:root {
  --bg: #f4f6f9;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --ok: #16a34a;
  --err: #dc2626;
  --warn: #f59e0b;
  --border: #e5e7eb;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #111827;
  color: #fff;
  padding: 0 24px;
  height: 56px;
}

.nav .brand { font-weight: 700; font-size: 18px; }

.nav nav { display: flex; gap: 18px; align-items: center; }
.nav a { color: #d1d5db; text-decoration: none; font-size: 14px; }
.nav-user { color: #9ca3af; font-size: 13px; max-width: 240px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.nav a:hover { color: #fff; }

.container { max-width: 1080px; margin: 28px auto; padding: 0 16px; }

h1 { font-size: 24px; margin: 8px 0 20px; }
h2 { font-size: 17px; margin: 0 0 12px; }
h3 { font-size: 14px; margin: 18px 0 8px; color: var(--muted); }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  margin-bottom: 16px;
}

.card.narrow { max-width: 420px; margin: 40px auto; }

.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 800px) { .grid { grid-template-columns: 1fr; } }

label { display: block; font-size: 14px; margin-bottom: 12px; color: var(--muted); }

input, select {
  display: block;
  width: 100%;
  margin-top: 4px;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 7px;
  font-size: 14px;
  background: #fff;
  color: var(--text);
}

input:focus, select:focus { outline: 2px solid #bfdbfe; border-color: var(--primary); }

.narrow-input { max-width: 90px; }

input[type="checkbox"] {
  display: inline-block;
  width: 20px;
  height: 20px;
  margin-top: 0;
  padding: 0;
  cursor: pointer;
  accent-color: var(--primary);
}

td input[type="checkbox"] { vertical-align: middle; }

.row { display: flex; gap: 10px; align-items: flex-end; flex-wrap: wrap; }
.row input, .row select { width: auto; flex: 1; min-width: 120px; margin-top: 0; }
.row label { flex: 1; margin-bottom: 0; }

.btn {
  display: inline-block;
  padding: 9px 18px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: #fff;
  color: var(--text);
  font-size: 14px;
  cursor: pointer;
  text-decoration: none;
}
.btn:hover { background: #f9fafb; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-hover); }
.btn.small { padding: 4px 12px; font-size: 13px; }
.btn.block { width: 100%; margin-top: 4px; }

.linklike {
  background: none;
  border: none;
  color: #d1d5db;
  font-size: 14px;
  cursor: pointer;
  padding: 0;
}
.linklike:hover { color: #fff; }

.inline { display: inline; }

.alert { padding: 10px 16px; border-radius: 8px; margin-bottom: 16px; font-size: 14px; }
.alert.ok { background: #dcfce7; color: #166534; border: 1px solid #bbf7d0; }
.alert.err { background: #fee2e2; color: #991b1b; border: 1px solid #fecaca; }

.muted { color: var(--muted); font-size: 13px; }
.center { text-align: center; }

.progress {
  background: #e5e7eb;
  border-radius: 99px;
  height: 12px;
  overflow: hidden;
  margin: 10px 0;
}
.progress .bar { height: 100%; background: var(--primary); border-radius: 99px; transition: width .3s; }
.progress .bar.warn { background: var(--warn); }
.progress .bar.danger { background: var(--err); }

.usage { font-size: 15px; margin: 6px 0; }

.subbox {
  background: #f9fafb;
  border: 1px dashed var(--border);
  border-radius: 8px;
  padding: 12px;
  margin-top: 14px;
}
.sublabel { font-size: 12px; color: var(--muted); margin-bottom: 6px; }
.subbox code {
  display: block;
  font-size: 12px;
  word-break: break-all;
  background: #fff;
  border: 1px solid var(--border);
  padding: 8px;
  border-radius: 6px;
  margin-bottom: 8px;
}

.stats { display: grid; grid-template-columns: repeat(6, 1fr); gap: 12px; margin-bottom: 16px; }
@media (max-width: 900px) { .stats { grid-template-columns: repeat(3, 1fr); } }
.card.stat { text-align: center; padding: 14px 8px; margin-bottom: 0; }
.card.stat .num { font-size: 26px; font-weight: 700; color: var(--primary); }
.card.stat .lbl { font-size: 12px; color: var(--muted); }

table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 600; font-size: 12px; }
tr:last-child td { border-bottom: none; }

code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; }

.tag {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 99px;
  font-size: 12px;
}
.tag.active { background: #dcfce7; color: #166534; }
.tag.disabled { background: #f3f4f6; color: #6b7280; }
.tag.depleted { background: #fee2e2; color: #991b1b; }
.tag.expired { background: #fef3c7; color: #92400e; }

.buy-cell form { display: inline-block; margin-right: 4px; }

.paybox {
  background: #f9fafb;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 18px;
  max-width: 560px;
}
.payrow {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 8px;
}
.payrow .big { font-size: 22px; color: var(--text); }
.qrwrap { text-align: center; margin: 14px 0; }
.qrwrap img {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px;
}
.paybox code {
  display: block;
  font-size: 12px;
  word-break: break-all;
  background: #fff;
  border: 1px solid var(--border);
  padding: 8px;
  border-radius: 6px;
  margin-bottom: 8px;
}
.steps { font-size: 13px; color: var(--muted); padding-left: 20px; margin: 14px 0 0; }
.steps li { margin-bottom: 6px; }
.steps strong { color: var(--err); }