:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --line: #e3e6ea;
  --text: #1d2126;
  --muted: #6b737c;
  --accent: #2f6feb;
  --high: #d93b3b;
  --medium: #d98324;
  --low: #4a8f52;
  --done-bg: #e8f5e9;
  --error-bg: #fff3cd;
  --error-border: #ffc107;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 2rem 1rem 4rem;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

main { max-width: 720px; margin: 0 auto; }

h1 { margin: 0 0 .25rem; font-size: 1.6rem; }
h2 { margin: 0 0 1rem; font-size: 1.2rem; }

.sub { margin: 0 0 1.5rem; color: var(--muted); font-size: .875rem; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1rem;
  margin-bottom: 1.25rem;
}

.card.error {
  background: var(--error-bg);
  border-color: var(--error-border);
}

.user-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

#auth-section form {
  display: flex;
  flex-direction: column;
  gap: .75rem;
  max-width: 400px;
  margin: 0 auto;
}

#auth-section input {
  width: 100%;
}

form.add {
  display: grid;
  grid-template-columns: 1fr auto auto auto;
  gap: .5rem;
}

@media (max-width: 600px) {
  form.add { grid-template-columns: 1fr 1fr; }
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="date"],
select,
button {
  font: inherit;
  padding: .5rem .625rem;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #fff;
  color: var(--text);
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
input[type="date"]:focus,
select:focus {
  outline: 2px solid var(--accent);
  outline-offset: -1px;
  border-color: var(--accent);
}

button { cursor: pointer; }
button:hover { background: #f0f2f5; }
button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 600;
}
button.primary:hover { background: #2559c4; }
button.secondary { background: #e3e6ea; border-color: #e3e6ea; }
button.secondary:hover { background: #d0d3d7; }

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  align-items: center;
}

.toolbar .spacer { flex: 1; }
.toolbar label { color: var(--muted); font-size: .875rem; }

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

ul.tasks li {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .75rem .25rem;
  border-bottom: 1px solid var(--line);
}

ul.tasks li:last-child { border-bottom: 0; }
ul.tasks input[type="checkbox"] {
  width: 18px;
  height: 18px;
  flex: none;
  cursor: pointer;
}

.title {
  flex: 1;
  min-width: 0;
  word-break: break-word;
}

ul.tasks li.done { background: var(--done-bg); }
li.done .title {
  text-decoration: line-through;
  color: var(--muted);
}

.badge {
  flex: none;
  font-size: .75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .03em;
  padding: .125rem .5rem;
  border-radius: 999px;
  border: 1px solid currentColor;
}

.badge.high { color: var(--high); }
.badge.medium { color: var(--medium); }
.badge.low { color: var(--low); }

.due {
  flex: none;
  font-size: .8125rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.due.overdue {
  color: var(--high);
  font-weight: 600;
}

.due.today {
  color: var(--medium);
  font-weight: 600;
}

.del {
  flex: none;
  border: 0;
  background: transparent;
  color: var(--muted);
  font-size: 1.125rem;
  line-height: 1;
  padding: .25rem .5rem;
  border-radius: 6px;
}

.del:hover {
  background: #fdecec;
  color: var(--high);
}

.empty {
  color: var(--muted);
  text-align: center;
  padding: 1.5rem 0;
}

.note {
  font-size: .8125rem;
  color: var(--muted);
  text-align: center;
}

.note a {
  color: var(--accent);
  text-decoration: none;
}

.note a:hover {
  text-decoration: underline;
}

#status {
  min-height: 1.25rem;
  font-size: .8125rem;
  color: var(--muted);
}