:root {
  --brand: #D7DF21;
  --ink: #101010;
  --paper: #FFFFFF;
  --grey-100: #F5F5F5;
  --grey-200: #E9E9E9;
  --grey-400: #B8B8B8;
  --grey-600: #6E6E6E;
  --danger: #D8402B;
  --radius: 14px;
  --shadow: 0 2px 10px rgba(0,0,0,0.06);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--grey-100);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.app {
  max-width: 480px;
  margin: 0 auto;
  min-height: 100vh;
  background: var(--paper);
  display: flex;
  flex-direction: column;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px;
  border-bottom: 2px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
}

.topbar .brand {
  font-weight: 800;
  letter-spacing: 0.5px;
  font-size: 15px;
  text-transform: uppercase;
}
.topbar .brand span { color: var(--brand); }

.topbar .link {
  color: var(--grey-400);
  font-size: 13px;
  text-decoration: none;
}

.content {
  flex: 1;
  padding: 16px;
  padding-bottom: 100px;
}

.product-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border: 1.5px solid var(--grey-200);
  border-radius: var(--radius);
  margin-bottom: 10px;
  background: var(--paper);
}

.product-card .info { flex: 1; }
.product-card .name { font-weight: 700; font-size: 15px; }
.product-card .price { color: var(--grey-600); font-size: 13px; margin-top: 2px; }

.qty-control {
  display: flex;
  align-items: center;
  gap: 10px;
}

.qty-btn {
  width: 32px; height: 32px;
  border-radius: 50%;
  border: 1.5px solid var(--ink);
  background: var(--paper);
  font-size: 18px;
  font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  user-select: none;
}
.qty-btn:active { background: var(--brand); }

.qty-val { min-width: 20px; text-align: center; font-weight: 700; }

.summary-bar {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  max-width: 480px;
  margin: 0 auto;
  background: var(--paper);
  border-top: 2px solid var(--ink);
  padding: 14px 16px;
}

.summary-row {
  display: flex; justify-content: space-between;
  font-size: 13px; color: var(--grey-600);
  margin-bottom: 4px;
}

.summary-row.total {
  color: var(--ink);
  font-weight: 800;
  font-size: 20px;
  margin-top: 8px;
}

.btn {
  display: block;
  width: 100%;
  padding: 15px;
  border-radius: var(--radius);
  border: none;
  font-weight: 800;
  font-size: 15px;
  text-align: center;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.btn-primary { background: var(--brand); color: var(--ink); }
.btn-primary:disabled { background: var(--grey-200); color: var(--grey-400); cursor: not-allowed; }
.btn-ghost { background: var(--paper); color: var(--ink); border: 1.5px solid var(--ink); }
.btn-danger { background: var(--danger); color: var(--paper); }

.discount-row {
  display: flex;
  gap: 8px;
  margin: 14px 0;
}

.discount-row select, .discount-row input {
  border: 1.5px solid var(--grey-200);
  border-radius: 10px;
  padding: 10px;
  font-size: 14px;
}
.discount-row select { flex: 0 0 90px; }
.discount-row input { flex: 1; }

.pin-screen {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
  padding: 20px;
}

.pin-dots { display: flex; gap: 14px; }
.pin-dot {
  width: 16px; height: 16px;
  border-radius: 50%;
  border: 2px solid var(--ink);
}
.pin-dot.filled { background: var(--brand); }

.pin-keypad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  width: 100%;
  max-width: 280px;
}
.pin-key {
  aspect-ratio: 1;
  border-radius: 50%;
  border: 1.5px solid var(--grey-200);
  background: var(--paper);
  font-size: 22px;
  font-weight: 700;
  cursor: pointer;
}
.pin-key:active { background: var(--grey-100); }

.qr-screen {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 18px;
  padding: 20px;
  text-align: center;
}

.qr-img {
  width: 240px; height: 240px;
  object-fit: contain;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  background: var(--paper);
}

.qr-amount {
  font-size: 28px;
  font-weight: 800;
}

.form-field { margin-bottom: 14px; }
.form-field label {
  display: block;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--grey-600);
  margin-bottom: 6px;
}
.form-field input {
  width: 100%;
  padding: 12px;
  border-radius: 10px;
  border: 1.5px solid var(--grey-200);
  font-size: 15px;
}

.success-screen {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 20px;
  text-align: center;
}

.success-badge {
  width: 72px; height: 72px;
  border-radius: 50%;
  background: var(--brand);
  display: flex; align-items: center; justify-content: center;
  font-size: 34px;
  font-weight: 800;
}

.warranty-id {
  font-family: "SF Mono", Consolas, monospace;
  font-size: 16px;
  font-weight: 700;
  background: var(--grey-100);
  padding: 8px 14px;
  border-radius: 8px;
  margin-top: 4px;
}

.tabs {
  display: flex;
  border-bottom: 2px solid var(--ink);
}
.tab {
  flex: 1;
  padding: 12px;
  text-align: center;
  font-weight: 700;
  font-size: 13px;
  text-transform: uppercase;
  color: var(--grey-600);
  cursor: pointer;
  border-bottom: 3px solid transparent;
}
.tab.active { color: var(--ink); border-bottom-color: var(--brand); }

.admin-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px solid var(--grey-200);
}

.pill {
  font-size: 11px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 20px;
  background: var(--grey-100);
  text-transform: uppercase;
}
.pill.on { background: var(--brand); }

.empty-state {
  text-align: center;
  color: var(--grey-600);
  padding: 40px 20px;
  font-size: 14px;
}

.toast {
  position: fixed;
  bottom: 100px; left: 50%;
  transform: translateX(-50%);
  background: var(--ink);
  color: var(--paper);
  padding: 10px 18px;
  border-radius: 20px;
  font-size: 13px;
  z-index: 999;
}