:root{
  --serif:"Newsreader",Georgia,serif;
  --sans:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  /* light theme */
  --bg:#ffffff; --bg-alt:#f6f7fb; --card-bg:#ffffff; --viz-card-bg:#fcfcfe;
  --ink:#1d1d28; --body:#2b2f3a; --muted:#5a6270; --line:#e6e8ee;
  --accent:#3a4a8c; --accent-link:#3a4a8c;
  --hero-1:#eef1fb; --hero-2:#ffffff; --explore-1:#ffffff; --explore-2:#f4f6fc;
  --hl-bg:#eef3ff; --chip-text:#3a4050;
  --btn-bg:#1d1d28; --btn-fg:#ffffff; --btn-hover:#3a4a8c;
  --caveat-bg:#fffaf0; --caveat-bd:#f0e2c0; --caveat-ac:#e3b341; --caveat-tx:#5b4a24;
  --code-bg:#1d2130; --code-fg:#e7ebf5;
  --swatch-bd:rgba(0,0,0,.15); --shadow:rgba(20,24,50,.06);
  /* viz neutrals (read by hue_viz.js) */
  --viz-line:#c9cedb; --viz-grid:#e3e6ef; --viz-axis:#7a8090; --viz-strong:#1d1d28; --viz-ring:#ffffff;
}
.dark{
  --bg:#0f1117; --bg-alt:#151823; --card-bg:#171a24; --viz-card-bg:#12141c;
  --ink:#e7ebf5; --body:#c4ccda; --muted:#9aa3b2; --line:#2a2f3d;
  --accent:#8aa0ff; --accent-link:#9db0ff;
  --hero-1:#1a1f33; --hero-2:#0f1117; --explore-1:#0f1117; --explore-2:#151b2b;
  --hl-bg:#1b2540; --chip-text:#c4ccda;
  --btn-bg:#e7ebf5; --btn-fg:#11141c; --btn-hover:#8aa0ff;
  --caveat-bg:#2a2410; --caveat-bd:#4a3f1c; --caveat-ac:#e3b341; --caveat-tx:#e6d49a;
  --code-bg:#0b0d13; --code-fg:#e7ebf5;
  --swatch-bd:rgba(255,255,255,.25); --shadow:rgba(0,0,0,.45);
  --viz-line:#3a4150; --viz-grid:#2a2f3d; --viz-axis:#9aa3b2; --viz-strong:#e7ebf5; --viz-ring:#12141c;
}
*{box-sizing:border-box}
html{background:var(--bg)}
body{font-family:var(--sans);color:var(--ink);background:var(--bg);line-height:1.6;
  transition:background .25s ease,color .25s ease;}
.container.narrow{max-width:820px}
.narrow-c{max-width:760px;margin-left:auto;margin-right:auto}
.mono{font-family:ui-monospace,SFMono-Regular,Menlo,monospace}
.mt{margin-top:1.6rem}
.centered{text-align:center}

/* ---------- theme toggle ---------- */
.theme-toggle{position:fixed;top:14px;right:16px;z-index:50;width:40px;height:40px;border-radius:999px;
  border:1px solid var(--line);background:var(--card-bg);color:var(--ink);cursor:pointer;
  display:flex;align-items:center;justify-content:center;font-size:1rem;box-shadow:0 2px 10px var(--shadow);
  transition:background .2s,color .2s,transform .12s}
.theme-toggle:hover{transform:translateY(-1px);color:var(--accent)}
.theme-toggle .fa-sun{display:none}
.dark .theme-toggle .fa-sun{display:inline}
.dark .theme-toggle .fa-moon{display:none}

/* ---------- hero ---------- */
.hero-head{padding:3.4rem 1rem 2.4rem;text-align:center;
  background:radial-gradient(120% 140% at 50% -10%,var(--hero-1) 0%,var(--hero-2) 55%);
  border-bottom:1px solid var(--line);}
.venue-badge{display:inline-block;font-weight:700;letter-spacing:.06em;font-size:.8rem;
  color:#fff;background:var(--accent);padding:.28rem .7rem;border-radius:999px;margin-bottom:1.1rem;}
.paper-title{font-family:var(--serif);font-weight:600;font-size:2.5rem;line-height:1.16;
  letter-spacing:-.01em;margin:0 auto .9rem;max-width:900px;color:var(--ink)}
.authors{font-size:1.08rem;margin:.2rem 0 .35rem}
.authors a{color:var(--accent-link);font-weight:600}
.authors sup{color:var(--muted);font-weight:500}
.affil{color:var(--muted);font-size:.92rem;max-width:820px;margin:0 auto .5rem}
.affil a{color:var(--muted);text-decoration:underline;text-underline-offset:2px}
.affil a:hover{color:var(--accent)}
.corresp{font-size:.88rem;color:var(--muted);margin:0 auto 1.4rem}
.corresp a{color:var(--accent-link)}
.link-buttons{display:flex;gap:.6rem;justify-content:center;flex-wrap:wrap}
.lbtn{display:inline-flex;align-items:center;gap:.45rem;background:var(--btn-bg);color:var(--btn-fg);
  padding:.5rem 1.05rem;border-radius:999px;font-weight:600;font-size:.94rem;transition:transform .12s,background .12s;}
.lbtn:hover{background:var(--btn-hover);color:#fff;transform:translateY(-1px)}
.lbtn .icon{font-size:.95rem}

/* ---------- sections ---------- */
.section{padding:2.6rem 1rem}
.section.alt{background:var(--bg-alt);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.sec-title{font-family:var(--serif);font-weight:600;letter-spacing:-.01em;margin-bottom:1rem!important;color:var(--ink)}
.sec-title.centered{text-align:center}
.body-text{font-size:1.05rem;color:var(--body)}
.body-text a{color:var(--accent-link);font-weight:600;text-decoration:underline;text-underline-offset:2px}
figure img{display:block;width:100%;height:auto;border-radius:10px;border:1px solid var(--line);
  background:#fff;box-shadow:0 1px 10px var(--shadow)}
figcaption{font-size:.88rem;color:var(--muted);margin-top:.6rem;text-align:left;line-height:1.5}
.teaser-sec{padding-top:2rem;padding-bottom:1.4rem}

.chips .chip-card{background:var(--card-bg);border:1px solid var(--line);border-radius:12px;padding:1.1rem 1.2rem;height:100%;
  font-size:.97rem;color:var(--chip-text)}
.chip-card h3{font-family:var(--serif);font-size:1.2rem;font-weight:600;margin-bottom:.3rem;color:var(--ink)}

.finding-h{font-family:var(--serif);font-size:1.32rem;font-weight:600;margin:2rem 0 .5rem;color:var(--ink)}
.table-wrap{overflow-x:auto}
.result-table{background:transparent;font-size:.95rem;color:var(--body)}
.result-table thead th{color:var(--muted);font-weight:600;border-bottom:2px solid var(--line)}
.result-table td{border-color:var(--line);color:var(--body)}
.result-table tr.hl{background:var(--hl-bg);font-weight:600}

.caveat{margin-top:1.1rem;background:var(--caveat-bg);border:1px solid var(--caveat-bd);border-left:4px solid var(--caveat-ac);
  padding:.85rem 1.05rem;border-radius:8px;font-size:.92rem;color:var(--caveat-tx)}
.caveat i{color:var(--caveat-ac)}

/* ---------- interactive ---------- */
.explore-sec{background:linear-gradient(180deg,var(--explore-1),var(--explore-2));border-top:1px solid var(--line)}
.viz-shell{max-width:1080px;margin:1.6rem auto 0;background:var(--card-bg);border:1px solid var(--line);
  border-radius:16px;padding:1.2rem 1.2rem 1rem;box-shadow:0 6px 30px var(--shadow)}
.viz-controls{display:flex;gap:1.2rem;align-items:flex-end;flex-wrap:wrap;padding:.2rem .2rem 1rem;
  border-bottom:1px solid var(--line);margin-bottom:1rem}
.ctrl{display:flex;flex-direction:column;gap:.35rem}
.ctrl.grow{flex:1;min-width:220px}
.ctrl label{font-size:.8rem;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}
.select select{background:var(--viz-card-bg);color:var(--ink);border-color:var(--line)}
#hueSlider{width:100%;accent-color:var(--accent);height:6px}
#hueVal{color:var(--ink);font-weight:600}
.viz-grid{display:grid;grid-template-columns:.85fr 1.15fr 1.15fr;gap:1rem}
.viz-card{background:var(--viz-card-bg);border:1px solid var(--line);border-radius:12px;padding:.7rem .8rem;min-width:0}
.card-label{font-size:.78rem;font-weight:600;color:var(--muted);margin-bottom:.4rem;text-transform:uppercase;letter-spacing:.03em}
.stimulus-card{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center}
.stimulus-canvas{width:100%;aspect-ratio:4/3;background:#fff;border:1px solid var(--line);border-radius:8px;
  display:flex;align-items:center;justify-content:center;margin:.2rem 0 .9rem}
.stimulus-word{font-family:Helvetica,Arial,sans-serif;font-weight:500;font-size:2rem;word-break:break-word;
  line-height:1.1;transition:color .08s linear}
.swatch-row{display:flex;align-items:center;gap:.5rem;margin-top:auto}
.swatch{width:22px;height:22px;border-radius:6px;border:1px solid var(--swatch-bd);display:inline-block}
.small{font-size:.82rem;color:var(--muted)}
.viz-grid svg{width:100%;height:auto;display:block}
.viz-note{font-size:.82rem;color:var(--muted);margin-top:.9rem;text-align:center;line-height:1.55}
.viz-note .prov{display:inline-block;margin-top:.2rem;opacity:.7;font-size:.76rem}
.buttons .button{background:var(--viz-card-bg);color:var(--ink);border-color:var(--line)}
.is-active{background:var(--accent)!important;color:#fff!important;border-color:var(--accent)!important}

/* ---------- bibtex / footer ---------- */
.bibtex{background:var(--code-bg);color:var(--code-fg);border-radius:10px;padding:1.1rem 1.2rem;overflow-x:auto;
  font-family:ui-monospace,Menlo,monospace;font-size:.86rem;line-height:1.5}
.footer-mini{background:var(--bg);border-top:1px solid var(--line);padding:2rem 1rem;text-align:center;
  color:var(--muted);font-size:.86rem}
.footer-mini .dim{color:var(--muted);opacity:.8;margin-top:.4rem;font-size:.8rem}

@media (max-width:880px){
  .paper-title{font-size:1.9rem}
  .viz-grid{grid-template-columns:1fr;}
  .chips .column{padding-bottom:.4rem}
}