/* ==========================================================================
   Joc interactiu de càlcul d'àrees per a 2n d'FP Bàsica
   Estils generals, components visuals i mecànica d'interacció drag-and-drop
   ========================================================================== */

:root {
  --primary: #0284c7;
  --primary-hover: #0369a1;
  --primary-light: #e0f2fe;
  --secondary: #d97706;
  --secondary-light: #fef3c7;
  --accent: #10b981;
  --accent-light: #d1fae5;
  --danger: #ef4444;
  --danger-light: #fee2e2;
  --bg-page: #f8fafc;
  --bg-card: #ffffff;
  --border-color: #cbd5e1;
  --text-main: #0f172a;
  --text-muted: #475569;
  --canvas-bg: #f1f5f9;
  --canvas-grid: #cbd5e1;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --font-family: system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

[data-theme="dark"] {
  --bg-page: #0b1120;
  --bg-card: #1e293b;
  --border-color: #334155;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --primary-light: #0c4a6e;
  --secondary-light: #78350f;
  --accent-light: #064e3b;
  --danger-light: #7f1d1d;
  --canvas-bg: #0f172a;
  --canvas-grid: #1e293b;
}

*, *::before, *::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-family);
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Capçalera principal */
header.game-header {
  background: var(--bg-card);
  border-bottom: 2px solid var(--border-color);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow-sm);
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.eyebrow {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--primary);
  margin: 0;
}

h1.game-title {
  font-size: 1.75rem;
  margin: 0.25rem 0 0.5rem 0;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 800;
  color: var(--text-main);
}

.badge-course {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  background: var(--secondary-light);
  color: var(--secondary);
  border: 1px solid var(--secondary);
}

.game-intro {
  color: var(--text-muted);
  margin: 0;
  font-size: 1rem;
  max-width: 900px;
}

/* Barra d'estat del joc (Scoreboard i Nav Nivells) */
.game-status-bar {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: var(--shadow-sm);
}

.levels-nav {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding: 0.25rem 0;
}

.btn-level-tab {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--bg-page);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 700;
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.btn-level-tab:hover {
  background: var(--primary-light);
  color: var(--primary);
  border-color: var(--primary);
}

.btn-level-tab.active {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
  box-shadow: 0 2px 4px rgba(2, 132, 199, 0.3);
}

.btn-level-tab.completed {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-level-tab.completed.active {
  background: var(--accent);
  color: #ffffff;
}

.score-panel {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.score-box {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}

.score-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 700;
}

.score-value {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--primary);
}

.quick-actions {
  display: flex;
  gap: 0.5rem;
}

.btn-action {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: var(--bg-page);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-action:hover {
  background: var(--primary-light);
  color: var(--primary);
  border-color: var(--primary);
}

/* Contingut principal */
main.game-container {
  max-width: 1380px;
  margin: 1.5rem auto;
  padding: 0 1.25rem;
}

/* Graella del repte: Escenari visual (esquerra) + Tauler matemàtic (dreta) */
.challenge-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 1.5rem;
  align-items: start;
}

@media (max-width: 1024px) {
  .challenge-grid {
    grid-template-columns: 1fr;
  }
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--shadow-md);
}

.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 0 0 0.5rem 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.card-subtitle {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

/* Escenari visual */
.stage-wrapper {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.visual-canvas-container {
  background: var(--canvas-bg);
  border: 2px dashed var(--canvas-grid);
  border-radius: var(--radius-md);
  position: relative;
  overflow: hidden;
  min-height: 420px;
  display: flex;
  align-items: center;
  justify-content: center;
  user-select: none;
  touch-action: none;
}

.visual-svg {
  width: 100%;
  height: 420px;
  display: block;
}

/* Magatzem de peces arrossegables */
.palette-container {
  background: var(--bg-page);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.85rem;
}

.palette-header {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.6rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.palette-items {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  min-height: 60px;
  align-items: center;
}

.draggable-item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.85rem;
  background: var(--bg-card);
  border: 2px solid var(--primary);
  color: var(--text-main);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 700;
  cursor: grab;
  user-select: none;
  touch-action: none;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.draggable-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.draggable-item:active, .draggable-item.dragging {
  cursor: grabbing;
  transform: scale(1.05);
  box-shadow: var(--shadow-lg);
  opacity: 0.85;
  z-index: 100;
}

.draggable-item.placed {
  opacity: 0.4;
  cursor: default;
  transform: none;
}

/* Indicadors de progrés de col·locació */
.placement-meter {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
}

.progress-bar-bg {
  flex: 1;
  height: 10px;
  background: var(--border-color);
  border-radius: 999px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--accent);
  width: 0%;
  transition: width 0.3s ease;
}

/* Tauler matemàtic i camps de resposta */
.math-board {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.formula-banner {
  background: linear-gradient(135deg, rgba(2, 132, 199, 0.08) 0%, rgba(99, 102, 241, 0.06) 100%);
  border: 1px solid rgba(2, 132, 199, 0.25);
  border-left: 6px solid var(--primary);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.06);
}

.formula-banner-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.6rem;
  font-size: 0.82rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--primary);
}

.formula-banner-title {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.formula-badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  background: var(--bg-card);
  color: var(--primary);
  border: 1px solid rgba(2, 132, 199, 0.3);
  text-transform: none;
  letter-spacing: normal;
}

.formula-display-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  margin: 0.6rem 0;
  text-align: center;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.04);
}

.formula-display-box .formula-math {
  margin: 0.35rem 0;
}

.formula-display-box .katex-display {
  margin: 0.3rem 0 !important;
  font-size: 1.2rem;
}

.formula-legend {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.45;
  margin-top: 0.5rem;
  padding-top: 0.5rem;
  border-top: 1px dashed var(--border-color);
}

.step-box {
  background: var(--bg-page);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
}

.step-header {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 0.6rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.step-fields {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.85rem;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.input-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
}

.input-with-unit {
  display: flex;
  align-items: center;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  overflow: hidden;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.input-with-unit:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.2);
}

.input-with-unit input {
  flex: 1;
  border: none;
  background: transparent;
  padding: 0.55rem 0.75rem;
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--text-main);
  outline: none;
}

.input-with-unit .unit {
  padding: 0.55rem 0.75rem;
  background: var(--bg-page);
  border-left: 1px solid var(--border-color);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
}

/* Botons de validació */
.btn-validate-math {
  width: 100%;
  background: var(--primary);
  color: #ffffff;
  border: none;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 2px 4px rgba(2, 132, 199, 0.25);
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.btn-validate-math:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(2, 132, 199, 0.35);
}

.btn-validate-math:active {
  transform: translateY(0);
}

/* Feedback educatiu */
.feedback-box {
  padding: 0.85rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  line-height: 1.45;
  display: none;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

.feedback-box.error {
  display: block;
  background: var(--danger-light);
  border: 1px solid var(--danger);
  color: var(--text-main);
}

.feedback-box.warning {
  display: block;
  background: var(--secondary-light);
  border: 1px solid var(--secondary);
  color: var(--text-main);
}

.feedback-box.success {
  display: block;
  background: var(--accent-light);
  border: 1px solid var(--accent);
  color: var(--text-main);
}

/* Botó d'avançar nivell */
.btn-next-level {
  display: none;
  width: 100%;
  background: var(--accent);
  color: #ffffff;
  border: none;
  padding: 0.85rem 1.5rem;
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 1.05rem;
  font-weight: 800;
  cursor: pointer;
  box-shadow: 0 4px 10px rgba(16, 185, 129, 0.3);
  transition: all 0.2s ease;
  text-align: center;
}

.btn-next-level:hover {
  filter: brightness(1.1);
  transform: translateY(-2px);
}

/* Modal de guia / fórmules */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(2px);
  z-index: 100;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
}

.modal-overlay.active {
  display: flex;
}

.modal-content {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  max-width: 650px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  padding: 1.5rem;
  box-shadow: var(--shadow-lg);
  position: relative;
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: transparent;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-muted);
}

.modal-close:hover {
  color: var(--danger);
}

/* Pantalla final de superació */
.congrats-card {
  text-align: center;
  padding: 2.5rem 1.5rem;
}

.congrats-badge {
  font-size: 3.5rem;
  margin-bottom: 0.5rem;
}

.score-display-big {
  font-size: 2.75rem;
  font-weight: 900;
  color: var(--accent);
  margin: 1rem 0;
}

.results-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
}

.results-table th, .results-table td {
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--border-color);
  text-align: left;
}

.results-table th {
  background: var(--bg-page);
  font-weight: 700;
}

.btn-print {
  background: var(--secondary);
  color: #ffffff;
  border: none;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-md);
  font-weight: 700;
  cursor: pointer;
  margin-right: 0.5rem;
}

.btn-print:hover {
  filter: brightness(1.1);
}

@media print {
  header.game-header, .game-status-bar, .quick-actions, .btn-print, .btn-action {
    display: none !important;
  }
  body {
    background: #ffffff !important;
    color: #000000 !important;
  }
  .card {
    border: none !important;
    box-shadow: none !important;
  }
}