/* /heartwood/core/ — Take a core. The Heartwood vocabulary (bark ground,
   lamplight, Fraunces voice, JetBrains-Mono machine, ember for the one thing
   that matters), carried over from /heartwood/ so the two read as one lab. */
*{box-sizing:border-box;margin:0;padding:0}
body{background:var(--bark);color:var(--parchment);font-family:var(--serif);
  font-weight:360;font-size:17px;line-height:1.58;overflow-x:clip}
body::before{content:'';position:fixed;inset:0;pointer-events:none;z-index:50;opacity:.35;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.05 0'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E")}
.lamplight{position:fixed;inset:0;pointer-events:none;z-index:0;
  background:radial-gradient(ellipse 70% 38% at 50% -6%,rgba(232,166,74,.16),transparent 70%),
  radial-gradient(ellipse 45% 30% at 12% 110%,rgba(138,168,107,.05),transparent 70%)}
.wrap{max-width:1080px;margin:0 auto;padding:40px 28px 90px;position:relative;z-index:2}
a{color:var(--brass)}
a:hover{color:var(--ember)}

.crumb{font-family:var(--mono);font-size:10px;letter-spacing:.22em;text-transform:uppercase}
.crumb a{color:var(--faint);text-decoration:none}
.crumb a:hover{color:var(--brass)}
.eyebrow{font-family:var(--mono);font-size:11px;letter-spacing:.42em;
  text-transform:uppercase;color:var(--brass);display:flex;align-items:center;gap:12px;margin-top:30px}
.eyebrow::before,.eyebrow::after{content:"";flex:1;height:1px;background:var(--line)}
h1{font-style:italic;font-variation-settings:'opsz' 144;font-weight:380;
  font-size:clamp(46px,8.5vw,104px);line-height:.98;letter-spacing:-.015em;
  margin:24px 0 14px;text-align:center}
h1 em{color:var(--ember);font-style:italic}
.dek{text-align:center;color:var(--parchment-dim);font-style:italic;
  max-width:700px;margin:0 auto 8px;font-size:19px}
.dateline{font-family:var(--mono);font-size:10px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--faint);text-align:center;margin-top:16px}

.actnav{position:sticky;top:0;z-index:40;display:flex;gap:4px;justify-content:center;flex-wrap:nowrap;
  overflow-x:auto;scrollbar-width:none;padding:10px 6px;margin:26px -6px 0;
  background:linear-gradient(180deg,rgba(28,21,16,.92),rgba(28,21,16,.78));
  backdrop-filter:blur(6px);border-bottom:1px solid var(--line)}
.actnav::-webkit-scrollbar{display:none}
.actnav a{font-family:var(--mono);font-size:10px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--faint);text-decoration:none;padding:5px 11px;border-radius:6px;white-space:nowrap;
  border:1px solid transparent;transition:color .2s,border-color .2s}
.actnav a:hover{color:var(--gold)}
.actnav .rn{color:var(--brass);margin-right:5px;opacity:.7}
@media (max-width:640px){.actnav{justify-content:flex-start}}
.actlabel{font-family:var(--mono);font-size:10px;letter-spacing:.34em;text-transform:uppercase;
  color:var(--brass);opacity:.8;margin-bottom:8px}
section[id]{scroll-margin-top:64px}
h2{font-style:italic;font-weight:var(--weight-heading);font-size:var(--text-h2);margin-bottom:6px}
.sub{color:var(--parchment-dim);font-style:italic;font-size:15px;margin-bottom:18px;max-width:760px}
b{color:var(--parchment);font-weight:500}

/* ---- Fig 1, the borer ---- */
.bench{margin-top:34px}
.bench .iso-figure{margin:0}
.bench .iso-plate{border-radius:14px;background:linear-gradient(180deg,var(--panel),var(--bark-2));
  box-shadow:0 0 0 1px var(--line),0 30px 60px -30px rgba(0,0,0,.7)}
.bench .iso-legend{margin-top:16px;color:var(--parchment-dim);font-size:13px}
.bench .iso-caption{font-size:15px;line-height:1.7;color:var(--parchment-dim);max-width:760px}
.stages{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-top:16px}
.stages button{font-family:var(--mono);font-size:11px;letter-spacing:.06em;color:var(--parchment);
  background:var(--panel-2);border:1px solid var(--line);border-radius:7px;min-height:40px;
  padding:9px 14px;cursor:pointer;transition:border-color .2s,color .2s}
.stages button:hover{border-color:var(--brass);color:var(--gold)}
.stages button.on{border-color:var(--ember);color:var(--ember)}
.stages button:focus-visible{outline:2px solid var(--ember);outline-offset:3px}
.stages .rn{color:var(--brass);margin-right:6px}
.truth{border-left:2px solid var(--ember);padding:12px 0 12px 18px;margin-top:22px;max-width:760px;
  font-style:italic;color:var(--faint);font-size:15px;line-height:1.65}
.truth::before{content:"❦ ";color:var(--ember);font-style:normal}

/* ---- the kit ---- */
.kit{margin-top:72px}
.kitlist{list-style:none;display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px;margin-top:8px}
.kitlist li{background:linear-gradient(180deg,var(--panel),var(--bark-2));border:1px solid var(--line);
  border-radius:12px;padding:14px 16px}
.kitlist .tag{display:block;font-family:var(--mono);font-size:10px;letter-spacing:.2em;text-transform:uppercase;
  color:var(--brass);margin-bottom:6px}
.kitlist b{display:block;font-style:italic;font-weight:500;color:var(--gold);font-size:16.5px;margin-bottom:4px}
.kitlist p{color:var(--parchment-dim);font-size:14px;line-height:1.6}

/* ---- the steps ---- */
.steps{margin-top:72px}
.steplist{list-style:none;counter-reset:st;margin-top:10px;max-width:820px}
.steplist>li{counter-increment:st;display:grid;grid-template-columns:52px 1fr;gap:18px;
  padding:22px 0;border-bottom:1px solid var(--line)}
.steplist>li:last-child{border-bottom:none}
.steplist>li::before{content:counter(st,upper-roman);font-family:var(--mono);font-size:19px;color:var(--ember);
  opacity:.9;padding-top:4px;text-align:right}
.steplist h3{font-family:var(--serif);font-style:italic;font-weight:500;font-size:21px;color:var(--parchment);margin-bottom:6px}
.steplist p{color:var(--parchment-dim);font-size:15.5px;line-height:1.68;margin-bottom:10px}
.steplist .why,.steplist .wrongway{font-size:14px;line-height:1.6;padding:9px 12px;border-radius:8px;margin:8px 0 0}
.steplist .why{background:rgba(138,168,107,.07);border:1px solid rgba(138,168,107,.22);color:var(--parchment-dim)}
.steplist .wrongway{background:rgba(196,116,74,.07);border:1px solid rgba(196,116,74,.25);color:var(--parchment-dim)}
.steplist .why::before,.steplist .wrongway::before{font-family:var(--mono);font-size:10px;letter-spacing:.2em;
  text-transform:uppercase;display:block;margin-bottom:3px}
.steplist .why::before{content:"why";color:var(--moss)}
.steplist .wrongway::before{content:"where it goes wrong";color:#d4997a}

/* dot notation, drawn to scale-ish in CSS: one dot a decade, two at fifty, three a century */
.dots{margin:14px 0 4px;padding:14px 16px 12px;background:var(--panel-2);border:1px solid var(--line);border-radius:10px}
.dotcore{position:relative;height:22px;border-radius:4px;
  background:repeating-linear-gradient(90deg,#c9a26a 0,#c9a26a 1.55%,#6b4a2c 1.55%,#6b4a2c 2.0833%)}
.dotcore i{position:absolute;top:50%;transform:translate(-50%,-50%);display:flex;flex-direction:column;gap:2px}
.dotcore span{display:block;width:4px;height:4px;border-radius:50%;background:#1a120b}
.dotcore .yr0{position:absolute;bottom:-17px;transform:translateX(-50%);font-family:var(--mono);font-size:9.5px;color:var(--faint);font-style:normal}
.dotcore .yr0.lo{left:0;transform:none}
.dotcore .yr0.hi{left:auto;right:0;transform:none}
.dots p{margin:24px 0 0;font-family:var(--mono);font-size:10.5px;color:var(--faint);letter-spacing:.05em;line-height:1.6}

/* ---- trouble + the tree ---- */
.trouble{margin-top:72px;max-width:820px}
.trouble ol{list-style:none;counter-reset:wr;margin-top:8px}
.trouble li{counter-increment:wr;display:grid;grid-template-columns:44px 1fr;gap:16px;padding:16px 0;border-bottom:1px solid var(--line)}
.trouble li:last-child{border-bottom:none}
.trouble li::before{content:counter(wr,decimal-leading-zero);font-family:var(--mono);font-size:20px;color:var(--ember);opacity:.85;padding-top:2px}
.trouble li b{display:block;font-style:italic;margin-bottom:4px}
.trouble li p{color:var(--parchment-dim);font-size:15px;line-height:1.62}

.notes{margin-top:72px}
.notegrid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-top:8px}
@media (max-width:760px){.notegrid{grid-template-columns:1fr}}
.note{background:linear-gradient(180deg,var(--panel),var(--bark-2));border:1px solid var(--line);
  border-radius:12px;padding:18px 20px}
.note h3{font-family:var(--serif);font-style:italic;font-weight:500;font-size:17.5px;color:var(--gold);margin:0 0 8px}
.note p{color:var(--parchment-dim);font-size:14.5px;line-height:1.65}

/* ---- the tool's own rings ---- */
.lineage{margin-top:72px}
.timeline{list-style:none;margin-top:26px;border-left:1px solid var(--line);max-width:820px}
.timeline li{display:grid;grid-template-columns:96px 1fr;gap:18px;padding:13px 0 13px 22px;position:relative}
.timeline li::before{content:'';position:absolute;left:-4px;top:22px;width:7px;height:7px;border-radius:50%;
  border:1px solid var(--brass);background:var(--bark)}
.timeline li.mark::before{border-color:var(--ember);background:#2a1d12}
.timeline .yr{font-family:var(--mono);font-size:12px;letter-spacing:.08em;color:var(--brass);padding-top:2px}
.timeline p{color:var(--parchment-dim);font-size:15.5px;line-height:1.6}
@media (max-width:560px){.timeline li{grid-template-columns:1fr;gap:4px}}

/* ---- hand-off back to the instrument ---- */
.handoff{margin-top:72px;padding:26px 24px;border:1px solid rgba(232,131,58,.35);border-radius:14px;
  background:linear-gradient(180deg,#2a1d12,var(--bark-2));text-align:center}
.handoff p{color:var(--parchment-dim);font-style:italic;max-width:640px;margin:0 auto 14px}
.handoff a{display:inline-block;font-family:var(--mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;
  color:var(--ember);text-decoration:none;border:1px solid rgba(232,131,58,.45);border-radius:7px;padding:11px 16px;margin:4px}
.handoff a:hover{border-color:var(--ember);color:var(--gold)}

.foot{margin-top:64px;text-align:center;font-family:var(--mono);font-size:11px;
  letter-spacing:.06em;color:var(--faint);display:flex;flex-wrap:wrap;gap:14px;justify-content:center}
.foot a{text-decoration:none}

@media (max-width:560px){
  .wrap{padding:28px 16px 70px}
  .steplist>li{grid-template-columns:34px 1fr;gap:12px}
  .steplist>li::before{font-size:15px}
}