:root {
  --bg: #f4f6f9;
  --card: #ffffff;
  --ink: #1f2933;
  --muted: #6b7280;
  --line: #e5e7eb;
  --primary: #2563eb;
  --primary-ink: #ffffff;
  --danger: #dc2626;
  --ok: #16a34a;
  --warn: #d97706;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", "Malgun Gothic", system-ui, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
}

.container {
  max-width: 920px;
  margin: 0 auto;
  padding: 24px 16px 64px;
}

.narrow { max-width: 460px; margin-left: auto; margin-right: auto; }

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 16px;
}
.topbar h1 { font-size: 1.4rem; margin: 0; }
.topbar-right { display: flex; align-items: center; gap: 12px; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 18px;
  box-shadow: 0 1px 2px rgba(0,0,0,.04);
}
.card h1 { margin-top: 0; }
.card h2 { margin: 0 0 14px; font-size: 1.1rem; }

.form { display: flex; flex-direction: column; gap: 12px; }
.form.grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}
.form.grid button { grid-column: 1 / -1; }
label { display: flex; flex-direction: column; gap: 4px; font-size: .9rem; color: var(--muted); }
input[type=text], input[type=password], input[type=number] {
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 1rem;
  background: #fff;
  color: var(--ink);
}
input:focus { outline: 2px solid var(--primary); border-color: var(--primary); }

.btn {
  display: inline-block;
  padding: 9px 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  font-size: .95rem;
  cursor: pointer;
  text-decoration: none;
  text-align: center;
}
.btn:hover { background: #f9fafb; }
.btn.primary { background: var(--primary); color: var(--primary-ink); border-color: var(--primary); }
.btn.primary:hover { filter: brightness(.95); }
.btn.danger { background: var(--danger); color: #fff; border-color: var(--danger); }
.btn.ghost { background: transparent; }
.btn.small { padding: 5px 10px; font-size: .85rem; }
.btn.block { width: 100%; padding: 13px; font-size: 1.05rem; }
.inline { display: inline; }

.table { width: 100%; border-collapse: collapse; font-size: .92rem; }
.table th, .table td { padding: 9px 10px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.table th { color: var(--muted); font-weight: 600; }
.table .num, .table .nowrap { white-space: nowrap; }
.table .num { text-align: right; font-variant-numeric: tabular-nums; }

.badge {
  display: inline-block; padding: 2px 8px; border-radius: 999px;
  font-size: .78rem; background: #eef2f7; color: #334155; border: 1px solid var(--line);
}
.status-READY { background: #e0edff; color: #1d4ed8; border-color: #bfdbfe; }
.status-PAID { background: #dcfce7; color: #15803d; border-color: #bbf7d0; }
.status-CANCELLED { background: #fee2e2; color: #b91c1c; border-color: #fecaca; }
.status-EXPIRED { background: #f3f4f6; color: #6b7280; }
.status-FAILED { background: #fee2e2; color: #b91c1c; border-color: #fecaca; }

.mode-badge { padding: 4px 10px; border-radius: 999px; font-size: .8rem; }
.mode-mock { background: #fef3c7; color: #92400e; }
.mode-real { background: #dcfce7; color: #166534; }

.alert { padding: 10px 12px; border-radius: 8px; font-size: .9rem; }
.alert.error { background: #fee2e2; color: #b91c1c; }
.alert.info { background: #eff6ff; color: #1e40af; }

.muted { color: var(--muted); }
.center { text-align: center; }
.mono, .raw { font-family: "Consolas", "D2Coding", monospace; }
.raw { font-size: .8rem; color: #475569; white-space: pre-wrap; word-break: break-all; }

.kv { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px 24px; }
.kv > div { display: flex; flex-direction: column; }
.kv span { font-size: .8rem; color: var(--muted); }
.kv strong { font-weight: 600; word-break: break-all; }

.copy-row { display: flex; gap: 8px; }
.copy-row input { flex: 1; }

.pay-box .pay-summary { margin: 18px 0; }
.pay-summary .row { display: flex; justify-content: space-between; padding: 8px 0; border-bottom: 1px dashed var(--line); }
.pay-summary .row.total strong { font-size: 1.3rem; color: var(--primary); }

.result-icon {
  width: 64px; height: 64px; line-height: 64px; margin: 0 auto 12px;
  border-radius: 50%; font-size: 2rem; color: #fff;
}
.result-icon.ok { background: var(--ok); }
.result-icon.warn { background: var(--warn); }

.danger-zone { border-color: #fecaca; }

.site-footer { text-align: center; color: var(--muted); padding: 24px 0; }

@media (max-width: 560px) {
  .form.grid { grid-template-columns: 1fr; }
  .kv { grid-template-columns: 1fr; }
}