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

body {
  font-family: Arial, sans-serif;
  min-height: 100vh;
  background: linear-gradient(135deg, #0f172a, #1e293b, #111827);
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
  color: white;
}

.container {
  width: 100%;
  max-width: 420px;
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 20px;
  padding: 28px;
  box-shadow: 0 10px 35px rgba(0, 0, 0, 0.35);
  text-align: center;
}

h1 {
  margin-bottom: 24px;
  font-size: 34px;
}

.topo {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
}

.topo input {
  flex: 1;
}

input {
  padding: 14px;
  border: none;
  border-radius: 12px;
  outline: none;
  font-size: 16px;
  background: #f8fafc;
  color: #111827;
}

button {
  padding: 14px 18px;
  border: none;
  border-radius: 12px;
  background: #22c55e;
  color: white;
  font-weight: bold;
  cursor: pointer;
  transition: 0.2s;
}

button:hover {
  transform: scale(1.03);
  opacity: 0.95;
}

#lista {
  list-style: none;
  margin-top: 10px;
  text-align: left;
}

#lista li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  background: rgba(255, 255, 255, 0.08);
  padding: 14px 16px;
  border-radius: 12px;
  margin-bottom: 12px;
  font-size: 16px;
  transition: 0.2s;
}

#lista li:hover {
  transform: translateY(-2px);
}

.concluida {
  text-decoration: line-through;
  opacity: 0.6;
}

#lista li button {
  background: #ef4444;
  color: white;
  padding: 8px 12px;
  border-radius: 10px;
  font-size: 14px;
}