/* ================================================================
   DSB-IFEval project page — vanilla CSS (no framework)
   ================================================================ */
:root{
  --ink:#1a1f2b; --muted:#5b6472; --faint:#8b94a3;
  --line:#e6e9ef; --bg:#ffffff; --panel:#f7f8fb;
  --brand:#2b4bd6; --brand-dk:#1d3391; --brand-soft:#eaeeff;
  --accent:#0e9488; --warn:#b4472e; --warn-soft:#fbeae5;
  --ok:#166a4a; --ok-soft:#e6f4ec;
  --maxw:1000px; --radius:14px;
  --shadow:0 1px 2px rgba(20,30,60,.05),0 8px 24px rgba(20,30,60,.06);
  --mono:"SFMono-Regular",ui-monospace,"JetBrains Mono",Menlo,Consolas,monospace;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Inter,Roboto,Helvetica,Arial,sans-serif;
  --serif:"Iowan Old Style","Palatino Linotype",Georgia,"Times New Roman",serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:70px}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);
  font-size:17px;line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 22px}
section{padding:52px 0;border-top:1px solid var(--line)}
h2{font-size:1.5rem;letter-spacing:-.01em;margin:0 0 6px}
h2 .kv{color:var(--faint);font-weight:600;font-size:.72em;margin-right:10px}
h3{font-size:1.08rem;margin:26px 0 8px}
p{margin:0 0 14px}
.lead{font-size:1.06rem;color:#2a3242}
.small{font-size:.86rem;color:var(--muted)}

/* ---------- sticky nav ---------- */
nav.top{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.86);
  backdrop-filter:saturate(1.4) blur(8px);border-bottom:1px solid var(--line)}
nav.top .wrap{display:flex;align-items:center;gap:18px;height:56px}
nav.top .brand{font-weight:800;letter-spacing:-.02em;color:var(--ink)}
nav.top .links{display:flex;gap:20px;margin-left:auto;flex-wrap:wrap}
nav.top .links a{color:var(--muted);font-weight:600;font-size:.92rem}
nav.top .links a:hover{color:var(--brand);text-decoration:none}
@media(max-width:640px){nav.top .links{display:none}}

/* ---------- hero ---------- */
header.hero{background:
  radial-gradient(1200px 380px at 50% -120px,var(--brand-soft),transparent 70%);
  padding:56px 0 20px;text-align:center}
.badge{display:inline-block;font-weight:700;font-size:.74rem;letter-spacing:.14em;
  text-transform:uppercase;color:var(--brand-dk);background:var(--brand-soft);
  border:1px solid #d6ddff;padding:5px 12px;border-radius:999px;margin-bottom:18px}
h1.title{font-family:var(--serif);font-size:2.5rem;line-height:1.12;
  letter-spacing:-.02em;margin:0 auto 6px;max-width:16em}
h1.title .mono{font-family:var(--mono);font-size:.82em;color:var(--brand-dk)}
.subtitle{color:var(--muted);font-size:1.05rem;max-width:34em;margin:8px auto 22px}
.authors{font-size:1.06rem;margin:6px 0 2px}
.authors a{font-weight:600}
.affil{color:var(--muted);font-size:.96rem;margin-bottom:22px}
.buttons{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin:8px 0 6px}
.btn{display:inline-flex;align-items:center;gap:9px;font-weight:650;font-size:.96rem;
  padding:11px 18px;border-radius:999px;border:1px solid var(--ink);
  background:var(--ink);color:#fff;transition:.15s}
.btn:hover{text-decoration:none;transform:translateY(-1px);
  box-shadow:0 6px 18px rgba(20,30,60,.18)}
.btn.alt{background:#fff;color:var(--ink)}
.btn.alt:hover{border-color:var(--brand);color:var(--brand-dk)}
.btn .ico{width:18px;height:18px;display:inline-block}

/* ---------- highlight cards ---------- */
.stats{display:grid;grid-template-columns:repeat(5,1fr);gap:14px;margin-top:6px}
@media(max-width:820px){.stats{grid-template-columns:repeat(2,1fr)}}
.stat{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:18px 16px;text-align:center}
.stat .n{font-family:var(--serif);font-size:1.9rem;font-weight:700;color:var(--brand-dk);
  line-height:1}
.stat .l{font-size:.82rem;color:var(--muted);margin-top:7px;font-weight:600}

/* ---------- teaser: conditioning levels ---------- */
.levels{display:grid;grid-template-columns:repeat(6,1fr);gap:10px;margin:18px 0 6px}
@media(max-width:820px){.levels{grid-template-columns:repeat(2,1fr)}}
.lvl{border:1px solid var(--line);border-radius:12px;padding:14px;background:#fff;
  box-shadow:var(--shadow)}
.lvl .tag{font-family:var(--mono);font-weight:700;color:var(--brand-dk);font-size:.9rem}
.lvl .nm{font-weight:700;font-size:.95rem;margin:2px 0 4px}
.lvl .ds{font-size:.82rem;color:var(--muted);line-height:1.45}
.lvl.l2{border-color:#c9d3ff;background:linear-gradient(180deg,#f4f6ff,#fff)}
.lvl.safe{border-color:#f0cabc;background:linear-gradient(180deg,#fdf1ec,#fff)}

/* ---------- generic panels / figures ---------- */
.panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:20px 22px;margin:16px 0}
figure{margin:22px 0;text-align:center}
figure img{max-width:100%;height:auto;border:1px solid var(--line);border-radius:12px;
  background:#fff;box-shadow:var(--shadow)}
figcaption{font-size:.86rem;color:var(--muted);margin-top:10px;text-align:left}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:22px}
@media(max-width:820px){.grid2{grid-template-columns:1fr}}

/* ---------- tables ---------- */
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:12px}
table.data{border-collapse:collapse;width:100%;font-size:.9rem}
table.data caption{caption-side:top;text-align:left;font-weight:700;padding:12px 14px;
  font-size:.95rem}
table.data th,table.data td{padding:9px 12px;border-bottom:1px solid var(--line);
  text-align:right;white-space:nowrap}
table.data th:first-child,table.data td:first-child{text-align:left;font-weight:600}
table.data thead th{background:var(--panel);color:var(--muted);font-size:.8rem;
  text-transform:uppercase;letter-spacing:.04em}
table.data tbody tr:hover{background:#fbfcff}
table.data .l2{background:var(--brand-soft)}
td.best{font-weight:800;color:var(--brand-dk)}
td.ok{background:var(--ok-soft);color:var(--ok);font-weight:700}
td.bad{background:var(--warn-soft);color:var(--warn);font-weight:700}

/* ---------- findings ---------- */
.finding{display:flex;gap:14px;padding:16px 0;border-bottom:1px solid var(--line)}
.finding:last-child{border-bottom:0}
.finding .k{flex:0 0 40px;font-family:var(--serif);font-size:1.5rem;font-weight:700;
  color:var(--brand)}
.finding .t b{color:var(--ink)}
.finding .t{color:var(--muted);font-size:.98rem}

/* ---------- example ---------- */
.turns{display:flex;flex-direction:column;gap:8px;margin:10px 0}
.turn{padding:10px 14px;border-radius:10px;font-size:.92rem;max-width:88%}
.turn.user{background:var(--panel);border:1px solid var(--line);align-self:flex-start}
.turn.flag{background:var(--warn-soft);border:1px solid #f0cabc;align-self:flex-start}
.turn .who{font-size:.72rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;
  color:var(--faint);margin-bottom:2px}
.pill{display:inline-block;font-size:.74rem;font-weight:700;padding:3px 9px;border-radius:999px;
  margin-right:6px}
.pill.gp{background:var(--brand-soft);color:var(--brand-dk)}
.pill.gn{background:#eef1f5;color:var(--muted)}

/* ---------- bibtex ---------- */
pre.bib{background:#0f1526;color:#d7deee;border-radius:12px;padding:18px 20px;overflow:auto;
  font-family:var(--mono);font-size:.82rem;line-height:1.55}
.copy{float:right;font-size:.8rem;font-weight:700;color:var(--brand);cursor:pointer;
  background:none;border:0;padding:0}

footer{padding:34px 0 60px;color:var(--muted);font-size:.86rem;text-align:center}
footer a{font-weight:600}