/* ===========================================================================
   Agent Engineering — shared theme
   Courier-forward: typewriter chrome, readable prose, terminal affordances.
   Used by both the free course (static) and The Next Steps (PHP).
   =========================================================================== */

:root{
  /* paper + ink */
  --ground:#EBEDEA; --surface:#FFFFFF; --surface-2:#E2E6E2; --surface-3:#F4F6F3;
  --ink:#12191A; --ink-2:#384648; --muted:#6C7A7B;
  --line:#CED5D2; --line-2:#B4BEBB;
  /* signal */
  --accent:#0B6B5E; --accent-2:#085146; --accent-soft:#D8EAE5; --on-accent:#FFFFFF;
  --warn:#A34A24; --warn-soft:#F3E4DA;
  --gold:#7E6210; --gold-soft:#F1E8CE; --gold-line:#C9B87A;
  --bad:#98332B;
  --code-bg:#0C1517; --code-ink:#D3E1DD; --code-dim:#798C89; --code-accent:#79C9B6;
  /* type */
  --mono:"Courier New",Courier,"Nimbus Mono PS","Liberation Mono",monospace;
  --sans:"IBM Plex Sans","Helvetica Neue",Arial,sans-serif;
  --shadow:0 1px 2px rgba(18,25,26,.06),0 10px 28px -14px rgba(18,25,26,.22);
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --ground:#0A1012; --surface:#111A1B; --surface-2:#182224; --surface-3:#0E1719;
    --ink:#E6EDEB; --ink-2:#B7C5C3; --muted:#7F9290;
    --line:#202C2E; --line-2:#2C3A3C;
    --accent:#4FC1AA; --accent-2:#78D4C0; --accent-soft:#0F2E2A; --on-accent:#06110F; --on-accent:#06110F;
    --warn:#DC8B60; --warn-soft:#2F1F19;
    --gold:#D8BC63; --gold-soft:#2A2413; --gold-line:#4A3F1C;
    --bad:#E8857A;
    --code-bg:#060C0D; --code-ink:#D3E1DD; --code-dim:#6B7E7B; --code-accent:#79C9B6;
    --shadow:0 1px 2px rgba(0,0,0,.55),0 12px 30px -16px rgba(0,0,0,.75);
  }
}
:root[data-theme="dark"]{
  --ground:#0A1012; --surface:#111A1B; --surface-2:#182224; --surface-3:#0E1719;
  --ink:#E6EDEB; --ink-2:#B7C5C3; --muted:#7F9290;
  --line:#202C2E; --line-2:#2C3A3C;
  --accent:#4FC1AA; --accent-2:#78D4C0; --accent-soft:#0F2E2A; --on-accent:#06110F;
  --warn:#DC8B60; --warn-soft:#2F1F19;
  --gold:#D8BC63; --gold-soft:#2A2413; --gold-line:#4A3F1C;
  --bad:#E8857A;
  --code-bg:#060C0D; --code-ink:#D3E1DD; --code-dim:#6B7E7B; --code-accent:#79C9B6;
  --shadow:0 1px 2px rgba(0,0,0,.55),0 12px 30px -16px rgba(0,0,0,.75);
}

*{box-sizing:border-box}
body{background:var(--ground);color:var(--ink);font-family:var(--sans);font-size:16.5px;line-height:1.66;-webkit-font-smoothing:antialiased}
a{color:var(--accent-2);text-decoration-thickness:1px;text-underline-offset:2px}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:2px}
@media (prefers-reduced-motion: reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
html{scroll-behavior:smooth}
.skip{position:absolute;left:-9999px;top:0;background:var(--surface);color:var(--ink);padding:10px 14px;border:1px solid var(--line);z-index:60;font-family:var(--mono);font-size:14px}
.skip:focus{left:0}

/* ---------- shell ---------- */
.shell{display:grid;grid-template-columns:300px minmax(0,1fr);max-width:1520px;margin:0 auto;min-height:100vh}
.topbar{display:none}
.main{padding-block:0 80px;padding-inline:clamp(16px,4vw,64px);min-width:0}
article{max-width:70ch;margin:0 auto}

/* ---------- sidebar ---------- */
.side{border-right:1px solid var(--line);background:var(--surface);position:sticky;top:0;height:100vh;overflow-y:auto;padding-block:22px 40px;padding-inline:20px}
.brand{display:block;text-decoration:none;color:var(--ink)}
.brand b{font-family:var(--mono);font-weight:700;font-size:17px;letter-spacing:-.02em;line-height:1.25;display:block}
.brand b::before{content:"$ ";color:var(--accent)}
.brand span{display:block;margin-top:4px;font-family:var(--mono);font-size:10px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.byline{font-family:var(--mono);font-size:10px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin:10px 0 0;line-height:1.6}
.byline a{color:var(--ink-2);text-decoration:none;border-bottom:1px solid var(--line-2)}
.byline a:hover{color:var(--accent-2);border-color:var(--accent)}
.overall{margin:18px 0 6px}
.overall .lbl{display:flex;justify-content:space-between;font-family:var(--mono);font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-bottom:6px}
.bar{height:6px;background:var(--surface-2);border:1px solid var(--line);overflow:hidden}
.bar i{display:block;height:100%;background:var(--accent);width:0}
.finder{width:100%;margin:14px 0 10px;padding:8px 10px;font-family:var(--mono);font-size:12px;color:var(--ink);background:var(--surface-3);border:1px solid var(--line);border-radius:0}
.finder::placeholder{color:var(--muted)}
.modlist{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:1px}
.modhead{width:100%;display:grid;grid-template-columns:auto 1fr;gap:9px;align-items:start;background:none;border:0;padding:9px 6px;text-align:left;cursor:pointer;color:var(--ink);font-family:var(--mono);font-size:13.5px;font-weight:700;letter-spacing:-.01em}
.modhead:hover{background:var(--surface-2)}
.modhead .n{font-family:var(--mono);font-size:11px;font-weight:700;color:var(--accent-2);padding-top:2px}
.modhead .n::before{content:"["}
.modhead .n::after{content:"]"}
.meter{display:flex;gap:2px;margin-top:7px}
.meter i{height:3px;flex:1;background:var(--line-2)}
.meter i.on{background:var(--accent)}
.lessons{list-style:none;margin:1px 0 7px;padding:0 0 0 28px;display:flex;flex-direction:column;gap:0}
.lessons.hide{display:none}
.lnk{display:grid;grid-template-columns:auto 1fr;gap:8px;align-items:baseline;padding:5px 7px;text-decoration:none;color:var(--ink-2);font-family:var(--mono);font-size:12.5px;line-height:1.4}
.lnk:hover{background:var(--surface-2);color:var(--ink)}
.lnk.cur{background:var(--accent-soft);color:var(--ink)}
.lnk .dot{width:7px;height:7px;border:1.5px solid var(--line-2);flex:none;transform:translateY(-1px)}
.lnk.done .dot{background:var(--accent);border-color:var(--accent)}
.lnk .lock{font-size:10px;color:var(--muted)}
.sidefoot{margin-top:22px;padding-top:16px;border-top:1px dashed var(--line-2);display:flex;flex-direction:column;gap:1px}
.sidefoot a{display:block;padding:6px 7px;font-family:var(--mono);font-size:12.5px;text-decoration:none;color:var(--ink-2)}
.sidefoot a:hover{background:var(--surface-2);color:var(--ink)}
.sidefoot a.cur{background:var(--accent-soft);color:var(--ink)}
.sidefoot a.ext{color:var(--muted);font-size:11.5px}

/* ---------- article chrome ---------- */
.eyebrow{font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--accent-2);display:flex;gap:9px;flex-wrap:wrap;align-items:center;padding-top:42px}
.eyebrow .sep{color:var(--line-2)}
h1{font-family:var(--mono);font-weight:700;font-size:clamp(27px,4vw,40px);line-height:1.14;letter-spacing:-.035em;text-wrap:balance;margin:14px 0 0}
.lede{font-size:clamp(17px,2.1vw,19.5px);line-height:1.55;color:var(--ink-2);margin:16px 0 0;text-wrap:pretty}
.rule{height:0;border-top:1px dashed var(--line-2);margin:28px 0 4px}
article h2{font-family:var(--mono);font-weight:700;font-size:21px;letter-spacing:-.025em;line-height:1.25;margin:38px 0 12px;text-wrap:balance}
article h2::before{content:"## ";color:var(--muted);font-weight:400}
article h3{font-family:var(--mono);font-weight:700;font-size:16.5px;letter-spacing:-.015em;margin:26px 0 8px}
article h3::before{content:"### ";color:var(--muted);font-weight:400}
article p{margin:0 0 16px}
article ul,article ol{margin:0 0 18px;padding-left:22px;display:flex;flex-direction:column;gap:8px}
article li::marker{color:var(--accent);font-family:var(--mono)}
article strong{font-weight:600}
article em{font-style:italic}
article code{font-family:var(--mono);font-size:.92em;background:var(--surface-2);padding:1px 5px;border:1px solid var(--line)}
.term{font-family:var(--mono);font-size:.9em;color:var(--accent-2);background:var(--accent-soft);padding:1px 5px;border-bottom:1px solid var(--accent)}

/* ---------- code + prompt blocks ---------- */
.block{margin:0 0 20px;border:1px solid var(--line);background:var(--code-bg)}
.block .block-label{font-family:var(--mono);font-size:10px;letter-spacing:.12em;text-transform:uppercase;color:var(--code-dim);padding:9px 14px 0}
.block .block-label::before{content:"// "}
.block pre{margin:0;padding:8px 14px 14px;overflow-x:auto;color:var(--code-ink);font-family:var(--mono);font-size:13px;line-height:1.62;white-space:pre-wrap;word-break:break-word;tab-size:2}
.block pre.nowrap{white-space:pre}

/* ---------- callouts ---------- */
.try,.watch,.solution,.upsell{margin:0 0 22px;padding:16px 18px;background:var(--surface)}
.try{border-left:3px solid var(--accent)}
.watch{border-left:3px solid var(--warn);background:var(--warn-soft)}
.solution{border-left:3px solid var(--line-2);background:var(--surface-3)}
.try h4,.watch h4,.solution h4{font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;margin:0 0 8px;font-weight:700}
.try h4{color:var(--accent-2)}
.watch h4{color:var(--warn)}
.solution h4{color:var(--muted)}
.try > :last-child,.watch > :last-child,.solution > :last-child{margin-bottom:0}
details.solution{padding:0;border-left:3px solid var(--line-2)}
details.solution > summary{cursor:pointer;list-style:none;padding:14px 18px;font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);font-weight:700}
details.solution > summary::-webkit-details-marker{display:none}
details.solution > summary::before{content:"[+] ";color:var(--accent-2)}
details.solution[open] > summary::before{content:"[-] "}
details.solution .sol-body{padding:0 18px 16px}
details.solution .sol-body > :last-child{margin-bottom:0}

/* ---------- tables ---------- */
.cmp{width:100%;border-collapse:collapse;margin:0;font-size:14.5px}
.cmp th,.cmp td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top}
.cmp th{font-family:var(--mono);font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);font-weight:700;border-bottom:1px solid var(--line-2)}
.scroll{overflow-x:auto;margin:0 0 22px}

/* ---------- takeaways, quiz ---------- */
.takeaways{margin:34px 0 0;padding:18px 20px;border:1px solid var(--line);background:var(--surface)}
.takeaways h4{font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:0 0 10px;font-weight:700}
.takeaways ul{margin:0;padding-left:20px}
details.check{margin:18px 0 0;border:1px solid var(--line);background:var(--surface);padding:14px 18px}
details.check summary{cursor:pointer;font-family:var(--mono);font-weight:700;font-size:14.5px;list-style:none;line-height:1.45}
details.check summary::-webkit-details-marker{display:none}
details.check summary::before{content:"? ";color:var(--accent-2)}
details.check p{margin:12px 0 0;color:var(--ink-2)}

.quiz{margin:22px 0 0;border:1px solid var(--line);background:var(--surface);padding:18px 20px}
.quiz h4{font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:0 0 10px;font-weight:700}
.quiz p.q{margin:0 0 14px;font-weight:600}
.quiz ol{list-style:none;margin:0;padding:0;gap:6px;display:flex;flex-direction:column}
.quiz button.opt{width:100%;text-align:left;display:grid;grid-template-columns:auto 1fr;gap:10px;align-items:start;font-family:var(--mono);font-size:13.5px;line-height:1.45;padding:10px 12px;background:var(--surface-3);border:1px solid var(--line);color:var(--ink);cursor:pointer}
.quiz button.opt:hover{border-color:var(--line-2)}
.quiz button.opt .k{color:var(--muted)}
.quiz button.opt.right{border-color:var(--accent);background:var(--accent-soft)}
.quiz button.opt.wrong{border-color:var(--warn);background:var(--warn-soft)}
.quiz .why{margin:14px 0 0;font-size:15px;color:var(--ink-2)}
.quiz .why[hidden]{display:none}

/* ---------- figures ---------- */
figure{margin:0 0 24px;padding:20px 20px 16px;background:var(--surface);border:1px solid var(--line)}
figure svg{width:100%;height:auto;max-width:100%;display:block}
figcaption{font-family:var(--mono);font-size:11px;color:var(--muted);margin-top:14px;padding-top:12px;border-top:1px dashed var(--line-2);line-height:1.55}

/* ---------- lesson footer ---------- */
.lessonfoot{display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between;margin-top:34px;padding-top:20px;border-top:1px dashed var(--line-2)}
/* The theme-dependent part of this button is a TOKEN, not a second rule.
   It used to be ":root[data-theme=dark] .mark{color:#06110F}", which at
   (0,3,0) outranked ".mark.done" at (0,2,0) — so clicking the button cleared
   its background but left the text near-black on a dark ground, i.e. invisible
   in exactly the state that tells you the click worked. A token carries the
   theme without carrying specificity, so the .done state simply wins. */
.mark{font-family:var(--mono);font-weight:700;font-size:13px;padding:10px 16px;border:1px solid var(--accent);background:var(--accent);color:var(--on-accent);cursor:pointer}
.mark:hover{border-color:var(--accent-2);background:var(--accent-2)}
.mark:disabled{opacity:.55;cursor:progress}
.mark.done{background:transparent;color:var(--accent-2);border-color:var(--accent-2)}
.mark.done::before{content:"\2713\00a0";font-weight:700}
.mark.done:hover{background:var(--accent-soft);color:var(--accent-2)}
.nav{display:flex;gap:8px;flex-wrap:wrap}
.nav a{font-family:var(--mono);font-size:12.5px;font-weight:700;text-decoration:none;color:var(--ink-2);border:1px solid var(--line);padding:9px 13px;background:var(--surface);max-width:34ch;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.nav a:hover{border-color:var(--line-2);color:var(--ink)}
.creditfoot{margin-top:30px;padding-top:16px;border-top:1px dashed var(--line-2);font-family:var(--mono);font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.creditfoot a{color:var(--ink-2);text-decoration:none;border-bottom:1px solid var(--line-2)}
.creditfoot a:hover{color:var(--accent-2);border-color:var(--accent)}

/* ---------- home ---------- */
.home{max-width:76ch}
.home .hero-meta{font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);display:flex;gap:8px;flex-wrap:wrap;padding-top:46px}
.home .hero-meta span::before{content:"[ "}
.home .hero-meta span::after{content:" ]"}
.home h1{font-size:clamp(30px,5.4vw,52px)}
.home .byline{font-size:11px;margin:18px 0 0}
.kicker{font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:44px 0 10px}
.kicker::before{content:"— "}
.modcards{display:flex;flex-direction:column;border-top:1px solid var(--line);margin:24px 0 0}
.modcard{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:18px;align-items:start;padding:18px 4px;border-bottom:1px solid var(--line);text-decoration:none;color:var(--ink)}
.modcard:hover{background:var(--surface)}
.modcard .num{font-family:var(--mono);font-size:12px;font-weight:700;color:var(--accent-2);padding-top:3px}
.modcard h3{font-family:var(--mono);font-weight:700;font-size:17.5px;letter-spacing:-.025em;margin:0 0 4px}
.modcard h3::before,.upsell h2::before,.pricebox h2::before,.takeaways h4::before,figure h3::before{content:none}
.modcard p{margin:0;color:var(--ink-2);font-size:15px;line-height:1.5}
.modcard .cnt{font-family:var(--mono);font-size:11px;color:var(--muted);white-space:nowrap;padding-top:5px}

/* ---------- glossary ---------- */
.glist{display:grid;border-top:1px solid var(--line);margin-top:20px}
.gitem{display:grid;grid-template-columns:minmax(150px,230px) minmax(0,1fr);gap:18px;padding:13px 4px;border-bottom:1px solid var(--line)}
.gitem dt{font-family:var(--mono);font-size:13px;font-weight:700;color:var(--ink)}
.gitem dd{margin:0;color:var(--ink-2);font-size:15px;line-height:1.5}
.gcat{font-family:var(--mono);font-weight:700;font-size:17px;margin:32px 0 0;letter-spacing:-.02em}
.gcat::before{content:"## ";color:var(--muted);font-weight:400}

/* ===========================================================================
   Paid-course additions: upsell, pricing, paywall, forms, badges
   =========================================================================== */
.upsell{border-left:3px solid var(--gold);background:var(--gold-soft)}
.upsell h4{font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;margin:0 0 8px;font-weight:700;color:var(--gold)}
:root[data-theme="dark"] .upsell h4,
:root:not([data-theme="light"]) .upsell h4{color:#D8BC63}
.upsell p:last-child{margin-bottom:0}
.upsell .btn{margin-top:12px}

.btn{display:inline-block;font-family:var(--mono);font-weight:700;font-size:13.5px;letter-spacing:.02em;padding:12px 20px;border:1px solid var(--accent);background:var(--accent);color:#FFF;text-decoration:none;cursor:pointer}
.btn:hover{background:var(--accent-2);border-color:var(--accent-2)}
.btn.ghost{background:transparent;color:var(--accent-2)}
.btn.ghost:hover{background:var(--accent-soft)}
.btn[disabled]{opacity:.55;cursor:not-allowed}
:root[data-theme="dark"] .btn,
:root:not([data-theme="light"]) .btn{color:#06110F}
:root[data-theme="dark"] .btn.ghost,
:root:not([data-theme="light"]) .btn.ghost{color:var(--accent-2)}

.badge{display:inline-block;font-family:var(--mono);font-size:10px;letter-spacing:.12em;text-transform:uppercase;padding:3px 7px;border:1px solid var(--line-2);color:var(--muted)}
.badge.free{border-color:var(--accent);color:var(--accent-2);background:var(--accent-soft)}
.badge.paid{border-color:var(--gold);color:var(--gold);background:var(--gold-soft)}
:root[data-theme="dark"] .badge.paid,
:root:not([data-theme="light"]) .badge.paid{color:#D8BC63}

.pricebox{border:1px solid var(--line-2);background:var(--surface);padding:26px 26px 22px;margin:26px 0}
.pricebox .amount{font-family:var(--mono);font-weight:700;font-size:44px;letter-spacing:-.04em;line-height:1;margin:0}
.pricebox .amount small{font-size:15px;font-weight:400;color:var(--muted);letter-spacing:0;margin-left:8px}
.pricebox ul{list-style:none;margin:18px 0;padding:0;display:flex;flex-direction:column;gap:8px;font-size:15px}
.pricebox ul li{display:grid;grid-template-columns:auto 1fr;gap:10px}
.pricebox ul li::before{content:"+";font-family:var(--mono);color:var(--accent);font-weight:700}
/* Visually hidden, but still submitted with the form and still reachable to a
   bot parsing the HTML — the honeypot in the buy form.

   This lives here rather than in a style="" attribute because the paid
   course sends a strict Content-Security-Policy, and style-src without
   'unsafe-inline' blocks inline style ATTRIBUTES as well as <style> blocks.
   An inline style on this element is silently dropped by the browser and the
   trap becomes a visible "Leave this empty" box above the buy button. Keep
   every rule in this file; do not reintroduce style="". */
.hp{position:absolute;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden}

/* The "already bought it?" line under a paywall: same muted fine print, but
   set in the body face rather than the mono face. */
.fine.body{font-family:var(--sans);font-size:13px;color:var(--muted);margin-top:14px;letter-spacing:0}

.pricebox .fine{font-family:var(--mono);font-size:11px;color:var(--muted);margin:14px 0 0;line-height:1.6}

.paywall{border:1px dashed var(--line-2);background:var(--surface);padding:28px 26px;margin:30px 0 0;text-align:left}
.paywall h2{margin-top:0}
.paywall h2::before{content:none}
.paywall .cut{font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:0 0 14px}

.field{display:flex;flex-direction:column;gap:6px;margin:0 0 16px}
.field label{font-family:var(--mono);font-size:10.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.field input{font-family:var(--mono);font-size:14px;padding:11px 12px;border:1px solid var(--line-2);background:var(--surface-3);color:var(--ink)}
.field input:focus{border-color:var(--accent)}
.field .hint{font-family:var(--mono);font-size:11px;color:var(--muted)}
.notice{border-left:3px solid var(--accent);background:var(--accent-soft);padding:14px 16px;margin:0 0 20px;font-size:15px}
.notice.bad{border-left-color:var(--warn);background:var(--warn-soft)}
.notice p:last-child{margin-bottom:0}

.steps{list-style:none;margin:22px 0;padding:0;display:flex;flex-direction:column;gap:0;border-top:1px solid var(--line)}
.steps li{display:grid;grid-template-columns:auto 1fr;gap:14px;padding:14px 4px;border-bottom:1px solid var(--line)}
.steps li .s{font-family:var(--mono);font-size:11px;font-weight:700;color:var(--accent-2);padding-top:3px}
.steps li .s::before{content:"["}
.steps li .s::after{content:"]"}

.faq{margin:22px 0}
.faq details{border-bottom:1px solid var(--line);padding:14px 0}
.faq summary{cursor:pointer;list-style:none;font-family:var(--mono);font-weight:700;font-size:14.5px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"+ ";color:var(--accent-2)}
.faq details[open] summary::before{content:"- "}
.faq details p{margin:12px 0 0;color:var(--ink-2)}

.modcard.locked{opacity:.82}
.modcard .badge{margin-top:2px}

/* ---------- responsive ---------- */
@media (max-width:920px){
  .shell{grid-template-columns:minmax(0,1fr)}
  .topbar{display:flex;position:sticky;top:0;z-index:20;align-items:center;gap:12px;justify-content:space-between;background:var(--surface);border-bottom:1px solid var(--line);padding-block:10px;padding-inline:16px}
  .topbar b{font-family:var(--mono);font-weight:700;font-size:14px;letter-spacing:-.02em}
  .topbar b::before{content:"$ ";color:var(--accent)}
  .burger{font-family:var(--mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;background:var(--surface-3);border:1px solid var(--line);color:var(--ink);padding:8px 12px;cursor:pointer}
  .side{position:fixed;z-index:30;top:0;left:0;width:min(88vw,330px);box-shadow:var(--shadow);transform:translateX(-102%);transition:transform .22s ease}
  .side.open{transform:none}
  .scrim{position:fixed;inset:0;background:rgba(6,12,13,.55);z-index:25;display:none}
  .scrim.on{display:block}
  .eyebrow,.home .hero-meta{padding-top:26px}
  .gitem{grid-template-columns:minmax(0,1fr);gap:4px}
  .pricebox{padding:20px}
}

/* ===========================================================================
   Discount code on the sales page
   =========================================================================== */
.field .opt{color:var(--muted);font-weight:400}
.hint.bad{color:var(--bad)}
#code{font-family:var(--mono);letter-spacing:.06em;text-transform:uppercase}
.quoted{font-family:var(--mono);font-size:14px;margin:10px 0 0;padding:10px 12px;border:1px dashed var(--line-2);background:var(--surface-2);color:var(--ink)}
.quoted.isfree{border-style:solid;border-color:var(--accent);color:var(--accent)}

/* ===========================================================================
   Admin area

   Deliberately plainer than the course: dense tables, no decoration, nothing
   that has to be re-read at a glance. It shares the course's tokens so light
   and dark both work with no extra rules.
   =========================================================================== */
.admin{max-width:1000px;margin:0 auto;padding-block:28px 60px;padding-inline:20px}
.admin h1{font-family:var(--mono);font-size:26px;letter-spacing:-.02em;margin:0 0 22px}
.admin h1::before,.admin h2::before{content:none}
.admin h2{font-family:var(--mono);font-size:15px;text-transform:uppercase;letter-spacing:.12em;color:var(--muted);margin:34px 0 12px;font-weight:400}

.adminnav{display:flex;flex-wrap:wrap;gap:18px;align-items:center;font-family:var(--mono);font-size:13px;text-transform:uppercase;letter-spacing:.1em;border-bottom:1px solid var(--line);padding-bottom:12px;margin-bottom:26px}
.adminnav a{color:var(--muted);text-decoration:none;border-bottom:1px solid transparent;padding-bottom:2px}
.adminnav a:hover{color:var(--ink)}
.adminnav a.cur{color:var(--accent);border-bottom-color:var(--accent)}
.adminnav .inline{margin-left:auto}

.statgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(190px,100%),1fr));gap:14px;margin:0 0 10px}
.stat{border:1px solid var(--line);background:var(--surface);padding:16px 18px;display:flex;flex-direction:column;gap:4px}
.statlabel{font-family:var(--mono);font-size:11px;text-transform:uppercase;letter-spacing:.12em;color:var(--muted)}
.statvalue{font-family:var(--mono);font-size:28px;font-weight:700;letter-spacing:-.03em;line-height:1.1}
.statnote{font-size:12.5px;color:var(--muted)}

.tablewrap{overflow-x:auto}
.admintable{width:100%;border-collapse:collapse;font-size:14px}
.admintable th{font-family:var(--mono);font-size:11px;text-transform:uppercase;letter-spacing:.1em;color:var(--muted);font-weight:400;text-align:left;border-bottom:1px solid var(--line-2);padding:8px 10px;white-space:nowrap}
.admintable td{border-bottom:1px solid var(--line);padding:9px 10px;vertical-align:top}
.admintable tr.off td{opacity:.55}
.admintable .num{text-align:right;white-space:nowrap}
.admintable .mono{font-family:var(--mono);font-size:13px}
.admintable .dim{color:var(--muted)}
.admintable .note{display:block;font-family:var(--sans);font-size:12px;color:var(--muted);margin-top:2px}
.admintable .was{display:inline-block;margin-left:6px;color:var(--muted);text-decoration:line-through;font-size:12px}
.admintable .barcell{width:120px}
.admintable .bar{display:block;height:8px;background:var(--accent);opacity:.8;min-width:2px}
.rowactions{white-space:nowrap;font-family:var(--mono);font-size:12px}
.rowactions a,.rowactions .linkish{margin-right:10px}

.pill{display:inline-block;font-family:var(--mono);font-size:11px;text-transform:uppercase;letter-spacing:.08em;padding:2px 7px;border:1px solid var(--line-2);color:var(--muted)}
.pill.paid,.pill.confirmed{color:var(--accent);border-color:var(--accent)}
.pill.free{color:var(--gold);border-color:var(--gold)}
.pill.failed,.pill.canceled,.pill.expired,.pill.released{color:var(--bad);border-color:var(--bad)}
.pill.off{color:var(--muted)}

.tabs{display:flex;flex-wrap:wrap;gap:14px;font-family:var(--mono);font-size:12px;text-transform:uppercase;letter-spacing:.1em;margin:0 0 16px}
.tabs a{color:var(--muted);text-decoration:none}
.tabs a.cur{color:var(--accent)}

.adminform{max-width:560px;display:flex;flex-direction:column;gap:18px;margin-top:6px}
.adminform fieldset{border:1px solid var(--line);padding:14px 16px;margin:0}
.adminform legend{font-family:var(--mono);font-size:11px;text-transform:uppercase;letter-spacing:.12em;color:var(--muted);padding:0 6px}
.adminform .radio,.check{display:flex;align-items:center;gap:8px;font-size:14.5px;margin:4px 0}
.adminform .radio input,.check input{width:auto;margin:0}
.formactions{display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.formerror{border:1px solid var(--bad);color:var(--bad);padding:10px 12px;font-size:14px;margin:0 0 18px}
.notice{border:1px solid var(--accent);color:var(--accent);padding:10px 12px;font-size:14px;margin:0 0 18px}
.empty{color:var(--muted);font-style:italic}
.linkish{background:none;border:0;padding:0;color:var(--muted);font:inherit;cursor:pointer;text-decoration:underline}
.linkish:hover{color:var(--ink)}
.inline{display:inline}

.facts{display:grid;grid-template-columns:auto minmax(0,1fr);gap:8px 20px;font-size:14.5px;margin:0 0 22px}
.facts dt{font-family:var(--mono);font-size:11px;text-transform:uppercase;letter-spacing:.1em;color:var(--muted);padding-top:3px}
.facts dd{margin:0}

@media (max-width:640px){
  .admin{padding-inline:16px}
  .statgrid{grid-template-columns:repeat(auto-fit,minmax(min(140px,100%),1fr))}
  .statvalue{font-size:22px}
}

/* The admin area renders without the course sidebar, so its main column owns
   the full width rather than sitting in the shell grid. */
.main.bare{max-width:none;padding:0;margin:0}

/* ===========================================================================
   Theme switcher

   Three states, because the stylesheet has always had three: an explicit
   light, an explicit dark, and "whatever the operating system says", which is
   the default and the one most people want. A two-way toggle cannot express
   the third, and silently strands anyone who switches their OS to dark in the
   evening.
   =========================================================================== */
.themer{display:flex;gap:0;margin-top:16px;border:1px solid var(--line);width:-moz-fit-content;width:fit-content}
.themer button{font-family:var(--mono);font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;padding:6px 9px;background:transparent;color:var(--muted);border:0;border-right:1px solid var(--line);cursor:pointer;line-height:1}
.themer button:last-child{border-right:0}
.themer button:hover{color:var(--ink)}
.themer button[aria-pressed="true"]{background:var(--accent);color:var(--on-accent)}
.themer-label{display:block;font-family:var(--mono);font-size:10px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-top:18px}

/* In the admin bar it sits inline with the links rather than in a sidebar. */
.adminnav .themer{margin-top:0;margin-left:auto}
.adminnav .inline{margin-left:0}