:root {
  --blue: #147a9c;
  --blue-dark: #0f5f7a;
  --navy: #0b3b4d;
  --ink: #1f2933;
  --muted: #667;
  --line: #e2e6ea;
  --bg: #eef1f3;
  --ok: #1f7a3d;
  --err: #c62828;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", Roboto, system-ui, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.55;
}
a { color: var(--blue); }

.topbar {
  background: #fff;
  border-bottom: 1px solid var(--line);
  padding: 14px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo { font-weight: 800; font-size: 24px; color: #1a4a6e; letter-spacing: -0.5px; }
.logo span { color: var(--blue); }
.support { font-size: 14px; }

main { max-width: 1040px; margin: 0 auto; padding: 32px 20px 60px; }

.hero { text-align: center; margin: 12px 0 32px; }
.hero h1 { font-size: 30px; font-weight: 600; margin: 0 0 8px; color: var(--navy); }
.hero p { max-width: 620px; margin: 0 auto; color: var(--muted); }

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
}
.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 22px;
}
.step {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--blue);
  background: #eaf4f7;
  border-radius: 999px;
  padding: 3px 10px;
  margin-bottom: 10px;
}
.card h2 { font-size: 18px; margin: 0 0 8px; font-weight: 600; }
.muted { color: var(--muted); font-size: 14px; }
.muted.small { font-size: 12px; }
.card ol.muted, .card ul { padding-left: 18px; margin: 8px 0 0; }
.card ol.muted li, .card ul li { margin-bottom: 4px; }

#code-form { display: flex; gap: 8px; margin-top: 6px; }
#code {
  flex: 1;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 10px 12px;
  font-size: 16px;
  letter-spacing: 3px;
  text-align: center;
  text-transform: uppercase;
}
#code-form button, .download-btn {
  border: 0;
  background: var(--blue);
  color: #fff;
  border-radius: 6px;
  padding: 10px 16px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
}
#code-form button:hover, .download-btn:hover { background: var(--blue-dark); }
#code-form button:disabled { opacity: 0.55; cursor: default; }

.download-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  margin-top: 4px;
}
.download-btn[aria-disabled="true"] {
  background: #9bb4bd;
  pointer-events: none;
}

.result {
  margin-top: 14px;
  border-radius: 6px;
  padding: 12px 14px;
  font-size: 14px;
}
.result.ok { background: #edf7f0; border: 1px solid #cfe8d8; color: var(--ok); }
.result.err { background: #fdefef; border: 1px solid #f3d2d2; color: var(--err); }
.result dl { margin: 6px 0 0; display: grid; grid-template-columns: auto 1fr; gap: 2px 12px; }
.result dt { color: var(--muted); }
.result dd { margin: 0; color: var(--ink); }

.rules {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 22px;
  margin-top: 22px;
}
.rules h3 { margin: 0 0 8px; font-size: 16px; }
.rules ul { margin: 0; padding-left: 18px; color: var(--muted); font-size: 14px; }
.rules li { margin-bottom: 4px; }

footer {
  text-align: center;
  color: var(--muted);
  font-size: 13px;
  padding: 24px;
}
footer span { margin: 0 4px; }