body {
  font-family: Inter, system-ui, Arial, sans-serif;
  background: #0f172a;
  color: #e2e8f0;
  margin: 0;
}
.container {
  max-width: 760px;
  margin: 2rem auto;
  padding: 1rem;
}
.subtitle { color: #94a3b8; margin-top: -0.5rem; }
.card {
  background: #1e293b;
  border: 1px solid #334155;
  border-radius: 14px;
  padding: 1rem;
  margin-top: 1rem;
}
.time {
  font-size: 3rem;
  font-weight: 700;
  margin: 0.5rem 0;
}
.controls { display: flex; gap: 0.5rem; flex-wrap: wrap; }
button {
  background: #22c55e;
  color: #052e16;
  border: none;
  border-radius: 10px;
  padding: 0.55rem 0.8rem;
  font-weight: 600;
  cursor: pointer;
}
button:hover { filter: brightness(1.05); }
.mode { color: #93c5fd; }
form { display: flex; gap: 0.5rem; }
input {
  flex: 1;
  border-radius: 10px;
  border: 1px solid #475569;
  padding: 0.6rem;
  background: #0b1220;
  color: #e2e8f0;
}
ul { list-style: none; padding: 0; margin-top: 0.8rem; }
li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #0b1220;
  border: 1px solid #334155;
  border-radius: 10px;
  padding: 0.5rem 0.7rem;
  margin-bottom: 0.45rem;
}
li.done span { text-decoration: line-through; color: #94a3b8; }
.xbtn { background: #ef4444; color: #fff; }