:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #f0f2f5;
  --text: #16202a;
  --muted: #667085;
  --line: #e4e7ec;
  --accent: #0f766e;
  --accent-ink: #ffffff;
  --accent-soft: #ccfbf1;
  --danger: #b42318;
  --danger-soft: #fee4e2;
  --warn: #b54708;
  --warn-soft: #fef0c7;
  --ok: #067647;
  --ok-soft: #dcfae6;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 1px 3px rgba(16, 24, 40, .08);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1418;
    --surface: #161e24;
    --surface-2: #1d272e;
    --text: #e8edf1;
    --muted: #93a1ad;
    --line: #26323a;
    --accent: #2dd4bf;
    --accent-ink: #04201d;
    --accent-soft: #123a37;
    --danger: #fda29b;
    --danger-soft: #3a1714;
    --warn: #fec84b;
    --warn-soft: #3a2a0c;
    --ok: #75e0a7;
    --ok-soft: #0f2e1e;
    --shadow: none;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--text); }
body {
  font: 15px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-tap-highlight-color: transparent;
  padding-bottom: env(safe-area-inset-bottom);
}
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
.splash { padding: 4rem 1rem; text-align: center; color: var(--muted); }

/* Layout */
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 16px; }
.topbar {
  position: sticky; top: 0; z-index: 20;
  background: var(--surface); border-bottom: 1px solid var(--line);
  padding-top: env(safe-area-inset-top);
}
.topbar .wrap { display: flex; align-items: center; gap: 12px; height: 56px; }
.brand { font-weight: 700; font-size: 17px; letter-spacing: -.01em; display: flex; align-items: center; gap: 8px; }
.brand i { width: 22px; height: 22px; border-radius: 6px; background: var(--accent); display: inline-block; position: relative; }
.brand i::after { content: ""; position: absolute; left: 6px; top: 4px; width: 5px; height: 10px; border: solid var(--accent-ink); border-width: 0 2px 2px 0; transform: rotate(40deg); }
.spacer { flex: 1; }
.tabs { display: flex; gap: 4px; }
.tab { border: 0; background: transparent; padding: 8px 12px; border-radius: 8px; color: var(--muted); font-weight: 600; }
.tab[aria-current="true"] { background: var(--accent-soft); color: var(--accent); }
.me { display: flex; align-items: center; gap: 8px; border: 0; background: transparent; padding: 4px; border-radius: 999px; }
main { padding: 16px 0 96px; }

/* Stats */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-bottom: 16px; }
.stat { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 10px 12px; box-shadow: var(--shadow); }
.stat b { display: block; font-size: 22px; line-height: 1.1; }
.stat span { color: var(--muted); font-size: 12px; }
.stat.bad b { color: var(--danger); }
.stat.warn b { color: var(--warn); }
.stat.good b { color: var(--ok); }

/* Quick add */
.quick { display: flex; gap: 8px; margin-bottom: 16px; }
.quick input { flex: 1; min-width: 0; padding: 12px 14px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.btn { border: 1px solid var(--line); background: var(--surface); padding: 10px 14px; border-radius: 10px; font-weight: 600; }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn.danger { color: var(--danger); }
.btn.ghost { background: transparent; border-color: transparent; color: var(--muted); }
.btn:disabled { opacity: .5; cursor: default; }

/* Sections and cards */
.group { margin-bottom: 20px; }
.group h3 { margin: 0 0 8px; font-size: 12px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); display: flex; align-items: center; gap: 8px; }
.group h3 .n { background: var(--surface-2); border-radius: 999px; padding: 1px 8px; font-size: 11px; }
.group.overdue h3 { color: var(--danger); }
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 10px 12px; margin-bottom: 8px; box-shadow: var(--shadow);
  display: flex; gap: 10px; align-items: flex-start; cursor: pointer;
}
.card:active { background: var(--surface-2); }
.check {
  flex: none; width: 22px; height: 22px; border-radius: 50%; border: 2px solid var(--line);
  background: transparent; margin-top: 1px; padding: 0; display: grid; place-items: center;
}
.check:hover { border-color: var(--accent); }
.card.done .check { background: var(--accent); border-color: var(--accent); }
.card.done .check::after { content: ""; width: 5px; height: 10px; border: solid var(--accent-ink); border-width: 0 2px 2px 0; transform: rotate(40deg) translate(-1px, -1px); }
.card.done .t { text-decoration: line-through; color: var(--muted); }
.card .body { flex: 1; min-width: 0; }
.card .t { font-weight: 600; word-break: break-word; }
.meta { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 6px; align-items: center; }
.chip { font-size: 12px; padding: 2px 8px; border-radius: 999px; background: var(--surface-2); color: var(--muted); white-space: nowrap; }
.chip.high { background: var(--danger-soft); color: var(--danger); }
.chip.medium { background: var(--warn-soft); color: var(--warn); }
.chip.low { background: var(--surface-2); color: var(--muted); }
.chip.overdue { background: var(--danger-soft); color: var(--danger); font-weight: 600; }
.chip.today { background: var(--warn-soft); color: var(--warn); font-weight: 600; }
.chip.doing { background: var(--accent-soft); color: var(--accent); }
.avatar { flex: none; width: 24px; height: 24px; border-radius: 50%; display: grid; place-items: center; font-size: 11px; font-weight: 700; color: #fff; }
.avatar.lg { width: 30px; height: 30px; font-size: 12px; }
.empty { text-align: center; color: var(--muted); padding: 32px 16px; border: 1px dashed var(--line); border-radius: var(--radius); }

/* Board */
.toolbar { display: flex; gap: 8px; align-items: center; margin-bottom: 12px; flex-wrap: wrap; }
.toolbar select { padding: 8px 10px; border-radius: 10px; border: 1px solid var(--line); background: var(--surface); }
.board { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; align-items: start; }
.col { background: var(--surface-2); border-radius: var(--radius); padding: 10px; min-height: 120px; }
.col h3 { margin: 2px 4px 10px; font-size: 13px; display: flex; justify-content: space-between; }
.col .card { box-shadow: none; }
.col.dragover { outline: 2px dashed var(--accent); }
@media (max-width: 760px) {
  .board { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .tabs .tab { padding: 8px 10px; }
  .brand span { display: none; }
}

/* FAB */
.fab {
  position: fixed; right: 18px; bottom: calc(18px + env(safe-area-inset-bottom));
  width: 56px; height: 56px; border-radius: 50%; border: 0; z-index: 15;
  background: var(--accent); color: var(--accent-ink); font-size: 30px; line-height: 1;
  box-shadow: 0 6px 18px rgba(0, 0, 0, .25);
}

/* Modal */
.overlay { position: fixed; inset: 0; background: rgba(8, 15, 20, .55); z-index: 40; display: flex; align-items: flex-end; justify-content: center; }
.sheet {
  background: var(--surface); width: 100%; max-width: 560px; max-height: 92vh; overflow: auto;
  border-radius: 18px 18px 0 0; padding: 16px 16px calc(16px + env(safe-area-inset-bottom));
}
@media (min-width: 700px) { .overlay { align-items: center; } .sheet { border-radius: 18px; } }
.sheet h2 { margin: 0 0 12px; font-size: 18px; }
.field { margin-bottom: 12px; }
.field label { display: block; font-size: 12px; font-weight: 600; color: var(--muted); margin-bottom: 4px; }
.field input, .field select, .field textarea {
  width: 100%; padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface);
}
.field textarea { min-height: 84px; resize: vertical; }
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.actions { display: flex; gap: 8px; margin-top: 8px; }
.actions .spacer { flex: 1; }
.comments { margin-top: 16px; border-top: 1px solid var(--line); padding-top: 12px; }
.comments h4 { margin: 0 0 8px; font-size: 13px; }
.cm { display: flex; gap: 8px; margin-bottom: 10px; }
.cm .bubble { background: var(--surface-2); border-radius: 10px; padding: 6px 10px; flex: 1; word-break: break-word; white-space: pre-wrap; }
.cm small { color: var(--muted); display: block; margin-bottom: 2px; }
.cm-add { display: flex; gap: 8px; }
.cm-add input { flex: 1; min-width: 0; padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); }
.hint { color: var(--muted); font-size: 12px; margin-top: 6px; }

/* Auth */
.auth { max-width: 380px; margin: 0 auto; padding: 56px 16px; }
.auth h1 { font-size: 26px; margin: 0 0 4px; letter-spacing: -.02em; }
.auth p { color: var(--muted); margin: 0 0 20px; }
.auth .btn.primary { width: 100%; padding: 12px; }
.auth .switch { text-align: center; margin-top: 14px; color: var(--muted); }
.auth .switch button { border: 0; background: none; color: var(--accent); font-weight: 600; padding: 0; }
.err { background: var(--danger-soft); color: var(--danger); padding: 8px 12px; border-radius: 10px; margin-bottom: 12px; font-size: 13px; }
.setup { max-width: 560px; margin: 40px auto; padding: 0 16px; }
.setup code { background: var(--surface-2); padding: 1px 6px; border-radius: 6px; }

/* Toast + offline */
#toast { position: fixed; left: 50%; bottom: calc(86px + env(safe-area-inset-bottom)); transform: translateX(-50%); z-index: 60; pointer-events: none; }
#toast div { background: var(--text); color: var(--bg); padding: 10px 16px; border-radius: 999px; font-weight: 600; box-shadow: 0 6px 18px rgba(0,0,0,.25); margin-top: 6px; }
.offline { background: var(--warn-soft); color: var(--warn); text-align: center; padding: 6px; font-size: 13px; font-weight: 600; }