:root{
--ink:#101425;
--ink-soft:#1b2138;
--paper:#f4f5f7;
--card:#ffffff;
--line:#d9dde4;
--text:#14171f;
--muted:#5a6272;
--accent:#f2b21c;
--action:#1b45c4;
--action-dark:#14349a;
--sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
--mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
--wrap:1120px;
--read:768px;
}

*,*::before,*::after{box-sizing:border-box}

html,body{
max-width:100%;
overflow-x:hidden;
overscroll-behavior-x:none;
}

html{-webkit-text-size-adjust:100%}

body{
margin:0;
background:var(--paper);
color:var(--text);
font-family:var(--sans);
font-size:17px;
line-height:1.65;
-webkit-font-smoothing:antialiased;
}

img{max-width:100%;height:auto;display:block}

a{color:var(--action);text-decoration:underline;text-underline-offset:2px;text-decoration-thickness:1px}
a:hover{color:var(--action-dark)}
a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--action);outline-offset:2px}

.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 20px}

.site-header{background:var(--ink);color:#fff}
.header-inner{
display:flex;align-items:center;justify-content:space-between;gap:16px;
min-height:66px;
}
.logo{
display:inline-flex;align-items:center;gap:10px;
color:#fff;text-decoration:none;
font-weight:700;font-size:16px;letter-spacing:-.01em;
}
.logo img{width:28px;height:28px;border-radius:6px}
.logo span{white-space:nowrap}
.logo:hover{color:var(--accent)}

.btn{
display:inline-block;
background:var(--action);
color:#fff;
font-family:var(--sans);
font-size:15px;font-weight:600;line-height:1.2;
padding:12px 20px;
border-radius:8px;
text-decoration:none;
white-space:nowrap;
}
.btn:hover{background:var(--action-dark);color:#fff}
.btn-header{padding:10px 16px;font-size:14px}
.btn-lg{padding:14px 26px;font-size:16px}

main{display:block;padding-bottom:56px}

.hero{padding:44px 0 34px}
.hero-grid{display:grid;grid-template-columns:1fr;gap:26px;align-items:start}
.hero h1{
margin:0 0 14px;
font-size:clamp(30px,5vw,44px);
line-height:1.12;
letter-spacing:-.025em;
font-weight:800;
max-width:none;
}
.byline{
margin:0 0 16px;
font-size:14px;line-height:1.5;
color:var(--muted);
font-weight:400;
}
.byline .byline-author{color:var(--action);font-weight:600;text-decoration:underline;text-underline-offset:2px}
.byline .byline-author:hover{color:var(--action-dark)}
.hero-lead{margin:0 0 22px;font-size:19px;line-height:1.6}
.hero-fig{margin:0}
.hero-fig img{width:100%;border-radius:12px;border:1px solid var(--line)}

.content{max-width:100%}
.content.narrow{max-width:820px}
.updated{margin:0 0 22px;font-size:13.5px;color:var(--muted);font-family:var(--mono);letter-spacing:-.01em}
.lead{font-size:19px;line-height:1.6;margin:0 0 8px;color:#252a35}
.author-hero{display:flex;gap:22px;align-items:center;flex-wrap:wrap;margin:0 0 26px;padding:22px;background:var(--card);border:1px solid var(--line);border-radius:12px}
.author-hero img{width:120px;height:120px;border-radius:50%;flex:0 0 120px;border:1px solid var(--line)}
.author-hero-role{margin:0 0 6px;font-size:18px;font-weight:700;letter-spacing:-.01em}
.author-hero-meta{margin:0 0 8px;font-size:14.5px;color:var(--muted);line-height:1.5}
.author-hero-links{margin:0;font-size:14.5px}
.page-title{margin:44px 0 18px;font-size:clamp(28px,4.4vw,38px);line-height:1.15;letter-spacing:-.025em;font-weight:800}
.content h2{
margin:44px 0 14px;
font-size:clamp(22px,3.4vw,29px);
line-height:1.22;
letter-spacing:-.02em;
font-weight:750;
}
.content h3{
margin:30px 0 10px;
font-size:clamp(18px,2.4vw,21px);
line-height:1.3;
letter-spacing:-.01em;
font-weight:700;
}
.content p{margin:0 0 16px}
.content ul{margin:0 0 16px;padding-left:22px}
.content li{margin-bottom:8px}
.content strong{font-weight:670}

.num{font-family:var(--mono);font-size:.94em;font-weight:600;letter-spacing:-.02em}

.figure{margin:26px auto 30px;max-width:520px}
.figure img{width:100%;border-radius:12px;border:1px solid var(--line)}

.toc{
margin:26px 0 8px;
background:var(--card);
border:1px solid var(--line);
border-radius:10px;
}
.toc summary{
cursor:pointer;
padding:13px 16px;
font-weight:650;font-size:15px;
list-style:none;
display:flex;align-items:center;justify-content:space-between;gap:10px;
}
.toc summary::-webkit-details-marker{display:none}
.toc summary::after{content:"+";font-family:var(--mono);font-size:18px;color:var(--muted)}
.toc[open] summary::after{content:"\2212"}
.toc ol{margin:0;padding:0 18px 14px 34px;font-size:15px}
.toc li{margin-bottom:6px}

.table-wrap{
margin:22px 0 8px;
max-width:var(--wrap);
overflow-x:auto;
overscroll-behavior-x:contain;
-webkit-overflow-scrolling:touch;
border:1px solid var(--line);
border-radius:10px;
background:var(--card);
}
table{border-collapse:collapse;width:100%;min-width:660px;font-size:14.5px;line-height:1.45}
th,td{padding:11px 14px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line)}
thead th{
background:var(--ink);color:#fff;
font-size:12.5px;font-weight:650;
letter-spacing:.03em;text-transform:uppercase;
border-bottom:none;white-space:nowrap;
}
tbody tr:last-child td{border-bottom:none}
tbody tr.is-focus td{background:#fff8e6;font-weight:500}
tbody tr.is-focus td:first-child{box-shadow:inset 3px 0 0 var(--accent)}
.cell-cta{margin-top:10px}
.btn-cell{display:block;width:100%;padding:8px 10px;font-size:13px;font-weight:600;border-radius:8px;text-align:center;white-space:nowrap}
.btn-cell-off{background:#e4e7ec;color:#98a0ad;pointer-events:none;cursor:default;user-select:none}
.table-note{margin:10px 0 0;font-size:14px;color:var(--muted);line-height:1.55}

.faq h3{margin-top:26px}

.page-note{margin:30px 0 0;font-size:14.5px;color:var(--muted);line-height:1.6}
.author-card{
margin:44px 0 0;
padding:24px;
background:var(--card);
border:1px solid var(--line);
border-radius:12px;
}
.author-head{display:flex;gap:16px;align-items:center;margin-bottom:14px}
.author-head img{width:78px;height:78px;border-radius:50%;flex:0 0 78px;border:1px solid var(--line)}
.author-name{margin:0;font-size:19px;font-weight:750;letter-spacing:-.01em}
.author-role{margin:2px 0 0;font-size:14.5px;color:var(--muted)}
.author-card p{margin:0 0 13px;font-size:15.5px;line-height:1.6}
.author-card p:last-child{margin-bottom:0}
.author-card p.verified,.verified{font-size:12px;color:var(--muted);font-family:var(--mono);letter-spacing:-.01em}

.cta-band{
margin:40px 0 0;
padding:26px;
background:var(--ink);
border-radius:12px;
color:#fff;
}
.cta-band p{margin:0 0 16px;font-size:17px;line-height:1.55;color:#dfe3ec}
.cta-band strong{color:var(--accent);font-weight:650}
.cta-band .btn{background:var(--accent);color:var(--ink)}
.cta-band .btn:hover{background:#ffc23f;color:var(--ink)}

.site-footer{background:var(--ink);color:#aab2c4;padding:34px 0;font-size:14.5px}
.footer-grid{display:grid;grid-template-columns:1fr;gap:20px}
.site-footer a{color:#dfe3ec}
.site-footer a:hover{color:var(--accent)}
.footer-nav{display:flex;flex-wrap:wrap;gap:8px 20px;margin:0;padding:0;list-style:none}
.footer-legal{margin:0;line-height:1.6}
.footer-legal p{margin:0 0 8px}
.footer-legal p:last-child{margin:0}

@media (min-width:860px){
.hero-grid{grid-template-columns:1.28fr 0.72fr;gap:40px;align-items:center}
.hero{padding:56px 0 44px}
.footer-grid{grid-template-columns:auto 1fr;gap:32px;align-items:start}
}

@media (max-width:600px){
body{font-size:16.5px}
.hero-lead{font-size:17.5px}
.logo span{font-size:15px}
.btn-header{padding:9px 13px;font-size:13.5px}
.author-head{flex-direction:column;align-items:flex-start;gap:12px}
}

@media (prefers-reduced-motion:reduce){
*{animation:none!important;transition:none!important;scroll-behavior:auto!important}
}