:root {
  --bg: #0b0f19;
  --card: #111827;
  --muted: #9ca3af;
  --text: #e5e7eb;
  --line: #263043;
  --brand: #60a5fa;
  --brand2: #34d399;
  --danger: #fb7185;
  --warn: #fbbf24;
  --shadow: 0 20px 50px rgba(0, 0, 0, .35);
  --radius: 18px;
}

* {
  box-sizing: border-box
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: radial-gradient(1200px 600px at 20% 0%, rgba(96, 165, 250, .18), transparent 60%),
    radial-gradient(900px 500px at 90% 20%, rgba(52, 211, 153, .14), transparent 55%),
    var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.skip {
  position: absolute;
  left: -999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.skip:focus {
  left: 16px;
  top: 16px;
  width: auto;
  height: auto;
  padding: 10px 12px;
  background: #000;
  color: #fff;
  border-radius: 10px;
  z-index: 99;
}

.app {
  width: min(920px, 92vw);
  margin: 40px auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.header .badge {
  display: inline-block;
  padding: 6px 10px;
  border: 1px solid rgba(96, 165, 250, .35);
  color: #cfe6ff;
  background: rgba(96, 165, 250, .12);
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: .3px;
  margin-bottom: 10px;
}

.header h1 {
  margin: 0;
  font-size: 32px;
}

.subhead {
  margin: 10px 0 0;
  color: var(--muted);
  line-height: 1.4;
}

.card {
  background: linear-gradient(180deg, rgba(255, 255, 255, .03), rgba(255, 255, 255, .01));
  border: 1px solid rgba(255, 255, 255, .06);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
}

.statusRow {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.modePill {
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, .12);
  background: rgba(255, 255, 255, .04);
  font-size: 12px;
  color: #dbeafe;
}

.stepMeta {
  color: var(--muted);
  font-size: 13px;
}

.progressWrap {
  margin-top: 12px;
}

.progressBar {
  width: 100%;
  height: 10px;
  background: rgba(255, 255, 255, .06);
  border-radius: 999px;
  overflow: hidden;
}

.progressFill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--brand), var(--brand2));
  border-radius: 999px;
}

.divider {
  height: 1px;
  background: rgba(255, 255, 255, .06);
  margin: 14px 0;
}

.content {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.stepTitle {
  font-size: 22px;
  margin: 0;
}

.stepBody {
  color: var(--text);
  line-height: 1.55;
  margin: 0;
}

.stepImageBox {
  width: 100%;
  margin: 12px 0;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(0, 0, 0, 0.2);
}

.stepImage {
  width: 100%;
  height: auto;
  display: block;
  object-fit: contain;
  max-height: 400px;
}

.callout {
  border: 1px solid rgba(255, 255, 255, .09);
  background: rgba(255, 255, 255, .03);
  border-radius: 14px;
  padding: 12px;
}

.callout strong {
  color: #e0f2fe;
}

.kicker {
  color: var(--muted);
  font-size: 13px;
  margin: 0;
}

.quizGrid {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 14px;
}

@media (max-width: 860px) {
  .quizGrid {
    grid-template-columns: 1fr;
  }
}

.list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, .10);
  background: rgba(255, 255, 255, .03);
}

.item[draggable="true"] {
  cursor: grab;
}

.item.dragging {
  opacity: .55;
  transform: scale(.99);
}

.handle {
  width: 28px;
  height: 28px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  background: rgba(255, 255, 255, .06);
  border: 1px solid rgba(255, 255, 255, .08);
  color: #dbeafe;
  flex: 0 0 auto;
}

.itemMain {
  flex: 1;
}

.itemMain p {
  margin: 0;
  line-height: 1.4;
}

.itemBtns {
  display: flex;
  gap: 8px;
  flex: 0 0 auto;
}

.smallBtn {
  padding: 8px 10px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, .10);
  background: rgba(255, 255, 255, .03);
  color: var(--text);
  cursor: pointer;
}

.smallBtn:disabled {
  opacity: .45;
  cursor: not-allowed;
}

.panel {
  border: 1px solid rgba(255, 255, 255, .10);
  background: rgba(255, 255, 255, .02);
  border-radius: 14px;
  padding: 12px;
}

.panel h3 {
  margin: 0 0 8px;
  font-size: 16px;
}

.panel p {
  margin: 0;
  color: var(--muted);
  line-height: 1.45;
}

.feedback {
  margin-top: 10px;
  border-radius: 14px;
  padding: 12px;
  border: 1px solid rgba(255, 255, 255, .12);
}

.feedback.good {
  border-color: rgba(52, 211, 153, .35);
  background: rgba(52, 211, 153, .10);
}

.feedback.bad {
  border-color: rgba(251, 113, 133, .35);
  background: rgba(251, 113, 133, .10);
}

.feedback .title {
  font-weight: 700;
  margin: 0 0 6px;
}

.feedback ul {
  margin: 8px 0 0 18px;
  color: var(--text);
}

.feedback li {
  margin: 4px 0;
}

.controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.controlsRight {
  display: flex;
  gap: 10px;
  align-items: center;
}

.btn {
  padding: 10px 14px;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, .12);
  background: rgba(255, 255, 255, .03);
  color: var(--text);
  cursor: pointer;
  font-weight: 600;
}

.btn:disabled {
  opacity: .45;
  cursor: not-allowed;
}

.btn.primary {
  border-color: rgba(96, 165, 250, .35);
  background: rgba(96, 165, 250, .18);
}

.btn.primary:hover {
  background: rgba(96, 165, 250, .26);
}

.btn.ghost:hover {
  background: rgba(255, 255, 255, .06);
}

.helper {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 13px;
  min-height: 18px;
}

.footer .fineprint {
  margin: 0;
  color: rgba(255, 255, 255, .45);
  font-size: 12px;
}