/* ============================================================
   Ballpark — shared site styles (landing page + SEO articles).
   Committed, self-hosted type + neutral palette per the locked hub reference
   (IDENTITY-AND-TRUST.md §2a). Class names are unchanged so every existing page
   inherits the new identity. The lite calculator (calculator.html) stays
   self-contained and does NOT use this.
   ============================================================ */
@font-face{font-family:"Space Grotesk";src:url("/fonts/space-grotesk-700.woff2") format("woff2");font-weight:700;font-display:swap}
@font-face{font-family:"Space Grotesk";src:url("/fonts/space-grotesk-500.woff2") format("woff2");font-weight:500;font-display:swap}
@font-face{font-family:"Plex Sans";src:url("/fonts/plex-sans-400.woff2") format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"Plex Sans";src:url("/fonts/plex-sans-600.woff2") format("woff2");font-weight:600;font-display:swap}
@font-face{font-family:"Plex Mono";src:url("/fonts/plex-mono-400.woff2") format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"Plex Mono";src:url("/fonts/plex-mono-500.woff2") format("woff2");font-weight:500;font-display:swap}

:root{
  --ink:#0a1310;--muted:#53635c;--paper:#f0f2f3;--surface:#ffffff;--line:#dee2e3;--line-2:#c9cfd1;
  --accent:#0f9d6f;--accent-ink:#0a6f4e;--voltage:#c9f24d;--panel-dark:#131415;
  --radius:6px;--shadow:0 1px 2px rgba(10,19,16,.05);
  --display:"Space Grotesk","Segoe UI",system-ui,sans-serif;
  --mono:"Plex Mono",ui-monospace,"Cascadia Mono","Segoe UI Mono",Menlo,Consolas,monospace;
  --sans:"Plex Sans","Segoe UI",system-ui,-apple-system,Roboto,Helvetica,Arial,sans-serif;
}
/* dark: neutral dark grey (no green cast). Auto by OS unless forced light; an
   explicit data-theme toggle wins either way. */
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --ink:#edeef0;--muted:#9a9da1;--paper:#131415;--surface:#1c1d1f;--line:#2a2b2e;--line-2:#3a3c40;
    --accent:#1cbb89;--accent-ink:#5cdaab;--panel-dark:#0e0f10;
    --shadow:0 1px 2px rgba(0,0,0,.4);
  }
}
:root[data-theme="dark"]{
  --ink:#edeef0;--muted:#9a9da1;--paper:#131415;--surface:#1c1d1f;--line:#2a2b2e;--line-2:#3a3c40;
  --accent:#1cbb89;--accent-ink:#5cdaab;--panel-dark:#0e0f10;
  --shadow:0 1px 2px rgba(0,0,0,.4);
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;font-family:var(--sans);color:var(--ink);background:var(--paper);line-height:1.6;font-size:16px;
  -webkit-font-smoothing:antialiased;font-feature-settings:"tnum" 1,"cv05" 1}
.wrap{max-width:1080px;margin:0 auto;padding:0 clamp(18px,4vw,44px)}
.narrow{max-width:760px}
a{color:var(--accent-ink)}

/* accessibility: skip link + visible keyboard focus */
.skip-link{position:absolute;left:12px;top:-52px;z-index:100;background:var(--accent);color:#fff;padding:10px 16px;border-radius:8px;font-weight:700;text-decoration:none;transition:top .15s}
.skip-link:focus{top:12px}
:focus-visible{outline:2.5px solid var(--accent);outline-offset:2px}
a:focus-visible,.btn:focus-visible,summary:focus-visible,button:focus-visible,[tabindex]:focus-visible{outline:2.5px solid var(--accent);outline-offset:2px;border-radius:4px}

h1,h2,h3{font-family:var(--display);font-weight:700}
h2{font-size:clamp(23px,3.6vw,31px);letter-spacing:-.025em;line-height:1.12;margin:0 0 .5em}
h3{font-size:19px;letter-spacing:-.015em;margin:0 0 .35em}
.verified{font-family:var(--mono)}

/* buttons — crisp, not pill-rounded; label reads as the action */
.btn{appearance:none;cursor:pointer;border:none;font-family:var(--sans);font-weight:600;font-size:15px;padding:12px 20px;border-radius:8px;text-decoration:none;display:inline-flex;align-items:center;gap:8px;transition:transform .08s,filter .15s,border-color .15s}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--accent);color:#04120c}
.btn-primary:hover{filter:brightness(1.06)}
.btn-voltage{background:var(--voltage);color:#131415}
.btn-voltage:hover{filter:brightness(1.05)}
.btn-ghost{background:transparent;color:var(--accent-ink);border:1px solid var(--line-2)}
.btn-ghost:hover{border-color:var(--accent)}

/* nav */
nav{position:sticky;top:0;z-index:10;background:color-mix(in srgb,var(--paper) 85%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
nav .row{display:flex;align-items:center;justify-content:space-between;height:62px;gap:16px}
.brand{display:inline-flex;align-items:baseline;gap:9px;font-family:var(--display);font-weight:700;font-size:20px;letter-spacing:-.02em;text-decoration:none;color:var(--ink)}
.brand .mark{font-size:14px;color:var(--accent);transform:translateY(-2px);background:none;width:auto;height:auto;display:inline;place-items:initial;border-radius:0}
nav .links{display:flex;gap:20px;align-items:center;font-family:var(--mono);font-size:12.5px;letter-spacing:.03em;text-transform:uppercase}
nav .links a{color:var(--muted);text-decoration:none;font-weight:400;font-size:12.5px}
nav .links a:hover{color:var(--ink)}
nav .links a.btn{font-family:var(--sans);text-transform:none;letter-spacing:0;color:#04120c}
@media (max-width:640px){nav .row{height:auto;min-height:62px;flex-wrap:wrap;padding:8px 0;column-gap:16px;row-gap:6px}nav .links{gap:14px;flex-wrap:wrap;font-size:11.5px}}

/* dark-mode toggle */
.theme-toggle{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;padding:0;border:1px solid var(--line-2);border-radius:8px;background:var(--surface);color:var(--ink);cursor:pointer;line-height:0}
.theme-toggle:hover{border-color:var(--muted)}
.theme-toggle svg{width:16px;height:16px}
.theme-toggle .i-sun{display:none}.theme-toggle .i-moon{display:block}
:root[data-theme="dark"] .theme-toggle .i-moon{display:none}
:root[data-theme="dark"] .theme-toggle .i-sun{display:block}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]) .theme-toggle .i-moon{display:none}
  :root:not([data-theme="light"]) .theme-toggle .i-sun{display:block}
}

/* hero (landing) — left-aligned, editorial */
.hero{padding:clamp(48px,8vw,104px) 0 clamp(30px,4vw,48px)}
.eyebrow{display:inline-flex;align-items:center;gap:9px;font-family:var(--mono);font-size:12.5px;font-weight:400;letter-spacing:.04em;text-transform:uppercase;color:var(--accent-ink);margin-bottom:22px;background:none;border:none;padding:0;border-radius:0}
.eyebrow::before{content:"";width:24px;height:1px;background:var(--accent)}
.hero h1{font-size:clamp(36px,7vw,68px);line-height:1;letter-spacing:-.035em;margin:0 0 22px;max-width:17ch}
.hero p.lede{color:var(--muted);font-size:clamp(17px,2.4vw,22px);max-width:52ch;margin:0 0 26px;line-height:1.42}
.hero p.lede b{color:var(--ink);font-weight:600}
.hero .cta{display:flex;gap:12px;flex-wrap:wrap}
.trust{margin-top:26px;color:var(--muted);font-size:12.5px;font-family:var(--mono);display:flex;gap:26px;flex-wrap:wrap;letter-spacing:.02em}
.trust b{color:var(--ink);font-weight:500}

/* generic sections */
section{padding:clamp(34px,5vw,60px) 0}
.section-head{max-width:60ch;margin:0 0 clamp(24px,4vw,36px)}
.section-head h2{margin-bottom:.25em}
.section-head p{color:var(--muted);font-size:17px;margin:0}
#calculator{padding-top:8px}
.calc-frame{width:100%;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);background:var(--surface);display:block;min-height:900px;overflow:hidden}

/* value-prop cards — flat, hairline, no emoji chrome */
.cards3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
@media (max-width:760px){.cards3{grid-template-columns:1fr}}
.vp{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.vp .ic{font-family:var(--mono);font-size:12px;letter-spacing:.05em;text-transform:uppercase;color:var(--accent-ink);width:auto;height:auto;background:none;display:block;margin-bottom:12px;border-radius:0}
.vp h3{margin-bottom:.4em}
.vp p{color:var(--muted);margin:0;font-size:15px}

/* ledger — hairline rows that route to a set of things (breaks the card-triad) */
.ledger{border-top:1px solid var(--ink)}
.ledger .lrow{display:grid;grid-template-columns:minmax(58px,auto) minmax(0,1fr) auto;gap:clamp(16px,3.4vw,44px);align-items:center;padding:clamp(22px,3vw,30px) 4px;border-bottom:1px solid var(--line);text-decoration:none;color:inherit;transition:background .14s,padding .14s}
.ledger a.lrow:hover{background:var(--surface);padding-left:16px;padding-right:16px}
.ledger .lkey{font-family:var(--mono);font-size:12px;letter-spacing:.05em;text-transform:uppercase;color:var(--accent-ink)}
.ledger .lname{display:block;font-family:var(--display);font-weight:700;font-size:clamp(20px,2.7vw,27px);letter-spacing:-.02em;line-height:1;margin-bottom:9px}
.ledger .ldesc{display:block;color:var(--muted);font-size:15px;line-height:1.5;max-width:56ch}
.ledger .lgo{font-family:var(--mono);font-size:12.5px;color:var(--accent-ink);white-space:nowrap;align-self:center}
.ledger a.lrow:hover .lgo{color:var(--accent)}
@media (max-width:680px){
  .ledger .lrow{grid-template-columns:1fr auto;grid-template-areas:"key go" "body body";row-gap:12px;column-gap:16px;align-items:center}
  .ledger .lkey{grid-area:key}.ledger .lbody{grid-area:body}.ledger .lgo{grid-area:go}
  .ledger a.lrow:hover{padding-left:4px;padding-right:4px}
}

/* email capture (retained for completeness; not used — no email capture) */
.capture{background:var(--panel-dark);color:#eaf3ef;border-radius:var(--radius);padding:clamp(26px,4vw,44px);text-align:center;box-shadow:var(--shadow)}
.capture h2{color:#fff}
.capture p{color:#b9c8c1;max-width:52ch;margin:0 auto 22px;font-size:16px}
form.signup{display:flex;gap:10px;max-width:480px;margin:0 auto;flex-wrap:wrap;justify-content:center}
form.signup input[type=email]{flex:1;min-width:220px;font:inherit;padding:13px 15px;border-radius:8px;border:1px solid #2c3c38;background:#0a1412;color:#fff}
form.signup input[type=email]:focus-visible{border-color:var(--voltage);box-shadow:0 0 0 3px rgba(201,242,77,.35)}
.signup-msg{margin-top:14px;font-size:14px;min-height:1.2em}
.signup-msg.ok{color:var(--voltage)}
.signup-msg.err{color:#ff9b85}
.capture small{display:block;margin-top:14px;color:#7e918a;font-size:12.5px}

/* paid block */
.paid{display:grid;grid-template-columns:1.1fr .9fr;gap:28px;align-items:center;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:clamp(24px,4vw,40px);box-shadow:var(--shadow)}
@media (max-width:760px){.paid{grid-template-columns:1fr}}
.paid ul{list-style:none;padding:0;margin:0 0 22px;display:grid;gap:10px}
.paid li{display:flex;gap:10px;align-items:flex-start;font-size:15.5px}
.paid li .ck{color:var(--accent);font-weight:800;flex:none}
.price{display:flex;align-items:baseline;gap:8px;margin-bottom:6px}
.price .amt{font-family:var(--mono);font-size:40px;font-weight:500;letter-spacing:-.02em}
.price .cur{color:var(--muted);font-weight:500;font-family:var(--mono)}
.paid .panel{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:24px;text-align:center}
.paid .panel .sub{color:var(--muted);font-size:13.5px;margin:2px 0 18px}
.paid .panel .btn{width:100%;justify-content:center;margin-bottom:10px}
.guarantee{color:var(--muted);font-size:12.5px;margin-top:6px}

/* faq / accordion */
.faq details{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);margin-bottom:12px;overflow:hidden}
.faq summary{cursor:pointer;padding:18px 20px;font-weight:600;font-size:16.5px;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--accent);font-size:22px;font-weight:400;line-height:1;font-family:var(--mono)}
.faq details[open] summary::after{content:"–"}
.faq .ans{padding:0 20px 18px;color:var(--muted);font-size:15.5px}
.faq .ans p{margin:0 0 .6em}

/* ============================================================
   Article / cornerstone page styles
   ============================================================ */
.crumbs{font-size:12.5px;font-family:var(--mono);color:var(--muted);padding:18px 0 0}
.crumbs a{text-decoration:none}
.crumbs a:hover{text-decoration:underline}

article.post{padding:18px 0 10px}
article.post header.head{margin-bottom:26px}
article.post .kicker{font-family:var(--mono);font-size:12.5px;font-weight:400;letter-spacing:.05em;text-transform:uppercase;color:var(--accent-ink);margin:0 0 12px}
article.post h1{font-size:clamp(30px,5.4vw,46px);line-height:1.05;letter-spacing:-.03em;margin:0 0 .35em}
article.post .standfirst{color:var(--muted);font-size:clamp(16px,2.3vw,20px);margin:0;line-height:1.45}
article.post .meta{margin-top:16px;font-size:12.5px;font-family:var(--mono);color:var(--muted)}

.prose{font-size:17px;line-height:1.7}
.prose h2{margin:1.6em 0 .5em}
.prose h3{font-size:20px;margin:1.4em 0 .4em}
.prose p{margin:0 0 1.05em}
.prose ul,.prose ol{margin:0 0 1.1em;padding-left:1.3em}
.prose li{margin:.3em 0}
.prose strong{color:var(--ink)}
.prose a{font-weight:600}
.affiliate-note{font-size:13px;color:var(--muted)}

/* key takeaways box */
.takeaways{background:var(--surface);border:1px solid var(--line);border-left:3px solid var(--accent);border-radius:var(--radius);padding:20px 22px;margin:0 0 28px;box-shadow:var(--shadow)}
.takeaways h2{font-family:var(--mono);font-weight:500;font-size:12.5px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin:0 0 12px}
.takeaways ul{margin:0;padding-left:1.2em}
.takeaways li{margin:.35em 0;font-size:15.5px}

/* data table */
.tbl{width:100%;border-collapse:collapse;margin:0 0 1.4em;font-size:15.5px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.tbl th,.tbl td{padding:11px 14px;text-align:left;border-bottom:1px solid var(--line)}
.tbl th{background:var(--paper);font-family:var(--mono);font-size:12px;font-weight:500;text-transform:uppercase;letter-spacing:.04em;color:var(--muted)}
.tbl tr:last-child td{border-bottom:none}
.tbl td.num,.tbl th.num{text-align:right;font-family:var(--mono)}
.tbl tfoot td,.tbl .total td{font-weight:700}

/* callout note */
.callout{border-radius:var(--radius);padding:16px 18px;margin:0 0 1.4em;font-size:15px}
.callout.info{background:color-mix(in srgb,var(--accent) 8%,transparent);border:1px solid color-mix(in srgb,var(--accent) 30%,transparent);color:var(--accent-ink)}
.callout.warn{background:rgba(180,83,42,.08);border:1px solid rgba(180,83,42,.28);color:#9c4527}
.callout b{color:inherit}

/* inline CTA banner */
.cta-banner{background:var(--panel-dark);color:#eaf3ef;border-radius:var(--radius);padding:24px clamp(20px,3vw,32px);margin:30px 0;display:flex;gap:20px;align-items:center;justify-content:space-between;flex-wrap:wrap;box-shadow:var(--shadow)}
.cta-banner .t{margin:0;font-family:var(--display);font-weight:700;font-size:19px;color:#fff}
.cta-banner .s{margin:4px 0 0;color:#b9c8c1;font-size:14.5px}
.cta-banner .btn{flex:none}

/* related links */
.related{margin:34px 0 10px}
.related h2{font-size:19px;margin-bottom:14px}
.related .grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media (max-width:600px){.related .grid{grid-template-columns:1fr}}
.related a.card{display:block;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px;text-decoration:none;color:var(--ink);box-shadow:var(--shadow);transition:border-color .15s}
.related a.card:hover{border-color:var(--accent)}
.related a.card .h{font-family:var(--display);font-weight:700;margin-bottom:3px}
.related a.card .d{color:var(--muted);font-size:13.5px}

/* footer */
footer{border-top:1px solid var(--line);margin-top:20px;padding:30px 0;color:var(--muted);font-size:12.5px;font-family:var(--mono);letter-spacing:.02em}
footer .row{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}

/* respect reduced-motion preference */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important;scroll-behavior:auto!important}
}