:root{--bg:#0b1220;--card:#121a2a;--ink:#e6e8ef;--sub:#a8b0c3;--brand:#7f1d1d;--btn:#e11d48;--stroke:#22304a}
*{box-sizing:border-box}html,body{height:100%}
body{margin:0;background:radial-gradient(1200px 500px at 30% -10%, #162037 0%, transparent 65%),var(--bg);color:var(--ink);font:14px/1.45 system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif}
.topbar{display:flex;align-items:center;justify-content:space-between;padding:10px 16px;background:linear-gradient(#7f1d1d,#611114);box-shadow:0 1px 0 rgba(0,0,0,.2)}
.brand{display:flex;gap:10px;align-items:center;font-weight:700}.logo{width:22px;height:22px;border-radius:4px}
.wrap{max-width:980px;margin:24px auto;padding:0 16px}
.card{background:var(--card);border:1px solid var(--stroke);border-radius:12px;padding:14px}
.tip{background:#0f1625;border:1px dashed var(--stroke);border-radius:10px;padding:10px 12px;margin-bottom:10px;color:var(--sub)}
.actions{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:10px}
.btn{border:1px solid var(--stroke);background:#1a2234;color:var(--ink);padding:8px 10px;border-radius:10px;cursor:pointer;font-weight:600}
.btn.primary{background:var(--btn);border:0}.btn.ghost{background:transparent}
.dropzone{position:relative;border:2px dashed var(--stroke);border-radius:12px;height:360px;display:flex;align-items:center;justify-content:center;overflow:hidden}
.dz-hint{text-align:center;color:var(--sub)}.preview{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;background:#0c1423}
.hidden{display:none}.footnote{color:var(--sub)}.footer{opacity:.7;text-align:center;margin:30px 0}
/* Header navigation links styled as small buttons */
.nav {
  display: flex;
  gap: 8px;
}

.nav-link {
  display: inline-block;
  border: 1px solid var(--stroke);
  background: #1a2234;
  color: var(--ink);
  padding: 6px 10px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.85rem;
}

.nav-link:hover {
  background: #111827;
}

.nav-link.active {
  background: var(--btn);
  border-color: var(--btn);
}