:root {
  color-scheme: dark;
  --bg: #0f1216;
  --panel: #171b21;
  --panel-elevated: #1e232b;
  --border: #262c35;
  --border-focus: #4f8cff;
  --text: #e6e9ee;
  --muted: #93a0b0;
  --accent: #4f8cff;
  --accent-hover: #6fa0ff;
  --danger: #ff8a94;
  --danger-bg: rgba(229, 72, 77, 0.14);
  --red: #e5484d;
  --soon: #d9a441;
  --soon-bg: rgba(217, 164, 65, 0.12);
  --success: #3ddc97;
  --success-bg: rgba(61, 220, 151, 0.12);
  --input-bg: #0f1319;
  --placeholder: #55606e;
  --topbar-bg: rgba(23, 27, 33, 0.95);
  --btn-secondary: #2a3340;
  --btn-secondary-hover: #343f4f;
  --stat-hover-bg: #232a34;
  --row-hover: rgba(255, 255, 255, 0.02);
  --alert-info-text: #a9c6ff;
  --alert-error-text: #ff9aa0;
}

/* System-light, unless the user forced dark with the toggle */
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    color-scheme: light;
    --bg: #f4f6f9;
    --panel: #ffffff;
    --panel-elevated: #f0f3f7;
    --border: #d9dee6;
    --border-focus: #2f66d0;
    --text: #1c2430;
    --muted: #5c6b7d;
    --accent: #2f66d0;
    --accent-hover: #1f56c0;
    --danger: #c62f36;
    --danger-bg: rgba(229, 72, 77, 0.1);
    --red: #d32f36;
    --soon: #92660f;
    --soon-bg: rgba(217, 164, 65, 0.18);
    --success: #158a5a;
    --success-bg: rgba(21, 138, 90, 0.12);
    --input-bg: #ffffff;
    --placeholder: #9aa6b5;
    --topbar-bg: rgba(255, 255, 255, 0.92);
    --btn-secondary: #e6eaf0;
    --btn-secondary-hover: #d9dfe8;
    --stat-hover-bg: #e9eef5;
    --row-hover: rgba(0, 0, 0, 0.03);
    --alert-info-text: #274f9e;
    --alert-error-text: #a1272d;
  }
}

/* User forced light with the toggle (must mirror the media block above) */
:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f4f6f9;
  --panel: #ffffff;
  --panel-elevated: #f0f3f7;
  --border: #d9dee6;
  --border-focus: #2f66d0;
  --text: #1c2430;
  --muted: #5c6b7d;
  --accent: #2f66d0;
  --accent-hover: #1f56c0;
  --danger: #c62f36;
  --danger-bg: rgba(229, 72, 77, 0.1);
  --red: #d32f36;
  --soon: #92660f;
  --soon-bg: rgba(217, 164, 65, 0.18);
  --success: #158a5a;
  --success-bg: rgba(21, 138, 90, 0.12);
  --input-bg: #ffffff;
  --placeholder: #9aa6b5;
  --topbar-bg: rgba(255, 255, 255, 0.92);
  --btn-secondary: #e6eaf0;
  --btn-secondary-hover: #d9dfe8;
  --stat-hover-bg: #e9eef5;
  --row-hover: rgba(0, 0, 0, 0.03);
  --alert-info-text: #274f9e;
  --alert-error-text: #a1272d;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.center { display: flex; min-height: 100vh; align-items: center; justify-content: center; padding: 20px; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 24px 20px 60px; }
.wrap.narrow { max-width: 480px; }
.muted { color: var(--muted); }
.small { font-size: 12px; }
.hint { display: block; margin-top: 4px; font-size: 12px; color: var(--muted); }

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex; align-items: center; gap: 14px;
  padding: 14px 20px; background: var(--topbar-bg);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
}
.brand { font-size: 16px; }
.spacer { flex: 1; }

/* Light/dark toggle */
button.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 5px 9px;
  font-size: 15px;
  line-height: 1;
}
button.theme-toggle:hover { filter: none; border-color: var(--accent); }
body.center .theme-toggle { position: fixed; top: 16px; right: 16px; }

.card {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: 14px; padding: 22px; margin-bottom: 22px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
}
.login { width: 100%; max-width: 360px; }
h1 { font-size: 22px; margin: 0 0 6px; }
h2 { font-size: 17px; margin: 0 0 16px; }
h3 { font-size: 16px; margin: 0 0 10px; }

label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 12px; }
input, select, textarea {
  display: block; width: 100%; margin-top: 6px; padding: 10px 12px;
  background: var(--input-bg); color: var(--text);
  border: 1px solid var(--border); border-radius: 8px; font-size: 14px;
  transition: border-color 0.15s, box-shadow 0.15s;
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(79, 140, 255, 0.18);
}
input::placeholder { color: var(--placeholder); }

button {
  background: var(--accent); color: #fff; border: none; cursor: pointer;
  padding: 10px 16px; border-radius: 8px; font-size: 14px; font-weight: 600;
  transition: filter 0.15s, transform 0.05s;
}
button:hover { filter: brightness(1.12); }
button:active { transform: translateY(1px); }
button.secondary { background: var(--btn-secondary); color: var(--text); }
button.secondary:hover { background: var(--btn-secondary-hover); }
button.link { background: none; padding: 4px 6px; color: var(--accent); font-weight: 500; }
button.link.danger {
  color: #fff;
  background: var(--red);
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 6px;
}
button.link.danger:hover { background: #ff6b70; }
button.danger { background: var(--red); color: #fff; }
button.danger:hover { filter: brightness(1.12); }

a.link, .actions a {
  color: var(--accent); text-decoration: none; font-weight: 500;
  padding: 4px 6px; display: inline-block; border-radius: 5px;
  transition: background 0.12s;
}
a.link:hover, .actions a:hover { text-decoration: none; background: rgba(79, 140, 255, 0.1); }

.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 6px 18px; }
.grid .full { grid-column: 1 / -1; }
.form-actions { display: flex; align-items: center; gap: 12px; margin-top: 8px; }
.row { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; flex-wrap: wrap; }
.row h2 { margin: 0; }

.inline-form { display: flex; gap: 8px; align-items: center; }
.inline-input { width: 220px; margin-top: 0 !important; }

/* Stats cards — clickable filter buttons */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
button.stat {
  background: var(--panel-elevated);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  text-align: center;
  color: var(--text);
  font: inherit;
  font-weight: 400;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, transform 0.05s;
}
button.stat:hover {
  filter: none;
  border-color: var(--accent);
  background: var(--stat-hover-bg);
}
button.stat:focus-visible {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(79, 140, 255, 0.18);
}
button.stat[aria-pressed="true"] {
  border-color: var(--accent);
  background: rgba(79, 140, 255, 0.1);
}
.stat-value {
  display: block;
  font-size: 28px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.1;
}
.stat-label {
  display: block;
  font-size: 12px;
  color: var(--muted);
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* Collapsible add-voucher form */
details.add-details summary {
  cursor: pointer;
  font-size: 17px;
  font-weight: 600;
  list-style: none;
  user-select: none;
}
details.add-details summary::-webkit-details-marker { display: none; }
details.add-details summary .summary-icon {
  display: inline-block;
  color: var(--accent);
  margin-right: 6px;
  transition: transform 0.15s;
}
details.add-details[open] summary { margin-bottom: 16px; }
details.add-details[open] summary .summary-icon { transform: rotate(45deg); }
details.add-details summary:hover { color: var(--accent-hover); }

/* Search */
.search-box { margin-bottom: 14px; }
.search-box input {
  max-width: 420px;
  background: var(--panel-elevated);
}

/* Table */
.table-wrap { overflow-x: auto; border-radius: 10px; border: 1px solid var(--border); }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 12px 10px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { color: var(--muted); font-weight: 600; font-size: 11px; text-transform: uppercase; letter-spacing: .05em; background: var(--panel-elevated); }
tbody tr { transition: background 0.12s; }
tbody tr:hover { background: var(--row-hover); }
tbody tr.soon { background: var(--soon-bg); }
tbody tr.soon:hover { background: rgba(217, 164, 65, 0.16); }
tbody tr.expired { background: var(--danger-bg); }
tbody tr.expired:hover { background: rgba(229, 72, 77, 0.16); }

.name-cell { min-width: 180px; }
.expiry-cell { white-space: nowrap; }
.expiry-date { display: block; margin-bottom: 4px; }
.next-reminder { display: block; margin-top: 4px; }

/* Voucher code + copy button */
.code-text { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
button.copy-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 12px;
  line-height: 1;
  padding: 3px 6px;
  border-radius: 6px;
  margin-left: 6px;
  vertical-align: 1px;
  transition: border-color 0.15s, color 0.15s;
}
button.copy-btn:hover { filter: none; border-color: var(--accent); color: var(--accent); }
button.copy-btn.copied { border-color: var(--success); color: var(--success); }

/* Reminder-threshold progress chips (edit page) */
.threshold-chips { margin: 6px 0 0; display: flex; gap: 6px; flex-wrap: wrap; }
.chip {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  border: 1px solid var(--border);
  color: var(--muted);
}
.chip.sent {
  background: var(--success-bg);
  border-color: rgba(61, 220, 151, 0.35);
  color: var(--success);
}
.actions { display: flex; gap: 2px; white-space: nowrap; }
.actions form { display: inline; }
.actions-head { min-width: 120px; }

.badge { display: inline-block; padding: 3px 9px; border-radius: 999px; font-size: 12px; font-weight: 600; white-space: nowrap; }
.badge.red { background: rgba(229, 72, 77, 0.18); color: var(--red); }
.badge.orange { background: var(--soon-bg); color: var(--soon); }
.badge.green { background: var(--success-bg); color: var(--success); }

.alert { padding: 12px 14px; border-radius: 8px; margin-bottom: 18px; font-size: 14px; transition: opacity 0.6s; }
.alert.fade-out { opacity: 0; }
.alert.info { background: rgba(79, 140, 255, 0.12); color: var(--alert-info-text); }
.alert.error { background: rgba(229, 72, 77, 0.12); color: var(--alert-error-text); }

.empty-state { text-align: center; padding: 40px 20px; }
.empty-icon { font-size: 42px; margin-bottom: 10px; }
.table-footnote { margin-top: 8px; }

/* Danger zone */
.danger-zone { border-color: rgba(229, 72, 77, 0.25); }
.danger-zone h2 { color: var(--danger); }
.danger-row { justify-content: space-between; align-items: center; margin-bottom: 14px; }
.danger-row:last-child { margin-bottom: 0; }
.danger-row strong { display: block; color: var(--text); margin-bottom: 2px; }

/* Modal */
.modal {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px;
  max-width: 400px;
  width: 90%;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
}
.modal::backdrop { background: rgba(0, 0, 0, 0.65); backdrop-filter: blur(2px); }
.modal form { margin: 0; }
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 18px; }

@media (max-width: 860px) {
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .inline-form { width: 100%; margin-top: 8px; }
  .inline-input { flex: 1; width: auto; }
  .row { gap: 8px; }
}

@media (max-width: 640px) {
  .grid { grid-template-columns: 1fr; }
  .stat-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
  button.stat { padding: 12px; }
  .stat-value { font-size: 22px; }
  .wrap { padding: 16px 14px 40px; }
  .topbar { gap: 10px; padding: 12px 14px; font-size: 13px; }
  .brand span { display: none; }
  .danger-row { flex-direction: column; align-items: flex-start; gap: 10px; }

  /* Vouchers table becomes stacked cards */
  .table-wrap { overflow: visible; border: none; border-radius: 0; }
  #billTable, #billTable tbody { display: block; }
  #billTable thead { display: none; }
  #billTable tbody tr {
    display: block;
    background: var(--panel-elevated);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 14px;
    margin-bottom: 12px;
  }
  #billTable tbody tr.soon { border-color: rgba(217, 164, 65, 0.45); background: var(--soon-bg); }
  #billTable tbody tr.expired { border-color: rgba(229, 72, 77, 0.45); background: var(--danger-bg); }
  #billTable td {
    display: block;
    border: none;
    padding: 3px 0;
  }
  #billTable td[data-label]::before {
    content: attr(data-label);
    display: inline-block;
    width: 62px;
    color: var(--muted);
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .05em;
  }
  #billTable .name-cell { min-width: 0; padding-bottom: 6px; font-size: 15px; }
  #billTable .expiry-cell { white-space: normal; }
  #billTable .expiry-date { display: inline; margin: 0 8px 0 0; }
  #billTable td.actions {
    display: flex;
    flex-direction: row;
    gap: 10px;
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid var(--border);
  }
  #billTable td.actions form { display: inline; }
}

@media (max-width: 420px) {
  .stat-grid { grid-template-columns: 1fr; }
}

/* Paid one-off bills: settle them visually */
tr.paid td { opacity: 0.62; }
tr.paid .name-cell strong { text-decoration: line-through; text-decoration-thickness: 1px; }
#billTable tbody tr.paid { border-color: rgba(70, 167, 88, 0.35); }