:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --border: #e3e6ef;
  --text: #1d2233;
  --muted: #646b80;
  --accent: #4f46e5;
  --accent-soft: #eef0fe;
  --accent-dark: #3d36c4;
  --danger: #b3261e;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(23, 26, 45, .05), 0 8px 24px rgba(23, 26, 45, .06);
  font-size: 16px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.app-header {
  padding: 2rem 1.25rem 1rem;
  max-width: 62rem;
  margin: 0 auto;
}
.brand { display: flex; align-items: center; gap: .65rem; }
.brand-mark {
  width: 1.9rem; height: 1.9rem; border-radius: 8px; flex: none;
  background: linear-gradient(135deg, var(--accent), #8b7cf7);
  box-shadow: inset 0 0 0 3px rgba(255,255,255,.35);
}
h1 { font-size: 1.45rem; margin: 0; letter-spacing: -.02em; }
.tagline { margin: .15rem 0 0 2.55rem; color: var(--muted); font-size: .9rem; }

.layout {
  max-width: 62rem;
  margin: 0 auto;
  padding: .5rem 1.25rem 2rem;
  display: grid;
  grid-template-columns: 22rem 1fr;
  gap: 1.25rem;
  align-items: start;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
}
.panel h2 { margin: 0 0 1rem; font-size: 1.05rem; letter-spacing: -.01em; }

.field { display: flex; flex-direction: column; gap: .3rem; margin-bottom: .85rem; min-width: 0; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: .75rem; }
label { font-size: .82rem; font-weight: 600; color: var(--muted); }
.req { color: var(--danger); }
.opt { font-weight: 400; }

input, select, textarea {
  font: inherit;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: .55rem .65rem;
  width: 100%;
}
textarea { resize: vertical; }
input:focus-visible, select:focus-visible, textarea:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-color: var(--accent);
}
.field-error { margin: 0; color: var(--danger); font-size: .8rem; }

.btn {
  font: inherit; font-weight: 600;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: .55rem 1rem;
  cursor: pointer;
  transition: background .15s, border-color .15s;
}
.btn.primary { background: var(--accent); color: #fff; width: 100%; }
.btn.primary:hover { background: var(--accent-dark); }
.btn.ghost { background: transparent; color: var(--muted); border-color: var(--border); padding: .35rem .6rem; font-size: .82rem; }
.btn.ghost:hover { color: var(--text); border-color: var(--muted); }
.btn.ghost.danger:hover { color: var(--danger); border-color: var(--danger); }

.toolbar { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: .5rem; margin-bottom: .75rem; }
.counts { display: flex; gap: .9rem; font-size: .82rem; color: var(--muted); }
.count span { font-weight: 700; color: var(--text); font-variant-numeric: tabular-nums; }

.controls { display: flex; flex-wrap: wrap; gap: .75rem; margin-bottom: 1rem; }
.search-field { flex: 1 1 14rem; margin: 0; }
.filters { display: flex; gap: .5rem; }
.filters .field { margin: 0; min-width: 8.5rem; }

.task-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: .65rem; }

.task-item {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: .8rem .9rem;
  display: flex;
  gap: .75rem;
  align-items: flex-start;
  background: var(--surface);
}
.task-item.completed { background: #fafbfe; }
.task-item.completed .task-text .title { color: var(--muted); text-decoration: line-through; }

.task-toggle {
  width: 1.15rem; height: 1.15rem; margin-top: .2rem;
  accent-color: var(--accent);
  flex: none;
  cursor: pointer;
}

.task-text { flex: 1; min-width: 0; }
.task-text .title { font-weight: 600; overflow-wrap: anywhere; }
.task-text .notes { margin: .15rem 0 0; color: var(--muted); font-size: .88rem; white-space: pre-wrap; overflow-wrap: anywhere; }
.meta { display: flex; gap: .5rem; margin-top: .4rem; flex-wrap: wrap; }
.badge {
  font-size: .72rem; font-weight: 700; letter-spacing: .02em;
  padding: .1rem .5rem; border-radius: 999px;
}
.badge.low { background: #e9f6ef; color: #1c6b3c; }
.badge.medium { background: var(--accent-soft); color: var(--accent-dark); }
.badge.high { background: #fdeceb; color: var(--danger); }
.badge.due { background: #f1f2f7; color: var(--muted); font-weight: 600; }
.badge.due.overdue { background: #fdeceb; color: var(--danger); }

.task-actions { display: flex; gap: .4rem; flex: none; margin-top: .1rem; }

.edit-form { flex: 1; min-width: 0; }
.edit-form .field { margin-bottom: .6rem; }
.edit-actions { display: flex; gap: .5rem; }
.btn.small { padding: .35rem .8rem; font-size: .82rem; }

.empty-state { text-align: center; padding: 2.5rem 1rem; color: var(--muted); }
.empty-title { margin: 0; font-weight: 700; color: var(--text); font-size: 1.02rem; }
.empty-hint { margin: .3rem 0 0; font-size: .9rem; }

.app-footer { text-align: center; color: var(--muted); font-size: .8rem; padding: 0 1rem 2rem; }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

@media (max-width: 60rem) {
  .layout { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .app-header { padding-top: 1.25rem; }
  .field-row { grid-template-columns: 1fr; }
  .filters { flex: 1 1 100%; }
  .filters .field { flex: 1; min-width: 0; }
  .task-item { flex-wrap: wrap; }
  .task-actions { margin-left: auto; }
}