/* RandMath — design system
   Paper + ink + one green. Serif for authority, sans for data. */

:root{
  --paper:#faf8f3;
  --paper-2:#f2eee4;
  --card:#ffffff;
  --ink:#141c18;
  --ink-2:#4a564f;
  --ink-3:#7b857e;
  --line:#e3ddd0;
  --line-2:#d2cbba;
  --green:#0e5c3a;
  --green-2:#1a7f52;
  --green-wash:#eaf3ed;
  --gold:#a8802a;
  --red:#8f2d1f;
  --radius:14px;
  --shadow:0 1px 2px rgba(20,28,24,.05), 0 8px 24px -12px rgba(20,28,24,.14);
  --serif:ui-serif, "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans:system-ui, -apple-system, "Segoe UI", Inter, Roboto, "Helvetica Neue", sans-serif;
  --mono:ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%}
a{color:var(--green);text-decoration-thickness:1px;text-underline-offset:2px}
a:hover{color:var(--green-2)}
h1,h2,h3,h4{font-family:var(--serif);font-weight:600;letter-spacing:-.015em;line-height:1.15;margin:0 0 .5em}
h1{font-size:clamp(2rem,4.6vw,3.15rem)}
h2{font-size:clamp(1.4rem,2.6vw,1.95rem)}
h3{font-size:1.2rem}
p{margin:0 0 1em}
.wrap{width:min(1080px,calc(100% - 2.5rem));margin-inline:auto}
.narrow{width:min(740px,calc(100% - 2.5rem));margin-inline:auto}
.muted{color:var(--ink-2)}
.small{font-size:.88rem}
.tiny{font-size:.78rem;line-height:1.5}
.num{font-variant-numeric:tabular-nums;font-feature-settings:"tnum" 1}

/* ---------- header ---------- */
.site-head{border-bottom:1px solid var(--line);background:rgba(250,248,243,.9);backdrop-filter:blur(8px);position:sticky;top:0;z-index:50}
.site-head .wrap{display:flex;align-items:center;gap:1.4rem;height:64px}
.brand{display:flex;align-items:center;gap:.55rem;font-family:var(--serif);font-size:1.2rem;font-weight:600;color:var(--ink);text-decoration:none;letter-spacing:-.02em}
.brand-mark{width:26px;height:26px;border-radius:50%;background:var(--green);color:#fff;display:grid;place-items:center;font-size:.82rem;font-family:var(--sans);font-weight:700;flex:0 0 auto}
.brand span.dot{color:var(--green-2)}
.nav{margin-left:auto;display:flex;gap:1.15rem;align-items:center;font-size:.93rem}
.nav a{color:var(--ink-2);text-decoration:none}
.nav a:hover{color:var(--ink)}
.nav a[aria-current="page"]{color:var(--ink);font-weight:600}
.nav .cta{padding:.5rem .85rem;border-radius:9px;background:var(--green);color:#fff;font-weight:600}
.nav .cta:hover{background:var(--green-2);color:#fff}
@media(max-width:820px){
  .site-head{position:static}
  .site-head .wrap{height:auto;padding:.6rem 0 .55rem;flex-wrap:wrap;row-gap:.5rem}
  .nav{width:100%;margin-left:0;flex-wrap:wrap;gap:.5rem .95rem;font-size:.88rem}
  .nav .cta{padding:.38rem .75rem;font-size:.85rem}
  h1{font-size:clamp(1.85rem,7vw,2.6rem)}
  table.data{font-size:.82rem}
  table.data th,table.data td{padding:.45rem .35rem}
  .result{position:static}
}
@media(max-width:420px){
  .field .hint{font-size:.74rem}
}

/* ---------- hero ---------- */
.hero{padding:clamp(2.2rem,5vw,3.6rem) 0 1rem}
.hero p.lede{font-size:clamp(1.05rem,1.7vw,1.28rem);color:var(--ink-2);max-width:56ch}
.eyebrow{font-size:.76rem;text-transform:uppercase;letter-spacing:.14em;color:var(--green);font-weight:700;margin:0 0 .9rem}

/* ---------- cards / grids ---------- */
.grid{display:grid;gap:1rem}
.grid.three{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.grid.two{grid-template-columns:repeat(auto-fit,minmax(320px,1fr))}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:1.35rem;box-shadow:var(--shadow)}
a.card{display:block;color:inherit;text-decoration:none;transition:transform .12s ease, border-color .12s ease}
a.card:hover{transform:translateY(-2px);border-color:var(--line-2)}
a.card h3{margin-bottom:.35rem}
a.card p{margin:0;color:var(--ink-2);font-size:.94rem}
.card .go{display:inline-block;margin-top:.85rem;font-size:.85rem;font-weight:600;color:var(--green)}

/* ---------- calculator ---------- */
.calc{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,.92fr);gap:1.1rem;align-items:start;margin-top:1.6rem}
@media(max-width:880px){.calc{grid-template-columns:1fr}}
.calc .panel{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:1.4rem;box-shadow:var(--shadow)}
.field{margin-bottom:1.15rem}
.field:last-child{margin-bottom:0}
.field label{display:block;font-size:.83rem;font-weight:650;letter-spacing:.01em;color:var(--ink-2);margin-bottom:.35rem}
.field .hint{font-size:.76rem;color:var(--ink-3);font-weight:400;margin-top:.3rem;display:block}
.inp{position:relative;display:flex;align-items:center;background:#fdfcf9;border:1px solid var(--line-2);border-radius:10px;transition:border-color .12s, box-shadow .12s}
.inp:focus-within{border-color:var(--green-2);box-shadow:0 0 0 3px rgba(26,127,82,.13)}
.inp .pre,.inp .suf{padding:0 .7rem;color:var(--ink-3);font-size:.9rem;font-weight:600;user-select:none}
.inp .pre{border-right:1px solid var(--line)}
.inp .suf{border-left:1px solid var(--line)}
.inp input{flex:1;min-width:0;border:0;background:transparent;font-family:var(--sans);font-size:1.05rem;font-weight:600;font-variant-numeric:tabular-nums;color:var(--ink);padding:.72rem .75rem;outline:none}
.inp input::-webkit-outer-spin-button,.inp input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}
.inp input[type=number]{-moz-appearance:textfield;appearance:textfield}
select.inp-select{width:100%;font-family:var(--sans);font-size:1rem;font-weight:600;color:var(--ink);background:#fdfcf9;border:1px solid var(--line-2);border-radius:10px;padding:.72rem .75rem;appearance:none;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%237b857e' stroke-width='2.5'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right .8rem center}
select.inp-select:focus{outline:none;border-color:var(--green-2);box-shadow:0 0 0 3px rgba(26,127,82,.13)}
.chips{display:flex;flex-wrap:wrap;gap:.4rem;margin-top:.5rem}
.chip{font-family:var(--sans);font-size:.8rem;font-weight:600;padding:.3rem .65rem;border-radius:999px;border:1px solid var(--line-2);background:#fdfcf9;color:var(--ink-2);cursor:pointer}
.chip:hover{border-color:var(--green-2);color:var(--green)}

/* results */
.result{position:sticky;top:80px}
@media(max-width:880px){.result{position:static}}
.result .hero-num{font-family:var(--serif);font-size:clamp(2.1rem,5vw,2.9rem);line-height:1;letter-spacing:-.02em;font-variant-numeric:tabular-nums;color:var(--ink);margin:.15rem 0 .1rem}
.result .hero-num .cur{font-size:.5em;color:var(--ink-3);vertical-align:.45em;margin-right:.15em;font-family:var(--sans);font-weight:600}
.result .cap{font-size:.8rem;text-transform:uppercase;letter-spacing:.1em;color:var(--ink-3);font-weight:700}
.breakdown{list-style:none;margin:1.2rem 0 0;padding:1.1rem 0 0;border-top:1px solid var(--line)}
.breakdown li{display:flex;justify-content:space-between;gap:1rem;padding:.42rem 0;font-size:.94rem}
.breakdown li .k{color:var(--ink-2)}
.breakdown li .v{font-weight:650;font-variant-numeric:tabular-nums;white-space:nowrap}
.breakdown li.total{border-top:1px solid var(--line);margin-top:.5rem;padding-top:.7rem;font-size:1.02rem}
.breakdown li.total .v{font-size:1.1rem;color:var(--green)}
.breakdown li.sub .k{padding-left:.9rem;font-size:.88rem;color:var(--ink-3)}
.breakdown li.sub .v{font-weight:500;color:var(--ink-2);font-size:.9rem}
.verdict{margin-top:1rem;padding:.7rem .9rem;border-radius:10px;background:var(--green-wash);color:#0b4a2f;font-size:.9rem;font-weight:600}
.verdict.warn{background:#fdf1e7;color:#8a4b16}

/* bars */
.bar{height:9px;border-radius:99px;background:var(--paper-2);overflow:hidden;display:flex;margin-top:.6rem}
.bar span{display:block;height:100%}
.bar .b-int{background:var(--green)}
.bar .b-prin{background:#bcd8c8}
.legend{display:flex;gap:1rem;font-size:.78rem;color:var(--ink-2);margin-top:.45rem}
.legend i{display:inline-block;width:9px;height:9px;border-radius:3px;margin-right:.35rem}

/* table */
table.data{width:100%;border-collapse:collapse;font-size:.9rem;margin:.4rem 0 0}
table.data th,table.data td{text-align:right;padding:.5rem .55rem;border-bottom:1px solid var(--line);font-variant-numeric:tabular-nums}
table.data th{font-size:.75rem;text-transform:uppercase;letter-spacing:.07em;color:var(--ink-3);font-weight:700;border-bottom:1px solid var(--line-2)}
table.data th:first-child,table.data td:first-child{text-align:left}
table.data tr:last-child td{border-bottom:0}
table.data .accent td{background:var(--green-wash);font-weight:650}

/* prose */
.prose{max-width:68ch}
.prose h2{margin-top:2.2rem}
.prose h3{margin-top:1.6rem}
.prose ul,.prose ol{padding-left:1.15rem;margin:0 0 1em}
.prose li{margin-bottom:.4rem}
.prose strong{font-weight:650}
.callout{border-left:3px solid var(--green);background:var(--green-wash);padding:.85rem 1rem;border-radius:0 10px 10px 0;font-size:.92rem;margin:1.2rem 0}
.callout.warn{border-left-color:var(--gold);background:#fbf4e6}

/* ads + affiliate */
.ad-slot{margin:1.8rem 0;min-height:0;text-align:center}
.ad-slot[data-state="empty"]{display:none}
.affiliate{border:1px solid var(--line-2);border-radius:var(--radius);padding:1.1rem 1.2rem;background:linear-gradient(180deg,#fffdf8,#f7f3e9);display:flex;gap:1rem;align-items:center;flex-wrap:wrap;margin:1.6rem 0}
.affiliate .txt{flex:1 1 320px}
.affiliate h4{margin:0 0 .25rem;font-family:var(--serif);font-size:1.05rem}
.affiliate p{margin:0;font-size:.88rem;color:var(--ink-2)}
.btn{display:inline-block;font-family:var(--sans);font-size:.92rem;font-weight:650;padding:.68rem 1.1rem;border-radius:10px;background:var(--green);color:#fff;text-decoration:none;border:0;cursor:pointer;transition:background .12s}
.btn:hover{background:var(--green-2);color:#fff}
.btn.ghost{background:transparent;color:var(--green);border:1px solid var(--line-2)}
.btn.ghost:hover{border-color:var(--green-2);background:var(--green-wash)}
.btn:disabled{opacity:.6;cursor:progress}

/* forms */
.lead-form .row{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
@media(max-width:640px){.lead-form .row{grid-template-columns:1fr}}
.lead-form input[type=text],.lead-form input[type=email],.lead-form input[type=tel],.lead-form textarea,.lead-form select{width:100%;font-family:var(--sans);font-size:1rem;padding:.72rem .8rem;border:1px solid var(--line-2);border-radius:10px;background:#fdfcf9;color:var(--ink);outline:none}
.lead-form input:focus,.lead-form textarea:focus,.lead-form select:focus{border-color:var(--green-2);box-shadow:0 0 0 3px rgba(26,127,82,.13)}
.lead-form label{display:block;font-size:.83rem;font-weight:650;color:var(--ink-2);margin-bottom:.35rem}
.lead-form .field{margin-bottom:1rem}
.formnote{font-size:.78rem;color:var(--ink-3)}
.status{margin-top:.9rem;font-size:.9rem;font-weight:600}
.status.ok{color:var(--green)}
.status.err{color:var(--red)}

/* footer */
.site-foot{border-top:1px solid var(--line);margin-top:3.5rem;padding:2.2rem 0 3rem;font-size:.87rem;color:var(--ink-2)}
.site-foot .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:2rem}
@media(max-width:760px){.site-foot .cols{grid-template-columns:1fr 1fr}}
.site-foot h5{font-family:var(--sans);font-size:.76rem;text-transform:uppercase;letter-spacing:.1em;color:var(--ink-3);margin:0 0 .7rem;font-weight:700}
.site-foot ul{list-style:none;padding:0;margin:0}
.site-foot li{margin-bottom:.4rem}
.site-foot a{color:var(--ink-2);text-decoration:none}
.site-foot a:hover{color:var(--ink)}
.site-foot .legal{border-top:1px solid var(--line);margin-top:1.8rem;padding-top:1.2rem;display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;font-size:.8rem;color:var(--ink-3)}

.skip{position:absolute;left:-9999px}
.skip:focus{left:1rem;top:1rem;background:#fff;padding:.6rem .9rem;border-radius:8px;z-index:99}
.disclaimer{font-size:.79rem;color:var(--ink-3);line-height:1.55;border-top:1px solid var(--line);margin-top:1.4rem;padding-top:.9rem}