:root {
  --bg: #f5f5f5;
  --surface: #ffffff;
  --fg: #111111;
  --muted: #6b6b6b;
  --brand: #b91c1c;
  --brand-dark: #7f1d1d;
  --header-bg: #ffffff;
  --header-fg: #111111;
  --border: #e5e5e5;
  --row-alt: #fafafa;
  --error: #b91c1c;
  --success: #047857;
  --radius: 6px;
}
* { box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.45;
}

.admin-nav {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.6rem 1rem;
  background: var(--header-bg);
  border-bottom: 3px solid var(--brand);
  color: var(--header-fg);
  flex-wrap: wrap;
}
.admin-nav .brand a {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 700;
  text-decoration: none;
  color: var(--header-fg);
  letter-spacing: 0.02em;
}
.admin-nav .brand-logo { height: 36px; width: 36px; display: block; flex-shrink: 0; }
.admin-nav nav { display: flex; gap: 1rem; flex: 1; flex-wrap: wrap; }
.admin-nav nav a { color: var(--fg); text-decoration: none; padding: 0.25rem 0; white-space: nowrap; }
.admin-nav nav a:hover { color: var(--brand); }
.admin-nav .user { font-size: 0.9rem; color: var(--muted); white-space: nowrap; }
.admin-nav .user a { color: var(--brand); margin-left: 0.5rem; }

@media (max-width: 640px) {
  .admin-nav { gap: 0.5rem 1rem; padding: 0.5rem 0.75rem; }
  .admin-nav .brand a { font-size: 0.95rem; }
  .admin-nav nav { width: 100%; order: 3; gap: 0.85rem; font-size: 0.9rem; }
  .admin-nav nav a { padding: 0.15rem 0; }
}

.admin-main { max-width: 1200px; margin: 0 auto; padding: 1.5rem; }
.admin-main h1 { margin-top: 0; }

.flash { padding: 0.75rem 1rem; border-radius: var(--radius); margin: 0.5rem 0 1rem; }
.flash-success { background: #d1fae5; color: var(--success); }
.flash-error { background: #fee2e2; color: var(--error); }

.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.25rem; margin: 1rem 0; }
.card.stacked { display: flex; flex-direction: column; gap: 0.75rem; }
.card h2 { margin-top: 0; }

table.data { width: 100%; border-collapse: collapse; background: var(--surface); }
table.data th, table.data td { padding: 0.5rem; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; }
table.data thead th { background: var(--row-alt); font-size: 0.85rem; color: var(--muted); font-weight: 600; text-transform: uppercase; letter-spacing: 0.03em; }
table.data tr:hover { background: var(--row-alt); }
table.matrix th { white-space: nowrap; }
table.matrix td { vertical-align: top; min-width: 200px; }
table.matrix label { font-size: 0.75rem; color: var(--muted); margin-right: 0.5rem; display: inline-flex; align-items: center; gap: 0.25rem; }

form.inline { display: inline; }
form.inline + form.inline { margin-left: 0.25rem; }

input[type=text], input[type=email], input[type=password], input[type=number], input[type=date], input[type=time], input[type=tel], textarea, select {
  padding: 0.4rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font: inherit;
  background: var(--surface);
  color: var(--fg);
}
input:focus, textarea:focus, select:focus {
  outline: 2px solid var(--brand);
  outline-offset: -1px;
  border-color: var(--brand);
}
label { display: block; font-size: 0.85rem; color: var(--muted); }
label > input, label > textarea, label > select { display: block; width: 100%; margin-top: 0.25rem; }
.grid { display: grid; gap: 0.75rem; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }

button {
  background: var(--fg);
  color: white;
  border: none;
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
button:hover { background: var(--brand); }
button.danger { background: var(--brand); }
button.danger:hover { background: var(--brand-dark); }
button.link { background: none; color: var(--brand); padding: 0; text-decoration: underline; cursor: pointer; border: none; font-weight: 500; }
button.link:hover { color: var(--brand-dark); }
button.link.danger { color: var(--error); }

.stats { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); margin-bottom: 1rem; }
.stat { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem; border-left: 4px solid var(--brand); }
.stat-label { font-size: 0.8rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.03em; }
.stat-value { font-size: 2rem; font-weight: 700; margin: 0.25rem 0; color: var(--brand); }
.stat-sub { color: var(--muted); font-size: 0.85rem; }

.login-card {
  max-width: 360px;
  margin: 4rem auto;
  background: var(--surface);
  padding: 2rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  border-top: 4px solid var(--brand);
}
.login-card h1 { margin-top: 0; color: var(--brand); }
.login-card label + label { margin-top: 0.75rem; }
.login-card button { width: 100%; margin-top: 1rem; background: var(--brand); }
.login-card button:hover { background: var(--brand-dark); }

ul.items { margin: 0; padding-left: 1rem; }
ul.items li.refunded { text-decoration: line-through; color: var(--muted); }

.inv-chip {
  display: inline-block;
  background: var(--row-alt);
  border: 1px solid var(--border);
  color: var(--fg);
  border-radius: 999px;
  padding: 0.1rem 0.6rem;
  margin: 0.1rem 0.2rem 0.1rem 0;
  font-size: 0.8rem;
  white-space: nowrap;
}

fieldset { border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem; margin: 0.5rem 0; background: var(--surface); }
fieldset legend { padding: 0 0.5rem; font-weight: 600; }

.btn { display: inline-block; background: var(--brand); color: white; padding: 0.5rem 1rem; border-radius: var(--radius); text-decoration: none; font-weight: 600; }
.btn:hover { background: var(--brand-dark); color: white; }

button.undo { background: #fff; color: var(--muted); border: 1px solid var(--border); }
button.undo:hover { background: var(--row-alt); color: var(--fg); }

/* Mobile: enlarge tap targets, stack forms, and reflow tables. */
@media (max-width: 720px) {
  .admin-main { padding: 1rem 0.85rem; }
  button, .btn { padding: 0.65rem 1rem; }
  .stats, .grid { grid-template-columns: 1fr; }

  /* Plain tables (e.g. the pricing matrix) scroll sideways instead of breaking. */
  table.data:not(.cards) { display: block; width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; }
  table.data:not(.cards) thead th, table.data:not(.cards) td { white-space: nowrap; }

  /* Card tables: each row becomes a stacked card with the header as a label. */
  table.data.cards, table.data.cards tbody, table.data.cards tfoot,
  table.data.cards tr, table.data.cards th, table.data.cards td { display: block; width: 100%; }
  table.data.cards thead { display: none; }
  table.data.cards tr {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.4rem 0.85rem;
    margin-bottom: 0.75rem;
  }
  table.data.cards tr:hover { background: var(--surface); }
  table.data.cards td, table.data.cards th {
    border: none;
    border-bottom: 1px solid var(--border);
    padding: 0.45rem 0;
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 1rem;
    text-align: right;
  }
  table.data.cards tr > *:last-child { border-bottom: none; }
  table.data.cards td[data-label]::before, table.data.cards th[data-label]::before {
    content: attr(data-label);
    font-weight: 600;
    color: var(--muted);
    text-align: left;
    flex: 0 0 8rem;
    text-transform: none;
    letter-spacing: normal;
  }
  table.data.cards td:empty { display: none; }
  table.data.cards input:not([type=checkbox]):not([type=radio]),
  table.data.cards select,
  table.data.cards textarea { width: 100% !important; }
  table.data.cards form.inline { display: block; width: 100%; }
  table.data.cards form.inline + form.inline { margin-left: 0; margin-top: 0.35rem; }
}