:root {
  --ink: #35252b;
  --muted: #8b7379;
  --rose: #e84d70;
  --rose-dark: #c62348;
  --pink: #ffd9e4;
  --blush: #fff2f6;
  --line: #ded7db;
  --shadow: 0 18px 50px rgba(155, 64, 91, 0.18);
  --soft-shadow: 0 12px 30px rgba(88, 47, 58, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  min-height: 100svh;
  margin: 0;
  overflow-x: hidden;
  background: #ffffff;
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
input,
textarea {
  font: inherit;
}

#heartField {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.floating-heart {
  position: absolute;
  left: var(--heart-left);
  top: 108vh;
  width: var(--heart-size);
  height: var(--heart-size);
  background: var(--heart-color);
  opacity: var(--heart-opacity);
  animation: floatHeart var(--heart-duration) linear infinite;
  animation-delay: var(--heart-delay);
  transform: rotate(45deg);
  filter: drop-shadow(0 8px 16px rgba(198, 35, 72, 0.12));
}

.floating-heart::before,
.floating-heart::after {
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: inherit;
}

.floating-heart::before {
  left: -50%;
}

.floating-heart::after {
  top: -50%;
}

@keyframes floatHeart {
  0% {
    transform: translate3d(0, 0, 0) rotate(45deg) scale(0.82);
  }
  50% {
    transform: translate3d(var(--heart-sway), -55vh, 0) rotate(58deg) scale(1);
  }
  100% {
    transform: translate3d(calc(var(--heart-sway) * -0.55), -118vh, 0) rotate(45deg) scale(0.9);
  }
}

.page {
  position: relative;
  z-index: 1;
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0 20px;
}

.puzzle-layout {
  display: grid;
  grid-template-columns: minmax(320px, 1fr) minmax(300px, 380px);
  gap: clamp(18px, 3vw, 34px);
  align-items: start;
}

.board-section {
  display: flex;
  justify-content: center;
  padding-top: 80px;
}

.board-frame {
  width: 100%;
  max-width: 670px;
  padding: clamp(12px, 2vw, 20px);
  border: 1px solid rgba(232, 77, 112, 0.12);
  border-radius: 26px;
  background: rgba(255, 255, 255, 0.86);
  box-shadow: var(--shadow);
}

.puzzle-board {
  position: relative;
  width: 100%;
  min-height: 320px;
  border: 1px solid #ece8eb;
  border-radius: 24px;
  background:
    radial-gradient(circle at 18% 14%, rgba(255, 217, 228, 0.7), transparent 30%),
    linear-gradient(135deg, #fff8fa 0%, #f7f7f9 100%);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.88);
  overflow: visible;
}

.slot-layer,
.piece-layer {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  overflow: hidden;
}

.slot-outline {
  position: absolute;
  overflow: visible;
  pointer-events: none;
}

.slot-outline path {
  fill: rgba(255, 255, 255, 0.42);
  stroke: #d8d2d7;
  stroke-width: 1.45;
  vector-effect: non-scaling-stroke;
}

.piece {
  position: relative;
  display: block;
  flex: 0 0 auto;
  padding: 0;
  border: 0;
  appearance: none;
  background-color: transparent;
  background-repeat: no-repeat;
  cursor: grab;
  touch-action: none;
  filter: drop-shadow(0 9px 12px rgba(77, 41, 51, 0.17));
  transition:
    transform 180ms ease,
    filter 180ms ease,
    opacity 180ms ease;
  will-change: transform;
}

.piece::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.26), transparent 32%),
    linear-gradient(315deg, rgba(0, 0, 0, 0.14), transparent 34%);
  pointer-events: none;
}

.piece-outline {
  position: absolute;
  inset: 0;
  z-index: 2;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.piece-outline path {
  fill: none;
  stroke: rgba(88, 47, 58, 0.42);
  stroke-linejoin: round;
  stroke-width: 1.35;
  vector-effect: non-scaling-stroke;
}

.piece:hover {
  transform: translateY(-3px) scale(1.02);
  filter: drop-shadow(0 14px 18px rgba(77, 41, 51, 0.2));
}

.piece:active {
  cursor: grabbing;
}

.board-piece {
  position: absolute;
  cursor: default;
  filter: none;
}

.board-piece:hover {
  transform: none;
  filter: none;
}

.dragging-piece {
  position: fixed;
  z-index: 50;
  pointer-events: none;
  cursor: grabbing;
  transform: scale(1.04);
  filter: drop-shadow(0 18px 22px rgba(77, 41, 51, 0.28));
  transition:
    left 260ms cubic-bezier(0.18, 0.82, 0.22, 1),
    top 260ms cubic-bezier(0.18, 0.82, 0.22, 1),
    width 260ms cubic-bezier(0.18, 0.82, 0.22, 1),
    height 260ms cubic-bezier(0.18, 0.82, 0.22, 1),
    transform 260ms cubic-bezier(0.18, 0.82, 0.22, 1),
    opacity 180ms ease;
}

.piece-hidden {
  visibility: hidden;
}

.piece.wrong {
  animation: wrongDrop 420ms ease;
}

@keyframes wrongDrop {
  0%,
  100% {
    transform: translateX(0);
  }
  22% {
    transform: translateX(-9px) rotate(-2deg);
  }
  48% {
    transform: translateX(8px) rotate(2deg);
  }
  74% {
    transform: translateX(-5px) rotate(-1deg);
  }
}

.side-panel {
  display: grid;
  gap: 18px;
}

.reference-image {
  display: block;
  width: min(100%, 260px);
  height: auto;
  justify-self: center;
}

.pieces-section {
  padding: 16px;
  border: 1px solid rgba(232, 77, 112, 0.14);
  border-radius: 20px;
  background: rgba(255, 242, 246, 0.78);
  box-shadow: var(--soft-shadow);
}

.section-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.section-heading h2 {
  margin: 0;
  font-size: 1rem;
}

.section-heading p {
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 700;
}

.pieces-tray {
  display: flex;
  flex-wrap: wrap;
  min-height: 230px;
  max-height: min(46vh, 430px);
  align-content: flex-start;
  align-items: flex-start;
  gap: 8px;
  overflow-y: auto;
  padding: 8px;
  border: 1px dashed rgba(198, 35, 72, 0.18);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.74);
}

.pieces-tray::-webkit-scrollbar {
  width: 9px;
}

.pieces-tray::-webkit-scrollbar-thumb {
  border: 2px solid rgba(255, 255, 255, 0.8);
  border-radius: 999px;
  background: rgba(232, 77, 112, 0.35);
}

.sparkle {
  position: absolute;
  left: var(--spark-x);
  top: var(--spark-y);
  z-index: 20;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--spark-color);
  box-shadow: 0 0 12px var(--spark-color);
  pointer-events: none;
  animation: sparkleBurst 650ms ease-out forwards;
}

@keyframes sparkleBurst {
  0% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(0.4);
  }
  100% {
    opacity: 0;
    transform: translate(
        calc(-50% + var(--spark-dx)),
        calc(-50% + var(--spark-dy))
      )
      scale(1.25);
  }
}

footer {
  position: relative;
  z-index: 1;
  padding: 18px 16px 24px;
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
}

@media (min-width: 700px) and (max-width: 920px) {
  .page {
    width: min(820px, calc(100% - 28px));
    padding: 18px 0 10px;
  }

  .puzzle-layout {
    grid-template-columns: minmax(0, 1fr) 230px;
    gap: 16px;
  }

  .board-frame {
    max-width: 530px;
    padding: 12px;
    border-radius: 22px;
  }

  .puzzle-board {
    border-radius: 20px;
  }

  .side-panel {
    width: auto;
    gap: 12px;
    margin: 0;
  }

  .reference-image {
    width: min(100%, 170px);
  }

  .pieces-section {
    padding: 12px;
    border-radius: 16px;
  }

  .section-heading {
    margin-bottom: 10px;
  }

  .pieces-tray {
    min-height: 250px;
    max-height: calc(100svh - 390px);
    gap: 6px;
    padding: 6px;
  }

  footer {
    padding: 12px 16px 16px;
  }
}

@media (min-width: 921px) and (max-height: 900px) {
  .page {
    width: min(1100px, calc(100% - 28px));
    padding: 18px 0 10px;
  }

  .puzzle-layout {
    grid-template-columns: minmax(0, 1fr) minmax(260px, 320px);
    gap: 18px;
  }

  .board-frame {
    max-width: 600px;
    padding: 14px;
    border-radius: 22px;
  }

  .puzzle-board {
    border-radius: 20px;
  }

  .side-panel {
    gap: 12px;
  }

  .reference-image {
    width: min(100%, 210px);
  }

  .pieces-section {
    padding: 12px;
  }

  .pieces-tray {
    min-height: 210px;
    max-height: calc(100svh - 355px);
  }

  footer {
    padding: 12px 16px 16px;
  }
}

@media (max-width: 699px) {
  .page {
    width: min(720px, calc(100% - 24px));
  }

  .puzzle-layout {
    grid-template-columns: 1fr;
  }

  .side-panel {
    width: min(520px, 100%);
    margin: 0 auto;
  }

  .pieces-tray {
    max-height: none;
  }
}

@media (max-width: 560px) {
  .page {
    padding-top: 22px;
  }

  .board-frame,
  .pieces-section {
    border-radius: 18px;
  }

  .puzzle-board {
    min-height: 260px;
    border-radius: 18px;
  }

  .section-heading {
    align-items: flex-start;
    flex-direction: column;
    gap: 4px;
  }

  .pieces-tray {
    min-height: 210px;
    gap: 6px;
    padding: 7px;
  }
}