/* RefAlder — hand-written CSS, no frameworks. */
:root{
  --bg:#f7f8fb; --bg-2:#ffffff; --surface:#ffffff; --surface-2:#f0f2f8;
  --text:#12151f; --muted:#4b5468; --line:#e2e6f0;
  --accent:#4f46e5; --accent-2:#0891b2; --accent-ink:#ffffff;
  --ok:#0f766e; --warn:#b45309; --bad:#b91c1c;
  --grad:linear-gradient(135deg,#4f46e5 0%,#0891b2 100%);
  --shadow:0 1px 2px rgba(16,24,40,.06),0 12px 32px -12px rgba(16,24,40,.18);
  --radius:16px; --max:1120px; --read:72ch;
  --font:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
  color-scheme:light;
}
:root[data-theme="dark"]{
  --bg:#0a0c14; --bg-2:#0f1220; --surface:#131730; --surface-2:#1a1f3d;
  --text:#eef1fb; --muted:#a4adc7; --line:#262c4d;
  --accent:#8b8cff; --accent-2:#22d3ee; --accent-ink:#0a0c14;
  --ok:#2dd4bf; --warn:#fbbf24; --bad:#f87171;
  --grad:linear-gradient(135deg,#8b8cff 0%,#22d3ee 100%);
  --shadow:0 1px 2px rgba(0,0,0,.4),0 18px 40px -16px rgba(0,0,0,.7);
  color-scheme:dark;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font);font-size:1.0625rem;line-height:1.65;-webkit-font-smoothing:antialiased}
img,svg{max-width:100%;display:block}
a{color:var(--accent);text-underline-offset:3px}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:3px solid var(--accent-2);outline-offset:3px;border-radius:6px}
.skip{position:absolute;left:-999px;top:8px;background:var(--accent);color:var(--accent-ink);padding:.6rem 1rem;border-radius:8px;z-index:100}
.skip:focus{left:8px}
.wrap{width:min(100% - 2.5rem,var(--max));margin-inline:auto}
h1,h2,h3{line-height:1.15;letter-spacing:-.025em;margin:0 0 .6em;text-wrap:balance}
h1{font-size:clamp(2.1rem,5.4vw,3.6rem);font-weight:800}
h2{font-size:clamp(1.5rem,3.2vw,2.15rem);font-weight:750;margin-top:0}
h3{font-size:1.2rem;font-weight:700;letter-spacing:-.015em}
p{margin:0 0 1em}
.lead{font-size:clamp(1.1rem,2vw,1.3rem);color:var(--muted);max-width:60ch}
.muted{color:var(--muted)}
.eyebrow{display:inline-flex;gap:.5rem;align-items:center;font-size:.8rem;font-weight:700;letter-spacing:.09em;text-transform:uppercase;color:var(--accent);margin-bottom:1rem}
.eyebrow::before{content:"";width:22px;height:2px;background:var(--grad);border-radius:2px}

/* Setup banner (only visible while placeholders are in use) */
.setup-banner{background:#fef3c7;color:#78350f;font-size:.9rem;padding:.55rem 1rem;text-align:center;border-bottom:1px solid #fcd34d}
.setup-banner code{background:rgba(0,0,0,.08);padding:.1em .4em;border-radius:4px}

/* Disclosure strip */
.disclose-bar{background:var(--surface-2);border-bottom:1px solid var(--line);font-size:.85rem;color:var(--muted);padding:.5rem 0}
.disclose-bar .wrap{display:flex;gap:.5rem 1rem;flex-wrap:wrap;align-items:center;justify-content:center;text-align:center}
.disclose-bar a{font-weight:600}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--bg) 85%,transparent);backdrop-filter:saturate(1.4) blur(14px);-webkit-backdrop-filter:saturate(1.4) blur(14px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;gap:1rem;min-height:64px}
.brand{display:flex;align-items:center;gap:.6rem;font-weight:800;letter-spacing:-.02em;color:var(--text);text-decoration:none;font-size:1.1rem}
.brand svg{width:30px;height:30px}
.nav-links{display:flex;align-items:center;gap:.25rem;list-style:none;margin:0;padding:0}
.nav-links a{display:block;padding:.5rem .8rem;border-radius:10px;color:var(--muted);text-decoration:none;font-weight:600;font-size:.95rem}
.nav-links a:hover,.nav-links a[aria-current="page"]{color:var(--text);background:var(--surface-2)}
.nav-tools{display:flex;gap:.5rem;align-items:center}
.icon-btn{appearance:none;border:1px solid var(--line);background:var(--surface);color:var(--text);width:42px;height:42px;border-radius:12px;display:inline-grid;place-items:center;cursor:pointer}
.icon-btn:hover{background:var(--surface-2)}
.icon-btn svg{width:20px;height:20px}
.menu-btn{display:none}
.sun{display:none}
:root[data-theme="dark"] .sun{display:block}
:root[data-theme="dark"] .moon{display:none}
@media (max-width:860px){
  .menu-btn{display:inline-grid}
  .nav-links{position:absolute;left:0;right:0;top:100%;flex-direction:column;align-items:stretch;background:var(--bg-2);border-bottom:1px solid var(--line);padding:.75rem 1.25rem 1rem;display:none}
  .nav-links.open{display:flex}
  .nav-links a{padding:.75rem .8rem}
  .nav{position:relative}
}

/* Buttons */
.btn{appearance:none;display:inline-flex;align-items:center;justify-content:center;gap:.55rem;border:1px solid transparent;border-radius:14px;padding:.9rem 1.4rem;font:inherit;font-weight:700;text-decoration:none;cursor:pointer;line-height:1.1;min-height:48px;transition:transform .15s ease,box-shadow .15s ease,background .15s}
.btn-primary{background:var(--grad);color:var(--accent-ink);box-shadow:0 10px 26px -10px var(--accent)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 14px 30px -10px var(--accent)}
:root:not([data-theme="dark"]) .btn-primary{color:#fff}
.btn-ghost{background:var(--surface);border-color:var(--line);color:var(--text)}
.btn-ghost:hover{background:var(--surface-2)}
.btn svg{width:18px;height:18px}

/* Hero */
.hero{position:relative;padding:clamp(2.5rem,7vw,5.5rem) 0 clamp(2rem,5vw,4rem);overflow:hidden}
.hero::before{content:"";position:absolute;inset:-20% -10% auto -10%;height:120%;background:radial-gradient(60% 50% at 20% 0%,color-mix(in srgb,var(--accent) 22%,transparent),transparent 70%),radial-gradient(50% 45% at 90% 10%,color-mix(in srgb,var(--accent-2) 20%,transparent),transparent 70%);pointer-events:none;z-index:0}
.hero .wrap{position:relative;z-index:1;display:grid;gap:2.5rem;grid-template-columns:1.15fr .85fr;align-items:center}
@media (max-width:900px){.hero .wrap{grid-template-columns:1fr}}
.hero h1 .grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-meta{display:flex;gap:.5rem 1.25rem;flex-wrap:wrap;color:var(--muted);font-size:.9rem;margin-top:1.25rem}
.hero-meta span{display:inline-flex;align-items:center;gap:.4rem}
.dot{width:8px;height:8px;border-radius:50%;background:var(--ok);display:inline-block}

/* Code card */
.code-card{background:var(--surface);border:1px solid var(--line);border-radius:22px;padding:1.5rem;box-shadow:var(--shadow);position:relative}
.code-card .label{font-size:.8rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-bottom:.6rem}
.code-row{display:flex;gap:.6rem;align-items:stretch;flex-wrap:wrap}
.code-box{flex:1 1 200px;min-width:0;font-family:var(--mono);font-size:clamp(1.25rem,3.6vw,1.7rem);font-weight:700;letter-spacing:.02em;background:var(--surface-2);border:1.5px dashed color-mix(in srgb,var(--accent) 55%,var(--line));border-radius:14px;padding:.75rem 1rem;overflow-wrap:anywhere;display:flex;align-items:center}
.copy-status{min-height:1.4em;font-size:.9rem;color:var(--ok);margin:.6rem 0 0;font-weight:600}
.code-card .btn-primary{width:100%;margin-top:.9rem}
.cta-note{font-size:.82rem;color:var(--muted);margin:.75rem 0 0;line-height:1.5}
.cta-note a{font-weight:600}
.mini-list{list-style:none;margin:1.1rem 0 0;padding:1rem 0 0;border-top:1px solid var(--line);display:grid;gap:.5rem;font-size:.92rem;color:var(--muted)}
.mini-list li{display:flex;gap:.6rem}
.mini-list svg{flex:0 0 18px;width:18px;height:18px;margin-top:.2rem;color:var(--ok)}

/* Sections */
section{padding:clamp(2.5rem,6vw,4.5rem) 0}
.section-alt{background:var(--bg-2);border-block:1px solid var(--line)}
.section-head{max-width:64ch;margin-bottom:2rem}
.grid{display:grid;gap:1.1rem}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
@media (max-width:900px){.grid-3{grid-template-columns:1fr}.grid-2{grid-template-columns:1fr}}
@media (min-width:601px) and (max-width:900px){.grid-3{grid-template-columns:repeat(2,1fr)}}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:1.4rem}
.card h3{margin-bottom:.4em}
.card p:last-child{margin-bottom:0}
.card .num{width:36px;height:36px;border-radius:11px;background:var(--grad);color:#fff;display:grid;place-items:center;font-weight:800;margin-bottom:.9rem}
:root[data-theme="dark"] .card .num{color:var(--accent-ink)}
.source{font-size:.82rem;color:var(--muted);margin-top:.9rem}
.stat{font-size:2.2rem;font-weight:800;letter-spacing:-.03em;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;line-height:1.1}

/* Steps */
.steps{counter-reset:s;list-style:none;padding:0;margin:0;display:grid;gap:1rem}
.steps>li{counter-increment:s;position:relative;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:1.2rem 1.3rem 1.2rem 4.4rem}
.steps>li::before{content:counter(s);position:absolute;left:1.2rem;top:1.15rem;width:36px;height:36px;border-radius:11px;background:var(--grad);color:#fff;display:grid;place-items:center;font-weight:800}
:root[data-theme="dark"] .steps>li::before{color:var(--accent-ink)}
.steps h3{margin:0 0 .25em}
.steps p{margin:0;color:var(--muted)}

/* Tables */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}
table{width:100%;border-collapse:collapse;font-size:.97rem;min-width:520px}
th,td{text-align:left;padding:.85rem 1rem;border-bottom:1px solid var(--line);vertical-align:top}
th{font-size:.8rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);background:var(--surface-2)}
tr:last-child td{border-bottom:0}
caption{caption-side:bottom;text-align:left;padding:.75rem 1rem;font-size:.85rem;color:var(--muted)}

/* Pros / cons */
.pc{display:grid;gap:1.1rem;grid-template-columns:1fr 1fr}
@media (max-width:800px){.pc{grid-template-columns:1fr}}
.pc ul{list-style:none;margin:0;padding:0;display:grid;gap:.7rem}
.pc li{display:flex;gap:.65rem}
.pc li::before{flex:0 0 22px;height:22px;border-radius:50%;display:grid;place-items:center;font-size:.8rem;font-weight:800;margin-top:.15rem}
.pros li::before{content:"✓";background:color-mix(in srgb,var(--ok) 18%,transparent);color:var(--ok)}
.cons li::before{content:"!";background:color-mix(in srgb,var(--warn) 20%,transparent);color:var(--warn)}

/* Callouts */
.callout{border:1px solid var(--line);border-left:4px solid var(--accent);background:var(--surface);border-radius:12px;padding:1rem 1.2rem;margin:1.5rem 0}
.callout.risk{border-left-color:var(--warn);background:color-mix(in srgb,var(--warn) 7%,var(--surface))}
.callout.ok{border-left-color:var(--ok)}
.callout strong:first-child{display:block;margin-bottom:.2rem}
.callout p:last-child{margin-bottom:0}

/* FAQ */
.faq{display:grid;gap:.75rem;max-width:860px}
.faq details{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:0}
.faq summary{cursor:pointer;list-style:none;padding:1.05rem 3rem 1.05rem 1.25rem;font-weight:700;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:1.25rem;top:50%;transform:translateY(-50%);font-size:1.4rem;color:var(--accent);transition:transform .2s}
.faq details[open] summary::after{content:"–"}
.faq .ans{padding:0 1.25rem 1.1rem;color:var(--muted)}
.faq .ans p:last-child{margin-bottom:0}

/* Article pages */
.page-hero{padding:clamp(2rem,5vw,3.5rem) 0 1rem;border-bottom:1px solid var(--line);background:linear-gradient(180deg,color-mix(in srgb,var(--accent) 7%,transparent),transparent)}
.crumbs{font-size:.88rem;color:var(--muted);margin-bottom:1rem}
.crumbs a{color:var(--muted)}
.article{display:grid;grid-template-columns:minmax(0,var(--read)) 300px;gap:3rem;padding:2.5rem 0 4rem;align-items:start}
@media (max-width:1020px){.article{grid-template-columns:minmax(0,1fr)}}
.prose{min-width:0}
.prose h2{margin-top:2.2em;scroll-margin-top:90px}
.prose h3{margin-top:1.6em}
.prose ul,.prose ol{padding-left:1.3rem;margin:0 0 1.2em}
.prose li{margin-bottom:.4em}
.prose .table-wrap{margin:1.2rem 0 1.6rem}
.toc{position:sticky;top:90px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:1.1rem 1.2rem}
.toc h2{font-size:.8rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin:0 0 .6rem}
.toc ol{list-style:none;padding:0;margin:0;display:grid;gap:.35rem;font-size:.92rem}
.toc a{color:var(--text);text-decoration:none}
.toc a:hover{color:var(--accent);text-decoration:underline}
.toc .side-cta{margin-top:1rem;padding-top:1rem;border-top:1px solid var(--line)}
.toc .side-cta .btn{width:100%;padding:.75rem 1rem}
.meta-line{display:flex;flex-wrap:wrap;gap:.4rem 1.2rem;color:var(--muted);font-size:.9rem;margin-top:.8rem}
.inline-cta{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:1.3rem;margin:2rem 0;display:grid;gap:.75rem}
.inline-cta p{margin:0}
.inline-cta .row{display:flex;gap:.7rem;flex-wrap:wrap;align-items:center}
.inline-cta code,.prose code,.card code{font-family:var(--mono);background:var(--surface-2);padding:.15em .45em;border-radius:6px;font-size:.92em}
.related{display:grid;gap:1rem;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));margin-top:1rem}
.related a{display:block;text-decoration:none;color:var(--text);background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:1rem 1.1rem;font-weight:700}
.related a span{display:block;font-weight:500;color:var(--muted);font-size:.9rem;margin-top:.25rem}
.related a:hover{border-color:var(--accent)}

/* Footer */
.site-footer{border-top:1px solid var(--line);background:var(--bg-2);padding:3rem 0 2rem;font-size:.95rem;color:var(--muted)}
.foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:2rem}
@media (max-width:800px){.foot-grid{grid-template-columns:1fr}}
.site-footer h2{font-size:.8rem;letter-spacing:.08em;text-transform:uppercase;color:var(--text);margin-bottom:.8rem}
.site-footer ul{list-style:none;padding:0;margin:0;display:grid;gap:.45rem}
.site-footer a{color:var(--muted)}
.site-footer a:hover{color:var(--text)}
.fine{margin-top:2rem;padding-top:1.5rem;border-top:1px solid var(--line);font-size:.85rem;line-height:1.6}
.fine p{margin-bottom:.7em}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
@media print{.site-header,.disclose-bar,.toc,.site-footer .foot-grid{display:none}}
.hub-note{margin:.6rem 0 0;font-size:1rem;color:var(--muted);max-width:60ch}
.hub-note a{font-weight:700}
.pillar-cta-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:1.4rem;margin:1.6rem 0}
.hub-card{display:block;background:var(--surface);border:1px solid var(--accent);border-radius:var(--radius);padding:1.4rem 1.6rem;text-decoration:none;color:var(--text);box-shadow:var(--shadow)}
.hub-card:hover{border-color:var(--accent-2)}
.hub-card strong{display:block;font-size:1.25rem;letter-spacing:-.01em;margin-bottom:.3rem}
.hub-card span{color:var(--muted)}