.stack-app {
    --quant-ink: var(--card-text-color-main);
    --quant-canvas: #efe9da;
    --quant-paper: var(--card-background);
    --quant-green: #1f6655;
    --quant-green-soft: #d7e5d6;
    --quant-clay: #bc5b3b;
    --quant-gold: #c89b47;
    --quant-line: var(--card-separator-color);
    --quant-muted: var(--card-text-color-secondary);
}

.stack-app .quant-page {
    min-width: 320px;
    background: var(--card-background);
    color: inherit;
    font-family: var(--base-font-family);
}

.stack-app .quant-page .global-nav {
    background: var(--card-background);
    border-bottom: 1px solid var(--card-separator-color);
    box-shadow: none;
    backdrop-filter: blur(14px);
}

.stack-app .quant-page .global-nav a {
    color: inherit;
}

.stack-app .quant-page .global-nav a:hover,
.stack-app .quant-page .global-nav a[aria-current="page"] {
    color: inherit;
}

.stack-app .quant-hero {
    position: relative;
    min-height: 590px;
    overflow: hidden;
    padding: 0;
    text-align: left;
    background:
        var(--card-background);
    border-bottom: 1px solid var(--card-separator-color);
}

.stack-app .quant-hero::before {
    content: "";
    position: absolute;
    inset: 0;
    opacity: 0.34;
    background-image: none;
    background-size: 42px 42px;
    mask-image: linear-gradient(90deg, black 25%, transparent 82%);
}

.stack-app .quant-hero::after {
    content: "∑";
    position: absolute;
    right: max(6vw, 36px);
    bottom: -0.27em;
    color: inherit;
    font-family: var(--base-font-family);
    font-size: clamp(25.6rem, 34vw, 51.2rem);
    font-style: italic;
    line-height: 1;
    pointer-events: none;
}

.stack-app .quant-hero__paper {
    position: absolute;
    width: min(40vw, 600px);
    height: 145%;
    right: 11%;
    top: -24%;
    transform: rotate(9deg);
    border: 1px solid var(--card-separator-color);
    background: var(--card-background);
    box-shadow: var(--shadow-l1);
}

.stack-app .quant-hero__axis {
    position: absolute;
    right: 6%;
    bottom: 87px;
    z-index: 1;
    display: flex;
    width: min(35vw, 430px);
    justify-content: space-between;
    border-bottom: 1px solid var(--card-separator-color);
}

.stack-app .quant-hero__axis span {
    width: 1px;
    height: 11px;
    background: var(--card-background);
}

.stack-app .quant-hero__content {
    position: relative;
    z-index: 2;
    width: min(1180px, calc(100% - 40px));
    margin: 0 auto;
    padding: 83px 0 58px;
}

.stack-app .quant-kicker,
.stack-app .section-lead > div > span,
.stack-app .panel-index,
.stack-app .case-tag,
.stack-app .research-checklist > div > span {
    margin: 0;
    color: inherit;
    font-family: "Cascadia Mono", Consolas, monospace;
    font-size: 1.152rem;
    font-weight: 700;
    letter-spacing: 0.14em;
}

.stack-app .quant-kicker {
    display: flex;
    align-items: center;
    gap: 9px;
}

.stack-app .quant-kicker span {
    width: 24px;
    height: 1px;
    background: var(--card-background);
}

.stack-app .quant-hero h1 {
    max-width: 720px;
    margin: 17px 0;
    font-size: clamp(5.12rem, 7vw, 10.56rem);
    font-weight: 500;
    letter-spacing: -0.08em;
    line-height: 0.97;
}

.stack-app .quant-hero h1 em {
    color: inherit;
    font-weight: 400;
}

.stack-app .quant-hero__intro {
    max-width: 590px;
    margin: 0;
    color: inherit;
    font-size: 1.68rem;
    line-height: 1.9;
}

.stack-app .quant-hero__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 29px;
}

.stack-app .quant-primary-btn,
.stack-app .quant-secondary-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 18px;
    min-height: 43px;
    box-sizing: border-box;
    padding: 10px 16px;
    border: 1px solid var(--card-separator-color);
    border-radius: var(--card-border-radius);
    cursor: pointer;
    font-family: var(--base-font-family);
    font-size: 1.376rem;
    text-decoration: none;
    transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.stack-app .quant-primary-btn {
    background: var(--card-background);
    color: inherit;
}

.stack-app .quant-primary-btn:hover {
    background: var(--card-background);
    color: inherit;
    transform: translateY(-2px);
}

.stack-app .quant-secondary-btn {
    background: var(--card-background);
    color: inherit;
}

.stack-app .quant-secondary-btn:hover {
    background: var(--card-background);
    transform: translateY(-2px);
}

.stack-app .quant-hero__stats {
    display: flex;
    flex-wrap: wrap;
    gap: 1px;
    width: fit-content;
    margin: 58px 0 0;
    border: 1px solid var(--card-separator-color);
    background: var(--card-background);
}

.stack-app .quant-hero__stats div {
    min-width: 94px;
    padding: 10px 16px;
    background: var(--card-background);
}

.stack-app .quant-hero__stats dt {
    color: inherit;
    font-family: "Cascadia Mono", Consolas, monospace;
    font-size: 1.856rem;
    font-weight: 800;
}

.stack-app .quant-hero__stats dd {
    margin: 3px 0 0;
    color: inherit;
    font-size: 1.152rem;
}

.stack-app .quant-shell {
    width: min(1180px, calc(100% - 40px));
    margin: 0 auto;
    padding: 28px 0 76px;
}

.stack-app .quant-disclaimer {
    display: grid;
    grid-template-columns: 26px 1fr;
    gap: 13px;
    padding: 15px 17px;
    border: 1px solid var(--card-separator-color);
    background: var(--card-background);
    color: inherit;
    font-size: 1.344rem;
    line-height: 1.65;
}

.stack-app .quant-disclaimer p { margin: 0; }

.stack-app .quant-disclaimer__mark {
    display: grid;
    width: 24px;
    height: 24px;
    place-items: center;
    border: 1px solid var(--card-separator-color);
    color: inherit;
    font-family: var(--base-font-family);
    font-weight: 700;
}

.stack-app .research-map,
.stack-app .practice-section,
.stack-app .case-section,
.stack-app .research-checklist {
    margin-top: 76px;
}

.stack-app .section-lead {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 30px;
    margin-bottom: 23px;
}

.stack-app .section-lead h2,
.stack-app .research-checklist h2 {
    margin: 5px 0 0;
    color: inherit;
    font-size: clamp(2.88rem, 3.4vw, 4.8rem);
    font-weight: 500;
    letter-spacing: -0.055em;
    line-height: 1.15;
}

.stack-app .section-lead > p {
    max-width: 330px;
    margin: 0;
    color: inherit;
    font-size: 1.408rem;
    line-height: 1.7;
    text-align: right;
}

.stack-app .research-path {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1px;
    margin: 0;
    padding: 0;
    list-style: none;
    border: 1px solid var(--card-separator-color);
    background: var(--card-background);
}

.stack-app .node-button {
    min-height: 255px;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    padding: 19px;
    border: 0;
    background: var(--card-background);
    color: inherit;
    cursor: pointer;
    text-align: left;
    transition: background 0.2s ease, transform 0.2s ease;
}

.stack-app .node-button:hover {
    z-index: 1;
    background: var(--card-background);
    box-shadow: var(--shadow-l1);
    transform: translateY(-4px);
}

.stack-app .node-number {
    color: inherit;
    font-family: "Cascadia Mono", Consolas, monospace;
    font-size: 1.152rem;
}

.stack-app .node-symbol {
    margin: auto 0 12px;
    color: inherit;
    font-family: var(--base-font-family);
    font-size: 5.12rem;
    line-height: 0.8;
}

.stack-app .node-button strong {
    font-size: 1.84rem;
    font-weight: 600;
}

.stack-app .node-button small {
    min-height: 42px;
    margin-top: 7px;
    color: inherit;
    font-family: var(--base-font-family);
    font-size: 1.216rem;
    line-height: 1.6;
}

.stack-app .node-button i {
    margin-top: 13px;
    color: inherit;
    font-family: "Cascadia Mono", Consolas, monospace;
    font-size: 1.088rem;
    font-style: normal;
}

.stack-app .practice-section {
    padding: 29px;
    border: 1px solid var(--card-separator-color);
    background: var(--card-background);
}

.stack-app .practice-header {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 250px;
    gap: 28px;
    align-items: end;
}

.stack-app .practice-header .section-lead { margin: 0; }

.stack-app .practice-progress {
    padding: 15px;
    border: 1px solid var(--card-separator-color);
    background: var(--card-background);
}

.stack-app .progress-copy {
    display: flex;
    justify-content: space-between;
    gap: 10px;
    color: inherit;
    font-size: 1.216rem;
}

.stack-app .progress-copy strong { color: inherit; font-family: "Cascadia Mono", Consolas, monospace; }

.stack-app .progress-track {
    height: 5px;
    margin: 11px 0 10px;
    overflow: hidden;
    background: var(--card-background);
}

.stack-app .progress-track span {
    display: block;
    width: 0;
    height: 100%;
    background: var(--card-background);
    transition: width 0.35s ease;
}

.stack-app #reset-progress {
    padding: 0;
    border: 0;
    background: transparent;
    color: inherit;
    cursor: pointer;
    font-family: var(--base-font-family);
    font-size: 1.152rem;
    text-decoration: underline;
    text-underline-offset: 3px;
}

.stack-app .practice-tabs {
    display: flex;
    gap: 0;
    margin-top: 32px;
    border-bottom: 1px solid var(--card-separator-color);
    overflow-x: auto;
}

.stack-app .practice-tab {
    flex: 1 0 auto;
    min-width: 160px;
    padding: 11px 15px;
    border: 0;
    border-top: 1px solid var(--card-separator-color);
    background: transparent;
    color: inherit;
    cursor: pointer;
    font-family: var(--base-font-family);
    font-size: 1.44rem;
    text-align: left;
}

.stack-app .practice-tab span { margin-right: 8px; color: inherit; font-family: "Cascadia Mono", Consolas, monospace; font-size: 1.152rem; }

.stack-app .practice-tab.is-active {
    border-color: var(--card-separator-color);
    background: var(--card-background);
    color: inherit;
}

.stack-app .practice-panel {
    display: grid;
    grid-template-columns: minmax(250px, 0.76fr) minmax(0, 1.24fr);
    gap: 30px;
    padding: 30px 0 3px;
    animation: quant-panel-in 0.26s ease both;
}

.stack-app .practice-panel[hidden] { display: none; }

.stack-app .practice-panel__intro h3 {
    margin: 8px 0 10px;
    color: inherit;
    font-size: 2.64rem;
    font-weight: 500;
    letter-spacing: -0.04em;
}

.stack-app .practice-panel__intro > p {
    margin: 0;
    color: inherit;
    font-size: 1.456rem;
    line-height: 1.85;
}

.stack-app .formula-card {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    margin: 22px 0 0;
    background: var(--card-background);
    border: 1px solid var(--card-separator-color);
}

.stack-app .formula-card div { padding: 10px; background: var(--card-background); }
.stack-app .formula-card dt { color: inherit; font-size: 1.088rem; }
.stack-app .formula-card dd { margin: 3px 0 0; font-family: "Cascadia Mono", Consolas, monospace; font-size: 1.376rem; }
.stack-app .formula-card .up-text { color: inherit; }

.stack-app .signal-board,
.stack-app .bias-board {
    padding: 19px;
    border: 1px solid var(--quant-line);
    background: #f8f4e9;
}

.stack-app .price-series {
    display: flex;
    justify-content: space-between;
    color: inherit;
    font-family: "Cascadia Mono", Consolas, monospace;
    font-size: 1.232rem;
}

.stack-app .price-series span:last-child { color: inherit; font-weight: 800; }

.stack-app .mini-chart { margin-top: 7px; }
.stack-app .mini-chart svg { display: block; width: 100%; height: 164px; }
.stack-app .chart-grid { fill: none; stroke: rgba(21, 34, 33, 0.12); stroke-width: 1; }
.stack-app .chart-price { fill: none; stroke: var(--quant-ink); stroke-width: 3; }
.stack-app .chart-fast { fill: none; stroke: var(--quant-green); stroke-width: 3; }
.stack-app .chart-slow { fill: none; stroke: var(--quant-clay); stroke-width: 3; stroke-dasharray: 5 4; }
.stack-app .chart-dot { fill: var(--quant-green); stroke: #f8f4e9; stroke-width: 3; }

.stack-app .chart-legend { display: flex; flex-wrap: wrap; gap: 12px; margin: 1px 0 18px; color: inherit; font-family: var(--base-font-family); font-size: 1.12rem; }
.stack-app .chart-legend span { display: inline-flex; align-items: center; gap: 5px; }
.stack-app .chart-legend i { width: 13px; height: 2px; background: var(--card-background); }
.stack-app .chart-legend .fast-dot { background: var(--card-background); }
.stack-app .chart-legend .slow-dot { background: var(--card-background); }

.stack-app .answer-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; }
.stack-app .answer-grid button,
.stack-app .bias-answers button { min-height: 58px; padding: 9px; border: 1px solid var(--card-separator-color); background: var(--card-background); color: inherit; cursor: pointer; font-family: var(--base-font-family); font-size: 1.248rem; transition: border-color .2s ease, background .2s ease, transform .2s ease; }
.stack-app .answer-grid button:hover,
.stack-app .bias-answers button:hover { border-color: var(--card-separator-color); background: var(--card-background); transform: translateY(-2px); }
.stack-app .answer-grid button.is-correct,
.stack-app .bias-answers button.is-correct { border-color: var(--card-separator-color); background: var(--card-background); color: inherit; }
.stack-app .answer-grid button.is-wrong,
.stack-app .bias-answers button.is-wrong { border-color: var(--card-separator-color); background: var(--card-background); color: inherit; }

.stack-app .answer-feedback,
.stack-app .position-feedback { min-height: 24px; margin: 15px 0 0; color: inherit; font-size: 1.28rem; line-height: 1.65; }
.stack-app .answer-feedback.is-success,
.stack-app .position-feedback.is-success { color: var(--stack-success); }
.stack-app .answer-feedback.is-error,
.stack-app .position-feedback.is-error { color: var(--stack-danger); }

.stack-app .risk-note { margin-top: 22px; padding: 12px; border-left: 1px solid var(--card-separator-color); background: var(--card-background); color: inherit; font-size: 1.264rem; line-height: 1.7; }
.stack-app .risk-note b,
.stack-app .risk-note span { display: block; }
.stack-app .risk-note span { margin-top: 3px; font-family: "Cascadia Mono", Consolas, monospace; font-size: 1.12rem; }

.stack-app .position-lab { display: grid; gap: 17px; padding: 19px; border: 1px solid var(--card-separator-color); background: var(--card-background); }
.stack-app .position-lab label > span { display: flex; justify-content: space-between; color: inherit; font-size: 1.344rem; }
.stack-app .position-lab output { color: inherit; font-family: "Cascadia Mono", Consolas, monospace; }
.stack-app .position-lab input[type="range"] { width: 100%; accent-color: var(--quant-green); }
.stack-app .price-inputs { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.stack-app .price-inputs label { display: grid; gap: 6px; color: inherit; font-size: 1.28rem; }
.stack-app .price-inputs input { width: 100%; box-sizing: border-box; padding: 8px; border: 1px solid var(--card-separator-color); border-radius: var(--card-border-radius); background: var(--card-background); color: inherit; font-family: var(--base-font-family); }
.stack-app .position-lab .quant-primary-btn { width: 100%; }

.stack-app .position-result { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; margin-top: 16px; border: 1px solid var(--card-separator-color); background: var(--card-background); }
.stack-app .position-result span,
.stack-app .position-result strong { display: block; }
.stack-app .position-result span { padding: 10px 11px 0; background: var(--card-background); color: inherit; font-size: 1.088rem; }
.stack-app .position-result strong { padding: 3px 11px 11px; background: var(--card-background); color: inherit; font-family: "Cascadia Mono", Consolas, monospace; font-size: 1.488rem; }

.stack-app .bias-clue { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-top: 24px; color: inherit; font-family: "Cascadia Mono", Consolas, monospace; font-size: 1.088rem; }
.stack-app .bias-clue i { width: 22px; height: 1px; background: var(--card-background); }
.stack-app .bias-answers { display: grid; grid-template-columns: repeat(3, 1fr); gap: 9px; }
.stack-app .bias-answers button { display: flex; flex-direction: column; gap: 8px; align-items: flex-start; text-align: left; }
.stack-app .bias-answers b { color: inherit; font-family: "Cascadia Mono", Consolas, monospace; }
.stack-app .bias-explanation { min-height: 75px; margin-top: 16px; padding: 12px 14px; border-left: 1px solid var(--card-separator-color); background: var(--card-background); }
.stack-app .bias-explanation span { color: inherit; font-family: "Cascadia Mono", Consolas, monospace; font-size: 1.072rem; font-weight: 700; letter-spacing: .1em; }
.stack-app .bias-explanation p { margin: 5px 0 0; color: inherit; font-size: 1.312rem; line-height: 1.65; }
.stack-app .bias-explanation.is-success { border-color: var(--card-separator-color); background: var(--card-background); }
.stack-app .bias-explanation.is-success span { color: var(--stack-success); }

.stack-app .case-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 11px; }
.stack-app .case-card { min-height: 290px; display: flex; flex-direction: column; padding: 20px; border: 1px solid var(--card-separator-color); background: var(--card-background); box-sizing: border-box; transition: transform .2s ease, box-shadow .2s ease; }
.stack-app .case-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-l1); }
.stack-app .case-card--sma { border-top: 1px solid var(--card-separator-color); }
.stack-app .case-card--momentum { border-top: 1px solid var(--card-separator-color); }
.stack-app .case-card--pairs { border-top: 1px solid var(--card-separator-color); }
.stack-app .case-card--paper { border-top: 1px solid var(--card-separator-color); }
.stack-app .case-card h3 { margin: 23px 0 8px; font-size: 2.16rem; font-weight: 500; }
.stack-app .case-card p { margin: 0; color: inherit; font-family: var(--base-font-family); font-size: 1.264rem; line-height: 1.75; }
.stack-app .case-card dl { display: flex; gap: 18px; margin: auto 0 16px; padding-top: 15px; border-top: 1px solid var(--card-separator-color); }
.stack-app .case-card dt { color: inherit; font-size: 1.04rem; }
.stack-app .case-card dd { margin: 3px 0 0; color: inherit; font-size: 1.152rem; }
.stack-app .case-card a { color: inherit; font-family: "Cascadia Mono", Consolas, monospace; font-size: 1.152rem; text-decoration: none; }
.stack-app .case-card a:hover { text-decoration: underline; text-underline-offset: 4px; }

.stack-app .research-checklist { display: grid; grid-template-columns: minmax(240px, .8fr) minmax(0, 1.2fr); gap: 38px; padding: 30px; border-top: 1px solid var(--card-separator-color); border-bottom: 1px solid var(--card-separator-color); }
.stack-app .research-checklist ul { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; margin: 0; padding: 0; list-style: none; background: var(--card-background); border: 1px solid var(--card-separator-color); }
.stack-app .research-checklist li { display: grid; grid-template-columns: 34px 1fr; gap: 9px; align-items: center; padding: 14px; background: var(--card-background); color: inherit; font-size: 1.312rem; line-height: 1.6; }
.stack-app .research-checklist b { color: inherit; font-family: "Cascadia Mono", Consolas, monospace; font-size: 1.152rem; }

.stack-app .quant-footer { border-top: 1px solid var(--card-separator-color); background: var(--card-background); color: inherit; }

@keyframes quant-panel-in { from { opacity: 0; transform: translateY(5px); } to { opacity: 1; transform: translateY(0); } }

@media (max-width: 1000px) {
    .stack-app .case-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .stack-app .research-path { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .stack-app .node-button { min-height: 210px; }
    .stack-app .node-symbol { margin-top: 36px; }
    .stack-app .practice-panel { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
    .stack-app .quant-hero { min-height: 560px; }
    .stack-app .quant-hero__content,
.stack-app .quant-shell { width: min(100% - 28px, 1180px); }
    .stack-app .quant-hero__content { padding: 67px 0 44px; }
    .stack-app .quant-hero h1 { max-width: 520px; font-size: clamp(4.8rem, 14vw, 7.68rem); }
    .stack-app .quant-hero__paper { width: 80vw; right: -27%; opacity: .6; }
    .stack-app .quant-hero__axis { width: 58vw; right: -2%; }
    .stack-app .section-lead { display: block; }
    .stack-app .section-lead > p { margin-top: 10px; text-align: left; }
    .stack-app .practice-section { padding: 18px; }
    .stack-app .practice-header { grid-template-columns: 1fr; }
    .stack-app .practice-header .section-lead { margin-bottom: 20px; }
    .stack-app .case-grid { grid-template-columns: 1fr; }
    .stack-app .case-card { min-height: 238px; }
    .stack-app .research-checklist { grid-template-columns: 1fr; gap: 22px; padding: 21px 0; }
}

@media (max-width: 520px) {
    .stack-app .quant-hero__stats { width: 100%; }
    .stack-app .quant-hero__stats div { flex: 1; min-width: 0; padding: 10px; }
    .stack-app .research-path { grid-template-columns: 1fr; }
    .stack-app .node-button { min-height: 164px; }
    .stack-app .node-symbol { margin: 20px 0 10px; font-size: 4.32rem; }
    .stack-app .formula-card,
.stack-app .position-result,
.stack-app .answer-grid,
.stack-app .bias-answers { grid-template-columns: 1fr; }
    .stack-app .formula-card div { display: flex; justify-content: space-between; align-items: center; }
    .stack-app .formula-card dd { margin: 0; }
    .stack-app .position-result span { padding-bottom: 0; }
    .stack-app .position-result strong { padding-top: 2px; }
    .stack-app .practice-tabs { margin-top: 23px; }
    .stack-app .practice-tab { min-width: 136px; padding: 10px; }
    .stack-app .price-inputs { grid-template-columns: 1fr; }
    .stack-app .bias-clue { gap: 5px; }
    .stack-app .bias-clue i { width: 10px; }
    .stack-app .research-checklist ul { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
    .stack-app .quant-page *,
.stack-app .quant-page *::before,
.stack-app .quant-page *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; scroll-behavior: auto !important; transition-duration: .01ms !important; }
}