:root {
  --bg:#f3f4f8; --card:#fff; --text:#1b1f2a; --sub:#6b7280; --line:#e6e8ee;
  --accent:#4f46e5; --accent-soft:#eef0ff; --red:#e11d48; --red-soft:#ffe9ee; --green:#16a34a;
  --shadow:0 1px 2px rgba(20,24,40,.06), 0 4px 14px rgba(20,24,40,.05);
}
@media (prefers-color-scheme: dark) {
  :root { --bg:#0e1015; --card:#181b23; --text:#eceef4; --sub:#9aa3b2; --line:#272c38;
    --accent:#818cf8; --accent-soft:#232743; --red:#fb7185; --red-soft:#3a1a24; --shadow:none; }
}
* { box-sizing:border-box; -webkit-tap-highlight-color:transparent; }
body { margin:0; background:var(--bg); color:var(--text); min-height:100dvh;
  font:16px/1.45 system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  padding-bottom:calc(128px + env(safe-area-inset-bottom)); }
button { font:inherit; cursor:pointer; border:0; color:inherit; background:none; }
input, textarea, select { font:inherit; color:var(--text); }

header { position:sticky; top:0; z-index:5; padding:calc(14px + env(safe-area-inset-top)) 16px 10px;
  background:color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter:blur(10px); }
.top, .seg, main { max-width:640px; margin-inline:auto; }
h1 { margin:0; font-size:26px; letter-spacing:.5px; }
#sub { margin:2px 0 10px; color:var(--sub); font-size:14px; }
.seg { display:grid; grid-template-columns:1fr 1fr; background:var(--line); border-radius:12px; padding:3px; }
.seg button { padding:8px; border-radius:10px; color:var(--sub); font-size:15px; }
.seg button.on { background:var(--card); color:var(--text); box-shadow:var(--shadow); font-weight:600; }
.seg b { font-weight:600; color:var(--accent); margin-left:2px; }

main { padding:4px 16px; }
.group { margin-top:14px; }
.group h3 { margin:0 4px 8px; font-size:13px; font-weight:600; color:var(--sub); display:flex; gap:6px; align-items:center; }
.group.late h3 { color:var(--red); }
.group h3 i { font-style:normal; background:var(--line); color:var(--sub); border-radius:10px; padding:0 7px; font-size:12px; }
.group.late h3 i { background:var(--red-soft); color:var(--red); }
.cards { display:grid; gap:8px; }

.card { display:flex; gap:12px; align-items:flex-start; background:var(--card); border-radius:14px; padding:12px 14px;
  box-shadow:var(--shadow); transition:opacity .25s, transform .25s; }
.card.leaving { opacity:0; transform:translateX(24px); }
.check { flex:none; width:26px; height:26px; margin-top:1px; border-radius:50%; border:2px solid var(--sub); display:grid; place-items:center; color:transparent; padding:0; }
.card.late .check { border-color:var(--red); }
.check:active { transform:scale(.9); }
.card.done .check { background:var(--green); border-color:var(--green); color:#fff; }
.check svg { width:14px; height:14px; }
.body { flex:1; min-width:0; text-align:left; padding:0; }
.title { display:block; overflow-wrap:anywhere; font-size:16px; }
.card.done .title { color:var(--sub); text-decoration:line-through; }
.note { display:block; color:var(--sub); font-size:13px; margin-top:2px; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.meta { display:flex; flex-wrap:wrap; gap:6px; margin-top:6px; }
.tag { font-size:12px; line-height:1; padding:4px 8px; border-radius:20px; background:var(--accent-soft); color:var(--accent); }
.tag.time { background:var(--line); color:var(--sub); }
.card.late .tag.time { background:var(--red-soft); color:var(--red); }
.tag.ai { background:var(--accent); color:#fff; }

#empty { text-align:center; color:var(--sub); margin-top:72px; }
#empty svg { color:var(--accent); }

#add { position:fixed; inset:auto 0 0 0; z-index:6; padding:10px 14px calc(10px + env(safe-area-inset-bottom));
  background:var(--card); border-top:1px solid var(--line); box-shadow:0 -6px 20px rgba(20,24,40,.06); }
#add > * { max-width:640px; margin-inline:auto; }
.chips { display:flex; gap:8px; align-items:center; overflow-x:auto; padding-bottom:8px; scrollbar-width:none; }
.chips::-webkit-scrollbar { display:none; }
.chips button, .chip-date { flex:none; padding:6px 12px; border-radius:20px; background:var(--bg); border:1px solid var(--line); font-size:14px; position:relative; }
.chips button.on, .chip-date.on { background:var(--accent-soft); border-color:var(--accent); color:var(--accent); }
.chip-date input { position:absolute; inset:0; opacity:0; width:100%; height:100%; }
#picked { flex:none; font-size:13px; color:var(--accent); }
.line { display:flex; gap:10px; }
.line input { flex:1; min-width:0; padding:12px 14px; border:1px solid var(--line); border-radius:12px; background:var(--bg); font-size:16px; }
.line input:focus, dialog :is(input,textarea,select):focus { outline:2px solid var(--accent); outline-offset:-1px; }
.send { width:48px; border-radius:12px; background:var(--accent); color:#fff; display:grid; place-items:center; }

dialog { width:min(94vw,440px); border:0; border-radius:18px; background:var(--card); color:var(--text); padding:18px; box-shadow:0 20px 60px rgba(0,0,0,.35); }
dialog::backdrop { background:rgba(10,12,20,.5); }
dialog h2 { margin:0 0 14px; font-size:18px; }
dialog label { display:grid; gap:4px; margin-bottom:12px; font-size:13px; color:var(--sub); }
dialog :is(input,textarea,select) { width:100%; padding:10px 12px; border:1px solid var(--line); border-radius:10px; background:var(--bg); }
.two { display:grid; grid-template-columns:1.4fr 1fr; gap:10px; }
.grab { display:none; }
.row { display:flex; gap:8px; margin-top:4px; } .row span { flex:1; }
.row button { padding:10px 16px; border-radius:10px; background:var(--line); }
.row .primary { background:var(--accent); color:#fff; }
.row .danger { background:var(--red-soft); color:var(--red); }
@media (max-width:560px) {
  dialog#edit { margin:auto 0 0; width:100%; max-width:none; border-radius:20px 20px 0 0; padding:10px 18px calc(18px + env(safe-area-inset-bottom)); }
  .grab { display:block; width:40px; height:4px; border-radius:2px; background:var(--line); margin:0 auto 12px; }
}
#toast { position:fixed; left:50%; bottom:calc(140px + env(safe-area-inset-bottom)); transform:translateX(-50%); background:#1b1f2a; color:#fff;
  padding:8px 16px; border-radius:20px; font-size:14px; opacity:0; pointer-events:none; transition:opacity .2s; z-index:9; }
#toast.show { opacity:.95; }
@media (prefers-reduced-motion: reduce) { .card, #toast { transition:none; } }