:root {
  --bg: #f3f4f6;
  --card: #ffffff;
  --accent: #3b82f6;
  --text: #111827;
  --muted: #6b7280;
}
body {
  margin: 0;
  font-family: "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}
header {
  background: var(--accent);
  color: white;
  padding: 16px;
  text-align: center;
}
h1 { margin: 0; font-size: 20px; }
.container {
  max-width: 800px;
  margin: 20px auto;
  padding: 16px;
  background: var(--card);
  border-radius: 12px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}
.row {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}
input, select {
  flex: 1;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 8px;
}
button {
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 8px;
  padding: 10px 14px;
  cursor: pointer;
}
button:hover { background: #2563eb; }
.task {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #f9fafb;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  padding: 10px;
  margin-bottom: 8px;
}
.task.done span { text-decoration: line-through; color: var(--muted); }
.time { font-size: 13px; color: var(--muted); margin-left: 8px; }
footer {
  margin-top: 16px;
  text-align: center;
  font-size: 13px;
  color: var(--muted);
}