:root{
  --bg:#F3F2F2; --surface:#FFFFFF; --ink:#201E1D; --muted:#6E6A67; --line:#DCDAD9;
  --accent:#201E1D; --accent-2:#EC3013; --accent-ink:#fff; --gold:#EC3013;
  --green:#FFFFFF; --green-ink:#201E1D; --yellow:#DCDAD9; --yellow-ink:#201E1D;
  --blue:#FDE7E3; --blue-ink:#201E1D; --red:#FDE7E3; --red-ink:#EC3013;
  --radius:0; --shadow:none;
  --maxw:1080px;
}
[data-theme="dark"]{
  --bg:#0e1320; --surface:#161d2e; --ink:#e7eaf3; --muted:#9aa3ba; --line:#27314a;
  --accent:#5b8ac9; --accent-2:#d4a850; --accent-ink:#0e1320; --gold:#d4a850;
  --green:#16331f; --green-ink:#7fe0a0; --yellow:#37300f; --yellow-ink:#f2cf6b;
  --blue:#15243f; --blue-ink:#8fb4ff; --red:#3a1a18; --red-ink:#ff9b94;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 10px 30px rgba(0,0,0,.4);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:78px}
body{margin:0;font-family:Archivo,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--ink);line-height:1.55;-webkit-font-smoothing:antialiased}
h1,h2,h3{line-height:1.2;margin:0 0 .4em}
a{color:#B8250D} a:hover{text-decoration:underline}
.skip{position:absolute;left:-999px;top:0;background:var(--accent);color:#fff;padding:.5rem 1rem;border-radius:0;z-index:100}
.skip:focus{left:8px;top:8px}
.muted{color:var(--muted)} .small{font-size:.85rem} .center{text-align:center} .tight li{margin:.2rem 0}
.hl{background:#FDE7E3;padding:0 .05em}

.topbar{position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:1rem;padding:.6rem 1.2rem;background:var(--surface);border-bottom:2px solid var(--ink)}
.brand{display:flex;align-items:center;gap:.6rem}
.brand .logo{font-size:1.5rem}
.brand strong{display:block;line-height:1.1}
.brand-sub{color:var(--muted);font-size:.78rem}
.topnav{display:flex;gap:.15rem;margin-left:auto;flex-wrap:wrap}
.topnav a{padding:.35rem .55rem;border-radius:0;color:var(--muted);font-size:.82rem;font-weight:500}
.topnav a:hover{background:var(--bg);color:var(--ink);text-decoration:none}
.topnav a.active{color:var(--ink);background:var(--red)}
.topbar-actions{display:flex;align-items:center;gap:.6rem}
.icon-btn{background:var(--bg);border:2px solid var(--ink);border-radius:0;padding:.35rem .5rem;cursor:pointer;font-size:1rem}
.progress-mini{position:relative;width:38px;height:38px;display:grid;place-items:center;font-size:.62rem;font-weight:700;color:var(--ink)}
.ring{position:absolute;inset:0;width:38px;height:38px;transform:rotate(-90deg)}
.ring-bg{fill:none;stroke:var(--line);stroke-width:3}
.ring-fill{fill:none;stroke:var(--accent-2);stroke-width:3;stroke-linecap:round;stroke-dasharray:100 100;stroke-dashoffset:100;transition:stroke-dashoffset .5s}

.hero{padding:4rem 1.2rem 2rem;max-width:var(--maxw);margin:0 auto}
.eyebrow{text-transform:uppercase;letter-spacing:.12em;font-size:.72rem;font-weight:700;color:var(--ink)}
.hero h1{font-size:clamp(2rem,5vw,3.2rem);font-weight:700;letter-spacing:-.03em;border-left:9px solid var(--accent-2);padding-left:.4em}
.lede{font-size:1.1rem;color:var(--muted);max-width:62ch}
.mindset{display:grid;grid-template-columns:1fr 1fr;gap:.6rem;margin:1.5rem 0;max-width:760px}
.mindset .ms{display:flex;align-items:center;gap:.6rem;padding:.6rem .8rem;border-radius:0;font-size:.9rem}
.mindset .from{background:var(--red);color:var(--red-ink)}
.mindset .to{background:var(--green);color:var(--green-ink)}
.ask-card{margin:1.4rem 0;padding:1.1rem 1.3rem;background:var(--surface);border:2px solid var(--ink);border-left:4px solid var(--accent-2);border-radius:0;box-shadow:none}
.ask-q{display:block;color:var(--muted);font-size:.85rem;margin-bottom:.3rem}
.ask-card strong{font-size:1.1rem}
.hero-cta{display:flex;gap:.8rem;flex-wrap:wrap;margin-top:1rem}
.btn{display:inline-flex;align-items:center;gap:.4rem;padding:.7rem 1.2rem;border-radius:0;font-weight:600;font-size:.95rem;cursor:pointer;border:1px solid transparent;transition:transform .08s;font-family:inherit}
.btn:active{transform:translateY(1px)} .btn.sm{padding:.4rem .7rem;font-size:.82rem}
.btn.primary{background:var(--accent-2);color:#fff}.btn.primary:hover{background:#C8280F}
.btn.ghost{background:var(--surface);border-color:var(--line);color:var(--ink)}
.btn.warn{background:transparent;border-color:var(--red);color:var(--red-ink)}

.band{max-width:var(--maxw);margin:0 auto;padding:2.6rem 1.2rem}
.band.alt{background:var(--surface);max-width:none;border-block:1px solid var(--line)}
.band.alt>*{max-width:var(--maxw);margin-inline:auto}
.section-head{margin-bottom:1.3rem}
.section-head h2{font-size:1.55rem;font-weight:700}
.badge{display:inline-block;font-size:.74rem;font-weight:700;letter-spacing:.03em;color:var(--ink);background:var(--red);padding:.25rem .6rem;border-radius:0;margin-bottom:.5rem}

.tracker{list-style:none;counter-reset:s;padding:0;margin:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:.7rem}
.tracker li{counter-increment:s;position:relative;background:var(--surface);border:2px solid var(--ink);border-radius:0;padding:.8rem .9rem .8rem 2.7rem;cursor:pointer;font-size:.9rem;font-weight:500;box-shadow:none}
.tracker li small{display:block;color:var(--muted);font-weight:400;font-size:.78rem}
.tracker li::before{content:counter(s);position:absolute;left:.7rem;top:.8rem;width:1.6rem;height:1.6rem;border-radius:0;background:var(--bg);border:2px solid var(--ink);display:grid;place-items:center;font-size:.8rem;font-weight:700;color:var(--muted)}
.tracker li.done::before{content:"✓";background:var(--ink);color:#fff;border-color:var(--ink)}
.tracker li:hover{border-color:var(--ink)}

.card{background:var(--surface);border:2px solid var(--ink);border-radius:0;padding:1.2rem;box-shadow:none}
.card h3{font-size:1.05rem}
.res-grid{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
@media(max-width:820px){.res-grid{grid-template-columns:1fr}}

.picker{display:grid;gap:.55rem;max-width:680px;margin-bottom:1.2rem}
.picker label{font-weight:600;font-size:.92rem}
.picker select,.search,.builder-grid input,.builder-grid textarea{width:100%;padding:.6rem .7rem;border:2px solid var(--ink);border-radius:0;background:var(--bg);color:var(--ink);font:inherit}
.picker-out{padding:1rem}
select:focus,input:focus,textarea:focus{outline:2px solid var(--accent-2);outline-offset:1px}

.tech-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1rem}
.tech{background:var(--surface);border:2px solid var(--ink);border-radius:0;padding:1.1rem;box-shadow:none;display:flex;flex-direction:column}
.tech .ti{font-size:1.5rem}
.tech h3{margin:.4rem 0 .1rem;font-size:1.08rem}
.tech .sub{color:var(--ink);font-size:.8rem;font-weight:600;margin-bottom:.4rem}
.tech p{font-size:.9rem;margin:.2rem 0}
.tech .ex{margin-top:.6rem;background:var(--bg);border:1px dashed var(--line);border-radius:0;padding:.5rem .6rem;font-size:.82rem;font-family:ui-monospace,monospace}
.tech .try{margin-top:auto;padding-top:.7rem}
.tech .try label{display:flex;gap:.45rem;align-items:flex-start;font-size:.83rem;color:var(--muted);cursor:pointer}

.feat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:.7rem}
.feat{background:var(--surface);border:2px solid var(--ink);border-radius:0;padding:.8rem .9rem;box-shadow:none}
.feat b{display:block;font-size:.95rem}
.feat span{font-size:.82rem;color:var(--muted)}
.feat .pill{font-size:.66rem;font-weight:700;text-transform:uppercase;letter-spacing:.04em;color:var(--ink);background:var(--red);padding:.05rem .4rem;border-radius:0;margin-left:.3rem}

.model-table,.pg-table,.cheat-table{width:100%;border-collapse:collapse;font-size:.88rem;margin:.4rem 0}
.model-table th,.model-table td,.pg-table th,.pg-table td,.cheat-table th,.cheat-table td{border:2px solid var(--ink);padding:.55rem .6rem;text-align:left;vertical-align:top}
.model-table th,.pg-table th,.cheat-table th{background:var(--bg)}
.model-table tr.hit td{background:var(--red)}
.clear-card{margin-top:1rem}
.clear-row{display:grid;grid-template-columns:90px 1fr;gap:.6rem;padding:.4rem 0;border-bottom:1px solid var(--line);font-size:.88rem}
.clear-row b{color:var(--ink)}

.nb-out,.ws-row{font-size:.86rem}
.nb-out span{display:inline-block;background:var(--bg);border:2px solid var(--ink);border-radius:0;padding:.2rem .55rem;margin:.2rem .2rem 0 0;font-size:.8rem}
.ws-row{display:grid;grid-template-columns:80px 1fr;gap:.5rem;padding:.45rem 0;border-bottom:1px solid var(--line)}
.ws-row b{color:var(--ink)}

.builder{margin-bottom:1rem}
.builder .help{color:var(--muted);font-size:.85rem;margin:.2rem 0 .8rem}
.builder-grid{display:grid;grid-template-columns:1fr 1fr;gap:.8rem}
@media(max-width:680px){.builder-grid{grid-template-columns:1fr}}
.builder-grid .bf label{display:block;font-weight:600;font-size:.85rem;margin-bottom:.25rem}
.builder-grid textarea{min-height:58px;resize:vertical}
.builder-out{margin-top:1rem}
.bo-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:.4rem}
.builder-out pre{background:var(--bg);border:2px solid var(--ink);border-radius:0;padding:.9rem;font-size:.82rem;white-space:pre-wrap;overflow:auto;max-height:340px;font-family:ui-monospace,monospace}

.mistakes{margin-top:1.2rem;border:2px solid var(--ink);border-radius:0;background:var(--surface)}
.mistakes summary{cursor:pointer;padding:.7rem .9rem;font-weight:600;font-size:.92rem}
.mistakes>div{padding:0 .9rem .8rem}

.tryit{margin-top:1.2rem;padding:.9rem 1.1rem;border-radius:0;background:var(--blue);color:var(--blue-ink)}
.tryit b{display:block;margin-bottom:.3rem}
.tryit label{display:flex;gap:.5rem;align-items:flex-start;font-size:.9rem;cursor:pointer}

.callout{margin:1rem 0;padding:.85rem 1rem;border-radius:0;font-size:.9rem}
.callout.good{background:var(--green);color:var(--green-ink)}

.glossary{max-height:340px;overflow:auto;margin:.6rem 0 0}
.glossary dt{font-weight:700;font-size:.9rem;margin-top:.6rem}
.glossary dd{margin:0;color:var(--muted);font-size:.86rem}

.q{background:var(--surface);border:2px solid var(--ink);border-radius:0;padding:1rem 1.1rem;margin-bottom:.8rem;box-shadow:none}
.q .qq{font-weight:600;margin-bottom:.5rem}
.q .opt{display:block;width:100%;text-align:left;border:2px solid var(--ink);background:var(--bg);border-radius:0;padding:.5rem .7rem;margin:.3rem 0;cursor:pointer;font:inherit;font-size:.9rem}
.q .opt:hover{border-color:var(--ink)}
.q .opt.correct{background:var(--green);color:var(--green-ink);border-color:transparent}
.q .opt.wrong{background:var(--red);color:var(--red-ink);border-color:transparent}
.q .explain{font-size:.85rem;color:var(--muted);margin-top:.5rem;display:none}
.q.answered .explain{display:block}
.quiz-score{font-weight:700;font-size:1.05rem;text-align:center;margin-top:.6rem;color:var(--ink)}

.foot{max-width:var(--maxw);margin:2rem auto;padding:1.4rem 1.2rem;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;color:var(--muted);font-size:.82rem}

@media print{.topbar,.hero-cta,.tracker,#themeToggle,.skip{display:none!important}body{background:#fff}.card,.tech{box-shadow:none}}