/* Puzzle 2x4 — Estética limpia y accesible para personas mayores. */

:root {
  --bg: #e8e0d6;
  --surface: #fff;
  --border: #c4b8a8;
  --text: #2c2c2c;
  --primary: #5a7a6a;
  --primary-hover: #4a6a5a;
  --accent: #da8c1f;
  --accent-hover: #c47a14;
  --accent-soft: rgba(201, 118, 46, 0.15);
  --shadow: rgba(0,0,0,0.08);
  --shadow-soft: rgba(0,0,0,0.05);
  --slot-size: min(22vw, 170px);
  --board-gap: calc(var(--slot-size) * 0.04);
  --pair-gap: calc(var(--slot-size) / 2);
  --layout-gap: calc(var(--slot-size) / 2);
  --lateral-center-offset: calc(2.5 * var(--slot-size) + 1.5 * var(--board-gap) + var(--layout-gap));
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 20px;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
  background-image:
    radial-gradient(circle, rgba(140, 115, 95, 0.28) 1.2px, transparent 1.2px),
    radial-gradient(ellipse 100% 70% at 20% 20%, rgba(200, 120, 50, 0.18) 0%, transparent 50%),
    radial-gradient(ellipse 90% 60% at 85% 85%, rgba(70, 95, 80, 0.14) 0%, transparent 50%),
    linear-gradient(180deg, #f2ebe2 0%, #e4dcd0 45%, #d8cec0 100%);
  background-size: 28px 28px, 100% 100%, 100% 100%, 100% 100%;
  background-attachment: fixed;
  min-height: 100vh;
}

.app {
  max-width: 1320px;
  margin: 0 auto;
  padding: 1.25rem;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
  background: linear-gradient(145deg, rgba(252, 248, 243, 0.85) 0%, rgba(242, 236, 228, 0.75) 100%);
  border-radius: 16px;
  box-shadow:
    0 0 0 1px rgba(140, 118, 95, 0.25),
    0 4px 24px rgba(0, 0, 0, 0.08);
}

.app::before {
  content: "";
  position: absolute;
  inset: 12px;
  border: 1px solid rgba(160, 140, 115, 0.45);
  border-radius: 10px;
  pointer-events: none;
}

.game-box .btn-back {
  position: absolute;
  top: 0.85rem;
  left: 0.85rem;
  z-index: 10;
}

.game-box .btn-change-image {
  position: absolute;
  top: 0.85rem;
  right: 0.85rem;
  z-index: 10;
}

.main {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 0;
}

.game-box {
  position: relative;
  /* Solo contenedor para centrar; sin estilos visibles */
}

/* Layout: piezas arriba, izquierda, derecha, abajo; tablero en el centro */
.game-layout {
  display: grid;
  grid-template-columns: var(--slot-size) calc(4 * var(--slot-size) + 3 * var(--board-gap)) var(--slot-size);
  grid-template-rows: var(--slot-size) calc(2 * var(--slot-size) + var(--board-gap)) var(--slot-size);
  grid-template-areas:
    ".         top-pieces ."
    "left-pieces board    right-pieces"
    ".         bottom-pieces .";
  gap: var(--layout-gap);
  align-items: center;
  justify-items: center;
}

.pieces-top {
  grid-area: top-pieces;
  display: grid;
  grid-template-columns: var(--slot-size) var(--slot-size);
  gap: var(--pair-gap);
  justify-content: center;
}

.pieces-left {
  grid-area: left-pieces;
  display: grid;
  grid-template-rows: var(--slot-size) var(--slot-size);
  gap: var(--pair-gap);
  justify-content: center;
}

.pieces-right {
  grid-area: right-pieces;
  display: grid;
  grid-template-rows: var(--slot-size) var(--slot-size);
  gap: var(--pair-gap);
  justify-content: center;
}

.pieces-bottom {
  grid-area: bottom-pieces;
  display: grid;
  grid-template-columns: var(--slot-size) var(--slot-size);
  gap: var(--pair-gap);
  justify-content: center;
}

/* Board: 2 rows x 4 columns con marco */
.board {
  grid-area: board;
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, var(--slot-size));
  grid-template-rows: repeat(2, var(--slot-size));
  gap: var(--board-gap);
  padding: var(--board-gap);
  border-radius: 12px;
  background: var(--border);
  border: 6px solid #a08b6e;
  box-shadow:
    0 0 0 2px rgba(160, 139, 110, 0.4),
    inset 0 1px 0 rgba(255, 255, 255, 0.2),
    0 6px 20px rgba(0, 0, 0, 0.12),
    0 2px 6px rgba(0, 0, 0, 0.06);
}

/* Imagen de fondo con baja opacidad como guía (se ve a través de los slots) */
.board-bg {
  position: absolute;
  inset: 0;
  border-radius: 6px;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  opacity: 0.45;
  pointer-events: none;
  z-index: 0;
  transition: opacity 0.6s ease;
}

.board .slot {
  z-index: 1;
}

.slot {
  width: var(--slot-size);
  height: var(--slot-size);
  background: rgba(255, 255, 255, 0.5);
  border: 3px dashed var(--border);
  border-radius: 6px;
  position: relative;
  overflow: hidden;
  transition: opacity 0.5s ease;
}

.slot.drag-over {
  border-color: var(--accent);
  border-width: 3px;
  background: var(--accent-soft);
}

.slot.filled {
  border-style: solid;
  border-color: var(--border);
}

.slot .piece {
  position: absolute;
  inset: 0;
  background-size: 400% 200%;
  background-repeat: no-repeat;
  pointer-events: none;
}

/* Animación de victoria: grid y piezas desaparecen, imagen nítida */
.game-box.victory .board .slot {
  opacity: 0;
  pointer-events: none;
}

.game-box.victory .board-bg {
  opacity: 1;
}

.game-box.victory .game-layout .piece {
  opacity: 0;
  pointer-events: none;
}

/* Piezas alrededor del tablero (todas las zonas) */
.game-layout .piece {
  width: var(--slot-size);
  height: var(--slot-size);
  background-size: 400% 200%;
  background-repeat: no-repeat;
  background-color: var(--surface);
  border: 3px solid var(--border);
  border-radius: 6px;
  cursor: grab;
  box-shadow: 0 2px 6px var(--shadow-soft);
  user-select: none;
  transition: opacity 0.5s ease;
}

.game-layout .piece:active {
  cursor: grabbing;
}

.game-layout .piece.dragging {
  opacity: 0.5;
  pointer-events: none;
}

/* Ghost que sigue el cursor al arrastrar con el ratón */
.piece-ghost {
  position: fixed;
  width: var(--slot-size);
  height: var(--slot-size);
  background-size: 400% 200%;
  background-repeat: no-repeat;
  background-color: var(--surface);
  pointer-events: none;
  z-index: 1000;
  border: 3px solid var(--accent);
  border-radius: 6px;
  box-shadow: 0 6px 16px rgba(0,0,0,0.2);
}

/* Buttons — texto grande para legibilidad */
.btn {
  padding: 0.65rem 1.2rem;
  font-size: 1.1rem;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--primary-hover);
}

.btn-primary:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

/* Botón principal del modal: naranja (accent) para coherencia con la app */
.modal-actions .btn-primary {
  background: var(--accent);
  color: #fff;
}

.modal-actions .btn-primary:hover {
  background: var(--accent-hover);
}

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border: 2px solid var(--border);
  font-size: 1.1rem;
}

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

.btn-back {
  background: var(--surface);
  color: var(--text);
  border: 2px solid var(--border);
}

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

.btn-change-image {
  background: var(--surface);
  color: var(--text);
  border: 2px solid var(--border);
}

.btn-change-image:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Modal — legible, limpio, coherente con la app */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1.5rem;
}

.modal-overlay[hidden] {
  display: none;
}

.modal {
  background: var(--surface);
  border-radius: 12px;
  padding: 1.5rem 1.75rem;
  max-width: 400px;
  width: 100%;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
  border: none;
  border-top: 4px solid var(--accent);
}

.modal-title {
  margin: 0 0 0.9rem;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.3;
}

.modal-text {
  margin: 0 0 1.15rem;
  font-size: 1.1rem;
  line-height: 1.5;
  color: var(--text);
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
}

.modal-actions .btn {
  min-width: 140px;
  padding: 0.65rem 1.2rem;
  font-size: 1.1rem;
}