/* ============================================================
   site.css  ·  Layer 2 layout + components
   Reads tokens.css. Contains: shared layout, top nav, the HERO
   and CENTERPIECE (ported verbatim from the locked prototype),
   the new main-scroll sections, and the two sub-pages.
   No design value is hardcoded that tokens.css already owns.
   ============================================================ */

*{box-sizing:border-box}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 var(--gutter)}

/* Section rhythm helpers (alternate ink / paper) */
.section{padding:clamp(4rem,12vh,8rem) 0}
.section-head{margin-bottom:clamp(2rem,6vh,3.5rem)}
.section-head .eyebrow{display:block;margin:0 0 .8rem}
.section-head h2{font-family:var(--font-display);font-weight:var(--weight-display);
  font-size:var(--fs-h2);line-height:1.05;letter-spacing:var(--tracking-display);margin:0;max-width:22ch}
.section-head p.lead{font-size:var(--fs-lead);max-width:60ch;margin:1.1rem 0 0;color:var(--text-muted)}
.section--ink .section-head p.lead{color:#C7CCD3}
/* Eyebrows are cobalt by default (fine on paper); on dark sections use the
   lighter cobalt so the small mono label stays legible on ink. */
.section--ink .eyebrow{color:var(--cobalt-light)}

/* Anchored sections clear the fixed nav when jumped to */
[id]{scroll-margin-top:5rem}

/* Buttons (non-hero CTAs; hero keeps its own .cta) */
.btn{display:inline-flex;gap:.55rem;align-items:center;font-family:var(--font-mono);
  font-size:var(--fs-mono);letter-spacing:.06em;text-transform:uppercase;text-decoration:none;
  padding:.8rem 1.25rem;border-radius:var(--radius);
  transition:transform .2s var(--ease-signal),background .2s,border-color .2s,color .2s}
.btn-primary{background:var(--cobalt);color:#fff}
.btn-primary:hover{transform:translateY(-2px)}
.btn-ghost{color:inherit;border:1px solid var(--line)}
.section--ink .btn-ghost{border-color:#3A414C}
.btn-ghost:hover{border-color:var(--cobalt);color:var(--cobalt)}
.btn[aria-disabled="true"]{opacity:.55;pointer-events:none}

/* Placeholder content the owner will write later (rendered as-is,
   but visibly marked so it never reads as a finished fact). */
.is-placeholder{color:var(--text-muted);font-style:italic}
.is-placeholder::after{content:" · placeholder";font-family:var(--font-mono);
  font-style:normal;font-size:.7em;letter-spacing:.08em;text-transform:uppercase;
  color:var(--mist);white-space:nowrap}

/* ============================================================
   Top navigation
   ============================================================ */
.nav{position:fixed;top:0;left:0;right:0;z-index:50;
  display:flex;align-items:center;justify-content:space-between;
  padding:.85rem var(--gutter);
  background:color-mix(in srgb,var(--ink) 82%,transparent);
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
  border-bottom:1px solid rgba(255,255,255,.06)}
.nav a{text-decoration:none}
.nav .brand{font-family:var(--font-display);font-weight:var(--weight-subhead);
  font-size:1rem;letter-spacing:-.01em;color:var(--text-on-ink)}
.nav .brand .blue{color:var(--cobalt)}
.nav ul{display:flex;gap:1.4rem;list-style:none;margin:0;padding:0}
.nav ul a{font-family:var(--font-mono);font-size:.75rem;letter-spacing:.08em;
  text-transform:uppercase;color:var(--mist)}
.nav ul a:hover,.nav ul a:focus-visible{color:var(--text-on-ink)}
@media (max-width:680px){.nav ul{display:none}}

/* ============================================================
   HERO  (locked — ported verbatim from prototype)
   ============================================================ */
/* Curtain reveal: the hero pins while the paper centerpiece below
   rises and covers it (see .cp). Nav stays fixed on top for contrast. */
.hero{position:sticky;top:0;z-index:0;background:var(--ink);color:var(--text-on-ink);
  min-height:100svh;display:flex;align-items:center;overflow:hidden}
.hero canvas{position:absolute;inset:0;width:100%;height:100%;opacity:.8}
.hero .wrap{position:relative;z-index:2}
.hero .eyebrow{color:var(--cobalt-light);margin:0 0 1.4rem}
.hero h1{font-family:var(--font-display);font-weight:800;
  font-size:clamp(2.75rem,8vw,5.25rem);line-height:1;letter-spacing:-.02em;margin:0}
.hero h1 .blue{color:var(--cobalt)}
.hero p.lead{max-width:46ch;font-size:clamp(1.05rem,2.2vw,1.35rem);
  line-height:1.5;color:#C7CCD3;margin:1.4rem 0 2.2rem}
.cta{display:inline-flex;gap:.55rem;align-items:center;font-family:var(--font-mono);
  font-size:.8125rem;letter-spacing:.06em;text-transform:uppercase;
  text-decoration:none;padding:.85rem 1.3rem;border-radius:4px;transition:transform .2s var(--ease-signal),background .2s}
.cta-primary{background:var(--cobalt);color:#fff}
.cta-primary:hover{transform:translateY(-2px)}
.cta-ghost{color:var(--text-on-ink);border:1px solid #3A414C;margin-left:.6rem}
.cta-ghost:hover{border-color:var(--cobalt)}
.scrollcue{position:absolute;left:50%;bottom:1.6rem;transform:translateX(-50%);z-index:2;
  font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.18em;text-transform:uppercase;color:var(--mist)}

/* hero load settle (noise -> signal) */
.settle{opacity:0;filter:blur(8px);transform:translateY(14px)}
.in .settle{opacity:1;filter:blur(0);transform:none;
  transition:opacity .7s var(--ease-signal),filter .7s var(--ease-signal),transform .7s var(--ease-signal)}
.in .d1{transition-delay:.05s}.in .d2{transition-delay:.18s}
.in .d3{transition-delay:.34s}.in .d4{transition-delay:.5s}

/* ============================================================
   CENTERPIECE  (locked — ported verbatim from prototype)
   ============================================================ */
/* Centerpiece is the curtain that rises over the pinned hero: it sits
   above the hero (z-index) with a rounded top lip and a soft top shadow. */
.cp{background:var(--paper);position:relative;z-index:1;
  border-radius:22px 22px 0 0;box-shadow:0 -1.5rem 3rem rgba(20,24,31,.22)}
.cp-scroll{position:relative;height:420vh}
.cp-sticky{position:sticky;top:0;height:100svh;display:flex;flex-direction:column;
  justify-content:center;overflow:hidden}
.cp-head{margin-bottom:clamp(1.2rem,4vh,2.6rem)}
.cp-head .eyebrow{color:var(--cobalt)}
.cp-head h2{font-family:var(--font-display);font-weight:800;font-size:clamp(1.8rem,4.5vw,3rem);
  line-height:1.04;letter-spacing:-.02em;margin:.5rem 0 0}
.cp-head h2 em{font-style:normal;color:var(--mist);transition:color .5s var(--ease-signal)}
.cp-sticky.lit .cp-head h2 em{color:var(--cobalt)}

/* pipeline */
.pipe{position:relative;display:flex;justify-content:space-between;gap:.5rem;margin:0 0 clamp(1.4rem,4vh,2.6rem)}
.track{position:absolute;left:6%;right:6%;top:11px;height:2px;background:var(--line)}
.fill{position:absolute;left:6%;width:88%;top:11px;height:2px;background:var(--cobalt);
  transform:scaleX(var(--p,0));transform-origin:left center;transition:transform .12s linear}
.node{position:relative;flex:1;display:flex;flex-direction:column;align-items:center;text-align:center;gap:.6rem;z-index:2}
.dot{width:24px;height:24px;border-radius:50%;background:var(--paper);
  border:2px solid var(--mist);transition:border-color .35s var(--ease-signal),background .35s}
.node.on .dot{border-color:var(--cobalt);background:var(--cobalt)}
.node.pulse .dot{animation:pulse .8s var(--ease-signal)}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(232,163,61,.85)}100%{box-shadow:0 0 0 16px rgba(232,163,61,0)}}
.node .nm{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.04em;line-height:1.3;
  color:var(--mist);max-width:14ch;transition:color .35s var(--ease-signal)}
.node.on .nm{color:var(--text-on-paper)}

/* detail */
.detail{min-height:142px;border-top:1px solid var(--line);padding-top:1.3rem}
.detail .step{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--amber);margin:0 0 .5rem}
.detail h3{font-family:var(--font-display);font-weight:600;font-size:1.5rem;letter-spacing:-.01em;margin:0 0 .7rem}
.detail .rows{display:grid;grid-template-columns:repeat(3,1fr);gap:1.1rem}
.detail .rows .lbl{font-family:var(--font-mono);font-size:.66rem;letter-spacing:.1em;text-transform:uppercase;color:var(--cobalt);margin:0 0 .25rem}
.detail .rows p{margin:0;font-size:.95rem;color:var(--text-on-paper)}
.fade{opacity:0;transform:translateY(8px)}
.fade.show{opacity:1;transform:none;transition:opacity .4s var(--ease-signal),transform .4s var(--ease-signal)}

/* static (reduced-motion) fallback */
.detail-all{display:none}
.static .cp-scroll{height:auto}
.static .cp-sticky{position:static;height:auto;padding:clamp(2rem,8vh,4rem) 0}
.static .fill{transform:scaleX(1)}
.static .node .dot{border-color:var(--cobalt);background:var(--cobalt)}
.static .node .nm{color:var(--text-on-paper)}
.static .detail{display:none}
.static .detail-all{display:block;border-top:1px solid var(--line);padding-top:1.6rem}
.static .da{padding:1.2rem 0;border-bottom:1px solid var(--line)}
.static .da h3{font-family:var(--font-display);font-weight:600;font-size:1.35rem;margin:.2rem 0 .8rem}

/* centerpiece — mobile: degrade the horizontal build to a vertical
   stepped sequence (ported verbatim from the locked prototype) */
@media (max-width:680px){
  .pipe{flex-direction:column;gap:1.4rem;align-items:flex-start}
  .track{left:11px;right:auto;top:0;bottom:0;width:2px;height:auto}
  .fill{left:11px;top:0;width:2px;height:100%;transform:scaleY(var(--p,0));transform-origin:top center}
  .node{flex-direction:row;align-items:center;text-align:left;width:100%}
  .node .nm{max-width:none}
  .detail .rows{grid-template-columns:1fr;gap:.9rem}
}

/* reduced motion — hero settle + node pulse off (the .reveal / .pulse
   primitives are already handled in tokens.css) */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .settle{opacity:1;filter:none;transform:none;transition:none}
  .node.pulse .dot{animation:none}
}

/* ============================================================
   TRACK RECORD  (telecom / ICT / industrial as reveal panels)
   ============================================================ */
.arc{font-size:var(--fs-lead);max-width:62ch;margin:0 0 clamp(2rem,5vh,3rem);color:#C7CCD3}
.panels{display:grid;gap:1.1rem}
.panel{position:relative;display:block;text-decoration:none;color:inherit;
  background:rgba(255,255,255,.03);border:1px solid rgba(255,255,255,.08);
  border-left:var(--rail-w) solid var(--mist);border-radius:var(--radius-card);
  padding:clamp(1.4rem,3vw,2rem);
  transition:border-color .35s var(--ease-signal),background .35s var(--ease-signal),transform .35s var(--ease-signal)}
a.panel:hover,a.panel:focus-visible{border-left-color:var(--cobalt);background:rgba(39,66,217,.08);transform:translateX(3px)}
.panel .pn-index{font-family:var(--font-mono);font-size:.75rem;letter-spacing:.1em;color:var(--mist)}
.panel h3{font-family:var(--font-display);font-weight:var(--weight-subhead);
  font-size:var(--fs-h3);letter-spacing:-.01em;margin:.5rem 0 .7rem}
.panel p{margin:0;color:#C7CCD3;max-width:64ch}
.panel .pn-link{display:inline-flex;align-items:center;gap:.4rem;margin-top:1rem;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:var(--cobalt)}
@media (min-width:760px){.panels{grid-template-columns:repeat(3,1fr)}.panel p{max-width:none}}

/* ============================================================
   PROOF OF AI FLUENCY  (annotated single-workflow walkthrough)
   ============================================================ */
.proof-grid{display:grid;gap:clamp(2rem,5vw,3.5rem)}
@media (min-width:860px){.proof-grid{grid-template-columns:1.1fr 1fr;align-items:start}}
.diff-line{font-family:var(--font-display);font-weight:var(--weight-subhead);
  font-size:var(--fs-h3);line-height:1.25;letter-spacing:-.01em;margin:0 0 1.2rem}
.proof-overview{font-size:var(--fs-lead);color:var(--text-muted);max-width:52ch}
.proof-meta{margin-top:1.6rem;display:flex;flex-wrap:wrap;gap:.5rem}
.chip{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.06em;
  padding:.4rem .7rem;border:1px solid var(--line);border-radius:999px;color:var(--text-muted)}
.chip.cert{border-color:var(--cobalt);color:var(--cobalt)}
a.chip{text-decoration:none;transition:background .2s}
a.chip.cert:hover,a.chip.cert:focus-visible{background:rgba(39,66,217,.08)}
.walk{list-style:none;margin:0;padding:0;border-left:var(--rail-w) solid var(--line)}
.walk li{position:relative;padding:0 0 1.6rem 1.6rem}
.walk li:last-child{padding-bottom:0}
.walk li::before{content:"";position:absolute;left:calc(-1 * var(--rail-w) - 5px);top:.35rem;
  width:12px;height:12px;border-radius:50%;background:var(--paper);border:2px solid var(--cobalt)}
.walk .w-step{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;color:var(--amber)}
.walk h4{font-family:var(--font-display);font-weight:var(--weight-subhead);font-size:1.2rem;margin:.3rem 0 .4rem}
.walk p{margin:.2rem 0 0;font-size:.95rem}
.walk .w-ai{color:var(--text-muted);font-size:.9rem}
.walk .w-ai b{font-family:var(--font-mono);font-weight:var(--weight-strong);font-size:.7rem;
  letter-spacing:.08em;text-transform:uppercase;color:var(--cobalt)}

/* ============================================================
   WRITING / SIGNAL
   ============================================================ */
/* Homepage preview + writing index share the .wi-card / .wi-grid components
   (defined under "writing index" below). */

/* ============================================================
   ABOUT + CONTACT
   ============================================================ */
.about-grid{display:grid;gap:clamp(2rem,5vw,3.5rem)}
@media (min-width:860px){.about-grid{grid-template-columns:1.3fr 1fr;align-items:start}}
.bio p{font-size:var(--fs-lead);max-width:62ch}
.bio p + p{margin-top:1rem}
.drives{margin-top:1.4rem;padding-left:1rem;border-left:2px solid var(--amber);color:var(--text-muted)}

.metrics{display:grid;grid-template-columns:repeat(2,1fr);gap:1.5rem 1rem;margin:0 0 2.5rem}
@media (min-width:560px){.metrics{grid-template-columns:repeat(3,1fr)}}
.metric .num{font-family:var(--font-display);font-weight:var(--weight-display);
  font-size:clamp(1.8rem,4vw,2.6rem);line-height:1;letter-spacing:-.02em;color:var(--cobalt)}
.metric .lbl{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.06em;
  text-transform:uppercase;color:var(--text-muted);margin-top:.4rem;display:block}

.contact-card{background:var(--ink);color:var(--text-on-ink);border-radius:var(--radius-card);
  padding:clamp(1.6rem,4vw,2.2rem)}
/* Inverted island on a light section: restate its text colour for the
   revealed state, or tokens' .reveal.is-in{color:inherit} pulls it dark. */
.contact-card.reveal.is-in{color:var(--text-on-ink)}
.contact-card h3{font-family:var(--font-display);font-weight:var(--weight-subhead);margin:0 0 1.2rem}
.contact-list{list-style:none;margin:0 0 1.6rem;padding:0;display:grid;gap:.9rem}
.contact-list .data-label{display:block;color:var(--mist);margin-bottom:.15rem}
.contact-list a{color:var(--text-on-ink);text-decoration:none;border-bottom:1px solid var(--cobalt)}
.contact-list a:hover{color:var(--cobalt)}

/* condensed experience timeline */
.timeline{list-style:none;margin:2.5rem 0 0;padding:0}
.timeline li{display:grid;gap:.2rem 1.2rem;padding:1.1rem 0;border-top:1px solid var(--line)}
@media (min-width:620px){.timeline li{grid-template-columns:14rem 1fr}}
.timeline .tl-when{font-family:var(--font-mono);font-size:.75rem;letter-spacing:.04em;color:var(--text-muted)}
.timeline .tl-role{font-weight:var(--weight-strong)}
.timeline .tl-org{color:var(--cobalt)}
.timeline .tl-embed{color:var(--text-muted);font-size:.9rem}

.skills-grid{display:grid;gap:1.4rem;margin-top:1rem}
@media (min-width:620px){.skills-grid{grid-template-columns:repeat(2,1fr)}}
.skills-grid .data-label{display:block;color:var(--cobalt);margin-bottom:.5rem}
.skills-grid ul{margin:0;padding:0;list-style:none;display:flex;flex-wrap:wrap;gap:.4rem}
.skills-grid li{font-size:.85rem;color:var(--text-muted);border:1px solid var(--line);
  border-radius:var(--radius);padding:.3rem .6rem}

/* AI fluency block (differentiation line + credentials) inside About */
.about-fluency{margin-top:2.2rem}
.about-fluency .data-label{display:block;color:var(--cobalt);margin-bottom:.7rem}
.fluency-line{font-family:var(--font-display);font-weight:var(--weight-subhead);
  font-size:1.2rem;line-height:1.4;letter-spacing:-.01em;margin:0 0 1.1rem;max-width:42ch}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer{background:var(--ink);color:var(--text-on-ink);padding:3rem 0;
  border-top:1px solid rgba(255,255,255,.08)}
.site-footer .wrap{display:flex;flex-wrap:wrap;gap:1rem;justify-content:space-between;align-items:center}
.site-footer .f-note{color:var(--mist);font-size:.9rem}
.site-footer nav{display:flex;gap:1.2rem;flex-wrap:wrap}
.site-footer nav a{font-family:var(--font-mono);font-size:.75rem;letter-spacing:.06em;
  text-transform:uppercase;color:var(--mist);text-decoration:none}
.site-footer nav a:hover{color:var(--text-on-ink)}

/* ============================================================
   SUB-PAGES  (case study + writing index)
   ============================================================ */
.subpage{padding-top:6rem}
.backlink{display:inline-flex;align-items:center;gap:.4rem;font-family:var(--font-mono);
  font-size:.75rem;letter-spacing:.06em;text-transform:uppercase;text-decoration:none;color:var(--text-muted)}
.backlink:hover{color:var(--cobalt)}
.confidential{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.05em;
  color:var(--text-muted);border:1px dashed var(--line);border-radius:var(--radius);
  padding:.6rem .9rem;margin:1.5rem 0 0;display:inline-block}

.cs-title{font-family:var(--font-display);font-weight:var(--weight-display);
  font-size:var(--fs-display);line-height:1.05;letter-spacing:var(--tracking-display);margin:1.5rem 0 .6rem;max-width:18ch}
.cs-context{font-size:var(--fs-lead);color:var(--text-muted)}
.cs-body{margin-top:clamp(2rem,5vh,3.5rem);display:grid;gap:2rem;max-width:70ch}
.cs-block .data-label{display:block;color:var(--cobalt);margin-bottom:.5rem}
.cs-block h2{font-family:var(--font-display);font-weight:var(--weight-subhead);font-size:1.4rem;margin:0 0 .6rem}
.cs-block p{margin:0;font-size:var(--fs-lead)}
.cs-skills{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:.5rem}
.cs-skills span{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.05em;
  border:1px solid var(--line);border-radius:999px;padding:.35rem .7rem;color:var(--text-muted)}
.cs-nav{margin-top:3rem;padding-top:1.5rem;border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;gap:1rem;justify-content:space-between}

/* ---- writing index: featured cover + card grid ---- */
.wi-index{margin:clamp(2rem,5vh,3rem) 0 0}
.wi-card{display:block;text-decoration:none;color:inherit;background:#fff;
  border:1px solid var(--line);border-radius:var(--radius-card);overflow:hidden;
  transition:transform .25s var(--ease-signal),box-shadow .25s var(--ease-signal),border-color .25s var(--ease-signal)}
a.wi-card:hover{transform:translateY(-4px);box-shadow:0 14px 34px rgba(20,24,31,.12);border-color:var(--cobalt)}
a.wi-card:focus-visible{outline:2px solid var(--cobalt);outline-offset:3px}
.wi-cover{aspect-ratio:16/9;background:var(--ink);overflow:hidden}
.wi-cover img{width:100%;height:100%;object-fit:cover;display:block}
.wi-body{padding:1.3rem 1.4rem 1.5rem}
.wi-meta{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;margin-bottom:.7rem;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.05em;color:var(--text-muted)}
.wi-tag{text-transform:uppercase;color:var(--cobalt);letter-spacing:.1em;
  border:1px solid var(--line);border-radius:100px;padding:.2rem .6rem}
.wi-dot{color:var(--mist)}
.wi-title{font-family:var(--font-display);font-weight:var(--weight-subhead);
  font-size:1.2rem;line-height:1.18;letter-spacing:-.01em;margin:0}
.wi-hook{color:var(--text-muted);margin:.5rem 0 0;max-width:60ch}

/* featured: the newest piece, larger, full width, cover on top */
.wi-featured{margin-bottom:1.6rem}
.wi-featured .wi-cover{max-height:400px}
.wi-featured .wi-body{padding:1.7rem 1.8rem 1.9rem}
.wi-featured .wi-title{font-size:clamp(1.6rem,3vw,2.2rem)}
.wi-featured .wi-hook{font-size:var(--fs-lead)}

/* the rest, in a responsive grid */
.wi-grid{display:grid;grid-template-columns:1fr;gap:1.4rem}
@media (min-width:600px){.wi-grid{grid-template-columns:repeat(2,1fr)}}
@media (min-width:940px){.wi-grid{grid-template-columns:repeat(3,1fr)}}

.empty-note{color:var(--text-muted);font-style:italic;margin-top:2rem}

/* ============================================================
   Cross-page "acquire signal" transition
   ============================================================ */
@view-transition { navigation: auto; }
::view-transition-old(root){ animation: vt-out .26s var(--ease-signal) both; }
::view-transition-new(root){ animation: vt-in .44s var(--ease-signal) both; }
@keyframes vt-out{ to{ opacity:0 } }
@keyframes vt-in{ from{ opacity:0; filter:blur(7px) } to{ opacity:1; filter:none } }
/* Browsers without cross-document view transitions get a gentle fade-in. */
@supports not (view-transition-name: none){
  @media (prefers-reduced-motion: no-preference){ body{ animation: page-in .45s var(--ease-signal) both } }
}
@keyframes page-in{ from{ opacity:0 } to{ opacity:1 } }
@media (prefers-reduced-motion: reduce){
  ::view-transition-old(root),::view-transition-new(root){ animation:none }
}

/* ============================================================
   Signal rail: scroll progress + section ticks (index only)
   ============================================================ */
.rail{position:fixed;top:0;right:max(14px,env(safe-area-inset-right));height:100vh;width:22px;z-index:40;
  display:flex;align-items:center;justify-content:center;pointer-events:none}
.rail-inner{position:relative;height:58vh;max-height:520px;width:100%}
.rail-track{position:absolute;left:50%;top:0;transform:translateX(-50%);width:var(--rail-w);height:100%;
  background:color-mix(in srgb,var(--mist) 45%,transparent);border-radius:2px}
.rail-fill{position:absolute;left:50%;top:0;transform:translateX(-50%) scaleY(var(--p,0));transform-origin:top center;
  width:var(--rail-w);height:100%;background:var(--cobalt);border-radius:2px;transition:transform .12s linear}
.rail-tick{position:absolute;left:50%;top:var(--y,0);transform:translate(-50%,-50%);
  width:7px;height:7px;border-radius:50%;background:var(--paper);border:1.5px solid var(--mist);
  pointer-events:auto;cursor:pointer;padding:0;
  transition:border-color .3s var(--ease-signal),background .3s,transform .3s}
.rail-tick::after{content:attr(data-label);position:absolute;right:16px;top:50%;transform:translateY(-50%);
  font-family:var(--font-mono);font-size:.62rem;letter-spacing:.1em;text-transform:uppercase;color:var(--text-muted);
  white-space:nowrap;opacity:0;transition:opacity .2s;
  background:color-mix(in srgb,var(--paper) 86%,transparent);padding:.15rem .4rem;border-radius:3px}
.rail:hover .rail-tick::after,.rail-tick:focus-visible::after{opacity:1}
.rail-tick.is-active{border-color:var(--cobalt);background:var(--cobalt);transform:translate(-50%,-50%) scale(1.3)}
.rail-tick.is-active::after{opacity:1;color:var(--cobalt)}
@media (max-width:760px){ .rail{display:none} }

/* active nav link */
.nav ul a.is-active{color:var(--text-on-ink);text-decoration:underline;
  text-decoration-color:var(--cobalt);text-underline-offset:5px}

/* tabular metric figures (so resolving counts do not jiggle width) */
.metric .num{font-variant-numeric:tabular-nums}