:root {
  --bg: #f2f2f2;
  --text: #222;
  --card: #fff;
  --accent: #007bff;
  --border: #ccc;
}

body.dark {
  --bg: #181818;
  --text: #f9f9f9;
  --card: #222;
  --accent: #0d6efd;
  --border: #444;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, sans-serif;
  display: flex;
  justify-content: center;
  padding: 50px 20px;
  transition: 0.3s;
}

.app {
  width: 420px;
  background: var(--card);
  padding: 25px;
  border-radius: 16px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 25px;
}

header h1 {
  font-size: 24px;
  font-weight: 600;
}

#theme-toggle {
  background: none;
  border: none;
  font-size: 22px;
  cursor: pointer;
  transition: transform 0.2s;
}

#theme-toggle:hover {
  transform: rotate(20deg);
}

.controls {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

input[type="text"] {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card);
  color: var(--text);
  outline: none;
}

#search {
  background: #e9ecef;
  border-color: #bbb;
  padding-left: 36px; /* место для иконки */
  position: relative;
  background-image: url("data:image/svg+xml,%3Csvg fill='%23666' xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M21 20l-5.6-5.6a7.5 7.5 0 10-1.4 1.4L20 21zM4 10a6 6 0 1112 0A6 6 0 014 10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: 10px center;
  background-size: 18px;
  transition:
    background 0.3s,
    border 0.3s;
  color: black;
  margin-bottom: 6redpx; /* отделяем визуально от формы */
}

#search:focus {
  background-color: #f8f9fa;
  border-color: var(--accent);
}

/* форма добавления */
#todo-form {
  display: flex;
  gap: 8px;
}

#todo-form input {
  flex-grow: 1;
}

#todo-form button {
  flex-shrink: 0;
}

button {
  padding: 10px 15px;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  transition: 0.2s;
}

button:hover {
  opacity: 0.9;
}

.filters {
  display: flex;
  justify-content: space-between;
}

.filters button {
  flex: 1;
  margin: 0 3px;
  background: #ccc;
  color: #000;
}

.filters button.active {
  background: var(--accent);
  color: #fff;
}

ul {
  list-style: none;
  margin-top: 25px;
  padding: 0;
}

li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  margin-bottom: 10px;
  transition: background 0.2s;
}

li.completed {
  background: rgba(0, 128, 0, 0.08);
}

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

li span {
  flex: 1;
  margin-left: 10px;
  word-break: break-word;
}

li input[type="checkbox"] {
  transform: scale(1.2);
  cursor: pointer;
  margin: 0;
  margin-top: 5px;
}

li button {
  background: #e74c3c;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  font-size: 21px;
}