:root {
  --bg: #ffffff;
  --surface: #f6f8fc;
  --card: #ffffff;
  --ink: #19233a;
  --muted: #707a8c;
  --hint: #969eac;
  --blue: #2f6fed;
  --blue-soft: #edf3ff;
  --divider: #e0e6f0;
  --green: #279452;
  --green-soft: #e8f7ee;
  --amber: #c17808;
  --amber-soft: #fff5e1;
  --overdue: #8c95a4;
  --overdue-soft: #f5f6f9;
  --red: #d44b4b;
  --shadow: 0 1px 3px rgba(20, 28, 50, .06);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1218;
    --surface: #161a22;
    --card: #1c202a;
    --ink: #e8ecf4;
    --muted: #8c96a8;
    --hint: #6e7888;
    --blue: #70a8ff;
    --blue-soft: #1e2a40;
    --divider: #2c3242;
    --green: #6cc88e;
    --green-soft: #1a2620;
    --amber: #e8b24e;
    --amber-soft: #2e2616;
    --overdue: #7d8694;
    --overdue-soft: #1f2330;
    --red: #ef6363;
    --shadow: 0 1px 3px rgba(0, 0, 0, .35);
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 14px/1.5 -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
        "Helvetica Neue", Helvetica, Arial, sans-serif;
}

button, input, textarea, select {
  font: inherit;
  color: inherit;
}

.hidden { display: none !important; }

/* --- top bar ---------------------------------------------------------- */
.topbar {
  position: sticky; top: 0; z-index: 5;
  display: flex; align-items: center; gap: 14px;
  padding: 10px 18px;
  background: var(--bg);
  border-bottom: 1px solid var(--divider);
}
.brand { display: flex; align-items: center; gap: 12px; flex: 1; }
.brand-mark {
  width: 30px; height: 30px; border-radius: 8px;
  background: var(--blue); color: white;
  display: grid; place-items: center; font-weight: 700;
}
.brand-title { font-weight: 700; font-size: 15px; }
.brand-sub { color: var(--muted); font-size: 11px; }
.topbar-actions { display: flex; gap: 6px; }

.ghost {
  background: var(--blue-soft); color: var(--blue);
  border: 0; border-radius: 14px; padding: 6px 12px;
  cursor: pointer; font-weight: 600;
}
.ghost:hover { filter: brightness(.95); }

/* --- layout ----------------------------------------------------------- */
.layout {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: 14px;
  padding: 14px 18px 24px;
  max-width: 1200px;
  margin: 0 auto;
  min-height: calc(100vh - 72px);
}
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
}
.pane {
  display: flex; flex-direction: column;
  background: var(--surface);
  border-radius: 14px;
  padding: 12px;
  min-height: 0;
}
.chat { min-height: 480px; }

.pane-tabs {
  display: flex; align-items: center; gap: 6px;
  padding-bottom: 10px;
}
.tab {
  border: 0; background: transparent;
  color: var(--muted); padding: 6px 12px; border-radius: 12px;
  cursor: pointer; font-weight: 600;
}
.tab.active { color: var(--blue); background: var(--blue-soft); }
.tab.static { cursor: default; }
.add {
  margin-left: auto;
  border: 0; background: var(--blue); color: #fff;
  border-radius: 12px; padding: 6px 12px; cursor: pointer; font-weight: 600;
}

.task-summary { color: var(--muted); font-size: 12px; padding: 0 4px 10px; }
.task-list { display: flex; flex-direction: column; gap: 8px; overflow: auto; }

.task {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 12px;
  padding: 12px;
  background: var(--card);
  border: 1px solid var(--divider);
  border-radius: 12px;
  box-shadow: var(--shadow);
}
.task.completed { background: var(--green-soft); border-color: color-mix(in srgb, var(--green) 35%, transparent); }
.task.overdue   { background: var(--overdue-soft); border-color: color-mix(in srgb, var(--overdue) 30%, transparent); }
.task.longterm  { background: var(--amber-soft); border-color: color-mix(in srgb, var(--amber) 40%, transparent); }
.task .check {
  width: 26px; height: 26px; border-radius: 50%;
  border: 2px solid var(--blue); background: transparent;
  cursor: pointer; padding: 0; display: grid; place-items: center;
  color: var(--blue); font-weight: 700;
}
.task.completed .check { background: var(--green); border-color: var(--green); color: #fff; }
.task.overdue   .check { border-color: var(--overdue); color: var(--overdue); }
.task.longterm  .check { border-color: var(--amber); color: var(--amber); }
.task .info { min-width: 0; cursor: pointer; }
.task .time {
  display: inline-block; font-weight: 700; font-size: 12px;
  padding: 2px 8px; border-radius: 8px;
  background: color-mix(in srgb, var(--blue) 15%, transparent); color: var(--blue);
}
.task.completed .time { background: color-mix(in srgb, var(--green) 18%, transparent); color: var(--green); }
.task.overdue   .time { background: color-mix(in srgb, var(--overdue) 20%, transparent); color: var(--overdue); }
.task.longterm  .time { background: color-mix(in srgb, var(--amber) 18%, transparent); color: var(--amber); }
.task .title { font-weight: 700; font-size: 15px; margin-top: 4px; word-break: break-word; }
.task.completed .title { color: var(--muted); text-decoration: line-through; }
.task .badges { margin-top: 4px; font-size: 11px; color: var(--blue); }
.task .details {
  margin-top: 6px; font-size: 12px; color: var(--muted);
  white-space: pre-wrap; word-break: break-word;
}
.task .progress {
  height: 3px; border-radius: 2px; background: var(--divider);
  margin-top: 6px; overflow: hidden;
}
.task .progress > div { height: 100%; background: var(--amber); }
.task .progress.urgent > div { background: var(--red); }

.empty {
  text-align: center; padding: 40px 12px;
  color: var(--muted);
}
.empty-icon { font-size: 36px; }

/* --- chat ------------------------------------------------------------- */
.messages {
  flex: 1; min-height: 0; overflow: auto;
  display: flex; flex-direction: column; gap: 10px;
  padding: 4px;
}
.bubble-row { display: flex; flex-direction: column; max-width: 92%; }
.bubble-row.user { align-self: flex-end; align-items: flex-end; }
.bubble-row.assistant { align-self: flex-start; align-items: flex-start; }
.bubble {
  padding: 10px 14px; border-radius: 14px;
  white-space: pre-wrap; word-break: break-word;
}
.bubble-row.user .bubble {
  background: color-mix(in srgb, var(--blue) 22%, transparent); color: var(--ink);
}
.bubble-row.assistant .bubble {
  background: var(--card); color: var(--ink);
  border: 1px solid var(--divider);
}
.bubble-meta { font-size: 11px; color: var(--muted); margin-top: 4px; }
.bubble-meta .retry {
  color: var(--blue); cursor: pointer; margin-left: 8px;
  background: transparent; border: 0; font-weight: 600;
}

.composer {
  display: flex; gap: 8px; align-items: flex-end;
  padding-top: 10px;
  border-top: 1px solid var(--divider);
}
.composer textarea {
  flex: 1;
  border: 1px solid var(--divider); border-radius: 18px;
  background: var(--card); color: var(--ink);
  padding: 9px 14px; resize: none; max-height: 120px;
  font-size: 14px;
}
.composer button {
  width: 42px; height: 42px; border-radius: 50%;
  background: var(--blue); color: #fff; border: 0;
  font-size: 18px; cursor: pointer;
}
.composer button:disabled { background: color-mix(in srgb, var(--blue) 45%, transparent); }

/* --- modals / login --------------------------------------------------- */
.modal, .login {
  position: fixed; inset: 0;
  background: rgba(15, 18, 24, .55);
  display: grid; place-items: center;
  z-index: 10; padding: 16px;
}
.modal-card, .login-card {
  background: var(--bg);
  border-radius: 16px;
  padding: 18px 18px 12px;
  width: min(420px, 100%);
  box-shadow: 0 10px 40px rgba(0, 0, 0, .25);
}
.login-card h1 { margin: 0 0 6px; font-size: 18px; }
.login-card p { margin: 0 0 12px; color: var(--muted); font-size: 13px; }
.login-card input {
  width: 100%; padding: 10px 12px;
  border-radius: 10px; border: 1px solid var(--divider);
  background: var(--card); color: var(--ink); font-size: 14px;
}
.login-card button {
  margin-top: 12px; width: 100%;
  background: var(--blue); color: #fff; border: 0;
  padding: 10px; border-radius: 12px; font-weight: 700; cursor: pointer;
}
.login-hint { color: var(--red); }

.modal-card h2 { margin: 0 0 12px; font-size: 16px; }
.modal-card label {
  display: block; margin-bottom: 10px;
  font-size: 12px; color: var(--muted);
}
.modal-card label input,
.modal-card label textarea {
  display: block; margin-top: 4px; width: 100%;
  border: 1px solid var(--divider); border-radius: 10px;
  background: var(--card); color: var(--ink);
  padding: 8px 10px; font-size: 14px;
}
.modal-card textarea { resize: vertical; }
.modal-card fieldset { border: 0; padding: 0; margin: 0 0 12px; }
.modal-card legend { color: var(--muted); font-size: 12px; padding: 0 0 6px; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chips label {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 4px 10px; border-radius: 14px;
  background: var(--surface); cursor: pointer; font-size: 12px; color: var(--ink);
}
.chips input { margin: 0; }
.modal-actions {
  display: flex; align-items: center; gap: 8px; margin-top: 8px;
}
.modal-actions .spacer { flex: 1; }
.modal-actions button {
  border: 0; padding: 8px 14px; border-radius: 12px;
  cursor: pointer; font-weight: 700;
}
.modal-actions .primary { background: var(--blue); color: #fff; }
.modal-actions .danger { background: transparent; color: var(--red); }
.modal-actions .ghost { background: var(--blue-soft); color: var(--blue); }

/* --- linkified detail tokens ---------------------------------------- */
.token {
  color: var(--blue); text-decoration: underline; cursor: pointer;
}

/* --- notification banner ---------------------------------------------- */
.notif-status {
  font-size: 11px; margin-left: 6px; color: var(--muted);
}