* { box-sizing: border-box; }
:root {
  --bg:#f7f9fc; --text:#102033; --muted:#5d6b7a; --line:#d9e2ec;
  --blue:#073b7a; --cyan:#0089a7; --green:#51a33a;
}
body {
  margin:0; font-family:Arial, Helvetica, sans-serif; color:var(--text);
  background:radial-gradient(circle at top left, rgba(0,137,167,.14), transparent 28rem),
             radial-gradient(circle at bottom right, rgba(81,163,58,.12), transparent 28rem),
             var(--bg);
}
.page { width:min(1080px,94vw); margin:0 auto; padding:28px 0; }
.hero {
  background:#fff; border:1px solid var(--line); border-radius:28px; padding:30px;
  box-shadow:0 18px 45px rgba(16,32,51,.08);
}
.logos { display:flex; justify-content:space-between; align-items:center; gap:18px; margin-bottom:12px; }
.logo { display:block; object-fit:contain; }
.aqua-logo { max-width:145px; max-height:65px; }
.bochum-logo {  max-width: 270px;max-height: 85px; background: transparent; border-radius: 0; padding: 0; }
.event {
  display:inline-block; margin:0 0 16px; padding:8px 14px; color:#fff;
  background:linear-gradient(135deg,var(--blue),var(--cyan)); border-radius:999px;
  font-weight:800; letter-spacing:.04em;
}
h1 { margin:0; max-width:980px; font-size:clamp(1.25rem,2.2vw,2rem); line-height:1.05; letter-spacing:-.02em; }
.authors { margin:22px 0 6px; font-size:clamp(1.15rem,2.4vw,1.55rem); font-weight:800; }
.affiliation,.correspondence { margin:7px 0; color:var(--muted); font-size:1rem; }
.correspondence a { color:var(--blue); font-weight:800; }
.correspondence span { margin-left:6px; }
.top-actions { display:grid; grid-template-columns:repeat(4,1fr); gap:12px; margin:18px 0; }
.top-actions a,.links a {
  display:block; text-align:center; text-decoration:none; color:white; background:var(--blue);
  border-radius:14px; padding:14px 12px; font-weight:800; box-shadow:0 8px 22px rgba(7,59,122,.12);
}
.top-actions a:nth-child(2) { background:var(--green); }
.top-actions a:nth-child(3),.top-actions a:nth-child(4) { background:var(--cyan); }
.usecases { display:grid; gap:14px; }
.usecase {
  display:grid; grid-template-columns:84px 1fr; gap:20px; align-items:start; background:rgba(255,255,255,.92);
  border:1px solid var(--line); border-radius:24px; padding:22px; box-shadow:0 12px 34px rgba(16,32,51,.06);
}
.usecase-number {
  width:64px; height:64px; display:grid; place-items:center; color:#fff;
  background:linear-gradient(135deg,var(--blue),var(--cyan)); border-radius:18px; font-weight:900; font-size:1.25rem;
}
.usecase h2 { margin:0 0 14px; color:var(--blue); font-size:clamp(1.25rem,3vw,2rem); line-height:1.15; }
.links { display:grid; grid-template-columns:repeat(4,1fr); gap:10px; }
footer { padding:24px 0 8px; text-align:center; color:var(--muted); }
@media (max-width:850px) {
  .logos { flex-direction:column; align-items:flex-start; }
  .aqua-logo,.bochum-logo { max-width:100%; }
  .top-actions,.links { grid-template-columns:1fr; }
  .usecase { grid-template-columns:1fr; }
  .hero { padding:22px; }
}