:root {
  color-scheme: light dark;
  --bg: var(--tg-theme-bg-color, #ffffff);
  --text: var(--tg-theme-text-color, #111111);
  --hint: var(--tg-theme-hint-color, #999999);
  --link: var(--tg-theme-link-color, #2481cc);
  --button: var(--tg-theme-button-color, #2481cc);
  --button-text: var(--tg-theme-button-text-color, #ffffff);
  --secondary-bg: var(--tg-theme-secondary-bg-color, #f0f0f0);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}

#app {
  max-width: 480px;
  margin: 0 auto;
  padding: 16px 16px 96px;
}

.app-header h1 {
  font-size: 20px;
  margin: 8px 0 16px;
}

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

.tabs button {
  flex: 1;
  padding: 10px 8px;
  border: none;
  border-radius: 10px;
  background: var(--secondary-bg);
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

.tabs button.active {
  background: var(--button);
  color: var(--button-text);
}

.items {
  list-style: none;
  margin: 0;
  padding: 0;
}

.items li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 4px;
  border-bottom: 1px solid var(--secondary-bg);
}

.items li .check {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  border-radius: 50%;
  border: 2px solid var(--hint);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.items li.checked .check {
  background: var(--button);
  border-color: var(--button);
  color: var(--button-text);
}

.items li .text {
  flex: 1;
  font-size: 16px;
  word-break: break-word;
  cursor: pointer;
}

.items li.checked .text {
  text-decoration: line-through;
  color: var(--hint);
}

.items li .meta {
  font-size: 11px;
  color: var(--hint);
  display: block;
  margin-top: 2px;
}

.items li .delete {
  border: none;
  background: none;
  color: var(--hint);
  font-size: 18px;
  padding: 4px 8px;
  cursor: pointer;
}

.empty-hint {
  color: var(--hint);
  text-align: center;
  margin-top: 32px;
  font-size: 14px;
}

.add-form {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  gap: 8px;
  padding: 12px 16px calc(12px + env(safe-area-inset-bottom));
  background: var(--bg);
  border-top: 1px solid var(--secondary-bg);
  max-width: 480px;
  margin: 0 auto;
}

.add-form input {
  flex: 1;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--secondary-bg);
  background: var(--secondary-bg);
  color: var(--text);
  font-size: 16px;
}

.add-form button {
  width: 48px;
  border: none;
  border-radius: 10px;
  background: var(--button);
  color: var(--button-text);
  font-size: 22px;
  cursor: pointer;
}

.clear-btn {
  display: block;
  margin: 12px auto 0;
  background: none;
  border: none;
  color: var(--link);
  font-size: 14px;
  cursor: pointer;
}

.error {
  color: #e53935;
  text-align: center;
  margin-top: 16px;
  font-size: 14px;
}