/* ==========================================================================
   Quiz Portal — design system
   ========================================================================== */

:root {
  --bg: #f5f6fa;
  --surface: #ffffff;
  --surface-2: #f9fafc;
  --surface-hover: #f3f4f8;
  --border: #e3e6ee;
  --border-strong: #cfd4e0;
  --text: #151a2d;
  --text-2: #3d4459;
  --muted: #6a7187;
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-soft: #eef0ff;
  --primary-ring: rgba(79, 70, 229, 0.28);
  --on-primary: #ffffff;
  --success: #0f8a5f;
  --success-soft: #e6f6ef;
  --danger: #d03030;
  --danger-soft: #fdeded;
  --warning: #b86a00;
  --warning-soft: #fff4e2;
  --info: #2563eb;
  --info-soft: #eaf1ff;
  --gold: #c58b00;
  --silver: #7b8494;
  --bronze: #b0652b;
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.05);
  --shadow: 0 1px 3px rgba(16, 24, 40, 0.06), 0 1px 2px rgba(16, 24, 40, 0.04);
  --shadow-lg: 0 12px 32px -8px rgba(16, 24, 40, 0.18), 0 4px 8px -4px rgba(16, 24, 40, 0.08);
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1020;
    --surface: #151a2e;
    --surface-2: #1a2036;
    --surface-hover: #1f2640;
    --border: #2a3150;
    --border-strong: #3a4266;
    --text: #eef0f8;
    --text-2: #c9cde0;
    --muted: #949bb6;
    --primary: #7c74ff;
    --primary-hover: #8f88ff;
    --primary-soft: #232650;
    --primary-ring: rgba(124, 116, 255, 0.35);
    --success: #34c48b;
    --success-soft: #12302a;
    --danger: #ff6b6b;
    --danger-soft: #3a1c22;
    --warning: #f0a83a;
    --warning-soft: #3a2a12;
    --info: #6aa1ff;
    --info-soft: #172a4d;
    --gold: #f2c14e;
    --silver: #b2bac8;
    --bronze: #d98a4e;
    --shadow-lg: 0 12px 32px -8px rgba(0, 0, 0, 0.6);
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { margin: 0; line-height: 1.25; color: var(--text); letter-spacing: -0.01em; }
h1 { font-size: 26px; font-weight: 700; }
h2 { font-size: 19px; font-weight: 650; }
h3 { font-size: 16px; font-weight: 600; }
p { margin: 0; }
.icon { flex-shrink: 0; vertical-align: middle; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.mono { font-family: var(--mono); }
.nowrap { white-space: nowrap; }
.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; }
.hidden { display: none !important; }
.stack > * + * { margin-top: 16px; }
.row { display: flex; align-items: center; gap: 12px; }
.row-wrap { flex-wrap: wrap; }
.spacer { flex: 1; }
:focus-visible { outline: 3px solid var(--primary-ring); outline-offset: 2px; }

/* ---------- Layout ---------- */
.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.container-narrow { max-width: 820px; }
.page { padding: 32px 0 80px; }

.topbar {
  position: sticky; top: 0; z-index: 30;
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border);
}
.topbar-inner { display: flex; align-items: center; gap: 28px; height: 62px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; font-size: 16px; color: var(--text); }
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 30px; height: 30px; border-radius: 9px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--primary), #8b5cf6);
  color: #fff;
}
.nav { display: flex; gap: 4px; }
.nav a {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 8px 12px; border-radius: var(--radius-sm);
  color: var(--muted); font-weight: 500; font-size: 14px;
}
.nav a:hover { background: var(--surface-hover); color: var(--text); text-decoration: none; }
.nav a.active { color: var(--primary); background: var(--primary-soft); }

.page-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; margin-bottom: 28px; flex-wrap: wrap; }
.page-header .subtitle { color: var(--muted); margin-top: 6px; }
.breadcrumb { display: inline-flex; align-items: center; gap: 6px; color: var(--muted); font-size: 14px; margin-bottom: 10px; }
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--text); }
.meta-line { display: flex; flex-wrap: wrap; gap: 6px 18px; color: var(--muted); font-size: 14px; margin-top: 8px; }
.meta-line span { display: inline-flex; align-items: center; gap: 6px; }

/* ---------- Buttons ---------- */
.btn {
  --btn-bg: var(--surface); --btn-fg: var(--text); --btn-border: var(--border-strong);
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 40px; padding: 0 16px;
  font: inherit; font-size: 14px; font-weight: 600; line-height: 1;
  color: var(--btn-fg); background: var(--btn-bg);
  border: 1px solid var(--btn-border); border-radius: var(--radius-sm);
  cursor: pointer; white-space: nowrap; user-select: none;
  transition: background .15s, border-color .15s, box-shadow .15s, transform .05s;
  box-shadow: var(--shadow-sm);
}
.btn:hover { text-decoration: none; background: var(--surface-hover); }
.btn:active { transform: translateY(1px); }
.btn:disabled, .btn[aria-disabled="true"] { opacity: .55; cursor: not-allowed; transform: none; }
.btn-primary { --btn-bg: var(--primary); --btn-fg: var(--on-primary); --btn-border: var(--primary); }
.btn-primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); }
.btn-danger { --btn-bg: var(--danger); --btn-fg: #fff; --btn-border: var(--danger); }
.btn-danger:hover { background: color-mix(in srgb, var(--danger) 88%, #000); }
.btn-ghost { --btn-bg: transparent; --btn-border: transparent; box-shadow: none; color: var(--text-2); }
.btn-ghost:hover { background: var(--surface-hover); }
.btn-ghost.danger { color: var(--danger); }
.btn-ghost.danger:hover { background: var(--danger-soft); }
.btn-sm { height: 32px; padding: 0 11px; font-size: 13px; }
.btn-lg { height: 48px; padding: 0 22px; font-size: 15px; border-radius: 10px; }
.btn-block { width: 100%; }
.btn-icon { width: 36px; padding: 0; }
.btn-icon.btn-sm { width: 32px; }
.btn .spinner { display: none; }
.btn.loading .spinner { display: inline-block; }
.btn.loading { pointer-events: none; opacity: .85; }

.spinner {
  width: 16px; height: 16px; border-radius: 50%;
  border: 2px solid currentColor; border-right-color: transparent;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Cards ---------- */
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); box-shadow: var(--shadow); }
.card-body { padding: 24px; }
.card-header { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 18px 24px; border-bottom: 1px solid var(--border); }
.card-header .desc { color: var(--muted); font-size: 14px; margin-top: 2px; }
.card + .card { margin-top: 20px; }

/* ---------- Forms ---------- */
.field { display: flex; flex-direction: column; gap: 6px; }
.field + .field { margin-top: 18px; }
.label { font-weight: 600; font-size: 14px; color: var(--text); }
.label .opt { color: var(--muted); font-weight: 400; }
.hint { color: var(--muted); font-size: 13px; }
.field-error { color: var(--danger); font-size: 13px; display: flex; align-items: center; gap: 6px; }
.input, .textarea, .select {
  width: 100%;
  font: inherit; font-size: 15px; color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  transition: border-color .15s, box-shadow .15s;
}
.input { height: 42px; }
.textarea { min-height: 96px; resize: vertical; line-height: 1.5; }
.input::placeholder, .textarea::placeholder { color: color-mix(in srgb, var(--muted) 75%, transparent); }
.input:hover, .textarea:hover { border-color: color-mix(in srgb, var(--border-strong) 60%, var(--muted)); }
.input:focus, .textarea:focus, .select:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 4px var(--primary-ring); }
.input.invalid, .textarea.invalid, .has-error .input, .has-error .textarea { border-color: var(--danger); }
.input-group { position: relative; display: flex; align-items: center; }
.input-group .input { padding-right: 44px; }
.input-group .input-addon { position: absolute; right: 4px; }
.input-suffix { display: flex; align-items: stretch; }
.input-suffix .input { border-top-right-radius: 0; border-bottom-right-radius: 0; }
.input-suffix .suffix {
  display: grid; place-items: center; padding: 0 14px;
  border: 1px solid var(--border-strong); border-left: 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: var(--surface-2); color: var(--muted); font-size: 14px;
}
.form-grid { display: grid; gap: 18px; grid-template-columns: 1fr 1fr; }
.form-grid .span-2 { grid-column: span 2; }
.form-grid .field + .field { margin-top: 0; }
.form-actions { display: flex; gap: 10px; justify-content: flex-end; margin-top: 24px; }

.switch-row { display: flex; gap: 12px; align-items: flex-start; cursor: pointer; padding: 10px 0 0; }
.switch-row strong { font-weight: 600; font-size: 14px; }
.switch {
  appearance: none; -webkit-appearance: none; flex-shrink: 0; margin: 1px 0 0;
  width: 40px; height: 24px; border-radius: 999px; position: relative; cursor: pointer;
  background: var(--border-strong); transition: background .15s;
}
.switch::after {
  content: ""; position: absolute; top: 3px; left: 3px; width: 18px; height: 18px; border-radius: 50%;
  background: #fff; box-shadow: 0 1px 2px rgba(0,0,0,.25); transition: transform .15s;
}
.switch:checked { background: var(--primary); }
.switch:checked::after { transform: translateX(16px); }
.switch:disabled { opacity: .5; cursor: not-allowed; }
.switch:focus-visible { outline: 3px solid var(--primary-ring); outline-offset: 2px; }

/* ---------- Badges ---------- */
.badge {
  display: inline-flex; align-items: center; gap: 5px;
  height: 24px; padding: 0 9px; border-radius: 999px;
  font-size: 12px; font-weight: 600; white-space: nowrap;
  background: var(--surface-hover); color: var(--text-2);
}
.badge .dot { width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.badge-success { background: var(--success-soft); color: var(--success); }
.badge-danger { background: var(--danger-soft); color: var(--danger); }
.badge-warning { background: var(--warning-soft); color: var(--warning); }
.badge-info { background: var(--info-soft); color: var(--info); }
.badge-primary { background: var(--primary-soft); color: var(--primary); }
.badge-outline { background: transparent; border: 1px solid var(--border-strong); color: var(--muted); }

/* ---------- Alerts / flash ---------- */
.alert {
  display: flex; gap: 12px; align-items: flex-start;
  padding: 14px 16px; border-radius: var(--radius);
  border: 1px solid transparent; font-size: 14px;
  margin-bottom: 16px;
}
.alert .icon { margin-top: 1px; }
.alert-body { flex: 1; min-width: 0; }
.alert-success { background: var(--success-soft); color: var(--success); border-color: color-mix(in srgb, var(--success) 22%, transparent); }
.alert-error { background: var(--danger-soft); color: var(--danger); border-color: color-mix(in srgb, var(--danger) 22%, transparent); }
.alert-warning { background: var(--warning-soft); color: var(--warning); border-color: color-mix(in srgb, var(--warning) 22%, transparent); }
.alert-info { background: var(--info-soft); color: var(--info); border-color: color-mix(in srgb, var(--info) 22%, transparent); }
.alert-body strong { color: inherit; }
.alert .close { background: none; border: 0; color: inherit; cursor: pointer; opacity: .7; padding: 0; }
.alert .close:hover { opacity: 1; }

/* ---------- Stats ---------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 28px; }
.stats.five { grid-template-columns: repeat(5, 1fr); }
.stat { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 18px 20px; box-shadow: var(--shadow); }
.stat-label { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 13px; font-weight: 500; }
.stat-value { font-size: 28px; font-weight: 700; margin-top: 6px; letter-spacing: -0.02em; }
.stat-value .unit { font-size: 15px; color: var(--muted); font-weight: 500; margin-left: 2px; }

/* ---------- Tables ---------- */
.table-wrap { overflow-x: auto; }
.table { width: 100%; border-collapse: collapse; font-size: 14px; }
.table th {
  text-align: left; font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: .04em;
  color: var(--muted); padding: 12px 16px; background: var(--surface-2); border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.table td { padding: 14px 16px; border-bottom: 1px solid var(--border); vertical-align: middle; }
.table tr:last-child td { border-bottom: 0; }
.table tbody tr { transition: background .1s; }
.table tbody tr:hover { background: var(--surface-2); }
.table .num { text-align: right; font-variant-numeric: tabular-nums; }
.table tr.clickable { cursor: pointer; }
.table th:first-child, .table td:first-child { padding-left: 24px; }
.table th:last-child, .table td:last-child { padding-right: 24px; }

.person { display: flex; align-items: center; gap: 12px; min-width: 0; }
.person-name { font-weight: 600; color: var(--text); }
.person-email { color: var(--muted); font-size: 13px; overflow: hidden; text-overflow: ellipsis; }
.avatar {
  width: 36px; height: 36px; border-radius: 50%; flex-shrink: 0;
  display: grid; place-items: center;
  font-size: 13px; font-weight: 700;
  background: var(--primary-soft); color: var(--primary);
}
.avatar-lg { width: 56px; height: 56px; font-size: 19px; }

.rank {
  display: inline-grid; place-items: center;
  min-width: 32px; height: 32px; padding: 0 8px; border-radius: 999px;
  font-weight: 700; font-size: 14px; background: var(--surface-hover); color: var(--text-2);
  font-variant-numeric: tabular-nums;
}
.rank-1 { background: color-mix(in srgb, var(--gold) 18%, transparent); color: var(--gold); }
.rank-2 { background: color-mix(in srgb, var(--silver) 20%, transparent); color: var(--silver); }
.rank-3 { background: color-mix(in srgb, var(--bronze) 18%, transparent); color: var(--bronze); }

.score-cell { display: flex; align-items: center; gap: 12px; min-width: 170px; }
.score-bar { flex: 1; height: 8px; background: var(--surface-hover); border-radius: 999px; overflow: hidden; min-width: 70px; }
.score-bar > span { display: block; height: 100%; border-radius: inherit; background: var(--primary); }
.score-bar.good > span { background: var(--success); }
.score-bar.mid > span { background: var(--warning); }
.score-bar.low > span { background: var(--danger); }
.score-num { font-weight: 700; font-variant-numeric: tabular-nums; min-width: 44px; text-align: right; }

/* ---------- Tabs ---------- */
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin-bottom: 24px; overflow-x: auto; }
.tab {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 14px; margin-bottom: -1px;
  color: var(--muted); font-weight: 600; font-size: 14px;
  border-bottom: 2px solid transparent; white-space: nowrap;
}
.tab:hover { color: var(--text); text-decoration: none; }
.tab.active { color: var(--primary); border-bottom-color: var(--primary); }
.tab .count { background: var(--surface-hover); color: var(--muted); border-radius: 999px; padding: 1px 8px; font-size: 12px; }
.tab.active .count { background: var(--primary-soft); color: var(--primary); }

/* ---------- Dropdown (details) ---------- */
.dropdown { position: relative; }
.dropdown > summary { list-style: none; }
.dropdown > summary::-webkit-details-marker { display: none; }
.dropdown-menu {
  position: absolute; right: 0; top: calc(100% + 6px); z-index: 40;
  min-width: 220px; padding: 6px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
}
.dropdown-menu.floating { position: fixed; right: auto; z-index: 1000; overflow-y: auto; overscroll-behavior: contain; animation: menu-in .12s ease-out; }
@keyframes menu-in { from { opacity: 0; transform: translateY(-4px); } to { opacity: 1; transform: none; } }
.dropdown-menu form { margin: 0; }
.menu-item {
  display: flex; align-items: center; gap: 10px; width: 100%;
  padding: 9px 10px; border-radius: 7px; border: 0; background: none;
  font: inherit; font-size: 14px; color: var(--text); text-align: left; cursor: pointer;
}
.menu-item:hover { background: var(--surface-hover); text-decoration: none; }
.menu-item.danger { color: var(--danger); }
.menu-item.danger:hover { background: var(--danger-soft); }
.menu-sep { height: 1px; background: var(--border); margin: 6px 0; }
.menu-label { padding: 8px 10px 4px; font-size: 12px; color: var(--muted); }

/* ---------- Modal (dialog) ---------- */
dialog.modal {
  border: 0; padding: 0; border-radius: var(--radius-lg);
  width: min(480px, calc(100vw - 32px));
  background: var(--surface); color: var(--text);
  box-shadow: var(--shadow-lg);
}
dialog.modal::backdrop { background: rgba(10, 14, 30, 0.5); backdrop-filter: blur(2px); }
dialog.modal[open] { animation: pop .16s ease-out; }
@keyframes pop { from { transform: scale(.97); opacity: 0; } to { transform: none; opacity: 1; } }
.modal-body { padding: 24px; }
.modal-icon { width: 44px; height: 44px; border-radius: 50%; display: grid; place-items: center; margin-bottom: 14px; background: var(--primary-soft); color: var(--primary); }
.modal-icon.danger { background: var(--danger-soft); color: var(--danger); }
.modal-icon.warning { background: var(--warning-soft); color: var(--warning); }
.modal-body h3 { font-size: 18px; margin-bottom: 6px; }
.modal-body p { color: var(--text-2); }
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; padding: 16px 24px; background: var(--surface-2); border-top: 1px solid var(--border); border-radius: 0 0 var(--radius-lg) var(--radius-lg); }

/* ---------- Toast ---------- */
.toasts { position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%); z-index: 100; display: flex; flex-direction: column; gap: 8px; align-items: center; pointer-events: none; }
.toast {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 11px 16px; border-radius: 10px;
  background: #1c2136; color: #fff; font-size: 14px; font-weight: 500;
  box-shadow: var(--shadow-lg); animation: toast-in .2s ease-out;
}
.toast.warning { background: var(--warning); }
.toast.danger { background: var(--danger); }
@keyframes toast-in { from { transform: translateY(8px); opacity: 0; } to { transform: none; opacity: 1; } }

/* ---------- Empty state ---------- */
.empty { text-align: center; padding: 56px 24px; }
.empty-icon { width: 56px; height: 56px; border-radius: 16px; display: grid; place-items: center; margin: 0 auto 16px; background: var(--primary-soft); color: var(--primary); }
.empty h3 { font-size: 17px; margin-bottom: 6px; }
.empty p { color: var(--muted); max-width: 420px; margin: 0 auto 20px; }

/* ---------- Quiz cards (dashboard) ---------- */
.quiz-grid > .card { margin-top: 0; }
.quiz-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 18px; }
.quiz-card { display: flex; flex-direction: column; padding: 20px; color: inherit; transition: border-color .15s, box-shadow .15s, transform .15s; }
.quiz-card:hover { text-decoration: none; border-color: color-mix(in srgb, var(--primary) 40%, var(--border)); box-shadow: var(--shadow-lg); transform: translateY(-1px); }
.quiz-card h3 { font-size: 16px; margin: 10px 0 4px; }
.quiz-card .desc { color: var(--muted); font-size: 14px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; min-height: 42px; }
.quiz-card .facts { display: flex; gap: 16px; color: var(--muted); font-size: 13px; margin-top: 14px; }
.quiz-card .facts span { display: inline-flex; align-items: center; gap: 6px; }
.quiz-card .progress-line { margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--border); display: flex; align-items: center; gap: 12px; font-size: 13px; color: var(--muted); }
.progress { height: 6px; background: var(--surface-hover); border-radius: 999px; overflow: hidden; flex: 1; }
.progress > span { display: block; height: 100%; background: var(--primary); border-radius: inherit; transition: width .3s; }

.toolbar { display: flex; gap: 12px; align-items: center; margin-bottom: 18px; flex-wrap: wrap; }
.search { position: relative; flex: 1; max-width: 360px; }
.search .icon { position: absolute; left: 12px; top: 50%; transform: translateY(-50%); color: var(--muted); }
.search .input { padding-left: 38px; }

/* ---------- Auth ---------- */
.auth {
  min-height: 100vh; display: grid; place-items: center; padding: 32px 16px;
  background:
    radial-gradient(1200px 600px at 10% -10%, color-mix(in srgb, var(--primary) 14%, transparent), transparent 60%),
    radial-gradient(900px 500px at 110% 110%, color-mix(in srgb, #8b5cf6 12%, transparent), transparent 60%),
    var(--bg);
}
.auth-card { width: 100%; max-width: 420px; }
.auth-card .card-body { padding: 32px; }
.auth-brand { display: flex; justify-content: center; margin-bottom: 24px; }
.auth-title { text-align: center; margin-bottom: 6px; font-size: 22px; }
.auth-sub { text-align: center; color: var(--muted); margin-bottom: 26px; }
.auth-foot { text-align: center; color: var(--muted); font-size: 13px; margin-top: 18px; }

.quiz-hero { text-align: center; margin-bottom: 24px; }
.quiz-hero .eyebrow { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; color: var(--primary); }
.quiz-hero h1 { font-size: 22px; margin: 8px 0 10px; }
.chips { display: flex; justify-content: center; flex-wrap: wrap; gap: 8px; }
.chip { display: inline-flex; align-items: center; gap: 6px; padding: 5px 11px; border-radius: 999px; background: var(--surface-hover); font-size: 13px; color: var(--text-2); font-weight: 500; }
.readonly-box { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-radius: var(--radius-sm); background: var(--surface-2); border: 1px solid var(--border); color: var(--text-2); font-size: 14px; }

/* ---------- Instructions ---------- */
.rules { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.rules li { display: flex; gap: 14px; align-items: flex-start; }
.rules .r-icon { width: 36px; height: 36px; border-radius: 10px; display: grid; place-items: center; flex-shrink: 0; background: var(--primary-soft); color: var(--primary); }
.rules strong { display: block; color: var(--text); font-size: 15px; }
.rules span { color: var(--muted); font-size: 14px; }

/* ==========================================================================
   Builder
   ========================================================================== */
.builder-layout { display: grid; grid-template-columns: 1fr 260px; gap: 24px; align-items: start; }
.builder-aside { position: sticky; top: 86px; }
.outline { list-style: none; margin: 0; padding: 6px; max-height: 50vh; overflow: auto; }
.outline li a {
  display: flex; gap: 10px; align-items: center; padding: 7px 10px; border-radius: 7px;
  color: var(--text-2); font-size: 13px;
}
.outline li a:hover { background: var(--surface-hover); text-decoration: none; }
.outline .n { min-width: 22px; height: 22px; border-radius: 6px; display: grid; place-items: center; background: var(--surface-hover); font-size: 12px; font-weight: 600; color: var(--muted); }
.outline .t { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; }
.outline .bad .n { background: var(--danger-soft); color: var(--danger); }

.q-card { position: relative; transition: border-color .15s, box-shadow .15s; scroll-margin-top: 90px; }
.q-card:focus-within { border-color: color-mix(in srgb, var(--primary) 45%, var(--border)); box-shadow: 0 0 0 4px var(--primary-ring), var(--shadow); }
.q-card.has-error { border-color: var(--danger); }
.q-card + .q-card { margin-top: 16px; }
.q-head { display: flex; align-items: center; gap: 12px; padding: 14px 16px 14px 20px; border-bottom: 1px solid var(--border); flex-wrap: wrap; }
.q-num { font-weight: 700; color: var(--muted); font-size: 13px; letter-spacing: .04em; text-transform: uppercase; }
.q-tools { margin-left: auto; display: flex; gap: 2px; }
.q-body { padding: 18px 20px 20px; }
.q-errors { margin: 0 20px 16px; padding: 10px 12px; border-radius: var(--radius-sm); background: var(--danger-soft); color: var(--danger); font-size: 13px; }
.q-errors ul { margin: 0; padding-left: 18px; }

.segmented { display: inline-flex; padding: 3px; background: var(--surface-hover); border-radius: 10px; gap: 2px; }
.segmented button {
  display: inline-flex; align-items: center; gap: 6px;
  height: 30px; padding: 0 12px; border: 0; border-radius: 8px;
  background: transparent; color: var(--muted);
  font: inherit; font-size: 13px; font-weight: 600; cursor: pointer;
}
.segmented button:hover { color: var(--text); }
.segmented button[aria-pressed="true"] { background: var(--surface); color: var(--primary); box-shadow: var(--shadow); }

.q-text { font-size: 16px; font-weight: 500; min-height: 60px; }
.opts-label { display: flex; align-items: center; justify-content: space-between; margin: 18px 0 10px; }
.opt-row { display: flex; align-items: center; gap: 10px; }
.opt-row + .opt-row { margin-top: 8px; }
.correct-toggle {
  width: 38px; height: 38px; flex-shrink: 0; display: grid; place-items: center;
  border: 1.5px solid var(--border-strong); background: var(--surface);
  color: transparent; cursor: pointer; transition: all .15s;
}
.correct-toggle.radio { border-radius: 50%; }
.correct-toggle.box { border-radius: 9px; }
.correct-toggle:hover { border-color: var(--success); color: color-mix(in srgb, var(--success) 45%, transparent); }
.correct-toggle[aria-pressed="true"] { background: var(--success); border-color: var(--success); color: #fff; }
.opt-row .input { flex: 1; }
.opt-row.is-correct .input { border-color: color-mix(in srgb, var(--success) 55%, var(--border-strong)); background: color-mix(in srgb, var(--success-soft) 55%, var(--surface)); }
.yesno-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.yesno-opt {
  display: flex; align-items: center; justify-content: center; gap: 10px;
  height: 52px; border-radius: var(--radius); border: 1.5px solid var(--border-strong);
  background: var(--surface); font: inherit; font-weight: 600; font-size: 15px; color: var(--text-2); cursor: pointer;
}
.yesno-opt:hover { border-color: var(--success); }
.yesno-opt[aria-pressed="true"] { border-color: var(--success); background: var(--success-soft); color: var(--success); }
.add-opt { margin-top: 10px; }
.add-question {
  display: flex; align-items: center; justify-content: center; gap: 8px; width: 100%;
  margin-top: 16px; padding: 18px; border-radius: var(--radius-lg);
  border: 2px dashed var(--border-strong); background: transparent;
  color: var(--muted); font: inherit; font-weight: 600; cursor: pointer;
}
.add-question:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-soft); }
.add-menu { display: flex; gap: 10px; margin-top: 16px; flex-wrap: wrap; }
.add-menu .add-question { margin-top: 0; flex: 1; min-width: 180px; }

.has-savebar { padding-bottom: 96px; }
.savebar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 20;
  background: color-mix(in srgb, var(--surface) 92%, transparent); backdrop-filter: blur(8px);
  border-top: 1px solid var(--border);
}
.savebar-inner { display: flex; align-items: center; gap: 12px; padding: 14px 0; }
.savebar .status { color: var(--muted); font-size: 14px; display: flex; align-items: center; gap: 8px; }

/* ==========================================================================
   Taking a quiz
   ========================================================================== */
.take-top { position: sticky; top: 0; z-index: 30; background: var(--surface); border-bottom: 1px solid var(--border); }
.take-top-inner { display: flex; align-items: center; gap: 16px; height: 64px; }
.take-title { font-weight: 650; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0; }
.take-progress { height: 3px; background: var(--surface-hover); }
.take-progress > span { display: block; height: 100%; background: var(--primary); transition: width .3s ease; }
.timer {
  display: inline-flex; align-items: center; gap: 8px; margin-left: auto;
  padding: 7px 14px; border-radius: 999px;
  background: var(--surface-hover); color: var(--text);
  font-weight: 700; font-variant-numeric: tabular-nums; font-size: 15px; letter-spacing: .02em;
  transition: background .3s, color .3s;
}
.timer.warn { background: var(--warning-soft); color: var(--warning); }
.timer.danger { background: var(--danger-soft); color: var(--danger); animation: pulse 1s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: .65; } }
.save-state { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; color: var(--muted); white-space: nowrap; }
.save-state.error { color: var(--danger); }

.take-layout { display: grid; grid-template-columns: 1fr 280px; gap: 24px; padding: 28px 0 60px; align-items: start; }
.question-card .card-body { padding: 32px; }
.q-meta { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 14px; flex-wrap: wrap; }
.q-counter { font-size: 13px; font-weight: 600; color: var(--muted); letter-spacing: .03em; text-transform: uppercase; }
.question-text { font-size: 20px; font-weight: 600; line-height: 1.45; margin-bottom: 24px; white-space: pre-wrap; overflow-wrap: anywhere; }
.choices { display: grid; gap: 10px; }
.choices.yesno { grid-template-columns: 1fr 1fr; }
.choice {
  position: relative; display: flex; align-items: center; gap: 14px;
  padding: 15px 18px; border-radius: var(--radius);
  border: 1.5px solid var(--border); background: var(--surface);
  cursor: pointer; transition: border-color .12s, background .12s, box-shadow .12s;
  font-size: 15.5px; overflow-wrap: anywhere;
}
.choice:hover { border-color: color-mix(in srgb, var(--primary) 45%, var(--border)); background: var(--surface-2); }
.choice input { position: absolute; opacity: 0; pointer-events: none; }
.choice .mark {
  width: 22px; height: 22px; flex-shrink: 0; display: grid; place-items: center;
  border: 2px solid var(--border-strong); background: var(--surface); color: transparent;
  transition: all .12s;
}
.choice .mark.radio { border-radius: 50%; }
.choice .mark.box { border-radius: 6px; }
.choice .key { margin-left: auto; font-size: 12px; color: var(--muted); border: 1px solid var(--border); border-radius: 5px; padding: 1px 6px; font-family: var(--mono); }
.choice:has(input:checked) { border-color: var(--primary); background: var(--primary-soft); box-shadow: 0 0 0 1px var(--primary) inset; }
.choice:has(input:checked) .mark { border-color: var(--primary); background: var(--primary); color: #fff; }
.choice:has(input:focus-visible) { outline: 3px solid var(--primary-ring); outline-offset: 2px; }
.choices.yesno .choice { justify-content: center; padding: 20px; font-weight: 600; font-size: 16px; }
.choices.yesno .choice .key { display: none; }

.q-nav { display: flex; align-items: center; gap: 10px; margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--border); }

.navigator .card-body { padding: 18px; }
.navigator h3 { font-size: 14px; margin-bottom: 4px; }
.nav-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; margin: 14px 0; }
.nav-btn {
  aspect-ratio: 1; border-radius: 9px; border: 1.5px solid var(--border);
  background: var(--surface); color: var(--text-2);
  font: inherit; font-size: 13px; font-weight: 600; cursor: pointer;
  display: grid; place-items: center; position: relative;
}
.nav-btn:hover { border-color: var(--primary); }
.nav-btn.answered { background: var(--primary-soft); border-color: transparent; color: var(--primary); }
.nav-btn.current { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-ring); }
.nav-btn.flagged::after { content: ""; position: absolute; top: 4px; right: 4px; width: 7px; height: 7px; border-radius: 50%; background: var(--warning); }
.legend { display: flex; flex-wrap: wrap; gap: 6px 14px; font-size: 12px; color: var(--muted); }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.legend i { width: 12px; height: 12px; border-radius: 4px; display: inline-block; border: 1.5px solid var(--border); }
.legend i.a { background: var(--primary-soft); border-color: transparent; }
.legend i.f { background: var(--warning); border-color: transparent; border-radius: 50%; width: 8px; height: 8px; }
.flag-btn[aria-pressed="true"] { color: var(--warning); background: var(--warning-soft); }

.mobile-nav-toggle { display: none; }

.overlay {
  position: fixed; inset: 0; z-index: 90; display: grid; place-items: center;
  background: rgba(10, 14, 30, .55); backdrop-filter: blur(3px);
}
.overlay-card { background: var(--surface); border-radius: var(--radius-lg); padding: 32px; text-align: center; max-width: 380px; box-shadow: var(--shadow-lg); }
.overlay-card .spinner { width: 28px; height: 28px; border-width: 3px; color: var(--primary); margin: 0 auto 16px; }

/* ---------- Results ---------- */
.result-hero { text-align: center; padding: 36px 24px; }
.score-ring { width: 148px; height: 148px; margin: 0 auto 18px; position: relative; }
.score-ring svg { transform: rotate(-90deg); }
.score-ring .ring-bg { stroke: var(--surface-hover); }
.score-ring .ring-fg { stroke: var(--primary); transition: stroke-dashoffset 1s ease; }
.score-ring.good .ring-fg { stroke: var(--success); }
.score-ring.mid .ring-fg { stroke: var(--warning); }
.score-ring.low .ring-fg { stroke: var(--danger); }
.score-ring .ring-label { position: absolute; inset: 0; display: grid; place-content: center; text-align: center; }
.score-ring .pct { font-size: 34px; font-weight: 800; letter-spacing: -0.03em; line-height: 1; }
.score-ring .of { font-size: 13px; color: var(--muted); margin-top: 4px; }
.result-facts { display: flex; justify-content: center; flex-wrap: wrap; gap: 10px; margin-top: 16px; }

.review-item { padding: 22px 24px; border-bottom: 1px solid var(--border); }
.review-item:last-child { border-bottom: 0; }
.review-head { display: flex; gap: 14px; align-items: flex-start; }
.review-status { width: 30px; height: 30px; border-radius: 50%; display: grid; place-items: center; flex-shrink: 0; }
.review-status.ok { background: var(--success-soft); color: var(--success); }
.review-status.bad { background: var(--danger-soft); color: var(--danger); }
.review-status.none { background: var(--surface-hover); color: var(--muted); }
.review-q { font-weight: 600; font-size: 15.5px; white-space: pre-wrap; overflow-wrap: anywhere; }
.review-type { font-size: 12px; color: var(--muted); margin-top: 2px; }
.review-opts { list-style: none; margin: 14px 0 0 44px; padding: 0; display: grid; gap: 6px; }
.review-opts li {
  display: flex; align-items: center; gap: 10px; padding: 9px 12px; border-radius: 9px;
  font-size: 14.5px; border: 1px solid var(--border); background: var(--surface); overflow-wrap: anywhere;
}
.review-opts li .tag { margin-left: auto; display: flex; gap: 6px; }
.review-opts li.correct { border-color: color-mix(in srgb, var(--success) 45%, transparent); background: var(--success-soft); }
.review-opts li.chosen-wrong { border-color: color-mix(in srgb, var(--danger) 45%, transparent); background: var(--danger-soft); }
.review-opts .sel { width: 18px; height: 18px; flex-shrink: 0; display: grid; place-items: center; border: 2px solid var(--border-strong); color: transparent; }
.review-opts .sel.radio { border-radius: 50%; }
.review-opts .sel.box { border-radius: 5px; }
.review-opts .sel.on { background: var(--text-2); border-color: var(--text-2); color: var(--surface); }
.filter-pills { display: flex; gap: 6px; flex-wrap: wrap; }
.pill {
  height: 32px; padding: 0 12px; border-radius: 999px; border: 1px solid var(--border-strong); background: var(--surface);
  font: inherit; font-size: 13px; font-weight: 600; color: var(--text-2); cursor: pointer;
}
.pill[aria-pressed="true"] { background: var(--text); border-color: var(--text); color: var(--surface); }

.share-panel { margin-bottom: 20px; border-color: color-mix(in srgb, var(--primary) 35%, var(--border)); }
.share-row {
  display: grid; grid-template-columns: minmax(0, 1.3fr) auto auto; gap: 16px; align-items: center;
  padding: 14px 24px; border-bottom: 1px solid var(--border);
}
.share-row.shared { background: color-mix(in srgb, var(--success-soft) 45%, transparent); }
.share-cred { display: flex; flex-direction: column; gap: 2px; }
.share-cred code { font-size: 15px; font-weight: 600; letter-spacing: .04em; }
.share-actions { display: flex; gap: 6px; flex-wrap: wrap; justify-content: flex-end; }
.share-status:empty { display: none; }
@media (max-width: 760px) {
  .share-row { grid-template-columns: 1fr; gap: 10px; padding: 14px 18px; }
  .share-actions { justify-content: flex-start; }
}
.copy-btn { color: var(--muted); }

.split { display: grid; grid-template-columns: 1fr 1.4fr; gap: 24px; align-items: start; }
/* Grid columns may shrink below their content's width (prevents sideways page scroll on phones). */
.split > *, .builder-layout > *, .take-layout > *, .form-grid > *, .quiz-grid > * { min-width: 0; }
.recipient-preview { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; min-height: 24px; }
.recipient-preview .badge { max-width: 100%; overflow: hidden; text-overflow: ellipsis; }

.footer-note { text-align: center; color: var(--muted); font-size: 13px; padding: 24px 0; }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .builder-layout, .take-layout, .split { grid-template-columns: 1fr; }
  .builder-aside { display: none; }
  .stats, .stats.five { grid-template-columns: repeat(2, 1fr); }
  .navigator { order: -1; }
  .take-layout .navigator { display: none; }
  .take-layout .navigator.open { display: block; }
  .mobile-nav-toggle { display: inline-flex; }
}
@media (max-width: 640px) {
  .container { padding: 0 16px; }
  .page { padding: 20px 0 64px; }
  h1 { font-size: 22px; }
  .topbar-inner { gap: 12px; }
  .nav a span { display: none; }
  .brand-text { display: none; }
  .form-grid { grid-template-columns: 1fr; }
  .form-grid .span-2 { grid-column: auto; }
  .question-card .card-body { padding: 22px 18px; }
  .question-text { font-size: 18px; }
  .choices.yesno { grid-template-columns: 1fr; }
  .choice .key { display: none; }
  .review-opts { margin-left: 0; }
  .table th:first-child, .table td:first-child { padding-left: 16px; }
  .table th:last-child, .table td:last-child { padding-right: 16px; }
  .hide-sm { display: none !important; }
  .card-body { padding: 18px; }
  .card-header { padding: 16px 18px; }
  .auth-card .card-body { padding: 24px; }
  .take-title { font-size: 14px; }
  .save-state .txt { display: none; }
  .q-head .segmented button span { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

/* Per-question statistics on the Questions tab */
.q-stat { flex-shrink: 0; width: 180px; text-align: right; }
.q-stat .score-cell { justify-content: flex-end; }
@media (max-width: 640px) {
  .review-head:has(.q-stat) { flex-wrap: wrap; }
  .q-stat { width: 100%; text-align: left; padding-left: 44px; }
  .q-stat .score-cell { justify-content: flex-start; }
}

/* Radio cards (builder: what participants see afterwards) */
.choice-cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }
.choice-card {
  display: flex; gap: 10px; align-items: flex-start; padding: 12px 14px; cursor: pointer;
  border: 1px solid var(--border-strong); border-radius: var(--radius-sm); background: var(--surface);
  transition: border-color .15s, background .15s;
}
.choice-card:hover { border-color: var(--primary); }
.choice-card:has(input:checked) { border-color: var(--primary); background: var(--primary-soft); box-shadow: 0 0 0 1px var(--primary) inset; }
.choice-card input { margin: 3px 0 0; accent-color: var(--primary); flex-shrink: 0; }
.choice-card strong { display: block; font-size: 14px; font-weight: 600; }
.choice-card .hint { display: block; margin-top: 2px; }
@media (max-width: 760px) { .choice-cards { grid-template-columns: 1fr; } }

/* Import questions dialog */
dialog.modal.modal-wide { width: min(820px, calc(100vw - 32px)); }
.import-grid { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); gap: 18px; margin-top: 16px; }
.import-grid .textarea { font-size: 13px; min-height: 260px; }
.import-help ul { margin: 8px 0 0; padding-left: 18px; line-height: 1.7; }
.import-summary { margin-top: 14px; font-size: 14px; }
.import-summary:empty { display: none; }
.import-summary ul { margin: 6px 0 0; padding-left: 18px; color: var(--warning); }
@media (max-width: 760px) { .import-grid { grid-template-columns: 1fr; } .import-grid .textarea { min-height: 200px; } }
.question-text:focus { outline: none; }