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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #0f172a;
  color: #e2e8f0;
  min-height: 100vh;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

header {
  text-align: center;
  margin-bottom: 2rem;
}

header h1 {
  font-size: 2.5rem;
  color: #38bdf8;
  letter-spacing: 2px;
}

.subtitle {
  color: #94a3b8;
  margin-top: 0.5rem;
}

section {
  background: #1e293b;
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

section h2 {
  font-size: 1.1rem;
  color: #38bdf8;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid #334155;
}

.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.3rem;
  color: #94a3b8;
  font-size: 0.9rem;
}

.form-group input {
  width: 100%;
  padding: 0.6rem 1rem;
  background: #0f172a;
  border: 1px solid #334155;
  border-radius: 8px;
  color: #e2e8f0;
  font-size: 1rem;
}

.form-group input:focus {
  outline: none;
  border-color: #38bdf8;
}

.portas-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.8rem;
}

.porta-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
  padding: 1.2rem 0.5rem;
  background: #0f172a;
  border: 2px solid #334155;
  border-radius: 12px;
  color: #e2e8f0;
  cursor: pointer;
  transition: all 0.2s;
}

.porta-btn:hover {
  border-color: #38bdf8;
  background: #1a2744;
}

.porta-btn:active {
  transform: scale(0.95);
}

.porta-btn.ativa {
  border-color: #22c55e;
  background: #14532d33;
}

.porta-num {
  font-size: 1.8rem;
  font-weight: bold;
  color: #38bdf8;
}

.porta-label {
  font-size: 0.75rem;
  color: #94a3b8;
}

.log-container {
  background: #0f172a;
  border-radius: 8px;
  padding: 1rem;
  max-height: 300px;
  overflow-y: auto;
  font-family: 'Courier New', monospace;
  font-size: 0.85rem;
  line-height: 1.6;
}

.log-entry {
  padding: 0.2rem 0;
  border-bottom: 1px solid #1e293b;
}

.log-entry .timestamp {
  color: #64748b;
  margin-right: 0.5rem;
}

.log-entry.success { color: #22c55e; }
.log-entry.error { color: #ef4444; }
.log-entry.info { color: #38bdf8; }

#qrCodeContainer {
  text-align: center;
  padding: 1rem;
}

#qrCodeContainer img {
  max-width: 250px;
  border-radius: 8px;
  background: white;
  padding: 1rem;
}

#pagamentoInfo {
  text-align: center;
  margin-top: 1rem;
  color: #94a3b8;
}

@media (max-width: 600px) {
  .portas-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}