:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --text: #1d2330;
  --muted: #6b7280;
  --border: #e3e6eb;
  --accent: #3b5bdb;
  --accent-text: #ffffff;
  --danger: #c92a2a;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161b;
    --card: #1e2128;
    --text: #e6e8ec;
    --muted: #9aa1ad;
    --border: #2f333c;
    --accent: #6c8cff;
    --accent-text: #0d1020;
    --danger: #ff6b6b;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  padding: 40px 16px;
}
[hidden] { display: none !important; }

.card {
  max-width: 560px;
  margin: 0 auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
}
header { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 20px; }
h1 { margin: 0; font-size: 1.6rem; }
#userbar { color: var(--muted); font-size: .9rem; display: flex; gap: 10px; align-items: center; }

button { font: inherit; cursor: pointer; }
button.primary {
  background: var(--accent); color: var(--accent-text);
  border: 0; border-radius: 8px; padding: 10px 16px; font-weight: 600;
}
button.link { background: none; border: 0; color: var(--accent); padding: 0; }

input[type=text], input[type=email], input[type=password] {
  width: 100%; font: inherit; color: var(--text); background: var(--bg);
  border: 1px solid var(--border); border-radius: 8px; padding: 10px 12px;
}
input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }

.tabs { display: flex; gap: 4px; margin-bottom: 16px; border-bottom: 1px solid var(--border); }
.tab { background: none; border: 0; padding: 8px 12px; color: var(--muted); border-bottom: 2px solid transparent; margin-bottom: -1px; }
.tab.active { color: var(--text); border-bottom-color: var(--accent); font-weight: 600; }

#auth-form { display: grid; gap: 14px; }
#auth-form label { display: grid; gap: 6px; font-size: .9rem; color: var(--muted); }
.error { color: var(--danger); margin: 0; font-size: .9rem; }
.muted { color: var(--muted); text-align: center; }

#add-form { display: flex; gap: 8px; }
#add-form input { flex: 1; }

.filters { display: flex; gap: 6px; align-items: center; margin: 16px 0 8px; }
.filter { background: none; border: 1px solid transparent; border-radius: 6px; padding: 4px 10px; color: var(--muted); font-size: .9rem; }
.filter.active { border-color: var(--border); color: var(--text); }
#count { margin-left: auto; color: var(--muted); font-size: .9rem; }

#list { list-style: none; margin: 0; padding: 0; }
#list li {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 4px; border-bottom: 1px solid var(--border);
}
#list li:last-child { border-bottom: 0; }
#list input[type=checkbox] { width: 18px; height: 18px; accent-color: var(--accent); flex-shrink: 0; }
#list .title { flex: 1; word-break: break-word; }
#list li.done .title { text-decoration: line-through; color: var(--muted); }
#list .delete { background: none; border: 0; color: var(--muted); font-size: 1.2rem; line-height: 1; padding: 4px 8px; border-radius: 6px; }
#list .delete:hover { color: var(--danger); }
#list .edit-input { flex: 1; }