/* ── close：結案的卡片灰掉（顏色換成灰階、字仍清楚）、結案鈕 ── */
.card.is-closed{background:var(--surface-2);box-shadow:none;border-style:dashed}
.card.is-closed .tri-box,.card.is-closed .legs,.card.is-closed .card-todo{filter:grayscale(1);opacity:.75}
.card.is-closed .name{color:var(--ink-2)}
.card-close{margin-left:auto}
.close-btn{color:var(--ink-2)}
.close-btn.is-on{color:var(--people-ink);border-color:var(--people)}