* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", sans-serif;
}

body {
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: radial-gradient(circle at top, #2a5298, #1e3c72);
  padding: 24px;
  color: #111;
}

.app {
  width: 100%;
  max-width: 560px;
  background: #ffffff;
  border-radius: 16px;
  box-shadow: 0 18px 45px rgba(0, 0, 0, 0.25);
  overflow: hidden;
}

.top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  padding: 22px 22px 14px;
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.title h1 {
  font-size: 28px;
  letter-spacing: 0.2px;
}

.sub {
  margin-top: 6px;
  color: #555;
  font-size: 14px;
}

.badge {
  display: grid;
  place-items: center;
  padding: 10px 14px;
  border-radius: 12px;
  background: rgba(0, 170, 255, 0.12);
  color: #006b9d;
  min-width: 82px;
}

.badge span {
  font-size: 20px;
  font-weight: 700;
  line-height: 1;
}

.badge small {
  font-size: 12px;
}

.add {
  padding: 16px 22px 18px;
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

#taskForm {
  display: flex;
  gap: 10px;
}

#taskInput {
  flex: 1;
  padding: 12px 12px;
  border: 1px solid rgba(0, 0, 0, 0.15);
  border-radius: 10px;
  outline: none;
  font-size: 15px;
}

#taskInput:focus {
  border-color: rgba(0, 170, 255, 0.65);
  box-shadow: 0 0 0 4px rgba(0, 170, 255, 0.12);
}

#addBtn {
  padding: 12px 16px;
  border: none;
  border-radius: 10px;
  background: #00aaff;
  color: white;
  cursor: pointer;
  font-weight: 700;
}

#addBtn:hover {
  opacity: 0.95;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 12px;
}

.chip {
  border: 1px solid rgba(0, 0, 0, 0.12);
  background: #fff;
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 13px;
  cursor: pointer;
}

.chip.active {
  border-color: rgba(0, 170, 255, 0.5);
  background: rgba(0, 170, 255, 0.12);
  color: #006b9d;
  font-weight: 700;
}

.chip.danger {
  border-color: rgba(255, 0, 0, 0.25);
  color: #a40000;
}

.list {
  padding: 16px 22px 10px;
}

#taskList {
  list-style: none;
  display: grid;
  gap: 10px;
}

.task {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 12px;
  border-radius: 12px;
  background: #f6f8fb;
  border: 1px solid rgba(0, 0, 0, 0.06);
}

.left {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.check {
  width: 18px;
  height: 18px;
  cursor: pointer;
}

.text {
  font-size: 15px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.task.done .text {
  text-decoration: line-through;
  opacity: 0.6;
}

.actions {
  display: flex;
  gap: 8px;
}

.iconBtn {
  border: none;
  background: transparent;
  cursor: pointer;
  padding: 6px 8px;
  border-radius: 8px;
}

.iconBtn:hover {
  background: rgba(0, 0, 0, 0.06);
}

.empty {
  margin-top: 14px;
  color: #666;
  font-size: 14px;
  text-align: center;
  display: none;
}

.foot {
  padding: 14px 22px 18px;
  text-align: center;
  color: #666;
  font-size: 13px;
  border-top: 1px solid rgba(0, 0, 0, 0.06);
}

@media (max-width: 520px) {
  .top {
    flex-direction: column;
    align-items: flex-start;
  }
  #taskForm {
    flex-direction: column;
  }
  #addBtn {
    width: 100%;
  }
}