:root {
  --bg: #0f1419;
  --card: #1a2332;
  --border: #2d3a4f;
  --text: #e8edf4;
  --muted: #8b9cb3;
  --primary: #1677ff;
  --primary-hover: #4096ff;
  --success: #52c41a;
  --danger: #ff4d4f;
  --warning: #faad14;
  --alipay: #1677ff;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
}

a {
  color: var(--primary);
}

.shell {
  max-width: 960px;
  margin: 0 auto;
  padding: 1.25rem;
}

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.logo {
  font-size: 1.25rem;
  font-weight: 600;
}

.logo span {
  color: var(--alipay);
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
}

.tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.tab {
  flex: 1;
  padding: 0.75rem;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  border-radius: 8px;
  cursor: pointer;
  font-size: 1rem;
}

.tab.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.amount-display {
  font-size: 2.75rem;
  font-weight: 700;
  text-align: right;
  padding: 0.75rem 1rem;
  background: #0d1117;
  border-radius: 8px;
  margin-bottom: 1rem;
  font-variant-numeric: tabular-nums;
}

.amount-display .prefix {
  font-size: 1.5rem;
  color: var(--muted);
  margin-right: 0.25rem;
}

.keypad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
}

.keypad button {
  padding: 1.1rem;
  font-size: 1.35rem;
  border: 1px solid var(--border);
  background: #243044;
  color: var(--text);
  border-radius: 8px;
  cursor: pointer;
}

.keypad button:active {
  transform: scale(0.98);
}

.keypad .action {
  background: #2a3548;
  color: var(--warning);
}

.keypad .primary {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  grid-column: span 3;
  font-size: 1.2rem;
  padding: 1rem;
}

.field {
  margin-bottom: 1rem;
}

.field label {
  display: block;
  margin-bottom: 0.35rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.field input,
.field textarea,
.field select {
  width: 100%;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #0d1117;
  color: var(--text);
  font-size: 1rem;
}

.field textarea {
  min-height: 100px;
  font-family: ui-monospace, monospace;
  font-size: 0.85rem;
}

.status {
  text-align: center;
  padding: 1.5rem;
  border-radius: 8px;
  margin-top: 1rem;
}

.status.success {
  background: rgba(82, 196, 26, 0.15);
  color: var(--success);
}

.status.error {
  background: rgba(255, 77, 79, 0.15);
  color: var(--danger);
}

.status.pending {
  background: rgba(250, 173, 20, 0.15);
  color: var(--warning);
}

.qr-box {
  text-align: center;
  padding: 1rem;
}

.qr-box img {
  max-width: 280px;
  border-radius: 8px;
  background: #fff;
  padding: 8px;
}

.btn {
  display: inline-block;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  font-size: 0.95rem;
  background: var(--primary);
  color: #fff;
}

.btn.secondary {
  background: #2a3548;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

th,
td {
  padding: 0.6rem 0.5rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
}

th {
  color: var(--muted);
  font-weight: 500;
}

.badge {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-size: 0.8rem;
}

.badge.success {
  background: rgba(82, 196, 26, 0.2);
  color: var(--success);
}

.badge.pending {
  background: rgba(250, 173, 20, 0.2);
  color: var(--warning);
}

.badge.failed {
  background: rgba(255, 77, 79, 0.2);
  color: var(--danger);
}

.hint {
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 0.5rem;
}

.login-box {
  max-width: 360px;
  margin: 4rem auto;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 640px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }

  .amount-display {
    font-size: 2rem;
  }
}