:root{
  color-scheme: light;
  --bg:#f7f9fc;
  --surface:#ffffff;
  --surface-muted:#f3f6fb;
  --ink:#101828;
  --ink-soft:#344054;
  --muted:#667085;
  --line:#c8d9ee;
  --line-strong:#93b9d8;
  --brand:#1e3a5f;
  --brand-deep:#162c47;
  --brand-soft:#e8f0fa;
  --shadow:0 22px 70px rgba(16,24,40,.08);
  --font-sans:"Avenir Next",Avenir,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{margin:0;background:radial-gradient(circle at top left,rgba(30,58,95,.05),transparent 25%),linear-gradient(180deg,#fafcff 0%,var(--bg) 100%);color:var(--ink);font-family:var(--font-sans)}
a{color:inherit}
.ee-page{width:min(1240px,calc(100vw - 32px));margin:0 auto;padding:24px 0 64px}
.ee-shell{border:1px solid var(--line);background:rgba(255,255,255,.9);border-radius:32px;box-shadow:var(--shadow);overflow:hidden}
.ee-hero{padding:40px;background:linear-gradient(180deg,rgba(232,240,250,.95) 0%,rgba(255,255,255,.96) 100%),radial-gradient(circle at 18% 14%,rgba(30,58,95,.11),transparent 22%),radial-gradient(circle at 84% 12%,rgba(43,100,214,.10),transparent 22%);position:relative}
.ee-hero::after{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(30,58,95,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(30,58,95,.045) 1px,transparent 1px);background-size:28px 28px;mask-image:linear-gradient(180deg,rgba(0,0,0,.35),transparent 70%);pointer-events:none}
.ee-hero-grid,.ee-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:24px;position:relative;z-index:1}
.ee-kicker,.ee-boards,.ee-tag-row{display:flex;flex-wrap:wrap;gap:10px}
.ee-chip{display:inline-flex;align-items:center;min-height:32px;padding:0 14px;border-radius:999px;background:rgba(47,111,214,.10);color:#2048a5;font-size:.76rem;font-weight:800;text-transform:uppercase;letter-spacing:.08em}
.ee-chip.board{background:rgba(255,255,255,.92);color:#425466;border:1px solid #d7e4ec}
.ee-title{margin:18px 0 10px;font-size:clamp(2.5rem,5vw,4.4rem);line-height:.95;letter-spacing:-.04em;font-weight:900;color:#081221}
.ee-summary{max-width:760px;margin:0;color:var(--ink-soft);font-size:1.08rem;line-height:1.8}
.ee-learning-strip{display:flex;flex-wrap:wrap;gap:14px 18px;margin:22px 0 0}
.ee-learning-step{display:inline-flex;align-items:center;gap:10px;font-size:.85rem;font-weight:900;letter-spacing:.06em;text-transform:uppercase;color:#0b1e34}
.ee-learning-step::before{content:"";width:9px;height:9px;border-radius:999px;background:#3b82f6;box-shadow:0 0 0 4px rgba(59,130,246,.14)}
.ee-formula-card{margin-top:26px;border:1px solid var(--line-strong);border-radius:26px;background:linear-gradient(180deg,#ffffff 0%,#f8fbff 100%);box-shadow:inset 0 1px 0 rgba(255,255,255,.7),0 16px 50px rgba(15,23,42,.07);padding:28px 26px;overflow:auto}
.ee-formula-card .katex,.ee-formula-card .katex-display,.ee-formula-card .katex *{color:#0f1728!important}
.ee-formula-card .katex{font-size:1.8rem!important}
.ee-plain-formula{margin:0;white-space:pre-wrap;font:600 1rem/1.7 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;color:var(--ink)}
.ee-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}
.ee-button{display:inline-flex;align-items:center;justify-content:center;min-height:52px;padding:0 20px;border-radius:18px;border:1px solid transparent;font-weight:800;font-size:1rem;line-height:1;text-decoration:none;cursor:pointer;transition:.18s ease}
.ee-button.primary{background:var(--brand);color:#fff;box-shadow:0 12px 30px rgba(30,58,95,.18)}
.ee-button.primary:hover{background:var(--brand-deep)}
.ee-button.secondary{background:#fff;color:#0f1728;border-color:#cfe1d9}
.ee-button.secondary:hover{border-color:#9fd8c0;color:var(--brand)}
.ee-button.ghost{background:var(--brand-soft);color:var(--brand-deep);border-color:#bde8cf}
.ee-copy-status{min-height:20px;margin-top:10px;color:var(--brand-deep);font-size:.92rem}
.ee-note{margin:14px 0 0;color:var(--muted);font-size:.98rem;line-height:1.7}
.ee-rail,.ee-section{border:1px solid var(--line);border-radius:26px;background:var(--surface);box-shadow:0 10px 32px rgba(16,24,40,.05)}
.ee-rail{padding:20px;position:sticky;top:24px;align-self:start}
.ee-rail-title,.ee-section-kicker{margin:0;font-size:.74rem;font-weight:900;text-transform:uppercase;letter-spacing:.2em;color:#667085}
.ee-jump{margin-top:16px;display:grid;gap:10px}
.ee-jump a{display:block;padding:14px 16px;border-radius:15px;background:#f5f8f7;text-decoration:none;color:#101828;font-weight:700}
.ee-jump a:hover{background:#edf9f2;color:var(--brand-deep)}
.ee-detail-list{display:grid;gap:12px;margin-top:24px}
.ee-detail-row{display:flex;justify-content:space-between;gap:14px;color:var(--ink-soft);font-size:.95rem}
.ee-detail-row strong{color:var(--ink)}
.ee-layout{padding:0 40px 40px}
.ee-content{display:grid;gap:22px}
.ee-section{padding:26px}
.ee-section h2{margin:0;font-size:1.48rem;line-height:1.15;letter-spacing:-.03em;color:#081221}
.ee-section p,.ee-section li{color:var(--ink-soft);font-size:1.02rem;line-height:1.85}
.ee-section p + p{margin-top:14px}
.ee-section ul,.ee-section ol{padding-left:22px;margin:18px 0 0}
.ee-section strong{color:var(--ink)}
.ee-meta-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:14px;margin-top:18px}
.ee-mini-card,.ee-related-card,.ee-surface{border:1px solid #dce8f5;border-radius:18px;background:var(--surface-muted)}
.ee-mini-card{padding:16px}
.ee-mini-symbol{color:#1e3a5f;font-size:1.08rem;font-weight:900}
.ee-mini-label{margin-top:6px;color:var(--ink);font-weight:800}
.ee-mini-meta{margin-top:8px;color:var(--muted);font-size:.94rem}
.ee-step-list{display:grid;gap:14px;margin-top:18px}
.ee-step{display:grid;grid-template-columns:36px minmax(0,1fr);gap:14px}
.ee-step-index{width:36px;height:36px;border-radius:999px;background:var(--brand-soft);color:var(--brand-deep);display:flex;align-items:center;justify-content:center;font-weight:900}
.ee-step-body{border:1px solid #dce8f5;border-radius:18px;background:var(--surface-muted);padding:16px}
.ee-step-body h3{margin:0;font-size:1rem;color:var(--ink)}
.ee-step-body .ee-math{margin-top:12px;overflow:auto}
.ee-step-body .ee-math .katex,.ee-step-body .ee-math .katex *{color:var(--ink)!important}
.ee-result-block{margin-top:16px;padding:18px;border-radius:20px;border:1px solid #bfdbfe;background:linear-gradient(180deg,#eff6ff 0%,#ffffff 100%)}
.ee-rearrangement-grid,.ee-related-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px;margin-top:18px}
.ee-related-card{padding:18px;text-decoration:none;transition:.18s ease}
.ee-related-card:hover{border-color:#b9d9cc;transform:translateY(-1px)}
.ee-related-card h3{margin:0;font-size:1.02rem;color:var(--ink)}
.ee-related-card p{margin:8px 0 0;font-size:.95rem}
.ee-surface{padding:18px;margin-top:18px}
.ee-formula-inline .katex,.ee-formula-inline .katex *{color:var(--ink)!important}
.ee-graph-widget svg{width:100%;height:auto;display:block}
.ee-graph-stage{margin-top:18px;padding:16px;border-radius:20px;background:linear-gradient(180deg,#f8faff 0%,#f0f4ff 100%);border:1px solid #c8d9ee}
.ee-graph-empty{color:var(--muted);font-size:.98rem}
.ee-practice-inputs,.ee-unit-list{display:grid;gap:10px;margin-top:14px}
.ee-practice-chip{display:inline-flex;align-items:center;gap:8px;padding:10px 12px;border-radius:14px;background:#f5f8f7;color:var(--ink);font-size:.95rem;font-weight:700}
.ee-calculator-widget{margin-top:18px;padding:22px;border:1px solid #c8d9ee;border-radius:22px;background:linear-gradient(180deg,#f8faff 0%,#f0f4ff 100%)}
.ee-calculator-form{display:grid;gap:16px}
.ee-form-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px}
.ee-field{display:grid;gap:8px}
.ee-field label{font-size:.9rem;font-weight:800;color:var(--ink)}
.ee-field small{color:var(--muted)}
.ee-field input,.ee-field select{min-height:48px;width:100%;border:1px solid #c8d9ee;border-radius:14px;background:#fff;color:var(--ink);font:inherit;padding:0 14px}
.ee-field input::placeholder{color:#98a2b3}
.ee-calc-formula-display{min-height:48px;width:100%;border:1px solid #c8d9ee;border-radius:14px;background:#fff;padding:8px 14px;overflow:auto;display:flex;align-items:center}
.ee-calc-formula-display .katex,.ee-calc-formula-display .katex *{color:var(--ink)!important}
.ee-calc-formula-display .katex-display{margin:0}
.ee-widget-result{min-height:78px;border-radius:18px;background:#fff;border:1px solid #c8d9ee;padding:16px}
.ee-widget-result strong{display:block;font-size:.82rem;letter-spacing:.12em;text-transform:uppercase;color:#667085}
.ee-widget-value{margin-top:8px;font-size:1.5rem;font-weight:900;color:#1e3a5f}
.ee-muted{color:var(--muted)}
.ee-sources{margin-top:18px}
.ee-navbar{display:flex;align-items:center;justify-content:space-between;padding:0 32px;height:60px;background:rgba(15,28,48,.97);border-bottom:1px solid rgba(255,255,255,.08);backdrop-filter:blur(8px);position:sticky;top:0;z-index:100}
.ee-navbar-logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:#ffffff;font-weight:900;font-size:1.08rem}
.ee-navbar-logo img{height:30px;width:auto}
.ee-navbar-cta{display:inline-flex;align-items:center;min-height:36px;padding:0 16px;border-radius:12px;background:var(--brand);color:#fff;font-weight:800;font-size:.88rem;text-decoration:none;letter-spacing:.01em}
.ee-navbar-cta:hover{background:var(--brand-deep)}
.ee-search-wrap{position:relative;flex:1;max-width:520px;margin:0 20px}
.ee-search-input{width:100%;height:36px;border:1px solid rgba(255,255,255,.2);border-radius:10px;background:rgba(255,255,255,.12);color:#fff;font:inherit;font-size:.88rem;padding:0 12px;outline:none}
.ee-search-input::placeholder{color:rgba(255,255,255,.5)}
.ee-search-input:focus{border-color:rgba(255,255,255,.5);background:rgba(255,255,255,.18)}
.ee-search-dropdown{position:absolute;top:calc(100% + 6px);left:0;right:0;background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:0 16px 40px rgba(16,24,40,.12);overflow:hidden;z-index:200}
.ee-search-result{display:block;padding:12px 16px;text-decoration:none;color:var(--ink);border-bottom:1px solid #f0f4f8}
.ee-search-result:last-child{border-bottom:none}
.ee-search-result:hover,.ee-search-result:focus{background:#f5f8ff}
.ee-search-result-title{font-weight:800;font-size:.95rem;color:#0f172a}
.ee-search-result-formula{margin:4px 0 2px;font-size:.85rem;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.ee-search-result-formula .katex,.ee-search-result-formula .katex *{color:var(--ink)!important}
.ee-search-result-meta{font-size:.8rem;color:var(--muted)}
.ee-search-footer{display:block;padding:10px 16px;font-size:.8rem;color:var(--muted);text-align:center;border-top:1px solid #f0f4f8;text-decoration:none}
.ee-search-footer:hover{background:#f5f8ff;color:var(--brand)}
@media (max-width:1120px){.ee-hero-grid,.ee-layout{grid-template-columns:1fr}.ee-rail{position:static}}
@media (max-width:760px){.ee-page{width:min(100vw - 20px,1240px)}.ee-hero,.ee-layout{padding-left:18px;padding-right:18px}.ee-hero{padding-top:24px}.ee-title{font-size:2.65rem}.ee-section,.ee-rail{padding:18px}.ee-formula-card{padding:18px}.ee-formula-card .katex{font-size:1.25rem!important}.ee-search-wrap{max-width:none;margin:0 8px}}
.ee-faq{display:grid;gap:12px;margin-top:18px}
.ee-faq-item{border:1px solid var(--line);border-radius:18px;overflow:hidden}
.ee-faq-q{width:100%;text-align:left;background:#f8fbff;border:none;padding:16px 20px;font:800 1rem/1.4 var(--font-sans);color:var(--ink);cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:12px}
.ee-faq-q::after{content:"+";font-size:1.2rem;font-weight:400;color:var(--brand);flex-shrink:0;transition:.18s}
.ee-faq-item.open .ee-faq-q::after{content:"−"}
.ee-faq-a{display:none;padding:0 20px 16px;color:var(--ink-soft);font-size:.98rem;line-height:1.8}
.ee-faq-item.open .ee-faq-a{display:block}
.ee-symbol-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:10px;margin-top:16px}
.ee-symbol-item{display:flex;align-items:center;gap:10px;padding:10px 14px;background:#f8fbff;border:1px solid var(--line);border-radius:10px}
.ee-symbol-token{font-size:1.3rem;font-weight:700;min-width:28px;text-align:center;color:var(--brand)}
.ee-symbol-name{font-size:.88rem;color:var(--ink);flex:1;min-width:0}
.ee-symbol-rel{font-size:.75rem;color:var(--brand);background:rgba(43,100,214,.08);padding:2px 7px;border-radius:5px;white-space:nowrap}
.ee-map-wrap{border-radius:12px;overflow:hidden;background:#dce8f5;margin-top:4px}
.ee-map-wrap svg{display:block;width:100%;height:auto}
.ee-scientist-hero{display:grid;grid-template-columns:minmax(0,1fr) 220px;gap:28px;align-items:start}
.ee-scientist-portrait{display:flex;flex-direction:column;align-items:flex-start;gap:12px}
.ee-scientist-avatar{width:160px;height:160px;border-radius:50%;object-fit:cover;background:#f0f4ff;border:3px solid #fff;box-shadow:0 2px 12px rgba(30,58,95,.13);flex-shrink:0}
.ee-scientist-portrait-credit{width:min(220px,100%);padding:12px 14px;border:1px solid var(--line);border-radius:18px;background:linear-gradient(180deg,#ffffff 0%,#f8fbff 100%);font-size:.78rem;line-height:1.55;color:var(--ink-soft)}
.ee-scientist-portrait-credit strong{display:block;margin-bottom:6px;font-size:.7rem;font-weight:900;letter-spacing:.16em;text-transform:uppercase;color:var(--muted)}
.ee-scientist-portrait-credit p{margin:0}
.ee-scientist-portrait-credit p + p{margin-top:6px}
.ee-scientist-portrait-credit a{color:var(--brand);font-weight:800;text-decoration:underline;text-underline-offset:2px}
.ee-prop-table{width:100%;border-collapse:collapse;margin-top:18px}
.ee-prop-table th,.ee-prop-table td{text-align:left;padding:10px 14px;border-bottom:1px solid var(--line);font-size:.95rem}
.ee-prop-table th{font-weight:800;color:var(--ink);background:#f8fbff;font-size:.9rem;white-space:nowrap}
.ee-prop-table tr:last-child td{border-bottom:none}
.ee-example-block{background:#f8fbff;border:1px solid var(--line);border-radius:14px;padding:14px;margin-bottom:10px;overflow:auto}
.ee-usage-list{list-style:none;padding:0;margin:12px 0 0;display:grid;gap:8px}
.ee-usage-list li{display:flex;align-items:center;gap:10px;font-size:.95rem;color:var(--ink-soft)}
.ee-usage-list li::before{content:"\25B6";color:var(--brand);font-size:.7rem}
.ee-constant-value{margin-top:20px;padding:22px;border:1px solid var(--line-strong);border-radius:22px;background:linear-gradient(180deg,#ffffff 0%,#f8fbff 100%)}
.ee-constant-value .katex{font-size:1.5rem!important}
.ee-richtext{display:grid;gap:14px}
.ee-richtext p{margin:0}
.ee-richtext .katex-display-wrapper{display:block;overflow:auto}
.ee-timeline{display:grid;gap:14px;margin-top:6px}
.ee-timeline-item{padding:16px 18px;border-radius:18px;border:1px solid var(--line);background:linear-gradient(180deg,#ffffff 0%,#f8fbff 100%)}
.ee-timeline-year{font-size:.8rem;font-weight:900;letter-spacing:.16em;text-transform:uppercase;color:var(--brand)}
.ee-timeline-item h3{margin:8px 0 6px;font-size:1.05rem}
.ee-highlight-grid{display:grid;gap:14px;grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.ee-code-block{margin:16px 0 0;padding:18px;border-radius:18px;border:1px solid var(--line);background:#0f1c30;color:#f8fbff;overflow:auto;font:500 .95rem/1.7 ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace;white-space:pre-wrap;word-break:break-word}
.ee-code-block code{color:inherit}
.ee-code-block.inline{margin-top:0}
.ee-example-output{margin-top:10px;padding:12px 14px;border-radius:14px;background:#f8fbff;border:1px solid var(--line);color:var(--ink-soft)}
.ee-badge-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}
.ee-badge{display:inline-flex;align-items:center;padding:8px 12px;border-radius:999px;background:#eef4ff;color:#1f4fbf;font-size:.82rem;font-weight:800;letter-spacing:.02em}
.ee-badge.success{background:#ecfdf3;color:#067647}
.ee-badge.warn{background:#fff6e5;color:#b54708}
.ee-kv-grid{display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));margin-top:18px}
.ee-kv-card{padding:16px;border:1px solid var(--line);border-radius:18px;background:linear-gradient(180deg,#ffffff 0%,#f8fbff 100%)}
.ee-kv-card strong{display:block;font-size:.82rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.ee-kv-card > span{display:block;margin-top:10px;font-size:1rem;color:var(--ink);line-height:1.7}
.ee-kv-card .ee-formula-display{margin-top:12px;overflow:auto;text-align:center;padding:4px 0}
.ee-kv-card .ee-formula-display .katex,.ee-kv-card .ee-formula-display .katex *{color:var(--ink)!important}
.ee-kv-card .ee-formula-display .katex{font-size:1.3rem!important}
.ee-kv-card .ee-formula-display .katex-display{margin:0}
.ee-kv-card .ee-original-form-text{font-size:1.02rem;color:var(--ink);line-height:1.7;text-align:left}
.ee-symbol-token .katex{font-size:1.15rem}
.ee-detail-stack{display:grid;gap:10px;margin-top:18px}
.ee-detail-stack p{margin:0}
@media(max-width:760px){.ee-scientist-hero{grid-template-columns:1fr}.ee-scientist-avatar{max-width:120px}}