:root {
  --bg:#f4f6fa; --panel:#e9edf3; --card:#ffffff;
  --ink:#16233a; --mut:#64748b;
  --line:#e2e8f0; --acc:#4f46e5; --ring:rgba(79,70,229,.22);
  --shadow:0 1px 2px rgba(16,24,40,.07);
  --radius:12px;
}
* { box-sizing:border-box; }
html { -webkit-text-size-adjust:100%; }
body {
  margin:0; color:var(--ink); min-height:100vh;
  font:14px/1.5 "Inter",-apple-system,"Segoe UI",Roboto,sans-serif;
  background:var(--bg);
}

/* header: light, sticky, calm */
header {
  position:sticky; top:0; z-index:10;
  display:flex; align-items:center; justify-content:space-between;
  gap:12px; flex-wrap:wrap; padding:10px 20px;
  background:rgba(255,255,255,.92); backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.brand { display:flex; align-items:center; gap:10px; }
.logo {
  width:32px; height:32px; display:grid; place-items:center; color:#fff;
  background:var(--acc); border-radius:9px; font-weight:800;
}
h1 { font-size:16px; margin:0; font-weight:700; }
.sub { margin:0; font-size:12px; color:var(--mut); }
.toolbar { display:flex; gap:8px; align-items:center; flex-wrap:wrap; }
input,select,textarea,button { font:inherit; }
.search {
  display:flex; align-items:center; gap:7px;
  background:#f1f5f9; border:1px solid var(--line);
  border-radius:9px; padding:6px 10px; color:var(--mut);
}
.search input { background:transparent; border:0; outline:0; color:var(--ink); width:190px; padding:0; }
#who {
  background:#f1f5f9; color:var(--ink);
  border:1px solid var(--line); border-radius:9px; padding:7px 10px;
}
button {
  border:1px solid var(--line); background:#fff; color:var(--ink);
  border-radius:9px; padding:7px 14px; cursor:pointer; font-weight:600;
}
button:hover { background:#f8fafc; }
button.primary { background:var(--acc); border-color:var(--acc); color:#fff; }
button.primary:hover { filter:brightness(1.08); }
button.ghost { background:#fff; }
button:focus-visible, input:focus-visible, select:focus-visible { outline:2px solid var(--ring); outline-offset:1px; }

/* board */
#board {
  display:grid; grid-auto-flow:column; grid-auto-columns:minmax(260px,300px);
  gap:12px; padding:18px 20px 26px; overflow-x:auto; align-items:start;
  min-height:calc(100vh - 57px);
}
.col {
  background:var(--panel); border:1px solid var(--line);
  border-radius:var(--radius); padding:10px; min-height:140px;
}
.col.over { border-color:var(--acc); box-shadow:0 0 0 3px var(--ring); }
.col-head { display:flex; align-items:center; gap:8px; margin:2px 4px 10px; }
.col-head .dot { width:9px; height:9px; border-radius:50%; flex:none; }
.col[data-status="backlog"] .dot { background:#94a3b8; }
.col[data-status="todo"] .dot { background:#3b82f6; }
.col[data-status="in_progress"] .dot { background:#f59e0b; }
.col[data-status="review"] .dot { background:#8b5cf6; }
.col[data-status="done"] .dot { background:#22c55e; }
.col-head h2 {
  font-size:12px; text-transform:uppercase; letter-spacing:.06em;
  color:var(--mut); margin:0; font-weight:700; flex:1;
}
.count {
  font-size:11.5px; font-weight:700; color:var(--mut); background:#fff;
  border:1px solid var(--line); border-radius:999px; padding:1px 9px;
}
.col-add {
  border:1px solid var(--line); background:#fff; color:var(--mut);
  border-radius:8px; padding:1px 9px; font-size:15px; line-height:1.4;
}
.col-add:hover { color:var(--acc); border-color:var(--acc); background:#fff; }
.empty {
  border:1.5px dashed #cbd5e1; border-radius:10px; color:#94a3b8; font-size:12.5px;
  text-align:center; padding:16px 8px; background:rgba(255,255,255,.6);
}

/* cards */
.card {
  background:var(--card); border:1px solid var(--line); border-radius:10px;
  padding:10px 12px; margin-bottom:10px; box-shadow:var(--shadow); cursor:grab;
}
.card:hover { border-color:#c7d2e5; }
.card:active { cursor:grabbing; }

/* detail overview dialog */
.card { cursor:pointer; }
#viewBody .view-top { display:flex; align-items:center; justify-content:space-between; margin-bottom:6px; }
#viewBody .view-title { margin:0 0 8px; font-size:18px; font-weight:700; }
#viewBody .view-meta { display:flex; gap:14px; flex-wrap:wrap; font-size:12.5px; color:var(--mut); margin-bottom:8px; }
#viewBody .view-meta b { color:var(--ink); }
#viewBody .view-who { display:flex; align-items:center; gap:8px; font-size:13px; font-weight:600; margin-bottom:8px; }
#viewBody .view-tags { display:flex; gap:5px; flex-wrap:wrap; margin:0 0 8px; }
#viewBody .view-tags .tag { font-size:11px; font-weight:600; background:#eef2ff; color:#4f46e5; border-radius:6px; padding:1px 7px; }
#viewBody .view-desc { font-size:13.5px; line-height:1.55; color:#1e293b; white-space:pre-wrap; margin:0 0 8px; }
#viewBody .view-dates { display:flex; gap:14px; flex-wrap:wrap; font-size:11.5px; color:var(--mut); border-top:1px solid var(--line); padding-top:8px; }
.card-top { display:flex; align-items:center; justify-content:space-between; gap:8px; margin-bottom:4px; }
.card-id { font-size:11px; font-weight:700; color:#94a3b8; }
.pri {
  display:inline-flex; align-items:center; gap:5px; font-size:11px; font-weight:700;
  border-radius:999px; padding:2px 9px 2px 7px; text-transform:capitalize;
}
.pri::before { content:""; width:7px; height:7px; border-radius:50%; background:currentColor; }
.pri.low { background:#f1f5f9; color:#64748b; }
.pri.medium { background:#e0eaff; color:#2f54eb; }
.pri.high { background:#ffefd6; color:#b45309; }
.pri.urgent { background:#fee2e2; color:#b91c1c; }
.card h3 { margin:0 0 3px; font-size:13.5px; font-weight:600; }
.card .desc {
  font-size:12.5px; color:#475569; margin:2px 0 6px; white-space:pre-wrap;
  display:-webkit-box; -webkit-line-clamp:2; -webkit-box-orient:vertical; overflow:hidden;
}
.card .tags { display:flex; gap:5px; flex-wrap:wrap; margin:2px 0 8px; }
.card .tag { font-size:11px; font-weight:600; background:#eef2ff; color:#4f46e5; border-radius:6px; padding:1px 7px; }
.card-foot { display:flex; align-items:center; justify-content:space-between; gap:8px; }
.assign-wrap { flex:1; min-width:0; }

/* one-click assignee: whole name row is a button */
.assign {
  display:flex; align-items:center; gap:7px; width:100%;
  border:1px solid transparent; background:transparent; border-radius:8px;
  padding:3px 6px; margin-left:-6px; text-align:left; cursor:pointer;
}
.assign:hover { background:#eef2ff; border-color:#c7d2fe; }
.assign.empty { border-style:dashed; border-color:#cbd5e1; color:#94a3b8; font-weight:600; font-size:12px; }
.assign.empty:hover { color:var(--acc); border-color:var(--acc); background:#eef2ff; }
.avatar {
  width:24px; height:24px; border-radius:50%; display:grid; place-items:center; flex:none;
  font-size:10px; font-weight:800; color:#fff; background:#94a3b8;
}
.person { font-size:12px; font-weight:600; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.person.none { color:#94a3b8; font-weight:500; }
.est {
  font-size:11px; font-weight:700; color:#475569; background:#f1f5f9; flex:none;
  border:1px solid var(--line); border-radius:999px; padding:1px 8px; white-space:nowrap;
}

/* inline assignee editor */
.assign-edit { display:flex; gap:4px; align-items:center; }
.assign-input {
  flex:1; min-width:0; border:1px solid var(--acc); border-radius:8px;
  padding:4px 8px; background:#fff; color:var(--ink);
}
.assign-input:focus { outline:2px solid var(--ring); }
.assign-edit button { padding:3px 9px; border-radius:8px; font-size:12px; }
.assign-save { background:var(--acc); border-color:var(--acc); color:#fff; }
.assign-save:hover { filter:brightness(1.1); background:var(--acc); }

.card .ops { display:flex; gap:6px; margin-top:8px; }
.card .ops button { font-size:12px; font-weight:600; padding:3px 10px; border-radius:8px; color:#475569; }
.card .ops button:hover { background:#eef2ff; color:var(--acc); border-color:#c7d2fe; }
.card .ops [data-act="del"]:hover { background:#fef2f2; color:#b91c1c; border-color:#fecaca; }

/* dialogs */
dialog {
  border:1px solid var(--line); border-radius:14px; padding:22px;
  width:min(540px,92vw); box-shadow:0 24px 60px -20px rgba(16,24,40,.35); color:var(--ink);
}
dialog::backdrop { background:rgba(16,24,40,.45); }
dialog h2 { margin:0 0 4px; font-size:17px; font-weight:700; }
.fld { display:block; margin:10px 0; font-size:12.5px; font-weight:600; color:#334155; }
.fld input, .fld textarea, .fld select, #importForm textarea {
  width:100%; margin-top:4px; border:1px solid var(--line); border-radius:9px;
  padding:8px 10px; background:#f8fafc; color:var(--ink); font-weight:400;
}
.fld input:focus, .fld textarea:focus, .fld select:focus, #importForm textarea:focus {
  outline:2px solid var(--ring); border-color:var(--acc); background:#fff;
}
.row { display:grid; grid-template-columns:1fr 1fr; gap:10px; }
/* assignee quick-pick chips */
.chips { display:flex; gap:6px; flex-wrap:wrap; margin-top:8px; }
.chips:empty { display:none; }
.chip {
  border:1px solid var(--line); background:#fff; border-radius:999px;
  padding:3px 6px 3px 3px; font-size:12px; font-weight:600;
  display:inline-flex; align-items:center; gap:6px; cursor:pointer; color:var(--ink);
}
.chip:hover { border-color:var(--acc); background:#eef2ff; color:var(--acc); }
.chip .avatar { width:20px; height:20px; font-size:9px; }
.chip.clear { color:var(--mut); }
.dlg-actions { display:flex; justify-content:flex-end; gap:8px; margin-top:14px; }
.hint { color:var(--mut); font-size:12.5px; font-weight:400; }
.hint code { background:#eef2ff; color:var(--acc); border-radius:5px; padding:0 5px; }
#impPreview { max-height:230px; overflow:auto; border:1px solid var(--line); border-radius:10px; margin-top:8px; background:#fff; }
#impPreview table { width:100%; border-collapse:collapse; font-size:12.5px; }
#impPreview td, #impPreview th { border-bottom:1px solid var(--line); padding:5px 10px; text-align:left; }
#impPreview th { background:#f8fafc; font-size:11px; text-transform:uppercase; letter-spacing:.05em; color:var(--mut); }
@media (max-width:640px) { .search input { width:120px; } #board { padding:12px; } }