:root {
  --bg: #081018;
  --panel: #101922;
  --line: rgba(140, 188, 220, 0.18);
  --text: #e8f2f8;
  --muted: #8aa0b0;
  --steam: #66c0f4;
  --green: #8bc53f;
  --danger: #ff7b72;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(900px 500px at 10% -10%, rgba(102, 192, 244, 0.16), transparent 55%),
    radial-gradient(700px 420px at 100% 0%, rgba(139, 197, 63, 0.08), transparent 50%),
    var(--bg);
}

.lang-switch {
  position: fixed;
  top: 18px;
  right: 18px;
  z-index: 5;
  display: flex;
  gap: 6px;
}
.lang-switch button {
  border: 1px solid var(--line);
  background: rgba(16, 25, 34, 0.9);
  color: var(--muted);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 12px;
  cursor: pointer;
}
.lang-switch button.active,
.lang-switch button:hover {
  color: var(--text);
  border-color: var(--steam);
  background: rgba(102, 192, 244, 0.12);
}

.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(102, 192, 244, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(102, 192, 244, 0.05) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: radial-gradient(circle at 30% 20%, black, transparent 75%);
  pointer-events: none;
}

.shell {
  position: relative;
  max-width: 1080px;
  margin: 0 auto;
  padding: 72px 24px;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 420px);
  gap: 40px;
  align-items: center;
}

.eyebrow {
  letter-spacing: 0.22em;
  color: var(--steam);
  font-size: 12px;
  margin: 0 0 16px;
}
h1 {
  font-size: 42px;
  line-height: 1.15;
  margin: 0 0 18px;
  font-weight: 700;
}
.lead, .points, .hint, .uid, .state p { color: var(--muted); }
.points {
  padding-left: 18px;
  line-height: 1.9;
}

.panel {
  background: linear-gradient(180deg, rgba(22, 34, 45, 0.95), rgba(12, 20, 28, 0.95));
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 32px;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
  min-height: 360px;
}
.hidden { display: none !important; }
.state h2 { margin: 0 0 12px; font-size: 26px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border: 0;
  border-radius: 10px;
  padding: 12px 18px;
  font-size: 15px;
  font-weight: 650;
  cursor: pointer;
  text-decoration: none;
  color: #081018;
}
.btn svg { width: 18px; height: 18px; }
.btn.steam { background: var(--steam); width: 100%; margin-top: 22px; }
.btn.primary { background: var(--green); }
.btn.ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--line);
}
.btn:disabled { opacity: 0.6; cursor: not-allowed; }

.profile {
  display: flex;
  gap: 14px;
  align-items: center;
  margin-bottom: 24px;
}
.profile img {
  width: 64px;
  height: 64px;
  border-radius: 14px;
  object-fit: cover;
  background: #1b2838;
  border: 1px solid var(--line);
}
.name { margin: 0; font-size: 20px; font-weight: 700; }
.uid { margin: 6px 0 8px; font-size: 13px; }
.badge {
  display: inline-block;
  margin: 0;
  padding: 3px 8px;
  border-radius: 999px;
  font-size: 12px;
  background: rgba(102, 192, 244, 0.12);
  color: var(--steam);
}
.badge.set { background: rgba(139, 197, 63, 0.14); color: var(--green); }

form { display: grid; gap: 12px; }
label { display: grid; gap: 6px; font-size: 13px; color: var(--muted); }
input {
  width: 100%;
  border: 1px solid var(--line);
  background: #0b141c;
  color: var(--text);
  border-radius: 10px;
  padding: 11px 12px;
  font-size: 15px;
}
input:focus {
  outline: 2px solid rgba(102, 192, 244, 0.35);
  border-color: var(--steam);
}
.actions { display: flex; gap: 10px; }
.actions .btn { flex: 1; }
.msg { min-height: 20px; margin: 0; font-size: 14px; }
.msg.ok { color: var(--green); }
.msg.err { color: var(--danger); }

@media (max-width: 860px) {
  .shell { grid-template-columns: 1fr; padding: 36px 16px 64px; }
  h1 { font-size: 32px; }
}