:root {
  --bg-page: #0f172a;
  --bg-container: #1e293b;
  --bg-surface: #0f172a;
  --bg-code: #1e293b;
  --bg-hover: #0f172a;
  --text-primary: #e2e8f0;
  --text-heading: #e2e8f0;
  --text-muted: #94a3b8;
  --text-subtle: #cbd5e1;
  --border-color: #334155;
  --link-color: #93c5fd;
  --btn-bg: #334155;
  --btn-text: #e2e8f0;
  --btn-primary-bg: #2563eb;
  --btn-primary-text: #fff;
  --btn-danger-bg: #dc2626;
  --btn-danger-text: #fff;
  --error-color: #f87171;
  --balance-ok: #4ade80;
  --balance-bad: #f87171;
  --remove-bg: #7f1d1d;
  --remove-text: #fecaca;
  --empty-row-color: #64748b;
  --shadow-color: rgba(0, 0, 0, 0.4);
  --active-nav-bg: #334155;
  --active-nav-text: #fff;
}

:root[data-theme="light"] {
  --bg-page: #f1f5f9;
  --bg-container: #ffffff;
  --bg-surface: #f8fafc;
  --bg-code: #e2e8f0;
  --bg-hover: #eef2f7;
  --text-primary: #1e293b;
  --text-heading: #0f172a;
  --text-muted: #64748b;
  --text-subtle: #334155;
  --border-color: #cbd5e1;
  --link-color: #1d4ed8;
  --btn-bg: #e2e8f0;
  --btn-text: #1e293b;
  --btn-primary-bg: #2563eb;
  --btn-primary-text: #fff;
  --btn-danger-bg: #dc2626;
  --btn-danger-text: #fff;
  --error-color: #dc2626;
  --balance-ok: #16a34a;
  --balance-bad: #dc2626;
  --remove-bg: #fee2e2;
  --remove-text: #991b1b;
  --empty-row-color: #94a3b8;
  --shadow-color: rgba(15, 23, 42, 0.1);
  --active-nav-bg: #2563eb;
  --active-nav-text: #fff;
}

body {
  font-family:
    -apple-system,
    Segoe UI,
    Roboto,
    Arial,
    sans-serif;
  background: var(--bg-page);
  color: var(--text-primary);
  margin: 0;
  padding: 2rem;
  transition:
    background-color 0.15s ease,
    color 0.15s ease;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  background: var(--bg-container);
  padding: 1.5rem 2rem 2rem;
  border-radius: 8px;
  box-shadow: 0 4px 16px var(--shadow-color);
  transition:
    background-color 0.15s ease,
    box-shadow 0.15s ease;
}

h1 {
  margin-top: 0;
  color: var(--text-heading);
}

.subtitle {
  color: var(--text-muted);
  margin-top: -0.5rem;
}

.row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 1rem 0;
  flex-wrap: wrap;
}

label {
  display: block;
  margin-top: 1rem;
  margin-bottom: 0.35rem;
  font-weight: 600;
  color: var(--text-subtle);
}

select,
textarea,
input[type="text"],
input[type="number"],
input[type="datetime-local"] {
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 0.5rem 0.65rem;
  font-family: Consolas, Menlo, monospace;
  font-size: 0.9rem;
}

textarea {
  width: 100%;
  box-sizing: border-box;
  resize: vertical;
}

input[type="text"] {
  flex: 1;
}

.copy-row {
  display: flex;
  gap: 0.5rem;
  width: 100%;
}

button {
  cursor: pointer;
  border: none;
  border-radius: 6px;
  padding: 0.55rem 1.1rem;
  font-weight: 600;
  background: var(--btn-bg);
  color: var(--btn-text);
}

button:hover {
  filter: brightness(1.15);
}

button.primary {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
}

button.danger {
  background: var(--btn-danger-bg);
  color: var(--btn-danger-text);
}

pre {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 1rem;
  white-space: pre-wrap;
  word-break: break-all;
  max-height: 400px;
  overflow: auto;
  color: var(--text-primary);
}

.error {
  color: var(--error-color);
  min-height: 1.2rem;
  font-size: 0.9rem;
}

.info-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 0.75rem 1rem;
  margin: 1rem 0;
}

.info-box summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--link-color);
}

.info-box dl {
  margin: 0.75rem 0 0;
}

.info-box dt {
  font-weight: 600;
  color: var(--text-heading);
  margin-top: 0.75rem;
}

.info-box dt:first-child {
  margin-top: 0.5rem;
}

.info-box dd {
  margin: 0.25rem 0 0;
  color: var(--text-subtle);
  line-height: 1.5;
}

.info-box code {
  background: var(--bg-code);
  border-radius: 4px;
  padding: 0.1rem 0.3rem;
  font-size: 0.85em;
}

.info-box .hint {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin: 0.75rem 0 0;
}

.tax-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 0.75rem;
  font-size: 0.9rem;
}

.tax-table th,
.tax-table td {
  text-align: left;
  padding: 0.4rem 0.6rem;
  border-bottom: 1px solid var(--border-color);
}

.tax-table th {
  color: var(--link-color);
}

.top-bar {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.theme-toggle {
  padding: 0.3rem 0.6rem;
  font-size: 1rem;
  line-height: 1;
  background: var(--btn-bg);
  border: 1px solid var(--border-color);
}

.lang-switch {
  display: flex;
  justify-content: flex-end;
  gap: 0.4rem;
  margin-bottom: 0;
}

.lang-switch button {
  padding: 0.3rem 0.7rem;
  font-size: 0.8rem;
  background: var(--btn-bg);
}

.lang-switch button.active {
  background: var(--btn-primary-bg);
  color: #fff;
}

.top-nav {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.top-nav a {
  color: var(--link-color);
  text-decoration: none;
  font-weight: 600;
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
  font-size: 0.9rem;
}

.top-nav a:hover {
  background: var(--bg-hover);
}

.top-nav a.active {
  background: var(--active-nav-bg);
  color: var(--active-nav-text);
}

.info-box ol {
  margin: 0.75rem 0 0;
  padding-left: 1.25rem;
  color: var(--text-subtle);
  line-height: 1.6;
}

.info-box ol li {
  margin-bottom: 0.5rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem 1.5rem;
  margin-top: 0.5rem;
}

.grid-2 label {
  margin-top: 0;
}

.grid-2 input,
.grid-2 select {
  width: 100%;
  box-sizing: border-box;
}

.inline-form {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: flex-end;
  margin: 1rem 0;
}

.inline-form label {
  display: flex;
  flex-direction: column;
  margin: 0;
  font-size: 0.8rem;
  gap: 0.3rem;
  color: var(--text-subtle);
  font-weight: 600;
}

.inline-form input,
.inline-form select {
  width: auto;
}

.cart-table,
.payments-table {
  width: 100%;
  border-collapse: collapse;
  margin: 0.75rem 0;
  font-size: 0.9rem;
}

.cart-table th,
.cart-table td,
.payments-table th,
.payments-table td {
  text-align: left;
  padding: 0.4rem 0.6rem;
  border-bottom: 1px solid var(--border-color);
}

.cart-table th,
.payments-table th {
  color: var(--link-color);
}

.cart-table tfoot td {
  border-bottom: none;
}

.cart-table .empty-row,
.payments-table .empty-row {
  color: var(--empty-row-color);
  font-style: italic;
}

.remove-btn {
  background: var(--remove-bg);
  color: var(--remove-text);
  padding: 0.25rem 0.55rem;
  font-size: 0.8rem;
  border-radius: 4px;
}

.balance-ok {
  color: var(--balance-ok);
  font-weight: 600;
}

.balance-bad {
  color: var(--balance-bad);
  font-weight: 600;
}

.qr-wrap {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
  margin: 0.75rem 0 1.5rem;
}

.qr-wrap span {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.qr-wrap canvas {
  background: #fff;
  padding: 8px;
  border-radius: 6px;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  filter: none;
}

.print-btn {
  margin-left: 0.25rem;
}

@media print {
  body {
    background: #fff;
    color: #000;
    padding: 0;
  }

  .top-bar,
  .top-nav,
  button {
    display: none !important;
  }

  .container {
    max-width: 100%;
    margin: 0;
    padding: 0;
    background: #fff;
    box-shadow: none;
  }

  h1,
  h2,
  h3,
  .info-box dt {
    color: #000;
  }

  .subtitle,
  .hint,
  .info-box dd,
  .info-box ol {
    color: #333;
  }

  .info-box {
    background: #fff;
    border: 1px solid #999;
    break-inside: avoid;
    page-break-inside: avoid;
  }

  .info-box summary {
    color: #000;
    list-style: none;
  }

  .info-box summary::-webkit-details-marker {
    display: none;
  }

  /* Force every collapsed <details> section open so its content prints. */
  details:not([open]) {
    display: block;
  }

  details:not([open]) > *:not(summary) {
    display: block !important;
  }

  .info-box code {
    background: #eee;
    color: #000;
  }

  .tax-table th,
  .tax-table td,
  .cart-table th,
  .cart-table td,
  .payments-table th,
  .payments-table td {
    border-bottom: 1px solid #999;
    color: #000;
  }

  a {
    color: #000;
    text-decoration: underline;
  }

  a[href]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: #555;
  }

  .mermaid svg {
    max-width: 100%;
  }
}