:root {
  --bg: #f6f7f9; --surface: #fff; --col: #eceef2; --text: #1e2330; --muted: #6b7385;
  --line: #dde0e7; --accent: #4f6bed; --danger: #d64545; --shadow: 0 1px 2px rgba(20,25,40,.12);
  --red: #e5484d; --orange: #f08c2e; --yellow: #e5b800; --green: #2ea66a; --blue: #3b82f6; --purple: #8e5cd9;
}
:root[data-theme="dark"] { --bg: #14161c; --surface: #232733; --col: #1b1e27; --text: #e8eaf0; --muted: #98a0b3; --line: #343947; --shadow: none; color-scheme: dark; }
:root[data-theme="light"] { color-scheme: light; }
#btn-theme { padding: 6px 10px; }
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body { background: var(--bg); color: var(--text); font: 14px/1.5 "Noto Sans JP", "Hiragino Sans", "Yu Gothic UI", system-ui, sans-serif; display: flex; flex-direction: column; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; border: 1px solid var(--line); background: var(--surface); border-radius: 6px; padding: 6px 12px; }
button:hover { border-color: var(--accent); }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button.danger { color: var(--danger); }
button.ghost { background: transparent; }

.topbar { display: flex; align-items: center; gap: 16px; padding: 10px 20px; background: var(--surface); border-bottom: 1px solid var(--line); }
.topbar h1 { font-size: 17px; margin: 0; white-space: nowrap; }
.logo { display: inline-grid; place-items: center; width: 24px; height: 24px; border-radius: 6px; background: var(--accent); color: #fff; font-size: 14px; margin-right: 4px; }
#search { flex: 1; max-width: 360px; padding: 6px 12px; border: 1px solid var(--line); border-radius: 20px; background: var(--bg); }
.actions { margin-left: auto; display: flex; gap: 8px; }

.board { flex: 1; display: flex; gap: 14px; padding: 18px 20px; overflow-x: auto; align-items: flex-start; }
.column { flex: 0 0 290px; background: var(--col); border-radius: 10px; display: flex; flex-direction: column; max-height: 100%; }
.col-head { display: flex; align-items: center; gap: 6px; padding: 10px 10px 6px 14px; }
.col-title { flex: 1; font-weight: 700; background: transparent; border: 1px solid transparent; border-radius: 4px; padding: 2px 4px; min-width: 0; }
.col-title:focus { border-color: var(--accent); background: var(--surface); outline: none; }
.count { color: var(--muted); font-size: 12px; }
.icon-btn { border: none; background: transparent; padding: 2px 7px; color: var(--muted); border-radius: 4px; }
.icon-btn:hover { background: var(--line); color: var(--danger); }
.cards { flex: 1; overflow-y: auto; padding: 4px 10px; min-height: 40px; display: flex; flex-direction: column; gap: 8px; }
.cards.over { outline: 2px dashed var(--accent); outline-offset: -4px; border-radius: 8px; }

.card { background: var(--surface); border-radius: 8px; padding: 10px 12px; box-shadow: var(--shadow); border: 1px solid var(--line); cursor: grab; position: relative; }
.card:hover { border-color: var(--accent); }
.card.dragging { opacity: .4; }
.card.done .card-title { text-decoration: line-through; color: var(--muted); }
.card-top { display: flex; gap: 8px; align-items: flex-start; }
.card-top input[type=checkbox] { margin-top: 4px; accent-color: var(--green); }
.card-title { flex: 1; word-break: break-word; }
.card-desc { color: var(--muted); font-size: 12px; margin-top: 4px; white-space: pre-wrap; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.card-meta { display: flex; align-items: center; gap: 8px; margin-top: 8px; font-size: 12px; color: var(--muted); }
.due.overdue { color: var(--danger); font-weight: 600; }
.dot { width: 28px; height: 6px; border-radius: 3px; }
.dot.red { background: var(--red); } .dot.orange { background: var(--orange); } .dot.yellow { background: var(--yellow); }
.dot.green { background: var(--green); } .dot.blue { background: var(--blue); } .dot.purple { background: var(--purple); }
.drop-line { height: 3px; border-radius: 2px; background: var(--accent); flex: none; }

.add-card { margin: 8px 10px 10px; text-align: left; border: none; background: transparent; color: var(--muted); }
.add-card:hover { background: var(--line); }
.quick { margin: 4px 10px 10px; display: flex; flex-direction: column; gap: 6px; }
.quick input { padding: 8px 10px; border: 1px solid var(--accent); border-radius: 6px; background: var(--surface); }
.quick .row { display: flex; gap: 6px; }
.add-col { flex: 0 0 290px; border: 2px dashed var(--line); background: transparent; color: var(--muted); padding: 12px; border-radius: 10px; }
.add-col:hover { border-color: var(--accent); color: var(--accent); }

dialog { border: none; border-radius: 12px; padding: 0; width: min(520px, calc(100vw - 32px)); background: var(--surface); color: var(--text); box-shadow: 0 10px 40px rgba(0,0,0,.3); }
dialog::backdrop { background: rgba(10,12,20,.5); }
dialog form { padding: 20px; display: flex; flex-direction: column; gap: 12px; }
dialog h2 { margin: 0; font-size: 16px; }
dialog label { display: flex; flex-direction: column; gap: 4px; font-size: 12px; color: var(--muted); }
dialog input:not([type=checkbox]), dialog select, dialog textarea { padding: 8px 10px; border: 1px solid var(--line); border-radius: 6px; background: var(--bg); color: var(--text); font-size: 14px; }
dialog .row { display: flex; gap: 12px; } dialog .row label { flex: 1; }
dialog label.check { flex-direction: row; align-items: center; gap: 8px; color: var(--text); font-size: 14px; }
.panel { padding: 20px; display: flex; flex-direction: column; gap: 14px; max-height: 85vh; overflow-y: auto; }
.panel form, .panel section { display: flex; flex-direction: column; gap: 10px; padding: 0; }
.panel section { border-top: 1px solid var(--line); padding-top: 14px; }
dialog h3 { margin: 0; font-size: 14px; }
dialog h4 { margin: 8px 0 0; font-size: 13px; }
.msg { margin: 0; min-height: 1.4em; font-size: 13px; color: var(--green); }
.msg.bad { color: var(--danger); }
.user-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 6px; }
.user-list li { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; padding: 8px 10px; background: var(--bg); border: 1px solid var(--line); border-radius: 8px; }
.user-list .u-info { flex: 1 1 140px; min-width: 0; word-break: break-all; }
.user-list .u-id { color: var(--muted); font-size: 12px; margin-left: 4px; }
.badge { font-size: 11px; background: var(--accent); color: #fff; border-radius: 10px; padding: 1px 8px; margin-left: 6px; }
.user-list button { padding: 3px 8px; font-size: 12px; }
.who { color: var(--muted); align-self: center; font-size: 13px; }
.err { color: var(--danger); margin: 0; min-height: 1.5em; font-size: 13px; }
.dlg-actions { display: flex; gap: 8px; align-items: center; margin-top: 4px; }
.spacer { flex: 1; }

@media (max-width: 640px) {
  .topbar { flex-wrap: wrap; gap: 8px; padding: 10px 16px; }
  #search { order: 3; flex-basis: 100%; max-width: none; }
  .board { padding: 14px 16px; }
  .column, .add-col { flex-basis: 82vw; }
}