/* TaxQuarters — clean, trustworthy finance UI. ~10KB, no deps. */
:root{
  --ink:#12211c;--muted:#5b6f66;--line:#dde5e1;--surface:#fff;--bg:#f4f7f5;
  --brand:#0d5c4a;--brand-ink:#0a4a3c;--accent:#0f7a63;--gold:#b7791f;
  --danger:#b3261e;--radius:14px;--shadow:0 1px 3px rgba(16,40,32,.07),0 8px 24px rgba(16,40,32,.06);
  --maxw:1080px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font:400 17px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--ink);background:var(--bg)}
h1,h2,h3{line-height:1.2;color:var(--ink);margin:0 0 .5em}
h1{font-size:clamp(1.7rem,4vw,2.5rem);letter-spacing:-.02em}
h2{font-size:clamp(1.3rem,2.5vw,1.7rem);letter-spacing:-.01em}
a{color:var(--brand-ink)}
p{margin:0 0 1em}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.section{padding:34px 0}
.muted{color:var(--muted)}
.small{font-size:.86rem}
.opt{color:var(--muted);font-weight:400;font-size:.85em}
.skip{position:absolute;left:-9999px}
.skip:focus{left:8px;top:8px;background:#fff;padding:8px 12px;z-index:20;border-radius:8px}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}

/* header */
.site-header{background:var(--brand);color:#eafaf3;position:sticky;top:0;z-index:10;box-shadow:0 1px 0 rgba(0,0,0,.15)}
.header-row{display:flex;align-items:center;gap:14px;padding:12px 20px;max-width:var(--maxw);margin:0 auto}
.brand{display:flex;align-items:center;gap:9px;font-weight:800;color:#fff;text-decoration:none;font-size:1.15rem;letter-spacing:-.01em}
.brand__mark{display:inline-grid;place-items:center;width:30px;height:30px;background:#fff;color:var(--brand);border-radius:8px;font-weight:800}
.nav{display:flex;gap:4px;margin-left:auto;flex-wrap:wrap}
.nav a{color:#d6f2e7;text-decoration:none;padding:7px 11px;border-radius:8px;font-size:.94rem;font-weight:600}
.nav a:hover{background:rgba(255,255,255,.14);color:#fff}
.nav-toggle{display:none;margin-left:auto;background:transparent;border:0;color:#fff;font-size:1.5rem;cursor:pointer}

/* hero */
.hero{background:linear-gradient(180deg,#0d5c4a,#0f7a63);color:#eafaf3;padding:40px 0 30px}
.hero h1{color:#fff}
.hero .lede{font-size:1.12rem;color:#e0f3ec;max-width:60ch;margin:0}

/* calculator */
.calc{display:grid;grid-template-columns:minmax(300px,1fr) minmax(320px,1.15fr);gap:22px;margin:-26px 0 6px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.calc__form{padding:24px}
.calc__results{padding:24px;background:#f7fbf9;border-left:1px solid var(--line)}
.field{margin-bottom:16px}
.field label{display:block;font-weight:700;margin-bottom:6px;font-size:.95rem}
.field--check label{font-weight:500;display:flex;gap:9px;align-items:flex-start;cursor:pointer}
.field--check input{margin-top:4px}
.hint{margin:5px 0 0;color:var(--muted);font-size:.82rem}
.input-money{display:flex;align-items:center;border:1.5px solid var(--line);border-radius:10px;background:#fff;overflow:hidden;transition:border-color .15s}
.input-money:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px rgba(15,122,99,.12)}
.input-money span{padding:0 4px 0 13px;color:var(--muted);font-weight:700}
.input-money input{border:0;outline:0;padding:12px 13px 12px 2px;font-size:1.05rem;width:100%;background:transparent;color:var(--ink)}
select{width:100%;padding:12px 13px;border:1.5px solid var(--line);border-radius:10px;background:#fff;font-size:1.02rem;color:var(--ink)}
select:focus{outline:0;border-color:var(--accent);box-shadow:0 0 0 3px rgba(15,122,99,.12)}

/* results */
.headline{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:18px}
.headline__item{background:#fff;border:1px solid var(--line);border-radius:12px;padding:15px 16px;display:flex;flex-direction:column;gap:2px}
.headline__item--accent{background:var(--brand);border-color:var(--brand)}
.headline__item--accent .headline__label,.headline__item--accent .headline__sub{color:#cdeee2}
.headline__item--accent .headline__num{color:#fff}
.headline__label{font-size:.78rem;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);font-weight:700}
.headline__num{font-size:1.9rem;font-weight:800;letter-spacing:-.02em;color:var(--brand-ink);font-variant-numeric:tabular-nums}
.headline__sub{font-size:.82rem;color:var(--muted)}
.breakdown{border-top:1px solid var(--line);margin-bottom:16px}
.rrow{display:flex;justify-content:space-between;gap:12px;padding:9px 0;border-bottom:1px solid var(--line)}
.rrow__label{color:var(--ink)}
.rrow__val{font-weight:700;font-variant-numeric:tabular-nums;white-space:nowrap}
.quarters{background:#fff;border:1px solid var(--line);border-radius:12px;padding:6px 14px 12px}
.quarters__head{font-weight:800;font-size:.9rem;padding:9px 0;border-bottom:1px solid var(--line);margin-bottom:4px}
.q{display:grid;grid-template-columns:34px 1fr auto;gap:8px;align-items:center;padding:7px 0}
.q__name{font-weight:800;color:var(--brand);font-size:.86rem}
.q__due{color:var(--muted);font-size:.9rem}
.q__amt{font-weight:800;font-variant-numeric:tabular-nums}
.disclaimer{margin:12px 0 0}
.calc-note{margin:2px 0 0}

/* prose + tables */
.prose{max-width:760px}
.prose ul,.prose ol{padding-left:1.2em}
.prose li{margin-bottom:.4em}
.crumbs{font-size:.85rem;color:var(--muted);margin-bottom:10px}
.crumbs a{color:var(--muted)}
.table-wrap{overflow-x:auto;margin:0 0 16px}
.data-table{width:100%;border-collapse:collapse;font-size:.95rem;background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden}
.data-table th,.data-table td{text-align:left;padding:11px 14px;border-bottom:1px solid var(--line)}
.data-table th{background:#eef5f1;font-size:.8rem;text-transform:uppercase;letter-spacing:.03em;color:var(--brand-ink)}
.data-table td{font-variant-numeric:tabular-nums}
.data-table tr:last-child td{border-bottom:0}

/* faq */
.faq details{background:#fff;border:1px solid var(--line);border-radius:12px;margin-bottom:8px;padding:2px 16px}
.faq summary{cursor:pointer;font-weight:700;padding:13px 0;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";float:right;color:var(--accent);font-weight:800}
.faq details[open] summary::after{content:"–"}
.faq p{padding:0 0 13px;margin:0;color:var(--muted)}

.section-head{display:flex;justify-content:space-between;align-items:baseline;gap:12px;flex-wrap:wrap}
.gear-section{border-top:1px solid var(--line)}
.gear-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.gear{display:flex;flex-direction:column;justify-content:space-between;gap:14px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:15px;text-decoration:none;color:var(--ink);min-height:96px;transition:border-color .15s,transform .15s}
.gear:hover{border-color:var(--accent);transform:translateY(-2px)}
.gear__title{font-weight:700;font-size:.95rem}
.gear__cta{color:var(--brand-ink);font-weight:700;font-size:.85rem}
.related-section{border-top:1px solid var(--line)}
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.related-card{display:flex;flex-direction:column;gap:6px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px;text-decoration:none;color:var(--ink);transition:border-color .15s,transform .15s}
.related-card:hover{border-color:var(--accent);transform:translateY(-2px)}
.related__tag{font-size:.7rem;text-transform:uppercase;letter-spacing:.05em;font-weight:700;color:var(--accent)}
.related__title{font-weight:700;font-size:1rem;color:var(--brand-ink)}
.related__desc{color:var(--muted);font-size:.86rem;line-height:1.5}
.src-list{list-style:none;padding:0}
.src-list li{background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px 14px;margin-bottom:8px;word-break:break-word}
.src-list a{font-size:.85rem}

/* ad */
.ad{margin:18px 0;text-align:center;min-height:90px;background:#eef5f1;border:1px dashed var(--line);border-radius:12px;padding:8px}
.ad__label{display:block;font-size:.7rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted)}

/* footer */
.site-footer{background:#0b2e26;color:#bfd8ce;margin-top:20px;padding:30px 0}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1.2fr;gap:26px}
.brand--footer{color:#fff;font-weight:800;margin-bottom:8px;display:flex;align-items:center;gap:8px}
.brand--footer .brand__mark{width:26px;height:26px}
.site-footer h3{color:#fff;font-size:.95rem;margin-bottom:10px}
.plain{list-style:none;padding:0;margin:0}
.plain li{margin-bottom:7px}
.plain a,.site-footer a{color:#9fd0bf;text-decoration:none}
.plain a:hover,.site-footer a:hover{color:#fff;text-decoration:underline}
.signup .signup-row{display:flex;gap:8px}
.signup input{flex:1;padding:11px 12px;border:1px solid #2b4c42;border-radius:9px;background:#0f382e;color:#fff}
.signup button{padding:11px 15px;background:var(--accent);color:#fff;border:0;border-radius:9px;font-weight:700;cursor:pointer;white-space:nowrap}
.signup button:hover{background:#0d5c4a}
.hp{position:absolute;left:-9999px}
.source-note{border-top:1px solid #24463c;margin-top:24px;padding-top:16px;font-size:.85rem;color:#9fb8ae}
.source-note a{color:#9fd0bf}

@media (max-width:860px){
  .calc{grid-template-columns:1fr}
  .calc__results{border-left:0;border-top:1px solid var(--line)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .gear-grid{grid-template-columns:1fr 1fr}
  .related-grid{grid-template-columns:1fr}
}
@media (max-width:640px){
  .nav-toggle{display:block}
  .nav{display:none;flex-direction:column;width:100%;margin:8px 0 0;gap:2px}
  body.nav-open .nav{display:flex}
  .headline{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .gear-grid{grid-template-columns:1fr}
}