body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  background: linear-gradient(135deg, #1f1c2c, #928dab);
  color: white;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.logo {
  font-size: 1.6em;
  font-weight: bold;
}
.logo span {
  color: white;
}

nav .voltar {
  background: #00ffc8;
  color: #1a1a1a;
  padding: 10px 15px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: bold;
  transition: background 0.3s;
}
nav .voltar:hover {
  background: #00dab2;
}

main.container {
  flex: 1;
  padding: 40px 20px;
  max-width: 800px;
  margin: auto;
  text-align: center;
}

main h1 {
  font-size: 2em;
  margin-bottom: 30px;
  color: #00ffc8;
}

.cronometro {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 25px;
}

#tempo {
  font-size: 3em;
  font-weight: bold;
  background: rgba(255, 255, 255, 0.05);
  padding: 20px 40px;
  border-radius: 16px;
  border: 2px solid #00ffc8;
  box-shadow: 0 0 20px #00ffc844;
}

.botoes {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  justify-content: center;
}

button {
  padding: 12px 20px;
  background: #00ffc8;
  color: #1a1a1a;
  border: none;
  border-radius: 8px;
  font-size: 1em;
  font-weight: bold;
  cursor: pointer;
  transition: background 0.3s;
}
button:hover {
  background: #00dab2;
}

footer {
  text-align: center;
  padding: 20px;
  font-size: 0.9em;
  background: rgba(0, 0, 0, 0.4);
}