.card{background:#fff;border-radius:5px;padding:8px 10px;margin-bottom:6px;box-shadow:0 1px 2px #0000001a;cursor:grab;border-left:3px solid #0078d4}.card:active{cursor:grabbing}.card-subject{font-weight:600;font-size:12px;margin:0 0 3px;color:#1a1a1a;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.card-sender{font-size:11px;color:#555;margin:0 0 2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.card-date{font-size:10px;color:#999;margin:0}.column{background:#f4f5f7;border-radius:6px;min-width:180px;flex:1;display:flex;flex-direction:column}.column-header{padding:8px 10px 6px;display:flex;justify-content:space-between;align-items:center;background:#fff;border-radius:6px 6px 0 0}.column-title{font-weight:700;font-size:11px;text-transform:uppercase;letter-spacing:.5px;color:#333}.column-count{background:#e0e0e0;border-radius:8px;padding:1px 6px;font-size:11px;color:#555}.column-body{padding:8px;flex:1;min-height:60px;transition:background .2s}.column-body.over{background:#e3f2fd}.board{display:flex;gap:10px;padding:10px;overflow-x:auto;align-items:flex-start;height:calc(100vh - 52px)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Segoe UI,Tahoma,sans-serif;background:#eef0f3;overflow:hidden}.app{display:flex;flex-direction:column;height:100vh}.app-header{height:42px;background:#0078d4;color:#fff;display:flex;align-items:center;justify-content:space-between;padding:0 14px;flex-shrink:0}.app-title{font-size:14px;font-weight:700}.btn-refresh{background:#fff3;border:none;color:#fff;width:28px;height:28px;border-radius:4px;cursor:pointer;font-size:16px;display:flex;align-items:center;justify-content:center}.btn-refresh:hover{background:#ffffff59}.status{padding:16px;color:#555;font-size:13px}.status.error{color:#c00}