@import url('https://fonts.googleapis.com/css2?family=Press+Start+2P&display=swap');

:root {
  --pink: #ff6b9d;
  --mint: #7bd389;
  --lavender: #b388ff;
  --yellow: #ffd93d;
  --sky: #80d8ff;
  --dark: #311b92;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: linear-gradient(135deg, #fce4ec 0%, #f3e5f5 40%, #e8eaf6 100%);
  min-height: 100vh;
  padding: 30px 20px;
  color: var(--dark);
  position: relative;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(circle at 10% 20%, rgba(255, 107, 157, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 90% 80%, rgba(179, 136, 255, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 50% 50%, rgba(123, 211, 137, 0.05) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

header {
  text-align: center;
  margin-bottom: 50px;
  position: relative;
  z-index: 1;
}

header h1 {
  font-family: 'Press Start 2P', monospace;
  font-size: 1.5rem;
  color: var(--dark);
  text-shadow: 3px 3px 0 var(--pink), 6px 6px 0 rgba(255, 107, 157, 0.2);
  margin-bottom: 15px;
  line-height: 1.6;
  word-break: break-word;
}

header p {
  font-size: 1.1rem;
  color: #7c4dff;
  font-weight: 500;
  letter-spacing: 1px;
}

footer {
  text-align: center;
  margin-top: 60px;
  padding: 20px;
  color: #9575cd;
  font-size: 0.9rem;
  position: relative;
  z-index: 1;
}

#ejercicios-grid {
  max-width: 1100px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.seccion {
  margin-bottom: 50px;
}

.seccion-titulo {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 3px dashed var(--lavender);
}

.seccion-nombre {
  font-family: 'Press Start 2P', monospace;
  font-size: 1rem;
  color: var(--dark);
}

.seccion-contador {
  font-family: 'Press Start 2P', monospace;
  font-size: 0.7rem;
  color: var(--lavender);
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 28px;
}

.card {
  background: white;
  border-radius: 16px;
  padding: 25px 20px 20px;
  position: relative;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  border: 3px solid var(--dark);
  box-shadow: 6px 6px 0 0 var(--dark);
}

.card:hover {
  transform: translate(-3px, -3px);
  box-shadow: 9px 9px 0 0 var(--dark);
}

.card:active {
  transform: translate(1px, 1px);
  box-shadow: 3px 3px 0 0 var(--dark);
}

.card-number {
  font-family: 'Press Start 2P', monospace;
  font-size: 0.7rem;
  background: var(--pink);
  color: white;
  padding: 5px 10px;
  border-radius: 8px;
  display: inline-block;
  margin-bottom: 12px;
  align-self: flex-start;
  border: 2px solid var(--dark);
  box-shadow: 2px 2px 0 0 var(--dark);
}

.card h2 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 8px;
}

.btn {
  font-family: 'Press Start 2P', monospace;
  font-size: 0.6rem;
  background: var(--dark);
  color: white;
  padding: 10px 16px;
  border-radius: 10px;
  text-decoration: none;
  text-align: center;
  display: inline-block;
  transition: all 0.15s ease;
  border: 2px solid var(--dark);
  box-shadow: 3px 3px 0 0 rgba(0,0,0,0.2);
  letter-spacing: 0.5px;
}

.btn:hover {
  background: #4527a0;
  transform: translate(-1px, -1px);
  box-shadow: 4px 4px 0 0 rgba(0,0,0,0.2);
}

.btn:active {
  transform: translate(1px, 1px);
  box-shadow: 1px 1px 0 0 rgba(0,0,0,0.2);
}

.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 20px;
  background: white;
  border-radius: 16px;
  border: 3px dashed var(--lavender);
  color: #9575cd;
}

.empty-state h2 {
  font-family: 'Press Start 2P', monospace;
  font-size: 1rem;
  margin-bottom: 10px;
}

/* Exercise page styles */
.exercise-page {
  max-width: 700px;
  margin: 0 auto;
  background: white;
  border-radius: 16px;
  padding: 40px;
  border: 3px solid var(--dark);
  box-shadow: 6px 6px 0 0 var(--dark);
  position: relative;
  z-index: 1;
}

.back-link {
  display: inline-block;
  font-family: 'Press Start 2P', monospace;
  font-size: 0.6rem;
  color: var(--dark);
  text-decoration: none;
  margin-bottom: 25px;
  padding: 8px 12px;
  border-radius: 8px;
  border: 2px solid var(--dark);
  box-shadow: 2px 2px 0 0 var(--dark);
  transition: all 0.15s ease;
}

.back-link:hover {
  background: var(--dark);
  color: white;
  transform: translate(-1px, -1px);
  box-shadow: 3px 3px 0 0 var(--dark);
}

.exercise-page h1 {
  font-family: 'Press Start 2P', monospace;
  font-size: 1.2rem;
  margin-bottom: 20px;
  color: var(--dark);
  line-height: 1.5;
}

.exercise-page p {
  font-size: 1rem;
  color: #555;
  margin-bottom: 10px;
  line-height: 1.6;
}

.btn-abrir, .btn-comprobar {
  cursor: pointer;
  font-family: 'Press Start 2P', monospace;
  font-size: 0.6rem;
  background: var(--dark);
  color: white;
  padding: 10px 16px;
  border-radius: 10px;
  border: 2px solid var(--dark);
  box-shadow: 3px 3px 0 0 rgba(0,0,0,0.2);
  letter-spacing: 0.5px;
  transition: all 0.15s ease;
}

.btn-abrir:hover, .btn-comprobar:hover {
  background: #4527a0;
  transform: translate(-1px, -1px);
  box-shadow: 4px 4px 0 0 rgba(0,0,0,0.2);
}

.btn-abrir:active {
  transform: translate(1px, 1px);
  box-shadow: 1px 1px 0 0 rgba(0,0,0,0.2);
}

#play {
  text-align: center;
  display: flex;
  justify-content: center;
}


#enter-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 1em;
  display: none;
}

.input {
  width: 100%;
  padding: .5em;
  margin-right: 1em;
  font-family: 'Press Start 2P', monospace;
  font-size: 0.6rem;
  color: var(--dark);
  text-decoration: none;
  border-radius: 8px;
  border: 2px solid var(--dark);
  box-shadow: 2px 2px 0 0 var(--dark);
  transition: all 0.15s ease;
}

.box-comprobar {
  display: flex;
}

#tablas {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1em;
  flex-wrap: wrap;
}

@media (max-width: 600px) {
  header h1 { font-size: 1rem; }
  .cards-grid { grid-template-columns: 1fr; }
  .exercise-page { padding: 20px; }
  .exercise-page h1 { font-size: 0.9rem; }
  .seccion-nombre { font-size: 0.8rem; }
}