:root {
  --bg: #f6f6f4; --card: #ffffff; --ink: #1b1b1a; --muted: #6b6b66; --line: #e2e2dd;
  --accent: #1f6f50; --accent-ink: #ffffff; --warn: #b3261e; --soft: #eef3f0;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #121312; --card: #1c1d1c; --ink: #ecece8; --muted: #9a9a94; --line: #2c2d2b; --accent: #5cc496; --accent-ink: #0d1a14; --warn: #ff8a80; --soft: #1f2a24; }
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.4 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
body { max-width: 640px; margin: 0 auto; padding: 12px 16px 48px; }
header { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; }
h1 { font-size: 20px; margin: 4px 0; }
.counts { color: var(--muted); font-size: 13px; }
nav { display: flex; gap: 6px; margin: 12px 0; }
nav button { flex: 1; position: relative; }
nav button[aria-pressed="true"] { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.badge:not(:empty) { margin-left: 4px; font-size: 12px; padding: 0 6px; border-radius: 9px; background: var(--warn); color: #fff; }
button, select, input[type=text], input[type=password] {
  font: inherit; color: var(--ink); background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 9px 12px; min-height: 42px;
}
button { cursor: pointer; }
button:disabled { opacity: .5; }
button.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
button.quiet { color: var(--muted); }
form.add { display: flex; gap: 6px; }
form.add input { flex: 1; min-width: 0; }
.msg { min-height: 20px; font-size: 14px; color: var(--accent); margin: 6px 2px; }
.msg.bad { color: var(--warn); }
ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.task { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 10px 12px; }
.task.overdue { border-left: 4px solid var(--warn); }
.task.must .title { font-weight: 700; }
.top { display: flex; gap: 8px; align-items: baseline; }
.id { color: var(--muted); font-size: 13px; }
.title { overflow-wrap: anywhere; }
.meta { color: var(--muted); font-size: 13px; margin-top: 2px; }
.notes { font-size: 13px; margin-top: 6px; white-space: pre-wrap; overflow-wrap: anywhere; background: var(--soft); border-radius: 8px; padding: 6px 8px; max-height: 8em; overflow: auto; }
.acts { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.acts button { padding: 6px 10px; min-height: 36px; font-size: 14px; }
.empty { color: var(--muted); text-align: center; padding: 24px 0; }
.login { max-width: 360px; margin: 18vh auto 0; display: grid; gap: 10px; }
.login p { color: var(--muted); margin: 0; }
footer { margin-top: 24px; text-align: center; }
footer form button { font-size: 13px; color: var(--muted); background: transparent; border: 0; }