:root{--bg:#F4F7FB;--paper:#fff;--ink:#162C46;--muted:#64758a;--blue:#2952CC;--gold:#B87920;--up:#CD4B43;--down:#138364;--line:#dce4ef;--soft:#edf2fa;--radius:12px;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg)}*{box-sizing:border-box}body{margin:0}.topbar{height:66px;position:sticky;top:0;z-index:20;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:32px;padding:0 28px}.brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;font-weight:700;white-space:nowrap}.brand small{display:block;color:var(--muted);font-size:11px;font-weight:500;margin-top:2px}.brand-mark{width:32px;height:32px;border-radius:8px;background:var(--ink);color:#fff;display:grid;place-items:center;font-family:ui-monospace,monospace;font-size:18px}nav{display:flex;gap:8px;height:100%;align-items:center}nav a{color:#53657b;text-decoration:none;padding:9px 12px;border-radius:7px;font-size:14px}nav a.active,nav a:hover{background:#edf2ff;color:var(--blue)}.menu-toggle{display:none;margin-left:auto}.shell{display:grid;grid-template-columns:260px minmax(0,1fr);gap:30px;max-width:1480px;margin:auto;padding:24px 28px}.sidebar{position:sticky;top:82px;height:calc(100vh - 100px);display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:16px 12px 14px;min-height:280px}.search-label{font-size:12px;color:var(--muted);margin:0 4px 7px}.sidebar input{width:100%;border:1px solid var(--line);border-radius:7px;padding:10px;font:inherit;font-size:13px}.toc{overflow:auto;margin-top:12px;flex:1}.module-link{font-size:12px;color:#748397;padding:10px 7px 5px;font-weight:700}.lesson-link{display:block;padding:8px 9px;margin:1px 0;border-radius:6px;text-decoration:none;color:#46566b;font-size:13px;line-height:1.4}.lesson-link.current{background:#eaf0ff;color:var(--blue);font-weight:650}.search-results{position:absolute;top:86px;left:12px;right:12px;max-height:46vh;overflow:auto;z-index:4;background:#fff;border:1px solid var(--line);box-shadow:0 10px 24px #162c4620;border-radius:8px;padding:6px}.progress-box{border-top:1px solid var(--line);padding:12px 5px 0;font-size:12px;color:var(--muted);display:grid;grid-template-columns:1fr auto;gap:8px}.progress-box b{color:var(--ink)}.progress-track{grid-column:1/3;height:4px;background:var(--soft);border-radius:4px}.progress-track i{height:100%;display:block;background:var(--blue);width:0;border-radius:4px}main{min-width:0;max-width:1050px;width:100%;margin:0 auto}.page-heading{margin:4px 0 20px}.eyebrow{font:600 11px ui-monospace,monospace;letter-spacing:.08em;color:var(--blue);text-transform:uppercase}.page-heading h1{font-size:28px;line-height:1.3;margin:7px 0;color:var(--ink)}.page-heading p,.muted{color:var(--muted);line-height:1.7}.paper,.lesson-card,.tool-card,.section-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;margin-bottom:14px}.lesson-card{padding:30px;max-width:860px}.lesson-card h1{font-size:30px;line-height:1.35;margin:7px 0 10px}.summary{font-size:17px;color:#3f526a;line-height:1.7;border-left:3px solid var(--gold);padding-left:14px;margin:18px 0 24px}.lesson-section{margin:24px 0}.lesson-section h2,.paper h2,.tool-card h2{font-size:19px;margin:0 0 12px}.lesson-section p,.paper p{line-height:1.9;color:#34475f;margin:0 0 12px}.lesson-section ul{padding-left:20px;color:#34475f;line-height:1.8}.example{background:#f6f8fc;border-radius:9px;padding:18px;margin:18px 0}.tag{display:inline-block;background:#edf2ff;color:var(--blue);padding:4px 8px;border-radius:4px;font-size:11px}.row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.split{display:grid;grid-template-columns:1fr 1fr;gap:12px}.quiz-option{display:block;width:100%;text-align:left;border:1px solid var(--line);background:#fff;border-radius:7px;padding:11px 13px;margin:7px 0;color:var(--ink);cursor:pointer}.quiz-option:hover{border-color:var(--blue)}.quiz-feedback{margin-top:10px;padding:12px;background:#edf6f2;border-radius:7px;line-height:1.65}.actions{display:flex;justify-content:space-between;gap:12px;margin-top:24px}.button{border:1px solid var(--line);background:#fff;color:var(--ink);padding:10px 14px;border-radius:7px;font:inherit;cursor:pointer}.button.primary{background:var(--blue);border-color:var(--blue);color:#fff}.button:disabled{opacity:.45;cursor:not-allowed}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #9db6ff;outline-offset:2px}.chart-frame{height:300px;max-height:42vh;min-height:210px;background:#fbfcfe;border:1px solid var(--line);border-radius:9px;overflow:hidden}.chart-frame canvas{width:100%;height:100%;display:block}.controls{display:flex;flex-wrap:wrap;gap:12px}.controls label{display:grid;gap:6px;font-size:12px;color:var(--muted);min-width:130px}.controls input[type=range]{width:160px;accent-color:var(--blue)}.controls input[type=number],.controls select{border:1px solid var(--line);border-radius:6px;padding:8px;font:inherit;color:var(--ink);width:100%}.legend{font:12px ui-monospace,monospace;color:#4d5c70;display:flex;gap:15px;flex-wrap:wrap}.shape-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:9px}.shape-card{border:1px solid var(--line);border-radius:8px;padding:12px;background:#fff}.shape-card b{display:block;font-size:13px}.shape-card span{color:var(--muted);font-size:12px;line-height:1.5}.disclaimer{font-size:12px;color:#815d27;background:#fff7e9;border:1px solid #f0dfbd;padding:8px 10px;border-radius:6px;display:inline-block}.field-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.result{padding:18px;border-radius:9px;background:#eef3ff;margin-top:15px}.result strong{font:700 27px ui-monospace,monospace;color:var(--blue)}.terms-list{display:grid;grid-template-columns:1fr 1fr;gap:10px}.term{padding:14px;border:1px solid var(--line);border-radius:8px}.term b{display:block;margin-bottom:5px}.term p{font-size:13px;margin:0}.source-link{color:var(--blue);overflow-wrap:anywhere}.case-choice{display:flex;gap:8px;flex-wrap:wrap;margin:12px 0}.case-step{color:var(--muted);font-size:13px}.footer-note{color:var(--muted);font-size:12px;margin:20px 0}
@media(max-width:850px){.topbar{padding:0 16px;gap:10px}.topbar nav{overflow:auto}.shell{grid-template-columns:220px minmax(0,1fr);gap:16px;padding:16px}.shape-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:650px){.topbar{height:58px}.topbar nav{display:none}.menu-toggle{display:block;border:1px solid var(--line);border-radius:6px;background:#fff;padding:8px 10px;color:var(--ink)}.shell{display:block;padding:12px}.sidebar{display:none;position:relative;top:auto;height:auto;max-height:44vh;margin-bottom:14px}.sidebar.open{display:flex}.toc{max-height:25vh;min-height:80px}.search-results{position:relative;top:auto;left:auto;right:auto;max-height:30vh}.page-heading h1{font-size:24px}.lesson-card{padding:20px}.lesson-card h1{font-size:25px}.paper,.tool-card{padding:16px}.field-grid,.terms-list,.split{grid-template-columns:1fr}.chart-frame{height:250px;max-height:38vh}.controls label{min-width:calc(50% - 8px);flex:1}.controls input[type=range]{width:100%}.actions .button{flex:1}.shape-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
.module-link{display:flex;width:100%;justify-content:space-between;align-items:center;border:0;background:transparent;text-align:left;cursor:pointer;font:700 12px inherit}.module-link:hover{background:#f4f7fb;color:var(--blue)}.row .tag{flex:none}.lesson-card .row{align-items:flex-start;line-height:1.8}.lesson-card .row:not(:has(.tag)){display:block}.lesson-card .example p{line-height:1.85}.lesson-card [aria-disabled="true"]{pointer-events:none;opacity:.4}
@media(max-width:650px){.topbar{position:sticky;top:0;flex-wrap:wrap;height:auto;min-height:58px;padding:7px 12px}.tool-tabs{display:flex!important;order:3;overflow-x:auto;flex:0 0 calc(100% + 24px);margin:0 -12px -7px;padding:0 8px;border-top:1px solid var(--line);height:42px;white-space:nowrap}.tool-tabs a{flex:none;padding:8px 10px}.shell{padding-top:12px}.sidebar{max-height:44vh}.toc{max-height:20vh}}
.chart-frame.study-price{height:260px;max-height:32vh;min-height:190px}.chart-frame.study-sub{height:150px;max-height:20vh;min-height:110px;margin-top:10px}.anatomy-frame{height:220px;max-height:30vh;min-height:175px}.chart-stack{max-width:100%;overflow:hidden}.mode-select{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:13px;margin-bottom:12px}.mode-select select{max-width:260px}.study-description{line-height:1.7;color:#43566e;margin:14px 0}.study-description p{margin:4px 0}.study-description strong{font-family:ui-monospace,monospace;color:var(--blue)}.shape-svg{display:block;width:100%;height:60px;background:#f8fafd;border-radius:5px;margin-bottom:8px}.shape-card .diagram-caption{display:block;color:var(--gold);font-size:10px;margin:3px 0 5px}.shape-card span:last-child{display:block}.shape-card{min-width:0;line-height:1.55}
.case-toolbar{display:flex;align-items:end;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:12px}.case-toolbar label{display:grid;gap:6px;font-size:12px;color:var(--muted)}.case-toolbar select{min-width:190px;border:1px solid var(--line);border-radius:6px;padding:9px;background:#fff;color:var(--ink);font:inherit}.case-neutral{font-size:18px;margin:10px 0}.case-facts{background:#f6f8fc;border-left:3px solid var(--gold);padding:10px 14px;margin:12px 0 16px;line-height:1.75}.case-facts p{margin:3px 0}.case-facts b{color:var(--ink)}.case-result{background:#fff7e9;border:1px solid #f0dfbd;border-radius:8px;padding:14px;margin-top:12px;line-height:1.7}.case-result p{margin:7px 0 0}.case-choice .button{flex:1;min-width:150px}.case-step{font-family:ui-monospace,monospace}
.position-fields{grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.position-field{display:grid;gap:6px;color:var(--ink);font-size:13px}.position-field input{min-width:0;border:1px solid var(--line);border-radius:6px;padding:10px;font:inherit;color:var(--ink)}.position-field small{font-size:11px;line-height:1.5;color:var(--muted)}.result h2{font-size:17px;margin:0 0 4px}.result strong{display:block;font-size:30px;margin:4px 0 12px}.position-breakdown{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin:12px 0}.position-breakdown div{background:#fff;border:1px solid #dce4ef;border-radius:7px;padding:10px;min-width:0}.position-breakdown dt{font-size:11px;color:var(--muted)}.position-breakdown dd{font:600 15px ui-monospace,monospace;margin:6px 0 0;overflow-wrap:anywhere}.zero-shares{padding:10px;background:#fff7e9;border-radius:7px;line-height:1.65}.position-error{color:#a13d35}.result>p{line-height:1.7}@media(max-width:650px){.position-fields{grid-template-columns:1fr 1fr}.position-breakdown{grid-template-columns:1fr 1fr}}
.position-fields{grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.position-field{display:grid;gap:6px;color:var(--ink);font-size:13px}.position-field input{min-width:0;border:1px solid var(--line);border-radius:6px;padding:10px;font:inherit;color:var(--ink)}.position-field small{font-size:11px;line-height:1.5;color:var(--muted)}.result h2{font-size:17px;margin:0 0 4px}.result strong{display:block;font-size:30px;margin:4px 0 12px}.position-breakdown{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin:12px 0}.position-breakdown div{background:#fff;border:1px solid #dce4ef;border-radius:7px;padding:10px;min-width:0}.position-breakdown dt{font-size:11px;color:var(--muted)}.position-breakdown dd{font:600 15px ui-monospace,monospace;margin:6px 0 0;overflow-wrap:anywhere}.zero-shares{padding:10px;background:#fff7e9;border-radius:7px;line-height:1.65}.position-error{color:#a13d35}.result>p{line-height:1.7}@media(max-width:650px){.position-fields{grid-template-columns:1fr 1fr}.position-breakdown{grid-template-columns:1fr 1fr}}
.term-search-label{display:block;color:var(--muted);font-size:12px;margin-bottom:6px}.term-search{width:100%;max-width:440px;padding:10px;border:1px solid var(--line);border-radius:7px;font:inherit}.term-count{font-size:12px;color:var(--muted);margin:9px 0}.terms-scroll{max-height:65vh;overflow-y:auto;padding:2px 8px 2px 2px;align-content:start}.terms-scroll .term[hidden]{display:none}.canvas-fallback{font-size:12px;color:var(--muted)}canvas{color:var(--muted);font-size:12px}

main:focus{outline:none}.shape-svg{display:block;width:100%;height:100px;max-height:110px}.shape-card{min-width:0}.shape-card b{line-height:1.5}.shape-card span{display:block}.case-quote{font:12px ui-monospace,monospace;line-height:1.8;background:#f1f5fb;padding:12px;border-radius:6px}.lesson-card p,.example p,.section-card p{line-height:1.85;overflow-wrap:anywhere}.lesson-card li{line-height:1.8}#patterns,#indicators{scroll-margin-top:90px}@media(max-width:650px){#patterns,#indicators{scroll-margin-top:130px}}.site-layout{width:100%;max-width:1660px;margin:0 auto;padding:22px 22px 40px;display:grid;grid-template-columns:minmax(145px,158px) minmax(0,1fr) minmax(145px,158px);gap:18px;align-items:start}.commercial-area{display:contents}.site-layout>.shell{grid-column:2;grid-row:1;max-width:none;width:100%;margin:0;padding:0;grid-template-columns:250px minmax(0,1fr);gap:22px}.commercial-rail{position:sticky;top:82px;display:grid;gap:12px;align-content:start;min-width:0}.commercial-rail--left{grid-column:1;grid-row:1}.commercial-rail--right{grid-column:3;grid-row:1}.commercial-card{min-width:0;padding:13px 12px 12px;border:1px solid var(--line);border-top:3px solid var(--gold);border-radius:10px;background:#fff;box-shadow:0 3px 12px #162c460a;overflow-wrap:anywhere}.commercial-card--ad{border-top-color:var(--blue);background:#fbfcff}.commercial-card__top{display:flex;align-items:center;gap:6px}.commercial-card__type{display:inline-flex;align-items:center;min-height:20px;padding:2px 7px;border-radius:999px;background:#fff4d9;color:#815d27;font-size:10px;font-weight:700;letter-spacing:.02em}.commercial-card--ad .commercial-card__type{background:#edf2ff;color:var(--blue)}.commercial-card h2{margin:10px 0 5px;color:var(--ink);font-size:14px;line-height:1.45}.commercial-card__copy{margin:0;color:#53657b;font-size:11px;line-height:1.6}.commercial-card__status{display:block;margin-top:10px;padding-top:8px;border-top:1px solid #e9eef5;color:#7a6744;font-size:10px;line-height:1.4}.commercial-card--ad .commercial-card__status{color:var(--blue)}@media(max-width:1180px){.site-layout{grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;padding:16px}.commercial-area{display:grid;grid-column:1/-1;grid-row:1;grid-template-columns:inherit;gap:inherit}.commercial-rail{display:contents}.site-layout>.shell{grid-column:1/-1;grid-row:2;max-width:1480px;margin:0 auto;grid-template-columns:250px minmax(0,1fr);gap:20px}.commercial-card{height:100%}}@media(max-width:850px){.site-layout{gap:9px;padding:14px}.site-layout>.shell{grid-template-columns:220px minmax(0,1fr);gap:16px}.commercial-card{padding:12px 10px}.commercial-card h2{font-size:13px}.commercial-card__copy{font-size:10px}}@media(max-width:650px){.site-layout{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;padding:12px}.commercial-area{grid-template-columns:inherit}.site-layout>.shell{grid-column:1/-1;grid-row:2;display:block;width:100%;padding:0}.commercial-card{height:100%;padding:11px 10px}.commercial-card h2{margin:8px 0 4px;font-size:12px}.commercial-card__copy{font-size:10px;line-height:1.5}.commercial-card__status{margin-top:8px;padding-top:7px;font-size:9px}}