/* UsedItFirst solar research silo — scoped editorial system */
:root{
  --solar:var(--accent,#4f46e5);
  --solar-dark:#252b46;
  --solar-soft:var(--accent-soft,#eef2ff);
  --sun:var(--gold,#b0883f);
  --sun-soft:#faf6ed;
  --solar-ink:var(--ink,#0f1729);
}

body[data-cluster="solar"]{background:#fff;color:var(--ink)}
body[data-cluster="solar"]>.skip{position:absolute;left:12px;top:-90px;z-index:100;background:#fff;color:var(--ink);border:2px solid var(--accent);border-radius:9px;padding:10px 14px;font-weight:800}
body[data-cluster="solar"]>.skip:focus{top:10px}
body[data-cluster="solar"] .topdisc{background:#f7f8fa}
body[data-cluster="solar"] .nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:blur(16px);border-bottom:1px solid var(--hair)}
body[data-cluster="solar"] .nav-in{height:64px;max-width:1160px}
body[data-cluster="solar"] .nav-links a[aria-current="page"]{color:var(--solar);font-weight:700}

.solar-shell{width:min(1160px,calc(100% - 48px));margin-inline:auto}
.solar-narrow{width:min(760px,calc(100% - 48px));margin-inline:auto}
.solar-eyebrow{display:block;color:var(--solar);font-size:.72rem;font-weight:800;letter-spacing:.18em;text-transform:uppercase}
.solar-button{display:inline-flex;align-items:center;justify-content:center;gap:9px;border:1px solid var(--solar);border-radius:11px;background:var(--solar);color:#fff;font-weight:750;padding:13px 19px;line-height:1.2;transition:transform .15s ease,background .15s ease}
.solar-button:hover{background:var(--solar-dark);border-color:var(--solar-dark);transform:translateY(-1px)}
.solar-button.secondary{background:#fff;color:var(--solar)}
.solar-button.secondary:hover{background:var(--solar-soft)}
.solar-text-link{color:var(--solar);font-weight:750}
.solar-text-link:hover{text-decoration:underline}

.solar-hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line,#e6e9ee);background:radial-gradient(720px 430px at 85% 8%,rgba(79,70,229,.10),transparent 68%),linear-gradient(145deg,#fff 0%,#f7f8fa 100%);padding:78px 0 72px}
.solar-hero-grid{display:grid;grid-template-columns:1.02fr .98fr;gap:68px;align-items:center}
.solar-hero h1,.article-hero h1,.calc-hero h1{max-width:780px;margin:14px 0 0;color:var(--solar-ink);font-size:clamp(2.55rem,5.5vw,4.7rem);font-weight:850;letter-spacing:-.055em;line-height:.98}
.solar-hero .deck,.article-hero .deck,.calc-hero .deck{max-width:630px;margin:22px 0 0;color:var(--soft,#4b5563);font-size:clamp(1.06rem,1.65vw,1.25rem);line-height:1.62}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:29px}
.trust-line{display:flex;flex-wrap:wrap;gap:10px 22px;margin-top:28px;padding-top:22px;border-top:1px solid var(--line,#e6e9ee);color:#667085;font-size:.82rem;font-weight:650}
.trust-line span::before{content:"\2713";margin-right:7px;color:var(--solar);font-weight:900}

.solar-photo{position:relative;min-height:430px;aspect-ratio:3/2;margin:0;border:1px solid rgba(15,23,41,.10);border-radius:28px;background:#e9edf3;box-shadow:0 30px 70px rgba(15,23,41,.16);overflow:hidden}
.solar-photo::after{content:"";position:absolute;inset:45% 0 0;background:linear-gradient(transparent,rgba(15,23,41,.42));pointer-events:none}
.solar-photo img{width:100%;height:100%;object-fit:cover;object-position:center;display:block}
.solar-photo figcaption{position:absolute;z-index:2;left:22px;right:22px;bottom:20px;display:flex;align-items:center;gap:9px;color:#fff;font-size:.78rem;font-weight:750;letter-spacing:.01em;text-shadow:0 1px 12px rgba(0,0,0,.4)}
.solar-photo figcaption::before{content:"";width:8px;height:8px;border-radius:50%;background:#fff;box-shadow:0 0 0 4px rgba(255,255,255,.18)}

.answer-band{background:var(--solar-dark);color:#fff}
.answer-grid{display:grid;grid-template-columns:150px 1fr auto;gap:28px;align-items:center;padding:25px 0}
.answer-grid .answer-label{color:#c7d2fe;font-size:.7rem;font-weight:850;letter-spacing:.17em;text-transform:uppercase}
.answer-grid p{font-size:1.08rem;font-weight:650;line-height:1.5}
.answer-grid a{white-space:nowrap;color:#fff;font-weight:800}

.solar-section{padding:76px 0}
.solar-section.soft{background:var(--canvas,#f7f8fa);border-block:1px solid var(--line,#e6e9ee)}
.section-head{display:grid;grid-template-columns:1fr minmax(260px,470px);gap:50px;align-items:end;margin-bottom:31px}
.section-head h2{margin-top:10px;font-size:clamp(1.8rem,3.5vw,2.85rem);font-weight:850;letter-spacing:-.04em;line-height:1.03;color:var(--solar-ink)}
.section-head p{color:var(--soft,#4b5563);font-size:1.02rem;line-height:1.65}
.decision-grid,.merchant-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.decision-card,.merchant-card{display:flex;flex-direction:column;min-height:244px;border:1px solid var(--line,#e6e9ee);border-radius:18px;background:#fff;padding:24px;box-shadow:0 7px 24px rgba(15,23,41,.055)}
.decision-card:hover{border-color:#c7d2fe;box-shadow:0 16px 34px rgba(15,23,41,.10);transform:translateY(-2px)}
.decision-card .kicker,.merchant-card .merchant{color:var(--solar);font-size:.66rem;font-weight:850;letter-spacing:.15em;text-transform:uppercase}
.decision-card h3,.merchant-card h3{margin:13px 0 9px;font-size:1.28rem;letter-spacing:-.025em;line-height:1.18;color:var(--solar-ink)}
.decision-card p,.merchant-card p{color:var(--soft,#4b5563);line-height:1.58}
.decision-card .card-go{margin-top:auto;padding-top:22px;color:var(--solar);font-weight:800}

.status-panel{border:1px solid var(--line,#e6e9ee);border-radius:18px;background:#fff;overflow:hidden;box-shadow:0 8px 26px rgba(15,23,41,.05)}
.status-row{display:grid;grid-template-columns:1.35fr 1.35fr .8fr .45fr;gap:20px;align-items:center;padding:18px 21px;border-bottom:1px solid var(--hair,#eef1f5);color:var(--soft,#4b5563);font-size:.94rem;line-height:1.45}
.status-row:last-child{border-bottom:0}.status-row.head{background:#f8f9fc;color:#737b89;font-size:.67rem;font-weight:850;letter-spacing:.09em;text-transform:uppercase}
.status-row strong{color:var(--solar-ink)}
.solar-pill{display:inline-flex;width:max-content;border-radius:999px;background:var(--solar-soft);color:var(--solar);font-size:.72rem;font-weight:800;padding:6px 9px}
.solar-pill.wait{background:var(--sun-soft);color:#8b5d08}

.merchant-card{min-height:320px}
.merchant-card ul{margin:5px 0 22px;padding-left:19px;color:var(--soft,#4b5563);line-height:1.55}
.merchant-card li{margin:7px 0}
.merchant-card .solar-button{margin-top:auto}
.merchant-card .store-note{margin-top:10px;color:#849088;font-size:.76rem;line-height:1.45;text-align:center}
.affiliate-note{max-width:850px;margin:21px auto 0;color:#667085;font-size:.82rem;line-height:1.6;text-align:center}

.proof-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.proof-item{border-left:3px solid var(--solar);padding:8px 0 8px 22px}
.proof-item strong{display:block;color:var(--solar-ink);font-size:2.35rem;letter-spacing:-.045em}.proof-item span{display:block;max-width:43ch;margin-top:6px;color:var(--soft,#4b5563);line-height:1.55}

.faq-list{display:grid;gap:0;border-top:1px solid var(--line,#e6e9ee)}
.faq-item{padding:24px 0;border-bottom:1px solid var(--line,#e6e9ee)}.faq-item h3{font-size:1.08rem;color:var(--solar-ink);letter-spacing:-.01em}.faq-item p{margin-top:7px;color:var(--soft,#4b5563);line-height:1.7}

/* Article and calculator */
.article-hero,.calc-hero{border-bottom:1px solid var(--line,#e6e9ee);background:linear-gradient(145deg,#fff,#f7f8fa);padding:56px 0 50px}
.article-hero h1,.calc-hero h1{font-size:clamp(2.35rem,5vw,4.1rem)}
.breadcrumb{display:flex;flex-wrap:wrap;gap:7px;color:#77867e;font-size:.8rem;margin-bottom:24px}.breadcrumb a{color:var(--solar);font-weight:700}
.article-meta{display:flex;flex-wrap:wrap;gap:8px 22px;margin-top:24px;color:#707887;font-size:.82rem}
.article-layout{display:grid;grid-template-columns:minmax(0,760px) 250px;gap:74px;align-items:start;padding:54px 0 86px}
.article-layout>*{min-width:0}.solar-article{min-width:0}
.solar-article h2{margin:42px 0 11px;color:var(--solar-ink);font-size:1.65rem;letter-spacing:-.03em;line-height:1.18}.solar-article h2:first-of-type{margin-top:34px}
.solar-article h3{margin:24px 0 7px;color:var(--solar-ink);font-size:1.08rem}.solar-article p,.solar-article li{color:var(--soft,#4b5563);font-size:1.04rem;line-height:1.75}.solar-article p{margin:12px 0}.solar-article ul,.solar-article ol{margin:14px 0;padding-left:23px}.solar-article li{margin:8px 0}
.direct-answer{border:1px solid #c7d2fe;border-left:4px solid var(--solar);border-radius:12px;background:var(--solar-soft);padding:20px 22px;color:#28305a;font-size:1.06rem;line-height:1.67}.direct-answer strong{color:#312e81}
.solar-callout{margin:24px 0;border:1px solid #efd89f;border-radius:12px;background:var(--sun-soft);padding:17px 20px;color:#684c14;line-height:1.62}.solar-callout strong{color:#513907}
.fact-table-wrap{max-width:100%;overflow-x:auto;margin:18px 0;border:1px solid var(--line,#e6e9ee);border-radius:14px}.fact-table{width:100%;border-collapse:collapse;min-width:580px}.fact-table th,.fact-table td{padding:14px 16px;border-bottom:1px solid var(--hair,#eef1f5);text-align:left;vertical-align:top;font-size:.94rem;line-height:1.5}.fact-table tr:last-child th,.fact-table tr:last-child td{border-bottom:0}.fact-table th{width:28%;background:#f8f9fc;color:var(--solar-ink)}.fact-table td{color:var(--soft,#4b5563)}
.side-card{position:sticky;top:86px;border:1px solid var(--line,#e6e9ee);border-radius:14px;background:#fff;padding:18px}.side-card h3{margin:0 0 10px;color:var(--solar-ink);font-size:.9rem}.side-card a{display:block;padding:8px 0;border-bottom:1px solid var(--hair,#eef1f5);color:#667085;font-size:.84rem}.side-card a:last-child{border-bottom:0}.side-card a:hover{color:var(--solar)}
.source-list{list-style:none!important;padding:0!important}.source-list li{padding:14px 0!important;border-bottom:1px solid var(--line,#e6e9ee)}.source-list a{color:var(--solar);font-weight:750}.source-list small{display:block;margin-top:3px;color:#737b89;font-size:.78rem;line-height:1.5}

/* Cluster indexes and evidence-first guides */
.status-banner{display:flex;align-items:flex-start;gap:12px;margin:0 0 26px;border:1px solid #d8dde7;border-radius:13px;background:#f8f9fc;padding:16px 18px;color:#465065;line-height:1.55}.status-banner::before{content:"";flex:0 0 10px;width:10px;height:10px;margin-top:7px;border-radius:50%;background:var(--sun)}.status-banner.allowed{border-color:#badfd1;background:#f0faf6;color:#245d4b}.status-banner.allowed::before{background:#238664}.status-banner.pending{border-color:#efd89f;background:var(--sun-soft);color:#684c14}.status-banner.pending::before{background:#b07812}.status-banner strong{color:inherit}
.fact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:20px 0 26px}.fact-card{border:1px solid var(--line,#e6e9ee);border-radius:13px;background:#fff;padding:17px}.fact-card span{display:block;color:#737b89;font-size:.68rem;font-weight:800;letter-spacing:.1em;text-transform:uppercase}.fact-card strong{display:block;margin-top:7px;color:var(--solar-ink);font-size:1.03rem;line-height:1.35}
.checklist{display:grid;gap:10px;margin:18px 0!important;padding:0!important;list-style:none!important}.checklist li{position:relative;margin:0!important;border:1px solid var(--line,#e6e9ee);border-radius:11px;background:#fff;padding:13px 14px 13px 42px!important}.checklist li::before{content:"\2713";position:absolute;left:15px;top:13px;color:var(--solar);font-weight:900}
.related-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-top:18px}.related-card{display:block;border:1px solid var(--line,#e6e9ee);border-radius:13px;background:#fff;padding:17px;color:var(--solar-ink);font-weight:800;line-height:1.35}.related-card small{display:block;margin-top:6px;color:#737b89;font-weight:500;line-height:1.5}.related-card:hover{border-color:#c7d2fe;background:#fafaff}
.cluster-directory{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.directory-card{border:1px solid var(--line,#e6e9ee);border-radius:17px;background:#fff;padding:22px}.directory-card h3{margin:0 0 12px;color:var(--solar-ink);font-size:1.15rem}.directory-card a{display:block;padding:9px 0;border-bottom:1px solid var(--hair,#eef1f5);color:#4f596c;font-size:.91rem;line-height:1.35}.directory-card a:last-child{border-bottom:0}.directory-card a:hover{color:var(--solar)}
.evidence-stamp{display:inline-flex;align-items:center;gap:7px;margin-top:12px;border-radius:999px;background:#eef2ff;color:#4338ca;padding:7px 10px;font-size:.72rem;font-weight:800}.evidence-stamp::before{content:"\2713"}
.brand-verdict{display:grid;grid-template-columns:150px 1fr;gap:20px;margin:22px 0;border:1px solid var(--line,#e6e9ee);border-radius:15px;overflow:hidden}.brand-verdict>strong{display:flex;align-items:center;justify-content:center;background:var(--solar-dark);color:#fff;padding:22px;text-align:center}.brand-verdict>div{padding:20px}.brand-verdict h2{margin:0 0 7px!important;font-size:1.25rem}.brand-verdict p{margin:0!important}

.calculator-card{display:grid;grid-template-columns:1fr .88fr;gap:28px;border:1px solid var(--line,#e6e9ee);border-radius:22px;background:#fff;padding:28px;box-shadow:0 18px 48px rgba(15,23,41,.09)}
.calc-panel h2,.calc-result h2{margin:0 0 7px;color:var(--solar-ink);font-size:1.28rem;letter-spacing:-.02em}.calc-panel>p{margin:0 0 20px;color:#6b7b73;font-size:.9rem;line-height:1.55}
.field-grid{display:grid;grid-template-columns:1fr 1fr;gap:15px}.field-grid label{display:flex;flex-direction:column;gap:6px;color:var(--solar-ink);font-size:.79rem;font-weight:750}.field-grid input{width:100%;border:1px solid #d8dde7;border-radius:10px;background:#fff;padding:12px 13px;color:var(--ink);font:inherit;font-size:1rem}.field-grid input:focus{border-color:var(--solar);outline:3px solid rgba(79,70,229,.14)}
.calc-help{margin:16px 0;color:#77867e;font-size:.78rem;line-height:1.55}
.calc-result{border-radius:17px;background:var(--solar-dark);padding:26px;color:#fff}.calc-result h2{color:#fff}.calc-result .result-label{display:block;margin-top:24px;color:#c7d2fe;font-size:.71rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase}.calc-result .result-main{display:block;margin-top:5px;color:#fff;font-size:clamp(2.25rem,4.5vw,3.65rem);font-weight:850;letter-spacing:-.05em;line-height:1}.result-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:24px}.result-cell{border:1px solid rgba(255,255,255,.14);border-radius:10px;background:rgba(255,255,255,.06);padding:12px}.result-cell span{display:block;color:#c7d2fe;font-size:.68rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em}.result-cell b{display:block;margin-top:5px;color:#fff;font-size:1.04rem}.calc-result p{margin-top:20px;color:#d7dae5;font-size:.77rem;line-height:1.55}
.formula{display:grid;gap:12px;margin:18px 0}.formula div{border-left:3px solid var(--solar);padding:4px 0 4px 15px;color:#52645b;line-height:1.65}.formula strong{color:var(--solar-ink)}

.solar-footer{background:#232f3e;color:#c6ccd6;margin-top:0;padding:48px 0 30px;font-size:.85rem;line-height:1.65}.solar-footer a{color:#f5f7fb}.solar-footer .footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:28px}.solar-footer h4{margin:0 0 12px;color:#fff;font-size:.72rem;letter-spacing:.12em;text-transform:uppercase}.solar-footer a:not(.fbrand){display:block;margin:7px 0}.solar-footer .fbrand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:750;font-size:1.08rem}.solar-footer .fbrand .mk{width:26px;height:26px;border-radius:8px;background:var(--accent);display:grid;place-items:center;color:#fff;font-size:.72rem}.solar-footer .footnote{border-top:1px solid rgba(255,255,255,.12);margin-top:26px;padding-top:20px;color:#9da7b7;font-size:.76rem}

@media(max-width:900px){
  .solar-hero-grid{grid-template-columns:1fr;gap:38px}.solar-photo{min-height:360px}.answer-grid{grid-template-columns:1fr;gap:10px}.answer-grid a{margin-top:4px}.section-head{grid-template-columns:1fr;gap:12px;align-items:start}.decision-grid,.merchant-grid{grid-template-columns:1fr 1fr}.status-row{grid-template-columns:1.2fr 1fr .8fr}.status-row>*:last-child{grid-column:1/-1}.status-row.head>*:last-child{display:none}.article-layout{grid-template-columns:1fr;gap:30px}.side-card{position:static;display:none}.calculator-card{grid-template-columns:1fr}.solar-footer .footer-grid{grid-template-columns:1fr 1fr}.cluster-directory{grid-template-columns:1fr 1fr}
}
@media(max-width:640px){
  .solar-shell,.solar-narrow{width:min(100% - 32px,1160px)}.solar-hero{padding:52px 0}.solar-hero h1{font-size:2.7rem}.solar-photo{min-height:290px;border-radius:20px}.decision-grid,.merchant-grid,.proof-grid,.cluster-directory,.fact-grid,.related-grid{grid-template-columns:1fr}.solar-section{padding:56px 0}.status-panel{border:0;background:transparent;box-shadow:none;display:grid;gap:12px}.status-row{display:grid;grid-template-columns:1fr;border:1px solid var(--line,#e6e9ee);border-radius:13px;background:#fff;gap:7px;padding:17px}.status-row.head{display:none}.field-grid{grid-template-columns:1fr}.calculator-card{padding:18px}.article-layout{padding-top:34px}.solar-footer .footer-grid{grid-template-columns:1fr}.solar-footer .footer-grid>div:not(:first-child){border-top:1px solid rgba(255,255,255,.12);padding-top:16px}.brand-verdict{grid-template-columns:1fr}.brand-verdict>strong{justify-content:flex-start;text-align:left}
}