/* RaceCombo — design system. Asphalt + racing amber. No images, one palette. */
:root{
  --asphalt:#101216; --asphalt-2:#171a1f; --asphalt-3:#0b0c0e;
  --paper:#f7f4ee; --paper-2:#fffdf8; --line:#e3ded2; --line-dark:#262a31;
  --ink:#191c20; --ink-soft:#454b53; --muted:#6d7278;
  --amber:#f2a007; --amber-deep:#c77f02; --amber-soft:#fdf3dd;
  --green:#1d9e5f; --green-bright:#22b573; --red:#cf4444;
  --radius:14px; --radius-s:10px;
  --shadow:0 10px 30px rgba(16,18,22,.10);
  --mono:ui-monospace,"SF Mono","Cascadia Mono",Menlo,Consolas,monospace;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Inter,Roboto,"Helvetica Neue",Arial,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--sans);background:var(--paper);color:var(--ink);line-height:1.6;font-size:17px;-webkit-font-smoothing:antialiased}
img,svg{display:inline-block;vertical-align:middle}
a{color:var(--amber-deep);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
h1,h2,h3{line-height:1.15;letter-spacing:-.02em;margin:0 0 .5em;color:var(--ink)}
h1{font-size:clamp(2rem,5.2vw,3.3rem);font-weight:850}
h2{font-size:clamp(1.5rem,3.4vw,2.1rem);font-weight:800;margin-top:1.6em}
h3{font-size:1.16rem;font-weight:750;margin-top:1.3em}
p{margin:0 0 1em}
.lede{font-size:1.14rem;color:var(--ink-soft)}
.small{font-size:.88rem;color:var(--muted)}
.mono{font-family:var(--mono)}
strong{font-weight:700}

/* ---------- header ---------- */
.site-header{background:var(--asphalt);color:#f3efe6}
.site-header .wrap{display:flex;align-items:center;gap:22px;padding-top:14px;padding-bottom:14px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:11px;color:#f7f4ee;font-weight:850;font-size:1.28rem;letter-spacing:-.02em}
.brand:hover{text-decoration:none}
.brand .mark{flex:none}
.brand em{font-style:normal;color:var(--amber)}
.main-nav{margin-left:auto;display:flex;gap:4px;flex-wrap:wrap}
.main-nav a{color:#d9d4c7;padding:8px 12px;border-radius:8px;font-size:.97rem;font-weight:600}
.main-nav a:hover{background:var(--asphalt-2);text-decoration:none;color:#fff}

/* ---------- hero ---------- */
.hero{background:linear-gradient(180deg,var(--asphalt) 0%,var(--asphalt-2) 100%);color:#f3efe6;padding:54px 0 58px;border-bottom:4px solid var(--amber)}
.hero .tagline{color:var(--amber);font-weight:800;text-transform:uppercase;letter-spacing:.14em;font-size:.83rem;margin:0 0 14px}
.hero h1{color:#fff}
.hero .lede{color:#cfc9ba;max-width:44em}
.hero .cta-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}
.btn{display:inline-block;background:var(--amber);color:#191203;font-weight:750;padding:13px 22px;border-radius:11px;border:2px solid var(--amber);font-size:1rem;cursor:pointer;text-align:center}
.btn:hover{background:var(--amber-bright,#ffb92e);text-decoration:none}
.btn.ghost{background:transparent;color:#f3efe6;border-color:#4a4f58}
.btn.ghost:hover{border-color:var(--amber);color:var(--amber)}
.btn.dark{background:var(--asphalt);border-color:var(--asphalt);color:#f7f4ee}
.btn.block{display:block;width:100%}
.hero-stats{display:flex;gap:34px;flex-wrap:wrap;margin-top:36px}
.hero-stats .stat{min-width:0}
.hero-stats .num{font-family:var(--mono);font-size:1.55rem;font-weight:700;color:#fff}
.hero-stats .lbl{font-size:.85rem;color:#a49d8d;text-transform:uppercase;letter-spacing:.08em}

/* ---------- sections / cards ---------- */
.section{padding:46px 0}
.section.alt{background:var(--paper-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section.dark{background:var(--asphalt);color:#e9e4d8}
.section.dark h2,.section.dark h3{color:#fff}
.section.dark .lede{color:#c9c2b2}
.eyebrow{color:var(--amber-deep);font-weight:800;text-transform:uppercase;letter-spacing:.13em;font-size:.78rem;margin:0 0 8px}
.section.dark .eyebrow{color:var(--amber)}
.grid{display:grid;gap:18px}
.grid.c2{grid-template-columns:repeat(2,1fr)}
.grid.c3{grid-template-columns:repeat(3,1fr)}
.grid.c4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--paper-2);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.card h3{margin-top:0}
.card p:last-child{margin-bottom:0}
a.card{color:var(--ink);display:block}
a.card:hover{text-decoration:none;border-color:var(--amber);transform:translateY(-2px);transition:transform .15s ease,border-color .15s ease}
.card .go{color:var(--amber-deep);font-weight:700;font-size:.93rem}
.tool-card .t{font-weight:800;font-size:1.08rem;letter-spacing:-.01em}
.tool-card .d{color:var(--ink-soft);font-size:.95rem;margin-top:4px}

/* ---------- calculator shell ---------- */
.calc-shell{background:var(--paper-2);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;margin:26px 0}
.calc-head{background:var(--asphalt);color:#f3efe6;padding:18px 24px;display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.calc-head .ttl{font-weight:800;font-size:1.12rem;color:#fff;min-width:0;overflow-wrap:anywhere}
.calc-head .combo-note{margin-left:auto;font-size:.85rem;color:#bdb5a2;min-width:0;overflow-wrap:anywhere}
.calc-head .combo-note a{color:var(--amber)}
.calc-body{display:grid;grid-template-columns:1fr 1fr;gap:0}
.calc-form{padding:24px;border-right:1px solid var(--line)}
.calc-result{padding:24px;background:var(--amber-soft)}
.field{margin-bottom:16px}
.field label{display:block;font-weight:650;font-size:.92rem;margin-bottom:6px}
.field .hint{font-weight:400;color:var(--muted);font-size:.83rem}
.field input,.field select{width:100%;font-size:16px;padding:11px 12px;border:1.5px solid #cfc9ba;border-radius:9px;background:#fff;font-family:inherit;color:var(--ink)}
.field input:focus,.field select:focus{outline:2px solid var(--amber);border-color:var(--amber)}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.calc-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:6px}
.result-title{font-weight:800;text-transform:uppercase;letter-spacing:.1em;font-size:.76rem;color:var(--amber-deep);margin:0 0 12px}
.result-rows{display:flex;flex-direction:column;gap:10px}
.result-rows .row{display:flex;gap:14px;align-items:baseline}
.result-rows .k{flex:0 0 44%;font-size:.92rem;color:var(--ink-soft);font-weight:600;min-width:0}
.result-rows .v{flex:1;min-width:0;overflow-wrap:anywhere;font-family:var(--mono);font-weight:700;font-size:1.06rem}
.result-big{font-family:var(--mono);font-size:2rem;font-weight:800;line-height:1.1;overflow-wrap:anywhere}
.result-note{font-size:.9rem;color:var(--ink-soft);margin-top:12px}
.formula-box{background:#fff;border:1px dashed #d8d2c2;border-radius:9px;padding:12px 14px;font-family:var(--mono);font-size:.86rem;margin-top:16px;overflow-wrap:anywhere;color:var(--ink-soft)}
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:14px 0}
table.tbl{border-collapse:collapse;width:100%;font-size:.95rem;background:#fff}
table.tbl th,table.tbl td{border:1px solid var(--line);padding:9px 12px;text-align:left;vertical-align:top}
table.tbl th{background:var(--asphalt);color:#f3efe6;font-weight:700}
table.tbl td.num,table.tbl th.num{font-family:var(--mono);white-space:nowrap}
table.tbl tr:nth-child(even) td{background:#faf7f0}

/* ---------- combo ---------- */
.combo-banner{background:var(--asphalt-2);border:1px solid var(--line-dark);color:#e9e4d8;border-radius:var(--radius);padding:22px 24px}
.combo-banner h3{color:#fff;margin-top:0}
.combo-banner p{color:#c9c2b2}
.combo-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}

/* ---------- lock panels / pricing ---------- */
.lock-panel{border:1.5px dashed #c9b98a;background:#fffaf0;border-radius:var(--radius);padding:22px;position:relative;color:var(--ink)}
.lock-panel h3{margin-top:0}
.section .lock-panel h3,.section.dark .lock-panel h3{color:var(--ink)}
.lock-panel p{color:var(--ink-soft)}
.lock-panel .incl{font-weight:800;color:var(--amber-deep);font-size:.9rem;text-transform:uppercase;letter-spacing:.07em}
.price-card{background:var(--paper-2);border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow);display:flex;flex-direction:column}
.price-card.featured{border:2px solid var(--amber)}
.price-card .price{font-family:var(--mono);font-size:2.1rem;font-weight:800}
.price-card .per{color:var(--muted);font-size:.9rem}
.price-card ul{margin:12px 0 18px;padding-left:19px;color:var(--ink-soft)}
.price-card ul li{margin-bottom:6px}
.price-card .btn{margin-top:auto}
.badge{display:inline-block;background:var(--amber);color:#191203;font-weight:800;font-size:.72rem;text-transform:uppercase;letter-spacing:.08em;padding:3px 9px;border-radius:99px;margin-bottom:10px}

/* ---------- kit tools ---------- */
.kit-tool{background:var(--paper-2);border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);margin:22px 0}
.kit-tool h3{margin-top:0}
.checkline{display:flex;gap:12px;padding:10px 0;border-bottom:1px solid var(--line)}
.checkline:last-child{border-bottom:none}
.checkline>div{flex:1;min-width:0;overflow-wrap:anywhere}
.print-note{font-size:.85rem;color:var(--muted)}

/* ---------- footer ---------- */
.site-footer{background:var(--asphalt-3);color:#b9b2a1;padding:44px 0 30px;margin-top:0}
.site-footer .cols{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:26px}
.site-footer h4{color:#f3efe6;margin:0 0 10px;font-size:.95rem;text-transform:uppercase;letter-spacing:.09em}
.site-footer a{color:#b9b2a1;display:block;padding:3px 0;font-size:.95rem}
.site-footer a:hover{color:var(--amber)}
.site-footer .brandline{color:#8f897b;font-size:.9rem;max-width:34em}
.site-footer .legal{border-top:1px solid var(--line-dark);margin-top:30px;padding-top:18px;font-size:.85rem;color:#7d7769;display:flex;gap:18px;flex-wrap:wrap}
.site-footer .legal a{display:inline;padding:0}

/* ---------- misc ---------- */
.pill-row{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0}
.pill{background:#fff;border:1px solid var(--line);border-radius:99px;padding:6px 14px;font-size:.88rem;font-weight:600;color:var(--ink-soft)}
.pill:hover{border-color:var(--amber);text-decoration:none;color:var(--ink)}
.search-box{width:100%;font-size:16px;padding:13px 16px;border:1.5px solid #cfc9ba;border-radius:11px;background:#fff;margin:8px 0 18px}
.callout{background:var(--amber-soft);border-left:4px solid var(--amber);border-radius:0 var(--radius-s) var(--radius-s) 0;padding:16px 20px;margin:20px 0}
.callout p:last-child{margin-bottom:0}
.prose{max-width:46em}
.prose ul,.prose ol{margin:0 0 1em;padding-left:22px}
.prose li{margin-bottom:.4em}
.crumb{font-size:.88rem;color:var(--muted);margin:20px 0 4px}
.crumb a{color:var(--muted)}
.hidden{display:none!important}
@media print{.site-header,.site-footer,.no-print{display:none!important}body{background:#fff}}

/* ---------- responsive ---------- */
@media (max-width:900px){
  .grid.c4{grid-template-columns:repeat(2,1fr)}
  .grid.c3{grid-template-columns:repeat(2,1fr)}
  .combo-grid{grid-template-columns:repeat(2,1fr)}
  .site-footer .cols{grid-template-columns:1fr 1fr}
}
@media (max-width:640px){
  body{font-size:16px}
  .grid.c2,.grid.c3,.grid.c4{grid-template-columns:1fr}
  .combo-grid{grid-template-columns:1fr}
  .calc-body{grid-template-columns:1fr}
  .calc-form{border-right:none;border-bottom:1px solid var(--line)}
  .field-row{grid-template-columns:1fr}
  .result-rows .row{flex-direction:column;gap:2px}
  .result-rows .k{flex:none;font-size:.8rem;text-transform:uppercase;letter-spacing:.06em}
  .hero{padding:38px 0 42px}
  .hero-stats{gap:20px}
  .calc-head .combo-note{margin-left:0;width:100%}
  .site-footer .cols{grid-template-columns:1fr}
  .main-nav{margin-left:0}
  .section{padding:34px 0}
}

/* definition strip on calculator pages (AI-citable definition + formula) */
.defbox{max-width:860px;margin:18px auto 0;background:#171a1f;border:1px solid #262a31;border-left:4px solid var(--amber);border-radius:10px;padding:16px 20px}
.defbox .def{margin:0;font-size:1.02rem;line-height:1.55;color:#f0ead9}
.defbox .fx{margin:8px 0 0;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:.86rem;color:#b8bdc7;overflow-wrap:anywhere}
.guidelink{max-width:860px;margin:10px auto 0}

/* ---------- cross-promo: Garage math family (RegearReady) ---------- */
.site-footer .family{border-top:1px solid var(--line-dark);margin-top:26px;padding-top:18px}
.site-footer .family h4{color:#f3efe6;margin:0 0 6px;font-size:.95rem;text-transform:uppercase;letter-spacing:.09em}
.site-footer .family p{color:#b9b2a1;font-size:.95rem;margin:0;max-width:56em}
.site-footer .family a{display:inline;padding:0;color:#b9b2a1}
.site-footer .family a:hover{color:var(--amber)}
.callout.sister{color:var(--ink)}
.callout.sister p{color:var(--ink)}
.callout.sister a{color:var(--amber-deep)}
.callout.kit-cross{color:var(--ink)}
.callout.kit-cross p{color:var(--ink)}
.callout.kit-cross a{color:var(--amber-deep)}