:root {
  --bg: #0b0f14;
  --card: #121821;
  --panel: #0f141c;
  --surface-2: #111720;
  --border: rgba(255, 255, 255, 0.08);
  --text: #f5f7fb;
  --muted: #a3acb9;
  --accent: #ffb11a;
  --accent-2: #ffd27a;
  --danger: #ef5a5a;
  --success: #19c37d;
  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 16px;
  --sh-sm: 0 6px 18px rgba(0, 0, 0, 0.28);
  --sh-md: 0 10px 30px rgba(0, 0, 0, 0.35);
  --focus: rgba(255, 177, 26, 0.3);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Space Grotesk", system-ui, -apple-system, sans-serif;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: linear-gradient(
      rgba(255, 255, 255, 0.08) 1px,
      transparent 1px
    ),
    linear-gradient(90deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.18;
  pointer-events: none;
}

.page {
  position: relative;
  max-width: 1120px;
  margin: 0 auto;
  padding: 32px 20px 60px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 18px;
  box-shadow: var(--sh-sm);
}

.collapsible.card {
  padding: 0;
  overflow: hidden;
}

.collapsible summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px;
}

.collapsible summary::-webkit-details-marker {
  display: none;
}

.collapsible summary::marker {
  content: "";
}

.summary-head h2 {
  margin: 0 0 6px;
}

.summary-head .muted {
  margin: 0;
}

.collapsible[open] summary {
  border-bottom: 1px solid var(--border);
}

.collapsible-body {
  padding: 0 18px 18px;
}

.chev {
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  transform: rotate(-45deg);
  transition: transform 0.2s ease;
}

.collapsible[open] .chev {
  transform: rotate(45deg);
}

.hero {
  display: grid;
  grid-template-columns: 1fr 240px;
  gap: 24px;
  align-items: center;
}

.hero h1 {
  margin: 4px 0 8px;
  font-size: 28px;
  font-weight: 600;
}

.kicker {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 12px;
  color: var(--accent-2);
  margin: 0;
}

.muted {
  color: var(--muted);
  margin: 6px 0 0;
}

.stat {
  background: var(--panel);
  border-radius: var(--r-md);
  border: 1px solid var(--border);
  padding: 16px;
  text-align: right;
}

.stat-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.stat-value {
  font-size: 18px;
  font-weight: 600;
  margin-top: 6px;
}

.stat-sub {
  font-size: 12px;
  color: var(--accent-2);
  margin-top: 6px;
}

.mono {
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 14px;
}

.item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: var(--r-md);
  background: var(--panel);
  border: 1px solid var(--border);
}

.item-title {
  font-weight: 600;
}

.item-sub {
  font-size: 12px;
  color: var(--muted);
}

.btn {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  padding: 8px 14px;
  border-radius: var(--r-sm);
  cursor: pointer;
  font-weight: 600;
}

.btn.primary {
  background: var(--accent);
  color: #121212;
  border-color: transparent;
}

.btn.ghost:hover {
  border-color: var(--accent-2);
}

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

.row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
}

.actions {
  gap: 10px;
}

.filters {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.field-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
}

select {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 6px 10px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--panel);
  border-radius: 999px;
  border: 1px solid var(--border);
  padding: 5px 10px;
  font-size: 11px;
  color: var(--muted);
}

.chip-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip-select {
  gap: 8px;
  padding: 6px 10px;
  border-radius: 12px;
  transition: border-color 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.chip-select.is-checked {
  border-color: rgba(255, 177, 26, 0.5);
  background: rgba(255, 177, 26, 0.08);
  color: var(--text);
}

.chip-select input {
  appearance: none;
  width: 14px;
  height: 14px;
  margin: 0;
  border: 1px solid var(--border);
  background: #0d121a;
  display: grid;
  place-items: center;
}

.chip-select input[type="checkbox"] {
  border-radius: 4px;
}

.chip-select input[type="checkbox"]::after {
  content: "";
  width: 4px;
  height: 8px;
  border-right: 2px solid #121212;
  border-bottom: 2px solid #121212;
  transform: rotate(45deg);
  opacity: 0;
}

.chip-select input[type="checkbox"]:checked {
  background: var(--accent);
  border-color: var(--accent);
}

.chip-select input[type="checkbox"]:checked::after {
  opacity: 1;
}

.chip-select input[type="radio"] {
  border-radius: 999px;
}

.chip-select input[type="radio"]::after {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #121212;
  opacity: 0;
}

.chip-select input[type="radio"]:checked {
  background: var(--accent);
  border-color: var(--accent);
}

.chip-select input[type="radio"]:checked::after {
  opacity: 1;
}

.mode-field {
  min-width: 200px;
}

.mode-toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 10px;
}

.mode-pill {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 22px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  inset: 0;
  background: #0d121a;
  border: 1px solid var(--border);
  border-radius: 999px;
  transition: 0.2s ease;
}

.slider::before {
  content: "";
  position: absolute;
  height: 16px;
  width: 16px;
  left: 2px;
  top: 2px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 3px 8px rgba(0, 0, 0, 0.35);
  transition: transform 0.2s ease;
}

.switch input:checked + .slider::before {
  transform: translateX(20px);
}

.quiz {
  margin-top: 18px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.quiz-card {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 14px;
}

.quiz-card.correct {
  border-color: rgba(25, 195, 125, 0.5);
  box-shadow: 0 0 0 1px rgba(25, 195, 125, 0.2);
}

.quiz-card.incorrect {
  border-color: rgba(239, 90, 90, 0.6);
  box-shadow: 0 0 0 1px rgba(239, 90, 90, 0.2);
}

.quiz-card.pending {
  border-color: rgba(255, 177, 26, 0.45);
  box-shadow: 0 0 0 1px rgba(255, 177, 26, 0.18);
}

.quiz-card h3 {
  margin: 0 0 8px;
}

.options {
  display: grid;
  gap: 8px;
}

.option-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: var(--r-sm);
  border: 1px solid transparent;
  background: rgba(255, 255, 255, 0.02);
}

.option-letter {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 2px 8px;
  font-size: 12px;
}

.option-text {
  color: var(--text);
}

.option-row.correct-option {
  border-color: rgba(25, 195, 125, 0.5);
  background: rgba(25, 195, 125, 0.08);
}

.option-row.wrong-option {
  border-color: rgba(239, 90, 90, 0.6);
  background: rgba(239, 90, 90, 0.08);
}

.result {
  margin-top: 16px;
  padding: 12px 14px;
  background: var(--panel);
  border-radius: var(--r-md);
  border: 1px solid var(--border);
  min-height: 48px;
}

.answer-line {
  margin-top: 12px;
  padding: 10px 12px;
  border-radius: var(--r-sm);
  background: rgba(255, 177, 26, 0.12);
  border: 1px solid rgba(255, 177, 26, 0.4);
  font-size: 13px;
}

.answer-line.neutral {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--border);
  color: var(--muted);
}

.detail-block {
  margin-top: 10px;
  border-radius: var(--r-sm);
  border: 1px solid var(--border);
  background: var(--panel);
  padding: 8px 10px;
}

.detail-block summary {
  cursor: pointer;
  color: var(--accent-2);
  font-weight: 600;
}

.detail-body {
  margin-top: 8px;
  color: var(--muted);
  font-size: 13px;
}

.open-response {
  width: 100%;
  min-height: 120px;
  border-radius: var(--r-sm);
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  padding: 10px 12px;
  resize: vertical;
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

.diagnostics {
  display: grid;
  gap: 12px;
  margin-top: 12px;
}

.diag-card {
  padding: 12px 14px;
  border-radius: var(--r-md);
  border: 1px solid var(--border);
  background: var(--panel);
}

.diag-title {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.diag-body {
  margin-top: 8px;
  font-size: 14px;
}

.diag-list {
  margin: 10px 0 0;
  padding-left: 18px;
  font-size: 14px;
}

.diag-list li {
  margin: 6px 0;
  color: var(--text);
}

@media (max-width: 800px) {
  .hero {
    grid-template-columns: 1fr;
  }
}