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

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f4f4f4;
  line-height: 1.6;
}

header {
  background: #35424a;
  color: #ffffff;
  padding: 20px 0;
  text-align: center;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

h1 {
  margin: 0;
  font-size: 2rem;
}

main {
  max-width: 1200px;
  margin: 20px auto;
  padding: 0 20px;
}

#upload-section {
  margin: 20px 0;
  padding: 30px;
  background: #ffffff;
  border-radius: 8px;
  box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
  text-align: center;
}

#upload-section h2 {
  margin-bottom: 20px;
  color: #35424a;
}

#file-input {
  display: block;
  margin: 20px auto;
  padding: 10px;
  font-size: 16px;
}

#upload-button {
  display: inline-block;
  padding: 12px 30px;
  background: #5cb85c;
  color: #ffffff;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-size: 16px;
  transition: background 0.3s ease;
}

#upload-button:hover {
  background: #4cae4c;
}

#upload-button:active {
  transform: scale(0.98);
}

#file-status {
  margin-top: 15px;
  color: #666;
  font-style: italic;
}

#reader-section {
  margin: 20px 0;
  padding: 20px;
  background: #ffffff;
  border-radius: 8px;
  box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
}

#controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  padding: 15px;
  background: #f8f9fa;
  border-radius: 5px;
}

#controls button {
  padding: 10px 20px;
  background: #35424a;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-size: 14px;
  transition: background 0.3s ease;
}

#controls button:hover {
  background: #4a5660;
}

#controls button:disabled {
  background: #ccc;
  cursor: not-allowed;
}

#page-info {
  font-weight: bold;
  color: #35424a;
}

#book-content {
  min-height: 400px;
  padding: 20px;
  background: #fff;
  border-radius: 5px;
  overflow-x: auto;
}

/* Estilos para EPUB */
#book-content iframe {
  width: 100%;
  height: 600px;
  border: none;
}

/* Estilos para PDF */
#book-content canvas {
  display: block;
  margin: 10px auto;
  max-width: 100%;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

/* Responsividade */
@media (max-width: 768px) {
  main {
    padding: 0 10px;
  }

  h1 {
    font-size: 1.5rem;
  }

  #controls {
    flex-direction: column;
    gap: 10px;
  }

  #controls button {
    width: 100%;
  }
}