@font-face{font-family:Inter;src:url("Inter-Regular.ttf")}@font-face{font-family:Inter;src:url("Inter-Bold.ttf");font-weight:700}
:root{--paper:#fbf8f2;--ink:#14110d;--orange:#f47715;--od:#bb4e00;--line:#ece5d2;--muted:#655f58;--sand:#c9bfae}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:25px}body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,Arial,sans-serif;-webkit-font-smoothing:antialiased}
a{color:inherit}a:focus-visible{outline:3px solid var(--orange);outline-offset:4px}
.shell{max-width:1180px;margin:auto;padding:0 32px}.mono{font:700 11px/1.5 ui-monospace,monospace;letter-spacing:.1em;text-transform:uppercase}
.nav{background:#fff;border-bottom:1px solid var(--line)}.nav-inner{max-width:1180px;margin:auto;padding:20px 32px;display:flex;justify-content:space-between;align-items:center}.brand svg{width:155px;height:28px;display:block}.nav-links{display:flex;gap:28px;align-items:center}.nav-links a{text-decoration:none;font-size:13px}.nav-links .btn,.button{background:var(--ink);color:#fff;border-radius:8px;padding:13px 20px;font-weight:700;text-decoration:none;font-size:13px}
.crumb{padding:16px 0;border-bottom:1px solid var(--line);font-size:12px;color:var(--muted)}.crumb a{color:#a64b08;text-decoration:none}
/* hero: quiet, headline + byline + one small figure */
.hero-grid{display:grid;grid-template-columns:1.3fr .7fr;gap:56px;align-items:end;padding-top:64px;padding-bottom:54px}
.eyebrow{color:#a64b08}h1{font-size:44px;line-height:1.1;letter-spacing:-2px;margin:18px 0 22px;font-weight:700}.lede{font-size:18px;line-height:1.65;color:#4a463d;max-width:620px;margin:0}
.meta{display:flex;flex-wrap:wrap;gap:8px 10px;font-size:12.5px;color:var(--muted);margin:24px 0}.actions{display:flex;align-items:center;gap:16px;margin-top:24px}.free{font-size:11px;color:var(--muted);line-height:1.6}
.herofig{background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px 20px 8px}
.fl{color:#837e72;margin-bottom:12px}.hp{margin:0 0 14px}.hp>b{display:block;font-size:12px;margin-bottom:5px}
.barrow{display:grid;grid-template-columns:54px 1fr 54px;gap:10px;align-items:center;margin:5px 0;font-size:11px}.bl{color:#837e72}.bv{font-weight:700;text-align:right;font-size:12px}
.bar{display:block;height:11px;background:var(--line);border-radius:99px;overflow:hidden}.bar i{display:block;height:100%;border-radius:99px;width:var(--w);transition:width 1.2s cubic-bezier(.2,.7,.2,1)}
.js .bar i{width:0}.js .in .bar i,.js .bar.in i{width:var(--w)}
.bar.old i{background:var(--sand)}.bar.new i{background:var(--orange)}.bar.ink i{background:var(--ink)}
.in .bar.new i{transition-delay:.25s}
/* reading */
.reading{display:grid;grid-template-columns:220px minmax(0,740px);gap:58px;padding-top:54px;padding-bottom:70px;border-top:1px solid var(--line)}
.toc{align-self:start;position:sticky;top:28px}.toc>p{color:var(--muted);margin:0 0 18px}.toc a{display:flex;gap:12px;border-top:1px solid var(--line);padding:12px 0;font-size:12px;line-height:1.6;text-decoration:none}.toc span{color:#a64b08;font:12px monospace}.toc a:hover{color:var(--od)}
.article p{font-size:17px;line-height:1.85;margin:0 0 22px;color:#2f2b26}.article>.sec{margin-top:58px}
.article h2{font-size:29px;line-height:1.25;letter-spacing:-.9px;margin:0 0 22px}.article h2:before{content:attr(data-n);display:block;font:11px/1.5 ui-monospace,monospace;color:#a64b08;letter-spacing:.1em;margin-bottom:12px}
.num{font-weight:700;color:#a64b08;font-variant-numeric:tabular-nums}
.note{font-size:15px!important;color:var(--muted)!important;border-left:3px solid var(--orange);padding-left:16px}
.glance{list-style:none;margin:0;padding:0;border-top:1px solid var(--ink)}.glance li{font-size:17px;line-height:1.6;padding:15px 0;border-bottom:1px solid var(--line)}
/* figures */
.fig{margin:30px 0;background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px 24px}.fig figcaption{font-size:12.5px;line-height:1.65;color:var(--muted);margin-top:14px}
.fig .barrow{grid-template-columns:78px 1fr 56px;margin:7px 0}.grp{margin:0 0 18px}.grp>b{display:block;font-size:13px;margin-bottom:4px}
.cards3{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.cards3>div,.cards2>div{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:15px 16px}.cards3 b{display:block;font-size:14px;line-height:1.35;margin-bottom:6px}.cards3 span{font-size:13px;line-height:1.5;color:#4a463d}
.loop{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(5,1fr);gap:10px;counter-reset:s}.loop li{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:14px 12px;position:relative;counter-increment:s}.loop li:before{content:counter(s);display:block;color:var(--orange);font-weight:700;font-size:18px;margin-bottom:6px}.loop b{display:block;font-size:14px}.loop span{display:block;font-size:12px;line-height:1.5;color:#4a463d;margin-top:3px}.loop li:last-child{background:#fdeedd;border-color:var(--orange)}
.rules{list-style:none;margin:0;padding:0}.rules>li{display:flex;gap:20px;padding:22px 0;border-top:1px solid var(--line)}.rules>li:first-child{border-top:1px solid var(--ink)}.rn{font-size:34px;font-weight:700;color:var(--orange);line-height:1;width:30px;flex:none}.rules h3{font-size:19px;margin:0 0 8px;letter-spacing:-.4px}.rules p{margin:0!important}
.gauge{margin:20px 0 6px}.gtrack{position:relative;height:12px;background:var(--line);border-radius:99px}.gtrack i{position:absolute;top:0;bottom:0;border-radius:99px}.g80{left:0;width:80%;background:var(--sand);transform-origin:left;transition:transform 1.1s}.g90{left:80%;width:10%;background:var(--orange)}.glab{display:flex;gap:20px;margin-top:10px;font-size:12px}.glab em{display:inline-block;width:10px;height:10px;border-radius:50%;margin-right:7px;vertical-align:-1px}.k1{background:var(--sand)}.k2{background:var(--orange)}.glab b{color:var(--od)}
.starts{list-style:none;margin:0 0 14px;padding:0;display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.starts li{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:13px;font-size:13px;line-height:1.4}.starts b{display:block;color:var(--orange);font-size:18px;margin-bottom:5px}
.chips{margin:0!important;display:flex;flex-wrap:wrap;gap:8px}.chips span{font-size:12px!important;border:1px solid var(--line);background:var(--paper);border-radius:99px;padding:5px 12px}
.pf{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:0 0 26px}.pf>div{border-radius:12px;padding:16px 18px;border:1px solid var(--line);background:#fff}.pf .pass{background:#fdeedd;border-color:var(--orange)}.pf .mono{display:block;color:var(--od);margin-bottom:8px}.pf q{font-size:15px;line-height:1.55}
.tl{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:14px;position:relative}.tl li{border-top:3px solid var(--sand);padding-top:14px;font-size:13px;line-height:1.5}.tl b{display:block;font-size:26px;letter-spacing:-.8px;margin-bottom:4px}.tl em{display:block;font-style:normal;font-size:11px;font-family:ui-monospace,monospace;letter-spacing:.08em;text-transform:uppercase;color:#837e72;margin-top:6px}.tl .d2{border-top-color:var(--orange)}.tl .d2 em{color:var(--od)}.tl .d3{border-top-color:var(--ink)}
.tl .d2 b:after{content:"";display:inline-block;width:9px;height:9px;border-radius:50%;background:var(--orange);margin-left:10px;animation:pulse 2.4s ease-in-out infinite}
@keyframes pulse{0%,100%{box-shadow:0 0 0 0 rgba(244,119,21,.45)}50%{box-shadow:0 0 0 8px rgba(244,119,21,0)}}
.path{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-top:20px;padding-top:16px;border-top:1px solid var(--line)}.path .mono{color:#837e72;margin-right:6px}.path code{font:700 12.5px ui-monospace,monospace;border:1.5px solid var(--orange);border-radius:9px;padding:6px 11px;background:#fff}.path i{color:var(--orange);font-style:normal;font-weight:700}
.split{display:grid;grid-template-columns:1fr 1fr;gap:26px}.sl{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:8px;font-size:13px}.sl span{color:#837e72;font-size:12px}.sbar{display:flex;gap:3px;height:22px}.sbar i{display:block;border-radius:6px;width:var(--w);transition:width 1.2s cubic-bezier(.2,.7,.2,1)}.js .sbar i{width:0}.js .in .sbar i{width:var(--w)}.sbar .q{background:var(--orange)}.sbar .m{background:var(--ink);min-width:6px}.slg{display:flex;justify-content:space-between;font-size:12px;margin-top:8px;color:#4a463d}.slg b{font-size:18px;color:var(--od);margin-right:4px}
.pr{display:grid;grid-template-columns:1fr 1fr;gap:16px}.pr span{display:block;color:#837e72;margin-bottom:6px}.pr s{display:block;color:#837e72;font-size:16px}.pr b{display:block;font-size:42px;color:var(--od);letter-spacing:-1.5px;line-height:1.1}
.plain{margin:0 0 6px;padding-left:20px}.plain li{font-size:16px;line-height:1.7;margin-bottom:8px}
/* limits: prominent */
.limits{background:#171512;color:#fff;border-radius:20px;padding:36px 38px 20px;margin-top:64px!important}.limits h2:before{color:#ffab6a}.limits p{color:#e8e0d2!important;font-size:18px!important}.limits .num{color:#ffab6a}
.cards2{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:6px 0 26px}.limits .cards2>div{background:#221f1b;border-color:#443a2e}.cards2 .mono{color:#ffab6a;display:block;margin-bottom:8px}.cards2 p{font-size:15px!important;line-height:1.55!important;margin:0!important}
.closer{font-size:26px!important;font-weight:700;letter-spacing:-.6px;margin:56px 0 24px!important;color:var(--ink)!important}
.method{border:1px solid var(--line);background:#fff;border-radius:14px;padding:18px 22px}.method .mono{color:#837e72}.method p{font-size:13px!important;line-height:1.7!important;color:var(--muted)!important;margin:8px 0 0!important}
.footer{background:#fff;border-top:1px solid var(--line);padding:26px 0;color:var(--muted);font-size:12px}.footer .shell{display:flex;justify-content:space-between}
@media(prefers-reduced-motion:reduce){.bar i,.sbar i{transition:none}.tl .d2 b:after{animation:none}html{scroll-behavior:auto}}
@media(max-width:900px){h1{font-size:36px}.hero-grid{grid-template-columns:1fr;gap:34px;align-items:start}.reading{grid-template-columns:1fr;gap:0;padding-top:34px}.toc{position:static;margin-bottom:40px}.loop{grid-template-columns:1fr}.loop li{display:flex;gap:14px;align-items:baseline}.loop li:before{margin:0}.starts{grid-template-columns:1fr 1fr}}
@media(max-width:650px){.toc{display:none}.shell{padding:0 20px}.nav-inner{padding:17px 20px}.nav-links{gap:0}.nav-links a:not(.btn){display:none}.nav-links .btn{padding:10px 14px;font-size:12px}.hero-grid{padding-top:36px;padding-bottom:30px}h1{font-size:32px;letter-spacing:-1.2px}.lede{font-size:16px}.article p{font-size:16px}.article h2{font-size:25px}.fig{padding:18px}.cards3,.pf,.cards2,.split,.pr,.tl{grid-template-columns:1fr}.starts{grid-template-columns:1fr}.limits{padding:26px 22px 12px}.limits p{font-size:16px!important}.rules>li{gap:14px}.footer .shell{display:block}.footer a{display:block;margin-top:10px}.closer{font-size:22px!important}.herofig{padding:16px 16px 4px}}
.cta{margin:0 0 34px!important}.cta .button{display:inline-block}