:root {
  --bg-1: #0b1020; --bg-2: #141a33;
  --accent: #6c8cff; --accent-2: #9d6cff; --accent-3: #4dd6c7;
  --text: #eef1fa; --muted: #8b94b8;
  --card: rgba(255,255,255,.05); --card-border: rgba(255,255,255,.09);
  --danger: #ff6b6b; --warn: #ffb454; --ok: #5ee6a0;
}
* { margin:0; padding:0; box-sizing:border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  min-height: 100vh; color: var(--text);
  background: radial-gradient(1200px 800px at 15% -10%, #1c2450 0%, transparent 60%),
              radial-gradient(1000px 700px at 110% 20%, #201a45 0%, transparent 55%),
              radial-gradient(900px 700px at 50% 120%, #0e2b34 0%, transparent 60%),
              linear-gradient(160deg, var(--bg-1), var(--bg-2));
  background-attachment: fixed; overflow-x: hidden;
}
.stars { position: fixed; inset:0; pointer-events:none; z-index:0; }
.star { position:absolute; border-radius:50%; background:#fff; opacity:.5; animation: twinkle 4s infinite ease-in-out; }
@keyframes twinkle { 0%,100% {opacity:.15;} 50% {opacity:.7;} }
.wrap { position:relative; z-index:1; max-width: 680px; margin: 0 auto; padding: 56px 20px 70px; }
header { text-align:center; margin-bottom: 32px; position:relative; animation: rise .6s ease both; }
@keyframes rise { from {opacity:0; transform:translateY(14px);} to {opacity:1; transform:none;} }
.back {
  position:absolute; left:0; top:8px; color:var(--muted); text-decoration:none;
  font-size:13.5px; padding:8px 14px; border-radius:10px;
  background: rgba(255,255,255,.05); border:1px solid rgba(255,255,255,.1); transition:.2s;
}
.back:hover { color:var(--text); border-color: var(--accent); }
.logo {
  width:64px; height:64px; margin:0 auto 18px; border-radius:20px;
  background: linear-gradient(135deg, var(--accent-3), var(--accent));
  display:flex; align-items:center; justify-content:center; font-size:30px;
  box-shadow: 0 10px 40px rgba(77,214,199,.3);
}
header h1 { font-size:28px; background:linear-gradient(90deg,#fff,#b9c8ff); -webkit-background-clip:text; background-clip:text; -webkit-text-fill-color:transparent; }
header p { color:var(--muted); font-size:14px; margin-top:8px; }
.card {
  background: var(--card); border: 1px solid var(--card-border); border-radius: 20px;
  padding: 26px; backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 12px 40px rgba(0,0,0,.25); margin-bottom: 22px; animation: rise .6s ease both;
}
.card:nth-child(2) { animation-delay:.08s; }
.card:nth-child(3) { animation-delay:.16s; }
.card.success { text-align:center; }
.input-row { display:flex; gap:10px; }
.input-wrap { flex:1; position:relative; }
.input-wrap .lock { position:absolute; left:16px; top:50%; transform:translateY(-50%); font-size:15px; opacity:.55; pointer-events:none; }
input[type=text] {
  width:100%; padding:14px 16px 14px 42px; background: rgba(255,255,255,.06);
  border: 1.5px solid rgba(255,255,255,.12); border-radius: 14px; color: var(--text);
  font-size:14px; font-family:ui-monospace,monospace; outline:none; transition:.2s;
}
input[type=text]:focus { border-color: var(--accent); background: rgba(108,140,255,.08); box-shadow: 0 0 0 4px rgba(108,140,255,.15); }
.btn {
  padding: 14px 22px; border:none; border-radius:14px; cursor:pointer; font-size:14px;
  font-weight:600; color:#fff; font-family:inherit;
  background: linear-gradient(135deg, var(--accent-3), var(--accent)); transition:.2s; white-space:nowrap;
}
.btn:hover { transform: translateY(-1px); box-shadow: 0 8px 24px rgba(108,140,255,.35); }
.btn:disabled { opacity:.6; cursor:wait; transform:none; }
.btn-sm { padding: 8px 16px; font-size:13px; }
.btn-block { display:block; width:100%; }
#error { display:none; margin-top:14px; padding:12px 16px; border-radius:12px; background: rgba(255,107,107,.12); border:1px solid rgba(255,107,107,.3); color:var(--danger); font-size:13.5px; }
#result { display:none; }
.success-icon { font-size:46px; margin-bottom:10px; }
.accent { color: var(--accent-3); }
.key-box {
  display:flex; align-items:center; gap:10px; margin:18px auto; max-width:100%;
  background: rgba(0,0,0,.35); border:1px solid rgba(108,140,255,.3); border-radius:12px; padding:12px 16px;
}
.key-box span { flex:1; font-family:ui-monospace,monospace; font-size:13px; word-break:break-all; text-align:left; color:#b9c8ff; }
.warn-box { background: rgba(255,180,84,.1); border:1px solid rgba(255,180,84,.3); color:var(--warn); border-radius:12px; padding:12px 16px; font-size:13px; margin-bottom:18px; }
.grid { display:grid; grid-template-columns: 1fr 1fr; gap:14px; text-align:left; }
@media (max-width:560px){ .grid { grid-template-columns:1fr; } }
.stat { background: rgba(255,255,255,.04); border:1px solid rgba(255,255,255,.08); border-radius:14px; padding:14px 16px; }
.stat .label { color:var(--muted); font-size:12px; margin-bottom:6px; }
.stat .value { font-size:20px; font-weight:700; }
.stat .value small { font-size:12px; color:var(--muted); font-weight:400; }
.chips { display:flex; flex-wrap:wrap; gap:6px; margin-top:6px; }
.chip { font-size:11.5px; background: rgba(108,140,255,.1); border:1px solid rgba(108,140,255,.25); color:#b9c8ff; border-radius:999px; padding:3px 10px; }
.foot { text-align:center; color:var(--muted); font-size:12px; margin-top:30px; line-height:1.9; opacity:.75; }