:root {
  --bg:#ffffff; --fg:#1a1a1a; --muted:#666; --line:#e6e6e6;
  --card:#f7f7f8; --accent:#de302f; --accent2:#34599c; --hero-bg:#f4f2ee;
  --max:920px;
  --orange:#e69f00; --green:#009e73; --blue:#34599c; --red:#de302f;
}
@media (prefers-color-scheme: dark) {
  :root { --bg:#141519; --fg:#e8e8ea; --muted:#9a9ba3; --line:#2b2d34;
          --card:#1d1f25; --hero-bg:#191a1f; }
}
:root[data-theme="dark"]  { --bg:#141519; --fg:#e8e8ea; --muted:#9a9ba3; --line:#2b2d34; --card:#1d1f25; --hero-bg:#191a1f; }
:root[data-theme="light"] { --bg:#fff; --fg:#1a1a1a; --muted:#666; --line:#e6e6e6; --card:#f7f7f8; --hero-bg:#f4f2ee; }

* { box-sizing:border-box; }
body { margin:0; background:var(--bg); color:var(--fg);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  line-height:1.65; font-size:17px; }
.wrap { max-width:var(--max); margin:0 auto; padding:0 22px; }
img { max-width:100%; height:auto; display:block; }
a { color:var(--accent2); text-decoration:none; }
a:hover { text-decoration:underline; }

/* hero */
.hero { background:var(--hero-bg); border-bottom:1px solid var(--line); text-align:center; padding:46px 0 40px; }
.venue { color:var(--muted); text-transform:uppercase; letter-spacing:.09em; font-size:.78rem; margin:0 0 10px; }
.hero h1 { font-size:1.7rem; line-height:1.3; margin:0 auto; max-width:800px; letter-spacing:-.01em; font-weight:700; }
.brand { display:inline-block; font-size:2rem; line-height:1.05; letter-spacing:-.01em; margin-bottom:6px; }
.pop { font-family:"Brush Script MT",cursive; color:var(--fg); font-weight:800; font-size:2.8rem; }
.title-sub { font-size:1.5rem; font-weight:600; }
.authors { margin:20px 0 4px; font-size:1.12rem; }
.authors a { color:#3d90e0; text-decoration:none; }
.authors a:hover { color:#2f7ac4; text-decoration:none; }
.sup { color:#666; font-size:.72em; vertical-align:super; }
@media (prefers-color-scheme: dark) { .sup { color:#aaa; } }
:root[data-theme="dark"]  .sup { color:#aaa; }
:root[data-theme="light"] .sup { color:#666; }
.affil { color:var(--muted); font-size:.95rem; margin:6px 0 0; }
.email { color:var(--muted); font-size:.9rem; font-family:inconsolata,monospace; margin:2px 0 0; }
.note-eq { color:var(--muted); font-size:.82rem; margin-top:6px; }

.links { display:flex; gap:10px; justify-content:center; flex-wrap:wrap; margin-top:22px; }
.btn { display:inline-flex; align-items:center; gap:7px; padding:9px 18px; border-radius:999px;
  background:rgba(90,95,106,.14); color:var(--fg); border:none;
  font-size:.95rem; font-weight:400; transition:background .15s; }
.btn .ic { width:16px; height:16px; flex:none; }
.btn:hover { background:rgba(90,95,106,.24); text-decoration:none; }
@media (prefers-color-scheme: dark) {
  .btn { background:rgba(255,255,255,.08); }
  .btn:hover { background:rgba(255,255,255,.15); }
}
:root[data-theme="dark"] .btn { background:rgba(255,255,255,.08); }
:root[data-theme="dark"] .btn:hover { background:rgba(255,255,255,.15); }
:root[data-theme="light"] .btn { background:rgba(90,95,106,.14); }
:root[data-theme="light"] .btn:hover { background:rgba(90,95,106,.24); }

/* sections */
main { padding:8px 0 48px; }
section { margin:46px 0; }
h2 { font-size:1.55rem; text-align:center; margin-bottom:20px; }
h2::after { content:""; display:block; width:52px; height:3px; background:#444; margin:10px auto 0; border-radius:2px; }
@media (prefers-color-scheme: dark) { h2::after { background:#aaa; } }
:root[data-theme="dark"]  h2::after { background:#aaa; }
:root[data-theme="light"] h2::after { background:#444; }
h3 { font-size:1.02rem; margin:0 0 6px; }
p.lead { max-width:760px; margin:0 auto; text-align:justify; }

figure { margin:24px auto; }
figure img { border:none; border-radius:10px; background:#fff; padding:10px; }
figcaption { color:var(--muted); font-size:.9rem; margin-top:12px; text-align:left; max-width:820px; margin-left:auto; margin-right:auto; }
.teaser { max-width:460px; }   /* height ≈ Figure 2 at desktop width */
.teaser img { display:block; margin:0 auto; }

.stats { display:flex; gap:10px; flex-wrap:wrap; justify-content:center; }
.stat { flex:1 1 130px; background:var(--card); border:none; border-radius:10px; padding:14px 14px; text-align:center; }
.stat .num { display:block; font-size:1.02rem; font-weight:700; color:var(--fg); }
.stat .lab { color:var(--muted); font-size:.82rem; }

/* cases */
.legend { display:flex; gap:18px; justify-content:center; flex-wrap:wrap; margin:28px 0 18px; font-size:.86rem; color:var(--muted); }
.legend b { font-weight:700; }
.k-orange{color:var(--orange)} .k-green{color:var(--green)} .k-blue{color:var(--blue)} .k-red{color:var(--red)}

.case { display:grid; grid-template-columns:210px 1fr; gap:20px; align-items:center;
  background:var(--card); border:none; border-radius:12px; padding:16px 20px; margin:14px 0; }
.case.two { grid-template-columns:210px 210px 1fr; }
.case img { border:none; border-radius:8px; background:#fff; padding:6px; }
.case .body h3 { color:var(--fg); }
.case .body p { margin:6px 0 0; font-size:.95rem; }
.case .freq { display:inline-block; margin-top:8px; font-size:.8rem; color:var(--muted);
  background:var(--bg); border:1px solid var(--line); border-radius:999px; padding:2px 10px; }
.tag { font-size:.72rem; font-weight:700; text-transform:uppercase; letter-spacing:.04em;
  padding:2px 8px; border-radius:5px; color:#fff; }
.tag.imperm { background:var(--red); } .tag.perm { background:var(--blue); } .tag.neutral{ background:#777; }

table { width:100%; border-collapse:collapse; margin:8px auto; font-size:.88rem; }
th,td { text-align:left; padding:9px 12px; border-bottom:1px solid var(--line); vertical-align:top; }
th { font-size:.76rem; text-transform:uppercase; letter-spacing:.04em; color:var(--muted); }
code { background:var(--card); padding:2px 6px; border-radius:5px; font-size:.9em; font-family:inconsolata,monospace; }
pre { background:var(--card); border:1px solid var(--line); border-radius:10px; padding:16px; overflow-x:auto; }
pre code { background:none; padding:0; }
.note { color:var(--muted); font-size:.8rem; text-align:center; }

footer { border-top:1px solid var(--line); padding:24px 0; color:var(--muted); font-size:.85rem; text-align:center; }

@media (max-width:640px){
  .hero h1{font-size:1.9rem;}
  .case,.case.two{grid-template-columns:1fr; text-align:center;}
  .case img{max-width:260px;margin:0 auto;}
}