:root {
  --bg: #07090d;
  --card: rgba(14, 18, 28, 0.78);
  --line: rgba(212, 244, 82, 0.18);
  --text: #eef2e6;
  --muted: rgba(226, 232, 208, 0.62);
  --lime: #d4f452;
  --lime-dim: #b6d63a;
  --danger: #fb7185;
  --radius: 16px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
}

.bg {
  position: fixed;
  inset: 0;
  background:
    radial-gradient(900px 420px at 12% -10%, rgba(212, 244, 82, 0.16), transparent 55%),
    radial-gradient(700px 500px at 90% 10%, rgba(94, 234, 212, 0.1), transparent 50%),
    linear-gradient(180deg, #0b1018 0%, #07090d 100%);
  pointer-events: none;
}

.shell {
  position: relative;
  width: min(440px, calc(100% - 40px));
  margin: 0 auto;
  padding: 72px 0 48px;
}

.kicker {
  margin: 0 0 10px;
  color: var(--lime);
  font-size: 12px;
  letter-spacing: 0.22em;
}

h1 {
  margin: 0 0 10px;
  font-size: clamp(28px, 6vw, 36px);
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.lead, .foot {
  color: var(--muted);
  line-height: 1.6;
  font-size: 14px;
}

.card {
  display: grid;
  gap: 16px;
  margin-top: 28px;
  padding: 24px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.28);
  backdrop-filter: blur(16px);
}

label {
  display: grid;
  gap: 8px;
  font-size: 13px;
  color: var(--muted);
}

input {
  width: 100%;
  height: 46px;
  padding: 0 14px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  background: rgba(8, 10, 16, 0.72);
  color: var(--text);
  font: inherit;
  outline: none;
}

input:focus {
  border-color: rgba(212, 244, 82, 0.55);
  box-shadow: 0 0 0 3px rgba(212, 244, 82, 0.12);
}

.code-fields {
  display: flex;
  gap: 8px;
}

.code-fields input { flex: 1; }

button {
  height: 46px;
  border: 0;
  border-radius: 12px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.primary {
  background: var(--lime);
  color: #14180c;
}

.primary:hover { background: var(--lime-dim); }
.primary:disabled, .ghost:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.ghost {
  flex: 0 0 118px;
  background: rgba(212, 244, 82, 0.1);
  color: var(--lime);
}

.hint {
  min-height: 20px;
  margin: 0;
  font-size: 13px;
  color: var(--muted);
}

.hint.is-error { color: var(--danger); }
.hint.is-ok { color: var(--lime); }

.foot { margin-top: 22px; }

@media (max-width: 480px) {
  .shell { padding-top: 40px; }
  .code-fields { flex-direction: column; }
  .ghost { flex-basis: auto; width: 100%; }
}