:root {
  --bg1: #0f1b2b;
  --bg2: #1d3a5f;
  --card: rgba(9, 16, 28, 0.86);
  --text: #f4f8ff;
  --muted: #9fb3cc;
  --accent: #3ee0ff;
  --gold: #ffd84a;
  --danger: #ff6b6b;
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  min-height: 100%;
  display: grid;
  place-items: center;
  padding: 16px;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: radial-gradient(circle at 30% 20%, var(--bg2), var(--bg1) 70%);
}
.card {
  width: min(400px, 100%);
  padding: 28px 24px 22px;
  border-radius: 18px;
  background: var(--card);
  border: 1px solid rgba(62, 224, 255, 0.35);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
  text-align: center;
}
.ring {
  width: 74px;
  height: 74px;
  margin: 0 auto 12px;
  border-radius: 50%;
  border: 5px solid transparent;
  background: conic-gradient(from 0deg, #ff5f6d, #ffd84a, #3ee0ff, #b86bff, transparent 82%, transparent) border-box;
  -webkit-mask: radial-gradient(farthest-side, transparent calc(100% - 6px), #000 calc(100% - 5px));
  mask: radial-gradient(farthest-side, transparent calc(100% - 6px), #000 calc(100% - 5px));
  animation: spin 3s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .ring { animation: none; } }
h1 {
  margin: 0;
  font-size: 30px;
  letter-spacing: 3px;
  color: var(--gold);
  text-shadow: 0 2px 0 #7a5a00;
}
.sub { margin: 4px 0 22px; color: var(--muted); font-size: 14px; }
form { text-align: left; }
label { display: block; font-size: 14px; margin-bottom: 6px; color: var(--muted); }
.field { display: flex; gap: 8px; }
input {
  flex: 1;
  min-width: 0;
  font-size: 16px;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid #3a4f6b;
  background: #0b1422;
  color: var(--text);
}
input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
#show {
  flex: none;
  padding: 0 14px;
  font-size: 14px;
  border-radius: 10px;
  border: 1px solid #3a4f6b;
  background: #16233a;
  color: var(--text);
  cursor: pointer;
}
.msg { margin: 10px 0 0; color: var(--danger); font-size: 14px; }
.go {
  width: 100%;
  margin-top: 18px;
  padding: 13px;
  font-size: 16px;
  font-weight: 700;
  border: 0;
  border-radius: 10px;
  background: linear-gradient(90deg, #26c6ff, #6a7bff);
  color: #fff;
  cursor: pointer;
}
.go:hover { filter: brightness(1.08); }
.note { margin: 16px 0 0; font-size: 12px; color: var(--muted); }