/* Synthwave/Retro Theme */
:root {
  --bg: #050510;
  --neon-cyan: #0ff;
  --neon-pink: #f0f;
  --neon-yellow: #ff0;
  --text-main: #fff;
  --grid-color: rgba(0, 255, 255, 0.2);
}

body {
  margin: 0;
  padding: 0;
  font-family: 'Courier New', Courier, monospace;
  background-color: var(--bg);
  background-image: 
    linear-gradient(var(--grid-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
  background-size: 40px 40px;
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

#app {
  width: 100%;
  max-width: 850px;
  min-height: 600px;
  padding: 2rem;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
}

.glass-panel {
  background: rgba(5, 5, 20, 0.95);
  border: 2px solid var(--neon-cyan);
  box-shadow: 0 0 15px var(--neon-cyan), inset 0 0 15px var(--neon-cyan);
  border-radius: 20px;
  padding: 3rem;
}

h1 {
  text-align: center;
  font-size: 3rem;
  margin-top: 0;
  margin-bottom: 2.5rem;
  color: var(--neon-pink);
  text-shadow: 0 0 5px var(--neon-pink), 0 0 20px var(--neon-pink);
  text-transform: uppercase;
  letter-spacing: 4px;
}

.level-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.level-card {
  background: #000;
  border: 2px solid var(--neon-pink);
  border-radius: 10px;
  padding: 2rem 1.5rem;
  cursor: pointer;
  text-align: center;
  box-shadow: 0 0 10px var(--neon-pink);
  transition: all 0.3s;
}

.level-card:hover {
  background: rgba(255, 0, 255, 0.15);
  box-shadow: 0 0 25px var(--neon-pink), inset 0 0 15px var(--neon-pink);
  transform: translateY(-5px);
}

.level-card h2 {
  margin: 0 0 0.75rem 0;
  font-size: 1.75rem;
  color: var(--neon-cyan);
  text-shadow: 0 0 10px var(--neon-cyan);
  text-transform: uppercase;
}

.level-card p {
  margin: 0;
  color: #ccc;
  font-size: 1.1rem;
}

.game-container {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.game-container h2 {
  color: var(--neon-yellow);
  text-shadow: 0 0 10px var(--neon-yellow);
  margin-top: 0;
  margin-bottom: 1rem;
}

.circle-container {
  position: relative;
  width: 500px;
  height: 500px;
  margin: 3rem auto;
}

.number-orb {
  position: absolute;
  width: 85px;
  height: 85px;
  background: #000;
  border: 2px solid var(--neon-cyan);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--neon-cyan), inset 0 0 5px var(--neon-cyan);
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 3rem;
  font-weight: bold;
  color: var(--neon-cyan);
  text-shadow: 0 0 5px var(--neon-cyan);
  transform: translate(-50%, -50%);
  transition: all 0.3s;
}

.number-orb.highlighted {
  border-color: var(--neon-yellow);
  color: var(--neon-yellow);
  box-shadow: 0 0 20px var(--neon-yellow), inset 0 0 10px var(--neon-yellow);
  text-shadow: 0 0 10px var(--neon-yellow);
  transform: translate(-50%, -50%) scale(1.2);
  z-index: 10;
}

.input-section {
  text-align: center;
  margin-top: 1rem;
  width: 100%;
}

.input-section p {
  font-size: 1.25rem;
  color: #fff;
  margin-bottom: 1.5rem;
}

.start-point-highlight {
  font-size: 3.5rem;
  font-weight: bold;
  color: var(--neon-yellow);
  text-shadow: 0 0 15px var(--neon-yellow), 0 0 30px var(--neon-yellow);
  display: block;
  margin-top: 0.5rem;
}

.sum-input {
  background: #000;
  border: 2px solid var(--neon-cyan);
  border-radius: 10px;
  padding: 1rem 1.5rem;
  color: var(--neon-cyan);
  font-size: 2rem;
  width: 240px;
  text-align: center;
  outline: none;
  font-family: inherit;
  font-weight: bold;
  box-shadow: 0 0 10px var(--neon-cyan);
}

.sum-input:focus {
  border-color: var(--neon-pink);
  color: var(--neon-pink);
  box-shadow: 0 0 25px var(--neon-pink);
}

.submit-btn, .action-btn {
  background: transparent;
  border: 2px solid var(--neon-pink);
  border-radius: 10px;
  color: var(--neon-pink);
  padding: 1.2rem 2.5rem;
  font-size: 1.1rem;
  font-weight: bold;
  cursor: pointer;
  margin-top: 2rem;
  font-family: inherit;
  text-transform: uppercase;
  box-shadow: 0 0 10px var(--neon-pink), inset 0 0 5px var(--neon-pink);
  text-shadow: 0 0 5px var(--neon-pink);
  transition: all 0.3s;
}

.submit-btn:hover, .action-btn:hover {
  background: var(--neon-pink);
  color: #000;
  box-shadow: 0 0 30px var(--neon-pink);
  text-shadow: none;
}

.action-btn.secondary {
  border-color: var(--neon-cyan);
  color: var(--neon-cyan);
  box-shadow: 0 0 10px var(--neon-cyan), inset 0 0 5px var(--neon-cyan);
  text-shadow: 0 0 5px var(--neon-cyan);
}

.action-btn.secondary:hover {
  background: var(--neon-cyan);
  color: #000;
  box-shadow: 0 0 30px var(--neon-cyan);
  text-shadow: none;
}

.actions-row {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
}

.summary-table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  background: #000;
  border: 2px solid var(--neon-cyan);
  box-shadow: 0 0 15px var(--neon-cyan);
  border-radius: 10px;
  overflow: hidden;
}

.summary-table th, .summary-table td {
  padding: 1.25rem 1rem;
  text-align: center;
  border-bottom: 1px solid rgba(0, 255, 255, 0.3);
}

.summary-table th {
  color: var(--neon-pink);
  text-shadow: 0 0 10px var(--neon-pink);
  text-transform: uppercase;
  font-weight: bold;
}

.text-success {
  color: #0f0;
  text-shadow: 0 0 10px #0f0;
}

.text-error {
  color: #f00;
  text-shadow: 0 0 10px #f00;
}

.summary-details {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.detail-item {
  flex: 1;
  background: rgba(0, 0, 0, 0.8);
  padding: 1.5rem;
  border: 2px solid var(--neon-cyan);
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  box-shadow: 0 0 10px var(--neon-cyan);
}

.detail-label {
  font-size: 0.9rem;
  color: var(--neon-cyan);
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  text-shadow: 0 0 5px var(--neon-cyan);
}

.detail-value {
  font-size: 1.5rem;
  color: #fff;
  text-align: center;
  word-break: break-all;
  text-shadow: 0 0 10px #fff;
}

@media screen and (max-width: 600px) {
  #app {
    padding: 1rem;
  }
  .glass-panel {
    padding: 1.5rem;
  }
  h1 {
    font-size: 2rem;
  }
  .circle-container {
    width: 250px;
    height: 250px;
    margin: 2rem auto;
  }
  .number-orb {
    width: 48px;
    height: 48px;
    font-size: 1.2rem;
  }
  .start-point-highlight {
    font-size: 2.5rem;
  }
  .sum-input {
    width: 100%;
    max-width: 200px;
  }
  .actions-row {
    flex-direction: column;
  }
  .action-btn {
    width: 100%;
  }
  .summary-details {
    flex-direction: column;
  }
}