:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --text: #1c1f23;
  --muted: #6b7280;
  --line: #e5e7eb;
  --brand: #2f6bff;
  --brand-dark: #1f4fd8;
  --ok: #16a34a;
  --warn: #d97706;
  --err: #dc2626;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}
.wrap { max-width: 560px; margin: 0 auto; padding: 32px 16px 64px; }
.wrap.wide { max-width: 960px; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 24px;
  box-shadow: 0 1px 3px rgba(16, 24, 40, .04);
}
.card.center { text-align: center; }
h1 { font-size: 22px; margin: 0 0 6px; }
h2 { font-size: 15px; margin: 20px 0 8px; }
.meta { color: var(--muted); margin: 0 0 12px; }
.quota { color: var(--muted); font-size: 13px; margin: 0 0 18px; }

.step { display: flex; gap: 12px; padding: 14px 0; border-top: 1px solid var(--line); }
.step-num {
  flex: 0 0 26px; height: 26px; border-radius: 50%;
  background: var(--brand); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 600;
}
.step-body { flex: 1; }
.step-body h2 { margin: 0 0 4px; }
.step-body p { margin: 0 0 10px; color: var(--muted); }
.tip { font-size: 12px; color: var(--warn); }

.btn {
  display: inline-block; padding: 10px 18px; border-radius: 10px;
  background: var(--brand); color: #fff; text-decoration: none; font-weight: 500;
}
.btn:hover { background: var(--brand-dark); }
.btn.ghost { background: #fff; color: var(--brand); border: 1px solid var(--line); }

.alert {
  background: #fef2f2; border: 1px solid #fecaca; color: var(--err);
  padding: 10px 12px; border-radius: 10px; margin: 12px 0; font-size: 13px;
  word-break: break-all; text-align: left;
}

details.faq { border-top: 1px solid var(--line); padding: 10px 0; }
details.faq summary { cursor: pointer; color: var(--muted); font-size: 13px; }
details.faq p { color: var(--muted); font-size: 13px; margin: 8px 0 0; }

.qr { text-align: center; margin-top: 20px; color: var(--muted); font-size: 12px; }
.qr img { border: 1px solid var(--line); border-radius: 10px; }

.spinner {
  width: 34px; height: 34px; margin: 8px auto 16px;
  border: 3px solid var(--line); border-top-color: var(--brand);
  border-radius: 50%; animation: spin .9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.progress { height: 6px; background: var(--line); border-radius: 999px; overflow: hidden; margin-top: 16px; }
.progress .bar { height: 100%; width: 5%; background: var(--brand); transition: width .4s ease; }

.grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin: 16px 0 8px; }
.stat { border: 1px solid var(--line); border-radius: 10px; padding: 12px; text-align: center; }
.stat span { display: block; color: var(--muted); font-size: 12px; }
.stat b { font-size: 20px; }

.upload { display: flex; gap: 10px; margin: 12px 0 20px; }
.upload button {
  padding: 8px 16px; border: 0; border-radius: 8px;
  background: var(--brand); color: #fff; cursor: pointer;
}

.table-scroll { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); }
th { color: var(--muted); font-weight: 500; }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12px; }
.tag { padding: 2px 8px; border-radius: 999px; font-size: 12px; }
.tag.registered { background: #dcfce7; color: var(--ok); }
.tag.pending { background: #fef9c3; color: var(--warn); }
.tag.failed { background: #fee2e2; color: var(--err); }

@media (max-width: 480px) {
  .grid { grid-template-columns: repeat(2, 1fr); }
}