/* Diacre Bayishime brand — Cal Sans + Inter, electric blue with a blue→amber accent */
:root{
  --ink:#020817; --ink-2:#0F172A; --muted:#475569; --soft:#64748B;
  --line:#E2E8F0; --wash:#F1F5F9; --paper:#FFFFFF;
  --blue:#3B82F6; --blue-600:#2563EB; --blue-700:#1D4ED8; --blue-50:#EFF6FF; --blue-100:#DBEAFE;
  --amber:#F59E0B; --amber-300:#FCD34D; --amber-50:#FFFBEB; --amber-700:#B45309;
  --green:#059669; --green-50:#ECFDF5; --red:#DC2626;
  --grad:linear-gradient(90deg,#3B82F6,#60A5FA,#FCD34D,#F59E0B);
  --display:"Cal Sans","Poppins",Inter,system-ui,sans-serif;
  --sans:Inter,system-ui,-apple-system,"Segoe UI",sans-serif;
  --radius:14px; --top:68px;
}
*{box-sizing:border-box}
html{scroll-padding-top:calc(var(--top) + 16px);-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}
body{margin:0;font:400 17px/1.7 var(--sans);color:var(--ink);background:var(--paper);font-feature-settings:"cv11","ss01"}
a{color:var(--blue-600);text-underline-offset:.2em;text-decoration-thickness:1px;overflow-wrap:anywhere}
a:hover{color:var(--blue-700);text-decoration-thickness:2px}
:focus-visible{outline:3px solid var(--amber);outline-offset:3px;border-radius:4px}
q{quotes:"“" "”"; font-style:normal; color:var(--ink-2)}
.skip{position:fixed;left:1rem;top:-5rem;background:#fff;padding:.8rem 1rem;z-index:20;border-radius:8px;box-shadow:0 4px 20px rgba(2,8,23,.15)}
.skip:focus{top:.6rem}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* progress */
.progress{position:fixed;inset:0 0 auto 0;height:3px;z-index:12;background:transparent}
.progress span{display:block;height:100%;width:0;background:var(--grad)}

/* header */
.top{position:sticky;top:0;z-index:10;height:var(--top);display:flex;align-items:center;gap:18px;padding:0 clamp(16px,3vw,32px);
  background:rgba(255,255,255,.86);backdrop-filter:saturate(1.6) blur(12px);-webkit-backdrop-filter:saturate(1.6) blur(12px);border-bottom:1px solid var(--line)}
.brand{font:700 21px/1 "Poppins",var(--sans);letter-spacing:-.02em;color:var(--ink);text-decoration:none}
.brand-d{color:var(--blue)}
.top-title{font:500 14px/1.2 var(--sans);color:var(--muted);padding-left:18px;border-left:1px solid var(--line)}
.top-actions{margin-left:auto;display:flex;gap:10px;align-items:center}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:42px;padding:0 18px;border-radius:8px;font:600 15px/1 var(--sans);text-decoration:none;cursor:pointer;border:1px solid transparent;transition:background .15s,border-color .15s,color .15s,transform .15s}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-600);color:#fff}
.btn-ghost{background:#fff;color:var(--blue-600);border-color:var(--blue)}
.btn-ghost:hover{background:var(--blue-50)}
.btn-lg{min-height:50px;padding:0 22px;font-size:16px}
.btn[hidden]{display:none}

/* layout */
.layout{display:grid;grid-template-columns:292px minmax(0,1fr);max-width:1360px;margin:0 auto}
aside{position:sticky;top:var(--top);align-self:start;max-height:calc(100dvh - var(--top));overflow:auto;padding:26px 18px 40px 22px;border-right:1px solid var(--line);scrollbar-width:thin}
#reading-position{margin:0 0 14px;padding:10px 12px;border-radius:10px;background:var(--blue-50);color:var(--blue-700);font:600 13px/1.4 var(--sans)}
summary{cursor:pointer}
aside summary{font:600 18px/1.3 var(--display);letter-spacing:.005em;min-height:36px;list-style:none}
aside summary::-webkit-details-marker{display:none}
aside summary span{display:block;font:400 12.5px/1.4 var(--sans);color:var(--soft);margin:4px 0 8px}
nav{display:grid;gap:1px}
.nav-part{margin:18px 0 6px;padding:0 10px;font:700 11px/1.3 var(--sans);letter-spacing:.08em;text-transform:uppercase;color:var(--soft)}
nav a{display:flex;gap:10px;align-items:baseline;padding:7px 10px;border-radius:8px;font:500 14px/1.4 var(--sans);color:var(--ink-2);text-decoration:none}
nav a:hover{background:var(--wash);color:var(--ink)}
nav a[aria-current]{background:var(--blue);color:#fff}
.nav-n{flex:0 0 1.5em;font-weight:600;color:var(--soft);font-variant-numeric:tabular-nums}
nav a[aria-current] .nav-n{color:#DBEAFE}
main{min-width:0;padding:0 clamp(20px,5vw,72px) 0}

/* hero */
.hero{position:relative;margin:0 calc(-1 * clamp(20px,5vw,72px));padding:clamp(48px,7vw,92px) clamp(20px,5vw,72px) clamp(40px,5vw,64px);
  background:radial-gradient(60% 80% at 15% 10%,#E0E7FF 0,transparent 60%),radial-gradient(50% 70% at 90% 20%,#FDE7D5 0,transparent 60%),radial-gradient(60% 60% at 60% 100%,#F3E8FF 0,transparent 70%),#FAFAFF;border-bottom:1px solid var(--line)}
.eyebrow{margin:0 0 18px;font:600 14px/1.4 var(--sans);color:var(--blue)}
h1{font:400 clamp(40px,5.6vw,76px)/1.02 var(--display);letter-spacing:-.02em;margin:0 0 24px;max-width:15ch;color:var(--ink)}
.grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.deck{font-size:clamp(19px,1.8vw,23px);line-height:1.55;max-width:36em;color:var(--ink-2);margin:0 0 28px}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px;margin:0 0 30px}
.hero-facts{list-style:none;display:flex;flex-wrap:wrap;gap:10px;padding:0;margin:0 0 26px}
.hero-facts li{padding:8px 14px;border-radius:999px;background:rgba(255,255,255,.75);border:1px solid var(--line);font:500 14px/1.3 var(--sans);color:var(--muted)}
.hero-facts strong{color:var(--ink);font-weight:700}
.byline{font-size:14.5px;color:var(--muted);max-width:52em;margin:0}

/* sections */
section{padding:56px 0 36px;border-bottom:1px solid var(--line)}
h2{font:400 clamp(28px,3vw,38px)/1.15 var(--display);letter-spacing:-.01em;margin:0 0 20px;color:var(--ink)}
h3{font:600 19px/1.35 var(--sans);margin:0 0 12px;color:var(--ink)}
h4{font:600 15px/1.4 var(--sans);margin:18px 0 8px;color:var(--ink-2)}
section p,section li{max-width:72ch}
section p{margin:0 0 18px}
.note{font-size:14.5px;line-height:1.6;color:var(--muted)}
.small{font-size:14.5px;line-height:1.6;color:var(--muted)}
.back{display:inline-block;margin-top:18px;font:500 13px/1 var(--sans);color:var(--soft);text-decoration:none}
.back:hover{color:var(--blue-600)}

/* part dividers */
.part{margin:0 calc(-1 * clamp(20px,5vw,72px));padding:56px clamp(20px,5vw,72px) 40px;background:linear-gradient(180deg,var(--blue-50),#fff);border-bottom:1px solid var(--line)}
.part-k{margin:0 0 8px;font:700 12px/1 var(--sans);letter-spacing:.1em;text-transform:uppercase;color:var(--blue)}
.part-title{font-size:clamp(34px,4vw,52px);margin:0 0 10px}
.part p:last-child{margin:0;color:var(--muted);font-size:18px;max-width:52ch}

/* chapter */
.ch-head{display:grid;grid-template-columns:auto 1fr;gap:20px;align-items:start;margin-bottom:26px}
.ch-num{font:400 56px/0.9 var(--display);background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;min-width:1.25em;padding-top:2px}
.ch-head h2{margin:0 0 10px}
.goal{margin:0;font-size:19px;line-height:1.5;color:var(--ink-2);font-weight:500}
.steps{list-style:none;counter-reset:s;padding:0;margin:0 0 26px;display:grid;gap:14px}
.steps>li{counter-increment:s;position:relative;padding:0 0 0 48px}
.steps>li::before{content:counter(s);position:absolute;left:0;top:1px;width:32px;height:32px;border-radius:50%;display:grid;place-items:center;background:var(--blue-50);color:var(--blue-700);font:700 14px/1 var(--sans);border:1px solid var(--blue-100)}
.steps strong{color:var(--ink)}
.done{position:relative;padding:18px 20px 18px 56px;border-radius:var(--radius);background:var(--green-50);border:1px solid #A7F3D0;font-size:16px;line-height:1.6;max-width:none}
.done::before{content:"";position:absolute;left:20px;top:21px;width:22px;height:22px;border-radius:50%;background:var(--green) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12l5 5 9-10'/%3E%3C/svg%3E") center/14px no-repeat}
.done-k{display:block;font:700 12px/1.2 var(--sans);letter-spacing:.08em;text-transform:uppercase;color:var(--green);margin-bottom:4px}

/* agent + example drawers */
.assist{display:grid;gap:10px;margin-top:20px}
.assist details,.real-run{border:1px solid var(--line);border-radius:var(--radius);background:#fff;overflow:hidden}
.assist summary,.real-run summary{display:flex;align-items:center;gap:10px;padding:14px 18px;font:600 15px/1.4 var(--sans);color:var(--ink-2);list-style:none}
.assist summary::-webkit-details-marker,.real-run summary::-webkit-details-marker{display:none}
.assist summary::after,.real-run summary::after{content:"";margin-left:auto;width:10px;height:10px;border-right:2px solid var(--soft);border-bottom:2px solid var(--soft);transform:rotate(45deg) translateY(-3px);transition:transform .2s;flex:none}
details[open]>summary::after{transform:rotate(225deg) translateY(-2px)}
.assist summary:hover{background:var(--wash)}
.assist details>*:not(summary),.real-run>*:not(summary){margin-left:18px;margin-right:18px}
.assist details>:last-child,.real-run>:last-child{margin-bottom:18px}
.agent blockquote,.real-run blockquote{margin:4px 18px 12px;padding:14px 16px;background:var(--blue-50);border-left:3px solid var(--blue);border-radius:0 10px 10px 0;font-size:16px;line-height:1.6}
.example{background:var(--amber-50)!important;border-color:#FDE68A!important}
.example summary:hover{background:#FEF3C7}
.example p{font-size:16px;line-height:1.65}
.real-run{margin-top:14px}
.response{padding:4px 16px;border-left:3px solid var(--amber-300);background:#FFFDF5;border-radius:0 10px 10px 0}
.response p,.response li{font-size:15.5px}
.badge{display:inline-flex;align-items:center;height:22px;padding:0 9px;border-radius:999px;font:700 11px/1 var(--sans);letter-spacing:.06em;text-transform:uppercase;white-space:nowrap}
.badge-agent{background:var(--blue);color:#fff}
.badge-sim{background:var(--amber-300);color:#78350F}
.badge-real{background:var(--ink-2);color:#fff}
.copy{min-height:40px;padding:0 14px;margin:0 18px 6px;border:1px solid var(--blue);border-radius:8px;background:#fff;color:var(--blue-600);font:600 14px/1 var(--sans);cursor:pointer}
.copy:hover{background:var(--blue-50)}
.copy[hidden]{display:none}
.copy.ok{background:var(--green);border-color:var(--green);color:#fff}

/* tables */
.table-wrap{overflow-x:auto;margin:6px 0 24px;border:1px solid var(--line);border-radius:var(--radius)}
table{border-collapse:collapse;width:100%;font:15px/1.5 var(--sans)}
caption{text-align:left;padding:14px 16px 4px;font:600 14px/1.4 var(--sans);color:var(--muted)}
th,td{text-align:left;vertical-align:top;padding:12px 16px;border-bottom:1px solid var(--line)}
tbody tr:last-child td{border-bottom:0}
th{font-weight:600;color:var(--ink-2);background:var(--wash)}
td:first-child{font-weight:600;color:var(--ink-2)}

/* cards, paths, splits */
.card{border:1px solid var(--line);border-radius:var(--radius);padding:20px 22px;background:#fff;margin:0 0 20px}
.card p:last-child,.card ul:last-child,.card ol:last-child{margin-bottom:0}
.card-muted{background:var(--wash)}
.card-rules{background:var(--blue-50);border-color:var(--blue-100)}
.split{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px;margin:0 0 22px}
.split .card{margin:0}
.paths{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px;margin:6px 0 24px}
.path{display:flex;flex-direction:column;gap:6px;padding:18px 20px;border-radius:var(--radius);border:1px solid var(--line);text-decoration:none;color:var(--ink);background:#fff;transition:border-color .15s,box-shadow .15s,transform .15s}
.path:hover{border-color:var(--blue);box-shadow:0 8px 24px rgba(59,130,246,.12);transform:translateY(-1px);color:var(--ink)}
.path-k{font:700 11px/1 var(--sans);letter-spacing:.08em;text-transform:uppercase;color:var(--blue)}
.path strong{font:600 17px/1.35 var(--sans)}
.path span:last-child{font-size:14px;color:var(--muted)}
.compact{padding-left:1.2em;margin:0 0 14px}.compact li{margin:0 0 6px}
.ticks,.crosses{list-style:none;padding:0;margin:0}
.ticks li,.crosses li{position:relative;padding-left:28px;margin:0 0 6px}
.ticks li::before{content:"✓";position:absolute;left:0;color:var(--green);font-weight:700}
.crosses li::before{content:"–";position:absolute;left:4px;color:var(--soft);font-weight:700}

/* timeline */
.timeline{list-style:none;padding:0;margin:8px 0 26px;position:relative}
.timeline::before{content:"";position:absolute;left:7px;top:8px;bottom:8px;width:2px;background:linear-gradient(180deg,var(--blue),var(--amber))}
.timeline li{position:relative;display:grid;grid-template-columns:118px 1fr;gap:14px;padding:0 0 18px 32px}
.timeline li::before{content:"";position:absolute;left:0;top:6px;width:16px;height:16px;border-radius:50%;background:#fff;border:3px solid var(--blue)}
.timeline li:last-child::before{border-color:var(--amber)}
.t-when{font:700 14px/1.6 var(--sans);color:var(--blue-700);white-space:nowrap}
.timeline-90 li{grid-template-columns:118px 1fr}

/* flow */
.flow{list-style:none;padding:0;margin:8px 0 24px;display:grid;grid-template-columns:repeat(5,1fr);gap:10px}
.flow li{position:relative;padding:16px 14px;border-radius:12px;background:var(--wash);font-size:14.5px;line-height:1.45;border-top:3px solid var(--blue)}
.flow li:nth-child(4),.flow li:nth-child(5){border-top-color:var(--amber)}
.flow b{display:block;font:400 22px/1 var(--display);color:var(--blue);margin-bottom:8px}
.flow strong{display:block}

/* Prairie Line intro */
.pl-intro{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(240px,1fr);gap:24px;align-items:start}
.legend{border-radius:var(--radius);padding:18px 20px;background:var(--amber-50);border:1px solid #FDE68A;position:static;max-height:none;overflow:visible}
.legend p{font-size:14.5px;line-height:1.6;margin:0 0 12px}.legend p:last-child{margin:0}
.legend .badge{margin-right:6px}
.journey{list-style:none;padding:0;margin:10px 0 0;display:flex;flex-wrap:wrap;gap:8px}
.journey li{padding:10px 14px;border-radius:12px;background:#fff;border:1px dashed #FBBF24;font-size:14.5px;line-height:1.3}
.journey b{display:block;font:700 11px/1 var(--sans);letter-spacing:.06em;text-transform:uppercase;color:var(--amber-700);margin-bottom:4px}

/* funnel */
.funnel{margin:6px 0 26px;padding:20px;border:1px solid var(--line);border-radius:var(--radius)}
.funnel figcaption{font:600 14px/1.4 var(--sans);color:var(--muted);margin-bottom:14px}
.funnel ol{list-style:none;padding:0;margin:0 0 12px;display:grid;gap:8px}
.funnel li{width:var(--w);min-width:210px;padding:12px 16px;border-radius:10px;background:linear-gradient(90deg,var(--blue),#60A5FA);color:#fff;font-size:15px}
.funnel li strong{font:400 22px/1 var(--display);margin-right:6px}
.funnel li span{opacity:.85;font-size:13.5px;margin-left:6px}
.funnel li.total{background:linear-gradient(90deg,var(--amber),var(--amber-300));color:#422006}

/* templates */
.tpls{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:14px;margin:0 0 24px}
.tpl{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column}
.tpl-head{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:12px 14px;background:var(--wash);border-bottom:1px solid var(--line)}
.tpl-head h3{margin:0;font-size:15.5px}
.tpl-head .copy{margin:0;min-height:34px}
.tpl pre{margin:0;padding:14px;font:13.5px/1.6 ui-monospace,SFMono-Regular,Menlo,monospace;white-space:pre-wrap;overflow-wrap:anywhere;color:var(--ink-2);flex:1}
.downloads{padding:20px 22px;border-radius:var(--radius);background:var(--blue-50);border:1px solid var(--blue-100);margin:0 0 24px}
.downloads ul{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:8px}
.downloads a{display:flex;justify-content:space-between;gap:10px;padding:10px 14px;border-radius:10px;background:#fff;border:1px solid var(--blue-100);text-decoration:none;font-weight:500}
.downloads a span{font:700 11px/1.8 var(--sans);color:var(--soft)}

/* chapter 24 */
.counting{margin:0 0 24px}
.not-list{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:8px}
.not-list li{padding:10px 14px;border-radius:10px;background:var(--wash);font-size:15px;color:var(--soft)}
.not-list span{color:var(--ink);font-weight:600}
.not-list span:last-child{color:var(--blue-700)}
.weekly{margin:0 0 24px}.weekly ol{padding-left:1.3em}.weekly li{margin:0 0 6px}

.sources{list-style:none;padding:0}.sources li{margin:0 0 10px}.sources b{color:var(--blue-700);margin-right:4px}

/* author */
.author{margin:48px 0 0;padding:clamp(28px,4vw,48px);border:0;border-radius:24px;background:radial-gradient(70% 90% at 0% 0%,#E0E7FF 0,transparent 60%),radial-gradient(60% 80% at 100% 100%,#FDE7D5 0,transparent 60%),#FAFAFF}
.author h2{font-size:clamp(30px,3.4vw,44px)}
.author .hero-cta{margin:20px 0 0}
footer{padding:32px 0 64px;font-size:13.5px;line-height:1.7;color:var(--soft)}
footer p{margin:0 0 6px}

/* responsive */
@media (min-width:1021px){aside details>summary{pointer-events:none}}
@media (max-width:1020px){
  :root{--top:60px}
  .top-title{display:none}
  .layout{display:block}
  aside{position:relative;top:0;max-height:none;border-right:0;border-bottom:1px solid var(--line);padding:12px 20px;background:#fff}
  #reading-position{display:none}
  aside summary{display:flex;align-items:center;justify-content:space-between;min-height:44px}
  aside summary span{display:inline;margin:0 0 0 10px}
  aside summary::after{content:"";width:9px;height:9px;border-right:2px solid var(--soft);border-bottom:2px solid var(--soft);transform:rotate(45deg);margin-left:auto}
  aside details[open] summary::after{transform:rotate(225deg)}
  nav{max-height:60vh;overflow:auto;margin-top:6px}
  nav a{min-height:44px;align-items:center}
  .flow{grid-template-columns:1fr 1fr}
  .pl-intro{grid-template-columns:1fr}
}
@media (max-width:640px){
  body{font-size:16.5px}
  .top{gap:10px;padding:0 16px}
  .brand{font-size:19px}
  .top-actions .btn{min-height:38px;padding:0 12px;font-size:13.5px}
  #print{display:none}
  main{padding:0 16px}
  .hero,.part{margin:0 -16px;padding-left:16px;padding-right:16px}
  .hero{padding-top:40px}
  h1{font-size:40px}
  .hero-cta .btn{width:100%}
  .ch-head{grid-template-columns:1fr;gap:4px}
  .ch-num{font-size:40px}
  .steps>li{padding-left:42px}
  .timeline li{grid-template-columns:1fr;gap:2px}
  .flow{grid-template-columns:1fr}
  .done{padding:16px 16px 16px 50px}
  .done::before{left:16px}
  .assist details>*:not(summary),.real-run>*:not(summary){margin-left:14px;margin-right:14px}
  .agent blockquote,.real-run blockquote{margin-left:14px;margin-right:14px}
  .copy{margin-left:14px}
  .funnel li{min-width:0;width:100%!important}
  th,td{padding:10px 12px;font-size:14px}
  .author{border-radius:18px;margin-left:-4px;margin-right:-4px}
}

/* print */
@media print{
  .top,aside,.skip,.progress,.hero-cta,.back,.copy,.author .hero-cta{display:none!important}
  .layout{display:block}main{padding:0}
  body{font-size:11pt;line-height:1.5}
  .hero,.part{margin:0;padding:0 0 16pt;background:none}
  h1{font-size:30pt}.grad,.ch-num{-webkit-text-fill-color:initial;color:var(--blue);background:none}
  section{break-before:page;border:0;padding:0}
  .assist details{break-inside:avoid}
  .done,.card,.tpl,table{break-inside:avoid}
}
.path-wb{background:linear-gradient(135deg,var(--blue-50),var(--amber-50));border-color:var(--blue-100)}
@media (max-width:640px){.top-actions a.btn-ghost[href="workbook.html"]{display:none}}