/* StepSolver — shared styles */
@font-face{font-family:"Inter";src:url("/assets/fonts/inter.woff2") format("woff2");font-weight:100 900;font-display:swap}
@font-face{font-family:"Bricolage";src:url("/assets/fonts/bricolage-600.woff2") format("woff2");font-weight:600;font-display:swap}
@font-face{font-family:"Bricolage";src:url("/assets/fonts/bricolage-800.woff2") format("woff2");font-weight:800;font-display:swap}

:root{
  --ink:#15171C; --ink-2:#3A3E47; --muted:#4E535E; --faint:#5A5F6B;
  --paper:#FBFAF6; --card:#FFFFFF; --sand:#F2F0E9; --line:#E4E2DA; --line-2:#D9D6CC;
  --green:#1D7A4A; --green-dark:#145C37; --green-soft:#E8F3EC; --mint:#7FD3A4;
  --blue:#2D55C8; --blue-soft:#E9EEFB;
  --display:"Bricolage", "Inter", system-ui, sans-serif;
  --body:"Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --radius:18px; --wrap:1180px;
}
*,*::before,*::after{box-sizing:border-box}
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--body);font-size:17px;line-height:1.6;-webkit-font-smoothing:antialiased}
img,svg{display:block;max-width:100%}
a{color:var(--ink)}
a:hover{color:var(--green)}
:focus-visible{outline:3px solid var(--green);outline-offset:2px;border-radius:6px}
h1,h2,h3{font-family:var(--display);font-weight:800;letter-spacing:-.025em;line-height:1.08;margin:0}
h1{font-size:clamp(40px,6vw,70px);letter-spacing:-.035em;line-height:1.02}
h2{font-size:clamp(28px,3.4vw,40px)}
h3{font-size:22px;letter-spacing:-.015em}
p{margin:0}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
.section{padding-top:56px;padding-bottom:56px}
.section-head{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:16px;margin-bottom:28px}
.section-head p{color:var(--muted);margin-top:8px}
.accent{color:var(--green)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip{position:absolute;left:12px;top:-60px;background:var(--ink);color:#fff;padding:10px 16px;border-radius:10px;z-index:10}
.skip:focus{top:12px;color:#fff}

/* Header */
.site-header{border-bottom:1px solid var(--line);background:rgba(251,250,246,.92);backdrop-filter:saturate(1.4) blur(8px);position:sticky;top:0;z-index:5}
.nav{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-top:14px;padding-bottom:14px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-family:var(--display);font-weight:800;font-size:22px;letter-spacing:-.02em}
.brand:hover{color:var(--ink)}
.nav-links{display:flex;flex-wrap:wrap;align-items:center;gap:4px;font-size:15px;font-weight:500}
.nav-links a{text-decoration:none;padding:10px 12px;border-radius:10px}
.nav-links a:hover{background:var(--sand);color:var(--ink)}
.nav-links a[aria-current="page"]{color:var(--green-dark);font-weight:600}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;font:inherit;font-weight:600;font-size:16px;text-decoration:none;border:0;border-radius:12px;padding:14px 22px;cursor:pointer;min-height:48px}
.btn-dark{background:var(--ink);color:var(--paper)}
.btn-dark:hover{background:#000;color:var(--paper)}
.btn-green{background:var(--green);color:#fff}
.btn-green:hover{background:var(--green-dark);color:#fff}
.btn-light{background:var(--paper);color:var(--ink)}
.btn-light:hover{background:#fff;color:var(--ink)}
.nav-links .btn{padding:10px 18px;min-height:44px;border-radius:999px;margin-left:6px;font-size:15px}
@media (max-width:640px){
  .nav{justify-content:center}
  .nav-links{justify-content:center}
  .nav-links .nav-hide{display:none}
}

/* Hero */
.hero{display:flex;flex-wrap:wrap;gap:56px;align-items:center;padding-top:64px;padding-bottom:48px}
.hero-copy{flex:1 1 480px;min-width:0}
.hero-demo{flex:1 1 400px;min-width:0;position:relative}
.pill{display:inline-flex;align-items:center;gap:8px;font-size:14px;font-weight:600;color:var(--green-dark);background:var(--green-soft);padding:8px 14px;border-radius:999px;margin-bottom:20px}
.lead{font-size:19px;line-height:1.55;color:var(--muted);max-width:540px;margin:22px 0 28px}
.search{position:relative;max-width:560px}
.search-box{display:flex;flex-wrap:wrap;gap:8px;background:var(--card);border:1px solid var(--line-2);border-radius:16px;padding:8px;box-shadow:0 14px 30px -22px rgba(21,23,28,.4)}
.search-box:focus-within{border-color:var(--green)}
.search-field{flex:1 1 220px;display:flex;align-items:center;gap:10px;padding:0 10px}
.search-field input{flex:1 1 auto;min-width:0;border:0;outline:none;font:inherit;font-size:16px;padding:12px 0;background:transparent;color:var(--ink)}
@media (max-width:520px){.search-box .btn{flex:1 1 100%}}
.search-results{list-style:none;margin:8px 0 0;padding:6px;background:var(--card);border:1px solid var(--line);border-radius:14px;position:absolute;left:0;right:0;z-index:4;box-shadow:0 20px 40px -24px rgba(21,23,28,.45)}
.search-results[hidden]{display:none}
.search-results a{display:flex;justify-content:space-between;gap:12px;text-decoration:none;padding:12px 14px;border-radius:10px}
.search-results a:hover,.search-results a.active{background:var(--sand);color:var(--ink)}
.search-results small{color:var(--faint);font-size:13px}
.search-empty{padding:12px 14px;color:var(--muted);font-size:15px}
.chips{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-top:16px;font-size:14px}
.chips span{color:var(--faint);margin-right:4px}
.chips a{text-decoration:none;border:1px solid var(--line-2);border-radius:999px;padding:8px 14px;background:var(--card)}
.chips a:hover{border-color:var(--green)}

.demo-card{background:var(--card);border:1px solid var(--line);border-radius:22px;padding:28px;box-shadow:0 30px 60px -36px rgba(21,23,28,.45)}
.demo-top{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:14px}
.tag{font-size:13px;font-weight:600;color:var(--green-dark);background:var(--green-soft);padding:6px 10px;border-radius:999px}
.tag-blue{color:var(--blue);background:var(--blue-soft)}
.progress{display:flex;gap:4px}
.progress i{width:22px;height:5px;border-radius:3px;background:var(--ink)}
.progress i:last-child{background:var(--green)}
.demo-q{font-size:17px;font-weight:600;line-height:1.5;margin-bottom:20px}
.badge-float{position:absolute;right:-6px;bottom:-22px;background:var(--ink);color:var(--paper);border-radius:14px;padding:12px 16px;font-size:14px;font-weight:600;display:flex;align-items:center;gap:8px;box-shadow:0 14px 30px -16px rgba(21,23,28,.6)}
@media (max-width:640px){.badge-float{right:12px}}

/* Steps list */
.steps{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:14px}
.steps>li{display:flex;gap:14px}
.num{flex:0 0 28px;height:28px;border-radius:999px;background:var(--ink);color:var(--paper);font-size:13px;font-weight:600;display:flex;align-items:center;justify-content:center}
.num.final{background:var(--green);color:#fff}
.steps p{margin-top:3px;font-size:15px;color:var(--ink-2)}
.ledger{flex:1 1 auto;min-width:0;border:1px solid var(--line);border-radius:12px;overflow:hidden;font-size:15px;font-variant-numeric:tabular-nums}
.ledger div{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;padding:10px 14px;border-top:1px solid var(--line)}
.ledger div:first-child{border-top:0;background:#F4F2EC;font-weight:600}
.ledger .r{text-align:right}
.ledger .indent{padding-left:16px}

/* Cards */
.grid{display:grid;gap:20px;grid-template-columns:repeat(auto-fit,minmax(min(100%,300px),1fr))}
.grid-tight{gap:14px;grid-template-columns:repeat(auto-fit,minmax(min(100%,260px),1fr))}
.subject{text-decoration:none;border-radius:24px;padding:32px;display:flex;flex-direction:column;gap:16px}
.subject:hover{color:var(--ink);transform:translateY(-2px)}
.subject{transition:transform .15s ease}
.subject p{color:var(--ink-2);line-height:1.55}
.subject .more{font-weight:600;margin-top:auto}
.subject-green{background:var(--green-soft)}
.subject-green .more{color:var(--green-dark)}
.subject-blue{background:var(--blue-soft)}
.subject-blue .more{color:var(--blue)}
.subject-icon{width:52px;height:52px;border-radius:14px;display:flex;align-items:center;justify-content:center}
.subject-top{display:flex;justify-content:space-between;align-items:center;gap:12px;font-size:13px;font-weight:600}
.subject h3{font-size:30px}
.soon{border:1.5px dashed #CFCBBF;border-radius:24px;padding:32px;display:flex;flex-direction:column;gap:14px;justify-content:center}
.soon-tags{display:flex;flex-wrap:wrap;gap:8px;font-size:14px;color:var(--ink-2)}
.soon-tags span{background:var(--card);border:1px solid var(--line);padding:6px 12px;border-radius:999px}

.tool{text-decoration:none;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;display:flex;gap:16px;align-items:flex-start;transition:border-color .15s ease,transform .15s ease}
.tool:hover{border-color:var(--green);color:var(--ink);transform:translateY(-2px)}
.tool-icon{flex:0 0 44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center;background:var(--green-soft)}
.tool-icon.blue{background:var(--blue-soft)}
.tool b{display:block;font-size:17px;font-weight:600;line-height:1.35}
.tool small{display:block;font-size:14px;color:var(--faint);line-height:1.45;margin-top:4px}
.tool.is-soon{background:transparent;border-style:dashed;pointer-events:none}
.tool.is-soon b{color:var(--muted)}

.how{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,240px),1fr));border-top:2px solid var(--ink)}
.how li{padding:24px 24px 0 0;display:flex;flex-direction:column;gap:8px}
.how .big{font-family:var(--display);font-weight:800;font-size:44px;color:var(--green);line-height:1.1}
.how h3{font-family:var(--body);font-size:20px;font-weight:600;letter-spacing:0}
.how p{color:var(--muted)}

/* App promo */
.dark-panel{background:var(--ink);color:var(--paper);border-radius:32px;padding:clamp(28px,5vw,56px);display:flex;flex-wrap:wrap;gap:40px;align-items:center}
.dark-panel .eyebrow{font-size:14px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--mint);margin-bottom:12px}
.dark-panel h2{color:var(--paper);margin-bottom:16px}
.dark-panel p{color:#C9CBD1}
.dark-panel>div{flex:1 1 380px;min-width:0}
.app-row{text-decoration:none;color:var(--paper);background:#24272E;border-radius:18px;padding:16px 18px;display:flex;align-items:center;gap:16px;margin-bottom:12px}
.app-row:hover{background:#2C3038;color:var(--paper)}
.app-row img,.app-icon{flex:0 0 56px;width:56px;height:56px;border-radius:14px}
.app-row span.t{flex:1 1 auto;min-width:0;display:flex;flex-direction:column}
.app-row b{font-size:17px;font-weight:600}
.app-row small{font-size:14px;color:#B8BBC3}
.get{font-size:14px;font-weight:600;background:var(--paper);color:var(--ink);padding:9px 16px;border-radius:999px}

.app-cta{background:var(--ink);color:var(--paper);border-radius:26px;padding:28px 32px;display:flex;flex-wrap:wrap;gap:24px;align-items:center;justify-content:space-between}
.app-cta .who{flex:1 1 420px;min-width:0;display:flex;gap:18px;align-items:center}
.app-cta .who img{flex:0 0 60px;width:60px;height:60px;border-radius:15px}
.app-cta h2{font-size:22px;color:var(--paper);letter-spacing:-.01em;margin-bottom:4px}
.app-cta p{font-size:15px;color:#C9CBD1;line-height:1.5}

/* FAQ */
.faq{border-top:1px solid var(--line-2)}
.faq details{border-bottom:1px solid var(--line-2);padding:18px 0}
.faq summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;gap:16px;font-size:18px;font-weight:600}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--green);font-size:22px;line-height:1;transition:transform .2s ease}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details p{margin-top:10px;color:var(--muted)}

/* Tool pages */
.crumbs{font-size:14px;color:var(--faint);display:flex;flex-wrap:wrap;gap:8px;list-style:none;margin:0;padding:0}
.crumbs li+li::before{content:"/";margin-right:8px;color:var(--line-2)}
.page-head{padding-top:36px}
.page-head h1{margin-top:18px;font-size:clamp(36px,5vw,58px)}
.page-head .lead{margin:16px 0 0;max-width:700px}
.byline{margin-top:14px;font-size:14px;color:var(--faint)}
.calc{display:flex;flex-wrap:wrap;gap:24px;align-items:flex-start;padding-top:32px;padding-bottom:32px}
.calc-form{flex:1 1 340px;min-width:0;background:var(--card);border:1px solid var(--line);border-radius:24px;padding:28px;display:flex;flex-direction:column;gap:18px;box-shadow:0 24px 48px -36px rgba(21,23,28,.4)}
.calc-form h2{font-family:var(--body);font-size:18px;font-weight:600;letter-spacing:0}
.field{display:flex;flex-direction:column;gap:8px;font-size:15px;font-weight:600}
.field small{font-weight:400;color:var(--faint);font-size:13px}
.input{display:flex;align-items:center;border:1px solid #CFCBBF;border-radius:12px;background:var(--paper);padding:0 16px}
.input:focus-within{border-color:var(--green);box-shadow:0 0 0 3px rgba(29,122,74,.15)}
.input span{color:var(--faint);font-weight:500}
.input input,.input select{flex:1 1 auto;min-width:0;font:inherit;font-weight:500;font-size:18px;padding:14px 8px;border:0;outline:none;background:transparent;color:var(--ink)}
.input select{padding-left:0;cursor:pointer}
.result{background:var(--ink);color:var(--paper);border-radius:16px;padding:20px 22px;display:flex;flex-direction:column;gap:2px}
.result .label{font-size:14px;font-weight:600;color:var(--mint)}
.result .value{font-family:var(--display);font-weight:800;font-size:38px;font-variant-numeric:tabular-nums;line-height:1.15}
.result .sub{font-size:15px;color:#C9CBD1}
.solution{flex:1 1 480px;min-width:0;display:flex;flex-direction:column;gap:12px}
.solution>h2{font-size:28px;margin-bottom:4px}
.sol-steps{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:12px}
.sol-steps li{display:flex;gap:16px;background:var(--card);border:1px solid var(--line);border-radius:18px;padding:20px}
.sol-steps li.final{background:var(--green-soft);border-color:#CDE5D6}
.sol-steps .num{flex-basis:32px;height:32px;font-size:14px}
.sol-steps .body{display:flex;flex-direction:column;gap:6px;min-width:0;flex:1}
.sol-steps b{font-size:17px;font-weight:600}
.sol-steps small{font-size:14px;color:var(--faint)}
.sol-steps code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:15px;background:#F4F2EC;padding:10px 12px;border-radius:10px;color:var(--ink);overflow-x:auto;white-space:nowrap;display:block}
.sol-steps li.final code{background:#fff}
.warn{background:#FFF4E5;border-radius:16px;padding:18px 20px;font-size:15px;color:#6B3E00}
.warn[hidden]{display:none}
.table-box{overflow-x:auto;border:1px solid var(--line);border-radius:14px;background:var(--card)}
table{width:100%;border-collapse:collapse;font-size:15px;font-variant-numeric:tabular-nums}
th,td{padding:11px 14px;text-align:right;border-top:1px solid var(--line);white-space:nowrap}
th:first-child,td:first-child{text-align:left}
thead th{background:#F4F2EC;border-top:0;font-weight:600}

.article{display:flex;flex-wrap:wrap;gap:48px;align-items:flex-start;padding-top:24px;padding-bottom:64px}
.toc{flex:1 1 200px;max-width:260px;display:flex;flex-direction:column;gap:6px;font-size:15px;position:sticky;top:96px}
.toc strong{font-size:13px;text-transform:uppercase;letter-spacing:.06em;color:var(--faint);margin-bottom:4px}
.toc a{text-decoration:none;color:var(--ink-2);padding:4px 0}
@media (max-width:820px){.toc{position:static;max-width:none}}
.prose{flex:999 1 560px;min-width:0;max-width:760px;display:flex;flex-direction:column;gap:18px}
.prose h2{font-size:32px;margin-top:18px;scroll-margin-top:96px}
.prose h2:first-child{margin-top:0}
.prose p,.prose li{color:var(--ink-2);line-height:1.75}
.prose ul,.prose ol{margin:0;padding-left:22px}
.formula{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:22px 24px;display:flex;flex-direction:column;gap:8px}
.formula b{font-size:19px;font-weight:600;line-height:1.45}
.formula span{font-size:15px;color:var(--faint)}
.related{display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(min(100%,220px),1fr))}
.related a{text-decoration:none;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px;font-weight:600}
.related a:hover{border-color:var(--green)}

/* Footer */
.site-footer{background:var(--sand);border-top:1px solid var(--line);margin-top:24px}
.foot{display:grid;gap:32px;grid-template-columns:repeat(auto-fit,minmax(min(100%,180px),1fr));padding-top:56px;padding-bottom:32px;font-size:15px}
.foot div{display:flex;flex-direction:column;gap:10px}
.foot strong{font-weight:600}
.foot a{text-decoration:none;color:var(--muted)}
.foot a:hover{color:var(--green)}
.foot-brand{font-family:var(--display);font-weight:800;font-size:20px}
.copy{border-top:1px solid #DDD9CE;padding-top:20px;padding-bottom:32px;font-size:14px;color:var(--faint)}

@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}

/* Guides */
.guide-card{text-decoration:none;background:var(--card);border:1px solid var(--line);border-radius:22px;padding:26px;display:flex;flex-direction:column;gap:10px;transition:border-color .15s ease,transform .15s ease}
.guide-card:hover{border-color:var(--green);color:var(--ink);transform:translateY(-2px)}
.guide-card .meta{font-size:13px;font-weight:600;color:var(--green-dark)}
.guide-card .gt{font-family:var(--display);font-weight:800;font-size:24px;line-height:1.2;letter-spacing:-.015em}
.guide-card .ex{color:var(--muted);font-size:16px;line-height:1.55}
.guide-card .more{font-weight:600;color:var(--green-dark);margin-top:auto;padding-top:6px}
.prose h3{font-family:var(--body);font-size:20px;font-weight:600;letter-spacing:0;margin-top:10px}
.prose .table-box{margin:0}
.prose td,.prose th{color:var(--ink)}
.byline a{color:var(--faint)}
.inline-cta{display:flex;flex-wrap:wrap;align-items:center;gap:16px;background:var(--green-soft);border:1px solid #CDE5D6;border-radius:20px;padding:20px 22px;margin:8px 0}
.inline-cta img{flex:0 0 52px;width:52px;height:52px;border-radius:13px}
.inline-cta div{flex:1 1 260px;min-width:0}
.inline-cta b{display:block;font-size:17px}
.inline-cta p{font-size:15px;line-height:1.5;color:#2F4A3A;margin-top:2px}