:root {
  --bg: #0f1419;
  --fg: #e8eef4;
  --muted: #8b9aab;
  --accent: #3dd68c;
  --card: #1a222d;
  --border: #2a3544;
  font-family: "Segoe UI", system-ui, sans-serif;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: radial-gradient(1200px 600px at 10% -10%, #1a2a3a 0%, var(--bg) 55%);
  color: var(--fg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  background: rgba(0,0,0,0.25);
}
.brand { font-weight: 700; letter-spacing: 0.02em; }
nav a { margin-left: 1rem; }
.wrap { flex: 1; max-width: 720px; margin: 0 auto; padding: 2rem 1.25rem; width: 100%; }
.foot { padding: 1rem; text-align: center; color: var(--muted); font-size: 0.85rem; border-top: 1px solid var(--border); }
.hero h1 { font-size: 1.75rem; margin-bottom: 0.5rem; }
.lead { color: var(--muted); line-height: 1.5; }
.cards { display: grid; gap: 1rem; margin-top: 1.5rem; }
@media (min-width: 560px) { .cards { grid-template-columns: 1fr 1fr; } }
.card {
  display: block;
  padding: 1.25rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  transition: border-color 0.15s;
}
.card:hover { border-color: var(--accent); text-decoration: none; }
.card h2 { margin: 0 0 0.5rem; font-size: 1.1rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.95rem; }
.hint { margin-top: 2rem; color: var(--muted); font-size: 0.9rem; }
code { background: #111822; padding: 0.15rem 0.4rem; border-radius: 4px; }
.form label { display: block; margin-bottom: 1rem; color: var(--muted); font-size: 0.9rem; }
.form select, .form input[type=file] {
  display: block; margin-top: 0.35rem; width: 100%;
  padding: 0.5rem; border-radius: 8px; border: 1px solid var(--border);
  background: #111822; color: var(--fg);
}
.btn {
  background: var(--accent); color: #0b1218; border: none; padding: 0.65rem 1.2rem;
  border-radius: 8px; font-weight: 600; cursor: pointer;
}
.btn:hover { filter: brightness(1.05); }
.msg { margin-top: 1rem; color: var(--muted); }
.panel { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 1.25rem; line-height: 1.5; }
.scoreline { font-size: 1.25rem; }
.status { color: var(--muted); }
.panel ul { margin: 0.25rem 0 1rem 1.2rem; }