:root {
  --bg: #0a0d18;
  --bg-soft: #11141f;
  --surface: rgba(255, 255, 255, 0.04);
  --surface-2: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.16);
  --text: #f5f6fa;
  --muted: #8b91a7;
  --dim: #5a607a;
  --accent: #f4c35b;
  --accent-soft: rgba(244, 195, 91, 0.12);
  --good: #4ade80;
  --bad: #f87171;
  --info: #60a5fa;
  --radius: 8px;
  --radius-sm: 8px;
  --shadow-1: 0 1px 0 rgba(255, 255, 255, 0.04) inset, 0 10px 30px rgba(0, 0, 0, 0.35);
  --shadow-2: 0 1px 0 rgba(255, 255, 255, 0.05) inset, 0 18px 60px rgba(0, 0, 0, 0.45);
  --shell-max: 1180px;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  color-scheme: dark;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  font-feature-settings: "cv11", "ss01", "ss03";
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  min-height: 100%;
}

body {
  min-height: 100vh;
  overflow-x: hidden;
  background:
    radial-gradient(1200px 700px at 80% -10%, rgba(244, 195, 91, 0.06), transparent 60%),
    radial-gradient(900px 600px at -10% 10%, rgba(96, 165, 250, 0.06), transparent 60%),
    var(--bg);
  letter-spacing: 0;
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

button {
  border: 0;
  background: none;
  cursor: pointer;
}

a {
  color: inherit;
  text-decoration: none;
}

[hidden] {
  display: none !important;
}

#fx-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}

/* ──── Topbar ──── */
.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px clamp(16px, 4vw, 32px);
  background: rgba(10, 13, 24, 0.72);
  backdrop-filter: saturate(140%) blur(16px);
  border-bottom: 1px solid var(--border);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: 0;
  font-size: 0.98rem;
}

.brand:hover {
  color: var(--accent);
}

.topbar-nav {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.back-button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border-radius: 999px;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 0.85rem;
  font-weight: 500;
  transition: background 160ms var(--ease), border-color 160ms var(--ease), transform 160ms var(--ease);
}

.back-button:hover {
  background: var(--surface-2);
  border-color: var(--border-strong);
}

.back-button:active { transform: translateY(1px); }

.ghost-link {
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 0.85rem;
  color: var(--muted);
  font-weight: 500;
}

.ghost-link:hover { color: var(--text); }

/* ──── View ──── */
.view {
  position: relative;
  z-index: 1;
  width: min(var(--shell-max), calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0 80px;
  min-height: calc(100vh - 56px - 48px);
}

body[data-view] .view { animation: view-in 360ms var(--ease) both; }

@keyframes view-in {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ──── Common riddle scene chrome ──── */
.scene {
  display: grid;
  gap: 24px;
}

.scene-head {
  display: grid;
  gap: 8px;
  max-width: 760px;
}

.scene-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0;
  text-transform: uppercase;
}

.scene-eyebrow::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent);
}

.scene-title {
  margin: 0;
  font-size: clamp(1.8rem, 3vw + 1rem, 2.8rem);
  font-weight: 700;
  letter-spacing: 0;
  line-height: 1.05;
}

.scene-lede {
  margin: 0;
  color: var(--muted);
  font-size: 1.06rem;
  line-height: 1.55;
  max-width: 680px;
}

.scene-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 360px);
  align-items: start;
}

@media (max-width: 920px) {
  .scene-grid { grid-template-columns: 1fr; }
}

.panel {
  border: 1px solid var(--border);
  background: var(--bg-soft);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow-1);
}

.panel + .panel { margin-top: 16px; }

.panel-title {
  margin: 0 0 8px;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0;
  text-transform: uppercase;
  color: var(--muted);
}

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

.stage {
  position: relative;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-soft);
  overflow: hidden;
  min-height: 460px;
  padding: 24px;
  box-shadow: var(--shadow-2);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 0.92rem;
  font-weight: 500;
  letter-spacing: 0;
  transition: background 160ms var(--ease), border-color 160ms var(--ease), transform 160ms var(--ease);
  white-space: nowrap;
}

.btn:hover { background: var(--surface-2); border-color: var(--border-strong); }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn.primary {
  background: var(--accent);
  color: #1a1505;
  border-color: transparent;
  font-weight: 600;
}

.btn.primary:hover { background: #fbd070; }

.btn.ghost {
  background: transparent;
  border-color: var(--border);
}

.btn.danger {
  background: rgba(248, 113, 113, 0.12);
  border-color: rgba(248, 113, 113, 0.32);
  color: #fecaca;
}

.btn-group {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

/* Story steps */
.story-steps {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

/* Block layout with an absolutely-positioned badge. Using a grid here split
   each step's <strong> and its trailing text into separate grid items, wrapping
   the text into the 28px number column (one word per line). Block flow keeps
   the inline <strong> + text together and wrapping across the full width. */
.story-steps li {
  position: relative;
  padding-left: 40px;
  min-height: 24px;
  color: var(--muted);
  line-height: 1.5;
  counter-increment: step;
}

.story-steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
}

.story-steps li strong {
  color: var(--text);
  font-weight: 600;
}

/* Solution reveal */
.solution {
  border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(244, 195, 91, 0.05), transparent 40%), var(--bg-soft);
  border-radius: var(--radius);
  padding: 20px;
}

.solution[hidden] { display: none; }

.solution-title {
  margin: 0 0 8px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0;
  text-transform: uppercase;
}

.solution p {
  margin: 0 0 10px;
  color: var(--text);
  line-height: 1.55;
}

.solution p:last-child { margin-bottom: 0; }
.solution code {
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.88em;
  padding: 1px 6px;
  background: var(--surface);
  border-radius: 4px;
  border: 1px solid var(--border);
}

/* Status pill */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 500;
}

.pill.good { background: rgba(74, 222, 128, 0.12); border-color: rgba(74, 222, 128, 0.3); color: #86efac; }
.pill.bad { background: rgba(248, 113, 113, 0.12); border-color: rgba(248, 113, 113, 0.3); color: #fecaca; }
.pill.info { background: rgba(96, 165, 250, 0.12); border-color: rgba(96, 165, 250, 0.3); color: #bfdbfe; }

/* Footer */
.footer {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 24px 16px 40px;
  color: var(--dim);
  font-size: 0.85rem;
}

.footer a:hover { color: var(--accent); }
.footer .dot { color: var(--dim); }

/* Toast */
.toast {
  position: fixed;
  top: 76px;
  right: 20px;
  z-index: 8;
  width: min(380px, calc(100% - 32px));
  padding: 12px 16px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: rgba(17, 20, 31, 0.96);
  backdrop-filter: blur(12px);
  color: var(--text);
  box-shadow: var(--shadow-2);
  opacity: 0;
  transform: translateY(-12px);
  transition: opacity 220ms var(--ease), transform 220ms var(--ease);
  pointer-events: none;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

/* Flying marble / particles helper */
.flying {
  position: fixed;
  z-index: 4;
  pointer-events: none;
  will-change: transform;
}

.screen-flash::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 3;
  pointer-events: none;
  background: rgba(244, 195, 91, 0.12);
  animation: flash 520ms ease-out forwards;
}

@keyframes flash {
  from { opacity: 1; }
  to { opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 1ms !important;
    transition-duration: 1ms !important;
  }
}