/* ═══════════════════════════════════════════════════════════════
   yiting.ie — single-origin, no webfonts, no third-party requests.
   Dark-committed: the detection stills and Kibana maps sit in dark
   surfaces naturally, and document pages get their own light sheet.
   ═══════════════════════════════════════════════════════════════ */

:root{
  --bg:#0b0d10;
  --surface:#12161b;
  --surface-2:#171c23;
  --line:#232a33;
  --line-soft:#1b212a;
  --text:#e6e9ed;
  --muted:#98a2ae;
  --faint:#6b7683;
  --accent:#64d2c7;
  --accent-dim:#2f9e94;

  --sans:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",
         "Noto Sans","Noto Sans CJK SC","PingFang SC","Microsoft YaHei",Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;

  --wrap:1140px;
  --pad:clamp(1.25rem,4vw,2.5rem);
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{animation:none!important;transition:none!important}
}

body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img,video,svg{max-width:100%;height:auto;display:block}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:3px}
code{font-family:var(--mono);font-size:.88em;background:var(--surface-2);
     padding:.1em .35em;border-radius:4px;color:var(--accent)}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:3px}

.wrap{max-width:var(--wrap);margin-inline:auto;padding-inline:var(--pad)}

.skip{position:absolute;left:-9999px;top:0;background:var(--accent);color:#04100e;
      padding:.7rem 1.1rem;z-index:200;border-radius:0 0 6px 0}
.skip:focus{left:0}

/* ───────────────────────────  top bar  ─────────────────────── */
.topbar{
  position:sticky;top:0;z-index:80;
  display:flex;align-items:center;justify-content:space-between;gap:1rem;
  padding:.85rem var(--pad);
  background:rgba(11,13,16,.82);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line-soft);
}
.wordmark{color:var(--text);font-weight:600;letter-spacing:-.02em;font-size:1.02rem}
.wordmark:hover{text-decoration:none}
.wordmark span{color:var(--accent)}
.topbar nav{display:flex;align-items:center;gap:clamp(.8rem,2.2vw,1.7rem)}
.topbar nav a{color:var(--muted);font-size:.9rem}
.topbar nav a:hover{color:var(--text);text-decoration:none}
@media (max-width:700px){
  .topbar nav a:not(.btn-sm){display:none}
}

.btn,.btn-sm{
  display:inline-block;border:1px solid var(--accent);border-radius:7px;
  background:var(--accent);color:#04100e;font-weight:600;font-family:inherit;
  cursor:pointer;text-align:center;line-height:1.35;
}
.btn{padding:.72rem 1.3rem;font-size:.95rem}
.btn-sm{padding:.38rem .78rem;font-size:.83rem}
.btn:hover,.btn-sm:hover{background:var(--accent-dim);border-color:var(--accent-dim);
  color:#fff;text-decoration:none}
.btn.ghost{background:transparent;color:var(--accent)}
.btn.ghost:hover{background:rgba(100,210,199,.1);color:var(--accent)}
.btn-note{display:block;font-weight:400;font-size:.72rem;opacity:.72;margin-top:.1rem}

/* ─────────────────────────────  hero  ──────────────────────── */
.hero{padding:clamp(4rem,11vh,7.5rem) 0 clamp(3rem,7vh,5rem)}
.eyebrow{
  font-family:var(--mono);font-size:.78rem;letter-spacing:.14em;
  text-transform:uppercase;color:var(--accent);margin:0 0 1.6rem;
}
.hero h1{
  margin:0 0 1.8rem;
  font-size:clamp(2.1rem,6.2vw,4.05rem);
  line-height:1.08;letter-spacing:-.032em;font-weight:650;
}
.hero h1 em{font-style:normal;color:var(--accent)}
@media (max-width:620px){ .hero h1 br{display:none} }

.lede{
  max-width:62ch;margin:0 0 2rem;
  font-size:clamp(1rem,1.9vw,1.16rem);color:var(--muted);
}
.chips{list-style:none;display:flex;flex-wrap:wrap;gap:.55rem;margin:0 0 2.3rem;padding:0}
.chips li{
  font-family:var(--mono);font-size:.78rem;color:var(--muted);
  border:1px solid var(--line);border-radius:100px;padding:.34rem .85rem;
  background:var(--surface);
}
.cta{display:flex;flex-wrap:wrap;gap:.8rem}

/* ───────────────────────  capabilities  ────────────────────── */
.band{border-block:1px solid var(--line-soft);background:var(--surface);
      padding:clamp(2.5rem,6vw,3.5rem) 0}
.caps{display:grid;gap:1px;background:var(--line-soft);
      grid-template-columns:repeat(auto-fit,minmax(235px,1fr));
      border:1px solid var(--line-soft);border-radius:10px;overflow:hidden}
.caps article{background:var(--surface);padding:1.5rem 1.4rem}
.caps h3{
  margin:0 0 .6rem;font-size:.8rem;font-family:var(--mono);
  letter-spacing:.1em;text-transform:uppercase;color:var(--accent);font-weight:600;
}
.caps p{margin:0;font-size:.91rem;color:var(--muted);line-height:1.6}

/* ────────────────────────  sections  ───────────────────────── */
.section{padding:clamp(3.5rem,9vw,6rem) 0}
.section.alt{background:var(--surface);border-block:1px solid var(--line-soft)}
.sec-title{
  display:flex;align-items:baseline;gap:.9rem;margin:0 0 .6rem;
  font-size:clamp(1.5rem,3.4vw,2.1rem);letter-spacing:-.025em;font-weight:620;
}
.sec-title .num{font-family:var(--mono);font-size:.8rem;color:var(--accent);
  letter-spacing:.1em;font-weight:500}
.sec-note{margin:0 0 clamp(2.2rem,5vw,3.2rem);color:var(--faint);max-width:62ch;font-size:.95rem}

/* ─────────────────────────  case study  ────────────────────── */
.case{
  display:grid;gap:clamp(1.6rem,4vw,3.2rem);align-items:start;
  grid-template-columns:minmax(0,1fr) minmax(0,1fr);
  padding-block:clamp(2.2rem,5vw,3.4rem);
  border-top:1px solid var(--line-soft);
}
.case:first-of-type{border-top:0;padding-top:0}
@media (max-width:900px){
  .case{grid-template-columns:1fr}
  .case.reverse .case-media{order:-1}
}
@media (min-width:901px){
  .case.reverse .case-media{order:2}
}
/* stills are 637–640px native: never upscale them past legibility */
.case-media{position:sticky;top:5.5rem}
@media (max-width:900px){ .case-media{position:static} }
.case-media figure{margin:0}
.case-media img{
  width:100%;max-width:620px;border-radius:9px;
  border:1px solid var(--line);background:#000;
}
.case-media figcaption{
  margin-top:.85rem;font-size:.83rem;line-height:1.55;color:var(--faint);max-width:620px;
}
.case-media figcaption code{font-size:.85em}
.under-media{margin:.8rem 0 0;font-family:var(--mono);font-size:.75rem;color:var(--faint);text-align:center}

.zoom{
  display:block;position:relative;padding:0;border:0;background:none;
  cursor:zoom-in;width:100%;max-width:620px;margin-bottom:.9rem;
}
.zoom:last-of-type{margin-bottom:0}
.zoom-hint{
  position:absolute;right:.6rem;bottom:.6rem;
  font-family:var(--mono);font-size:.68rem;letter-spacing:.08em;text-transform:uppercase;
  background:rgba(11,13,16,.8);color:var(--text);border:1px solid var(--line);
  padding:.26rem .6rem;border-radius:5px;opacity:0;transition:opacity .18s;
}
.zoom:hover .zoom-hint,.zoom:focus-visible .zoom-hint{opacity:1}

.case-meta{
  margin:0 0 .55rem;font-family:var(--mono);font-size:.74rem;letter-spacing:.09em;
  text-transform:uppercase;color:var(--faint);
}
.case-body h3{margin:0 0 .9rem;font-size:clamp(1.22rem,2.6vw,1.6rem);
  letter-spacing:-.022em;line-height:1.25;font-weight:620}
.case-body p{margin:0 0 1rem;color:var(--muted);font-size:.97rem}
.case-body strong{color:var(--text);font-weight:600}
.case-caveat{font-size:.85rem!important;color:var(--faint)!important;
  border-left:2px solid var(--line);padding-left:.85rem}

/* compression figure */
.fig-compress{background:var(--surface-2);border:1px solid var(--line);
  border-radius:9px;padding:1.2rem;max-width:620px}
.fig-compress svg{width:100%}
.svg-num{font-family:var(--mono);fill:var(--text);font-weight:600}
.svg-num.big{font-size:34px}
.svg-num.sm{font-size:34px;fill:var(--accent)}
.svg-unit{font-family:var(--mono);font-size:14px;fill:var(--faint)}
.svg-cap{font-family:var(--mono);font-size:12px;fill:var(--faint);letter-spacing:.08em;text-transform:uppercase}

/* phone frame for the portrait screen recording */
.phone{
  max-width:310px;margin-inline:auto;padding:9px;
  background:linear-gradient(160deg,#2a323c,#171c23);
  border:1px solid var(--line);border-radius:34px;
  box-shadow:0 22px 50px -18px rgba(0,0,0,.85);
}
.phone video{width:100%;border-radius:26px;display:block;background:#000}

/* ────────────────────────  research  ───────────────────────── */
.docs{display:grid;gap:1.3rem;grid-template-columns:repeat(auto-fit,minmax(330px,1fr))}
.doc{background:var(--bg);border:1px solid var(--line);border-radius:11px;
     padding:clamp(1.4rem,3vw,1.9rem);display:flex;flex-direction:column}
.doc-kind{margin:0 0 .8rem;font-family:var(--mono);font-size:.72rem;letter-spacing:.1em;
  text-transform:uppercase;color:var(--accent)}
.doc h3{margin:0 0 .9rem;font-size:1.12rem;line-height:1.35;letter-spacing:-.015em;font-weight:620}
.doc-ref{margin:0 0 1rem;font-size:.85rem;color:var(--faint);line-height:1.6}
.doc p{color:var(--muted);font-size:.93rem;margin:0 0 1rem}
.doc-actions{display:flex;flex-wrap:wrap;gap:.65rem;margin-top:auto;padding-top:.6rem}

/* ───────────────────────  experience  ──────────────────────── */
.timeline{list-style:none;margin:0 0 3.5rem;padding:0;border-left:1px solid var(--line)}
.timeline li{position:relative;padding:0 0 2.1rem 1.7rem}
.timeline li::before{
  content:"";position:absolute;left:-4.5px;top:.62rem;width:8px;height:8px;
  border-radius:50%;background:var(--accent);box-shadow:0 0 0 4px var(--bg);
}
.timeline li:last-child{padding-bottom:0}
.tl-when{margin:0 0 .3rem;font-family:var(--mono);font-size:.74rem;letter-spacing:.08em;color:var(--faint)}
.timeline h3{margin:0 0 .5rem;font-size:1.06rem;font-weight:620;letter-spacing:-.012em}
.timeline h3 span{display:block;font-weight:400;font-size:.88rem;color:var(--faint);
  letter-spacing:0;margin-top:.15rem}
.timeline p:last-child{margin:0;color:var(--muted);font-size:.94rem}

.edu{border-top:1px solid var(--line-soft);padding-top:2rem}
.edu h3{margin:0 0 1rem;font-family:var(--mono);font-size:.78rem;letter-spacing:.11em;
  text-transform:uppercase;color:var(--accent);font-weight:600}
.edu p{margin:0 0 .55rem;font-size:.94rem;color:var(--muted)}
.edu strong{color:var(--text);font-weight:600}
.edu-lang{margin-top:1.1rem!important;font-size:.87rem!important;color:var(--faint)!important}

/* ────────────────────────  contact  ────────────────────────── */
.contact{background:var(--surface);border-top:1px solid var(--line-soft)}
.contact-lede{margin:0 0 2.4rem;font-size:clamp(1.05rem,2.2vw,1.25rem);max-width:52ch}
.contact-grid{display:grid;gap:1.8rem;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
  margin-bottom:2.6rem}
.contact-grid .k{margin:0 0 .35rem;font-family:var(--mono);font-size:.72rem;letter-spacing:.1em;
  text-transform:uppercase;color:var(--faint)}
.contact-grid .v{margin:0;font-size:.96rem;color:var(--muted);line-height:1.6}
.contact-cv{margin:0}

/* ─────────────────────────  footer  ────────────────────────── */
footer{border-top:1px solid var(--line-soft);padding:2.2rem 0;background:var(--bg)}
footer p{margin:0;font-size:.84rem;color:var(--faint)}
.colophon{margin-top:.4rem!important;font-family:var(--mono);font-size:.75rem!important}

/* ───────────────────────  lightbox  ────────────────────────── */
.lightbox{
  position:fixed;inset:0;z-index:150;display:grid;place-items:center;
  background:rgba(6,8,10,.94);padding:clamp(1rem,4vw,3rem);
}
.lightbox[hidden]{display:none}
.lightbox figure{margin:0;max-width:min(1300px,100%);max-height:100%;
  display:flex;flex-direction:column;gap:.9rem}
.lightbox img{max-width:100%;max-height:78vh;object-fit:contain;
  border-radius:8px;border:1px solid var(--line);margin-inline:auto}
.lightbox figcaption{text-align:center;font-size:.86rem;color:var(--muted)}
.lb-close{
  position:absolute;top:1rem;right:1rem;width:42px;height:42px;border-radius:8px;
  background:var(--surface);border:1px solid var(--line);color:var(--text);
  font-size:1.1rem;cursor:pointer;line-height:1;
}
.lb-close:hover{background:var(--surface-2)}

/* ────────────────────  document reader  ────────────────────── */
.reader{position:fixed;inset:0;z-index:160;background:#0e1114;
  display:flex;flex-direction:column}
.reader[hidden]{display:none}
.reader-bar{
  display:flex;align-items:center;gap:.9rem;flex-shrink:0;
  padding:.7rem clamp(.8rem,3vw,1.4rem);
  background:var(--surface);border-bottom:1px solid var(--line);
}
.reader-title{
  margin:0;flex:1;min-width:0;font-size:.9rem;font-weight:600;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.reader-pos{margin:0;font-family:var(--mono);font-size:.8rem;color:var(--faint);
  white-space:nowrap;flex-shrink:0}
#reader-close{background:transparent;color:var(--muted);border-color:var(--line)}
#reader-close:hover{background:var(--surface-2);color:var(--text);border-color:var(--line)}
.reader-pages{
  flex:1;overflow-y:auto;overscroll-behavior:contain;
  padding:clamp(.8rem,3vw,2rem) clamp(.5rem,3vw,2rem) 4rem;
  scroll-padding-top:1rem;
}
.reader-pages .pg{
  position:relative;width:100%;max-width:900px;margin:0 auto 1.1rem;
  aspect-ratio:1000/1414;background:#f4f4f2;border-radius:3px;
  box-shadow:0 6px 26px -10px rgba(0,0,0,.75);overflow:hidden;
}
.reader-pages .pg img{width:100%;height:100%;object-fit:contain;display:block}
.reader-pages .pg::after{
  content:attr(data-n);position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  font-family:var(--mono);font-size:.8rem;color:#a9adb2;
}
.reader-pages .pg.loaded::after{content:none}
@media (max-width:640px){
  .reader-title{font-size:.8rem}
  .reader-pos{display:none}
}