:root {
  --earn-color: #1a7f37;
  --redeem-color: #b8390e;
  --bg: #f5f6f8;
  --panel-bg: #ffffff;
  --border: #d9dce1;
  --text: #1f2328;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}

.login-body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}

.login-card {
  background: var(--panel-bg);
  padding: 2rem 2.5rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  width: 320px;
}

.login-card label {
  display: block;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

.login-card input {
  display: block;
  width: 100%;
  padding: 0.5rem;
  margin-top: 0.25rem;
  border: 1px solid var(--border);
  border-radius: 6px;
}

.error-banner {
  background: #fde8e8;
  color: #8a1f1f;
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1.5rem;
  background: var(--panel-bg);
  border-bottom: 1px solid var(--border);
}

.offline-badge {
  background: #fde8e8;
  color: #8a1f1f;
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  font-size: 0.8rem;
  margin-left: 0.75rem;
}

.link-button {
  background: none;
  border: none;
  color: #555;
  text-decoration: underline;
  cursor: pointer;
}

.layout {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 1rem;
  padding: 1.5rem;
}

.scan-panel, .history-panel {
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem;
}

#scan-input {
  width: 100%;
  font-size: 1.3rem;
  padding: 0.75rem;
  border: 2px solid var(--border);
  border-radius: 8px;
}

.status-banner {
  margin-top: 0.75rem;
  padding: 0.6rem 0.9rem;
  border-radius: 8px;
  font-weight: 600;
}

.status-loading { background: #eef1f5; color: #444; }
.status-error { background: #fde8e8; color: #8a1f1f; }
.status-success { background: #e6f4ea; color: #1a7f37; }

.customer-panel {
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.op-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 1rem 0;
}

.op-box {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
}

.op-box label { display: block; font-size: 0.85rem; margin-bottom: 0.5rem; }
.op-box input {
  width: 100%;
  padding: 0.5rem;
  margin-top: 0.25rem;
  border: 1px solid var(--border);
  border-radius: 6px;
}

.preview { font-size: 0.85rem; color: #555; min-height: 1.1em; }

.btn {
  padding: 0.6rem 1.1rem;
  border: none;
  border-radius: 8px;
  font-weight: 700;
  cursor: pointer;
  width: 100%;
}

.btn-earn { background: var(--earn-color); color: white; }
.btn-redeem { background: var(--redeem-color); color: white; }
.btn-secondary { background: #eef1f5; color: #333; margin-top: 0.75rem; }
.btn-primary { background: #1155cc; color: white; }

.history-panel ul { list-style: none; padding: 0; margin: 0.75rem 0 0; }
.history-item {
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.82rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
}
.history-earn { color: var(--earn-color); }
.history-redeem, .history-reversal { color: var(--redeem-color); }
.history-reverse-btn { font-size: 0.78rem; white-space: nowrap; }

.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal[hidden] {
  display: none;
}

.modal-box {
  background: white;
  padding: 1.5rem;
  border-radius: 10px;
  max-width: 420px;
  width: 90%;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

@media (max-width: 720px) {
  .layout {
    grid-template-columns: 1fr;
    padding: 1rem;
    gap: 0.75rem;
  }

  .op-grid {
    grid-template-columns: 1fr;
  }

  .topbar {
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
  }

  .login-card {
    width: 100%;
    max-width: 320px;
    padding: 1.5rem;
  }
}