:root {
  color-scheme: light dark;
  font-family: "Segoe UI", Tahoma, sans-serif;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: linear-gradient(160deg, #0f172a, #1e293b 40%, #334155);
  color: #e2e8f0;
}

.card {
  width: min(720px, 92vw);
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(148, 163, 184, 0.35);
  border-radius: 14px;
  padding: 24px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
}

h1 { margin-top: 0; font-size: 1.4rem; }

.row { margin: 10px 0; }
.label { font-size: 0.82rem; opacity: 0.8; }
.value { font-family: Consolas, monospace; font-size: 0.95rem; }

input {
  width: 100%;
  box-sizing: border-box;
  border-radius: 8px;
  border: 1px solid #64748b;
  padding: 10px 12px;
  background: #0b1220;
  color: #e2e8f0;
}

button {
  margin-top: 12px;
  border: 0;
  border-radius: 8px;
  padding: 10px 14px;
  cursor: pointer;
  background: #22c55e;
  color: #06210f;
  font-weight: 700;
}

button.secondary {
  background: #475569;
  color: #f8fafc;
  margin-left: 8px;
}

.notice {
  margin-top: 12px;
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 0.92rem;
}
.notice.ok { background: rgba(34, 197, 94, 0.2); border: 1px solid rgba(34, 197, 94, 0.4); }
.notice.err { background: rgba(239, 68, 68, 0.2); border: 1px solid rgba(239, 68, 68, 0.4); }
.notice.info { background: rgba(59, 130, 246, 0.2); border: 1px solid rgba(59, 130, 246, 0.4); }

.hidden { display: none; }