body {
  font-family: "Segoe UI", "Microsoft JhengHei", Arial, sans-serif;
  background: #fafbfc;
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

h1 {
  font-size: 2.2rem;
  margin-bottom: 16px;
  color: #d35400;
}

.timer {
  font-size: 4rem;
  font-weight: bold;
  margin: 28px 0 16px 0;
  letter-spacing: 2px;
}

.buttons {
  display: flex;
  gap: 18px;
  margin-bottom: 16px;
}

button {
  font-size: 1.25rem;
  padding: 12px 32px;
  border: none;
  border-radius: 8px;
  background: #ffa726;
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}
button:hover {
  background: #fb8c00;
}

.mode-toggle {
  margin-bottom: 32px;
  font-size: 1.1rem;
}
.mode-toggle label {
  margin-right: 18px;
}

footer {
  text-align: center;
  padding: 18px 0;
  background: #fff3e0;
  border-top: 1px solid #ffe0b2;
  font-size: 1.05rem;
  letter-spacing: 2px;
}

@media (max-width: 600px) {
  .container {
    padding: 10px;
  }
  .timer {
    font-size: 3rem;
  }
  button {
    font-size: 1rem;
    padding: 10px 20px;
  }
}