:root{
  --bg:#0d0d0c;
  --bg-elev:#161513;
  --bg-card:#1a1917;
  --line:#2a2824;
  --ink:#ece6d4;
  --ink-dim:#9a9384;
  --ink-faint:#5e584d;
  --amber:#ffb000;
  --amber-soft:#3a2a00;
  --green:#7bbf5a;
  --red:#e25c4a;
  --mono:'JetBrains Mono', ui-monospace, monospace;
  --serif:'Newsreader', Georgia, serif;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--bg);
  color:var(--ink);
  font-family:var(--serif);
  font-size:18px;
  line-height:1.65;
  font-feature-settings:"liga","kern";
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

/* Subtle grain overlay */
body::before{
  content:"";
  position:fixed;inset:0;
  pointer-events:none;
  opacity:.035;
  z-index:100;
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
}

a{color:var(--amber);text-decoration:none;border-bottom:1px solid transparent;transition:border-color .2s}
a:hover{border-bottom-color:var(--amber)}

/* ============ HERO ============ */
.hero{
  min-height:100vh;
  padding:clamp(24px,5vw,80px);
  display:flex;
  flex-direction:column;
  justify-content:space-between;
  position:relative;
  border-bottom:1px solid var(--line);
  background:
    radial-gradient(ellipse 80% 50% at 20% 10%, rgba(255,176,0,.06), transparent 60%),
    radial-gradient(ellipse 60% 40% at 90% 90%, rgba(123,191,90,.04), transparent 60%);
}

.hero-top{
  display:flex;
  justify-content:space-between;
  align-items:flex-start;
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--ink-dim);
}
.hero-top .meta-block{display:flex;flex-direction:column;gap:4px}
.hero-top strong{color:var(--ink);font-weight:500}

.hero-middle{
  max-width:1200px;
  margin:auto 0;
  padding:60px 0 40px;
}
.hero-eyebrow{
  font-family:var(--mono);
  font-size:13px;
  letter-spacing:.3em;
  text-transform:uppercase;
  color:var(--amber);
  margin-bottom:24px;
  display:flex;
  align-items:center;
  gap:12px;
}
.hero-eyebrow::before{
  content:"";
  display:inline-block;
  width:32px;height:1px;background:var(--amber);
}
.hero h1{
  font-family:var(--mono);
  font-weight:800;
  font-size:clamp(48px, 11vw, 168px);
  line-height:.9;
  letter-spacing:-.04em;
  color:var(--ink);
  margin-bottom:32px;
}
.hero h1 .accent{color:var(--amber)}
.hero h1 .cursor{
  display:inline-block;
  width:.6em;height:.85em;
  background:var(--amber);
  vertical-align:-12%;
  margin-left:.08em;
  animation:blink 1.05s steps(2,end) infinite;
}
@keyframes blink{50%{opacity:0}}

.hero-lede{
  font-family:var(--serif);
  font-size:clamp(18px, 1.6vw, 22px);
  line-height:1.55;
  max-width:680px;
  color:var(--ink-dim);
  font-style:italic;
}
.hero-lede em{color:var(--ink);font-style:normal}

.hero-bottom{
  display:flex;
  justify-content:space-between;
  align-items:flex-end;
  gap:40px;
  flex-wrap:wrap;
  padding-top:40px;
  border-top:1px solid var(--line);
  font-family:var(--mono);
  font-size:13px;
  color:var(--ink-dim);
}
.hero-stats{display:flex;gap:48px;flex-wrap:wrap}
.hero-stats .stat strong{
  display:block;
  font-size:32px;
  color:var(--ink);
  font-weight:700;
  margin-bottom:2px;
}

.scroll-cue{
  display:inline-flex;
  align-items:center;
  gap:10px;
  text-transform:uppercase;
  letter-spacing:.15em;
}
.scroll-cue::after{
  content:"↓";
  display:inline-block;
  animation:bob 1.6s ease-in-out infinite;
}
@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(4px)}}

/* ============ TOC ============ */
.toc{
  padding:clamp(60px,8vw,120px) clamp(24px,5vw,80px);
  border-bottom:1px solid var(--line);
}
.toc-head{
  display:flex;
  justify-content:space-between;
  align-items:baseline;
  margin-bottom:48px;
  flex-wrap:wrap;
  gap:20px;
}
.toc-head h2{
  font-family:var(--mono);
  font-weight:700;
  font-size:clamp(28px,4vw,44px);
  letter-spacing:-.02em;
}
.toc-head .label{
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--ink-dim);
}

.toc-list{list-style:none;max-width:1200px;margin:0 auto}
.toc-item{
  display:grid;
  grid-template-columns:80px 1fr auto;
  gap:32px;
  align-items:baseline;
  padding:22px 0;
  border-top:1px solid var(--line);
  transition:padding-left .25s ease;
}
.toc-item:hover{padding-left:12px}
.toc-item:last-child{border-bottom:1px solid var(--line)}
.toc-num{
  font-family:var(--mono);
  font-weight:700;
  font-size:24px;
  color:var(--amber);
}
.toc-title{
  font-family:var(--serif);
  font-size:clamp(20px,2.4vw,28px);
  font-weight:500;
  letter-spacing:-.01em;
}
.toc-title a{color:var(--ink);border:none}
.toc-title a:hover{color:var(--amber)}
.toc-meta{
  font-family:var(--mono);
  font-size:12px;
  color:var(--ink-faint);
  letter-spacing:.1em;
  text-transform:uppercase;
}

/* ============ LESSONS ============ */
.lessons{padding:clamp(60px,8vw,120px) 0}

.lesson{
  max-width:1200px;
  margin:0 auto;
  padding:clamp(40px,6vw,80px) clamp(24px,5vw,80px);
  border-bottom:1px solid var(--line);
}
.lesson:last-child{border-bottom:none}

.lesson-header{
  display:grid;
  grid-template-columns:1fr;
  gap:24px;
  margin-bottom:56px;
  padding-bottom:32px;
  border-bottom:1px dashed var(--line);
}
@media(min-width:900px){
  .lesson-header{grid-template-columns:240px 1fr;gap:48px;align-items:start}
}

.lesson-num{
  font-family:var(--mono);
  font-weight:800;
  font-size:clamp(80px,12vw,160px);
  line-height:.85;
  letter-spacing:-.06em;
  color:var(--amber);
  position:relative;
}
.lesson-num::after{
  content:attr(data-of);
  position:absolute;
  bottom:8px;
  font-family:var(--mono);
  font-size:14px;
  font-weight:500;
  color:var(--ink-faint);
  letter-spacing:.15em;
  margin-left:12px;
  letter-spacing:.1em;
}

.lesson-title-wrap{padding-top:8px}
.lesson-eyebrow{
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.25em;
  text-transform:uppercase;
  color:var(--ink-dim);
  margin-bottom:14px;
}
.lesson-title{
  font-family:var(--mono);
  font-weight:700;
  font-size:clamp(28px,3.6vw,44px);
  letter-spacing:-.02em;
  line-height:1.1;
  color:var(--ink);
  margin-bottom:18px;
}
.lesson-summary{
  font-family:var(--serif);
  font-style:italic;
  font-size:clamp(17px,1.4vw,20px);
  line-height:1.55;
  color:var(--ink-dim);
  max-width:640px;
}

/* Block sections inside lesson */
.block{margin-bottom:48px}
.block-label{
  display:inline-block;
  font-family:var(--mono);
  font-size:11px;
  font-weight:700;
  letter-spacing:.3em;
  text-transform:uppercase;
  color:var(--bg);
  background:var(--ink);
  padding:5px 12px 4px;
  margin-bottom:20px;
}
.block-label.theory{background:var(--ink);color:var(--bg)}
.block-label.practice{background:var(--green);color:var(--bg)}
.block-label.trick{background:var(--amber);color:var(--bg)}

.block h3{
  font-family:var(--mono);
  font-weight:500;
  font-size:22px;
  letter-spacing:-.01em;
  color:var(--ink);
  margin-bottom:16px;
}
.block p{margin-bottom:14px;color:var(--ink)}
.block p + p{margin-top:0}
.block ul{margin:14px 0 14px 0;padding-left:0;list-style:none}
.block li{
  padding-left:28px;
  position:relative;
  margin-bottom:8px;
}
.block li::before{
  content:"›";
  position:absolute;
  left:8px;top:0;
  color:var(--amber);
  font-family:var(--mono);
  font-weight:700;
}

code,.inline-code{
  font-family:var(--mono);
  font-size:.9em;
  background:var(--bg-elev);
  color:var(--amber);
  padding:2px 7px;
  border-radius:2px;
  border:1px solid var(--line);
  white-space:nowrap;
}

/* Terminal block */
.term{
  background:#0a0a09;
  border:1px solid var(--line);
  border-radius:6px;
  margin:20px 0 24px;
  overflow:hidden;
  font-family:var(--mono);
  font-size:14px;
  line-height:1.65;
  box-shadow:0 8px 24px rgba(0,0,0,.4);
}
.term-head{
  background:var(--bg-elev);
  padding:8px 14px;
  border-bottom:1px solid var(--line);
  display:flex;
  align-items:center;
  gap:10px;
  font-size:11px;
  letter-spacing:.15em;
  text-transform:uppercase;
  color:var(--ink-faint);
}
.term-dots{display:flex;gap:6px}
.term-dots span{width:10px;height:10px;border-radius:50%;display:inline-block}
.term-dots span:nth-child(1){background:#5a3a3a}
.term-dots span:nth-child(2){background:#5a4a2a}
.term-dots span:nth-child(3){background:#3a5a3a}
.term-title{flex:1;text-align:center}
.term-body{padding:18px 20px;color:var(--ink)}
.term-body .prompt{color:var(--green);user-select:none}
.term-body .prompt::after{content:" ";white-space:pre}
.term-body .cmd{color:var(--ink)}
.term-body .cmd .flag{color:var(--amber)}
.term-body .cmd .str{color:#d4a04a}
.term-body .out{color:var(--ink-dim);display:block;padding-left:18px}
.term-body .comment{color:var(--ink-faint);font-style:italic}
.term-line{display:block;padding:1px 0}
.term-line + .term-line.has-prompt{margin-top:6px}

/* Trick block special styling */
.block.trick-block{
  background:linear-gradient(180deg, rgba(255,176,0,.04), rgba(255,176,0,.01));
  border-left:3px solid var(--amber);
  padding:32px clamp(20px,3vw,40px);
  margin-left:-3px;
}

/* Divider ASCII */
.ascii-divider{
  text-align:center;
  font-family:var(--mono);
  font-size:14px;
  color:var(--ink-faint);
  letter-spacing:.4em;
  padding:40px 0 20px;
  user-select:none;
}

/* ============ FOOTER ============ */
.footer{
  padding:clamp(60px,8vw,100px) clamp(24px,5vw,80px) 40px;
  border-top:1px solid var(--line);
  background:var(--bg-elev);
}
.footer-content{
  max-width:1200px;
  margin:0 auto;
  display:flex;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:32px;
  align-items:flex-end;
}
.footer h3{
  font-family:var(--mono);
  font-weight:700;
  font-size:24px;
  letter-spacing:-.01em;
  margin-bottom:12px;
}
.footer p{color:var(--ink-dim);max-width:480px}
.footer .colophon{
  font-family:var(--mono);
  font-size:12px;
  color:var(--ink-faint);
  letter-spacing:.1em;
  text-transform:uppercase;
  text-align:right;
}
.footer-bottom{
  max-width:1200px;
  margin:60px auto 0;
  padding-top:24px;
  border-top:1px solid var(--line);
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--ink-faint);
  display:flex;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:16px;
}

/* Selection */
::selection{background:var(--amber);color:var(--bg)}

/* Anchor offset for sticky-ish feel */
.lesson{scroll-margin-top:20px}