body {
  margin: 0;
  font-family: 'Arial', sans-serif;
  background-color: #121212;
  color: #fff;
  display: flex;
  justify-content: center;
  padding: 1rem;
}
.container {
  width: 100%;
  max-width: 500px;
  padding: 1rem;
  background: #1e1e1e;
  border-radius: 1rem;
  box-shadow: 0 0 20px rgba(0,0,0,0.5);
}
h1 {
  text-align: center;
  margin-bottom: 1rem;
}
form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
input, select, button {
  padding: 0.75rem;
  border: none;
  border-radius: 0.5rem;
  font-size: 1rem;
}
input, select {
  background: #2c2c2c;
  color: #fff;
}
button {
  background: #00c853;
  color: #000;
  cursor: pointer;
  font-weight: bold;
}
button:hover {
  background: #00e676;
}
ul {
  list-style: none;
  padding: 0;
  margin-top: 1rem;
}
li {
  background: #2c2c2c;
  margin-bottom: 1rem;
  padding: 1rem;
  border-radius: 0.5rem;
  position: relative;
}
li iframe {
  width: 100%;
  height: 200px;
  margin-top: 0.5rem;
  border-radius: 0.5rem;
}
li .actions {
  margin-top: 0.5rem;
  display: flex;
  justify-content: space-between;
}
.cronometro {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.5rem;
  flex-wrap: wrap;
}
.cronometro button {
  flex: 1;
  background: #2979ff;
  color: white;
}
.cronometro span {
  font-weight: bold;
}
.filtros {
  margin: 1rem 0;
}
@media (max-width: 600px) {
  .container {
    padding: 0.75rem;
  }
  li iframe {
    height: 180px;
  }
}