.proof-puzzle {
  --puzzle-border: color-mix(in srgb, var(--parigaux-bleu) 28%, transparent);
  box-sizing: border-box;
  width: min(58rem, calc(100% - 1rem));
  max-width: 58rem;
  margin: 1.75rem auto;
  border: 1px solid var(--puzzle-border);
  border-radius: 1rem;
  padding: clamp(1rem, 3vw, 1.6rem);
  background: color-mix(in srgb, var(--pst-color-background) 94%, var(--parigaux-bleu-clair));
  box-shadow: 0 0.45rem 1.6rem rgba(18, 42, 56, 0.08);
}

.proof-puzzle-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.proof-puzzle-heading h2 {
  margin: 0.05rem 0 0;
  font-size: clamp(1.45rem, 3vw, 2rem);
}

.proof-puzzle-eyebrow {
  color: var(--parigaux-orange);
  font-size: 0.74rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.proof-puzzle-count {
  flex: none;
  border-radius: 999px;
  padding: 0.28rem 0.65rem;
  background: color-mix(in srgb, var(--parigaux-bleu) 10%, transparent);
  color: var(--pst-color-text-base);
  font-size: 0.78rem;
  font-weight: 700;
}

.proof-puzzle-instructions {
  margin: 0.7rem 0 1.15rem;
}

.docutils.container.proof-puzzle-property {
  position: relative;
  margin: 2.6rem 0 1.8rem;
  border: 1.5px solid color-mix(in srgb, var(--pst-color-text-base) 78%, transparent);
  border-radius: 0;
  padding: 2rem 1.7rem 1.25rem;
  background: var(--pst-color-background);
}

.docutils.container.proof-puzzle-property > .rubric {
  position: absolute;
  top: 0;
  left: 1.25rem;
  display: block;
  margin: 0;
  border: 1.5px solid color-mix(in srgb, var(--pst-color-text-base) 78%, transparent);
  border-radius: 0.65rem;
  padding: 0.38rem 0.9rem 0.42rem;
  background: var(--pst-color-background);
  color: var(--parigaux-bleu);
  font-family: 'EB Garamond', serif;
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0;
  line-height: 1.2;
  text-transform: none;
  transform: translateY(-50%);
}

.docutils.container.proof-puzzle-property > :last-child { margin-bottom: 0; }

.proof-puzzle-list {
  display: grid;
  gap: 0.65rem;
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
}

.proof-puzzle-step {
  position: relative;
  display: grid;
  grid-template-columns: 2.5rem minmax(0, 1fr);
  align-items: center;
  gap: 0.65rem;
  margin: 0;
  border: 1px solid var(--puzzle-border);
  border-radius: 0.75rem;
  padding: 0.7rem;
  background: var(--pst-color-background);
  box-shadow: 0 0.12rem 0.35rem rgba(18, 42, 56, 0.06);
  transition: border-color 150ms ease, box-shadow 150ms ease, transform 150ms ease;
  cursor: pointer;
}

.proof-puzzle-step:hover,
.proof-puzzle-step:focus-within {
  border-color: color-mix(in srgb, var(--parigaux-bleu) 58%, transparent);
  box-shadow: 0 0.2rem 0.7rem rgba(18, 42, 56, 0.12);
}

.proof-puzzle-step-content > :first-child { margin-top: 0; }
.proof-puzzle-step-content > :last-child { margin-bottom: 0; }
.proof-puzzle-step-content .math { overflow-wrap: anywhere; }

.proof-puzzle-handle {
  display: inline-grid;
  place-items: center;
  border: 1px solid transparent;
  border-radius: 0.55rem;
  background: transparent;
  color: var(--pst-color-text-muted);
}

.proof-puzzle-handle {
  width: 2.5rem;
  height: 2.9rem;
  cursor: grab;
  touch-action: none;
  font-size: 1.35rem;
}

.proof-puzzle-handle:active { cursor: grabbing; }

.proof-puzzle-handle:hover,
.proof-puzzle-handle:focus-visible {
  border-color: var(--puzzle-border);
  background: color-mix(in srgb, var(--parigaux-bleu) 9%, transparent);
  color: var(--pst-color-primary);
  outline: none;
}

.proof-puzzle-step.is-selected {
  border-color: var(--parigaux-bleu);
  outline: 0.18rem solid color-mix(in srgb, var(--parigaux-bleu) 18%, transparent);
}

.proof-puzzle.has-selected .proof-puzzle-step:not(.is-selected) {
  cursor: copy;
}

.proof-puzzle.has-selected .proof-puzzle-step:not(.is-selected):hover::before {
  content: "Placer ici";
  position: absolute;
  z-index: 2;
  top: -0.55rem;
  left: 3.1rem;
  border-radius: 999px;
  padding: 0.08rem 0.48rem;
  background: var(--parigaux-bleu);
  color: white;
  font-size: 0.65rem;
  font-weight: 750;
}

.proof-puzzle-placeholder {
  box-sizing: border-box;
  border: 0.16rem dashed color-mix(in srgb, var(--parigaux-bleu) 62%, transparent);
  border-radius: 0.75rem;
  background: color-mix(in srgb, var(--parigaux-bleu) 8%, transparent);
  list-style: none;
}

body.proof-puzzle-drag-active {
  cursor: grabbing;
  user-select: none;
}

.proof-puzzle-ghost {
  position: fixed;
  z-index: 1100;
  max-height: 9rem;
  overflow: hidden;
  pointer-events: none;
  opacity: 0.94;
  transform: rotate(0.6deg);
  box-shadow: 0 0.8rem 2rem rgba(18, 42, 56, 0.24);
}

.proof-puzzle-step.is-correct {
  border-color: color-mix(in srgb, var(--parigaux-vert) 72%, transparent);
  background: color-mix(in srgb, var(--parigaux-vert) 9%, var(--pst-color-background));
}

.proof-puzzle-step.is-wrong {
  border-color: color-mix(in srgb, var(--parigaux-orange) 65%, transparent);
  background: color-mix(in srgb, var(--parigaux-orange) 7%, var(--pst-color-background));
}

.proof-puzzle-step.is-correct::after,
.proof-puzzle-step.is-wrong::after {
  position: absolute;
  top: -0.42rem;
  right: 0.55rem;
  border-radius: 999px;
  padding: 0.06rem 0.4rem;
  color: white;
  font-size: 0.62rem;
  font-weight: 750;
}

.proof-puzzle-step.is-correct::after {
  content: "Bien placé";
  background: var(--parigaux-vert);
}

.proof-puzzle-step.is-wrong::after {
  content: "À déplacer";
  background: var(--parigaux-orange);
}

.proof-puzzle-actions-slot {
  margin-top: 1rem;
}

.proof-puzzle-actions {
  position: relative;
  z-index: 10;
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  box-sizing: border-box;
  margin: 0 -0.4rem;
  border: 1px solid var(--puzzle-border);
  border-radius: 0.75rem;
  padding: 0.6rem;
  background: color-mix(in srgb, var(--pst-color-background) 92%, transparent);
  box-shadow: 0 0.45rem 1.25rem rgba(18, 42, 56, 0.14);
  backdrop-filter: blur(10px);
}

.proof-puzzle-actions.is-fixed {
  position: fixed;
  z-index: 1000;
  right: auto;
  bottom: max(0.7rem, env(safe-area-inset-bottom));
  left: 50%;
  width: min(56rem, calc(100vw - 1.5rem));
  margin: 0;
  transform: translateX(-50%);
}

.proof-puzzle-actions button {
  border: 1px solid color-mix(in srgb, var(--parigaux-bleu) 48%, transparent);
  border-radius: 0.55rem;
  padding: 0.5rem 0.9rem;
  background: transparent;
  color: var(--pst-color-text-base);
  font-weight: 680;
}

.proof-puzzle-actions button:hover,
.proof-puzzle-actions button:focus-visible {
  background: color-mix(in srgb, var(--parigaux-bleu) 10%, transparent);
}

.proof-puzzle-actions .proof-puzzle-primary {
  border-color: var(--parigaux-bleu);
  background: var(--parigaux-bleu);
  color: white;
}

.proof-puzzle-actions .proof-puzzle-primary:hover,
.proof-puzzle-actions .proof-puzzle-primary:focus-visible {
  background: color-mix(in srgb, var(--parigaux-bleu) 82%, black);
}

.proof-puzzle-actions button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.proof-puzzle-place-end {
  width: 100%;
  margin-top: 0.65rem;
  border: 0.13rem dashed color-mix(in srgb, var(--parigaux-bleu) 58%, transparent);
  border-radius: 0.65rem;
  padding: 0.65rem;
  background: color-mix(in srgb, var(--parigaux-bleu) 7%, transparent);
  color: var(--pst-color-primary);
  font-weight: 700;
}

.proof-puzzle-actions .proof-puzzle-feedback {
  flex: 1 0 100%;
  margin: 0;
}

.proof-puzzle-place-end:hover,
.proof-puzzle-place-end:focus-visible {
  border-style: solid;
  background: color-mix(in srgb, var(--parigaux-bleu) 13%, transparent);
}

.proof-puzzle-feedback {
  margin: 0.85rem 0 0;
  border-radius: 0.55rem;
  padding: 0.6rem 0.75rem;
  background: color-mix(in srgb, var(--parigaux-bleu) 8%, transparent);
}

.proof-puzzle.is-complete .proof-puzzle-feedback {
  background: color-mix(in srgb, var(--parigaux-vert) 13%, transparent);
  color: color-mix(in srgb, var(--parigaux-vert) 70%, var(--pst-color-text-base));
  font-weight: 700;
}

.proof-puzzle-hint-dialog {
  width: min(36rem, calc(100vw - 2rem));
  max-height: min(75vh, 32rem);
  border: 1px solid color-mix(in srgb, var(--pst-color-text-muted) 42%, transparent);
  border-radius: 0.75rem;
  padding: 1rem 1.1rem;
  background: var(--pst-color-background);
  color: var(--pst-color-text-base);
  box-shadow: 0 1rem 3rem rgba(18, 42, 56, 0.22);
  overflow-y: auto;
}

.proof-puzzle-hint-dialog::backdrop {
  background: rgba(18, 42, 56, 0.34);
  backdrop-filter: blur(2px);
}

.proof-puzzle-hint-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border-bottom: 1px solid color-mix(in srgb, var(--pst-color-text-muted) 28%, transparent);
  padding-bottom: 0.55rem;
}

.proof-puzzle-hint-heading h3 { margin: 0; }

.proof-puzzle-hint-dialog button {
  border: 1px solid color-mix(in srgb, var(--parigaux-bleu) 48%, transparent);
  border-radius: 0.5rem;
  padding: 0.42rem 0.75rem;
  background: transparent;
  color: var(--pst-color-text-base);
  font-weight: 680;
}

.proof-puzzle-hint-dialog button:hover,
.proof-puzzle-hint-dialog button:focus-visible {
  background: color-mix(in srgb, var(--parigaux-bleu) 10%, transparent);
}

.proof-puzzle-hint-output {
  margin: 1rem 0;
  padding-left: 1.6rem;
}

.proof-puzzle-hint-output li + li { margin-top: 0.45rem; }

.proof-puzzle [hidden] { display: none !important; }

html[data-theme="dark"] .proof-puzzle {
  --puzzle-border: color-mix(in srgb, var(--parigaux-bleu-clair) 30%, transparent);
  box-shadow: none;
}

html[data-theme="dark"] .proof-puzzle-step.is-selected {
  border-color: var(--parigaux-bleu-clair);
  outline-color: color-mix(in srgb, var(--parigaux-bleu-clair) 20%, transparent);
}

html[data-theme="dark"] .proof-puzzle-actions { box-shadow: none; }
html[data-theme="dark"] .proof-puzzle-hint-dialog { box-shadow: none; }

@media (max-width: 576px) {
  .proof-puzzle { padding: 0.85rem; }
  .docutils.container.proof-puzzle-property {
    margin-top: 2.3rem;
    padding: 1.8rem 1rem 1rem;
  }
  .docutils.container.proof-puzzle-property > .rubric {
    left: 0.75rem;
    font-size: 1rem;
  }
  .proof-puzzle-heading { display: block; }
  .proof-puzzle-count { display: inline-block; margin-top: 0.55rem; }
  .proof-puzzle-step {
    grid-template-columns: 2.2rem minmax(0, 1fr);
    gap: 0.45rem;
    padding: 0.6rem;
  }
  .proof-puzzle-handle { width: 2.2rem; }
  .proof-puzzle-actions button { flex: 1 1 8rem; }
}

@media (prefers-reduced-motion: reduce) {
  .proof-puzzle-step { transition: none; }
}