:root{
  --bg: #f8fafc; --panel:#fff; --muted:#6b7280; --text:#111827;
  --accent:#10b981; --accent-2:#2563eb; --danger:#dc2626;
  --shadow: 0 10px 25px rgba(0,0,0,.12); --radius:16px;
}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;background:linear-gradient(180deg,#f8fafc 0%, #eef2f7 100%);
  font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,"Helvetica Neue",Arial; color:var(--text)}
.app{display:flex;flex-direction:column;height:100%}
header{position:sticky;top:0;z-index:10;display:flex;gap:.75rem;align-items:center;padding:.85rem 1rem;backdrop-filter:saturate(1.2) blur(8px);background:linear-gradient(180deg, rgba(255,255,255,.95), rgba(255,255,255,.7));border-bottom:1px solid rgba(0,0,0,.08)}
header h1{font-size:1.05rem;font-weight:700;margin:0;letter-spacing:.2px}
header .spacer{flex:1}
.btn{appearance:none;border:none;border-radius:12px;padding:.6rem .8rem;background:#eef2f7;color:var(--text);cursor:pointer;box-shadow:var(--shadow);transition:transform .08s ease, background .2s;display:inline-flex;align-items:center;gap:.5rem;font-weight:600}
.btn:hover{transform:translateY(-1px);background:#e5e7eb}
.btn.primary{background:linear-gradient(180deg,#1f6feb,#2563eb)}
.btn.success{background:linear-gradient(180deg,#22c55e,#16a34a)}
.btn.danger{background:linear-gradient(180deg,#ef4444,#dc2626)}
.toolbar{display:flex;gap:.5rem;flex-wrap:wrap}
.toolbar input[type="text"], .toolbar select{background:#fff;color:var(--text);border:1px solid rgba(0,0,0,.08);border-radius:12px;padding:.6rem .75rem;min-width:220px;box-shadow:var(--shadow)}
main{flex:1;overflow:auto;padding:1rem}
.board{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1rem;align-items:start}
.column{background:linear-gradient(180deg,#fff,#f8fafc);border:1px solid rgba(0,0,0,.08);border-radius:var(--radius);padding:.75rem;box-shadow:var(--shadow);min-height:120px}
.column header{position:relative;inset:auto;background:transparent;border:none;padding:0;margin:0 0 .5rem 0;display:flex;align-items:center;gap:.5rem}
.column h2{font-size:.95rem;margin:0;font-weight:700}
.column .count{opacity:.7;font-weight:600}
.column .col-actions{margin-left:auto;display:flex;gap:.35rem}
.column .col-actions .icon{opacity:.8;cursor:pointer;padding:.2rem .35rem;border-radius:8px}
.column .col-actions .icon:hover{background:rgba(0,0,0,.06)}
.dropzone{display:flex;flex-direction:column;gap:.6rem;min-height:40px}
.card{background:#fff;border:1px solid rgba(0,0,0,.08);border-radius:12px;padding:.7rem .7rem .6rem;box-shadow:var(--shadow);cursor:grab}
.card.dragging{opacity:.65}
.card-header{display:flex;align-items:flex-start;gap:.5rem}
.card h3{font-size:.95rem;margin:.1rem 0 .35rem;font-weight:700;flex:1}
.card-actions{display:flex;align-items:center;gap:.35rem}
.card-action-btn{appearance:none;border:none;background:transparent;cursor:pointer;font-size:1rem;line-height:1;padding:.1rem;border-radius:8px;opacity:.7;transition:background .2s ease, opacity .2s ease}
.card-action-btn:hover{background:rgba(0,0,0,.05);opacity:1}
.link{color:var(--accent-2);text-decoration:none}
.muted{color:var(--muted)}
.empty{opacity:.7;border:1px dashed rgba(0,0,0,.12);border-radius:12px;padding:1rem;text-align:center}
footer{padding:.8rem 1rem;display:flex;gap:.5rem;align-items:center;justify-content:space-between;border-top:1px solid rgba(0,0,0,.08);background:#fff}
footer .left, footer .right{display:flex;gap:.5rem;align-items:center;flex-wrap:wrap}
.kbd{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace;background:#f3f4f6;border:1px solid rgba(0,0,0,.12);padding:.1rem .35rem;border-radius:6px}
.modal-body{padding:1rem;display:grid;gap:.75rem}
.modal-actions{display:flex;gap:.5rem;justify-content:flex-end;padding:0 1rem 1rem}


/* Visual state for active dropzone (replaces inline style to satisfy CSP) */
.dropzone--active {
  outline: 2px dashed rgba(96,165,250,.6);
  border-radius: 12px;
}

/* Column background selector */
.column-bg-picker{margin-left:.35rem;display:flex;align-items:center}
.column-bg-select{appearance:none;border:1px solid rgba(0,0,0,.12);border-radius:8px;background:rgba(255,255,255,.85);padding:.2rem .4rem;font-size:.75rem;cursor:pointer;box-shadow:none;transition:border-color .2s ease, box-shadow .2s ease}
.column-bg-select:focus{outline:2px solid rgba(37,99,235,.35);outline-offset:1px;box-shadow:0 0 0 2px rgba(37,99,235,.15)}

/* Column background themes */
.column-bg-default{background:linear-gradient(180deg,#fff,#f8fafc)}
.column-bg-sunrise{background:linear-gradient(180deg,#fef3c7,#fde68a)}
.column-bg-forest{background:linear-gradient(180deg,#dcfce7,#bbf7d0)}
.column-bg-ocean{background:linear-gradient(180deg,#e0f2fe,#bae6fd)}
.column-bg-lavender{background:linear-gradient(180deg,#ede9fe,#ddd6fe)}