/* ============================================================
   WattSpend — design system (static build)
   Source of truth: handoff tokens.css + component styles.
   Semantic color rule: GREEN = money saved · AMBER = money spent.
   ============================================================ */

:root {
  /* Navy · primary / trust */
  --navy-950:#0B1426; --navy-800:#16233D; --navy-700:#22345A;
  --navy-600:#2E4674; --navy-100:#DCE4F2; --navy-50:#EEF2F9;
  /* Volt / green · savings */
  --volt-500:#2EE08A; --volt-600:#1BC474; --green-700:#0A7C4A;
  --green-800:#075E39; --green-200:#A9EBCB; --green-50:#E9FBF2;
  --focus-ring:rgba(46,224,138,0.4); --focus-border:#0FA35E;
  /* Amber · costs · affiliate */
  --amber-400:#ECB84A; --amber-600:#D28A0F; --amber-700:#B4710E;
  --amber-800:#8F5F0A; --amber-900:#6E4B08; --amber-200:#EDD9A4; --amber-50:#FCF4E4;
  /* Red · errors */
  --red-700:#B42318; --red-200:#F0B9AF; --red-50:#FBEAE7;
  /* Warm gray · text / surfaces */
  --gray-800:#3E3B31; --gray-600:#6C665A; --gray-500:#6E6858; --gray-400:#A39D8D;
  --gray-300:#C9C2B0; --gray-200:#E7E2D8; --gray-150:#F0EDE4; --gray-100:#F5F2EA;
  --bg:#FAF9F4; --white:#FFFFFF;
  --on-navy:#FFFFFF; --on-navy-muted:#B9C2D4; --on-navy-faint:#8593AC;
  /* Type */
  --font:'Public Sans',system-ui,-apple-system,'Segoe UI',Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  /* Space */
  --sp-1:4px; --sp-2:8px; --sp-3:12px; --sp-4:16px; --sp-6:24px; --sp-8:32px; --sp-12:48px; --sp-16:64px;
  /* Radius */
  --r-input:8px; --r-card:12px; --r-card-lg:14px; --r-pill:999px;
  /* Shadow */
  --shadow-card:0 1px 2px rgba(22,35,61,0.06),0 1px 3px rgba(22,35,61,0.06);
  --shadow-raised:0 8px 24px rgba(22,35,61,0.14);
  --shadow-sticky:0 -6px 16px rgba(22,35,61,0.08);
  /* Layout */
  --content-max:1120px; --article-max:900px; --nav-h:64px; --touch-min:44px;
}

*,*::before,*::after{box-sizing:border-box}
html{background:var(--bg);-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;font-family:var(--font);font-size:16.5px;line-height:1.65;
  color:var(--gray-800);background:var(--bg);-webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto}
h1,h2,h3,h4{color:var(--navy-800);text-wrap:balance;margin:0}
h1{font-size:36px;font-weight:800;letter-spacing:-0.02em;line-height:1.15}
h2{font-size:26px;font-weight:750;letter-spacing:-0.015em;line-height:1.25}
h3{font-size:19px;font-weight:700;line-height:1.35}
p{margin:0}
a{color:var(--navy-600);text-decoration:none}
a:hover{text-decoration:underline}
.num,.stat,td.num{font-variant-numeric:tabular-nums;font-feature-settings:'tnum'}
:focus-visible{outline:2px solid var(--navy-800);outline-offset:2px;border-color:var(--focus-border);box-shadow:0 0 0 3px var(--focus-ring)}
a:focus-visible,button:focus-visible,summary:focus-visible{outline:2px solid var(--navy-800);outline-offset:2px}
input:focus-visible,select:focus-visible{outline:2px solid var(--focus-border);outline-offset:1px}
input[type="range"],input[type="checkbox"]{accent-color:var(--focus-border)}
.tnum{font-variant-numeric:tabular-nums;font-feature-settings:'tnum'}
.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip-link{position:absolute;left:-999px;top:0;background:var(--navy-800);color:#fff;padding:10px 16px;border-radius:0 0 8px 0;z-index:100}
.skip-link:focus{left:0}

/* ---------- Layout ---------- */
.container{max-width:var(--content-max);margin:0 auto;padding:0 40px}
.article{max-width:var(--article-max);margin:0 auto;padding:0 40px}
main{display:block}
.section{padding-top:52px}
.section-tight{padding-top:36px}
.lede{font-size:17.5px;line-height:1.6;color:var(--gray-600)}
.muted{color:var(--gray-600)}
.faint{color:var(--gray-500)}
.measure{max-width:720px}

/* ---------- Top nav ---------- */
.nav{position:sticky;top:0;z-index:50;background:var(--white);border-bottom:1px solid var(--gray-200)}
.nav-inner{max-width:1200px;margin:0 auto;padding:0 40px;height:64px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;flex:none}
.brand:hover{text-decoration:none}
.brand-tile{width:28px;height:28px;display:inline-flex;border-radius:8px;background:var(--navy-800);align-items:center;justify-content:center;flex:none}
.brand-name{font-size:19px;font-weight:800;letter-spacing:-0.02em;color:var(--navy-800)}
.nav-links{display:flex;align-items:center;gap:6px}
.nav-link{display:inline-flex;align-items:center;gap:5px;padding:9px 12px;border-radius:8px;font-size:15px;font-weight:600;color:#57534A;text-decoration:none}
.nav-link:hover{background:var(--gray-100);color:var(--navy-800);text-decoration:none}
.nav-link.is-active{font-weight:750;color:var(--navy-800);box-shadow:inset 0 -3px 0 var(--volt-500)}
.nav-has-menu{position:relative}
.nav-dropdown{position:absolute;top:52px;right:0;width:560px;max-width:calc(100vw - 32px);background:var(--white);border:1px solid var(--gray-200);border-radius:14px;box-shadow:0 16px 40px rgba(22,35,61,0.16);padding:12px;display:grid;grid-template-columns:1fr 1fr;gap:2px;z-index:40;opacity:0;visibility:hidden;transform:translateY(-6px);transition:opacity .14s,transform .14s,visibility .14s}
.nav-has-menu:hover .nav-dropdown,.nav-has-menu:focus-within .nav-dropdown{opacity:1;visibility:visible;transform:translateY(0)}
.nav-dd-item{display:flex;align-items:flex-start;gap:10px;padding:10px;border-radius:10px;text-decoration:none}
.nav-dd-item:hover{background:var(--gray-100);text-decoration:none}
.nav-dd-ic{width:30px;height:30px;flex:none;border-radius:8px;background:var(--green-50);display:inline-flex;align-items:center;justify-content:center;color:var(--green-700)}
.nav-dd-name{display:block;font-size:14px;font-weight:700;color:var(--navy-800);line-height:1.3}
.nav-dd-sub{display:block;font-size:12px;color:var(--gray-500);line-height:1.4;margin-top:1px}
.nav-mobile-btn{display:none;width:44px;height:44px;border:none;background:transparent;align-items:center;justify-content:center;border-radius:10px;cursor:pointer}
.nav-mobile-btn:hover{background:var(--gray-100)}
/* mobile sheet */
.nav-sheet{display:none;position:fixed;inset:0;z-index:60;background:var(--white);flex-direction:column;overflow-y:auto}
.nav-sheet.is-open{display:flex}
body.sheet-open{overflow:hidden}
.nav-sheet-head{padding:0 12px 0 16px;height:56px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--gray-200)}
.nav-sheet-nav{padding:8px 16px;display:flex;flex-direction:column}
.nav-sheet-nav a{display:flex;align-items:center;justify-content:space-between;padding:16px 4px;font-size:20px;font-weight:750;color:var(--navy-800);text-decoration:none;border-bottom:1px solid var(--gray-150)}
.nav-sheet-nav a:last-child{border-bottom:none}
.nav-sheet-pop{margin:8px 16px 0;padding:14px 16px;background:var(--gray-100);border-radius:12px}
.nav-sheet-foot{margin-top:auto;padding:20px 16px;font-size:12.5px;color:var(--gray-500)}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:50px;padding:0 24px;border-radius:10px;font-family:inherit;font-size:16px;font-weight:750;text-decoration:none;cursor:pointer;border:none;line-height:1}
.btn:hover{text-decoration:none}
.btn-primary{background:var(--volt-500);color:var(--navy-950)}
.btn-primary:hover{background:var(--volt-600)}
.btn-secondary{background:var(--white);border:1px solid var(--gray-300);color:var(--navy-800);font-size:15px;font-weight:700}
.btn-secondary:hover{background:var(--gray-100)}
.btn-navy{background:var(--navy-800);color:#fff;font-size:14.5px;font-weight:700;height:46px}
.btn-navy:hover{background:var(--navy-700)}
.btn-affiliate{background:var(--amber-700);color:#fff;font-size:13.5px;font-weight:700;height:40px;padding:0 16px;border-radius:8px}
.btn-affiliate:hover{background:var(--amber-800)}
.btn-sm{height:40px;font-size:14px;padding:0 18px}
.btn-block{width:100%}

/* ---------- Chips / badges ---------- */
.pill{display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:700;border-radius:var(--r-pill);padding:4px 11px}
.pill-updated{color:var(--green-700);background:var(--white);border:1px solid var(--green-200)}
.pill-updated .dot{width:7px;height:7px;border-radius:var(--r-pill);background:var(--volt-500)}
.badge{font-size:10px;font-weight:800;letter-spacing:0.08em;border-radius:var(--r-pill);padding:2px 8px}
.badge-flagship{color:var(--green-700);background:var(--green-50);border:1px solid var(--green-200)}
.badge-pick{color:var(--amber-800);background:var(--amber-50);border:1px solid var(--amber-200)}
.kicker{font-size:11.5px;font-weight:700;letter-spacing:0.07em;text-transform:uppercase;color:var(--green-700)}
.label-caps{font-size:12px;font-weight:700;letter-spacing:0.08em;text-transform:uppercase;color:var(--gray-600)}
.spec-chip{font-size:12.5px;font-weight:700;color:var(--navy-800);background:var(--white);border:1px solid var(--gray-200);border-radius:var(--r-pill);padding:6px 12px}

/* ---------- Breadcrumb ---------- */
.crumbs{display:flex;align-items:center;gap:7px;font-size:13px;flex-wrap:wrap}
.crumbs a{color:var(--gray-600)}
.crumbs .sep{color:var(--gray-300)}
.crumbs .here{color:var(--gray-800);font-weight:600}

/* ---------- Cards ---------- */
.card{background:var(--white);border:1px solid var(--gray-200);border-radius:var(--r-card);padding:18px;text-decoration:none;display:block}
a.card:hover{border-color:var(--volt-500);box-shadow:var(--shadow-raised);text-decoration:none}
.card-ic{width:36px;height:36px;border-radius:10px;background:var(--green-50);display:inline-flex;align-items:center;justify-content:center;color:var(--green-700)}
.card-title{display:block;margin-top:12px;font-size:15.5px;font-weight:700;color:var(--navy-800);line-height:1.3}
.card-sub{display:block;margin-top:4px;font-size:13px;line-height:1.5;color:var(--gray-600)}
.grid{display:grid;gap:14px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.tools-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}

/* ---------- Callouts ---------- */
.answer{background:var(--green-50);border:1px solid var(--green-200);border-left:4px solid var(--volt-500);border-radius:10px;padding:18px 22px}
.answer .kicker{margin-bottom:8px;display:flex;align-items:center;gap:7px}
.answer p{font-size:17px;line-height:1.6;color:#1F2A40}
.answer b{color:var(--green-800)}
.note{background:var(--amber-50);border:1px solid var(--amber-200);border-radius:10px;padding:14px 18px;display:flex;gap:11px}
.note p{font-size:14px;line-height:1.6;color:var(--amber-900);margin:0}
.callout-save{background:var(--green-50);border:1px solid var(--green-200);border-radius:12px;padding:14px 18px;display:flex;align-items:center;gap:12px}
.callout-save p{margin:0;font-size:15px;line-height:1.5;color:var(--green-800)}
.callout-cost{background:var(--amber-50);border:1px solid var(--amber-200);border-radius:12px;padding:14px 18px}
.callout-cost p{margin:0;font-size:15px;line-height:1.5;color:var(--amber-900)}
.info-strip{background:var(--white);border:1px solid var(--gray-200);border-radius:12px;padding:18px 22px;display:flex;gap:12px}
.info-strip p{margin:0;font-size:14.5px;line-height:1.65;color:var(--gray-800)}

/* ---------- Formula / mono block ---------- */
.formula{background:var(--gray-100);border:1px solid var(--gray-200);border-radius:10px;padding:16px 20px;font-family:var(--mono);font-size:14px;line-height:1.9;color:var(--gray-800)}
.formula .op{color:var(--gray-500)}

/* ---------- Tables ---------- */
.table-wrap{border:1px solid var(--gray-200);border-radius:var(--r-card);overflow:hidden;background:var(--white)}
.table-scroll{overflow-x:auto}
table.data{width:100%;border-collapse:collapse}
table.data th{text-align:left;padding:11px 18px;font-size:11.5px;font-weight:700;letter-spacing:0.07em;text-transform:uppercase;color:var(--gray-600);background:var(--gray-100);border-bottom:1px solid var(--gray-200)}
table.data th.r,table.data td.r{text-align:right}
table.data td{padding:11px 18px;font-size:14.5px;color:var(--gray-800);border-bottom:1px solid var(--gray-150)}
table.data tr:last-child td{border-bottom:none}
table.data tbody tr:nth-child(even){background:var(--bg)}
table.data td.name{font-weight:650}
table.data td.name a{color:var(--navy-600)}
table.data td.strong{font-weight:750;color:var(--navy-800)}
table.data tr.total td{font-weight:800;color:var(--navy-800);font-size:15px}
.cost-pos{color:var(--green-700)} .cost-neg{color:var(--amber-800)}

/* ---------- FAQ accordion (zero-JS) ---------- */
.faq{border:1px solid var(--gray-200);border-radius:var(--r-card);overflow:hidden;background:var(--white)}
.faq details{border-bottom:1px solid var(--gray-150)}
.faq details:last-child{border-bottom:none}
.faq summary{list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:16px 20px;font-size:16px;font-weight:650;color:var(--navy-800)}
.faq summary::-webkit-details-marker{display:none}
.faq .pm{width:26px;height:26px;flex:none;border-radius:var(--r-pill);border:1.5px solid var(--gray-300);display:inline-flex;align-items:center;justify-content:center;font-size:15px;font-weight:700;color:var(--gray-600);line-height:1}
.faq details[open] .plus{display:none}
.faq .minus{display:none}
.faq details[open] .minus{display:inline}
.faq .faq-a{margin:0;padding:0 20px 16px;font-size:15px;line-height:1.65;color:var(--gray-800);max-width:720px}
.faq .faq-a a{text-decoration:underline;text-underline-offset:2px}

/* ---------- Sources box ---------- */
.sources{background:var(--gray-100);border:1px solid var(--gray-200);border-radius:var(--r-card);padding:18px 22px}
.sources-head{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.sources p{margin:10px 0 0;font-size:13.5px;line-height:1.65;color:var(--gray-800)}

/* ---------- Calculator ---------- */
.calc{background:var(--white);border:1px solid var(--gray-200);border-radius:var(--r-card-lg);box-shadow:var(--shadow-card);padding:32px}
.calc-embed{box-shadow:var(--shadow-raised)}
.calc-grid{display:grid;grid-template-columns:1.02fr 0.98fr;gap:0}
.calc-inputs{padding-right:32px;display:flex;flex-direction:column;gap:18px;min-width:0}
.calc-results{border-left:1px solid var(--gray-200);padding-left:32px;display:flex;flex-direction:column;gap:14px;min-width:0}
.calc-head{display:flex;align-items:center;justify-content:space-between;gap:12px}
.field{display:block}
.field > label,.field-label{display:block;font-size:14px;font-weight:600;color:var(--gray-800);margin-bottom:6px}
.field-hint{margin-top:6px;font-size:12.5px;color:var(--gray-600)}
.field-hint a{text-decoration:underline;text-underline-offset:2px}
.grid-fields{display:grid;grid-template-columns:1fr 1fr;gap:14px}
select.control,input.control{width:100%;height:48px;border:1px solid var(--gray-300);border-radius:var(--r-input);background:var(--white);padding:0 14px;font-family:inherit;font-size:15.5px;font-weight:600;color:var(--navy-800);font-variant-numeric:tabular-nums}
select.control{appearance:none;-webkit-appearance:none;padding-right:40px;
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'><path d='M2.5 4.5 6 8l3.5-3.5' fill='none' stroke='%236C665A' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/></svg>");background-repeat:no-repeat;background-position:right 14px center}
select.control:focus-visible,input.control:focus-visible{border-color:var(--focus-border);box-shadow:0 0 0 3px var(--focus-ring)}
.input-group{display:flex;align-items:stretch;height:48px;border:1px solid var(--gray-300);border-radius:var(--r-input);background:var(--white);overflow:hidden}
.input-group.edited{border-color:var(--focus-border)}
.input-group input{flex:1;min-width:0;width:100%;border:none;outline:none;padding:0 14px;font-family:inherit;font-size:16.5px;font-weight:600;color:var(--navy-800);font-variant-numeric:tabular-nums;background:transparent}
.input-group .unit{display:flex;align-items:center;padding:0 13px;background:var(--gray-100);border-left:1px solid var(--gray-200);font-size:13.5px;font-weight:600;color:var(--gray-600)}
.input-group .unit.pre{border-left:none;border-right:1px solid var(--gray-200)}
.input-group.edited .unit{background:var(--green-50);border-color:var(--green-200);color:var(--green-700)}
.range-row{display:flex;align-items:center;gap:14px}
.range-row input[type=range]{flex:1;accent-color:var(--focus-border);height:24px}
.range-num{display:flex;align-items:stretch;height:44px;width:118px;border:1px solid var(--gray-300);border-radius:var(--r-input);background:var(--white);overflow:hidden;flex:none}
.range-num input{flex:1;min-width:0;width:100%;border:none;outline:none;padding:0 10px;font-family:inherit;font-size:15.5px;font-weight:700;color:var(--navy-800);font-variant-numeric:tabular-nums;background:transparent;text-align:right}
.range-num .unit{display:flex;align-items:center;padding:0 9px;background:var(--gray-100);border-left:1px solid var(--gray-200);font-size:12.5px;font-weight:600;color:var(--gray-600)}
/* segmented control */
.segmented{display:flex;background:var(--gray-150);border-radius:var(--r-pill);padding:3px;gap:2px}
.segmented.four{display:grid;grid-template-columns:repeat(4,1fr);border-radius:10px}
.segmented button{flex:1;border:none;cursor:pointer;font-family:inherit;text-align:center;padding:10px 0;border-radius:var(--r-pill);background:transparent;font-size:14px;font-weight:600;color:var(--gray-600);line-height:1.2}
.segmented.four button{border-radius:8px;padding:10px 2px;font-size:13px}
.segmented button.on{background:var(--white);box-shadow:0 1px 3px rgba(22,35,61,0.14);color:var(--navy-800);font-weight:750}
.subpanel{background:var(--bg);border:1px solid var(--gray-200);border-radius:10px;padding:14px 16px}
/* results */
.result-cards{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.rcard{border-radius:var(--r-card);padding:16px 18px}
.rcard-white{background:var(--white);border:1px solid var(--gray-200)}
.rcard-navy{background:var(--navy-800)}
.rcard .rc-label{font-size:11.5px;font-weight:700;letter-spacing:0.07em;text-transform:uppercase;color:var(--gray-600)}
.rcard-navy .rc-label{color:var(--on-navy-faint)}
.rcard .rc-stat{margin-top:5px;font-size:33px;font-weight:800;letter-spacing:-0.01em;color:var(--navy-800);font-variant-numeric:tabular-nums;line-height:1.05}
.rcard-navy .rc-stat{color:var(--volt-500)}
.rcard .rc-sub{margin-top:4px;font-size:12.5px;color:var(--gray-600);font-variant-numeric:tabular-nums}
.rcard-navy .rc-sub{color:var(--on-navy-muted)}
.rc-stat.cost{color:var(--amber-400)}
/* comparison bars */
.bars .bar-row{display:flex;justify-content:space-between;margin-bottom:5px}
.bars .bar-lbl{font-size:13.5px;font-weight:700;color:var(--navy-800)}
.bars .bar-val{font-size:13.5px;font-weight:800;font-variant-numeric:tabular-nums}
.bar-track{height:22px;background:var(--gray-100);border-radius:6px;overflow:hidden;margin-bottom:12px}
.bar-track:last-child{margin-bottom:0}
.bar-fill{height:100%}
.bar-fill.ev{background:var(--volt-500)} .bar-fill.gas{background:var(--amber-400)}
/* breakdown ledger */
.ledger{background:var(--bg);border:1px solid var(--gray-150);border-radius:var(--r-card);padding:4px 18px}
.ledger .row{display:flex;justify-content:space-between;gap:12px;padding:9px 0;border-bottom:1px solid var(--gray-150)}
.ledger .row:last-child{border-bottom:none}
.ledger .row .k{font-size:14px;color:var(--gray-800)}
.ledger .row .v{font-size:14px;font-weight:700;font-variant-numeric:tabular-nums}
.ledger .row.total .k{font-weight:750;color:var(--navy-800);font-size:15px}
.ledger .row.total .v{font-weight:800;color:var(--navy-800);font-size:16px}
details.advanced{border:1px solid var(--gray-200);border-radius:10px;background:var(--bg)}
details.advanced summary{list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:10px;padding:12px 16px;font-size:13.5px;font-weight:600;color:var(--navy-600)}
details.advanced summary::-webkit-details-marker{display:none}
details.advanced .chev{transition:transform .15s}
details.advanced[open] .chev{transform:rotate(180deg)}
.advanced-body{padding:2px 16px 14px}

/* ---------- Author byline ---------- */
.byline{margin-top:14px;display:flex;align-items:center;gap:12px;padding-bottom:18px;border-bottom:1px solid var(--gray-200)}
.avatar{width:38px;height:38px;border-radius:var(--r-pill);background:var(--navy-800);color:var(--volt-500);display:inline-flex;align-items:center;justify-content:center;font-size:14px;font-weight:800;flex:none}
.byline-name{font-size:13.5px;font-weight:700;color:var(--navy-800)}
.byline-meta{font-size:12.5px;color:var(--gray-500)}
.author-box{background:var(--gray-100);border:1px solid var(--gray-200);border-radius:var(--r-card);padding:18px 22px;display:flex;gap:14px;align-items:flex-start}

/* ---------- Guide layout ---------- */
.guide-grid{display:grid;grid-template-columns:1fr 300px;gap:40px;align-items:start}
.guide-body{min-width:0}
.guide-body h2{margin-top:36px}
.guide-body h3{margin-top:18px}
.guide-body p{margin-top:12px;line-height:1.7}
.guide-body p:first-child{margin-top:0}
.toc{position:sticky;top:88px;display:flex;flex-direction:column;gap:16px}
.toc-card{background:var(--white);border:1px solid var(--gray-200);border-radius:var(--r-card);padding:18px 20px}
.toc-card .label-caps{margin-bottom:10px}
.toc-links{display:flex;flex-direction:column}
.toc-links a{padding:7px 0 7px 12px;border-left:2px solid var(--gray-150);font-size:13.5px;color:var(--gray-600);text-decoration:none}
.toc-links a:hover{color:var(--navy-800);border-left-color:var(--gray-300);text-decoration:none}
.toc-links a.active{border-left-color:var(--volt-500);font-weight:700;color:var(--navy-800)}
.toc-cta{background:var(--navy-800);border-radius:var(--r-card);padding:18px 20px}
.toc-cta-title{font-size:14px;font-weight:750;color:#fff;line-height:1.4}
.affiliate-block{background:var(--white);border:1px solid var(--gray-200);border-radius:var(--r-card);padding:16px 18px;display:flex;gap:16px;align-items:center;position:relative}
.affiliate-block .badge-pick{position:absolute;top:-9px;left:16px}
.affiliate-ic{width:72px;height:72px;flex:none;border-radius:10px;background:var(--gray-100);border:1px solid var(--gray-200);display:inline-flex;align-items:center;justify-content:center}
.disclosure{font-size:11.5px;color:var(--gray-500)}

/* ---------- Ad slots (reserve height, no CLS) ---------- */
.ad{box-sizing:border-box;border:1.5px dashed #D3CCBB;background:var(--gray-100);border-radius:6px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;margin:0 auto;color:var(--gray-500)}
.ad .ad-tag{font-size:10px;font-weight:800;letter-spacing:0.14em;color:var(--gray-600);border:1px solid var(--gray-300);border-radius:var(--r-pill);padding:3px 8px;background:var(--white)}
.ad-note{font-size:12px;font-weight:500}
.ad-leader{width:728px;max-width:100%;height:90px;flex-direction:row;gap:10px}
.ad-rect{width:336px;max-width:100%;height:280px}
.ad-banner{width:320px;max-width:100%;height:100px}
.ad-holder{display:flex;justify-content:center;padding:28px 0}
.ad-sticky{position:fixed;left:0;right:0;bottom:0;z-index:45;width:100%;background:var(--white);border-top:1px solid var(--gray-200);box-shadow:var(--shadow-sticky);padding:8px 12px calc(14px + env(safe-area-inset-bottom));display:none}
.ad-sticky .ad{width:320px;height:50px;flex-direction:row;gap:8px}
.ad-sticky-close{position:absolute;top:6px;right:8px;width:22px;height:22px;border:1px solid #D8D2C4;border-radius:var(--r-pill);background:var(--white);display:flex;align-items:center;justify-content:center;font-size:11px;color:var(--gray-600);line-height:1;cursor:pointer}

/* ---------- Footer ---------- */
.footer{background:var(--navy-950);color:var(--on-navy-muted);margin-top:56px}
.footer-inner{max-width:1200px;margin:0 auto;padding:48px 40px 32px}
.footer-cols{display:grid;grid-template-columns:1.4fr 1fr 0.9fr 1.1fr 1fr;gap:32px}
.footer h4{font-size:11.5px;font-weight:700;letter-spacing:0.08em;text-transform:uppercase;color:var(--on-navy-faint);margin-bottom:12px}
.footer-brand-tile{width:26px;height:26px;display:inline-flex;border-radius:7px;background:var(--volt-500);align-items:center;justify-content:center}
.footer-brand-name{font-size:17px;font-weight:800;letter-spacing:-0.02em;color:#fff}
.footer p.blurb{margin:12px 0 0;font-size:13.5px;line-height:1.6;color:var(--on-navy-faint);max-width:230px}
.footer-links{display:flex;flex-direction:column;gap:9px}
.footer-links a{font-size:13.5px;color:var(--on-navy-muted);text-decoration:none}
.footer-links a:hover{color:var(--volt-500);text-decoration:none}
.footer-links a.more{font-weight:600;color:var(--volt-500)}
.footer-bottom{margin-top:36px;padding-top:20px;border-top:1px solid #1E2C49;display:flex;flex-wrap:wrap;gap:8px 24px;align-items:baseline;justify-content:space-between}
.footer-bottom p{margin:0;font-size:12.5px;line-height:1.6;color:var(--on-navy-faint);max-width:640px}
.footer-bottom .copy{font-size:12.5px;color:var(--on-navy-faint)}

/* ---------- Hero ---------- */
.hero{text-align:center;padding-top:44px}
.hero h1{margin:0 auto;font-size:38px;max-width:760px}
.hero .lede{margin:14px auto 0;max-width:620px}
.hero-cta{margin-top:22px;display:flex;justify-content:center;gap:12px;flex-wrap:wrap}
.hero-trust{margin-top:14px;font-size:13px;color:var(--gray-500)}

/* trust strip */
.trust-strip{background:var(--navy-50);border:1px solid var(--navy-100);border-radius:var(--r-card-lg);padding:24px 28px;display:grid;grid-template-columns:1fr 1fr 1fr;gap:24px}
.trust-item{display:flex;gap:12px}
.trust-ic{width:36px;height:36px;flex:none;border-radius:10px;background:var(--navy-800);display:inline-flex;align-items:center;justify-content:center;color:#fff}
.trust-item .t{font-size:14.5px;font-weight:700;color:var(--navy-800)}
.trust-item .d{margin-top:3px;font-size:13px;line-height:1.55;color:var(--gray-800)}

/* section heading row */
.head-row{display:flex;align-items:baseline;justify-content:space-between;gap:16px;flex-wrap:wrap}
.link-more{font-size:14px;font-weight:700;color:var(--navy-600)}
.stack-sm > * + *{margin-top:8px}
.mt-2{margin-top:8px}.mt-3{margin-top:12px}.mt-4{margin-top:16px}.mt-6{margin-top:24px}.mt-8{margin-top:32px}

/* state/model quick grids */
.qgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.qtile{display:flex;justify-content:space-between;align-items:baseline;gap:8px;padding:12px 14px;background:var(--white);border:1px solid var(--gray-200);border-radius:10px;text-decoration:none}
.qtile:hover{border-color:var(--volt-500);background:var(--green-50);text-decoration:none}
.qtile .n{font-size:14px;font-weight:700;color:var(--navy-800)}
.qtile .m{font-size:12.5px;color:var(--gray-600);font-variant-numeric:tabular-nums}
.chips{display:flex;gap:10px;flex-wrap:wrap}
.chip-link{display:inline-flex;align-items:baseline;gap:8px;padding:11px 16px;background:var(--white);border:1px solid var(--gray-200);border-radius:var(--r-pill);text-decoration:none}
.chip-link:hover{border-color:var(--volt-500);background:var(--green-50);text-decoration:none}
.chip-link .n{font-size:14px;font-weight:700;color:var(--navy-800)}
.chip-link .m{font-size:13px;font-weight:700;color:var(--green-700);font-variant-numeric:tabular-nums}
.chip-dashed{border:1px dashed var(--gray-300);font-size:14px;font-weight:700;color:var(--navy-600)}
.hub-region{margin-bottom:18px}
.hub-region:last-child{margin-bottom:0}
.hub-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:8px}
.hub-tile{display:flex;justify-content:space-between;align-items:baseline;gap:6px;padding:8px 11px;border:1px solid var(--gray-200);border-radius:8px;text-decoration:none;background:var(--white)}
.hub-tile:hover{border-color:var(--volt-500);background:var(--green-50);text-decoration:none}
.hub-tile .n{font-size:13px;font-weight:650;color:var(--navy-800);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.hub-tile .r{font-size:11.5px;color:var(--gray-500);font-variant-numeric:tabular-nums;flex:none}
.hub-tile.active{border-color:var(--volt-500);background:var(--green-50)}
.hub-tile.active .n{font-weight:800}

/* 404 */
.err{max-width:560px;margin:0 auto;padding:72px 40px 88px;text-align:center}
.err-tile{width:64px;height:64px;display:inline-flex;border-radius:18px;background:var(--navy-800);align-items:center;justify-content:center}
.err-code{margin-top:20px;font-size:64px;font-weight:800;letter-spacing:-0.02em;color:var(--navy-800);font-variant-numeric:tabular-nums;line-height:1}

/* ---------- Responsive ---------- */
@media (max-width:900px){
  .guide-grid{grid-template-columns:1fr}
  .toc{position:static}
  .trust-strip,.grid-3{grid-template-columns:1fr}
  .tools-grid,.grid-4{grid-template-columns:1fr 1fr}
  .qgrid{grid-template-columns:1fr 1fr}
  .hub-grid{grid-template-columns:repeat(3,1fr)}
}
@media (max-width:720px){
  :root{--nav-h:56px}
  body{font-size:16px}
  h1{font-size:28px}
  h2{font-size:22px}
  .container,.article{padding:0 20px}
  .nav-inner{padding:0 12px 0 16px;height:56px}
  .nav-links,.nav-has-menu .nav-dropdown{display:none}
  .nav-mobile-btn{display:inline-flex}
  .brand-tile{width:26px;height:26px}
  .brand-name{font-size:17.5px}
  .section{padding-top:36px}
  .hero{padding-top:28px}
  .hero h1{font-size:29px}
  .hero-cta .btn{width:100%}
  .calc{padding:20px}
  .calc-grid{grid-template-columns:1fr}
  .calc-inputs{padding-right:0;gap:16px}
  .calc-results{border-left:none;padding-left:0;border-top:1px solid var(--gray-200);padding-top:16px;margin-top:4px}
  .tools-grid,.grid-4,.grid-3,.grid-2{grid-template-columns:1fr}
  .footer-cols{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1 / -1}
  .footer-inner{padding:32px 20px 28px}
  .rcard .rc-stat{font-size:31px}
  .hub-grid,.qgrid{grid-template-columns:1fr 1fr}
  .ad-sticky{display:block}
  body:has(.ad-sticky){padding-bottom:74px}
  .err-code{font-size:52px}
}
@media (min-width:721px){
  .mobile-only{display:none}
}
@media (max-width:720px){
  .desktop-only{display:none}
}