:root {
    color-scheme: light;
    --black: #222222;
    --dark-gray: #555555;
    --gray: #999999;
    --white: #f5f7fa;
    --green: #00b755;
    --yellow: #daaf38;
    --red: #ca4754;
}

* {
    box-sizing: border-box;
}

#app {
    opacity: 0;
    width: 100%;
    max-width: 500px;
    background: white;
    padding: 24px;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
}

body {
    font-family: Arial, Helvetica, sans-serif;
    background: var(--white);
    margin: 0;
    padding: 40px 20px;
    display: flex;
    justify-content: center;
}

h1 {
    color: var(--black);
}

#top-bar {
      display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

form {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

#task-form-input {
    flex: 1;
    padding: 8px 12px;
    border-radius: 8px;
    border: 1px solid #ddd;
    font-size: 14px;
}

input:focus {
  outline: none;
  border-color: var(--yellow);
}

input[type="checkbox"] {
  accent-color: var(--yellow);
  cursor: pointer;
}

button {
    margin-left: 1em;
    padding: 8px 12px;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    background: var(--black);
    color: var(--white);
    font-size: 14px;
    transition: background 0.2s ease;
}

button:hover {
    background: var(--dark-gray);
}

#counter {
    color: var(--dark-gray);
    font-size: small;
}

#filters button.active {
    margin-top: 1em;
    font-weight: bold;
    border: 3px solid var(--yellow);
}

ul {
    list-style-type: none;
}

li.completed span {
  text-decoration: line-through;
}

#task-list button {
    padding: 6px;
    margin: 0.5em 1em;
}

#clear-btn {
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s ease;
}

#clear-btn.visible {
  opacity: 1;
  pointer-events: auto;
}