/* ==========================================================================
   neurorealm.org — Dian Jiao (Jason), personal site
   The warm "daylight sibling" of neurorealm.ai. Paper & ink, not black glass.
   Fraunces (display) · Inter (body) · IBM Plex Mono (data/labels).
   Shared gene with .ai: the thread-violet #7C3AED.
   ========================================================================== */

:root{
  /* --- warm daylight palette --- */
  --paper:#FAF6EF; --paper-2:#F3ECDF; --paper-3:#ECE3D3;
  --ink:#1C1826; --ink-soft:#5A5468; --ink-faint:#8B8498;
  --line:rgba(28,24,38,.10); --line-strong:rgba(28,24,38,.18);

  /* the shared gene + four-realm accents (used sparingly) */
  --thread:#7C3AED;              /* Minds / the through-line */
  --commerce:#E8A33C;            /* marigold */
  --machines:#3B6FE0;            /* cobalt */
  --minds:#7C3AED;               /* violet */
  --play:#E8604C;                /* coral */
  --portal:#0F0D22;              /* the one dark element — the .ai preview */

  /* type */
  --display:"Fraunces","Georgia",serif;
  --sans:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,"SF Mono",Menlo,monospace;

  /* spacing (8px base) */
  --s1:8px; --s2:16px; --s3:24px; --s4:40px; --s5:64px; --s6:96px; --s7:150px;
  --maxw:1080px; --readw:720px;
  --ease:cubic-bezier(.22,1,.36,1);
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;scroll-padding-top:80px}
body{
  background:var(--paper); color:var(--ink);
  font-family:var(--sans); font-size:17px; line-height:1.65; font-weight:400;
  -webkit-font-smoothing:antialiased; overflow-x:hidden;
  /* the faintest warm paper grain via layered radial washes */
  background-image:
    radial-gradient(60vw 60vw at 82% -8%, rgba(124,58,237,.05), transparent 60%),
    radial-gradient(50vw 50vw at 8% 12%, rgba(232,163,60,.045), transparent 55%);
  background-attachment:fixed;
}
img{max-width:100%;display:block}
a{color:var(--thread);text-decoration:none;transition:color .2s var(--ease)}
a:hover{color:var(--ink)}
::selection{background:rgba(124,58,237,.22);color:var(--ink)}

/* ---- layout ---- */
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 clamp(20px,5vw,56px)}
.section{padding:var(--s7) 0}
@media(max-width:760px){.section{padding:var(--s6) 0}}
.read{max-width:var(--readw)}
.center{text-align:center}
.center .read{margin-inline:auto}
.center p,.center .lede{margin-inline:auto}

/* ---- type ---- */
h1,h2,h3{font-family:var(--display);font-weight:400;line-height:1.08;
  letter-spacing:-.015em;color:var(--ink);text-wrap:balance;
  font-optical-sizing:auto;font-variation-settings:"SOFT" 30,"WONK" 0}
.display{font-size:clamp(2.7rem,6.4vw,5rem);line-height:1.02;max-width:16ch}
.h-l{font-size:clamp(1.9rem,3.9vw,3rem);line-height:1.12;max-width:24ch}
.h-m{font-size:1.5rem;line-height:1.22}
.h-s{font-size:1.18rem;line-height:1.3}
/* wonk exactly one word per headline for warmth */
.wonk{font-variation-settings:"SOFT" 40,"WONK" 1;font-style:italic;color:var(--thread)}
.eyebrow{font-family:var(--mono);font-size:.75rem;font-weight:500;text-transform:uppercase;
  letter-spacing:.18em;color:var(--ink-faint);display:block;margin-bottom:var(--s2)}
.lede{font-size:1.24rem;line-height:1.55;color:var(--ink);max-width:60ch;font-weight:400}
p{color:var(--ink-soft);max-width:66ch}
.muted{color:var(--ink-soft)}
.faint{color:var(--ink-faint)}
strong{color:var(--ink);font-weight:600}
em{font-style:italic}
.mono{font-family:var(--mono)}
/* organisation / company names — underlined to distinguish from bold roles */
.org{text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:2.5px;
  text-decoration-color:rgba(28,24,38,.38)}

/* ---- wordmark / nav ---- */
.wordmark{font-family:var(--display);font-weight:500;font-size:1.28rem;color:var(--ink);
  display:inline-flex;align-items:center;gap:.45em;letter-spacing:0}
.wordmark .dot{width:.4em;height:.4em;border-radius:50%;background:var(--thread);
  box-shadow:0 0 0 4px rgba(124,58,237,.14);display:inline-block}
.wordmark small{font-family:var(--mono);font-size:.6em;color:var(--ink-faint);
  text-transform:uppercase;letter-spacing:.12em;font-weight:400}

.nav{position:fixed;inset:0 0 auto 0;z-index:50;height:66px;display:flex;align-items:center;
  transition:background .3s var(--ease),border-color .3s var(--ease),box-shadow .3s var(--ease);
  border-bottom:1px solid transparent}
.nav.scrolled{background:rgba(250,246,239,.82);backdrop-filter:blur(16px) saturate(1.2);
  border-bottom-color:var(--line);box-shadow:0 1px 30px rgba(28,24,38,.05)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;width:100%}
.nav-links{display:flex;align-items:center;gap:var(--s4);list-style:none}
.nav-links a{font-size:.94rem;color:var(--ink-soft);font-family:var(--sans);font-weight:500}
.nav-links a:hover,.nav-links a.active{color:var(--ink)}
@media(max-width:820px){.nav-links{gap:var(--s3)}.nav-links .hide-sm{display:none}}

/* ---- buttons ---- */
.btn{display:inline-flex;align-items:center;gap:.5em;font-family:var(--sans);font-size:.98rem;
  font-weight:600;padding:12px 24px;border-radius:999px;cursor:pointer;border:1px solid transparent;
  transition:transform .25s var(--ease),box-shadow .25s var(--ease),background .25s,color .2s,border-color .2s}
.btn-primary{background:var(--ink);color:var(--paper)}
.btn-primary:hover{transform:translateY(-1px);background:var(--thread);color:#fff;
  box-shadow:0 10px 30px rgba(124,58,237,.28)}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line-strong)}
.btn-ghost:hover{border-color:var(--thread);color:var(--thread)}
.cta-row{display:flex;gap:var(--s2);flex-wrap:wrap;margin-top:var(--s4)}
.center .cta-row{justify-content:center}

/* quick-links row (LinkedIn · Scholar · email) */
.links{display:flex;flex-wrap:wrap;gap:var(--s3);align-items:center;font-family:var(--mono);
  font-size:.85rem;letter-spacing:.02em}
.center .links{justify-content:center}
.links a{color:var(--ink-soft);display:inline-flex;align-items:center;gap:.4em}
.links a:hover{color:var(--thread)}
.links a svg{width:1.05em;height:1.05em;opacity:.8}

/* ---- hero ---- */
.hero{min-height:92svh;display:flex;align-items:center;position:relative;
  padding:calc(66px + var(--s4)) 0 var(--s5)}
.hero-grid{display:grid;grid-template-columns:1.12fr .88fr;gap:clamp(32px,6vw,88px);
  align-items:center;width:100%}
@media(max-width:860px){.hero-grid{grid-template-columns:1fr;gap:var(--s5)}}
.hero .display{font-size:clamp(2.3rem,4.4vw,3.7rem);max-width:none}
.hero .kicker{font-family:var(--mono);font-size:.8rem;letter-spacing:.16em;text-transform:uppercase;
  color:var(--thread);margin-bottom:var(--s3)}
.hero .lede{margin-top:var(--s3)}
.hero-copy{position:relative;z-index:1}
.hero-portrait{position:relative;justify-self:center;width:100%;max-width:235px}
@media(max-width:860px){.hero-portrait{max-width:205px;justify-self:start;margin-top:var(--s2)}}
/* warm glow behind the whole frame */
.portrait-glow{position:absolute;inset:-16%;z-index:0;border-radius:50%;filter:blur(42px);
  background:radial-gradient(circle at 55% 35%,rgba(232,163,60,.40),rgba(124,58,237,.20) 55%,transparent 72%)}
/* offset violet keyline peeking out for depth */
.hero-portrait::after{content:"";position:absolute;left:22px;right:-20px;top:24px;bottom:-20px;z-index:0;
  border:1.5px solid var(--thread);border-radius:18px;opacity:.42}
/* the matted gallery frame */
.hero-portrait .frame{position:relative;z-index:1;background:#FFFDF9;padding:13px 13px 0;
  border-radius:16px;border:1px solid var(--line);box-shadow:0 32px 66px rgba(28,24,38,.22);margin:0}
.hero-portrait .frame img{width:100%;height:auto;border-radius:8px;display:block}
.hero-portrait .placard{font-family:var(--mono);font-size:.72rem;letter-spacing:.08em;
  color:var(--ink-faint);text-align:center;text-transform:uppercase;padding:13px 4px 15px}
.hero-portrait .placard span{color:var(--thread)}

/* ---- stat strip ---- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--s3);
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:var(--s5) 0}
@media(max-width:820px){.stats{grid-template-columns:repeat(2,1fr);gap:var(--s4)}}
@media(max-width:420px){.stats{grid-template-columns:1fr}}
.stat{font-family:var(--display);font-size:clamp(2.2rem,4.5vw,3.2rem);line-height:1;color:var(--ink);
  font-variation-settings:"SOFT" 0,"WONK" 0}
.stat .sup{font-size:.4em;color:var(--thread);vertical-align:super;font-family:var(--mono)}
.stat-label{font-family:var(--mono);font-size:.74rem;letter-spacing:.06em;color:var(--ink-soft);
  margin-top:.6em;line-height:1.4;text-transform:uppercase}
.footnotes{margin-top:var(--s4);font-family:var(--mono);font-size:.74rem;color:var(--ink-faint);
  line-height:1.7;max-width:none}
.footnotes b{color:var(--thread);font-weight:500}

/* ---- cards / grid ---- */
.grid{display:grid;gap:var(--s3)}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
@media(max-width:860px){.g3,.g4{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.g2,.g3,.g4{grid-template-columns:1fr}}
.card{background:rgba(255,255,255,.55);border:1px solid var(--line);border-radius:18px;
  padding:var(--s4);transition:transform .25s var(--ease),box-shadow .25s var(--ease),border-color .25s}
.card:hover{transform:translateY(-3px);border-color:var(--line-strong);
  box-shadow:0 18px 44px rgba(28,24,38,.08)}

/* realm cards — each carries its accent as a top rule */
.realm{position:relative;overflow:hidden}
.realm::before{content:"";position:absolute;inset:0 0 auto 0;height:3px;background:var(--accent,var(--thread))}
.realm .rnum{font-family:var(--mono);font-size:.78rem;color:var(--accent,var(--thread));letter-spacing:.1em}
.realm h3{margin:.5em 0 .3em}
.realm .rstate{font-family:var(--mono);font-size:.72rem;text-transform:uppercase;letter-spacing:.1em;
  color:var(--ink-faint);margin-top:.8em;display:block}

/* ---- publications ---- */
.paper{border-left:2px solid var(--line-strong);padding:var(--s1) 0 var(--s1) var(--s3);
  transition:border-color .2s var(--ease)}
.paper:hover{border-left-color:var(--thread)}
.paper .venue{font-family:var(--mono);font-size:.74rem;letter-spacing:.05em;color:var(--thread);
  text-transform:uppercase}
.paper h3{font-size:1.12rem;line-height:1.3;margin:.35em 0;font-variation-settings:"SOFT" 20,"WONK" 0}
.paper .cite{font-size:.92rem;color:var(--ink-soft)}
.paper .cite a{font-family:var(--mono);font-size:.82rem}
.pub-list{display:grid;gap:var(--s4)}

/* ---- books ---- */
.books{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--s3)}
@media(max-width:860px){.books{grid-template-columns:repeat(2,1fr)}}
@media(max-width:480px){.books{grid-template-columns:1fr}}
.book{border-radius:12px;padding:var(--s3);background:rgba(255,255,255,.5);
  border:1px solid var(--line);display:flex;flex-direction:column;gap:.5em;min-height:220px}
.book .spine{width:34px;height:6px;border-radius:3px;background:var(--accent,var(--thread));margin-bottom:.4em}
.book .role{font-family:var(--mono);font-size:.7rem;text-transform:uppercase;letter-spacing:.08em;color:var(--ink-faint)}
.book .title{font-family:var(--display);font-size:1.12rem;line-height:1.2;color:var(--ink)}
.book .orig{font-size:.82rem;color:var(--ink-faint)}
.book .by{font-size:.85rem;color:var(--ink-soft);margin-top:auto}
/* featured authored book — full-width horizontal card above the translations */
.book.feature{flex-direction:row;align-items:flex-start;gap:var(--s3);min-height:auto;
  background:rgba(255,255,255,.6)}
.book.feature .spine.tall{width:6px;height:auto;align-self:stretch;min-height:70px;
  border-radius:3px;margin:0;flex-shrink:0}
.book.feature .book-body{display:flex;flex-direction:column;gap:.35em}
.book.feature .title{font-size:1.5rem;line-height:1.15}
.book.feature .orig{font-size:.95rem;max-width:62ch}
.book.feature .by{margin-top:.2em}
@media(max-width:560px){.book.feature{flex-direction:column}
  .book.feature .spine.tall{width:34px;height:6px;min-height:0;align-self:auto}}

/* ---- book covers (image shelf) ---- */
.book-feature-cover{display:flex;gap:var(--s4);align-items:center;background:rgba(255,255,255,.6);
  border:1px solid var(--line);border-radius:18px;padding:var(--s4)}
.book-feature-cover .fc{width:118px;flex-shrink:0;aspect-ratio:2/3;border-radius:7px;overflow:hidden;
  box-shadow:0 14px 32px rgba(28,24,38,.18);border:1px solid var(--line)}
.book-feature-cover .fc img{width:100%;height:100%;object-fit:cover;object-position:top}
.book-feature-cover .role{font-family:var(--mono);font-size:.7rem;text-transform:uppercase;
  letter-spacing:.08em;color:var(--ink-faint)}
.book-feature-cover .by{font-family:var(--mono);font-size:.8rem;color:var(--ink-soft);margin-top:.4em}
@media(max-width:560px){.book-feature-cover{flex-direction:column;align-items:flex-start}}

.shelf{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--s4);align-items:start}
@media(max-width:760px){.shelf{grid-template-columns:repeat(2,1fr);gap:var(--s4)}}
.bk{display:flex;flex-direction:column;gap:.7em}
.bk .cover{aspect-ratio:3/4;border-radius:7px;overflow:hidden;border:1px solid var(--line);
  box-shadow:0 14px 32px rgba(28,24,38,.16);transition:transform .25s var(--ease),box-shadow .25s var(--ease)}
.bk:hover .cover{transform:translateY(-4px);box-shadow:0 22px 44px rgba(28,24,38,.22)}
.bk .cover img{width:100%;height:100%;object-fit:cover;object-position:top}
/* typographic cover for translations with no cover art on file */
.bk.type .cover{display:flex;flex-direction:column;justify-content:space-between;padding:var(--s3);
  background:radial-gradient(130% 100% at 25% 15%,rgba(255,255,255,.22),transparent 55%),var(--accent,var(--thread))}
.bk.type .ct{font-family:var(--display);font-size:1.28rem;line-height:1.14;color:#fff;
  font-variation-settings:"SOFT" 20,"WONK" 0}
.bk.type .ca{font-family:var(--mono);font-size:.72rem;color:rgba(255,255,255,.82);letter-spacing:.02em}
.bk .cap .role{font-family:var(--mono);font-size:.68rem;text-transform:uppercase;letter-spacing:.08em;
  color:var(--ink-faint)}
.bk .cap .t{font-family:var(--display);font-size:1.02rem;line-height:1.2;color:var(--ink);margin:.15em 0}
.bk .cap .a{font-size:.82rem;color:var(--ink-soft)}

/* ---- press clipping gallery ---- */
.clips{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--s4)}
@media(max-width:700px){.clips{grid-template-columns:1fr}}
.clip{display:flex;flex-direction:column;background:rgba(255,255,255,.55);border:1px solid var(--line);
  border-radius:14px;overflow:hidden;transition:transform .25s var(--ease),box-shadow .25s var(--ease)}
.clip:hover{transform:translateY(-3px);box-shadow:0 18px 40px rgba(28,24,38,.10)}
.clip .mast{height:110px;display:flex;align-items:center;justify-content:center;position:relative;
  background:var(--paper-3);border-bottom:1px solid var(--line);overflow:hidden}
.clip .mast::before{content:"";position:absolute;inset:0 0 auto 0;height:3px;background:var(--accent,var(--thread))}
.clip .mast .name{font-family:var(--display);font-size:1.7rem;color:var(--ink);letter-spacing:-.01em;
  font-variation-settings:"SOFT" 20,"WONK" 0}
/* logos are trimmed to content; cap by width so thin wordmarks read well and
   chunkier marks stay ~50px tall (Livable is the reference) */
.clip .mast img{max-height:50px;max-width:180px;object-fit:contain}
.clip .meta{padding:var(--s3) var(--s4) var(--s4)}
.clip .meta .out{font-family:var(--mono);font-size:.72rem;text-transform:uppercase;letter-spacing:.06em;
  color:var(--thread)}
.clip .meta .hl{font-family:var(--display);font-size:1.1rem;line-height:1.26;color:var(--ink);margin-top:.35em;
  font-variation-settings:"SOFT" 20,"WONK" 0}
.clip .meta .note{font-family:var(--mono);font-size:.7rem;color:var(--ink-faint);margin-top:.5em}
.clip .meta .src{display:inline-block;margin-top:.7em;font-family:var(--mono);font-size:.72rem;
  color:var(--thread);letter-spacing:.02em}
.clip .meta .src:hover{color:var(--ink)}

/* ---- talks / press lists ---- */
.line-list{list-style:none;display:grid;gap:0}
.line-list li{display:flex;gap:var(--s3);align-items:baseline;padding:var(--s3) 0;
  border-top:1px solid var(--line)}
.line-list li:last-child{border-bottom:1px solid var(--line)}
.line-list .tag{font-family:var(--mono);font-size:.72rem;letter-spacing:.06em;color:var(--ink-faint);
  text-transform:uppercase;width:150px;flex-shrink:0;display:flex;gap:8px}
.line-list .tag .rl{width:74px;flex-shrink:0}
.line-list .tag .yr{color:var(--ink-soft)}
@media(max-width:560px){.line-list .tag{width:134px}}
.line-list .what{color:var(--ink)}
.line-list .what a{color:var(--ink)}
.line-list .what a:hover{color:var(--thread)}

/* ---- testimonials ---- */
.quote{background:rgba(255,255,255,.5);border:1px solid var(--line);border-radius:18px;padding:var(--s4)}
.quote p{font-family:var(--display);font-size:1.16rem;line-height:1.45;color:var(--ink);
  font-variation-settings:"SOFT" 30,"WONK" 0;max-width:none}
.quote .attr{margin-top:var(--s3);font-size:.9rem;color:var(--ink-soft);font-family:var(--sans)}
.quote .attr b{color:var(--ink)}
.quote .attr .ticker{font-family:var(--mono);font-size:.76rem;color:var(--thread);letter-spacing:.04em}

/* ---- the .ai portal card (the one dark element) ---- */
.portal{background:var(--portal);border-radius:22px;padding:var(--s5);color:#EDE9FE;position:relative;
  overflow:hidden;border:1px solid rgba(167,139,250,.2)}
.portal::before{content:"";position:absolute;width:340px;height:340px;right:-90px;top:-90px;border-radius:50%;
  background:radial-gradient(circle,rgba(124,58,237,.5),transparent 70%);filter:blur(30px)}
.portal .eyebrow{color:#A78BFA}
.portal h2,.portal h3{color:#fff}
.portal p{color:#9990B8;position:relative}
.portal .btn-primary{background:linear-gradient(135deg,#7C3AED,#5B21B6);color:#fff;position:relative}
.portal .btn-primary:hover{filter:brightness(1.12);box-shadow:0 10px 30px rgba(124,58,237,.4)}

/* ---- footer ---- */
.footer{border-top:1px solid var(--line);padding:var(--s6) 0 var(--s4);background:var(--paper-2)}
.footer .cols{display:flex;flex-wrap:wrap;gap:var(--s5);justify-content:space-between;align-items:flex-start}
.footer .col-brand{max-width:34ch}
.footer h4{font-family:var(--mono);font-size:.72rem;text-transform:uppercase;letter-spacing:.1em;
  color:var(--ink-faint);margin-bottom:var(--s2);font-weight:500}
.footer ul{list-style:none}.footer li{margin-bottom:.55em}
.footer a{color:var(--ink-soft);font-size:.94rem}.footer a:hover{color:var(--thread)}
.footer .fine{margin-top:var(--s5);padding-top:var(--s3);border-top:1px solid var(--line);
  color:var(--ink-faint);font-family:var(--mono);font-size:.78rem;display:flex;flex-wrap:wrap;
  gap:var(--s2) var(--s4);justify-content:space-between;align-items:center}

/* ---- reveal motion ---- */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.in{opacity:1;transform:none}

/* scroll-progress thread (subtle Spark accent) */
.thread-bar{position:fixed;top:0;left:0;height:2px;width:0;z-index:60;
  background:linear-gradient(90deg,var(--commerce),var(--machines),var(--minds),var(--play));
  transition:width .1s linear}

/* section separators */
hr.rule{border:0;border-top:1px solid var(--line);margin:0}
.divider{max-width:var(--maxw);margin-inline:auto;padding:0 clamp(20px,5vw,56px)}

/* ---- reduced motion ---- */
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  .thread-bar{display:none}
  .card:hover{transform:none}
}