/* Battery Passport Check — digital-product-passport / spec-sheet aesthetic
   Type: Sora (geometric display) + Work Sans (body) + DM Mono
   Palette: cool near-white + graphite + energy teal. A passport/QR/spec-card feel.
   Distinct from navy-dossier / cream-editorial / manila-manifest / dark-console. */
:root {
  --paper: #f5f8fa;
  --paper-2: #eaeff3;
  --card: #ffffff;
  --ink: #131a24;
  --ink-2: #3d4855;        /* AA on paper */
  --muted: #5c6875;        /* AA on paper/card */
  --line: #d8e0e7;
  --line-2: #e6ecf1;
  --teal: #0a6a61;         /* energy accent — AA on paper as text */
  --teal-2: #0aa79b;
  --teal-bg: #e2f2f0;
  --amber: #8a4e00;        /* watch/already-owed — AA on paper */
  --amber-bg: #f6ecda;
  --red: #b0322a;          /* required/flag — AA on paper */
  --display: 'Sora', system-ui, sans-serif;
  --sans: 'Work Sans', system-ui, sans-serif;
  --mono: 'DM Mono', ui-monospace, monospace;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: var(--sans); color: var(--ink); background: var(--paper); font-size: 17px; line-height: 1.6; -webkit-font-smoothing: antialiased; }
.container { max-width: 1060px; margin: 0 auto; padding: 0 26px; }
a { color: var(--teal); }
h1, h2, h3, h4 { font-family: var(--display); font-weight: 700; color: var(--ink); letter-spacing: -0.015em; }

.skip-link { position: absolute; left: -999px; top: 0; background: var(--ink); color: #fff; padding: 10px 16px; z-index: 100; }
.skip-link:focus { left: 8px; top: 8px; }
:focus-visible { outline: 3px solid var(--teal); outline-offset: 2px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }

.masthead { border-bottom: 1px solid var(--line); background: var(--card); position: sticky; top: 0; z-index: 40; }
.masthead-inner { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.nameplate { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.np-mark { width: 30px; height: 30px; border-radius: 7px; background: var(--ink); display: grid; place-items: center; color: var(--teal-2); font-family: var(--mono); font-weight: 500; font-size: 15px; }
.np-word { font-family: var(--display); font-weight: 800; font-size: 18px; letter-spacing: -0.02em; color: var(--ink); }
.np-word span { color: var(--teal); }
.np-tag { font-family: var(--mono); font-size: 10px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.top-nav { display: flex; gap: 24px; align-items: center; }
.top-nav a { font-family: var(--sans); font-size: 13px; font-weight: 600; color: var(--ink-2); text-decoration: none; }
.top-nav a:hover { color: var(--teal); }
.top-nav .nav-cta { background: var(--ink); color: #fff; padding: 9px 16px; border-radius: 7px; }
.top-nav .nav-cta:hover { background: var(--teal); }
.nav-toggle { display: none; background: none; border: 1px solid var(--line); border-radius: 7px; width: 42px; height: 38px; cursor: pointer; }
.nav-toggle span, .nav-toggle span:before, .nav-toggle span:after { display: block; width: 18px; height: 2px; background: var(--ink); position: relative; margin: 0 auto; content: ''; }
.nav-toggle span:before { position: absolute; top: -6px; content: ''; }
.nav-toggle span:after { position: absolute; top: 6px; content: ''; }

.hero { padding: 62px 0 54px; border-bottom: 1px solid var(--line); background: linear-gradient(180deg, var(--teal-bg) 0%, var(--paper) 60%); }
.hero-grid { display: grid; grid-template-columns: 1.08fr 0.92fr; gap: 48px; align-items: center; }
.kicker { font-family: var(--mono); font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--teal); margin-bottom: 18px; }
.hero h1 { font-size: 47px; line-height: 1.05; margin: 0 0 18px; font-weight: 800; color: var(--ink); }
.hero .lede { font-size: 19px; color: var(--ink-2); margin: 0 0 26px; line-height: 1.5; }
.hero-cta { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.btn-primary { display: inline-block; background: var(--ink); color: #fff; text-decoration: none; font-family: var(--display); font-weight: 700; font-size: 16px; padding: 15px 26px; border-radius: 8px; border: none; cursor: pointer; transition: background .15s; }
.btn-primary:hover { background: var(--teal); color: #fff; }
.btn-large { font-size: 17px; padding: 17px 30px; }
.cta-note { font-size: 13px; color: var(--muted); }
.cta-note a { color: var(--teal); }

/* passport card exhibit */
.passport { background: var(--card); border: 1px solid var(--line); border-radius: 14px; box-shadow: 0 18px 44px -26px rgba(13,125,117,0.4); overflow: hidden; }
.pp-head { background: var(--ink); color: #fff; padding: 14px 18px; display: flex; justify-content: space-between; align-items: center; }
.pp-head .t { font-family: var(--display); font-weight: 700; font-size: 14px; }
.pp-head .qr { width: 26px; height: 26px; border-radius: 4px; background: repeating-conic-gradient(var(--teal-2) 0% 25%, #0e1a1a 0% 50%) 50% / 8px 8px; }
.pp-body { padding: 6px 18px 16px; }
.pp-row { padding: 12px 0; border-bottom: 1px solid var(--line-2); }
.pp-row:last-child { border-bottom: none; }
.pp-row .r { font-family: var(--display); font-weight: 700; font-size: 14px; color: var(--ink); }
.pp-row .d { font-size: 13px; color: var(--ink-2); margin-top: 2px; }
.pill { font-family: var(--mono); font-size: 10px; font-weight: 500; padding: 2px 8px; border-radius: 20px; white-space: nowrap; }
.pill.req { background: #f6e4e2; color: var(--red); }
.pill.owe { background: var(--amber-bg); color: var(--amber); }
.pill.ok { background: var(--teal-bg); color: var(--teal); }

section { padding: 60px 0; }
.sec-tag { font-family: var(--mono); font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--teal); margin-bottom: 12px; }
.sec-h { font-size: 33px; line-height: 1.1; margin: 0 0 14px; max-width: 24ch; font-weight: 800; }
.sec-sub { font-size: 18px; color: var(--ink-2); margin: 0 0 8px; max-width: 62ch; }
.band { background: var(--paper-2); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

.grid4 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-top: 34px; }
.g-item { padding: 24px; border: 1px solid var(--line); border-radius: 12px; background: var(--card); }
.g-item .lbl { font-family: var(--mono); font-size: 11px; letter-spacing: 0.05em; text-transform: uppercase; color: var(--teal); margin-bottom: 10px; }
.g-item h3 { font-size: 19px; margin: 0 0 6px; }
.g-item p { font-size: 14.5px; color: var(--ink-2); margin: 0; line-height: 1.5; }

.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-top: 36px; }
.step .num { font-family: var(--display); font-weight: 800; font-size: 15px; color: #fff; background: var(--teal); width: 32px; height: 32px; border-radius: 8px; display: grid; place-items: center; margin-bottom: 12px; }
.step h3 { font-size: 19px; margin: 0 0 6px; }
.step p { font-size: 15px; color: var(--ink-2); margin: 0; }

/* scope checker (quiz) */
.checker-box { max-width: 680px; margin: 30px auto 0; background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 26px 28px; text-align: left; box-shadow: 0 14px 40px -28px rgba(13,125,117,0.4); }
fieldset.cq { border: none; margin: 0 0 18px; padding: 0; }
.cq legend { display: block; font-family: var(--display); font-weight: 700; font-size: 15px; margin-bottom: 10px; color: var(--ink); }
.opt-row { display: flex; flex-wrap: wrap; gap: 8px; }
.opt { position: relative; display: inline-flex; align-items: center; cursor: pointer; border: 1px solid var(--line); border-radius: 8px; padding: 9px 13px; font-size: 14px; color: var(--ink-2); background: var(--paper); transition: all .12s; }
.opt input { position: absolute; opacity: 0; width: 0; height: 0; }
.opt:hover { border-color: var(--teal); }
.opt:has(input:checked) { border-color: var(--teal); background: var(--teal-bg); color: var(--ink); font-weight: 600; }
.opt:has(input:focus-visible) { outline: 3px solid var(--teal); outline-offset: 2px; }
.checker-result { margin-top: 20px; padding: 20px 22px; border: 1px solid var(--line); border-radius: 10px; background: var(--paper); }
.checker-result[hidden] { display: none; }
.cr-verdict { font-family: var(--mono); font-size: 13px; font-weight: 500; letter-spacing: 0.03em; text-transform: uppercase; margin-bottom: 8px; }
.cr-verdict.req { color: var(--red); } .cr-verdict.no { color: var(--teal); } .cr-verdict.watch { color: var(--amber); }
.cr-why { font-size: 15px; color: var(--ink-2); line-height: 1.5; }
.cr-owe { font-size: 14px; color: var(--amber); margin: 10px 0 0; padding: 10px 12px; background: var(--amber-bg); border-radius: 6px; }
.cr-verify { font-size: 13px; color: var(--muted); margin: 12px 0 0; font-style: italic; line-height: 1.5; }
.lead-capture { display: flex; gap: 10px; margin: 16px 0 0; }
.lead-capture input { flex: 1; font-family: var(--sans); font-size: 14px; padding: 11px 14px; border: 1px solid var(--line); border-radius: 8px; background: var(--card); color: var(--ink); }
.lead-capture input:focus { outline: none; border-color: var(--teal); }
.lead-capture .btn-primary { font-size: 14px; padding: 11px 18px; }
.lead-msg { font-size: 13px; color: var(--muted); margin: 8px 0 0; }

.audit-wrap { max-width: 780px; margin: 0 auto; }
.auditform { background: var(--card); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; box-shadow: 0 18px 50px -34px rgba(13,125,117,0.5); }
.af-price { background: var(--ink); color: #fff; padding: 16px 32px; display: flex; align-items: baseline; justify-content: space-between; }
.af-price .p { font-family: var(--display); font-weight: 800; font-size: 26px; }
.af-price .p small { font-family: var(--sans); font-size: 13px; opacity: 0.72; margin-left: 6px; }
.af-price .n { font-family: var(--mono); font-size: 11px; letter-spacing: 0.06em; text-transform: uppercase; opacity: 0.8; }
.af-inner { padding: 30px 32px 32px; }
.af-field { margin-bottom: 20px; }
.af-field > label, .af-legend { display: block; font-family: var(--display); font-weight: 700; font-size: 15px; margin-bottom: 4px; color: var(--ink); }
.af-help { font-size: 13px; color: var(--muted); margin: 0 0 10px; }
.af-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.auditform input[type=text], .auditform input[type=email], .auditform textarea, .auditform select {
  width: 100%; font-family: var(--sans); font-size: 15px; color: var(--ink); background: var(--paper); border: 1px solid var(--line); border-radius: 8px; padding: 12px 14px; outline: none; transition: border-color .12s; }
.auditform textarea { min-height: 100px; resize: vertical; font-family: var(--mono); font-size: 14px; line-height: 1.5; }
.auditform input:focus, .auditform textarea:focus, .auditform select:focus { border-color: var(--teal); box-shadow: 0 0 0 3px rgba(13,125,117,0.12); }
fieldset.af-field { border: none; margin: 0 0 20px; padding: 0; }
.af-submit { margin-top: 6px; } .af-submit .btn-primary { width: 100%; text-align: center; }
.af-fine { font-size: 12.5px; color: var(--muted); margin: 12px 0 0; text-align: center; line-height: 1.5; }
.order-status { margin-top: 14px; font-family: var(--mono); font-size: 13px; padding: 11px 14px; border-left: 3px solid var(--muted); background: var(--paper-2); color: var(--ink-2); }
.order-status.err { border-left-color: var(--red); background: #f6e4e2; color: #7a231d; }

.callout { background: var(--paper-2); border-left: 4px solid var(--teal); border-radius: 0 8px 8px 0; padding: 20px 24px; margin: 26px 0; }
.callout strong { color: var(--ink); }

/* prose lists on content pages (about / methodology / sources) */
.prose-list { margin: 4px 0 0; padding-left: 22px; max-width: 66ch; }
.prose-list li { font-size: 16.5px; color: var(--ink-2); line-height: 1.6; margin-bottom: 12px; }
.prose-list li strong { color: var(--ink); }
.prose p { font-size: 16.5px; color: var(--ink-2); line-height: 1.65; max-width: 66ch; }
.prose p strong { color: var(--ink); }
.prose h2 { font-size: 26px; margin: 34px 0 12px; }
.prose h2:first-child { margin-top: 0; }
.prose a { color: var(--teal); }
.prose a.btn-primary { color: #fff; text-decoration: none; }
.prose a.btn-primary:hover { color: #fff; }
.src { border: 1px solid var(--line); border-radius: 12px; background: var(--card); padding: 22px 24px; margin: 0 0 16px; }
.src h3 { font-size: 18px; margin: 0 0 6px; }
.src h3 a { color: var(--teal); }
.src .use { font-size: 15px; color: var(--ink-2); margin: 0 0 8px; line-height: 1.55; }
.src .fresh { font-family: var(--mono); font-size: 12px; letter-spacing: 0.03em; color: var(--muted); margin: 0; }
.faq-item { border-bottom: 1px solid var(--line); padding: 22px 0; }
.faq-item h3 { font-size: 19px; margin: 0 0 8px; }
.faq-item p { font-size: 15.5px; color: var(--ink-2); margin: 0; }

.site-footer { background: var(--ink); color: #a8b4c0; padding: 50px 0 30px; }
.footer-inner { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 30px; }
.footer-inner h4 { color: #fff; font-family: var(--mono); font-weight: 500; font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase; margin: 0 0 14px; }
.footer-inner a { display: block; color: #a8b4c0; text-decoration: none; font-size: 14px; margin-bottom: 9px; }
.footer-inner a:hover { color: #fff; }
.foot-brand { font-family: var(--display); font-weight: 800; font-size: 19px; color: #fff; margin-bottom: 8px; }
.foot-tag { font-size: 14px; color: #8b97a4; line-height: 1.55; max-width: 32ch; }
.foot-fine { grid-column: 1 / -1; border-top: 1px solid rgba(255,255,255,0.12); margin-top: 32px; padding-top: 20px; font-size: 12.5px; color: #808d9a; line-height: 1.6; }

/* --- guides --- */
.crumb { font-family: var(--mono); font-size: 12px; color: var(--muted); margin: 0 0 6px; letter-spacing: 0.02em; }
.crumb a { color: var(--teal); text-decoration: none; }
.crumb a:hover { text-decoration: underline; }
.crumb span[aria-current] { color: var(--ink-2); }
.answer-box { background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--teal); border-radius: 0 12px 12px 0; padding: 22px 26px; margin: 26px 0 30px; box-shadow: 0 14px 40px -30px rgba(13,125,117,0.4); }
.answer-box .lbl { font-family: var(--mono); font-size: 11px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--teal); margin: 0 0 8px; }
.answer-box p { font-size: 18px; color: var(--ink); line-height: 1.55; margin: 0; max-width: 64ch; }
.answer-box p + p { margin-top: 12px; font-size: 16.5px; color: var(--ink-2); }
.guide-body h2 { font-size: 26px; margin: 40px 0 12px; }
.guide-body h3 { font-size: 19px; margin: 26px 0 8px; }
.guide-body p, .guide-body li { font-size: 16.5px; color: var(--ink-2); line-height: 1.65; max-width: 66ch; }
.guide-body p strong, .guide-body li strong { color: var(--ink); }
.guide-body ul, .guide-body ol { padding-left: 22px; max-width: 66ch; }
.guide-body li { margin-bottom: 10px; }
.gtable { width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 15px; }
.gtable caption { text-align: left; font-family: var(--mono); font-size: 11px; letter-spacing: 0.05em; text-transform: uppercase; color: var(--teal); margin-bottom: 8px; }
.gtable th, .gtable td { text-align: left; padding: 11px 14px; border: 1px solid var(--line); vertical-align: top; color: var(--ink-2); }
.gtable th { background: var(--paper-2); font-family: var(--display); font-weight: 700; color: var(--ink); font-size: 14px; }
.gtable td strong { color: var(--ink); }
.wrap-table { overflow-x: auto; }
.advice-note { font-size: 14px; color: var(--muted); font-style: italic; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 14px 0; margin: 26px 0; line-height: 1.55; }
.sources-block { margin: 30px 0 0; }
.sources-block h2 { font-size: 22px; margin: 0 0 12px; }
.sources-block ol { padding-left: 22px; }
.sources-block li { font-size: 14.5px; color: var(--ink-2); line-height: 1.55; margin-bottom: 10px; }
.sources-block a { color: var(--teal); word-break: break-word; }
.guide-cta { background: var(--paper-2); border: 1px solid var(--line); border-radius: 12px; padding: 26px 28px; margin: 34px 0; text-align: center; }
.guide-cta h2 { font-size: 22px; margin: 0 0 8px; }
.guide-cta p { font-size: 15.5px; color: var(--ink-2); margin: 0 auto 16px; max-width: 52ch; }
.related { margin: 34px 0 0; }
.related h2 { font-size: 20px; margin: 0 0 14px; }
.related-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.rel-card { display: block; border: 1px solid var(--line); border-radius: 10px; background: var(--card); padding: 18px 20px; text-decoration: none; transition: border-color .12s, transform .12s; }
.rel-card:hover { border-color: var(--teal); transform: translateY(-2px); }
.rel-card .rk { font-family: var(--mono); font-size: 10px; letter-spacing: 0.05em; text-transform: uppercase; color: var(--teal); }
.rel-card .rt { font-family: var(--display); font-weight: 700; font-size: 15.5px; color: var(--ink); margin-top: 4px; line-height: 1.3; }
/* guides landing cards */
.guide-cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; margin-top: 36px; }
.gc { display: flex; flex-direction: column; border: 1px solid var(--line); border-radius: 12px; background: var(--card); padding: 26px; text-decoration: none; transition: border-color .12s, transform .12s, box-shadow .12s; }
.gc:hover { border-color: var(--teal); transform: translateY(-3px); box-shadow: 0 18px 44px -30px rgba(13,125,117,0.4); }
.gc .gc-k { font-family: var(--mono); font-size: 11px; letter-spacing: 0.05em; text-transform: uppercase; color: var(--teal); margin-bottom: 10px; }
.gc h2 { font-size: 20px; margin: 0 0 8px; line-height: 1.2; }
.gc p { font-size: 15px; color: var(--ink-2); margin: 0; line-height: 1.5; }
.gc .gc-go { font-family: var(--display); font-weight: 700; font-size: 14px; color: var(--teal); margin-top: 14px; }

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 38px; }
  .grid4 { grid-template-columns: 1fr; } .steps { grid-template-columns: 1fr; } .footer-inner { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 900px) {
  .related-grid { grid-template-columns: 1fr; } .guide-cards { grid-template-columns: 1fr; }
}
@media (max-width: 660px) {
  .hero h1 { font-size: 36px; } .sec-h { font-size: 26px; } .af-2 { grid-template-columns: 1fr; }
  .top-nav { display: none; position: absolute; left: 0; right: 0; background: var(--card); border-bottom: 1px solid var(--line); flex-direction: column; gap: 0; padding: 8px 0; z-index: 30; }
  .top-nav:not([hidden]) { display: flex; } .top-nav a { padding: 12px 26px; } .nav-toggle { display: block; }
  .footer-inner { grid-template-columns: 1fr; } .lead-capture { flex-direction: column; }
}