:root {
  --bg: #f4f6fb;
  --surface: #ffffff;
  --surface-2: #f8fafc;
  --ink: #0f172a;
  --muted: #64748b;
  --line: #e5e9f2;
  --brand: #4f46e5;
  --brand-soft: #eceafe;
  --ok: #16a34a;
  --ok-soft: #e8f7ee;
  --warn: #b45309;
  --warn-soft: #fef3e2;
  --danger: #dc2626;
  --shadow: 0 1px 2px rgba(15, 23, 42, .04), 0 8px 24px rgba(15, 23, 42, .06);
  --radius: 16px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1020;
    --surface: #141a2c;
    --surface-2: #1a2135;
    --ink: #e8ecf6;
    --muted: #93a0b8;
    --line: #263048;
    --brand: #8b86ff;
    --brand-soft: #232748;
    --ok: #46d18a;
    --ok-soft: #14301f;
    --warn: #f0b352;
    --warn-soft: #33260f;
    --shadow: 0 1px 2px rgba(0, 0, 0, .35), 0 10px 28px rgba(0, 0, 0, .35);
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
        "Microsoft YaHei", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}

button { font: inherit; color: inherit; cursor: pointer; }
h1, h2, h3 { margin: 0; font-weight: 650; letter-spacing: -.01em; }
p { margin: 0; }

.shell { max-width: 760px; margin: 0 auto; padding: 18px 16px 40px; }

.top { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 4px 2px 14px; }
.brand { display: flex; align-items: center; gap: 10px; min-width: 0; }
.logo {
  width: 38px; height: 38px; border-radius: 12px; flex: none;
  display: grid; place-items: center;
  background: linear-gradient(140deg, var(--brand), #7c74ff);
  color: #fff; font-size: 19px; font-weight: 700;
  box-shadow: 0 6px 16px rgba(79, 70, 229, .28);
}
.brand h1 { font-size: 17px; }
.brand p { font-size: 12.5px; color: var(--muted); }

.icon-btn {
  border: 1px solid var(--line); background: var(--surface); color: var(--muted);
  width: 36px; height: 36px; border-radius: 12px; display: grid; place-items: center;
  font-size: 15px; transition: transform .15s ease, border-color .15s ease;
}
.icon-btn:hover { border-color: var(--brand); color: var(--brand); }
.icon-btn.spin { transform: rotate(180deg); }

.notice {
  border-radius: 12px; padding: 10px 13px; font-size: 13.5px; margin-bottom: 14px;
  background: var(--brand-soft); color: var(--brand); border: 1px solid transparent;
}
.notice.good { background: var(--ok-soft); color: var(--ok); }
.notice.error { background: var(--warn-soft); color: var(--warn); }

.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 14px; }
.stat {
  background: var(--surface); border: 1px solid var(--line); border-radius: 14px;
  padding: 12px 13px; box-shadow: var(--shadow);
}
.stat b { display: block; font-size: 22px; line-height: 1.2; letter-spacing: -.02em; }
.stat span { font-size: 12px; color: var(--muted); }

.compose {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); margin-bottom: 16px; overflow: hidden;
}
.compose > summary {
  list-style: none; cursor: pointer; padding: 14px 16px; font-weight: 600; font-size: 14.5px;
  display: flex; align-items: center; gap: 8px;
}
.compose > summary::-webkit-details-marker { display: none; }
.compose > summary::before {
  content: "+"; width: 22px; height: 22px; border-radius: 8px; background: var(--brand-soft);
  color: var(--brand); display: grid; place-items: center; font-weight: 700; flex: none;
}
.compose[open] > summary::before { content: "−"; }
.compose form { padding: 0 16px 16px; display: grid; gap: 12px; }

label.field { display: grid; gap: 6px; font-size: 12.5px; color: var(--muted); }
input, textarea, select {
  width: 100%; border: 1px solid var(--line); border-radius: 11px; padding: 10px 12px;
  font: inherit; color: var(--ink); background: var(--surface-2); outline: none;
  transition: border-color .15s ease, box-shadow .15s ease;
}
input:focus, textarea:focus, select:focus {
  border-color: var(--brand); box-shadow: 0 0 0 3px var(--brand-soft); background: var(--surface);
}
textarea { resize: vertical; min-height: 62px; }

button.primary {
  border: 0; border-radius: 12px; padding: 11px 16px; font-weight: 600;
  background: linear-gradient(140deg, var(--brand), #6f68ff); color: #fff;
  box-shadow: 0 8px 18px rgba(79, 70, 229, .26);
  transition: transform .12s ease, opacity .12s ease;
}
button.primary:hover { transform: translateY(-1px); }
button.primary:disabled { opacity: .55; transform: none; cursor: default; }

button.ghost {
  border: 1px solid var(--line); background: var(--surface); border-radius: 10px;
  padding: 7px 12px; font-size: 13px; color: var(--muted);
}
button.ghost:hover { border-color: var(--brand); color: var(--brand); }
button.link { border: 0; background: none; color: var(--brand); font-size: 13px; padding: 2px 0; }

.board-head { display: flex; align-items: baseline; justify-content: space-between; padding: 2px 2px 10px; }
.board-head h2 { font-size: 14.5px; }
.board-head span { font-size: 12.5px; color: var(--muted); }

.item {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 15px 16px; margin-bottom: 12px;
}
.item-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 10px; }
.item h3 { font-size: 15.5px; }
.item-meta { font-size: 12.5px; color: var(--muted); margin-top: 3px; }
.badge {
  border-radius: 999px; padding: 2px 9px; font-size: 11.5px; font-weight: 600; flex: none;
  background: var(--surface-2); color: var(--muted); border: 1px solid var(--line);
}
.badge.open { background: var(--ok-soft); color: var(--ok); border-color: transparent; }
.badge.closed { background: var(--surface-2); color: var(--muted); }
.badge.expired { background: var(--warn-soft); color: var(--warn); border-color: transparent; }

.progress { height: 7px; border-radius: 999px; background: var(--surface-2); margin: 12px 0 8px; overflow: hidden; }
.progress i { display: block; height: 100%; border-radius: 999px; background: linear-gradient(90deg, #34d399, var(--ok)); transition: width .35s ease; }

.item-count { font-size: 13px; color: var(--muted); }
.item-count b { color: var(--ink); font-size: 15px; }

.people { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.person {
  font-size: 12px; padding: 3px 9px; border-radius: 999px; background: var(--surface-2);
  color: var(--muted); border: 1px solid var(--line);
}
.person.me { background: var(--brand-soft); color: var(--brand); border-color: transparent; }

.item-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 13px; }
.item-actions .grow { flex: 1; }

.detail { margin-top: 13px; padding-top: 13px; border-top: 1px dashed var(--line); }
.tabs { display: flex; gap: 6px; margin-bottom: 10px; }
.tab {
  border: 1px solid var(--line); background: var(--surface-2); color: var(--muted);
  border-radius: 999px; padding: 4px 11px; font-size: 12.5px;
}
.tab.active { background: var(--brand); border-color: var(--brand); color: #fff; }
.roster { display: grid; gap: 8px; }
.member { display: flex; align-items: center; gap: 9px; font-size: 13.5px; }
.avatar {
  width: 28px; height: 28px; border-radius: 10px; flex: none; display: grid; place-items: center;
  background: var(--brand-soft); color: var(--brand); font-size: 12px; font-weight: 600;
}
.member .when { margin-left: auto; font-size: 12px; color: var(--muted); }

.empty { color: var(--muted); font-size: 13.5px; padding: 18px 4px; }
.steps { color: var(--muted); font-size: 13.5px; padding-left: 18px; margin: 10px 0 0; }
.steps li { margin-bottom: 6px; }
.foot { color: var(--muted); font-size: 12px; text-align: center; margin-top: 22px; }

/* 卡片视图（消息内） */
.card-page { padding: 12px; }
.card-page .item { margin: 0; }
.card-title-row { display: flex; align-items: flex-start; gap: 10px; justify-content: space-between; }
.card-note { font-size: 13px; color: var(--muted); margin-top: 6px; }
.card-count { display: flex; align-items: baseline; gap: 6px; margin-top: 12px; }
.card-count b { font-size: 26px; letter-spacing: -.02em; }
.card-count span { font-size: 12.5px; color: var(--muted); }
.card-cta { margin-top: 13px; display: flex; gap: 8px; align-items: center; }
.card-cta .primary { flex: 1; }
.signed-badge {
  flex: 1; text-align: center; border-radius: 12px; padding: 11px 14px; font-weight: 600;
  background: var(--ok-soft); color: var(--ok);
  animation: pop .25s ease;
}
@keyframes pop { from { transform: scale(.96); opacity: .6; } to { transform: scale(1); opacity: 1; } }
.card-foot { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; font-size: 12px; color: var(--muted); margin-top: 12px; }

@media (max-width: 420px) {
  .shell { padding: 14px 12px 32px; }
  .stats { gap: 8px; }
  .stat { padding: 10px 11px; }
  .stat b { font-size: 19px; }
  .item { padding: 13px 13px; }
}