/* Palette matches the desktop app (ui.py _configure_styles). */
:root {
  color-scheme: light;
  --bg: #eef4f8;
  --surface: #ffffff;
  --text: #172033;
  --muted: #475569;
  --heading: #102a43;
  --border: #bfcedb;
  --control-border: #8094aa;
  --primary: #174ea6;
  --primary-hover: #0f3f8f;
  --primary-text: #ffffff;
  --button-bg: #f8fafc;
  --button-hover: #e6f0fb;
  --focus: #174ea6;
  --error: #b42318;
  --ok: #146c43;
  --row-selected: #dbe7fb;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #0f172a;
    --surface: #1e293b;
    --text: #e2e8f0;
    --muted: #a5b4c8;
    --heading: #f1f5f9;
    --border: #334155;
    --control-border: #64748b;
    --primary: #8ab4f8;
    --primary-hover: #a8c7fa;
    --primary-text: #0b1b36;
    --button-bg: #273449;
    --button-hover: #334155;
    --focus: #8ab4f8;
    --error: #ff8a80;
    --ok: #6fdc9f;
    --row-selected: #24395e;
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0f172a;
  --surface: #1e293b;
  --text: #e2e8f0;
  --muted: #a5b4c8;
  --heading: #f1f5f9;
  --border: #334155;
  --control-border: #64748b;
  --primary: #8ab4f8;
  --primary-hover: #a8c7fa;
  --primary-text: #0b1b36;
  --button-bg: #273449;
  --button-hover: #334155;
  --focus: #8ab4f8;
  --error: #ff8a80;
  --ok: #6fdc9f;
  --row-selected: #24395e;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 "Segoe UI", system-ui, -apple-system, sans-serif;
}

.wrap {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 16px;
}

h1, h2, h3 {
  color: var(--heading);
  line-height: 1.25;
}

h1 { font-size: 1.9rem; margin: 0 0 4px; }
h2 { font-size: 1.5rem; margin: 20px 0 8px; }
h3 { font-size: 1.05rem; margin: 0 0 8px; }

.muted, .hint { color: var(--muted); }
.hint { font-size: 0.9rem; margin: 6px 0 0; }
.indent { margin-left: 28px; }

.skip-link {
  position: absolute;
  left: 8px;
  top: -48px;
  padding: 8px 12px;
  background: var(--primary);
  color: var(--primary-text);
  z-index: 10;
}
.skip-link:focus { top: 8px; }

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.site-header { padding: 24px 0 8px; }
.privacy-note { margin: 8px 0; }

.engine-status {
  display: inline-block;
  margin: 4px 0 0;
  padding: 6px 12px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--surface);
  font-size: 0.95rem;
}
.engine-status[data-state="ready"] { color: var(--ok); }
.engine-status[data-state="error"] { color: var(--error); border-color: var(--error); }

/* Tabs */
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 16px;
  border-bottom: 1px solid var(--border);
}
.tabs [role="tab"] {
  border: 1px solid transparent;
  border-bottom: none;
  border-radius: 6px 6px 0 0;
  background: transparent;
  color: var(--text);
  font-weight: 600;
  padding: 10px 16px;
  margin-bottom: -1px;
}
.tabs [role="tab"][aria-selected="true"] {
  background: var(--surface);
  border-color: var(--border);
  color: var(--heading);
  box-shadow: inset 0 3px 0 var(--primary);
}
[role="tabpanel"] { padding-bottom: 24px; }
[role="tabpanel"]:focus-visible { outline: 3px solid var(--focus); outline-offset: 4px; }

/* Cards and forms */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
}
.card ol { margin: 0; padding-left: 22px; }
.stack { display: grid; gap: 10px; margin-top: 12px; }

fieldset.card { margin: 0; }
fieldset.nested { border: none; padding: 0; margin-top: 4px; }
fieldset.nested:disabled { opacity: 0.6; }
legend { font-weight: 600; color: var(--heading); padding: 0 4px; }

.field label { display: block; font-weight: 600; margin-bottom: 6px; }
.field-error { color: var(--error); font-weight: 600; margin: 6px 0 0; }

input[type="text"],
input[type="search"],
textarea {
  width: 100%;
  font: inherit;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--control-border);
  border-radius: 6px;
  padding: 8px 10px;
}
input[type="file"] { font: inherit; color: var(--text); max-width: 100%; }
textarea.code {
  font-family: Consolas, "Cascadia Mono", Menlo, monospace;
  font-size: 0.9rem;
  white-space: pre;
  overflow: auto;
}

.check {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin: 6px 0;
}
.check input { margin-top: 4px; width: 18px; height: 18px; flex: none; }

/* Buttons */
button,
.button {
  font: inherit;
  font-weight: 600;
  color: var(--text);
  background: var(--button-bg);
  border: 1px solid var(--control-border);
  border-radius: 6px;
  padding: 8px 14px;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
}
button:hover:not(:disabled),
.button:hover { background: var(--button-hover); }
button.primary {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--primary-text);
}
button.primary:hover:not(:disabled) { background: var(--primary-hover); }
button:disabled { cursor: not-allowed; opacity: 0.55; }

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin: 14px 0 10px;
}
.push-right { margin-left: auto; }

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 8px;
}
@media (max-width: 760px) {
  .grid-2 { grid-template-columns: 1fr; }
}

.status-text { white-space: pre-wrap; overflow-wrap: anywhere; margin: 0; }
.status-text[data-state="error"] { color: var(--error); font-weight: 600; }

.checks-list {
  margin: 0;
  padding-left: 20px;
  max-height: 320px;
  overflow-y: auto;
  font-size: 0.92rem;
}
.checks-list li { margin-bottom: 4px; }

/* Quiz table */
.table-scroll {
  overflow: auto;
  max-height: 60vh;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-top: 8px;
}
table { border-collapse: collapse; width: 100%; min-width: 720px; }
th, td {
  text-align: left;
  vertical-align: top;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
}
thead th {
  position: sticky;
  top: 0;
  background: var(--button-bg);
  color: var(--heading);
  z-index: 1;
}
tbody tr { cursor: pointer; }
tbody tr:hover { background: var(--button-hover); }
tbody tr.empty { cursor: default; }
tbody tr.empty:hover { background: transparent; }
td.question { min-width: 280px; }
td.actions-cell { white-space: nowrap; }
td.actions-cell button { padding: 4px 10px; }

/* Dialog */
dialog {
  width: min(820px, calc(100vw - 32px));
  max-height: calc(100vh - 48px);
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text);
  padding: 20px;
}
dialog::backdrop { background: rgb(15 23 42 / 0.55); }
.dialog-header h2 { margin-top: 0; }
.dialog-body { overflow-wrap: anywhere; }
.dialog-body p { white-space: pre-wrap; margin: 0; }
.dialog-body h3 { margin: 16px 0 4px; }
.dialog-body ul { margin: 0; padding-left: 20px; }
.dialog-body .correct { font-weight: 700; }

.site-footer {
  color: var(--muted);
  font-size: 0.85rem;
  text-align: right;
  padding-bottom: 24px;
}