* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: 'Segoe UI', sans-serif;
  background: linear-gradient(135deg, #667eea, #764ba2);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
}
.container {
  background: #fff;
  padding: 30px;
  border-radius: 16px;
  width: 100%;
  max-width: 500px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}
h1 { font-size: 1.4rem; margin-bottom: 20px; text-align: center; }
h2 { font-size: 1.1rem; margin: 25px 0 10px; }
form { display: flex; flex-direction: column; gap: 10px; }
input, button {
  padding: 12px;
  border-radius: 8px;
  border: 1px solid #ccc;
  font-size: 1rem;
}
button {
  background: #667eea;
  color: #fff;
  border: none;
  cursor: pointer;
  transition: 0.2s;
}
button:hover { background: #5563d6; }
ul { list-style: none; }
li {
  background: #f4f6ff;
  padding: 12px;
  margin-bottom: 8px;
  border-radius: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.9rem;
}
li.lewat { opacity: 0.5; text-decoration: line-through; }
li button {
  background: #ff5c5c;
  padding: 6px 10px;
  font-size: 0.8rem;
}
.info { margin-top: 20px; text-align: center; font-size: 0.85rem; color: #666; }