/* ===== Bridge Matching Sampler — project page ===== */
:root{
  --prior:#2c6fbb;      /* blue  */
  --target:#c0392b;     /* red   */
  --bridge:#8e44ad;     /* purple*/
  --bridge2:#d63384;    /* magenta (independent coupling) */
  --ink:#1c2230;
  --muted:#5d6675;
  --line:#e4e7ee;
  --bg:#ffffff;
  --bg-soft:#f7f8fb;
  --accent:#2c6fbb;
  --radius:14px;
  --maxw:920px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;color:var(--ink);background:var(--bg);
  font-family:'Inter',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  font-size:17px;line-height:1.65;-webkit-font-smoothing:antialiased;
}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
sup{font-size:.62em}
code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.88em;
  background:var(--bg-soft);padding:.1em .35em;border-radius:5px;color:#33415a}

/* ---- nav ---- */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.85);
  backdrop-filter:saturate(160%) blur(10px);border-bottom:1px solid var(--line)}
.nav-inner{max-width:var(--maxw);margin:0 auto;padding:.7rem 1.2rem;
  display:flex;align-items:center;justify-content:space-between}
.nav-brand{font-weight:800;letter-spacing:.04em;color:var(--ink)}
.nav-links{display:flex;gap:1.1rem;flex-wrap:wrap}
.nav-links a{color:var(--muted);font-size:.92rem;font-weight:500}
.nav-links a.active{color:var(--accent)}
@media(max-width:640px){.nav-links{gap:.7rem;font-size:.82rem}.nav-brand{display:none}}

/* ---- layout ---- */
main{max-width:var(--maxw);margin:0 auto;padding:0 1.2rem 5rem}
.section{padding:2.6rem 0;border-top:1px solid var(--line)}
h2{font-size:1.7rem;font-weight:700;letter-spacing:-.01em;margin:.2rem 0 1rem}
h3{font-size:1.12rem;font-weight:600;margin:1.6rem 0 .5rem}
p{margin:.7rem 0}
.lead{font-size:1.12rem}
.muted{color:var(--muted)}
.micro{font-size:.86rem;color:var(--muted)}
.aside{font-size:.95rem;color:var(--muted);border-left:3px solid var(--line);padding-left:1rem}

/* ---- hero ---- */
.hero{text-align:center;padding:3rem 0 1rem}
.venue{text-transform:uppercase;letter-spacing:.16em;font-size:.78rem;
  font-weight:600;color:var(--accent);margin:0}
.title{font-family:'Source Serif 4',Georgia,serif;font-size:3rem;line-height:1.08;
  font-weight:600;margin:.4rem 0 .2rem;letter-spacing:-.01em}
.subtitle{font-size:1.22rem;color:var(--muted);margin:.2rem auto 1.4rem;max-width:46ch}
.authors{list-style:none;display:flex;flex-wrap:wrap;justify-content:center;
  gap:.1rem 1.1rem;padding:0;margin:.4rem 0;font-weight:500}
.authors li{white-space:nowrap}
.affil{font-size:.9rem;color:var(--muted);margin:.3rem 0 0}
@media(max-width:640px){.title{font-size:2.1rem}.subtitle{font-size:1.05rem}}

.cta{display:flex;gap:.6rem;justify-content:center;flex-wrap:wrap;margin:1.6rem 0 .5rem}
.btn{display:inline-flex;align-items:center;gap:.45rem;border:1px solid var(--line);
  background:#fff;color:var(--ink);padding:.55rem 1.1rem;border-radius:999px;
  font-weight:600;font-size:.95rem;transition:.15s}
.btn:hover{text-decoration:none;border-color:var(--accent);color:var(--accent);transform:translateY(-1px)}
.btn-primary{background:var(--accent);color:#fff;border-color:var(--accent)}
.btn-primary:hover{color:#fff;background:#24588f;border-color:#24588f}
.btn .ico{font-size:.95em}

.hero-fig{margin:2.2rem 0 0}
.hero-fig img{width:100%;border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:0 8px 30px rgba(20,40,80,.06)}
figcaption{font-size:.86rem;color:var(--muted);margin-top:.6rem;text-align:left;line-height:1.5}

/* ---- cards ---- */
.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:.8rem;margin:1.4rem 0}
.card{background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);
  padding:1rem}
.card-k{font-weight:700;color:var(--accent);margin-bottom:.25rem}
.card-v{font-size:.92rem;color:var(--muted);line-height:1.5}
@media(max-width:760px){.cards{grid-template-columns:repeat(2,1fr)}}
@media(max-width:440px){.cards{grid-template-columns:1fr}}
.abstract{font-size:1rem;color:#2b3344}

/* ---- steps ---- */
.steps{list-style:none;counter-reset:step;padding:0;margin:1.2rem 0}
.steps>li{display:flex;gap:1rem;padding:1rem 0;border-top:1px dashed var(--line)}
.steps>li:first-child{border-top:none}
.step-n{flex:0 0 2rem;height:2rem;border-radius:50%;background:var(--accent);color:#fff;
  display:grid;place-items:center;font-weight:700}

.callout{background:linear-gradient(180deg,#fbf6fb,#fff);border:1px solid #ecd9ee;
  border-radius:var(--radius);padding:1.2rem 1.4rem;margin:1.6rem 0}
.callout h3{margin-top:0;color:var(--bridge)}

/* ---- demos ---- */
.demo{background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);
  padding:1rem;margin:1.2rem 0}
.demo canvas{width:100%;height:auto;background:#fff;border:1px solid var(--line);
  border-radius:10px;display:block;touch-action:none}
.controls{display:flex;flex-wrap:wrap;align-items:center;gap:.7rem 1.2rem;margin-top:.9rem}
.controls label{display:flex;flex-direction:column;font-size:.82rem;font-weight:600;
  color:var(--muted);gap:.25rem}
.controls label.grow{flex:1 1 220px}
.controls input[type=range]{width:160px;accent-color:var(--accent)}
.controls label.grow input[type=range]{width:100%}
.controls .val{color:var(--ink);font-weight:700}
.controls .check{flex-direction:row;align-items:center;gap:.4rem;color:var(--ink)}
.controls select{padding:.3rem .4rem;border:1px solid var(--line);border-radius:7px;font:inherit}
.mini{border:1px solid var(--line);background:#fff;border-radius:8px;padding:.45rem .9rem;
  font-weight:600;cursor:pointer;font-size:.9rem;transition:.15s}
.mini:hover{border-color:var(--accent);color:var(--accent)}
.mini.primary{background:var(--accent);color:#fff;border-color:var(--accent)}
.mini.primary:hover{background:#24588f;color:#fff}
.mini:disabled{opacity:.45;cursor:not-allowed}
.iter{font-size:.9rem;color:var(--muted)}
.iter b{color:var(--ink)}
.hint{font-size:.9rem;color:var(--muted);margin-top:.8rem;
  background:#fff;border:1px dashed var(--line);border-radius:10px;padding:.6rem .8rem}

.panels{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.panels figure{margin:0}
@media(max-width:680px){.panels{grid-template-columns:1fr}}

/* ---- results ---- */
.result-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem;margin:1.2rem 0}
.result{border:1px solid var(--line);border-radius:var(--radius);padding:1.1rem;background:#fff}
.result h3{margin-top:0}
@media(max-width:760px){.result-grid{grid-template-columns:1fr}}
.mini-table{width:100%;border-collapse:collapse;font-size:.9rem;margin:.4rem 0}
.mini-table th,.mini-table td{padding:.35rem .4rem;text-align:center;border-bottom:1px solid var(--line)}
.mini-table th:first-child,.mini-table td:first-child{text-align:left;color:var(--muted)}
.mini-table tr.hl td{background:#eef4fb;color:var(--ink)}

/* ---- bibtex ---- */
.bibtex-wrap{position:relative}
.bibtex-wrap pre{background:#0f1729;color:#cdd6e4;border-radius:var(--radius);
  padding:1.2rem;overflow:auto;font-size:.82rem;line-height:1.55}
.copy{position:absolute;top:.7rem;right:.7rem;background:#22304d;color:#cdd6e4;
  border:none;border-radius:7px;padding:.35rem .7rem;cursor:pointer;font-weight:600;font-size:.8rem}
.copy:hover{background:#2d4067}

.footer{max-width:var(--maxw);margin:0 auto;padding:2rem 1.2rem 3rem;
  border-top:1px solid var(--line);color:var(--muted);font-size:.9rem}