:root{
  --bg:#F6F6F3;
  --surface:#FFFFFF;
  --surface-2:#EDEEEA;
  --ink:#16191B;
  --ink-2:#414A4D;
  --muted:#717A7D;
  --rule:#DEDFDA;
  --accent:#0E4F4A;
  --accent-soft:#E4EEEC;
  --brass:#77706A;
  --shadow:none;

  --f-display:"Source Serif 4",Georgia,"Times New Roman",serif;
  --f-sans:"IBM Plex Sans","IBM Plex Sans Thai",system-ui,-apple-system,"Segoe UI",sans-serif;
  --f-th:"IBM Plex Sans Thai","IBM Plex Sans",system-ui,sans-serif;
  --f-zh:"Noto Sans SC","IBM Plex Sans",system-ui,sans-serif;
  --f-mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,monospace;

  --maxw:1160px;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#101314;
    --surface:#171B1C;
    --surface-2:#1E2324;
    --ink:#E8EBEA;
    --ink-2:#B4BCBC;
    --muted:#8B9494;
    --rule:#2A3132;
    --accent:#63B9AE;
    --accent-soft:#182B29;
    --brass:#9A938C;
    --shadow:none;
  }
}
:root[data-theme="dark"]{
  --bg:#101314;
  --surface:#171B1C;
  --surface-2:#1E2324;
  --ink:#E8EBEA;
  --ink-2:#B4BCBC;
  --muted:#8B9494;
  --rule:#2A3132;
  --accent:#63B9AE;
  --accent-soft:#182B29;
  --brass:#9A938C;
  --shadow:none;
}

*{box-sizing:border-box}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--f-sans);
  font-size:16px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%}
a{color:inherit}
::selection{background:var(--accent);color:var(--bg)}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:3px}

/* ---------- language switching ---------- */
:root:not([data-lang]) .l:not(.en),
[data-lang="th"] .l:not(.th),
[data-lang="en"] .l:not(.en),
[data-lang="zh"] .l:not(.zh){display:none !important}
.th{font-family:var(--f-th)}
.zh{font-family:var(--f-zh)}

/* ---------- shell ---------- */
.wrap{
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 24px 96px;
  display:grid;
  grid-template-columns:300px minmax(0,1fr);
  gap:0 72px;
  align-items:start;
}

/* ---------- left rail ---------- */
.rail{
  position:sticky;
  top:0;
  padding:48px 0 40px;
  display:flex;
  flex-direction:column;
  gap:26px;
}
.name{
  font-family:var(--f-display);
  font-weight:600;
  font-size:clamp(28px,3.4vw,34px);
  line-height:1.1;
  letter-spacing:-.015em;
  margin:0;
  text-wrap:balance;
}
.name .surname{display:block;color:var(--ink-2);font-weight:500}
.role{
  font-family:var(--f-mono);
  font-size:11.5px;
  letter-spacing:.11em;
  text-transform:uppercase;
  color:var(--accent);
  margin-top:10px;
  line-height:1.7;
}
.role.th,.role.zh{font-family:var(--f-th);letter-spacing:.04em;font-size:12.5px}
.role.zh{font-family:var(--f-zh)}

.langbar{display:flex;gap:0;border:1px solid var(--rule);width:fit-content;background:var(--surface)}
.langbar button{
  appearance:none;border:0;background:transparent;cursor:pointer;
  font-family:var(--f-mono);font-size:12px;letter-spacing:.06em;
  padding:8px 13px;color:var(--muted);
  border-right:1px solid var(--rule);
  transition:background .15s ease,color .15s ease;
}
.langbar button:last-child{border-right:0;font-family:var(--f-zh);letter-spacing:.04em}
.langbar button:hover{color:var(--ink);background:var(--surface-2)}
.langbar button[aria-pressed="true"]{background:var(--accent);color:var(--surface)}
.langbar button[aria-pressed="true"]{color:#fff}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .langbar button[aria-pressed="true"]{color:#0D1614}}
:root[data-theme="dark"] .langbar button[aria-pressed="true"]{color:#0D1614}

.railnav{display:flex;flex-direction:column;gap:2px;border-top:1px solid var(--rule);padding-top:18px}
.railnav a{
  text-decoration:none;color:var(--muted);
  font-size:14px;padding:3px 0;
  display:flex;align-items:baseline;gap:10px;
  transition:color .15s ease;
}
.railnav a:hover{color:var(--accent)}
.railnav a span.num{font-family:var(--f-mono);font-size:10.5px;color:var(--muted);opacity:.6}
.railnav a:hover span.num{color:var(--accent)}

.railcontact{border-top:1px solid var(--rule);padding-top:18px;display:flex;flex-direction:column;gap:7px;font-size:13.5px}
.railcontact a{color:var(--ink-2);text-decoration:none;display:flex;gap:9px;align-items:center;transition:color .15s}
.railcontact a:hover{color:var(--accent)}
.railcontact .k{font-family:var(--f-mono);font-size:10px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);min-width:62px}

/* ---------- main ---------- */
main{padding:48px 0 0;min-width:0}

.hero{border-bottom:1px solid var(--rule);padding-bottom:52px}
.eyebrow{
  font-family:var(--f-mono);
  font-size:11px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--muted);
  display:flex;align-items:center;gap:10px;margin-bottom:22px;
}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--brass)}
.eyebrow.th,.eyebrow.zh{text-transform:none;letter-spacing:.05em;font-size:12px}
.eyebrow.th{font-family:var(--f-th)}
.eyebrow.zh{font-family:var(--f-zh)}

h1.thesis{
  font-family:var(--f-display);
  font-weight:600;
  font-size:clamp(29px,3.9vw,42px);
  line-height:1.15;
  letter-spacing:-.015em;
  margin:0 0 24px;
  text-wrap:balance;
  max-width:20ch;
}
h1.thesis .th{font-family:var(--f-th);font-weight:600;line-height:1.28;letter-spacing:0;font-size:.86em}
h1.thesis .zh{font-family:var(--f-zh);font-weight:700;line-height:1.3;letter-spacing:.01em}
h1.thesis .accent{color:var(--accent)}

.lede{font-size:17.5px;line-height:1.72;color:var(--ink-2);max-width:60ch;margin:0}
.lede .th{font-size:16.5px;line-height:1.85}
.lede .zh{line-height:1.9}

.stats{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  border:1px solid var(--rule);
  background:var(--surface);
  margin:44px 0 0;
}
.stat{padding:18px 20px;border-right:1px solid var(--rule)}
.stat:last-child{border-right:0}
.stat .v{
  font-family:var(--f-display);font-weight:700;
  font-size:30px;line-height:1;letter-spacing:-.02em;
  font-variant-numeric:tabular-nums;
  color:var(--ink);
}
.stat .k{
  font-family:var(--f-mono);font-size:10.5px;letter-spacing:.09em;
  text-transform:uppercase;color:var(--muted);margin-top:9px;line-height:1.5;
}
.stat .k.th{font-family:var(--f-th);text-transform:none;letter-spacing:0;font-size:12.5px}
.stat .k.zh{font-family:var(--f-zh);text-transform:none;letter-spacing:0;font-size:12.5px}

section.block{padding:74px 0 0;scroll-margin-top:24px}
.sect-head{display:flex;align-items:baseline;gap:14px;margin-bottom:24px}
.sect-num{font-family:var(--f-mono);font-size:11px;color:var(--brass);letter-spacing:.1em}
.sect-title{
  font-family:var(--f-display);font-weight:600;
  font-size:clamp(22px,2.6vw,27px);letter-spacing:-.01em;margin:0;line-height:1.2;
}
.sect-title .th{font-family:var(--f-th);font-weight:600}
.sect-title .zh{font-family:var(--f-zh);font-weight:700}
.sect-rule{flex:1;height:1px;background:var(--rule);min-width:20px}

.prose{font-size:16.5px;line-height:1.78;color:var(--ink-2);max-width:64ch}
.prose .th{line-height:1.9}
.prose .zh{line-height:1.95}
.prose p{margin:0 0 16px}
.prose p:last-child{margin-bottom:0}
.prose strong{color:var(--ink);font-weight:600}

/* build cards */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:16px;margin-top:6px}
.card{
  background:var(--surface);
  border:1px solid var(--rule);
  padding:22px 22px 24px;
  display:flex;flex-direction:column;gap:11px;
}
.card h3{
  font-family:var(--f-display);font-weight:600;font-size:19px;margin:0;line-height:1.25;color:var(--ink);
}
.card h3 .th{font-family:var(--f-th)}
.card h3 .zh{font-family:var(--f-zh)}
.card p{margin:0;font-size:14.5px;line-height:1.72;color:var(--ink-2)}
.card p .th,.card p .zh{line-height:1.85}
.card .tools{display:flex;flex-wrap:wrap;gap:6px;margin-top:auto;padding-top:6px}
.tag{
  font-family:var(--f-mono);font-size:10.5px;letter-spacing:.05em;
  padding:3px 8px;border:1px solid var(--rule);color:var(--muted);
  border-radius:2px;white-space:nowrap;
}

/* timeline */
.path{position:relative;margin-top:4px;padding-left:26px}
.path::before{content:"";position:absolute;left:5px;top:8px;bottom:8px;width:1px;background:var(--rule)}
.step{position:relative;padding:0 0 26px}
.step:last-child{padding-bottom:0}
.step::before{
  content:"";position:absolute;left:-25px;top:8px;width:11px;height:11px;
  border-radius:50%;background:var(--bg);border:1.5px solid var(--rule);
}
.step.current::before{background:var(--accent);border-color:var(--accent)}
.step .org{font-family:var(--f-display);font-weight:600;font-size:17.5px;line-height:1.3;color:var(--ink)}
.step .org .th{font-family:var(--f-th)}
.step .org .zh{font-family:var(--f-zh)}
.step .what{font-size:14.5px;color:var(--muted);line-height:1.65;margin-top:3px}
.step .what .th,.step .what .zh{line-height:1.8}
.step .chip{
  display:inline-block;font-family:var(--f-mono);font-size:10px;letter-spacing:.1em;text-transform:uppercase;
  color:var(--muted);border:1px solid var(--rule);padding:2px 8px;margin-bottom:6px;
}
.step .chip.th{font-family:var(--f-th);text-transform:none;letter-spacing:0;font-size:11.5px}
.step .chip.zh{font-family:var(--f-zh);text-transform:none;letter-spacing:0;font-size:11.5px}

/* skills */
.skillgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:0;border:1px solid var(--rule);background:var(--surface)}
.skillcol{padding:22px 22px 24px;border-right:1px solid var(--rule)}
.skillcol:last-child{border-right:0}
.skillcol h3{
  font-family:var(--f-mono);font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;
  color:var(--brass);margin:0 0 14px;font-weight:500;
}
.skillcol h3 .th{font-family:var(--f-th);text-transform:none;letter-spacing:.02em;font-size:12.5px;font-weight:600}
.skillcol h3 .zh{font-family:var(--f-zh);text-transform:none;letter-spacing:.02em;font-size:12.5px;font-weight:700}
.skillcol ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}
.skillcol li{font-size:14.5px;line-height:1.5;color:var(--ink-2);display:flex;gap:9px}
.skillcol li::before{content:"";flex:0 0 8px;height:1px;margin-top:12px;background:var(--muted);opacity:.55}
.skillcol li .th,.skillcol li .zh{line-height:1.65}

/* languages */
.langs{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px}
.langcard{border:1px solid var(--rule);background:var(--surface);padding:18px 20px}
.langcard .script{font-family:var(--f-display);font-size:26px;font-weight:600;color:var(--ink);line-height:1.1}
.langcard .script.zh{font-family:var(--f-zh);font-weight:700}
.langcard .script.thai{font-family:var(--f-th)}
.langcard .lvl{font-family:var(--f-mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--accent);margin-top:8px}
.langcard .lvl.th{font-family:var(--f-th);text-transform:none;letter-spacing:0;font-size:13px}
.langcard .lvl.zh{font-family:var(--f-zh);text-transform:none;letter-spacing:0;font-size:13px}
.langcard .note{font-size:13px;color:var(--muted);margin-top:4px;line-height:1.6}

/* contact */
.contact{
  margin-top:60px;border-top:1px solid var(--rule);padding-top:36px;
  display:flex;flex-wrap:wrap;gap:28px;align-items:flex-end;justify-content:space-between;
}
.contact .say{font-family:var(--f-display);font-size:clamp(21px,2.6vw,26px);font-weight:600;line-height:1.25;max-width:22ch;margin:0}
.contact .say .th{font-family:var(--f-th);font-size:.9em;line-height:1.5}
.contact .say .zh{font-family:var(--f-zh);font-weight:700}
.btns{display:flex;gap:10px;flex-wrap:wrap}
.btn{
  text-decoration:none;font-family:var(--f-mono);font-size:12.5px;letter-spacing:.05em;
  padding:11px 18px;border:1px solid var(--ink);color:var(--ink);
  transition:background .16s ease,color .16s ease,border-color .16s ease;
  white-space:nowrap;
}
.btn:hover{background:var(--ink);color:var(--bg)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .btn.primary{color:#0D1614}}
:root[data-theme="dark"] .btn.primary{color:#0D1614}
.btn.primary:hover{filter:brightness(1.08)}

footer{
  margin-top:44px;padding-top:18px;border-top:1px solid var(--rule);
  font-family:var(--f-mono);font-size:11px;letter-spacing:.06em;color:var(--muted);
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
}

/* ---------- responsive ---------- */
@media (max-width:900px){
  .wrap{grid-template-columns:1fr;gap:0;padding:0 20px 72px}
  .rail{position:static;padding:32px 0 26px;border-bottom:1px solid var(--rule)}
  .railnav{display:none}
  .langbar{position:fixed;right:14px;bottom:14px;z-index:50;box-shadow:var(--shadow);background:var(--surface)}
  .portrait{max-width:172px}
  .contact{flex-direction:column;align-items:flex-start}
  main{padding-top:32px}
  .stats{grid-template-columns:repeat(2,1fr)}
  .stat:nth-child(2){border-right:0}
  .stat:nth-child(1),.stat:nth-child(2){border-bottom:1px solid var(--rule)}
  .skillcol{border-right:0;border-bottom:1px solid var(--rule)}
  .skillcol:last-child{border-bottom:0}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none !important;animation:none !important;scroll-behavior:auto !important}
}
html{scroll-behavior:smooth}
/* ---- portrait ---- */
.portrait{
  position:relative;width:100%;max-width:268px;
  aspect-ratio:620/806;
  border:1.5px solid var(--ink);
  background:linear-gradient(178deg,var(--surface-2) 0%,var(--surface) 68%);
  overflow:hidden;
}
.portrait::after{content:"";position:absolute;inset:5px;border:1px solid var(--rule);pointer-events:none}
.portrait img{display:block;width:100%;height:100%;object-fit:contain;object-position:bottom center}

.altname{font-size:13px;color:var(--muted);margin-top:7px;line-height:1.55}
.altname .zhname{font-family:var(--f-zh)}
.altname .thname{font-family:var(--f-th)}
.company{
  font-family:var(--f-mono);font-size:10.5px;letter-spacing:.1em;text-transform:uppercase;
  color:var(--brass);margin-top:9px;line-height:1.6;
}
.company.th{font-family:var(--f-th);text-transform:none;letter-spacing:.01em;font-size:12.5px}
.company.zh{font-family:var(--f-zh);text-transform:none;letter-spacing:.01em;font-size:12.5px}

/* ---- award note ---- */
.award{
  display:flex;flex-direction:column;gap:3px;
  border-left:2px solid var(--brass);
  background:var(--surface);
  padding:13px 18px;margin-top:22px;max-width:64ch;
}
.award .medal{font-family:var(--f-mono);font-size:9.5px;letter-spacing:.14em;color:var(--brass);text-transform:uppercase}
.award .what{font-size:15px;color:var(--ink);font-weight:500}
.award .what .th{font-family:var(--f-th)}
.award .what .zh{font-family:var(--f-zh)}

/* ---- timeline year ---- */
.step .year{
  font-family:var(--f-mono);font-size:10.5px;letter-spacing:.05em;color:var(--muted);
  margin-left:9px;white-space:nowrap;font-variant-numeric:tabular-nums;
}

/* ---- personal bests ---- */
.pb{
  font-family:var(--f-display);font-weight:700;font-size:27px;line-height:1;
  letter-spacing:-.02em;font-variant-numeric:tabular-nums;color:var(--ink);
}
.pb small{display:block;font-family:var(--f-mono);font-size:10.5px;font-weight:400;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-top:9px;line-height:1.6}

/* ================= tech page ================= */
/* spec rows */
.spec{border-top:1px solid var(--rule)}
.srow{
  display:grid;grid-template-columns:210px minmax(0,1fr);gap:0 28px;
  padding:20px 0;border-bottom:1px solid var(--rule);align-items:start;
}
.srow .rk{
  font-family:var(--f-display);font-weight:600;font-size:17px;line-height:1.3;color:var(--ink);
}
.srow .rk .th{font-family:var(--f-th)}
.srow .rk .zh{font-family:var(--f-zh)}
.srow .rk .sub{
  display:block;font-family:var(--f-mono);font-size:10px;letter-spacing:.08em;
  text-transform:uppercase;color:var(--brass);font-weight:400;margin-top:5px;
}
.srow .rv{font-size:15px;line-height:1.72;color:var(--ink-2)}
.srow .rv .th,.srow .rv .zh{line-height:1.88}
.srow .rv p{margin:0}
.srow .rv .tools{margin-top:11px;padding-top:0}
.srow a.live{
  color:var(--accent);text-decoration:none;border-bottom:1px solid var(--accent);
  padding-bottom:1px;white-space:nowrap;
}
.srow a.live:hover{background:var(--accent-soft)}

/* tool index */
.toolindex{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:0;border:1px solid var(--rule);background:var(--surface)}
.toolindex section{padding:20px 22px 22px;border-right:1px solid var(--rule)}
.toolindex section:last-child{border-right:0}
.toolindex h3{
  font-family:var(--f-mono);font-size:10px;letter-spacing:.12em;text-transform:uppercase;
  color:var(--brass);margin:0 0 12px;font-weight:500;
}
.toolindex .tools{display:flex;flex-wrap:wrap;gap:6px;margin:0;padding:0}

@media (max-width:900px){
  .srow{grid-template-columns:1fr;gap:10px}
  .toolindex section{border-right:0;border-bottom:1px solid var(--rule)}
  .toolindex section:last-child{border-bottom:0}
}

/* Thai has no inter-word spaces; guarantee a break rather than a sideways-scrolling page */
body{overflow-wrap:break-word}
.srow>*{min-width:0}
.card,.card p,.prose,.lede,.skillcol li,figcaption{min-width:0}

/* ---- stack panel inside section 02 ---- */
.stackblock{margin-top:30px}
.stacklabel{
  font-family:var(--f-mono);font-size:10px;letter-spacing:.13em;text-transform:uppercase;
  color:var(--brass);display:flex;align-items:center;gap:9px;margin-bottom:10px;
}
.stacklabel::before{content:"";width:20px;height:1px;background:var(--brass)}
.stacklabel .th,.stacklabel .zh{text-transform:none;letter-spacing:.02em;font-size:12.5px}
.stacklabel .th{font-family:var(--f-th)}
.stacklabel .zh{font-family:var(--f-zh)}

/* ---- video block (source is 9:16 vertical) ---- */
.videoblock{
  margin:30px 0 0;max-width:64ch;
  display:grid;grid-template-columns:296px minmax(0,1fr);gap:0 26px;align-items:center;
}
.vframe{border:1px solid var(--rule);background:#000;overflow:hidden;line-height:0}
.vframe video{display:block;width:100%;height:auto}
.vmeta{display:flex;flex-direction:column;gap:11px}
.vlabel{
  font-family:var(--f-mono);font-size:10px;letter-spacing:.13em;text-transform:uppercase;
  color:var(--brass);display:flex;align-items:center;gap:9px;
}
.vlabel::before{content:"";width:20px;height:1px;background:var(--brass)}
.vlabel .cn{font-family:var(--f-zh);letter-spacing:.02em;font-size:12px}
.videoblock figcaption{margin:0;max-width:34ch}
@media (max-width:900px){
  .videoblock{grid-template-columns:1fr;gap:14px}
  .vframe{max-width:250px}
  .videoblock figcaption{max-width:none}
}

/* ---- terminal panel (deliberately dark in both themes) ---- */
.term{border:1px solid #2B3336;background:#14181A;overflow:hidden}
.term-bar{display:flex;align-items:center;padding:10px 16px;background:#1A2023;border-bottom:1px solid #2B3336}
.term-title{font-family:var(--f-mono);font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;color:#7E8A8E}
.term-scroll{overflow-x:auto;padding:20px 22px 22px}
.term-body{
  margin:0;font-family:var(--f-mono);font-size:12.5px;line-height:2;
  color:#C7CFD2;white-space:pre;
}
.term-body .tp{color:#9AA5A9}
.term-body .tc{color:#7FB5AE}
.term-body .tk{color:#8FBDB6}
.term-body .tm{color:#7E8A8E}
@media (max-width:900px){.term-body{font-size:11.5px;line-height:1.9}.term-scroll{padding:16px}}

.pb small .th{font-family:var(--f-th);text-transform:none;letter-spacing:0;font-size:12px}
.pb small .zh{font-family:var(--f-zh);text-transform:none;letter-spacing:0;font-size:12px}