body {
  margin: 0;
  font-family: "Poppins", sans-serif;
  background-color: #0f0f0f;
  color: whitesmoke;
}

video {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: -1;
  transition: opacity 0.5s;
}
.overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.13);
  z-index: -1;
}
header {
  background-color: rgba(0, 0, 0, 0.151);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
  padding: 9px;
}

header img {
  width: 120px;
}
header ul {
  margin-top: 50px;
  display: flex;
  gap: 80px;
  list-style: none;
  font-size: 20px;
  text-align: center;
  margin-left: auto;
  margin-right: 150px;
}
/* -----------------ul anmtion --------------------*/
nav a {
  text-decoration: none;
  color: white;
  transition: 0.6s;
  display: inline-block;
  position: relative;
}

nav a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: rgba(255, 115, 0, 0.8);
  text-shadow: 0 0 10px rgba(255, 115, 0, 0.8);
  transition: 0.6s;
}

nav a:hover::after {
  transition: 0.6s;
  width: 100%;
  left: 0;
}

nav a:hover {
  transform: scale(1.2);
  text-shadow: 0 0 10px rgba(255, 115, 0, 0.8);
}
/* ---- timer box ---- */
#timerbox {
  background: rgba(120, 70, 0, 0.28);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 200, 100, 0.2);
  color: white;
  border-radius: 16px;
  padding: 40px 36px;
  margin: 6% auto;
  width: 560px;
  max-width: 90%;
  text-align: center;
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.35);
}

#timerbox h1 {
  margin-top: 0;
  font-size: 28px;
  color: #ffe8b0;
  text-shadow: 0 0 12px rgba(255, 160, 0, 0.4);
  margin-bottom: 20px;
}

h2 {
  font-size: 72px;
  margin: 10px 0 20px;
  color: #fff;
  text-shadow: 0 0 20px rgba(255, 180, 0, 0.5);
  letter-spacing: 4px;
}

#sesstion ul {
  display: flex;
  justify-content: center;
  list-style: none;
  gap: 12px;
  padding: 0;
  margin: 0 0 20px;
}

#sesstion ul button {
  width: 120px;
  height: 40px;
  font-size: 14px;
  font-family: "Poppins", sans-serif;
  background: rgba(255, 255, 255, 0.07);
  color: white;
  border: 1px solid rgba(255, 200, 100, 0.25);
  border-radius: 20px;
  cursor: pointer;
  transition: 0.3s;
}

#sesstion ul button:hover {
  background: rgba(255, 160, 0, 0.25);
  border-color: rgba(255, 160, 0, 0.6);
}

#sesstion ul button.active {
  background: rgba(210, 130, 0, 0.75);
  border-color: transparent;
  box-shadow: 0 0 12px rgba(255, 160, 0, 0.4);
}

#startbtn,
#pausebtn,
#resetbtn {
  width: 100px;
  height: 40px;
  font-size: 15px;
  font-family: "Poppins", sans-serif;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: 0.3s;
  margin: 6px;
}

#startbtn {
  background: rgba(210, 130, 0, 0.8);
  color: white;
}

#startbtn:hover {
  background: rgba(255, 160, 0, 0.95);
  transform: scale(1.05);
}

#pausebtn {
  background: rgba(255, 255, 255, 0.1);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

#pausebtn:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: scale(1.05);
}

#resetbtn {
  background: rgba(180, 50, 50, 0.5);
  color: white;
}

#resetbtn:hover {
  background: rgba(220, 60, 60, 0.8);
  transform: scale(1.05);
}

#starcount {
  font-size: 22px;
  margin-top: 12px;
  letter-spacing: 4px;
}

#ToDoList {
  list-style: none;
  padding: 10px 0;
  margin: 16px 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
  text-align: center;
}

#ToDoList li {
  align-items: center;
  gap: 10px;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 200, 100, 0.15);
  border-radius: 10px;
  padding: 10px 14px;
  transition: 0.3s;
  cursor: pointer;
}
#ToDoList li.checked::before {
  content: "✓";
  color: orange;
  font-weight: bold;
  margin-right: 6px;
}
#ToDoList li.checked {
  background: rgba(255, 200, 100, 0.15);
  border-color: rgba(255, 200, 100, 0.4);
  opacity: 0.7;
}
#ToDoList li:hover {
  background: rgba(255, 200, 100, 0.1);
  border-color: rgba(255, 200, 100, 0.3);
}

#ToDoList li span {
  font-size: 15px;
  color: #fff;
}