:root {
  --bg: #060912;
  --panel: rgba(16, 22, 40, 0.55);
  --border: rgba(120, 160, 255, 0.16);
  --text: #e6edf7;
  --muted: #8b9bb8;
  --cyan: #22d3ee;
  --violet: #a855f7;
  --blue: #6366f1;
  --ok: #34d399;
  --warn: #fbbf24;
  --grad: linear-gradient(135deg, #22d3ee, #6366f1 52%, #a855f7);
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: "Rajdhani", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  color: var(--text);
  background-color: var(--bg);
  background-image:
    radial-gradient(1100px 560px at 82% -12%, rgba(168, 85, 247, 0.20), transparent 60%),
    radial-gradient(900px 520px at -5% 8%, rgba(34, 211, 238, 0.16), transparent 55%);
  background-attachment: fixed;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}
body::before {
  content: ""; position: fixed; inset: 0; z-index: -2; pointer-events: none;
  background-image:
    linear-gradient(rgba(120, 160, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120, 160, 255, 0.05) 1px, transparent 1px);
  background-size: 46px 46px;
  -webkit-mask-image: radial-gradient(circle at 50% 26%, #000, transparent 78%);
  mask-image: radial-gradient(circle at 50% 26%, #000, transparent 78%);
}
body::after {
  content: ""; position: fixed; width: 560px; height: 560px; border-radius: 50%;
  background: radial-gradient(circle, rgba(34, 211, 238, 0.16), transparent 60%);
  top: -180px; right: -120px; filter: blur(40px); z-index: -1; pointer-events: none;
  animation: drift 16s ease-in-out infinite;
}
@keyframes drift { 50% { transform: translate(-70px, 80px) scale(1.1); } }

.orb { position: fixed; border-radius: 50%; filter: blur(60px); z-index: -1; pointer-events: none; }
.orb-violet {
  width: 480px; height: 480px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.18), transparent 60%);
  bottom: -160px; left: -120px; animation: drift2 18s ease-in-out infinite;
}
@keyframes drift2 { 50% { transform: translate(60px, -50px); } }

.wrap { max-width: 920px; margin: 0 auto; padding: 56px 16px 64px; position: relative; z-index: 1; }

.hero { text-align: center; margin-bottom: 30px; }
.kicker {
  display: inline-block; font-size: 12px; letter-spacing: 3px; text-transform: uppercase;
  color: #9fb3d9; border: 1px solid var(--border); background: rgba(255, 255, 255, 0.03);
  padding: 6px 16px; border-radius: 999px; margin-bottom: 16px;
}
.hero h1 {
  font-family: "Orbitron", "Rajdhani", system-ui, sans-serif;
  font-size: 40px; margin: 0 0 8px; font-weight: 700; letter-spacing: 1px;
  background: linear-gradient(135deg, #7dd3fc, #a855f7);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  text-shadow: 0 0 36px rgba(124, 58, 237, 0.22);
}
.hero .sub { color: var(--muted); margin: 0; font-size: 15px; letter-spacing: 1px; }

.pay-methods { display: flex; align-items: center; gap: 14px; justify-content: center; flex-wrap: wrap; margin: 0 0 26px; }
.pm-label { color: var(--muted); font-size: 14px; letter-spacing: 1px; }
.pm {
  display: inline-flex; align-items: center; gap: 7px; font-size: 14px; cursor: pointer;
  background: var(--panel); border: 1px solid var(--border); color: var(--text);
  padding: 8px 16px; border-radius: 999px; backdrop-filter: blur(10px); transition: .18s;
}
.pm:hover { border-color: rgba(34, 211, 238, 0.4); }
.pm:has(input:checked) { border-color: rgba(34, 211, 238, 0.65); box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.12); color: #cffafe; }
.pm input { accent-color: var(--cyan); }

.plans { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
@media (max-width: 760px) { .plans { grid-template-columns: 1fr; } }

.plan {
  position: relative; background: var(--panel); border: 1px solid var(--border);
  border-radius: 18px; padding: 26px 18px; text-align: center;
  display: flex; flex-direction: column; gap: 8px; backdrop-filter: blur(14px);
  box-shadow: 0 12px 34px rgba(0, 0, 0, 0.4); transition: .22s; overflow: hidden;
}
.plan::before {
  content: ""; position: absolute; inset: 0; border-radius: 18px; padding: 1px;
  background: linear-gradient(140deg, rgba(34, 211, 238, 0.4), rgba(168, 85, 247, 0.4));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude;
  opacity: 0; transition: .22s; pointer-events: none;
}
.plan:hover { transform: translateY(-7px); box-shadow: 0 22px 54px rgba(34, 211, 238, 0.18); }
.plan:hover::before { opacity: 1; }
.plan.hot { border-color: rgba(168, 85, 247, 0.45); box-shadow: 0 16px 46px rgba(168, 85, 247, 0.22); }
.plan.hot::before { opacity: 1; background: linear-gradient(140deg, var(--cyan), var(--violet)); }
.badge {
  position: absolute; top: -11px; left: 50%; transform: translateX(-50%);
  background: var(--grad); color: #fff; font-size: 12px; font-weight: 600; letter-spacing: 1px;
  padding: 3px 14px; border-radius: 999px; box-shadow: 0 6px 18px rgba(168, 85, 247, 0.4);
}
.plan h2 { margin: 6px 0 0; font-size: 19px; font-weight: 600; letter-spacing: 1px; }
.price {
  margin: 6px 0; font-size: 38px; font-weight: 800; font-family: "Orbitron", system-ui, sans-serif;
  background: linear-gradient(135deg, #67e8f9, #c4b5fd);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.price .cur { font-size: 18px; vertical-align: super; margin-right: 2px; }
.price .unit { font-size: 13px; font-weight: 400; color: var(--muted); margin-left: 4px; -webkit-text-fill-color: var(--muted); }
.desc { color: var(--muted); font-size: 13px; min-height: 34px; letter-spacing: .5px; }
.buy {
  margin-top: 10px; border: none; color: #fff; font-size: 15px; font-weight: 600; letter-spacing: 1px;
  padding: 12px 0; border-radius: 12px; cursor: pointer;
  background: var(--grad); background-size: 180% 180%; box-shadow: 0 8px 24px rgba(99, 102, 241, 0.35); transition: .2s;
}
.buy:hover { transform: translateY(-2px); box-shadow: 0 12px 34px rgba(168, 85, 247, 0.55); background-position: 100% 0; }
.buy:disabled { opacity: .6; cursor: default; transform: none; }

.result { text-align: center; }
.loading { padding: 54px 0; color: var(--muted); letter-spacing: 1px; }
.spinner {
  width: 36px; height: 36px; margin: 0 auto 18px; border-radius: 50%;
  border: 3px solid rgba(34, 211, 238, 0.2); border-top-color: var(--cyan);
  animation: spin 1s linear infinite; box-shadow: 0 0 18px rgba(34, 211, 238, 0.3);
}
@keyframes spin { to { transform: rotate(360deg); } }

.done { padding: 30px 0; }
.done h2 {
  font-size: 26px; margin: 0 0 10px; font-family: "Orbitron", system-ui, sans-serif;
  background: linear-gradient(135deg, #6ee7b7, #22d3ee);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.tip { color: var(--muted); font-size: 14px; }
.code-box {
  display: inline-flex; align-items: center; gap: 12px; margin: 16px 0;
  background: rgba(34, 211, 238, 0.06); border: 1px dashed rgba(34, 211, 238, 0.45);
  padding: 14px 16px; border-radius: 12px; box-shadow: 0 0 26px rgba(34, 211, 238, 0.12) inset;
}
.code-box code { font-size: 19px; letter-spacing: 1.5px; color: #67e8f9; word-break: break-all; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.copy {
  border: 1px solid rgba(34, 211, 238, 0.5); background: transparent; color: #67e8f9;
  padding: 7px 14px; border-radius: 8px; cursor: pointer; font-size: 13px; transition: .18s;
}
.copy:hover { background: rgba(34, 211, 238, 0.12); }
.warn { color: var(--warn); font-size: 13px; }
.back { display: inline-block; margin-top: 16px; color: #9fd8ff; text-decoration: none; font-size: 14px; letter-spacing: 1px; }
.back:hover { text-decoration: underline; }

.foot { text-align: center; color: var(--muted); font-size: 12px; margin-top: 44px; letter-spacing: .5px; }
.foot a { color: var(--muted); }
.foot a:hover { color: var(--cyan); }
.hidden { display: none !important; }

/* ---- admin console ---- */
.card-box {
  max-width: 440px; margin: 0 auto; background: var(--panel); border: 1px solid var(--border);
  border-radius: 18px; padding: 26px; backdrop-filter: blur(14px); box-shadow: 0 12px 34px rgba(0, 0, 0, 0.4);
}
.card-box h2 { margin: 0 0 18px; font-size: 19px; font-weight: 600; letter-spacing: 1px; }
.card-box input[type="password"] {
  width: 100%; padding: 12px; background: rgba(8, 12, 22, 0.7); border: 1px solid var(--border);
  border-radius: 10px; font-size: 15px; color: var(--text); margin-bottom: 14px;
}
.card-box input::placeholder { color: #5b6b8a; }
.row { display: flex; gap: 10px; margin-bottom: 18px; }
.ghost {
  border: 1px solid var(--border); background: rgba(255, 255, 255, 0.03); color: var(--text);
  padding: 9px 16px; border-radius: 9px; cursor: pointer; font-size: 14px; transition: .18s;
}
.ghost:hover { border-color: rgba(34, 211, 238, 0.5); }
.ghost.danger { color: #fca5a5; border-color: rgba(248, 113, 113, 0.4); }
.mt { margin-top: 28px; }
.field { display: block; font-size: 14px; color: var(--muted); margin-bottom: 8px; }
.field select {
  margin-left: 8px; padding: 8px 10px; background: rgba(8, 12, 22, 0.7);
  border: 1px solid var(--border); border-radius: 8px; color: var(--text); font-size: 14px;
}
.hint { color: var(--muted); font-size: 13px; margin: 0 0 10px; }
textarea#codes {
  width: 100%; min-height: 170px; padding: 12px; background: rgba(8, 12, 22, 0.7);
  border: 1px solid var(--border); border-radius: 10px; color: var(--text);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 14px; resize: vertical;
}
textarea#codes:focus, .card-box input:focus, .field select:focus {
  outline: 2px solid rgba(34, 211, 238, 0.3); border-color: var(--cyan);
}
.inv { display: flex; flex-direction: column; gap: 10px; }
.inv-item {
  display: flex; justify-content: space-between; align-items: center;
  background: var(--panel); border: 1px solid var(--border); border-radius: 10px; padding: 13px 15px; backdrop-filter: blur(10px);
}
.inv-name { font-weight: 600; }
.inv-num { color: var(--muted); font-size: 14px; }
.inv-num b { color: var(--ok); }
.tip.ok { color: var(--ok); }
.tip.warn { color: var(--warn); }