:root{--paper:#eef2f4;--sheet:#fff;--ink:#13233a;--ink-soft:#4a5a6e;--line:#c9d3dc;--line-strong:#728298;--accent:#d9771e;--accent-ink:#13233a;--accent-text:#9e4a0b;--accent-wash:#fbeee1;--navy:#13233a;--on-navy:#eef2f4;--r-top:#2f8a57;
--display:"Archivo","Arial Narrow",Arial,sans-serif;--body:"Public Sans",system-ui,-apple-system,"Segoe UI",sans-serif;--mono:"IBM Plex Mono",ui-monospace,Menlo,Consolas,monospace}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){--paper:#0e1724;--sheet:#152234;--ink:#e6edf4;--ink-soft:#9fb0c2;--line:#2a3a50;--line-strong:#5a6e87;--accent:#ee8a32;--accent-ink:#1a0f04;--accent-text:#ee8a32;--accent-wash:#2a2014;--navy:#091220;--r-top:#45ad74;color-scheme:dark}}
:root[data-theme="dark"]{--paper:#0e1724;--sheet:#152234;--ink:#e6edf4;--ink-soft:#9fb0c2;--line:#2a3a50;--line-strong:#5a6e87;--accent:#ee8a32;--accent-ink:#1a0f04;--accent-text:#ee8a32;--accent-wash:#2a2014;--navy:#091220;--r-top:#45ad74;color-scheme:dark}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--body);font-size:17px;line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:inherit}
.wrap{max-width:1160px;margin:0 auto;padding-left:max(20px,env(safe-area-inset-left,0px));padding-right:max(20px,env(safe-area-inset-right,0px))}
h1,h2,h3{font-family:var(--display);font-stretch:85%;line-height:1.08;margin:0;text-wrap:balance;letter-spacing:-.01em}
h1{font-size:clamp(2.2rem,4.6vw,3.5rem);font-weight:790}
h2{font-size:clamp(1.55rem,2.8vw,2.05rem);font-weight:760;margin:56px 0 14px}
h3{font-size:1.2rem;font-weight:700;font-stretch:95%;margin:28px 0 8px}
p{margin:0 0 16px}
.label{font-family:var(--mono);font-size:.74rem;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-soft)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--accent);color:var(--accent-ink);border:0;border-radius:4px;padding:12px 18px;font:600 .98rem var(--body);text-decoration:none;cursor:pointer;white-space:nowrap}
.btn:hover{filter:brightness(1.06)}
.btn.ghost{background:transparent;color:var(--ink);box-shadow:inset 0 0 0 1.5px var(--ink)}
:focus-visible{outline:3px solid var(--accent);outline-offset:3px}
header.top{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--paper) 92%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
header.top .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-block:12px}
.mark{display:inline-flex;align-items:center;gap:9px;font-family:var(--display);font-weight:790;font-stretch:85%;font-size:1.35rem;white-space:nowrap;text-decoration:none;letter-spacing:-.01em}
.mark b{font-weight:460;color:var(--ink-soft)}
.logo-mark{width:30px;height:30px;flex:none}
nav{display:flex;align-items:center;gap:20px;font-size:.93rem;white-space:nowrap}
nav a{text-decoration:none}
nav a:not(.btn):hover{text-decoration:underline;text-underline-offset:4px}
nav a[aria-current]{text-decoration:underline;text-decoration-color:var(--accent);text-underline-offset:5px}
nav .btn{padding:10px 14px}
.menu{position:relative}
.menu summary{list-style:none;cursor:pointer;display:inline-flex;align-items:center;gap:6px}
.menu summary::-webkit-details-marker{display:none}
.menu summary::after{content:"";width:7px;height:7px;border-right:1.6px solid currentColor;border-bottom:1.6px solid currentColor;transform:translateY(-2px) rotate(45deg)}
.menu[open] summary::after{transform:translateY(1px) rotate(225deg)}
.menu-list{position:absolute;top:calc(100% + 14px);left:-16px;width:310px;background:var(--sheet);border:1px solid var(--line);border-radius:10px;box-shadow:0 18px 40px -18px rgba(10,20,35,.35);padding:8px;display:grid;z-index:30;white-space:normal}
.menu-list a{display:block;padding:10px 12px;border-radius:6px;text-decoration:none!important;color:var(--ink)}
.menu-list a:hover,.menu-list a[aria-current]{background:var(--paper)}
.menu-list b{display:block;font-size:.95rem}
.menu-list span{display:block;font-size:.8rem;color:var(--ink-soft);margin-top:2px}
@media (max-width:560px){.menu-list{position:fixed;left:12px;right:12px;top:64px;width:auto}}
@media (max-width:900px){nav .hide-md{display:none}}
.btn .short{display:none}
@media (max-width:560px){nav a:not(.btn){display:none}header.top .mark b{display:none}nav{gap:14px}.btn .long{display:none}.btn .short{display:inline}nav .menu-list a{display:block}}
.crumbs{font-size:.84rem;color:var(--ink-soft);margin-bottom:18px}
.crumbs a{color:var(--ink-soft)}
.hero{border-bottom:1px solid var(--line);padding-block:40px 44px}
.hero .wrap{display:grid;gap:18px;max-width:1160px}
.hero h1{max-width:22ch}
.answer{font-size:1.16rem;line-height:1.6;color:var(--ink);max-width:68ch;border-left:3px solid var(--accent);padding-left:18px;margin:6px 0 0}
.byline{font-size:.88rem;color:var(--ink-soft);display:flex;flex-wrap:wrap;gap:6px 14px}
.byline a{color:var(--ink-soft)}
.hero .ctas{display:flex;flex-wrap:wrap;gap:12px;margin-top:6px}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:22px}
.stat{background:var(--sheet);border:1px solid var(--line);border-radius:8px;padding:18px 18px 16px}
.stat>b{display:block;font-family:var(--display);font-stretch:85%;font-weight:790;font-size:2.4rem;line-height:1;color:var(--accent-text)}
.stat span{display:block;margin-top:8px;font-size:.93rem;line-height:1.45}
.stat small{display:block;margin-top:8px;font-size:.76rem;color:var(--ink-soft)}
.layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:56px;padding-block:8px 64px}
article{min-width:0;max-width:72ch}
article p,article li{color:var(--ink)}
article ul,article ol{padding-left:22px;margin:0 0 18px}
article li{margin-bottom:6px}
article a{color:var(--accent-text);text-underline-offset:3px}
sup.c{font-size:.68rem;line-height:0;margin-left:1px}
sup.c a{text-decoration:none;color:var(--accent-text);font-weight:600}
aside{min-width:0;position:sticky;top:84px;align-self:start;display:grid;gap:16px;padding-top:56px}
.toc{border-left:1px solid var(--line);padding-left:16px;font-size:.88rem;display:grid;gap:7px;white-space:normal;align-items:start}
.toc a{text-decoration:none;color:var(--ink-soft)}
.toc a:hover{color:var(--ink)}
.cta-card{background:var(--navy);color:var(--on-navy);border-radius:8px;padding:20px;display:grid;gap:10px}
.cta-card strong{font-family:var(--display);font-stretch:88%;font-size:1.25rem;line-height:1.15}
.cta-card p{margin:0;font-size:.9rem;color:color-mix(in srgb,var(--on-navy) 80%,transparent)}
.cta-card .btn{justify-self:start}
.cta-card a.sub{font-size:.85rem;color:var(--on-navy)}
.tbl{overflow-x:auto;margin:6px 0 22px;border:1px solid var(--line);border-radius:8px;background:var(--sheet)}
table{border-collapse:collapse;width:100%;font-size:.92rem;min-width:560px}
th,td{text-align:left;padding:11px 14px;border-bottom:1px solid var(--line);vertical-align:top}
th{font-family:var(--mono);font-size:.72rem;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-soft);font-weight:500;background:color-mix(in srgb,var(--paper) 60%,var(--sheet))}
tr:last-child td{border-bottom:0}
td.num{font-variant-numeric:tabular-nums;white-space:nowrap}
.caption{font-size:.8rem;color:var(--ink-soft);margin:-12px 0 22px}
.formula{background:var(--sheet);border:1px solid var(--line);border-radius:8px;padding:18px 20px;margin:4px 0 22px}
.formula code{font-family:var(--mono);font-size:.92rem;display:block;margin-bottom:10px;color:var(--ink)}
.formula p{margin:0;font-size:.95rem}
.callout{background:var(--accent-wash);border-radius:8px;padding:16px 18px;margin:4px 0 22px;font-size:.98rem}
.callout b{font-weight:650}
.bars{display:grid;gap:10px;margin:6px 0 10px}
.bar{display:grid;grid-template-columns:120px 1fr 52px;align-items:center;gap:12px;font-size:.9rem}
.bar i{display:block;height:12px;border-radius:2px;background:var(--line)}
.bar i span{display:block;height:100%;border-radius:2px;background:var(--line-strong)}
.bar.me i span{background:var(--accent)}
.bar.me{font-weight:650}
.bar em{font-style:normal;font-variant-numeric:tabular-nums;text-align:right}
.module{border:1.5px solid var(--ink);border-radius:8px;padding:18px 20px;margin:6px 0 22px;background:var(--sheet)}
.module .label{color:var(--accent-text)}
.module h3{margin:6px 0 8px}
.ladder{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin:6px 0 22px}
.rung{border:1px solid var(--line);border-radius:8px;padding:16px;background:var(--sheet)}
.rung b{display:block;font-family:var(--display);font-stretch:88%;font-size:1.1rem}
.rung .p{font-family:var(--display);font-stretch:85%;font-weight:790;font-size:1.5rem;margin:4px 0}
.rung span{display:block;font-size:.88rem;color:var(--ink-soft);line-height:1.45}
.rung.core{border:1.5px solid var(--accent)}
.faq details{border-bottom:1px solid var(--line);padding:14px 0}
.faq details:first-of-type{border-top:1px solid var(--line)}
.faq summary{cursor:pointer;font-weight:650;list-style:none;display:flex;justify-content:space-between;gap:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--accent-text);font-family:var(--mono)}
.faq details[open] summary::after{content:"–"}
.faq details p{margin:10px 0 0;color:var(--ink-soft)}
.sources{font-size:.82rem;color:var(--ink-soft);padding-left:20px}
.sources li{margin-bottom:6px;word-break:break-word;color:var(--ink-soft)}
.sources a{color:var(--ink-soft)}
.method{font-size:.82rem;color:var(--ink-soft)}
.also{border-top:1px solid var(--line);padding-block:36px}
.also .grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:14px}
.also a{display:block;border:1px solid var(--line);border-radius:8px;padding:14px 16px;text-decoration:none;background:var(--sheet)}
.also a b{display:block;font-family:var(--display);font-stretch:88%;font-size:1.1rem}
.also a span{font-size:.85rem;color:var(--ink-soft)}
.also a:hover{border-color:var(--ink)}
.also a[aria-current]{border-color:var(--accent)}
.endcta{background:var(--navy);color:var(--on-navy);padding-block:48px}
.endcta .wrap{display:flex;flex-wrap:wrap;gap:20px;align-items:center;justify-content:space-between}
.endcta h2{margin:0;color:var(--on-navy);max-width:24ch}
.endcta p{margin:8px 0 0;color:color-mix(in srgb,var(--on-navy) 80%,transparent)}
footer{border-top:1px solid var(--line);padding-block:28px;font-size:.84rem;color:var(--ink-soft)}
footer .wrap{display:flex;flex-wrap:wrap;gap:10px 28px;justify-content:space-between}
footer nav{gap:16px;flex-wrap:wrap;white-space:normal;font-size:.84rem}
footer nav a{display:inline!important}
@media (max-width:980px){.layout{grid-template-columns:1fr;gap:0}aside{position:static;padding-top:24px;order:-1}.toc{display:none}.also .grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:640px){.stats{grid-template-columns:1fr}.ladder{grid-template-columns:1fr}.bar{grid-template-columns:96px 1fr 44px}.also .grid{grid-template-columns:1fr}}