/* ==========================================================================
   EPSO Practice — stylesheet
   Light theme tokens on :root; dark theme via prefers-color-scheme (unless
   data-theme="light") and via an explicit data-theme="dark".
   ========================================================================== */

:root {
  color-scheme: light;
  --bg: #f3f5f9;
  --surface: #ffffff;
  --surface-2: #eceff5;
  --surface-3: #e1e5ee;
  --border: #d5dae4;
  --border-strong: #b6bfcf;
  --text: #182033;
  --muted: #5d6679;
  --primary: #1d4ed8;
  --primary-hover: #173fb0;
  --primary-ink: #ffffff;
  --primary-soft: #e2e9fc;
  --success: #15803d;
  --success-soft: #dcf5e6;
  --danger: #b91c1c;
  --danger-soft: #fde4e4;
  --warn: #a16207;
  --warn-soft: #fcf0cf;
  --flag: #d97706;
  --flag-soft: #fde8c8;
  --focus: #2563eb;
  --figure-bg: #ffffff;
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.06), 0 2px 8px rgba(15, 23, 42, 0.06);
  --radius: 10px;
  --radius-sm: 6px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --header-h: 56px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #0e1320;
    --surface: #161c2b;
    --surface-2: #1d2436;
    --surface-3: #262e42;
    --border: #2b3447;
    --border-strong: #3f4a62;
    --text: #e7eaf2;
    --muted: #9ca5b8;
    --primary: #7ea2ff;
    --primary-hover: #97b4ff;
    --primary-ink: #0b1020;
    --primary-soft: #1e2a4d;
    --success: #4ade80;
    --success-soft: #11321f;
    --danger: #f87171;
    --danger-soft: #3b1414;
    --warn: #fbbf24;
    --warn-soft: #3a2d0b;
    --flag: #fbbf24;
    --flag-soft: #3a2d0b;
    --focus: #93b4ff;
    --figure-bg: #ffffff;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 2px 10px rgba(0, 0, 0, 0.35);
  }
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0e1320;
  --surface: #161c2b;
  --surface-2: #1d2436;
  --surface-3: #262e42;
  --border: #2b3447;
  --border-strong: #3f4a62;
  --text: #e7eaf2;
  --muted: #9ca5b8;
  --primary: #7ea2ff;
  --primary-hover: #97b4ff;
  --primary-ink: #0b1020;
  --primary-soft: #1e2a4d;
  --success: #4ade80;
  --success-soft: #11321f;
  --danger: #f87171;
  --danger-soft: #3b1414;
  --warn: #fbbf24;
  --warn-soft: #3a2d0b;
  --flag: #fbbf24;
  --flag-soft: #3a2d0b;
  --focus: #93b4ff;
  --figure-bg: #ffffff;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 2px 10px rgba(0, 0, 0, 0.35);
}

/* ---------- base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
}
h1, h2, h3, h4 { line-height: 1.25; margin: 0 0 0.5rem; }
h1 { font-size: 1.75rem; }
h2 { font-size: 1.25rem; }
h3 { font-size: 1.05rem; }
p { margin: 0 0 0.75rem; }
a { color: var(--primary); }
code, kbd, pre, .mono { font-family: var(--mono); font-size: 0.92em; }
kbd {
  display: inline-block; padding: 0 0.35em; border: 1px solid var(--border-strong);
  border-bottom-width: 2px; border-radius: 4px; background: var(--surface-2); line-height: 1.5;
}
pre.code { background: var(--surface-2); padding: 0.75rem; border-radius: var(--radius-sm); overflow: auto; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
[hidden] { display: none !important; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}
.skip-link { position: absolute; left: -999px; top: 8px; background: var(--primary); color: var(--primary-ink); padding: 0.5rem 0.75rem; border-radius: var(--radius-sm); z-index: 100; }
.skip-link:focus { left: 8px; }
.muted { color: var(--muted); }
.small { font-size: 0.875rem; }
.eyebrow { text-transform: uppercase; letter-spacing: 0.06em; font-size: 0.75rem; font-weight: 700; color: var(--muted); margin-bottom: 0.25rem; }
.error-text { color: var(--danger); }

/* ---------- header / nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 1rem;
  height: var(--header-h); padding: 0 1rem;
  background: var(--surface); border-bottom: 1px solid var(--border);
}
.brand { display: inline-flex; align-items: center; gap: 0.5rem; font-weight: 700; text-decoration: none; color: var(--text); white-space: nowrap; margin-right: auto; }
.brand-mark {
  display: inline-grid; place-items: center; width: 28px; height: 28px; border-radius: 8px;
  background: var(--primary); color: var(--primary-ink); font-size: 0.7rem; font-weight: 800; letter-spacing: 0.02em;
}
.site-nav { display: flex; gap: 0.25rem; overflow-x: auto; scrollbar-width: none; }
.site-nav::-webkit-scrollbar { display: none; }
.site-nav a {
  text-decoration: none; color: var(--muted); padding: 0.4rem 0.7rem; border-radius: var(--radius-sm);
  font-weight: 500; white-space: nowrap;
}
.site-nav a:hover { background: var(--surface-2); color: var(--text); }
.site-nav a[aria-current="page"] { background: var(--primary-soft); color: var(--primary); }
.site-account { display: flex; align-items: center; gap: 0.5rem; flex: none; padding-left: 0.75rem; border-left: 1px solid var(--border); }
.account-link {
  display: inline-flex; align-items: center; gap: 0.45rem; max-width: 14rem; padding: 0.25rem 0.55rem 0.25rem 0.3rem;
  border-radius: var(--radius-sm); color: var(--text); text-decoration: none; font-weight: 500;
}
.account-link:hover { background: var(--surface-2); }
.account-link[aria-current="page"] { background: var(--primary-soft); color: var(--primary); }
.account-avatar {
  display: inline-grid; place-items: center; flex: none; width: 28px; height: 28px; border-radius: 50%;
  background: var(--surface-3); color: var(--text); font-size: 0.8rem; font-weight: 700;
}
.account-link[aria-current="page"] .account-avatar { background: var(--primary); color: var(--primary-ink); }
.account-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.site-footer { text-align: center; color: var(--muted); font-size: 0.8rem; padding: 1rem; border-top: 1px solid var(--border); }
main.app { max-width: 1180px; margin: 0 auto; padding: 1.5rem 1rem 3rem; min-height: calc(100vh - var(--header-h) - 60px); }
main.app.wide { max-width: 1440px; }
main.app:focus { outline: none; }

/* ---------- generic components ---------- */
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.1rem 1.25rem; box-shadow: var(--shadow); margin-bottom: 1rem;
}
.page-head { display: flex; flex-wrap: wrap; align-items: flex-start; justify-content: space-between; gap: 1rem; margin-bottom: 1rem; }
.page-head h1 { margin-bottom: 0.25rem; }
.page-head .actions { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.section-title { margin-top: 1.5rem; }
.back-link { display: inline-block; margin-bottom: 0.35rem; font-size: 0.9rem; text-decoration: none; }
.back-link:hover { text-decoration: underline; }
.loading { padding: 3rem 1rem; text-align: center; color: var(--muted); }
.loading::before {
  content: ""; display: block; width: 28px; height: 28px; margin: 0 auto 0.75rem; border-radius: 50%;
  border: 3px solid var(--border); border-top-color: var(--primary); animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.empty { color: var(--muted); padding: 1rem 0; }
.note { background: var(--warn-soft); border-left: 4px solid var(--warn); padding: 0.6rem 0.9rem; border-radius: var(--radius-sm); margin-bottom: 1rem; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.4rem;
  padding: 0.5rem 0.9rem; min-height: 2.4rem;
  border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  background: var(--surface); color: var(--text); font: inherit; font-weight: 500; line-height: 1.2;
  cursor: pointer; text-decoration: none; white-space: nowrap;
}
.btn:hover { background: var(--surface-2); }
.btn:disabled, .btn[aria-disabled="true"] { opacity: 0.55; cursor: not-allowed; }
.btn-primary { background: var(--primary); border-color: var(--primary); color: var(--primary-ink); }
.btn-primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); }
.btn-ghost { background: transparent; border-color: transparent; color: var(--primary); }
.btn-ghost:hover { background: var(--primary-soft); }
.btn-danger { background: var(--danger); border-color: var(--danger); color: #fff; }
.btn-danger:hover { filter: brightness(0.92); background: var(--danger); }
.btn-danger-outline { background: transparent; border-color: var(--danger); color: var(--danger); }
.btn-danger-outline:hover { background: var(--danger-soft); }
.btn-flag { border-color: var(--flag); color: var(--flag); background: transparent; }
.btn-flag:hover, .btn-flag.active { background: var(--flag-soft); }
.btn-sm { padding: 0.3rem 0.65rem; min-height: 2rem; font-size: 0.9rem; }
.btn-lg { padding: 0.7rem 1.3rem; font-size: 1.05rem; }
.form-actions { display: flex; flex-wrap: wrap; gap: 0.6rem; align-items: center; margin-top: 1rem; }

.badge {
  display: inline-block; padding: 0.15rem 0.55rem; border-radius: 999px; font-size: 0.75rem; font-weight: 700;
  letter-spacing: 0.03em; text-transform: uppercase; background: var(--surface-2); color: var(--muted);
}
.badge-pass, .badge-correct { background: var(--success-soft); color: var(--success); }
.badge-fail, .badge-incorrect { background: var(--danger-soft); color: var(--danger); }
.badge-missed { background: var(--warn-soft); color: var(--warn); }
.badge-flag { background: var(--flag-soft); color: var(--flag); }
.badge-progress { background: var(--primary-soft); color: var(--primary); }
.chips { display: flex; flex-wrap: wrap; gap: 0.35rem; margin: 0.35rem 0; }
.field-counts { margin: 0 0 0.35rem; }
.chip {
  display: inline-block; padding: 0.1rem 0.55rem; border-radius: 999px; font-size: 0.78rem; font-weight: 600;
  background: var(--surface-2); color: var(--muted); border: 1px solid var(--border);
}
.chip.easy { background: var(--success-soft); color: var(--success); border-color: transparent; }
.chip.medium { background: var(--warn-soft); color: var(--warn); border-color: transparent; }
.chip.hard { background: var(--danger-soft); color: var(--danger); border-color: transparent; }
.chip.tag { font-weight: 500; }

.table-wrap { overflow-x: auto; }
.table { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
.table th, .table td { padding: 0.55rem 0.6rem; border-bottom: 1px solid var(--border); text-align: left; vertical-align: middle; }
.table thead th { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--muted); font-weight: 700; }
.table tbody tr:hover { background: var(--surface-2); }
.table .actions-cell { white-space: nowrap; text-align: right; }
.table .actions-cell .btn { margin-left: 0.25rem; }
.row-link { cursor: pointer; }
.row-link:focus-visible { outline-offset: -3px; }
.stem-cell { max-width: 32rem; }
.table-meta { margin: 0 0 0.5rem; }
.pagination { display: flex; align-items: center; justify-content: space-between; gap: 0.75rem; margin-top: 0.75rem; flex-wrap: wrap; }
.bar { display: inline-block; vertical-align: middle; width: 80px; height: 8px; border-radius: 999px; background: var(--surface-3); overflow: hidden; margin-right: 0.4rem; }
.bar span { display: block; height: 100%; background: var(--primary); border-radius: 999px; }
.bar.pass span { background: var(--success); }
.bar.fail span { background: var(--danger); }

/* forms */
label { font-weight: 500; }
.field, .form-grid label, .filters label, .io-form label { display: flex; flex-direction: column; gap: 0.3rem; font-size: 0.9rem; }
input[type="text"], input[type="password"], input[type="number"], input[type="search"], input[type="file"], select, textarea {
  font: inherit; color: var(--text); background: var(--surface); border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm); padding: 0.45rem 0.6rem; min-height: 2.4rem; max-width: 100%;
}
input[type="number"] { width: 7rem; }
textarea { width: 100%; resize: vertical; }
input[type="checkbox"], input[type="radio"] { width: 1.1rem; height: 1.1rem; accent-color: var(--primary); }
.check, .radio { display: flex; align-items: flex-start; gap: 0.6rem; font-weight: 500; padding: 0.35rem 0; }
.check input, .radio input { margin-top: 0.25rem; flex: none; }
.check .hint, .radio .hint { display: block; font-weight: 400; color: var(--muted); font-size: 0.875rem; }
fieldset { border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 0.75rem 1rem; margin: 0 0 1rem; min-width: 0; }
legend { font-weight: 600; padding: 0 0.35rem; }
.hint { color: var(--muted); font-size: 0.875rem; }
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 0.75rem 1rem; margin-bottom: 1rem; }
.field-row { display: flex; flex-wrap: wrap; gap: 1rem; margin-bottom: 1rem; }
.form-errors { background: var(--danger-soft); color: var(--danger); border-left: 4px solid var(--danger); padding: 0.6rem 0.9rem; border-radius: var(--radius-sm); margin-top: 1rem; }
.form-errors ul { margin: 0; padding-left: 1.2rem; }
.form-ok { color: var(--success); }
.inline-error { margin: 0; padding: 0.5rem 0.75rem; border-left: 4px solid var(--danger); border-radius: var(--radius-sm); background: var(--danger-soft); color: var(--danger); }
.inline-error:empty { display: none; }
[aria-invalid="true"] { border-color: var(--danger) !important; }
.input-group { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.input-group input { flex: 1 1 12rem; min-width: 0; }
.explain { margin: 0.5rem 0 0; padding-left: 1.1rem; color: var(--muted); font-size: 0.9rem; }
.explain li { margin-bottom: 0.25rem; }
.explain b { color: var(--text); }

/* toasts */
.toasts { position: fixed; right: 1rem; bottom: 1rem; display: grid; gap: 0.5rem; z-index: 60; max-width: min(400px, calc(100vw - 2rem)); }
.toast {
  display: flex; gap: 0.6rem; align-items: flex-start; padding: 0.7rem 0.9rem;
  border-radius: var(--radius); background: var(--surface); border: 1px solid var(--border);
  border-left: 4px solid var(--primary); box-shadow: var(--shadow); animation: toast-in 0.2s ease-out;
}
.toast.error { border-left-color: var(--danger); }
.toast.success { border-left-color: var(--success); }
.toast.warn { border-left-color: var(--warn); }
.toast.leaving { opacity: 0; transition: opacity 0.2s; }
.toast-msg { flex: 1; font-size: 0.95rem; }
.toast-close { background: none; border: 0; color: var(--muted); font-size: 1.2rem; line-height: 1; cursor: pointer; padding: 0 0.2rem; }
@keyframes toast-in { from { transform: translateY(8px); opacity: 0; } to { transform: none; opacity: 1; } }

/* dialog */
dialog.modal {
  border: 1px solid var(--border); border-radius: var(--radius); padding: 0;
  max-width: min(480px, calc(100vw - 2rem)); background: var(--surface); color: var(--text); box-shadow: var(--shadow);
}
dialog.modal::backdrop { background: rgba(8, 12, 24, 0.55); }
.modal-body { padding: 1.25rem 1.25rem 0.5rem; }
.modal-body p { white-space: pre-line; }
.modal-actions { display: flex; justify-content: flex-end; gap: 0.5rem; padding: 0.75rem 1.25rem 1.25rem; }

.segmented { display: inline-flex; flex-wrap: wrap; border: 1px solid var(--border-strong); border-radius: var(--radius-sm); overflow: hidden; }
.seg { background: var(--surface); color: var(--muted); border: 0; border-right: 1px solid var(--border); padding: 0.4rem 0.8rem; font: inherit; font-weight: 500; cursor: pointer; }
.seg:last-child { border-right: 0; }
.seg:hover { background: var(--surface-2); }
.seg.active { background: var(--primary); color: var(--primary-ink); }

/* ---------- home ---------- */
.hero { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1.25rem; padding: 1.75rem; }
.hero-text { max-width: 640px; }
.hero h1 { font-size: 2rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.stat-tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 0.75rem; margin-bottom: 1rem; }
.stat-tile { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 0.75rem 1rem; }
.stat-tile .value { font-size: 1.6rem; font-weight: 700; line-height: 1.1; }
.stat-tile .label { color: var(--muted); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.04em; }
.type-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 1rem; }
.type-card { display: flex; flex-direction: column; gap: 0.35rem; margin: 0; }
.type-card-head { display: flex; justify-content: space-between; align-items: baseline; gap: 0.5rem; }
.type-card-head h3 { margin: 0; }
.type-card .count { color: var(--muted); font-size: 0.85rem; white-space: nowrap; }
.type-stats { font-size: 0.875rem; margin: 0.25rem 0; }
.type-card-foot { display: flex; justify-content: space-between; align-items: center; gap: 0.5rem; margin-top: auto; padding-top: 0.5rem; }

/* ---------- practice form ---------- */
.practice-form .types { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 0.25rem 1rem; }
.section-list { padding-left: 1.3rem; margin: 0.5rem 0; }
.section-list li { margin-bottom: 0.3rem; }
.section-list .done { color: var(--muted); text-decoration: line-through; }
.section-list .current { font-weight: 600; }
.intro-card { max-width: 760px; margin: 1rem auto; padding: 1.75rem; }
.intro-facts { padding-left: 1.2rem; }
.intro-facts li { margin-bottom: 0.35rem; }

/* ---------- test page ---------- */
.test-bar {
  position: sticky; top: var(--header-h); z-index: 10;
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 0.6rem 1rem;
  padding: 0.6rem 0.9rem; margin-bottom: 1rem;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow);
}
.test-bar-info { display: flex; flex-wrap: wrap; align-items: center; gap: 0.6rem; }
.test-bar-tools { display: flex; flex-wrap: wrap; align-items: center; gap: 0.6rem; }
.section-name { font-size: 1.05rem; }
.q-counter { color: var(--muted); }
.save-status { color: var(--muted); font-size: 0.8rem; min-width: 4rem; text-align: right; }
.timer {
  display: inline-flex; align-items: baseline; gap: 0.5rem; padding: 0.3rem 0.7rem;
  border-radius: var(--radius-sm); background: var(--surface-2);
  font-family: var(--mono); font-size: 1.35rem; font-weight: 600; font-variant-numeric: tabular-nums;
}
.timer-label { font-family: var(--font); font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted); }
.timer.warn { background: var(--warn-soft); color: var(--warn); }
.timer.warn .timer-label { color: var(--warn); }
.timer.danger { background: var(--danger-soft); color: var(--danger); animation: pulse 1s ease-in-out infinite; }
.timer.danger .timer-label { color: var(--danger); }
@keyframes pulse { 50% { opacity: 0.55; } }
@media (prefers-reduced-motion: reduce) { .timer.danger { animation: none; } .toast { animation: none; } }

.test-body { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 1rem; align-items: start; }
.test-side { position: sticky; top: calc(var(--header-h) + 76px); display: grid; gap: 1rem; }
.side-card { margin: 0; }
.side-head { display: flex; justify-content: space-between; align-items: baseline; gap: 0.5rem; margin-bottom: 0.5rem; }
.side-head h3 { margin: 0; }
.kbd-hint { margin: 0; }

.question-layout { display: grid; gap: 1rem; margin-bottom: 1rem; }
.question-layout.split { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
.passage-panel, .data-panel, .question-panel {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem 1.15rem;
}
.passage-panel { max-height: calc(100vh - var(--header-h) - 150px); overflow: auto; line-height: 1.7; }
.panel-title { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted); }
.passage-text { font-size: 1.02rem; margin: 0; }
.q-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem; font-size: 0.85rem; margin-bottom: 0.35rem; }
.stem { font-size: 1.12rem; font-weight: 600; margin: 0.25rem 0 1rem; }
.stem:focus { outline: none; }
.q-number { color: var(--muted); font-weight: 700; }
.options { display: grid; gap: 0.5rem; }
.option {
  display: grid; grid-template-columns: 2rem minmax(0, 1fr) auto; align-items: center; gap: 0.75rem;
  width: 100%; text-align: left; padding: 0.65rem 0.8rem;
  border: 2px solid var(--border); border-radius: var(--radius); background: var(--surface); color: var(--text);
  font: inherit; cursor: default;
}
button.option { cursor: pointer; }
button.option:hover { border-color: var(--border-strong); background: var(--surface-2); }
.option-letter {
  display: inline-grid; place-items: center; width: 2rem; height: 2rem; border-radius: 50%;
  background: var(--surface-2); font-weight: 700; flex: none;
}
.option[aria-checked="true"], .option.selected { border-color: var(--primary); background: var(--primary-soft); }
.option[aria-checked="true"] .option-letter, .option.selected .option-letter { background: var(--primary); color: var(--primary-ink); }
.option.correct { border-color: var(--success); background: var(--success-soft); }
.option.correct .option-letter { background: var(--success); color: #fff; }
.option.incorrect { border-color: var(--danger); background: var(--danger-soft); }
.option.incorrect .option-letter { background: var(--danger); color: #fff; }
.option.missed { border-style: dashed; }
.option-tag { font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.03em; color: var(--muted); white-space: nowrap; }
.option.correct .option-tag { color: var(--success); }
.option.incorrect .option-tag { color: var(--danger); }

.q-toolbar { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 0.6rem; margin-bottom: 1rem; }
.q-toolbar-left, .q-toolbar-right { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.feedback-box { padding: 0.75rem 1rem; border-radius: var(--radius); border-left: 4px solid var(--primary); background: var(--surface); border: 1px solid var(--border); border-left-width: 4px; }
.feedback-box.ok { border-left-color: var(--success); background: var(--success-soft); }
.feedback-box.ko { border-left-color: var(--danger); background: var(--danger-soft); }

/* navigator palette */
.navigator { display: grid; grid-template-columns: repeat(auto-fill, minmax(2.5rem, 1fr)); gap: 0.4rem; }
.nav-q {
  position: relative; height: 2.5rem; border: 2px solid var(--border); border-radius: var(--radius-sm);
  background: var(--surface); color: var(--text); font: inherit; font-weight: 600; cursor: pointer;
}
.nav-q:hover { border-color: var(--border-strong); }
.nav-q.answered { background: var(--primary-soft); border-color: var(--primary); color: var(--primary); }
.nav-q.flagged { background: var(--flag-soft); border-color: var(--flag); color: var(--flag); }
.nav-q.answered-flagged { background: var(--primary-soft); border-color: var(--flag); color: var(--primary); }
.nav-q.flagged::after, .nav-q.answered-flagged::after {
  content: ""; position: absolute; top: 3px; right: 3px; width: 7px; height: 7px; border-radius: 50%; background: var(--flag);
}
.nav-q.current { outline: 3px solid var(--focus); outline-offset: 1px; }
.legend { display: flex; flex-wrap: wrap; gap: 0.4rem 0.9rem; font-size: 0.78rem; color: var(--muted); margin-top: 0.75rem; }
.legend-swatch { display: inline-block; width: 0.85rem; height: 0.85rem; border-radius: 3px; border: 2px solid var(--border); vertical-align: -2px; margin-right: 0.3rem; background: var(--surface); }
.legend-swatch.answered { background: var(--primary-soft); border-color: var(--primary); }
.legend-swatch.flagged { background: var(--flag-soft); border-color: var(--flag); }
.legend-swatch.current { outline: 2px solid var(--focus); }

/* abstract figures */
.frames { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 0.6rem; margin-bottom: 1rem; }
.figure {
  position: relative; display: grid; place-items: center; aspect-ratio: 1 / 1; padding: 4%;
  border: 2px solid var(--border-strong); border-radius: var(--radius-sm); background: var(--figure-bg); color: #000; overflow: hidden;
}
.figure svg { width: 100%; height: auto; display: block; }
.figure.unknown { font-size: 2.6rem; font-weight: 700; color: var(--muted); border-style: dashed; background: var(--surface-2); }
.figure-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 0.6rem; }
.figure-option {
  display: grid; gap: 0.4rem; justify-items: center; padding: 0.45rem; margin: 0;
  border: 2px solid var(--border); border-radius: var(--radius); background: var(--surface); color: var(--text); font: inherit;
}
.figure-option .figure { width: 100%; border-color: var(--border); }
button.figure-option { cursor: pointer; }
button.figure-option:hover { border-color: var(--border-strong); background: var(--surface-2); }
.figure-option[aria-checked="true"], .figure-option.selected { border-color: var(--primary); background: var(--primary-soft); }
.figure-option[aria-checked="true"] .option-letter, .figure-option.selected .option-letter { background: var(--primary); color: var(--primary-ink); }
.figure-option.correct { border-color: var(--success); background: var(--success-soft); }
.figure-option.correct .option-letter { background: var(--success); color: #fff; }
.figure-option.incorrect { border-color: var(--danger); background: var(--danger-soft); }
.figure-option.incorrect .option-letter { background: var(--danger); color: #fff; }
.figure-option.missed { border-style: dashed; }
.figure-option .option-tag { text-align: center; }

/* numerical table */
.data-table-wrap { overflow-x: auto; }
.data-table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; font-size: 0.95rem; }
.data-table caption { caption-side: top; text-align: left; font-weight: 600; padding: 0 0 0.5rem; }
.data-table th, .data-table td { border: 1px solid var(--border); padding: 0.4rem 0.6rem; text-align: right; }
.data-table th.row-label, .data-table tbody th { text-align: left; font-weight: 500; }
.data-table thead th { background: var(--surface-2); font-weight: 700; }
.data-table tbody tr:nth-child(even) td, .data-table tbody tr:nth-child(even) th { background: var(--surface-2); }
.table-notes { color: var(--muted); font-size: 0.85rem; margin: 0.5rem 0 0; }

/* calculator */
.calculator { margin: 0; padding: 0.8rem; }
.calc-expr { font-family: var(--mono); font-size: 0.75rem; color: var(--muted); text-align: right; min-height: 1.1rem; }
.calc-display {
  font-family: var(--mono); font-size: 1.5rem; text-align: right; background: var(--surface-2);
  border-radius: var(--radius-sm); padding: 0.45rem 0.7rem; margin-bottom: 0.5rem;
  overflow: hidden; white-space: nowrap; text-overflow: ellipsis; min-height: 2.7rem;
}
.calc-keys { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.35rem; }
.calc-key {
  height: 2.5rem; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface);
  color: var(--text); font: inherit; font-size: 1.05rem; cursor: pointer;
}
.calc-key:hover { background: var(--surface-2); }
.calc-key.op { background: var(--surface-2); font-weight: 600; }
.calc-key.eq { background: var(--primary); border-color: var(--primary); color: var(--primary-ink); font-weight: 700; }

/* ---------- results ---------- */
.score-card { display: flex; flex-wrap: wrap; align-items: center; gap: 1.25rem; border-left: 6px solid var(--border-strong); }
.score-card.pass { border-left-color: var(--success); }
.score-card.fail { border-left-color: var(--danger); }
.score-big { font-size: 3rem; font-weight: 800; line-height: 1; min-width: 7rem; font-variant-numeric: tabular-nums; }
.score-card.pass .score-big { color: var(--success); }
.score-card.fail .score-big { color: var(--danger); }
.headline { font-size: 1.15rem; font-weight: 600; margin-bottom: 0.3rem; }
.hint-card { border-left: 4px solid var(--warn); display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem; }
.review-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 0.75rem; margin-bottom: 1rem; }
.review-section-title { margin: 1.25rem 0 0.75rem; color: var(--muted); }
.review-card { border-left: 4px solid var(--border-strong); }
.review-card.correct { border-left-color: var(--success); }
.review-card.incorrect { border-left-color: var(--danger); }
.review-card.missed { border-left-color: var(--warn); }
.review-card .question-layout { margin-bottom: 0.5rem; }
.review-card .passage-panel, .review-card .question-panel, .review-card .data-panel { box-shadow: none; }
.review-card-head { display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem; margin-bottom: 0.75rem; }
.answer-line { margin: 0.5rem 0; }
.explanation { background: var(--surface-2); border-radius: var(--radius-sm); padding: 0.75rem 1rem; margin-top: 0.5rem; }

/* ---------- bank ---------- */
.filters { display: flex; flex-wrap: wrap; gap: 0.75rem 1rem; align-items: flex-end; }
.filters label { min-width: 150px; flex: 1 1 150px; }
.filter-actions { display: flex; gap: 0.5rem; }
.bank-io summary { cursor: pointer; font-weight: 600; }
.io-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.5rem; margin-top: 1rem; }
.io-form { display: flex; flex-direction: column; gap: 0.6rem; align-items: flex-start; }
.io-form h3 { margin: 0; }
.io-form .btn { align-self: flex-start; }
.io-result ul { margin: 0.25rem 0 0; padding-left: 1.2rem; font-size: 0.875rem; }
.opt-row { display: grid; grid-template-columns: auto 2rem minmax(0, 1fr); align-items: center; gap: 0.6rem; margin-bottom: 0.5rem; }
.opt-row input[type="text"] { width: 100%; }
.q-form label { display: flex; flex-direction: column; gap: 0.3rem; margin-bottom: 1rem; font-size: 0.9rem; }
.q-form .form-grid label { margin-bottom: 0; }
.meta-details { margin-top: 0.75rem; }
.meta-details summary { cursor: pointer; color: var(--muted); }

/* ---------- settings ---------- */
.settings-types input[type="number"] { width: 6rem; }
.settings-types th[scope="row"] { font-weight: 600; }
.mix-row { display: flex; flex-wrap: wrap; gap: 1rem; align-items: flex-end; }
.mix-sum { font-weight: 600; }
.mix-sum.bad { color: var(--danger); }
.mix-sum.ok { color: var(--success); }
.toggle-list { display: grid; gap: 0.25rem; }

/* ---------- accounts: sign-in, profile, users ---------- */
/* 16px inputs: no zoom-on-focus on phones */
.auth-form .field { font-size: 1rem; gap: 0.35rem; margin-bottom: 0.9rem; }
.auth-form .field input, .auth-form .field select { width: 100%; }
.auth-form .input-group input { width: auto; }
.login-card { max-width: 420px; margin: 2.5rem auto; padding: 1.75rem; }
.login-mark { width: 40px; height: 40px; font-size: 0.85rem; margin-bottom: 0.75rem; }
.login-form { margin-top: 1rem; }
.login-form .inline-error { margin-bottom: 0.9rem; }
.login-form .btn { width: 100%; }
.login-alt { margin: 1rem 0 0; text-align: center; }
.card-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: 0.5rem 1rem; margin-bottom: 0.75rem; }
.card-head h2 { margin: 0; }
.card-foot { margin: 0.75rem 0 0; }
.profile-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr)); gap: 1rem; align-items: start; margin-bottom: 1rem; }
.profile-grid > .card { margin: 0; }
.kv { display: grid; grid-template-columns: max-content minmax(0, 1fr); gap: 0.45rem 1.25rem; margin: 0; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; font-weight: 500; overflow-wrap: anywhere; }
.user-form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr)); gap: 0 1rem; align-items: start; }
.user-form-grid .field:nth-child(2) { grid-column: span 2; }
.badge-admin { background: var(--primary-soft); color: var(--primary); }
.badge-self { background: var(--success-soft); color: var(--success); }
.notice-card { border-left: 4px solid var(--success); }
.notice-card .field { max-width: 36rem; }
dialog.modal .auth-form .field { margin-bottom: 0.5rem; }

/* ---------- responsive ---------- */
@media (max-width: 1000px) {
  .question-layout.split { grid-template-columns: 1fr; }
  .passage-panel { max-height: 45vh; }
}
@media (max-width: 900px) {
  .test-body { grid-template-columns: 1fr; }
  .test-side { position: static; }
  .score-big { font-size: 2.4rem; }
}
@media (max-width: 700px) {
  main.app { padding: 1rem 0.75rem 2.5rem; }
  .hero { padding: 1.25rem; }
  .hero h1 { font-size: 1.6rem; }
  .frames { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .figure-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .timer { font-size: 1.15rem; }
  .test-bar { position: static; }
  .site-header { gap: 0.5rem; padding: 0 0.6rem; }
  .brand-text { display: none; }
  .site-account { padding-left: 0.4rem; gap: 0.3rem; }
  .account-link { padding: 0.2rem; }
  /* the name stays available to screen readers; the avatar initial is what shows */
  .account-name { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; }
  .user-form-grid .field:nth-child(2) { grid-column: auto; }
  .login-card { margin: 1rem auto; padding: 1.25rem; }
}
@media (max-width: 640px) {
  /* users table: one stacked card per account */
  .users-table thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0, 0, 0, 0); }
  .users-table, .users-table tbody, .users-table tr, .users-table td { display: block; width: 100%; }
  .users-table tr { padding: 0.6rem 0; border-bottom: 1px solid var(--border); }
  .users-table tbody tr:hover { background: transparent; }
  .users-table td { display: flex; justify-content: space-between; gap: 1rem; padding: 0.2rem 0; border: 0; text-align: right; }
  .users-table td[data-label]::before { content: attr(data-label); color: var(--muted); font-size: 0.85rem; text-align: left; flex: none; }
  .users-table .actions-cell { justify-content: flex-start; flex-wrap: wrap; gap: 0.4rem; padding-top: 0.5rem; white-space: normal; text-align: left; }
  .users-table .actions-cell .btn { margin-left: 0; }
}
@media (max-width: 480px) {
  .figure-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .option { grid-template-columns: 1.75rem minmax(0, 1fr); }
  .option-tag { grid-column: 2; }
}

/* ---------- print ---------- */
@media print {
  .site-header, .site-footer, .toasts, .no-print, .segmented, .btn, dialog { display: none !important; }
  body { background: #fff; color: #000; }
  main.app { max-width: none; padding: 0; min-height: 0; }
  .card, .review-card, .passage-panel, .question-panel, .data-panel { box-shadow: none; border-color: #999; break-inside: avoid; }
  .passage-panel { max-height: none; overflow: visible; }
  .option.correct { border-color: #000; font-weight: 600; }
  .option.incorrect { border-color: #666; text-decoration: line-through; }
  .review-card { page-break-inside: avoid; }
  a { color: inherit; text-decoration: none; }
}