:root {
  --bg: #0b1220;
  --bg-card: #111c33;
  --bg-elev: #16243f;
  --border: #213257;
  --text: #e6ecf7;
  --text-muted: #8aa1cc;
  --primary: #4f8cf7;
  --primary-hover: #3b78e6;
  --success: #22c55e;
  --danger: #ef4444;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: linear-gradient(180deg, #0a1224 0%, #0b1426 100%);
  color: var(--text);
  font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  min-height: 100vh;
}

.buy-shell {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.buy-header {
  border-bottom: 1px solid var(--border);
  background: rgba(11, 18, 32, 0.7);
  backdrop-filter: blur(10px);
  padding: 20px 0;
}
.buy-header .buy-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand { display: flex; align-items: center; gap: 14px; }
.brand-mark {
  width: 44px; height: 44px;
  border-radius: 10px;
  background: linear-gradient(135deg, #4f8cf7, #22c55e);
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 16px; letter-spacing: 0.04em;
  color: #0b1220;
}
.brand-title { font-size: 18px; font-weight: 700; letter-spacing: 0.01em; }
.brand-subtitle { font-size: 12px; color: var(--text-muted); }
.contact { color: var(--text-muted); font-size: 13px; display: flex; gap: 14px; flex-wrap: wrap; }
.contact a { color: var(--text); text-decoration: none; border-bottom: 1px dotted var(--border); }
.contact a:hover { color: var(--primary); }

main.buy-shell { padding-top: 36px; padding-bottom: 60px; }

h2 { font-size: 22px; margin: 0 0 18px; font-weight: 700; }

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}
.product-loading { color: var(--text-muted); grid-column: 1 / -1; text-align: center; padding: 40px; }
.product-empty   { color: var(--text-muted); grid-column: 1 / -1; text-align: center; padding: 40px; }

.product {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: transform 0.12s, border-color 0.12s, box-shadow 0.12s;
}
.product:hover { transform: translateY(-2px); border-color: var(--primary); box-shadow: 0 6px 18px rgba(79, 140, 247, 0.18); }
.product-img {
  height: 90px;
  border-radius: 10px;
  background: linear-gradient(135deg, #1c2c4f 0%, #243960 100%);
  display: flex; align-items: center; justify-content: center;
  font-weight: 800;
  font-size: 26px;
  color: var(--primary);
  letter-spacing: 0.02em;
}
.product-name { font-weight: 700; font-size: 16px; }
.product-desc { color: var(--text-muted); font-size: 13px; min-height: 36px; }
.product-meta { display: flex; align-items: baseline; gap: 8px; }
.product-price { font-size: 22px; font-weight: 800; color: var(--text); }
.product-face { color: var(--text-muted); font-size: 12px; }
.product-stock {
  font-size: 11px; padding: 2px 8px; border-radius: 999px; align-self: flex-start;
  background: rgba(34, 197, 94, 0.15); color: var(--success);
}
.product-stock.out { background: rgba(239, 68, 68, 0.15); color: var(--danger); }
.product .btn { margin-top: 4px; }

.btn {
  appearance: none; border: none; cursor: pointer;
  font: inherit; font-weight: 600;
  padding: 11px 18px; border-radius: 10px;
  transition: background 0.12s, transform 0.06s;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover:not(:disabled) { background: var(--primary-hover); }
.btn-primary:disabled { background: #3a4866; cursor: not-allowed; }
.btn-ghost { background: transparent; color: var(--text-muted); border: 1px solid var(--border); }
.btn-ghost:hover { color: var(--text); border-color: var(--primary); }

.checkout-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px;
}
@media (max-width: 720px) { .checkout-grid { grid-template-columns: 1fr; } }

.cart { display: flex; flex-direction: column; gap: 12px; }
.cart-row {
  display: flex; align-items: center; justify-content: space-between;
  color: var(--text-muted); font-size: 14px;
  border-bottom: 1px dashed var(--border); padding-bottom: 10px;
}
.cart-row:last-child { border: none; }
.cart-row.total {
  font-size: 18px; color: var(--text);
  border-top: 1px solid var(--border); border-bottom: none;
  padding-top: 14px; margin-top: 4px;
}
.cart-row .strong { color: var(--text); font-weight: 700; }
.cart-row input {
  width: 80px; padding: 8px 10px;
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: 8px;
  color: var(--text); font: inherit; text-align: right;
}

.form { display: flex; flex-direction: column; gap: 12px; }
.form label { display: flex; flex-direction: column; gap: 6px; }
.form label span { font-size: 12px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.04em; }
.form input {
  padding: 11px 14px;
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: 10px;
  color: var(--text); font: inherit;
  transition: border-color 0.12s;
}
.form input:focus { outline: none; border-color: var(--primary); }
.actions { display: flex; gap: 10px; justify-content: space-between; margin-top: 8px; }
.actions.center { justify-content: center; }

.confirm-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 36px 24px;
  text-align: center;
  max-width: 520px;
  margin: 20px auto;
}
.confirm-emoji {
  width: 64px; height: 64px; border-radius: 50%;
  background: rgba(34, 197, 94, 0.15); color: var(--success);
  display: flex; align-items: center; justify-content: center;
  font-size: 32px; font-weight: 800;
  margin: 0 auto 16px;
}
.pay-instructions {
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: 10px;
  padding: 14px 16px; text-align: left; color: var(--text-muted);
  white-space: pre-wrap;
}

.mono { font-family: ui-monospace, "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace; }
.muted { color: var(--text-muted); }
.strong { font-weight: 700; }

.buy-footer { border-top: 1px solid var(--border); padding: 16px 0; margin-top: 60px; }
.buy-footer .muted { font-size: 12px; }

.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  background: var(--bg-elev); color: var(--text);
  border: 1px solid var(--border); border-radius: 10px;
  padding: 12px 18px; font-size: 14px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.4);
  z-index: 999;
}
.toast.danger { border-color: var(--danger); color: #ffd6d6; }