/* ═══════════════════════════════════════════════
   Provat Design System
   ═══════════════════════════════════════════════ */

:root {
  --bg: #f8f9fc;
  --panel: #ffffff;
  --ink: #1a1d26;
  --ink-secondary: #4b5063;
  --muted: #6c7189;
  --primary: #1a6d5d;
  --primary-light: #e8f5f1;
  --primary-hover: #145a4c;
  --accent: #1a9d8f;
  --accent-light: #e6f7f5;
  --danger: #dc3545;
  --danger-light: #fef2f2;
  --warning: #e9a820;
  --warning-light: #fffbeb;
  --line: #e2e5ed;
  --line-light: #f0f1f5;
  --success-bg: #ecfdf5;
  --success-border: #86efac;
  --error-bg: #fef2f2;
  --error-border: #fca5a5;
  --warning-bg: #fffbeb;
  --warning-border: #fcd34d;
  --correct-row: #f0fdf4;
  --incorrect-row: #fef2f2;
  --ambiguous-row: #fffbeb;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06), 0 1px 4px rgba(0, 0, 0, 0.03);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.08), 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 48px rgba(0, 0, 0, 0.1), 0 4px 12px rgba(0, 0, 0, 0.05);
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.5;
}

/* ─── Topbar ─── */
.topbar {
  background: var(--panel);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  background: rgba(255, 255, 255, 0.92);
}

.topbar-inner {
  max-width: 1260px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.topbar-controls {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.topbar-controls nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.topbar-controls nav a {
  color: var(--ink-secondary);
  text-decoration: none;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 500;
  transition: all var(--transition);
}

.topbar-controls nav a:hover {
  color: var(--ink);
  background: var(--line-light);
}

.topbar-controls nav a.nav-active {
  color: var(--primary);
  background: var(--primary-light);
  font-weight: 600;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
}

.brand-logo {
  height: 32px;
  width: auto;
}

.brand-name {
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.04em;
  color: var(--primary);
}

.language-switcher {
  display: flex;
  align-items: center;
  gap: 4px;
  background: var(--line-light);
  border-radius: 999px;
  padding: 3px;
}

.account-chip {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 6px 8px 6px 14px;
  border-radius: 999px;
  background: var(--line-light);
  border: 1px solid var(--line);
}

.account-info strong {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--ink);
}

.account-info span {
  display: block;
  font-size: 0.7rem;
  color: var(--muted);
}

.language-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  padding: 5px 10px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--muted);
  text-decoration: none;
  transition: all var(--transition);
}

.language-pill:hover {
  color: var(--ink);
  background: rgba(0, 0, 0, 0.04);
}

.language-pill.is-active {
  background: var(--panel);
  color: var(--primary);
  box-shadow: var(--shadow-sm);
}

@media (max-width: 720px) {
  .topbar-inner {
    flex-direction: column;
    align-items: flex-start;
    height: auto;
    padding: 12px 16px;
    gap: 10px;
  }

  .topbar-controls {
    align-items: flex-start;
  }
}

/* ─── Container ─── */
.container {
  max-width: 1260px;
  margin: 0 auto;
  padding: 28px 24px 100px;
}

/* ─── Breadcrumbs ─── */
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 0;
  font-size: 0.84rem;
  color: var(--muted);
  flex-wrap: wrap;
}

.breadcrumbs a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
}

.breadcrumbs a:hover {
  text-decoration: underline;
}

.breadcrumbs .sep {
  color: var(--line);
  user-select: none;
}

.breadcrumbs .current {
  color: var(--ink);
  font-weight: 600;
}

/* ─── Flash Messages ─── */
.flash {
  padding: 12px 16px;
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  font-size: 0.875rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 10px;
  animation: flash-in 0.35s ease;
}

.flash-success {
  background: var(--success-bg);
  border: 1px solid var(--success-border);
  color: #065f46;
}

.flash-error {
  background: var(--error-bg);
  border: 1px solid var(--error-border);
  color: #991b1b;
}

.flash-warning {
  background: var(--warning-bg);
  border: 1px solid var(--warning-border);
  color: #92400e;
}

.flash .flash-close {
  margin-left: auto;
  background: none;
  border: none;
  color: inherit;
  cursor: pointer;
  font-size: 1.1rem;
  padding: 0 4px;
  opacity: 0.5;
  transition: opacity var(--transition);
}

.flash .flash-close:hover {
  opacity: 1;
}

@keyframes flash-in {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ─── Panel ─── */
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.question-lane {
  background: var(--line-light);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 16px;
  min-height: 280px;
  margin-top: 18px;
}

.exam-question-lane {
  margin-top: 18px;
}

.question-bank-lane {
  background: var(--accent-light);
  margin-top: 0;
}

.question-lane-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 12px;
}

.question-lane-header h2 {
  margin: 0;
  font-size: 1.05rem;
}

.question-lane-header p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 0.875rem;
}

.question-list:empty::before {
  content: "No questions yet.";
  display: block;
  padding: 24px 16px;
  border: 2px dashed var(--line);
  border-radius: var(--radius-md);
  color: var(--muted);
  font-size: 0.875rem;
  text-align: center;
  background: rgba(255, 255, 255, 0.6);
}

.question-card-actions {
  margin: 8px 0 10px;
}

.question-card-actions .move-question-btn {
  min-width: 140px;
}

.question-bank-panel {
  margin-top: 16px;
}

.question-bank-panel summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  padding: 14px 16px;
  background: var(--accent-light);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  font-weight: 600;
}

.question-bank-panel[open] summary {
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
}

.question-bank-panel .details-content {
  border: 1px solid var(--line);
  border-top: none;
  border-bottom-left-radius: var(--radius-lg);
  border-bottom-right-radius: var(--radius-lg);
  padding: 16px;
  background: #f9fcfb;
}

.question-bank-copy {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 0.875rem;
}

/* ─── Analytics ─── */
.analytics-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.analytics-panel {
  overflow: visible;
}

.analytics-chart-tooltip {
  position: fixed;
  top: 0;
  left: 0;
  max-width: min(320px, calc(100vw - 24px));
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background: rgba(26, 29, 38, 0.96);
  color: #fff;
  font-size: 0.78rem;
  line-height: 1.4;
  box-shadow: var(--shadow-lg);
  pointer-events: none;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.12s ease, transform 0.12s ease;
  z-index: 400;
  white-space: normal;
}

.analytics-chart-tooltip.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.analytics-chart-tooltip-title {
  margin: 0 0 4px;
  font-weight: 700;
}

.analytics-chart-tooltip-line {
  margin: 0;
}

.analytics-toolbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.analytics-toolbar h1 {
  margin: 0;
}

.analytics-meta {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.analytics-empty-state h2 {
  margin: 0 0 8px;
  color: var(--ink);
}

.analytics-item-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 16px;
  background: var(--panel);
  min-width: 0;
  overflow: visible;
  transition: box-shadow var(--transition);
}

.analytics-item-card:hover {
  box-shadow: var(--shadow-md);
}

.analytics-item-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
}

.analytics-item-title-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.analytics-question-chip {
  position: relative;
  border: 1px solid rgba(26, 109, 93, 0.18);
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: help;
  white-space: nowrap;
}

.analytics-question-chip[data-tooltip-side="left"] .analytics-question-tooltip {
  left: 0;
  transform: translateY(-4px);
}

.analytics-question-chip[data-tooltip-side="right"] .analytics-question-tooltip {
  left: auto;
  right: 0;
  transform: translateY(-4px);
}

.analytics-question-chip:focus-visible {
  outline: 2px solid rgba(26, 109, 93, 0.4);
  outline-offset: 2px;
}

.analytics-question-tooltip {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  width: min(320px, 72vw);
  padding: 12px 14px;
  border-radius: var(--radius-md);
  background: var(--ink);
  color: #fff;
  font-size: 0.8rem;
  line-height: 1.45;
  box-shadow: var(--shadow-xl);
  opacity: 0;
  pointer-events: none;
  transform: translateX(-50%) translateY(-4px);
  transition: opacity 0.16s ease, transform 0.16s ease;
  z-index: 20;
  white-space: normal;
}

.analytics-question-chip:hover .analytics-question-tooltip,
.analytics-question-chip:focus-visible .analytics-question-tooltip {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.analytics-question-chip[data-tooltip-side="left"]:hover .analytics-question-tooltip,
.analytics-question-chip[data-tooltip-side="left"]:focus-visible .analytics-question-tooltip,
.analytics-question-chip[data-tooltip-side="right"]:hover .analytics-question-tooltip,
.analytics-question-chip[data-tooltip-side="right"]:focus-visible .analytics-question-tooltip {
  transform: translateY(0);
}

.analytics-metrics-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.analytics-metric {
  font-size: 0.8rem;
}

.analytics-chart-wrap {
  height: 180px;
  overflow: visible;
}

.analytics-legend {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 0.76rem;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.analytics-legend-swatch {
  width: 10px;
  height: 10px;
  border-radius: 3px;
  display: inline-block;
  margin-right: 4px;
}

.analytics-legend-swatch-correct {
  background: var(--accent);
}

.analytics-legend-swatch-distractor {
  background: #e76f51;
}

.analytics-legend-swatch-no-response {
  background: #e9c46a;
}

/* ─── Layout ─── */
.row {
  display: flex;
  align-items: center;
}

.wrap {
  flex-wrap: wrap;
}

.gap {
  gap: 10px;
}

.gap-lg {
  gap: 16px;
}

/* ─── Stat Cards ─── */
.stat-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 14px;
  margin-bottom: 20px;
}

.stat-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 18px;
  text-align: center;
  transition: all var(--transition);
}

.stat-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.stat-card .stat-value {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.2;
}

.stat-card .stat-label {
  font-size: 0.75rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
  margin-top: 4px;
}

.stat-card.accent .stat-value {
  color: var(--accent);
}

.stat-card.danger .stat-value {
  color: var(--danger);
}

.stat-card.warning .stat-value {
  color: var(--warning);
}

/* ─── Forms ─── */
label {
  display: block;
  font-weight: 600;
  font-size: 0.875rem;
  margin: 10px 0 4px;
  color: var(--ink);
}

input[type="text"],
input[type="number"],
input[type="file"],
input[type="search"],
input[type="email"],
input[type="password"],
textarea,
select {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--panel);
  font-size: 0.875rem;
  font-family: inherit;
  color: var(--ink);
  transition: all var(--transition);
}

input[type="text"]::placeholder,
input[type="number"]::placeholder,
input[type="search"]::placeholder,
input[type="email"]::placeholder,
input[type="password"]::placeholder,
textarea::placeholder {
  color: #9ca3af;
}

input[type="text"]:focus,
input[type="number"]:focus,
input[type="search"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(26, 109, 93, 0.12);
}

/* ─── Buttons ─── */
button,
.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 9px 16px;
  text-decoration: none;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.84rem;
  font-family: inherit;
  transition: all var(--transition);
  white-space: nowrap;
}

button:hover,
.button-link:hover {
  background: var(--primary-hover);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}

button:active,
.button-link:active {
  transform: translateY(0);
  box-shadow: none;
}

.btn-accent {
  background: var(--accent);
  color: #fff;
}

.btn-accent:hover {
  background: #158a7e;
}

.btn-secondary {
  background: var(--line-light);
  color: var(--ink);
  border: 1px solid var(--line);
}

.btn-secondary:hover {
  background: #e5e7eb;
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 1.5px solid var(--primary);
}

.btn-outline:hover {
  background: var(--primary);
  color: #fff;
}

.btn-danger {
  background: var(--danger);
  color: #fff;
}

.btn-danger:hover {
  background: #c82333;
}

.btn-ghost {
  background: transparent;
  color: var(--ink-secondary);
  border: 1px solid var(--line);
  font-weight: 500;
}

.btn-ghost:hover {
  background: var(--line-light);
  color: var(--ink);
}

.btn-sm {
  padding: 5px 12px;
  font-size: 0.78rem;
}

.visibility-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.visibility-toggle-icon {
  font-size: 0.95rem;
  line-height: 1;
}

.btn-lg {
  padding: 12px 24px;
  font-size: 0.95rem;
  border-radius: var(--radius-md);
}

button[disabled] {
  cursor: not-allowed;
  opacity: 0.5;
  transform: none !important;
  box-shadow: none !important;
}

/* ─── Badges ─── */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.badge-success {
  background: #dcfce7;
  color: #166534;
}

.badge-warning {
  background: #fef3c7;
  color: #92400e;
}

.badge-danger {
  background: #fee2e2;
  color: #991b1b;
}

.badge-info {
  background: #dbeafe;
  color: #1e40af;
}

.badge-muted {
  background: var(--line-light);
  color: var(--muted);
}

/* ─── Tables ─── */
table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin-top: 8px;
}

th,
td {
  border-bottom: 1px solid var(--line-light);
  padding: 10px 12px;
  text-align: left;
  font-size: 0.875rem;
}

th {
  background: var(--line-light);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
}

th:first-child {
  border-top-left-radius: var(--radius-sm);
}

th:last-child {
  border-top-right-radius: var(--radius-sm);
}

tbody tr {
  transition: background var(--transition);
}

tbody tr:hover {
  background: var(--line-light);
}

.table-row-correct {
  background: var(--correct-row);
}

.table-row-incorrect {
  background: var(--incorrect-row);
}

.table-row-ambiguous {
  background: var(--ambiguous-row);
}

/* ─── Status icons (CSS-only) ─── */
.icon-check::before { content: "\2713"; color: #059669; font-weight: 700; }
.icon-x::before { content: "\2717"; color: var(--danger); font-weight: 700; }
.icon-warn::before { content: "\26A0"; color: var(--warning); }

/* ─── Score bar ─── */
.score-bar {
  display: inline-block;
  width: 60px;
  height: 6px;
  background: var(--line);
  border-radius: 3px;
  overflow: hidden;
  vertical-align: middle;
  margin-left: 6px;
}

.score-bar-fill {
  height: 100%;
  border-radius: 3px;
  transition: width 0.3s;
}

.sensitive-cell {
  position: relative;
  white-space: nowrap;
}

.grade-percentage-content {
  display: inline-flex;
  align-items: center;
}

.grade-mask {
  display: none;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.grades-hidden .grade-sensitive {
  display: none !important;
}

.grades-hidden .grade-mask {
  display: inline-flex;
  align-items: center;
}

/* ─── Confidence colors ─── */
.confidence-high { color: #059669; font-weight: 600; }
.confidence-mid { color: #d97706; font-weight: 600; }
.confidence-low { color: var(--danger); font-weight: 600; }

/* ─── Difficulty / Discrimination indicators ─── */
.diff-good { color: #059669; }
.diff-moderate { color: #d97706; }
.diff-extreme { color: var(--danger); }

.disc-good { color: #059669; }
.disc-fair { color: #d97706; }
.disc-poor { color: var(--danger); }

.interp-label {
  font-size: 0.75rem;
  font-weight: 600;
  margin-left: 4px;
}

/* ─── Question cards ─── */
.question-card,
.question-view,
.item-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 14px;
  margin-top: 10px;
  background: var(--panel);
}

.question-card.review-focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(26, 157, 143, 0.15);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.panel-accent {
  border-color: rgba(26, 109, 93, 0.15);
  background:
    radial-gradient(ellipse at top right, rgba(26, 157, 143, 0.08), transparent 50%),
    var(--panel);
}

.review-assistant {
  margin-top: 22px;
}

.review-assistant-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(280px, 420px);
  gap: 24px;
  align-items: start;
}

.review-assistant-copy h2 {
  margin: 6px 0 10px;
  font-size: 1.4rem;
  line-height: 1.2;
}

.review-assistant-copy p {
  margin: 0;
  max-width: 60ch;
  color: var(--muted);
}

.review-kicker,
.review-summary-kicker,
.review-status-eyebrow,
.review-card-kicker {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary);
}

.review-control-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  padding: 18px;
  background: var(--panel);
  box-shadow: var(--shadow-lg);
  display: grid;
  gap: 14px;
}

.review-control-group {
  display: grid;
  gap: 8px;
}

.review-control-label {
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--ink);
}

.segmented-control {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 8px;
}

.segmented-option {
  background: var(--line-light);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 999px;
  min-width: 110px;
  text-align: center;
}

.segmented-option.is-active {
  background: var(--primary);
  border-color: transparent;
  color: #fff;
  box-shadow: 0 4px 12px rgba(26, 109, 93, 0.25);
}

.review-run-btn {
  width: 100%;
}

.review-status-strip {
  margin-top: 18px;
  border-radius: var(--radius-lg);
  padding: 14px 18px;
  border: 1px solid var(--line);
  background: var(--panel);
}

.review-status-strip p {
  margin: 6px 0 0;
}

.review-status-neutral {
  background: var(--panel);
}

.review-status-loading {
  border-color: rgba(26, 109, 93, 0.24);
  background: var(--primary-light);
}

.review-status-success {
  border-color: var(--success-border);
  background: var(--success-bg);
}

.review-status-error {
  border-color: var(--error-border);
  background: var(--error-bg);
}

.review-summary {
  margin-top: 16px;
}

.review-summary-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 10px;
  margin-bottom: 12px;
}

.review-summary-header h3 {
  margin: 6px 0 0;
}

.review-summary-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.review-summary-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 16px;
  background: var(--panel);
  display: grid;
  gap: 4px;
}

.review-summary-card strong {
  font-size: 1.4rem;
  line-height: 1;
}

.review-summary-card span {
  color: var(--muted);
  font-size: 0.84rem;
}

.review-results {
  margin-top: 18px;
  display: grid;
  gap: 16px;
}

.review-empty-state {
  border: 2px dashed var(--line);
  border-radius: var(--radius-lg);
  padding: 24px;
  background: var(--line-light);
  text-align: center;
}

.review-empty-state h3 {
  margin: 0 0 8px;
}

.review-empty-state p {
  margin: 0;
  color: var(--muted);
}

.review-loading-state {
  position: relative;
  overflow: hidden;
}

.review-loading-state::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.65), transparent);
  transform: translateX(-100%);
  animation: review-shimmer 1.5s infinite;
}

.review-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  padding: 20px;
  background: var(--panel);
  box-shadow: var(--shadow-md);
}

.review-card-error {
  border-color: rgba(220, 53, 69, 0.22);
}

.review-card-header {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 12px;
}

.review-card-header h3 {
  margin: 6px 0 0;
  font-size: 1.05rem;
  line-height: 1.35;
}

.review-card-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.review-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 5px 10px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.review-badge-outline {
  border: 1px solid var(--line);
  color: var(--ink);
  background: var(--panel);
}

.review-badge-success {
  background: #dcfce7;
  color: #166534;
}

.review-badge-warning {
  background: #fef3c7;
  color: #92400e;
}

.review-badge-danger {
  background: #fee2e2;
  color: #991b1b;
}

.review-badge-muted {
  background: var(--line-light);
  color: var(--muted);
}

.review-meta-grid {
  margin-top: 14px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.review-meta-card,
.review-section {
  border: 1px solid var(--line-light);
  border-radius: var(--radius-md);
  padding: 14px;
  background: var(--panel);
}

.review-meta-card span,
.review-section h4 {
  display: block;
  margin: 0;
  color: var(--muted);
}

.review-meta-card strong {
  display: block;
  margin-top: 6px;
  font-size: 1.1rem;
}

.review-meta-card p,
.review-section p {
  margin: 10px 0 0;
  line-height: 1.55;
}

.review-sections {
  margin-top: 14px;
  display: grid;
  gap: 12px;
}

.review-section h4 {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--ink);
}

.review-list {
  margin: 10px 0 0;
  padding-left: 18px;
  display: grid;
  gap: 8px;
}

.review-list li {
  line-height: 1.5;
}

.review-muted {
  color: var(--muted);
}

.review-rewrite-block {
  display: grid;
  gap: 12px;
}

.review-rewrite-stem {
  font-weight: 600;
}

.review-option-grid {
  display: grid;
  gap: 8px;
}

.review-option-pill {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  background: var(--line-light);
  border: 1px solid var(--line);
}

.review-option-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--primary);
  font-weight: 700;
}

.review-rewrite-note,
.review-error-copy {
  color: var(--muted);
}

.review-card-footer {
  margin-top: 14px;
  display: flex;
  justify-content: flex-end;
}

.options-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 6px;
  margin-top: 6px;
}

.inline-form {
  display: flex;
  gap: 8px;
  align-items: flex-end;
}

/* ─── Images row ─── */
.images-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.review-image {
  width: 100%;
  max-height: 650px;
  object-fit: contain;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  cursor: zoom-in;
  transition: box-shadow var(--transition);
}

.review-image:hover {
  box-shadow: var(--shadow-md);
}

.question-action-cell {
  width: 110px;
}

.question-review-title {
  font-weight: 600;
  line-height: 1.4;
}

.question-review-panel {
  display: grid;
  gap: 10px;
}

.question-review-image {
  display: block;
  max-width: 240px;
  max-height: 160px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  margin-top: 10px;
}

.question-review-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

.question-review-label {
  display: block;
  margin-top: 12px;
  font-size: 0.875rem;
  font-weight: 600;
}

.question-review-form-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 8px;
}

.question-review-form-row select {
  min-width: 260px;
  flex: 1 1 320px;
}

.question-review-save-status {
  min-height: 1.25rem;
  margin-top: 6px;
  font-size: 0.84rem;
  color: var(--muted);
}

.question-review-options {
  display: grid;
  gap: 6px;
  margin-top: 10px;
}

.question-review-option {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  background: var(--panel);
}

.question-review-option.is-selected {
  border-color: #93c5fd;
  background: #eff6ff;
}

.question-review-option.is-correct {
  box-shadow: inset 0 0 0 1px #86efac;
}

.question-review-option-label {
  width: 24px;
  height: 24px;
  border-radius: 999px;
  background: var(--primary-light);
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.8rem;
}

.question-review-option-flags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 6px;
}

/* ─── Image zoom modal ─── */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.85);
  z-index: 1000;
  cursor: zoom-out;
  justify-content: center;
  align-items: center;
}

.modal-overlay.active {
  display: flex;
}

.modal-overlay img {
  max-width: 95%;
  max-height: 95%;
  object-fit: contain;
  border-radius: var(--radius-sm);
}

@media (max-width: 900px) {
  .images-row {
    grid-template-columns: 1fr;
  }

  .question-action-cell {
    width: auto;
  }
}

/* ─── Dropzone ─── */
.dropzone {
  border: 2px dashed var(--line);
  border-radius: var(--radius-lg);
  padding: 40px 20px;
  text-align: center;
  color: var(--muted);
  transition: all var(--transition);
  cursor: pointer;
  background: var(--line-light);
}

.dropzone:hover,
.dropzone.drag-over {
  border-color: var(--accent);
  background: var(--accent-light);
  color: var(--accent);
}

.dropzone .dropzone-icon {
  font-size: 2.5rem;
  margin-bottom: 10px;
  display: block;
}

.dropzone .dropzone-text {
  font-size: 0.95rem;
  font-weight: 500;
}

.dropzone .dropzone-hint {
  font-size: 0.8rem;
  margin-top: 6px;
  opacity: 0.7;
}

.dropzone input[type="file"] {
  display: none;
}

.file-list {
  margin-top: 10px;
  font-size: 0.84rem;
  color: var(--ink);
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.file-list-item {
  padding: 4px 10px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 999px;
  font-weight: 500;
  font-size: 0.78rem;
}

.manual-assignment-banner {
  margin-top: 16px;
  border: 1px solid var(--warning-border);
  background: var(--warning-bg);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.manual-scan-grid {
  display: grid;
  gap: 16px;
}

.manual-scan-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 16px;
  background: var(--panel);
}

.manual-scan-body {
  min-width: 0;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.manual-scan-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
}

.manual-scan-error {
  margin: 12px 0;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  background: var(--error-bg);
  border: 1px solid var(--error-border);
  color: #991b1b;
  font-size: 0.875rem;
}

.manual-assign-form {
  display: grid;
  gap: 8px;
}

/* ─── Sticky bar ─── */
.sticky-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  border-top: 1px solid var(--line);
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  z-index: 50;
  box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.06);
}

/* ─── Details / Collapsible ─── */
details {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  margin-top: 10px;
  overflow: hidden;
  min-width: 0;
}

details > summary {
  padding: 12px 14px;
  cursor: pointer;
  font-weight: 600;
  user-select: none;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
}

details > summary::before {
  content: "\25B6";
  font-size: 0.65rem;
  transition: transform 0.2s;
  color: var(--muted);
}

details[open] > summary::before {
  transform: rotate(90deg);
}

details > summary::-webkit-details-marker {
  display: none;
}

details .details-content {
  padding: 0 14px 14px;
  overflow: hidden;
  min-width: 0;
}

.panel details {
  border-color: var(--line);
}

/* ─── Toast notification ─── */
.toast {
  position: fixed;
  bottom: 80px;
  right: 20px;
  background: var(--ink);
  color: #fff;
  padding: 12px 18px;
  border-radius: var(--radius-md);
  font-size: 0.84rem;
  font-weight: 500;
  z-index: 200;
  animation: toast-in 0.3s ease;
  max-width: 360px;
  box-shadow: var(--shadow-lg);
}

.toast.toast-error {
  background: var(--danger);
}

.toast.toast-success {
  background: #059669;
}

@keyframes toast-in {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes review-shimmer {
  from { transform: translateX(-100%); }
  to { transform: translateX(100%); }
}

/* ─── Void state ─── */
.void-dimmed {
  opacity: 0.35;
  pointer-events: none;
}

/* ─── Empty state ─── */
.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--muted);
}

.empty-state .empty-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
  display: block;
  opacity: 0.6;
}

.empty-state p {
  margin: 4px 0;
}

/* ─── Back link ─── */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.84rem;
  margin-bottom: 8px;
  font-weight: 500;
}

.back-link:hover {
  color: var(--primary);
}

.back-link::before {
  content: "\2190";
}

/* ─── Search input ─── */
.search-input {
  max-width: 320px;
  margin-bottom: 12px;
}

.table-helper {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 0.875rem;
}

.table-pagination {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 14px;
}

.table-pagination-status {
  color: var(--muted);
  font-size: 0.84rem;
  min-width: 90px;
  text-align: center;
}

.table-pagination button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
  transform: none;
}

/* ─── Quick actions in table ─── */
.quick-actions {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  align-items: center;
}

.quick-actions form {
  margin: 0;
}

.quick-actions a,
.quick-actions button {
  font-size: 0.78rem;
  padding: 4px 10px;
}

/* ─── Warn ─── */
.warn {
  color: var(--danger);
}

/* ─── Navigation arrows ─── */
.nav-arrows {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 16px;
  padding: 14px 0;
}

.nav-arrows a {
  color: var(--primary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.nav-arrows a:hover {
  background: var(--primary-light);
}

/* ─── Pass/fail donut ─── */
.donut-container {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 12px;
}

.donut-container canvas {
  max-width: 120px;
  max-height: 120px;
}

/* ─── Course UX ─── */
.empty-state-large {
  padding: 48px 20px;
}

.eyebrow {
  display: inline-block;
  margin-bottom: 10px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

.panel-hero {
  background:
    radial-gradient(ellipse at top left, rgba(26, 157, 143, 0.08), transparent 50%),
    radial-gradient(ellipse at bottom right, rgba(26, 109, 93, 0.04), transparent 50%),
    var(--panel);
  border: 1px solid rgba(26, 157, 143, 0.12);
}

.section-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.section-heading h1,
.section-heading h2,
.section-heading h3 {
  margin: 0;
}

.dashboard-hero h1,
.course-hero h1,
.auth-intro h1 {
  margin: 0 0 10px;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  line-height: 1.12;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.dashboard-hero p,
.course-hero p,
.auth-intro p {
  margin: 0;
  max-width: 720px;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

.dashboard-intro,
.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
}

.page-header-copy {
  min-width: 0;
}

.page-header-actions {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
  flex-shrink: 0;
}

.page-header-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.anchor-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink-secondary);
  text-decoration: none;
  font-size: 0.84rem;
  font-weight: 500;
  transition: all var(--transition);
}

.anchor-pill:hover {
  background: var(--primary-light);
  color: var(--primary);
  border-color: rgba(26, 109, 93, 0.2);
}

#create-course,
#course-exams,
#course-bank,
#course-roster,
#course-collaboration {
  scroll-margin-top: 96px;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.75fr) minmax(300px, 0.95fr);
  gap: 20px;
}

.dashboard-main,
.dashboard-side {
  min-width: 0;
}

.panel-note {
  margin: 0 0 14px;
}

.course-list {
  display: grid;
  gap: 12px;
}

.course-list-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  background: var(--panel);
  transition: all var(--transition);
}

.course-list-item:hover {
  border-color: rgba(26, 109, 93, 0.2);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.course-list-title {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 6px;
}

.course-list-item h3,
.invite-card h3 {
  margin: 0;
}

.course-list-item h3 a,
.table-link {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
}

.course-list-item h3 a:hover,
.table-link:hover {
  text-decoration: underline;
}

.course-list-copy p,
.invite-card p,
.muted-copy,
.auth-footnote {
  margin: 0;
  color: var(--muted);
  font-size: 0.875rem;
}

.course-list-actions {
  display: flex;
  align-items: center;
}

.stack-form {
  display: grid;
  gap: 10px;
}

.compact-stack {
  gap: 14px;
}

.feature-list {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
}

.feature-list li + li {
  margin-top: 8px;
}

.invite-list,
.member-list,
.compact-roster,
.pending-chip-list {
  display: grid;
  gap: 10px;
}

.invite-card,
.bank-preview-card {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--panel);
  transition: box-shadow var(--transition);
}

.invite-card:hover,
.bank-preview-card:hover {
  box-shadow: var(--shadow-sm);
}

.compact-roster-row,
.member-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line-light);
}

.compact-roster-row:last-child,
.member-row:last-child {
  border-bottom: none;
}

.compact-roster-row span,
.member-row span {
  color: var(--muted);
  font-size: 0.84rem;
}

.bank-preview-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

.bank-preview-card strong {
  display: block;
  margin-bottom: 8px;
  color: var(--primary);
}

.bank-preview-card p {
  margin: 0;
  color: var(--ink);
}

/* ─── Auth ─── */
.auth-shell {
  max-width: 1260px;
}

.auth-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(340px, 0.95fr);
  gap: 24px;
  align-items: stretch;
}

.auth-intro {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 48px 36px;
}

.auth-card {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.auth-tabs {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 6px;
  margin-bottom: 20px;
  background: var(--line-light);
  padding: 4px;
  border-radius: var(--radius-md);
}

.auth-tab {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  color: var(--muted);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.875rem;
  transition: all var(--transition);
}

.auth-tab:hover {
  color: var(--ink);
}

.auth-tab.is-active {
  background: var(--panel);
  color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.google-auth-button {
  width: 100%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 46px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--panel);
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.94rem;
  transition: all var(--transition);
}

.google-auth-button:hover {
  border-color: #b8c0d4;
  box-shadow: var(--shadow-sm);
}

.google-mark {
  width: 22px;
  height: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  color: #4285f4;
  font-weight: 800;
  font-family: Arial, sans-serif;
  background: #fff;
}

.auth-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 18px 0;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
}

.auth-divider::before,
.auth-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
}

.auth-form {
  margin-bottom: 14px;
}

.auth-points {
  list-style: none;
  padding: 0;
  margin: 24px 0 0;
  display: grid;
  gap: 10px;
}

.auth-points li {
  padding: 14px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--panel);
  font-size: 0.875rem;
  color: var(--ink-secondary);
  position: relative;
  padding-left: 40px;
}

.auth-points li::before {
  content: "\2713";
  position: absolute;
  left: 14px;
  top: 14px;
  color: var(--accent);
  font-weight: 700;
}

/* ─── Panel sidebar ─── */
.panel-sidebar {
  background: var(--panel);
}

/* ─── Responsive ─── */
@media (max-width: 900px) {
  .dashboard-grid,
  .auth-layout {
    grid-template-columns: 1fr;
  }

  .analytics-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .review-assistant-hero,
  .review-meta-grid,
  .review-summary-grid {
    grid-template-columns: 1fr;
  }

  .row {
    flex-direction: column;
    align-items: stretch;
  }

  .images-row {
    grid-template-columns: 1fr;
  }

  .table-pagination {
    justify-content: space-between;
  }

  .stat-cards {
    grid-template-columns: repeat(2, 1fr);
  }

  .sticky-bar {
    flex-wrap: wrap;
  }

  .manual-assignment-banner {
    flex-direction: column;
    align-items: stretch;
  }

  .dashboard-intro,
  .page-header {
    flex-direction: column;
    align-items: stretch;
  }

  .course-list-item {
    grid-template-columns: 1fr;
  }

  .page-header-actions {
    align-items: flex-start;
  }

  .auth-intro {
    padding: 32px 24px;
  }
}

@media (max-width: 500px) {
  .analytics-grid {
    grid-template-columns: 1fr;
  }

  .review-card-header,
  .review-summary-header {
    flex-direction: column;
    align-items: stretch;
  }

  .analytics-item-header {
    flex-direction: column;
  }

  .analytics-question-chip {
    align-self: flex-start;
  }

  .analytics-question-tooltip {
    left: 0;
    width: min(320px, calc(100vw - 64px));
    transform: translateY(-4px);
  }

  .analytics-question-chip:hover .analytics-question-tooltip,
  .analytics-question-chip:focus-visible .analytics-question-tooltip {
    transform: translateY(0);
  }

  .stat-cards {
    grid-template-columns: 1fr;
  }

  .topbar-inner {
    flex-direction: column;
    gap: 8px;
  }

  .container {
    padding: 16px 12px 100px;
  }
}