:root {
  --bg: #0f172a;
  --card: #1e293b;
  --ink: #e2e8f0;
  --muted: #94a3b8;
  --line: #334155;
  --accent: #3b82f6;
  --ok: #22c55e;
  --warn: #f59e0b;
  --err: #ef4444;
}

* { box-sizing: border-box; }

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

main { max-width: 1080px; margin: 24px auto; padding: 0 16px; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 20px;
  margin-bottom: 16px;
}
.card h2 { margin-top: 0; font-size: 16px; }

label { display: block; font-size: 13px; color: var(--muted); margin-top: 10px; }

.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin: 8px 0; }
.row.actions { margin-top: 14px; }

input[type="text"] {
  flex: 1;
  min-width: 260px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 14px;
  background: var(--bg);
  color: var(--ink);
}
input[type="text"]:focus { outline: 2px solid var(--accent); outline-offset: -1px; }

input[type="file"] { font-size: 14px; color: var(--ink); }

button {
  padding: 10px 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--card);
  color: var(--ink);
  cursor: pointer;
  font-size: 14px;
}
button:hover:not(:disabled) { border-color: var(--accent); }
button:disabled { opacity: 0.5; cursor: not-allowed; }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button.big { font-size: 16px; padding: 12px 22px; }

.muted { color: var(--muted); font-size: 13px; }
.err { color: var(--err); }

code {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 1px 5px;
  font-size: 12px;
}

/* --- Loading spinner --- */
.spinner {
  display: inline-block;
  width: 15px;
  height: 15px;
  border: 2px solid rgba(148, 163, 184, 0.35);
  border-top-color: currentColor;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  vertical-align: -2px;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* --- Guide (details) --- */
.guide { margin-top: 14px; border: 1px solid var(--line); border-radius: 8px; padding: 10px 14px; }
.guide summary { cursor: pointer; font-size: 14px; color: var(--accent); }
.guide ol { margin: 10px 0 4px; padding-left: 20px; font-size: 13px; }
.guide li { margin-bottom: 6px; }
.guide ul { margin: 4px 0; padding-left: 18px; }

/* --- Tables --- */
.table-wrap { overflow-x: auto; margin-top: 10px; }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th, td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--line); white-space: nowrap; }
th { color: var(--muted); }
#order-table td:nth-child(2), #order-table td:nth-child(8) { white-space: normal; }

#toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: #e2e8f0;
  color: #0f172a;
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 14px;
  z-index: 10;
}
#toast.error { background: var(--err); color: #fff; }

/* --- Print area: ẩn trên màn hình, chỉ hiện khi in --- */
#printArea { display: none; }

@media print {
  body { background: #fff; color: #000; }
  #site-header, main, #toast { display: none !important; }
  #printArea { display: block !important; padding: 24px; }
  #printArea h1 { font-size: 18px; margin: 0 0 12px; }
  #printArea table { width: 100%; border-collapse: collapse; font-size: 12px; }
  #printArea th, #printArea td {
    border: 1px solid #999;
    padding: 5px 7px;
    text-align: left;
    white-space: normal;
  }
  #printArea th { background: #f0f0f0; }
}