:root {
  --bg: #f4f6f8;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #0f766e;
  --primary-dark: #115e59;
  --danger: #b91c1c;
  --success: #15803d;
  --warning: #b45309;
  --border: #e5e7eb;
  --radius: 12px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

[hidden] { display: none !important; }

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 12px 20px;
}
.nav-brand { font-weight: 700; color: var(--primary); font-size: 1.1rem; }
.nav-links { display: flex; gap: 4px; flex-wrap: wrap; }
.nav-links a, .btn-link {
  padding: 10px 14px;
  border-radius: 8px;
  text-decoration: none;
  color: var(--text);
  font-size: 0.95rem;
  border: none;
  background: none;
  cursor: pointer;
}
.nav-links a:hover, .btn-link:hover { background: var(--bg); }
.nav-links a.active { background: var(--primary); color: #fff; }

.container { max-width: 720px; margin: 0 auto; padding: 24px 16px; }
h1 { font-size: 1.4rem; margin-bottom: 16px; }
h2 { font-size: 1.1rem; margin: 16px 0 8px; }

label { display: block; margin-bottom: 12px; font-size: 0.9rem; color: var(--muted); }
input, select {
  width: 100%;
  padding: 14px;
  margin-top: 4px;
  font-size: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fff;
}
input:focus, select:focus { outline: 2px solid var(--primary); border-color: transparent; }

.btn {
  display: inline-block;
  padding: 14px 20px;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  min-height: 48px;
  text-align: center;
  text-decoration: none;
}
.btn-primary { background: var(--primary); color: #fff; width: 100%; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary { background: var(--card); color: var(--text); border: 1px solid var(--border); }
.btn-danger { background: #fff; color: var(--danger); border: 1px solid var(--danger); }
.btn-lg { font-size: 1.1rem; }
.btn-xl { font-size: 1.3rem; padding: 18px; }
.btn:disabled { opacity: 0.6; cursor: wait; }

.auth-card, .charge-card, .config-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  margin: 24px auto;
  max-width: 440px;
}
.brand-title { text-align: center; color: var(--primary); margin-bottom: 20px; }
.switch-link { text-align: center; margin-top: 14px; font-size: 0.9rem; }
.error { color: var(--danger); margin-top: 12px; text-align: center; }

.amount-label { font-size: 1rem; }
.amount-wrap { display: flex; align-items: center; gap: 8px; margin-bottom: 14px; }
.currency { font-size: 1.6rem; color: var(--muted); }
#amount { font-size: 2.2rem; font-weight: 700; text-align: right; }
.input-optional { margin-bottom: 14px; }

.method-toggle { display: flex; gap: 8px; margin-bottom: 16px; }
.method-btn {
  flex: 1;
  padding: 12px;
  font-size: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fff;
  cursor: pointer;
}
.method-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }

#charge-result { text-align: center; }
.result-amount { font-size: 2rem; font-weight: 700; margin-bottom: 8px; }
.qr { width: 260px; max-width: 100%; margin: 16px auto; display: block; }
.badge {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.9rem;
}
.badge-pending { background: #fef3c7; color: var(--warning); }
.badge-paid { background: #dcfce7; color: var(--success); }
.badge-cancelled, .badge-expired { background: #fee2e2; color: var(--danger); }
.paid-banner {
  background: var(--success);
  color: #fff;
  font-size: 1.4rem;
  font-weight: 700;
  padding: 20px;
  border-radius: var(--radius);
  margin: 16px 0;
}
.result-actions { display: flex; gap: 8px; justify-content: center; margin-top: 16px; }
#btn-copy { margin-top: 8px; }

.filters { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-bottom: 16px; }
.filters input, .filters select { margin-top: 0; }
.filters #f-q { grid-column: 1 / -1; }

.charge-list { display: flex; flex-direction: column; gap: 8px; }
.charge-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
.charge-item .info { display: flex; flex-direction: column; gap: 2px; }
.charge-item .amount { font-weight: 700; font-size: 1.1rem; }
.charge-item .meta { color: var(--muted); font-size: 0.85rem; }

.pagination { display: flex; align-items: center; justify-content: center; gap: 12px; margin-top: 16px; }

.metrics { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; }
.metric-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.metric-label { color: var(--muted); font-size: 0.85rem; }
.metric-value { font-size: 1.6rem; font-weight: 700; }

.hint { color: var(--muted); font-size: 0.85rem; margin-bottom: 12px; }

@media (max-width: 480px) {
  .filters { grid-template-columns: 1fr; }
  .result-actions { flex-direction: column; }
}