/* ============================================================
   JONATHAN'S AI SCHOOL — tech-heritage design system
   Palette: oxide indigo + copper interconnect
   ============================================================ */

:root{
  --bg:        #f4f1e9;   /* ceramic package */
  --bg-raised: #fbf9f3;
  --ink:       #201d38;   /* oxide indigo, near-black */
  --ink-soft:  #55516e;
  --indigo:    #2e2a5e;
  --copper:    #a85f2e;   /* interconnect */
  --copper-hi: #c4763f;
  --trace:     #d8d2c2;   /* faint trace lines */
  --card-edge: #c9c2b0;
  --pin:       #8a8496;
  --ok:        #2e6b4f;
  --shadow:    0 2px 0 rgba(32,29,56,.12);
  color-scheme: light;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:        #14121f;
    --bg-raised: #1b1830;
    --ink:       #e9e5d8;
    --ink-soft:  #a29dbb;
    --indigo:    #8f88d8;
    --copper:    #d98a52;
    --copper-hi: #e79c63;
    --trace:     #2b2745;
    --card-edge: #363154;
    --pin:       #6c6787;
    --ok:        #6fbf97;
    --shadow:    0 2px 0 rgba(0,0,0,.4);
    color-scheme: dark;
  }
}
:root[data-theme="dark"]{
  --bg:        #14121f;
  --bg-raised: #1b1830;
  --ink:       #e9e5d8;
  --ink-soft:  #a29dbb;
  --indigo:    #8f88d8;
  --copper:    #d98a52;
  --copper-hi: #e79c63;
  --trace:     #2b2745;
  --card-edge: #363154;
  --pin:       #6c6787;
  --ok:        #6fbf97;
  --shadow:    0 2px 0 rgba(0,0,0,.4);
  color-scheme: dark;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--bg);
  color:var(--ink);
  font-family:"Archivo",-apple-system,"Helvetica Neue",Arial,sans-serif;
  font-size:17px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
.mono{font-family:"IBM Plex Mono","SF Mono",Menlo,monospace}
a{color:var(--copper);text-decoration:none}
a:hover{color:var(--copper-hi);text-decoration:underline}
img{max-width:100%}

.wrap{max-width:1060px;margin:0 auto;padding:0 24px}

/* ---- circuit-trace divider ---- */
.trace{
  height:14px;position:relative;margin:0;
  background:
    radial-gradient(circle 3px at 20% 50%, var(--copper) 2.4px, transparent 3px),
    radial-gradient(circle 3px at 52% 50%, var(--copper) 2.4px, transparent 3px),
    radial-gradient(circle 3px at 83% 50%, var(--copper) 2.4px, transparent 3px),
    linear-gradient(var(--trace),var(--trace)) 0 50%/100% 1px no-repeat;
  background-repeat:no-repeat;
}

/* ---- header ---- */
header.site{
  border-bottom:1px solid var(--trace);
  position:sticky;top:0;background:var(--bg);z-index:50;
}
.site-inner{display:flex;align-items:center;gap:18px;padding:14px 0;flex-wrap:wrap}
.wordmark{
  font-family:"IBM Plex Mono",monospace;font-weight:700;font-size:.95rem;
  letter-spacing:.12em;color:var(--ink);text-transform:uppercase;white-space:nowrap;
}
.wordmark:hover{text-decoration:none;color:var(--copper)}
.wordmark b{color:var(--copper)}
nav.main{display:flex;gap:20px;margin-left:auto;flex-wrap:wrap}
nav.main a{
  font-family:"IBM Plex Mono",monospace;font-size:.78rem;letter-spacing:.09em;
  text-transform:uppercase;color:var(--ink-soft);
}
nav.main a:hover{color:var(--copper);text-decoration:none}
#theme-btn{
  background:none;border:1px solid var(--card-edge);color:var(--ink-soft);
  font-family:"IBM Plex Mono",monospace;font-size:.72rem;letter-spacing:.08em;
  padding:5px 10px;cursor:pointer;border-radius:3px;
}
#theme-btn:hover{border-color:var(--copper);color:var(--copper)}

/* ---- hero ---- */
.hero{padding:84px 0 64px;position:relative;overflow:hidden}
.hero .eyebrow{
  font-family:"IBM Plex Mono",monospace;font-size:.75rem;letter-spacing:.22em;
  text-transform:uppercase;color:var(--copper);margin-bottom:22px;
}
.hero h1{
  font-weight:800;font-size:clamp(2.2rem,5.6vw,4rem);line-height:1.04;
  letter-spacing:-.015em;max-width:15ch;text-wrap:balance;
}
.hero h1 em{font-style:normal;color:var(--copper)}
.hero .sub{
  margin-top:26px;max-width:56ch;font-size:1.12rem;color:var(--ink-soft);
}
.hero .sub strong{color:var(--ink)}
.cta-row{margin-top:36px;display:flex;gap:14px;flex-wrap:wrap;align-items:center}

.btn{
  display:inline-block;font-family:"IBM Plex Mono",monospace;font-size:.85rem;
  letter-spacing:.08em;text-transform:uppercase;padding:14px 26px;border-radius:3px;
  border:1px solid transparent;cursor:pointer;
}
.btn:hover{text-decoration:none}
.btn-copper{
  background:var(--copper);color:#fff;box-shadow:var(--shadow);
}
.btn-copper:hover{background:var(--copper-hi);color:#fff}
.btn-ghost{border-color:var(--card-edge);color:var(--ink)}
.btn-ghost:hover{border-color:var(--copper);color:var(--copper)}

.chipmark{position:absolute;right:24px;top:70px;opacity:.9}
@media(max-width:820px){.chipmark{display:none}}

/* ---- sections ---- */
section.block{padding:72px 0}
.kicker{
  font-family:"IBM Plex Mono",monospace;font-size:.72rem;letter-spacing:.22em;
  text-transform:uppercase;color:var(--copper);margin-bottom:10px;
}
.block h2{font-size:clamp(1.6rem,3.4vw,2.3rem);font-weight:800;letter-spacing:-.01em;margin-bottom:14px}
.lede{color:var(--ink-soft);max-width:62ch;margin-bottom:38px}
.lede strong{color:var(--ink)}

/* ---- module cards ---- */
.modules{display:grid;gap:2px;border:1px solid var(--card-edge);background:var(--card-edge)}
.module{
  display:grid;grid-template-columns:110px 1fr auto;gap:20px;align-items:start;
  background:var(--bg-raised);padding:26px 26px;
}
@media(max-width:700px){.module{grid-template-columns:1fr;gap:8px}}
.module .pin{
  font-family:"IBM Plex Mono",monospace;font-size:.75rem;letter-spacing:.14em;
  color:var(--pin);padding-top:4px;
}
.module .pin b{display:block;color:var(--copper);font-size:1.4rem;letter-spacing:0}
.module h3{font-size:1.15rem;font-weight:700;letter-spacing:.01em;text-transform:uppercase}
.module p{color:var(--ink-soft);font-size:.95rem;margin-top:6px;max-width:58ch}
.module .go{
  font-family:"IBM Plex Mono",monospace;font-size:.74rem;letter-spacing:.1em;
  text-transform:uppercase;align-self:center;white-space:nowrap;
}
.tag{
  display:inline-block;font-family:"IBM Plex Mono",monospace;font-size:.66rem;
  letter-spacing:.12em;text-transform:uppercase;padding:3px 8px;border-radius:2px;
  vertical-align:2px;margin-left:10px;
}
.tag-free{background:var(--ok);color:#fff}
.tag-weekly{border:1px solid var(--card-edge);color:var(--ink-soft)}

/* ---- pricing ---- */
.price-card{
  max-width:460px;border:1px solid var(--card-edge);background:var(--bg-raised);
  padding:38px 36px;position:relative;box-shadow:var(--shadow);
}
.price-card::before{
  content:"";position:absolute;left:0;top:0;width:100%;height:4px;background:var(--copper);
}
.price-big{font-size:3.4rem;font-weight:800;letter-spacing:-.02em;line-height:1}
.price-big small{font-size:1rem;font-weight:500;color:var(--ink-soft);letter-spacing:0}
.price-card ul{list-style:none;margin:24px 0 28px}
.price-card li{
  padding:8px 0 8px 26px;position:relative;color:var(--ink-soft);font-size:.95rem;
  border-bottom:1px dashed var(--trace);
}
.price-card li::before{content:"▸";position:absolute;left:2px;color:var(--copper)}
.price-note{font-size:.85rem;color:var(--ink-soft);margin-top:16px}
.price-note code{
  font-family:"IBM Plex Mono",monospace;background:var(--trace);padding:1px 6px;border-radius:2px;
  color:var(--ink);font-size:.8rem;
}

/* ---- free lane ---- */
.free-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px}
@media(max-width:760px){.free-grid{grid-template-columns:1fr}}
.free-box{border:1px solid var(--card-edge);background:var(--bg-raised);padding:30px}
.free-box h3{font-size:1.05rem;text-transform:uppercase;letter-spacing:.04em;margin-bottom:10px}
.free-box p{color:var(--ink-soft);font-size:.95rem;margin-bottom:18px}
.email-row{display:flex;gap:8px;flex-wrap:wrap}
.email-row input{
  flex:1;min-width:200px;padding:12px 14px;font-family:"IBM Plex Mono",monospace;
  font-size:.85rem;border:1px solid var(--card-edge);background:var(--bg);
  color:var(--ink);border-radius:3px;
}
.email-row input:focus{outline:2px solid var(--copper);outline-offset:-1px}

/* ---- about ---- */
.about-grid{display:grid;grid-template-columns:auto 1fr;gap:44px;align-items:start}
@media(max-width:760px){.about-grid{grid-template-columns:1fr}}
.about p{max-width:60ch;color:var(--ink-soft)}
.about p strong{color:var(--ink)}
.about p + p{margin-top:14px}

/* ---- footer ---- */
footer.site{border-top:1px solid var(--trace);padding:34px 0 50px}
footer .foot-inner{
  display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;
  font-family:"IBM Plex Mono",monospace;font-size:.74rem;letter-spacing:.08em;
  color:var(--ink-soft);text-transform:uppercase;
}
footer a{color:var(--ink-soft)}
footer a:hover{color:var(--copper)}

/* ============================================================
   LESSON PAGES
   ============================================================ */
.lesson-head{padding:64px 0 40px;border-bottom:1px solid var(--trace)}
.lesson-head .crumb{
  font-family:"IBM Plex Mono",monospace;font-size:.74rem;letter-spacing:.14em;
  text-transform:uppercase;color:var(--ink-soft);margin-bottom:20px;
}
.lesson-head h1{font-size:clamp(1.8rem,4.4vw,3rem);font-weight:800;letter-spacing:-.01em;line-height:1.08;max-width:20ch}
.lesson-head .meta{
  margin-top:18px;font-family:"IBM Plex Mono",monospace;font-size:.76rem;
  letter-spacing:.1em;text-transform:uppercase;color:var(--copper);
}
article.lesson{max-width:680px;padding:52px 0 80px}
article.lesson h2{font-size:1.3rem;font-weight:800;margin:44px 0 12px;letter-spacing:.01em;text-transform:uppercase}
article.lesson h2 .n{color:var(--copper);font-family:"IBM Plex Mono",monospace;font-weight:700;margin-right:10px}
article.lesson p{margin:14px 0;color:var(--ink)}
article.lesson p.aside{color:var(--ink-soft);font-size:.95rem;border-left:3px solid var(--copper);padding-left:16px}
article.lesson ul{margin:14px 0 14px 22px}
article.lesson li{margin:8px 0}
article.lesson strong{color:var(--copper)}
.rule-card{
  border:1px solid var(--card-edge);background:var(--bg-raised);padding:20px 24px;margin:26px 0;
}
.rule-card .rc-label{
  font-family:"IBM Plex Mono",monospace;font-size:.7rem;letter-spacing:.18em;
  text-transform:uppercase;color:var(--copper);margin-bottom:6px;
}
.lesson-next{
  margin-top:56px;padding-top:28px;border-top:1px solid var(--trace);
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
}
.locked-list{list-style:none;margin:26px 0 0 0 !important}
.locked-list li{
  margin:0 !important;padding:16px 0 16px 34px;position:relative;
  border-bottom:1px dashed var(--trace);color:var(--ink-soft);
}
.locked-list li::before{
  content:"○";position:absolute;left:4px;color:var(--copper);font-size:1rem;
}
.locked-list li b{color:var(--ink);display:block;text-transform:uppercase;font-size:.92rem;letter-spacing:.03em}
.drop-banner{
  font-family:"IBM Plex Mono",monospace;font-size:.76rem;letter-spacing:.16em;
  text-transform:uppercase;color:var(--ok);border:1px solid var(--ok);
  display:inline-block;padding:6px 14px;border-radius:2px;margin-top:20px;
}