:root {
  --bg: #f4f6f8;
  --surface: #ffffff;
  --ink: #1f2933;
  --muted: #62748a;
  --line: #d9e2ec;
  --brand: #0b5fff;
  --brand-dark: #0847c7;
  --teal: #17a2b8;
  --header-blue: #1a73e8;
  --ok: #0f9d58;
  --ok-bg: #e8f8ef;
  --bad: #d93025;
  --bad-bg: #fdecea;
  --soft: #eef4ff;
  --shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
  --radius: 10px;
  --font: "Segoe UI", system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  line-height: 1.5;
}

a { color: var(--brand); text-decoration: none; }
button, select { font: inherit; }

.container {
  width: min(1100px, calc(100% - 2rem));
  margin: 0 auto;
}

.topbar {
  background: #111827;
  color: #fff;
  border-bottom: 4px solid var(--brand);
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 64px;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.user-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 999px;
  padding: 0.35rem 0.8rem;
  color: #e2e8f0;
  font-size: 0.9rem;
}

.user-chip-copy {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
  min-width: 0;
}

.user-chip #userChipName {
  font-weight: 700;
  color: #fff;
}

.user-chip #userChipEmail {
  font-size: 0.72rem;
  font-weight: 500;
  color: #94a3b8;
  max-width: 220px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: #fff;
  font-weight: 700;
}

.brand-logo {
  width: 36px;
  height: 36px;
  border-radius: 9px;
  display: block;
  flex-shrink: 0;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.08);
}

.brand-text {
  font-size: 1.15rem;
  letter-spacing: 0.06em;
}

.brand-mark {
  background: linear-gradient(135deg, #38bdf8, #2563eb);
  color: #fff;
  border-radius: 8px;
  padding: 0.35rem 0.55rem;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
}

.login-logo {
  display: block;
  width: min(340px, 100%);
  height: auto;
  margin: 0 auto 1.25rem;
  border-radius: 14px;
  background: #0b1220;
  object-fit: cover;
  aspect-ratio: 16 / 7;
  object-position: center;
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.12);
}

.top-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: #cbd5e1;
  font-size: 0.95rem;
  flex-wrap: wrap;
}

#navExamLabel {
  color: #e2e8f0;
  font-weight: 600;
}

[hidden] {
  display: none !important;
}

.link-btn {
  background: none;
  border: 0;
  color: #93c5fd;
  cursor: pointer;
  padding: 0;
}

.link-btn:hover { text-decoration: underline; }
.nav-sep { opacity: 0.5; }

.view { padding: 1.5rem 0 3rem; }

.hero-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.75rem;
  text-align: center;
  margin-bottom: 1.5rem;
}

.hero-card h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.4rem, 2vw, 1.9rem);
}

.hero-sub {
  margin: 0 auto 1rem;
  max-width: 42rem;
  color: var(--muted);
}

.hero-stats {
  display: inline-flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
  color: var(--brand-dark);
  font-weight: 600;
}

.login-card {
  max-width: 460px;
  margin: 2rem auto;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem 1.75rem;
  text-align: center;
}

.login-card h1 {
  margin: 0 0 0.5rem;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  width: 100%;
  text-align: left;
  margin-top: 1.25rem;
}

.login-fields {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  width: 100%;
}

.login-fields[hidden],
.login-form [hidden] {
  display: none !important;
}

.login-field {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0.4rem;
  width: 100%;
}

.login-form label {
  display: block;
  width: 100%;
  font-weight: 600;
  color: var(--ink);
}

.login-form input {
  display: block;
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.75rem 0.9rem;
  font: inherit;
}

.field-hint {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.4;
}

.login-form input:focus {
  outline: 2px solid #93c5fd;
  border-color: var(--brand);
}

.login-code-copy {
  margin: 0 0 0.35rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.login-code-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  margin-top: 0.25rem;
}

.login-status {
  margin: 0.25rem 0 0;
  font-size: 0.92rem;
}

.login-status.ok {
  color: var(--ok);
}

.login-status.bad {
  color: var(--bad);
}

.btn-wide {
  width: 100%;
  margin-top: 0.35rem;
}

.saved-users {
  margin-top: 1.5rem;
  text-align: left;
  border-top: 1px solid var(--line);
  padding-top: 1rem;
}

.saved-users h3 {
  margin: 0 0 0.65rem;
  font-size: 0.95rem;
  color: var(--muted);
}

.saved-user-list {
  display: grid;
  gap: 0.5rem;
}

.saved-user-btn {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  align-items: center;
  width: 100%;
  border: 1px solid var(--line);
  background: #f8fafc;
  border-radius: 8px;
  padding: 0.75rem 0.9rem;
  cursor: pointer;
  text-align: left;
}

.saved-user-btn:hover {
  border-color: var(--brand);
  background: var(--soft);
}

.saved-user-btn strong {
  display: block;
}

.saved-user-btn span {
  color: var(--muted);
  font-size: 0.85rem;
}

.continue-card,
.user-stats-card,
.admin-usage-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.1rem 1.25rem;
  margin-bottom: 1.25rem;
}

.continue-card {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
  border-left: 4px solid var(--brand);
}

.continue-card h2,
.user-stats-card h2,
.admin-usage-card h2 {
  margin: 0 0 0.25rem;
  font-size: 1.1rem;
}

.continue-card p,
.user-stats-card p,
.admin-usage-card p {
  margin: 0;
  color: var(--muted);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 0.75rem;
  margin-top: 0.9rem;
}

.stat-tile {
  background: #f8fafc;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.75rem;
  text-align: center;
}

.stat-tile strong {
  display: block;
  font-size: 1.35rem;
  color: var(--brand-dark);
}

.stat-tile.ok strong { color: var(--ok); }
.stat-tile.bad strong { color: var(--bad); }

.stat-tile span {
  color: var(--muted);
  font-size: 0.85rem;
}

.admin-usage-card {
  border-left: 4px solid #0f766e;
}

.admin-table-wrap {
  margin-top: 1rem;
  overflow-x: auto;
}

.admin-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  text-align: left;
}

.admin-table th,
.admin-table td {
  padding: 0.55rem 0.65rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.admin-table th {
  color: var(--muted);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.admin-table td.ok { color: var(--ok); font-weight: 700; }
.admin-table td.bad { color: var(--bad); font-weight: 700; }

.admin-now {
  display: inline-block;
  margin-left: 0.35rem;
  padding: 0.05rem 0.4rem;
  border-radius: 999px;
  background: #dcfce7;
  color: #166534;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
}

.set-card .set-progress {
  margin-top: 0.35rem;
  font-size: 0.85rem;
}

.set-card .set-progress .ok { color: var(--ok); font-weight: 700; }
.set-card .set-progress .bad { color: var(--bad); font-weight: 700; }
.set-card.in-progress {
  border-color: #90b4ff;
  background: #f5f9ff;
}

.toolbar-left {
  display: flex;
  gap: 0.85rem;
  flex-wrap: wrap;
  align-items: center;
}

.score-box .score-ok span { color: var(--ok); }
.score-box .score-bad span { color: var(--bad); }

.q-status {
  margin-left: 0.5rem;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.12rem 0.45rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.2);
}

.q-status.passed { background: rgba(15, 157, 88, 0.95); }
.q-status.failed { background: rgba(217, 48, 37, 0.95); }

.empty-filter {
  background: var(--surface);
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  color: var(--muted);
}

.collections {
  display: grid;
  gap: 1.25rem;
}

.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}

.course-section {
  margin-bottom: 1.5rem;
}

.course-section-header {
  margin: 0 0 0.85rem;
  padding-bottom: 0.55rem;
  border-bottom: 2px solid var(--line);
}

.course-section-header h3 {
  margin: 0 0 0.2rem;
  font-size: 1.15rem;
  color: var(--brand-dark);
}

.course-section-header p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.course-section-grid {
  margin: 0;
}

#certCourses:has(.course-section) {
  display: block;
}

.cert-card {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  text-align: left;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.15rem 1.2rem;
  cursor: pointer;
  transition: border-color 0.15s, transform 0.15s, box-shadow 0.15s;
}

.cert-card:hover {
  border-color: var(--brand);
  box-shadow: 0 8px 20px rgba(11, 95, 255, 0.12);
  transform: translateY(-2px);
}

.cert-card .cert-vendor {
  color: var(--teal);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.cert-card strong {
  font-size: 1.25rem;
  color: var(--ink);
}

.cert-card .cert-sub {
  color: var(--muted);
  font-size: 0.92rem;
  min-height: 2.6em;
}

.cert-card .cert-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 0.35rem;
  color: var(--brand-dark);
  font-weight: 600;
  font-size: 0.9rem;
}

.cert-card .cert-progress {
  color: var(--muted);
  font-size: 0.85rem;
}

.cert-card .cert-progress .ok { color: var(--ok); font-weight: 700; }
.cert-card .cert-progress .bad { color: var(--bad); font-weight: 700; }

.collection-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.collection-head {
  background: linear-gradient(90deg, var(--teal), #0e7490);
  color: #fff;
  padding: 1rem 1.25rem;
}

.collection-head h2 {
  margin: 0 0 0.25rem;
  font-size: 1.2rem;
}

.collection-head p {
  margin: 0;
  opacity: 0.95;
  font-size: 0.95rem;
}

.set-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.85rem;
  padding: 1.1rem;
}

.course-set-grid {
  padding: 0;
}

.set-card {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1rem;
  background: #fbfdff;
  cursor: pointer;
  text-align: left;
  transition: border-color 0.15s, transform 0.15s, box-shadow 0.15s;
}

.set-card:hover {
  border-color: var(--brand);
  box-shadow: 0 6px 16px rgba(11, 95, 255, 0.12);
  transform: translateY(-1px);
}

.set-card strong {
  color: var(--ink);
  font-size: 1.05rem;
}

.set-card span {
  color: var(--muted);
  font-size: 0.9rem;
}

.exam-header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: stretch;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.eyebrow {
  margin: 0 0 0.25rem;
  color: var(--teal);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-size: 0.8rem;
}

#examTitle {
  margin: 0 0 0.35rem;
  font-size: 1.5rem;
}

.exam-meta {
  margin: 0;
  color: var(--muted);
}

.score-box {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(4.5rem, auto));
  gap: 0.85rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.9rem 1rem;
  align-content: center;
  min-width: 300px;
}

.score-box span {
  font-weight: 700;
  color: var(--brand-dark);
}

.toolbar {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.page-size {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--muted);
}

.page-size select {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.35rem 0.5rem;
  background: #fff;
}

.toolbar-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.btn {
  border: 0;
  border-radius: 6px;
  padding: 0.55rem 0.9rem;
  cursor: pointer;
  font-weight: 600;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--header-blue);
  color: #fff;
}

.btn-primary:hover:not(:disabled) {
  background: var(--brand-dark);
}

.btn-ghost {
  background: #fff;
  border: 1px solid var(--line);
  color: var(--ink);
}

.btn-ghost:hover {
  background: #f8fafc;
}

.question-list {
  display: grid;
  gap: 1rem;
}

.q-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.q-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.65rem;
  background: var(--header-blue);
  color: #fff;
  padding: 0.7rem 1rem;
  font-weight: 700;
  flex-wrap: wrap;
}

.q-topic {
  background: rgba(255, 255, 255, 0.18);
  border-radius: 999px;
  padding: 0.2rem 0.65rem;
  font-size: 0.8rem;
  font-weight: 600;
}

.q-body {
  padding: 1rem 1.1rem 1.15rem;
}

.q-kicker {
  margin: 0 0 0.4rem;
  font-size: 0.78rem;
  line-height: 1.35;
  color: var(--muted);
  font-weight: 500;
}

.q-stem {
  margin: 0 0 0.9rem;
  white-space: pre-wrap;
}

.options {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.45rem;
}

.option {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.7rem 0.8rem;
  cursor: pointer;
  background: #fff;
  transition: background 0.15s, border-color 0.15s;
}

.option:hover:not(.locked) {
  background: var(--soft);
}

.option.selected {
  background: #e8f1ff;
  border-color: #90b4ff;
}

.option.correct {
  background: var(--ok-bg);
  border-color: #7dd3a5;
}

.option.incorrect {
  background: var(--bad-bg);
  border-color: #f5a8a2;
}

.option.locked {
  cursor: default;
}

.choice-box {
  width: 22px;
  height: 22px;
  flex: 0 0 22px;
  margin-top: 1px;
  border: 2px solid #486581;
  background: #fff;
  display: grid;
  place-items: center;
  box-sizing: border-box;
}

.option-multi .choice-box {
  border-radius: 4px;
}

.option-single .choice-box {
  border-radius: 50%;
}

.option-multi.selected .choice-box {
  background: var(--brand);
  border-color: var(--brand);
}

.option-multi.selected .choice-box::after {
  content: "";
  width: 11px;
  height: 6px;
  border: 2.5px solid #fff;
  border-top: 0;
  border-right: 0;
  transform: rotate(-45deg) translate(0, -1px);
}

.option-single.selected .choice-box::after {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--brand);
}

.option.correct .choice-box {
  border-color: var(--ok);
}

.option-multi.correct .choice-box {
  background: var(--ok);
  border-color: var(--ok);
}

.q-instruction {
  margin: -0.35rem 0 0.95rem;
  padding: 0.55rem 0.75rem;
  background: #eef4ff;
  border-left: 4px solid var(--brand);
  border-radius: 6px;
  color: #163a7a;
  font-size: 0.92rem;
  font-weight: 600;
}

.option-letter {
  font-weight: 700;
  min-width: 1.2rem;
}

.option-text { flex: 1; }

.pair-col-title {
  margin: 0 0 0.35rem;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

.drop-slot.drag-over {
  border-color: var(--brand);
  background: #e8f1ff;
  box-shadow: inset 0 0 0 2px rgba(11, 95, 255, 0.18);
}

.drag-chip {
  display: flex;
  gap: 0.55rem;
  align-items: flex-start;
  background: #e8f1ff;
  border: 1px solid #90b4ff;
  border-radius: 8px;
  padding: 0.55rem 0.65rem;
  cursor: grab;
  user-select: none;
  touch-action: none;
}

.drag-grip {
  width: 10px;
  height: 16px;
  margin-top: 3px;
  flex: 0 0 10px;
  background-image: radial-gradient(#5b7ea6 1.4px, transparent 1.5px);
  background-size: 5px 5px;
  opacity: 0.85;
}

.drag-chip-body { flex: 1; }

.drag-chip.picking {
  outline: 2px solid var(--brand);
  box-shadow: 0 0 0 3px rgba(11, 95, 255, 0.18);
}

.drag-chip.dragging {
  opacity: 0.35;
}

.drag-chip.locked {
  cursor: default;
}

.drag-chip.chip-ok {
  background: var(--ok-bg);
  border-color: #7dd3a5;
}

.drag-chip.chip-bad {
  background: var(--bad-bg);
  border-color: #f5a8a2;
}

.drag-ghost {
  position: fixed;
  left: 0;
  top: 0;
  z-index: 9999;
  width: min(360px, 80vw);
  pointer-events: none;
  background: #fff;
  border: 1px solid var(--brand);
  border-radius: 8px;
  padding: 0.55rem 0.7rem;
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.18);
}

body.is-dragging,
body.is-dragging * {
  cursor: grabbing !important;
  user-select: none !important;
}

.option-text { flex: 1; }

.q-visual {
  display: grid;
  gap: 0.75rem;
  margin: 0 0 1rem;
}

.q-figure {
  margin: 0;
  background: #f8fafc;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.75rem;
  overflow: auto;
}

.q-figure img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 0 auto;
}

.case-panel {
  background: #f8fafc;
  border: 1px solid var(--line);
  border-left: 4px solid var(--brand);
  border-radius: 8px;
  padding: 0.85rem 1rem;
  margin: 0 0 1rem;
}

.case-kicker {
  margin: 0 0 0.4rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--brand-dark);
}

.case-text {
  margin: 0;
  color: var(--ink);
}

.pair-board {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(220px, 0.9fr);
  gap: 1rem;
  align-items: start;
}

.pair-slots,
.pair-pool {
  display: grid;
  gap: 0.55rem;
}

.pair-pool {
  background: #f8fafc;
  border: 1px dashed var(--line);
  border-radius: 8px;
  padding: 0.75rem;
}

.pair-pool-label {
  margin: 0;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--muted);
}

.pair-pool-items {
  display: grid;
  gap: 0.45rem;
}

.match-row {
  display: grid;
  grid-template-columns: minmax(120px, 0.9fr) minmax(0, 1.2fr);
  gap: 0.5rem;
  align-items: stretch;
}

.match-key {
  display: flex;
  gap: 0.4rem;
  align-items: flex-start;
  font-weight: 650;
  padding: 0.55rem 0.2rem;
}

.drop-slot {
  min-height: 56px;
  border: 2px dashed #b8c7dc;
  border-radius: 8px;
  background: #fbfdff;
  padding: 0.3rem;
}

.drop-slot.locked {
  border-style: solid;
}

.drop-placeholder {
  display: flex;
  align-items: center;
  color: var(--muted);
  font-size: 0.85rem;
  padding: 0.55rem 0.6rem;
  min-height: 48px;
}

@media (max-width: 800px) {
  .pair-board,
  .match-row {
    grid-template-columns: 1fr;
  }
}

.badge {
  display: inline-block;
  margin-left: 0.4rem;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.1rem 0.4rem;
  border-radius: 999px;
  vertical-align: middle;
}

.badge-ok {
  background: var(--ok);
  color: #fff;
}

.badge-bad {
  background: var(--bad);
  color: #fff;
}

.q-actions {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.hint {
  margin: 0.65rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.answer-panel {
  margin-top: 1rem;
  border: 1px solid #c7d7fe;
  background: #f8fbff;
  border-radius: 8px;
  padding: 0.9rem 1rem;
}

.answer-panel.hidden { display: none; }

.answer-line {
  margin: 0 0 0.55rem;
  font-weight: 700;
}

.answer-line .correct-letter {
  color: var(--ok);
}

.result-pill {
  display: inline-block;
  margin-left: 0.5rem;
  padding: 0.1rem 0.5rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
}

.result-pill.ok {
  background: var(--ok-bg);
  color: var(--ok);
}

.result-pill.bad {
  background: var(--bad-bg);
  color: var(--bad);
}

.explanation {
  margin: 0;
  color: #334155;
  white-space: pre-wrap;
}

.explanation strong {
  color: var(--ink);
}

.why-explanation {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  white-space: normal;
}

.why-item {
  margin: 0;
  padding: 0.75rem 0.9rem;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #f8fafc;
}

.why-item h4 {
  margin: 0 0 0.35rem;
  font-size: 0.92rem;
}

.why-item p {
  margin: 0;
  white-space: pre-wrap;
}

.why-item.correct {
  background: var(--ok-bg);
  border-color: #b7e4c7;
}

.why-item.correct h4 {
  color: var(--ok);
}

.why-item.incorrect {
  background: var(--bad-bg);
  border-color: #f5c2c0;
}

.why-item.incorrect h4 {
  color: var(--bad);
}

.why-alignment {
  margin: 0.15rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
  white-space: pre-wrap;
}

.meta-line {
  margin: 0.65rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.pager {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-top: 1.5rem;
}

.page-btn {
  min-width: 2.4rem;
  height: 2.4rem;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 600;
}

.page-btn:hover:not(:disabled) {
  border-color: var(--brand);
  color: var(--brand);
}

.page-btn.active {
  background: var(--header-blue);
  border-color: var(--header-blue);
  color: #fff;
}

.page-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.error-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
}

.code-block {
  background: #0f172a;
  color: #e2e8f0;
  border-radius: 8px;
  padding: 1rem;
  overflow-x: auto;
}

.footer {
  border-top: 1px solid var(--line);
  padding: 1.25rem 0 2rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.loading {
  padding: 2rem;
  text-align: center;
  color: var(--muted);
}

@media (max-width: 640px) {
  .score-box {
    width: 100%;
    grid-template-columns: repeat(2, 1fr);
    text-align: center;
    font-size: 0.9rem;
  }

  .continue-card {
    align-items: stretch;
  }

  .q-head {
    flex-direction: column;
    align-items: flex-start;
  }
}