-size: 14px; padding-inline: 10px; }
  .math-view-heading h5 { font-size: 17px; }
  .model-prices output { font-size: 34px; }
  .model-greeks { gap: 10px; }
  .model-greeks strong { font-size: 19px; }
}


/* Iridescent chrome: a sharp metal reflection under shifting spectral color. */
.market-achievement {
 --metal-bright: #f6fbff; --metal-mid: #a4beff; --metal-dark: #4864b0;
 --metal-sheen: #fff; --metal-cyan: #83efff; --metal-violet: #c5a4ff; --metal-gold: #ffc997;
 --metal-spectrum: linear-gradient(105deg, #63dfff80, #9180ff80 28%, #ff9cc670 48%, #ffd99d80 68%, #65e5fa80 88%, #9180ff80);
}
:root[data-theme=light] .market-achievement {
 --metal-bright: #48649b; --metal-mid: #304e8b; --metal-dark: #151f49;
 --metal-sheen: #a4b4d4; --metal-cyan: #167487; --metal-violet: #7045b6; --metal-gold: #97602e;
 --metal-spectrum: linear-gradient(105deg, #007f9b90, #6034bc90 28%, #ba427b80 48%, #995b2590 68%, #007f9b90 88%, #6034bc90);
}
.market-achievement .achievement-icon { width: 48px; height: 48px; flex: 0 0 48px; filter: drop-shadow(0 1px 1px rgb(0 0 0 / .2)); }
.achievement-icon .metal-bright { stop-color: var(--metal-bright); }
.achievement-icon .metal-mid { stop-color: var(--metal-mid); }
.achievement-icon .metal-dark { stop-color: var(--metal-dark); }
.achievement-icon .metal-cyan { stop-color: var(--metal-cyan); }
.achievement-icon .metal-violet { stop-color: var(--metal-violet); }
.achievement-icon .metal-gold { stop-color: var(--metal-gold); }
.market-achievement .achievement-result { display: flex; align-items: baseline; flex-wrap: wrap; column-gap: 11px; row-gap: 0; }
.market-achievement .achievement-chrome { display: inline-block; font-weight: 700; font-size: 38px; line-height: 1.2; letter-spacing: -.035em; color: var(--ink); }
.market-achievement .achievement-finish { font-size: 21px; font-weight: 500; color: var(--muted); }
@supports ((background-clip: text) or (-webkit-background-clip: text)) {
 .market-achievement .achievement-chrome {
  background-image: linear-gradient(112deg, transparent 39%, var(--metal-sheen) 49%, transparent 59%), var(--metal-spectrum), linear-gradient(180deg, var(--metal-bright) 0%, var(--metal-mid) 27%, var(--metal-bright) 45%, var(--metal-dark) 49%, var(--metal-dark) 54%, var(--metal-mid) 65%, var(--metal-bright) 82%, var(--metal-mid) 100%);
  background-size: 240% 100%, 210% 100%, 100% 100%;
  background-position: 170% 0, 0% 0, 0 0;
  background-repeat: no-repeat;
  background-clip: text; -webkit-background-clip: text; color: transparent;
  animation: achievement-polish 4.8s ease-in-out infinite;
 }
}
@keyframes achievement-polish {
 0%, 10% { background-position: 170% 0, 0% 0, 0 0; }
 65%, 100% { background-position: -70% 0, 100% 0, 0 0; }
}
@media (max-width: 600px) { .market-achievement .achievement-chrome { font-size: 34px; } }
@media (prefers-reduced-motion: reduce) { .market-achievement .achievement-chrome { animation: none; } }
@media (forced-colors: active) { .market-achievement .achievement-chrome { background: none; color: CanvasText; animation: none; } .achievement-icon { stroke: CanvasText; filter: none; } }