body {
  font-family: "Segoe UI", sans-serif;
  background: #f4f6fa;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  min-height: 100vh;
}

#timer {
  font-size: clamp(32px, 12vw, 56px);
  color: #ff6347;
  margin: 20px 0;
}

button {
  font-size: 1rem;
  padding: 10px 20px;
  margin: 5px;
  border: none;
  border-radius: 10px;
  cursor: pointer;
}

#controls {
  margin-top: 20px;
}

button:disabled {
  opacity: 0.5;
  cursor: default;
}

.container {
  margin-top: 40px;
  background: white;
  border-radius: 20px;
  padding: 20px;
  width: 100%;
  max-width: 400px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
  text-align: center;
  box-sizing: border-box;
}

#progressContainer {
  width: 100%;
  height: 10px;
  background-color: #eee;
  border-radius: 5px;
  margin: 20px 0;
  overflow: hidden;
}

#progressBar {
  height: 100%;
  width: 0%;
  background-color: #00bfff;
  transition: width 1s linear;
}

#stats {
  margin-top: 30px;
  font-size: 14px;
  color: #555;
}

#settings {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px 15px;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  max-width: 300px;
  margin-left: auto;
  margin-right: auto;
}

#settings label {
  display: block;
  margin-bottom: 10px;
}

#settings input {
  width: 60px;
  padding: 4px;
  margin-left: 10px;
}

#resetSettingsBtn {
  margin-top: 10px;
  padding: 6px 12px;
}

#notification {
  margin-top: 20px;
  padding: 10px;
  background-color: #ffeb3b;
  color: #000;
  font-weight: bold;
  border-radius: 8px;
  display: none;
}

#notification.show {
  display: block;
}

body.dark {
  background-color: #121212;
  color: #eee;
}

body.dark .container {
  background-color: #1e1e1e;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

body.dark #timer {
  color: #ff8a65;
}

body.dark button {
  background-color: #333;
  color: #fff;
}

body.dark input {
  background-color: #222;
  color: #fff;
  border: 1px solid #555;
}

#themeToggle {
  margin-top: 20px;
  font-size: 14px;
}

@media (max-width: 480px) {
  #settings label,
  #stats p {
    font-size: 13px;
  }

  #timer {
    font-size: 18vw;
  }

  input {
    width: 50px;
  }

  button {
    padding: 10px 14px;
    font-size: 14px;
  }
}

@media (max-width: 600px) {
  #container {
    margin-top: 20px;
  }
}

@media (min-width: 601px) {
  #container {
    margin-top: 60px;
  }
}