/* ============================================================
   Raymond Sheh — concept study. Shared design system.
   Palette: earthy, desaturated, multi-hue. One accent per page.
   ============================================================ */
:root{
  --bg:#f4f1e9; --bg2:#efeadf; --panel:#fffdf8; --panel2:#f7f3ea; --code:#eee8db;
  --ink:#1f2630; --dim:#586170; --faint:#8b9284; --line:#e4ddcd;
  /* the harmonious family */
  --slate:#2b5566; --teal:#2f8079; --ochre:#a9773f; --clay:#a9553d; --plum:#69496b; --indigo:#3f5680;
  --accent:var(--slate); --accent-soft:color-mix(in srgb,var(--accent) 78%,var(--ink));
  --tint:color-mix(in srgb,var(--accent) 9%,var(--panel));
  --shadow:0 1px 2px rgba(40,35,20,.04),0 10px 30px rgba(50,42,22,.06);
  --hair:1px solid var(--line);
}
html[data-theme="dark"]{
  --bg:#161a1f; --bg2:#12161b; --panel:#1c2128; --panel2:#171b21; --code:#12161b;
  --ink:#eceef1; --dim:#9aa3af; --faint:#69717c; --line:#28303a;
  --slate:#7fa8ba; --teal:#63b6ad; --ochre:#cb9a63; --clay:#cf8973; --plum:#a98bb0; --indigo:#8296c0;
  --tint:color-mix(in srgb,var(--accent) 14%,var(--panel));
  --shadow:0 1px 2px rgba(0,0,0,.3),0 14px 40px rgba(0,0,0,.42);
}
/* per-page accent */
.p-home{--accent:var(--slate)}
.p-research{--accent:var(--teal)}
.p-outreach{--accent:var(--ochre)}
.p-about{--accent:var(--plum)}
.p-contact{--accent:var(--clay)}
.p-writing{--accent:var(--indigo)}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);
  font:16.5px/1.65 "IBM Plex Sans",-apple-system,BlinkMacSystemFont,sans-serif;-webkit-font-smoothing:antialiased;
  overflow-x:hidden;transition:background .45s,color .45s}
a{color:var(--accent)}

/* quiet atmosphere */
.amb{position:fixed;inset:0;z-index:0;pointer-events:none;
  background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:64px 64px;opacity:.32;
  -webkit-mask-image:radial-gradient(circle at 72% 6%,#000,transparent 74%);mask-image:radial-gradient(circle at 72% 6%,#000,transparent 74%)}

#gauge{position:fixed;top:0;left:0;height:2px;width:0;z-index:80;background:var(--accent);transition:width .1s}

/* ---------- gate ---------- */
#gate{position:fixed;inset:0;z-index:100;display:flex;align-items:center;justify-content:center;padding:20px;background:var(--bg)}
#gate .panel{position:relative;background:var(--panel);border:var(--hair);border-radius:10px;box-shadow:var(--shadow);
  padding:40px 34px 32px;max-width:410px;width:100%;animation:fade .5s ease both}
@keyframes fade{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
.reg{position:absolute;width:10px;height:10px;border:1px solid var(--faint);opacity:.6}
.reg.tl{top:12px;left:12px;border-right:0;border-bottom:0}
.reg.tr{top:12px;right:12px;border-left:0;border-bottom:0}
.reg.bl{bottom:12px;left:12px;border-right:0;border-top:0}
.reg.br{bottom:12px;right:12px;border-left:0;border-top:0}
#gate .tick{font:500 10.5px/1 "IBM Plex Mono",monospace;letter-spacing:.22em;text-transform:uppercase;color:var(--ochre)}
#gate h1{font-family:"Fraunces",Georgia,serif;font-weight:600;font-size:30px;line-height:1.04;margin:12px 0 6px;letter-spacing:-.01em}
#gate p{color:var(--dim);font-size:14px;margin:0 0 22px}
#gate input{width:100%;padding:13px 15px;border-radius:7px;border:var(--hair);background:var(--code);
  color:var(--ink);font:15px/1 "IBM Plex Mono",monospace;text-align:center;letter-spacing:.24em;transition:box-shadow .2s,border-color .2s}
#gate input:focus{outline:none;border-color:var(--slate);box-shadow:0 0 0 3px color-mix(in srgb,var(--slate) 22%,transparent)}
#gate button{margin-top:12px;width:100%;padding:13px 15px;border:none;border-radius:7px;background:var(--slate);
  color:#fff;font:600 13.5px/1 "IBM Plex Sans";letter-spacing:.02em;cursor:pointer;transition:filter .2s,transform .15s}
html[data-theme="dark"] #gate button{color:#0e1520}
#gate button:hover{filter:brightness(1.06)}#gate button:active{transform:scale(.98)}
#gate .err{color:var(--clay);font:400 12px/1.4 "IBM Plex Mono",monospace;min-height:16px;margin-top:10px}

/* ---------- nav ---------- */
#site{display:none;position:relative;z-index:1}
.nav{position:sticky;top:0;z-index:60;backdrop-filter:blur(12px);background:color-mix(in srgb,var(--bg) 84%,transparent);border-bottom:var(--hair)}
.nav .in{max-width:1000px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:13px 24px}
.nav .brand{font-family:"Fraunces",Georgia,serif;font-weight:600;font-size:18px;letter-spacing:-.01em;text-decoration:none;color:var(--ink);white-space:nowrap}
.nav .brand .dot{color:var(--accent)}
.nav .links{display:flex;gap:2px;align-items:center;overflow-x:auto;scrollbar-width:none}
.nav .links::-webkit-scrollbar{display:none}
.nav .links a{font:500 13px/1 "IBM Plex Sans";color:var(--dim);text-decoration:none;padding:8px 12px;border-radius:6px;white-space:nowrap}
.nav .links a:hover{color:var(--ink);background:var(--panel2)}
.nav .links a.on{color:var(--accent)}
.tt{margin-left:6px;background:none;border:var(--hair);color:var(--dim);border-radius:6px;padding:7px 11px;font:500 11px/1 "IBM Plex Mono",monospace;letter-spacing:.06em;text-transform:uppercase;cursor:pointer}
.tt:hover{color:var(--ink)}

.wrap{max-width:1000px;margin:0 auto;padding:8px 24px 120px}

.reveal{opacity:0;transform:translateY(16px);transition:opacity .7s cubic-bezier(.2,.7,.3,1),transform .7s cubic-bezier(.2,.7,.3,1)}
.reveal.in{opacity:1;transform:none}

/* ---------- page header ---------- */
.phead{padding:44px 2px 8px}
.phead .kick{font:500 11.5px/1.7 "IBM Plex Mono",monospace;letter-spacing:.16em;text-transform:uppercase;color:var(--accent);margin-bottom:16px}
.phead h1{font-family:"Fraunces",Georgia,serif;font-weight:500;font-size:clamp(38px,7vw,72px);line-height:1;margin:0;letter-spacing:-.02em;color:var(--ink)}
.phead h1 .sn{font-weight:600}
.phead .sub{margin:22px 0 0;font-size:clamp(16px,2.1vw,20px);line-height:1.55;max-width:52ch;color:var(--dim)}
.phead .sub b{color:var(--ink);font-weight:500}
.phead .sig{margin-top:18px;font:400 13px/1.6 "IBM Plex Mono",monospace;color:var(--faint)}
.phead .sig .pin{color:var(--ochre)}

/* mission line */
.mission{margin:34px 0 8px;padding:20px 0;border-top:var(--hair);border-bottom:var(--hair);
  font-family:"Fraunces",Georgia,serif;font-weight:400;font-style:italic;font-size:clamp(17px,2.4vw,23px);line-height:1.5;color:var(--ink)}
.mission .em{font-style:normal;font-weight:600;color:var(--accent)}

/* section head */
section{margin:52px 0}
.sh{display:flex;align-items:baseline;gap:16px;margin:0 0 20px}
.sh .no{font:500 12px/1 "IBM Plex Mono",monospace;color:var(--accent);letter-spacing:.06em}
.sh h2{font-family:"Fraunces",Georgia,serif;font-weight:600;font-size:clamp(24px,3.4vw,32px);line-height:1.05;margin:0;letter-spacing:-.01em}
.sh .rule{flex:1;height:1px;background:var(--line);align-self:center}
.lead{color:var(--dim);font-size:16px;max-width:70ch;margin:0 0 22px;line-height:1.65}

.card{position:relative;background:var(--panel);border:var(--hair);border-radius:10px;box-shadow:var(--shadow);padding:24px}
.card .lab{font:500 10.5px/1 "IBM Plex Mono",monospace;letter-spacing:.14em;text-transform:uppercase;color:var(--faint);margin-bottom:12px}

/* discipline grid — top accent bar for color */
.disc{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:14px}
.d{border:var(--hair);border-top:3px solid var(--accent);border-radius:8px;padding:20px;background:var(--panel);box-shadow:var(--shadow);transition:transform .25s}
.d:hover{transform:translateY(-3px)}
.d .n{font:500 11px/1 "IBM Plex Mono",monospace;color:var(--accent);letter-spacing:.08em}
.d h4{font-family:"Fraunces",Georgia,serif;font-weight:600;font-size:19px;margin:12px 0 8px;line-height:1.1}
.d p{margin:0;font-size:13.5px;color:var(--dim);line-height:1.55}

/* feature */
.feat{display:grid;grid-template-columns:1.35fr 1fr;gap:16px}
@media(max-width:760px){.feat{grid-template-columns:1fr}}
.feat .big{background:var(--tint);border:var(--hair);border-left:3px solid var(--accent);border-radius:10px;padding:26px;box-shadow:var(--shadow)}
.feat .big h3{font-family:"Fraunces",Georgia,serif;font-weight:600;font-size:25px;margin:8px 0 10px;line-height:1.12}
.feat .big p{font-size:15px;color:var(--dim);margin:0 0 12px;line-height:1.6}
.side{display:flex;flex-direction:column;gap:14px}
.side .card{padding:20px}
.pill{display:inline-block;font:500 10px/1 "IBM Plex Mono",monospace;letter-spacing:.12em;text-transform:uppercase;padding:5px 10px;border-radius:5px;border:1px solid var(--accent);color:var(--accent);background:transparent}

/* numbers */
.readout{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:1px;background:var(--line);border:var(--hair);border-radius:10px;overflow:hidden}
.ro{background:var(--panel);padding:22px 20px}
.ro .v{font-family:"Fraunces",Georgia,serif;font-weight:600;font-size:40px;line-height:.95;color:var(--accent);letter-spacing:-.02em}
.ro .k{font:400 12.5px/1.45 "IBM Plex Sans";color:var(--dim);margin-top:10px}
.ro .src{font:400 10.5px/1.3 "IBM Plex Mono",monospace;color:var(--faint);margin-top:5px;letter-spacing:.03em}

/* research threads */
.threads{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media(max-width:760px){.threads{grid-template-columns:1fr}}
.th{border:var(--hair);border-radius:10px;padding:24px;background:var(--panel);box-shadow:var(--shadow)}
.th .tag{font:500 10.5px/1 "IBM Plex Mono",monospace;letter-spacing:.12em;text-transform:uppercase;color:var(--accent)}
.th h4{font-family:"Fraunces",Georgia,serif;font-weight:600;font-size:22px;margin:12px 0 10px;line-height:1.08}
.th p{margin:0 0 12px;font-size:14.5px;color:var(--dim);line-height:1.6}
.th .q{font-size:14px;color:var(--ink);border-left:2px solid var(--accent);padding-left:14px;font-family:"Fraunces",Georgia,serif;font-style:italic;line-height:1.5}
.th .triad{display:flex;gap:8px;margin-top:14px;flex-wrap:wrap}
.th .triad span{font:500 10.5px/1 "IBM Plex Mono",monospace;padding:6px 10px;border-radius:5px;background:var(--tint);border:var(--hair);color:var(--accent);letter-spacing:.05em}

/* blocks */
.warmblk{background:var(--tint);border:var(--hair);border-radius:10px;padding:28px}
.warmblk .two{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-top:10px}
@media(max-width:640px){.warmblk .two{grid-template-columns:1fr}}
.warmblk h4{font-family:"Fraunces",Georgia,serif;font-weight:600;font-size:20px;margin:2px 0 8px}
.warmblk p{font-size:14px;color:var(--dim);margin:0;line-height:1.6}

/* easter egg */
.egg{position:relative;border:var(--hair);border-radius:10px;background:var(--panel);padding:26px 24px;box-shadow:var(--shadow)}
.egg .prompt{display:flex;align-items:center;gap:14px;cursor:pointer;user-select:none}
.egg .chev{font-family:"IBM Plex Mono",monospace;color:var(--accent);font-size:18px;transition:transform .35s}
.egg.open .chev{transform:rotate(90deg)}
.egg .prompt .t{font-family:"Fraunces",Georgia,serif;font-weight:600;font-size:clamp(20px,3vw,26px);letter-spacing:-.01em}
.egg .hint{font:400 12px/1.4 "IBM Plex Mono",monospace;color:var(--faint);margin-top:8px;margin-left:32px}
.egg .drawer{max-height:0;overflow:hidden;transition:max-height .55s cubic-bezier(.3,.8,.3,1);margin-left:32px}
.egg.open .drawer{max-height:560px}
.egg .drawer .in{padding-top:20px;display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media(max-width:640px){.egg .drawer .in{grid-template-columns:1fr}}
.egg .rev{border:var(--hair);border-top:3px solid var(--accent);border-radius:8px;padding:18px;background:var(--panel2)}
.egg .rev .k{font:500 10.5px/1 "IBM Plex Mono",monospace;letter-spacing:.12em;text-transform:uppercase;color:var(--faint);margin-bottom:9px}
.egg .rev h5{font-family:"Fraunces",Georgia,serif;font-weight:600;font-size:18px;margin:0 0 7px}
.egg .rev p{margin:0;font-size:13.5px;color:var(--dim);line-height:1.55}

/* roles list */
.work{border-top:var(--hair)}
.wk{display:grid;grid-template-columns:96px 1fr auto;gap:18px;align-items:baseline;padding:17px 4px;border-bottom:var(--hair);transition:background .2s}
.wk:hover{background:var(--panel2)}
@media(max-width:640px){.wk{grid-template-columns:66px 1fr}.wk .role{display:none}}
.wk .yr{font:500 12px/1.3 "IBM Plex Mono",monospace;color:var(--accent)}
.wk .ti{font-weight:500;font-size:15.5px}
.wk .ti small{display:block;color:var(--dim);font-weight:400;font-size:13.5px;margin-top:4px;line-height:1.5}
.wk .ti a{color:inherit;text-decoration:none;border-bottom:1px solid color-mix(in srgb,var(--accent) 32%,transparent);transition:color .18s,border-color .18s}
.wk .ti a:hover{color:var(--accent);border-bottom-color:var(--accent)}
.wk .ti a .ext{font-size:.78em;color:var(--accent);margin-left:5px;opacity:.85;border:0}
.wk .ti small a{border-bottom:1px solid color-mix(in srgb,var(--accent) 32%,transparent)}
.wk .role{font:400 11px/1 "IBM Plex Mono",monospace;color:var(--faint);text-align:right;text-transform:uppercase;letter-spacing:.08em}

/* prose */
.prose{max-width:68ch}
.prose p{font-size:16.5px;color:var(--dim);line-height:1.75;margin:0 0 18px}
.prose p b{color:var(--ink);font-weight:500}
.prose .drop::first-letter{font-family:"Fraunces",Georgia,serif;font-weight:600;font-size:3.1em;line-height:.8;float:left;margin:6px 12px 0 0;color:var(--accent)}

/* contact */
.contact{display:grid;grid-template-columns:1.15fr 1fr;gap:16px}
@media(max-width:640px){.contact{grid-template-columns:1fr}}
.contact .card h3{font-family:"Fraunces",Georgia,serif;font-weight:600;font-size:25px;margin:0 0 10px;letter-spacing:-.01em}
.lk{display:inline-flex;align-items:center;gap:8px;font:500 12.5px/1 "IBM Plex Mono",monospace;letter-spacing:.02em;text-decoration:none;color:var(--ink);
  border:var(--hair);border-radius:6px;padding:11px 14px;margin:8px 8px 0 0;background:var(--panel2);transition:border-color .2s,transform .2s}
.lk:hover{border-color:var(--accent);transform:translateY(-1px)}
.lk .a{color:var(--accent)}

/* portrait (photo-ready; monogram fallback if no image present) */
.herorow{display:grid;grid-template-columns:1fr 260px;gap:36px;align-items:end}
@media(max-width:760px){.herorow{grid-template-columns:1fr;gap:24px}.herorow .portrait{max-width:220px}}
.aboutgrid{display:grid;grid-template-columns:220px 1fr;gap:30px;align-items:start}
@media(max-width:640px){.aboutgrid{grid-template-columns:1fr;gap:22px}.aboutgrid .portrait{max-width:200px}}
.portrait{position:relative;aspect-ratio:4/5;border-radius:12px;overflow:hidden;border:var(--hair);
  background:linear-gradient(155deg,var(--tint),var(--panel2));box-shadow:var(--shadow)}
.portrait img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:center 22%;z-index:2}
.portrait .ph{position:absolute;inset:0;z-index:1;display:grid;place-items:center;text-align:center;padding:16px}
.portrait .ph .mono{font-family:"Fraunces",Georgia,serif;font-weight:600;font-size:58px;line-height:1;color:var(--accent);letter-spacing:.02em}
.portrait .ph .lab{font:500 10px/1.5 "IBM Plex Mono",monospace;letter-spacing:.16em;text-transform:uppercase;color:var(--faint);margin-top:12px}

/* cross-page nav cards */
.next{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:10px}
@media(max-width:640px){.next{grid-template-columns:1fr}}
.nx{display:block;text-decoration:none;border:var(--hair);border-radius:10px;padding:22px;background:var(--panel);box-shadow:var(--shadow);transition:transform .2s,border-color .2s}
.nx:hover{transform:translateY(-3px);border-color:color-mix(in srgb,var(--accent) 45%,var(--line))}
.nx .k{font:500 10.5px/1 "IBM Plex Mono",monospace;letter-spacing:.14em;text-transform:uppercase;color:var(--accent)}
.nx h4{font-family:"Fraunces",Georgia,serif;font-weight:600;font-size:21px;margin:10px 0 6px;color:var(--ink)}
.nx p{margin:0;font-size:13.5px;color:var(--dim)}
.nx .go{margin-top:12px;font:500 12.5px/1 "IBM Plex Mono",monospace;color:var(--accent)}

footer{margin-top:56px;border-top:var(--hair)}
footer .in{max-width:1000px;margin:0 auto;padding:24px 24px 40px;color:var(--faint);font:400 12.5px/1.75 "IBM Plex Mono",monospace}
footer b{color:var(--dim)}
footer .fl{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:12px}
footer .fl a{color:var(--dim);text-decoration:none}
footer .fl a:hover{color:var(--accent)}